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UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
Form 10-K
þxANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
 For the fiscal year ended December 31, 20142016
or
¨oTRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
Commission file number: 0-19311
BIOGEN IDEC INC.
(Exact name of registrant as specified in its charter)
Delaware 33-0112644
(State or other jurisdiction of
incorporation or organization)
 
(I.R.S. Employer
Identification No.)
225 Binney Street, Cambridge, Massachusetts 02142
(617) 679-2000
(Address, including zip code, and telephone number, including area code, of Registrant’s principal executive offices)
Securities registered pursuant to Section 12(b) of the Act:
Title of Each Class Name of Each Exchange on Which Registered
Common Stock, $0.0005 par value The Nasdaq Global Select Market
Securities registered pursuant to Section 12(g) of the Act:
None
Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes þx        No ¨o
Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act.    Yes ¨o        No þx
Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes þx       No ¨o
Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files):    Yes þx        No ¨o
Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of the registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.    þx
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.
Large accelerated filer þx
 
Accelerated filer ¨o 
 
Non-accelerated filer ¨o
 
Smaller reporting company ¨o
    (Do not check if a smaller reporting company)  
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).    Yes ¨o        No þx
The aggregate market value of the registrant’s common stock held by non-affiliates of the registrant (without admitting that any person whose shares are not included in such calculation is an affiliate) computed by reference to the price at which the common stock was last sold as of the last business day of the registrant’s most recently completed second fiscal quarter was $74,386,280,444.$52,843,669,823.
As of January 30, 2015,27, 2017, the registrant had 234,614,474215,951,945 shares of common stock, $0.0005 par value, outstanding.
DOCUMENTS INCORPORATED BY REFERENCE
Portions of the definitive proxy statement for our 20152017 Annual Meeting of Stockholders are incorporated by reference into Part III of this report.
 


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BIOGEN IDEC INC.
ANNUAL REPORT ON FORM 10-K
For the Year Ended December 31, 20142016
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NOTE REGARDING FORWARD-LOOKING STATEMENTS
This report contains forward-looking statements that are being made pursuant to the provisions of the Private Securities Litigation Reform Act of 1995 (the “Act”)Act) with the intention of obtaining the benefits of the “Safe Harbor” provisions of the Act. These forward-looking statements may be accompanied by such words as “anticipate,” “believe,” “could,” “estimate,” “expect,” “forecast,” “intend,” “may,” “plan,” “potential,” “project,” “target,” “will” and other words and terms of similar meaning. Reference is made in particular to forward-looking statements regarding:
the anticipated amount, timing and accounting of revenues, contingent payments, milestone, royalty and other payments under licensing, collaboration or acquisition agreements, tax positions and contingencies, collectability of receivables, pre-approval inventory, cost of sales, research and development costs, compensation and other selling, general and administrative expenses, amortization of intangible assets, foreign currency exchange risk, estimated fair value of assets and liabilities, and impairment assessments;
expectations, plans and prospects relating to sales, pricing, growth and launch of our marketed and pipeline products;
the potential impact of increased product competition in the multiple sclerosis (MS),markets in which we compete;
the spin off of our hemophilia business, including its anticipated benefits, costs and oncology markets;tax treatment;
the anticipated amount and timing of payments under the Settlement and License Agreement with Forward Pharma A/S (Forward Pharma) and the timing, outcome and impact of administrative, regulatory, legal and other proceedings related to our patents and other proprietary intellectual property rights under our agreement with Forward Pharma;
patent terms, patent term extensions, patent office actions and expected availability and period of regulatory exclusivity;
the costs and timing of potential clinical trials, filing and approvals, and the potential therapeutic scope of the development and commercialization of our and our collaborators’ pipeline products;
the drivers for growing our business, including our plans and intent to commit resources relating to business development opportunities and research and development programs;
potential costs and expenses incurred in connection with corporate restructurings and to execute business transformation and optimization initiatives;
our manufacturing capacity, use of third-party contract manufacturing organizations and plans and timing relating to the expansion of our manufacturing capabilities, including anticipated investments and activities in new manufacturing facilities;
the expected financial impact of ceasing manufacturing activities and vacating our biologics manufacturing facility in Cambridge, MA and warehouse space in Somerville, MA;
the potential impact on our results of operations and liquidity of the United Kingdom's (U.K.'s) intent to voluntarily depart from the European Union (E.U.);
the impact of the continued uncertainty of the credit and economic conditions in certain countries in Europe and our collection of accounts receivable in such countries;
the potential impact of healthcare reform in the United States (U.S.) and measures being taken worldwide designed to reduce healthcare costs to constrain the overall level of government expenditures, including the impact of pricing actions and reduced reimbursement for our products;
the timing, outcome and impact of administrative, regulatory, legal and other proceedings related to patents and other proprietary and intellectual property rights, tax audits, assessments and settlements, pricing matters, sales and promotional practices, product liability and other matters;
patent terms, patent term extensions, patent office actions, and expected availability and period of regulatory exclusivity;
the costs, timing, potential approval and therapeutic scope of the development and commercialization of our pipeline products and the expected timing of related filings and regulatory actions;
our intent to commit resources for research and development opportunities;
our manufacturing capacity and use of third party contract manufacturing organizations to provide manufacturing services;
the drivers for growing our business, including our plans to pursue business development and research opportunities;
the potential impact of healthcare reform in the U.S., implementation of provisions of the Patient Protection and Affordable Care Act (also known as the Affordable Care Act or PPACA), and measures being taken worldwide designed to reduce healthcare costs to constrain the overall level of government expenditures, including the impact of pricing actions in Europe and elsewhere, and reduced reimbursement for our products;
lease commitments, purchase obligations and the timing and satisfaction of other contractual obligations;
the impact of the continued uncertainty and deterioration of the credit and economic conditions in certain countries in Europe and our collection of accounts receivable in such countries;
our ability to finance our operations and business initiatives and obtain funding for such activities; and
the impact of new laws and accounting standards.


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These forward-looking statements involve risks and uncertainties, including those that are described in the “Risk Factors” section of this report and elsewhere withinin this report, that could cause actual results to differ materially from those reflected in such statements. You should not place undue reliance on these statements. Forward-looking statements speak only as of the date of this report. WeExcept as required by law, we do not undertake any obligation to publicly update any forward-looking statements.statements, whether as a result of new information, future developments or otherwise.
NOTE REGARDING COMPANY AND PRODUCT REFERENCES
ThroughoutReferences in this report “Biogen Idec,to:
“Biogen,” the “Company,“company,” “we,” “us” and “our” refer to Biogen Idec Inc. and its consolidated subsidiaries. References to “RITUXAN” refersubsidiaries;
“RITUXAN” refers to both RITUXAN (the trade name for rituximab in the U.S., Canada and Japan) and MabThera (the trade name for rituximab outside the U.S., Canada and Japan);
"ELOCTATE" refers to both ELOCTATE (the trade name for Antihemophilic Factor (Recombinant), Fc Fusion Protein in the U.S., Canada and “ANGIOMAX”Japan) and ELOCTA (the trade name for Antihemophilic Factor (Recombinant), Fc Fusion Protein in the E.U.); and
“ANGIOMAX” refers to both ANGIOMAX (the trade name for bivalirudin in the U.S., Canada and Latin America) and ANGIOX (the trade name for bivalirudin in Europe).
NOTE REGARDING TRADEMARKS
AVONEX®, BENEPALI®, FLIXABI®, PLEGRIDY®, RITUXAN®, TECFIDERA®, TYSABRI® and ZINBRYTA® are registered trademarks of Biogen. FUMADERMTM and SPINRAZATM are trademarks of Biogen. ALPROLIX®, ELOCTATE®, ENBREL®, FAMPYRATM, GAZYVA®, HUMIRA®, OCREVUS®, REMICADE® and other trademarks referenced in this report are the property of their respective owners.



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NOTE REGARDING TRADEMARKS
ALPROLIX®,AVONEX®, ELOCTATE®, RITUXAN®, TECFIDERA®, and TYSABRI® are registered trademarks of Biogen Idec. ELOCTATM, FUMADERMTM, PLEGRIDYTM and ZINBRYTATM are trademarks of Biogen Idec. The following are trademarks of the respective companies listed: ACTEMRA® - Chugai Seiyaku Kabushiki Kaisha; ADVATE® - Baxter International Inc.;ANGIOMAX® and ANGIOXTM - The Medicines Company; ARZERRA® - Glaxo Group Limited; BENLYSTA® - GlaxoSmithKline Intellectual Property Limited; AUBAGIO® - Sanofi Societe Anonyme France; BENEFIX® - Genetics Institute LLC; BETASERON®- Bayer Pharma AG; CIMZIA® - UCB Pharma, S.A.; COPAXONE® - Teva Pharmaceutical Industries Limited; ENBREL® - Immunex Corporation; EXTAVIA® and GILENYA® - Novartis AG; FAMPYRATM - Acorda Therapeutics, Inc.; GAZYVA® -  Genentech, Inc.; HELIXATE® - CSL Behring LLC; HUMIRA® - AbbVie Biotechnology Ltd.; IMBRUVICA® - Pharmacyclics, Inc.; KOGENATE® - Bayer AG; LEMTRADA® - Genzyme Corporation; ORENCIA® - Bristol-Myers Squibb Company; REBIF® - Ares Trading S.A.; REMICADE® - Janssen Biotech, Inc.; RIXUBIS - Baxter International Inc.; SIMPONI® and SIMPONI ARIATM - Johnson & Johnson; TREANDA® - Cephalon, Inc.; XELJANZ® - Pfizer Inc.; XYNTHA® - Wyeth LLC; and ZYDELIG® - Gilead Sciences.

4


PART I
Item 1.Business
Item 1.     Business
Overview
Biogen Idec is a global biopharmaceutical company focused on discovering, developing, manufacturing and delivering therapies forto people living with serious neurological, rare and autoimmune and hematologic disorders. diseases.
Our principal marketed products include TECFIDERA, AVONEX, PLEGRIDY, TECFIDERA, TYSABRI, ZINBRYTA and FAMPYRA for multiple sclerosis (MS), ALPROLIXFUMADERM for hemophilia Bthe treatment of severe plaque psoriasis and ELOCTATESPINRAZA for hemophilia A.the treatment of spinal muscular atrophy (SMA). We also collaborate on the developmenthave certain business and commercialization offinancial rights with respect to RITUXAN for the treatment of non-Hodgkin's lymphoma, chronic lymphocytic leukemia (CLL) and other conditions, and share profits and losses for GAZYVA which is approvedindicated for the treatment of chronic lymphocytic leukemia.CLL and follicular lymphoma and other potential anti-CD20 therapies under a collaboration agreement with Genentech, Inc. (Genentech), a wholly-owned member of the Roche Group (Roche Group).
We are focused on discovering and developing new therapies that improve the lives of patients having diseases with high unmet medical needs. We support our missiondrug discovery and development efforts through the commitment of significant resources to discovery, research and development programs and business development opportunities, particularly within areas of our scientific, manufacturing and technical expertise - neurology, immunology and hematology, and scientific adjacencies.
We were formed as a corporationcapabilities. For nearly two decades we have led in the Stateresearch and development of Californianew therapies to treat MS, resulting in 1985our leading portfolio of MS treatments. Now our research is focused on additional improvements in the treatment of MS, such as the development of next generation therapies for MS, with a goal to reverse or possibly repair damage caused by the disease. We are also applying our scientific expertise to solve some of the most challenging and complex diseases, including Alzheimer's disease, Parkinson's disease and amyotrophic lateral sclerosis (ALS), and are employing innovative technologies to discover potential treatments for rare and genetic disorders, including new ways of treating diseases through gene therapy.
Our innovative drug development and commercialization activities are complemented by our biosimilar therapies that expand access to medicines and reduce the cost burden for healthcare systems. We are leveraging our manufacturing capabilities and know-how to develop, manufacture and market biosimilars through Samsung Bioepis, our joint venture with Samsung BioLogics Co. Ltd. (Samsung Biologics). Under this agreement, we are currently manufacturing and commercializing two anti-tumor necrosis factor (TNF) biosimilars in certain European Union (E.U.) countries.


Key Developments
During 2016 we had a number of key developments affecting our business.
Corporate Matters
Hemophilia Spin-Off
In May 2016 we announced our intention to spin off our hemophilia business, Bioverativ Inc. (Bioverativ), as an independent, publicly traded company. Bioverativ will focus on the discovery, development and commercialization of therapies for treatment of hemophilia and other blood disorders, including ELOCTATE for the treatment of hemophilia A and ALPROLIX for the treatment of hemophilia B. Bioverativ will also assume all of our rights and obligations under our collaboration agreement with Swedish Orphan Biovitrum AB (Sobi) and our collaboration and license agreement with Sangamo Biosciences Inc. (Sangamo).
On February 1, 2017, we completed the distribution of all the then outstanding shares of common stock of Bioverativ to Biogen stockholders, who received one share of Bioverativ common stock for every two shares of Biogen common stock. As a result of the distribution, Bioverativ is now an independent public company whose shares of common stock are trading under the name IDEC Pharmaceuticals Corporationsymbol "BIVV" on the Nasdaq Global Select Market.
The financial results of Bioverativ are included in our consolidated results of operations and reincorporatedfinancial position in our audited consolidated financial statements for the periods presented in this Form 10-K. The financial results of Bioverativ will be excluded from our consolidated results of operations and financial position commencing February 1, 2017. For additional information regarding the separation of Bioverativ, please read Note 26, Subsequent Events to our consolidated financial statements included in this report.
Management Changes
During 2016 we appointed several new executives, each of whom has significant experience in the biopharmaceutical industry and is a leader in his or her functional area. These include Michel Vounatsos, Chief Executive Officer, Michael D. Ehlers, Executive Vice President, Research and Development and Paul McKenzie, Executive Vice President, Pharmaceutical Operations and Technology. For additional information related to these and our other Executive Officers, please read "Our Executive Officers" included in this report.
Cost Saving Initiatives
In 2016 we initiated cost saving measures intended to realign our organizational structure in anticipation of the changes in roles and workforce resulting from our decision to spin off our hemophilia business, as well as to achieve further targeted cost reductions.
In December 2016 after an evaluation of our manufacturing capacity and needs, we ceased manufacturing at our Cambridge, MA manufacturing facility and subleased our rights to this facility to Brammer Bio MA, LLC (Brammer). In addition to the sublease, Brammer purchased certain leasehold improvements and other assets at this facility and agreed to provide certain manufacturing and other transition and support services to us.
TECFIDERA Settlement and License Agreement
In January 2017 we agreed to enter into a Delaware corporationsettlement and license agreement with Forward Pharma A/S (Forward Pharma). The settlement and license agreement provides us an irrevocable license to all intellectual property owned by Forward Pharma and results in 1997. In 2003,the termination of the German Infringement Litigation. Under the terms of the settlement and license agreement with Forward Pharma, we acquired Biogen, Inc.agreed to pay Forward Pharma $1.25 billion in cash. During the fourth quarter of 2016 we recognized a pre-tax charge of $454.8 million related to this matter. For more information on the settlement and changedlicense agreement please read Note 21, Commitments and Contingencies to our corporate name to Biogen Idecconsolidated financial statements included in this report.



Product/Pipeline Developments
Multiple Sclerosis
TYSABRI (natalizumab)
lIn June 2016 the European Commission (EC) approved a variation to the marketing authorization of TYSABRI, which extended its indication to include relapsing-remitting MS patients with highly active disease activity despite a full and adequate course of treatment with at least one disease modifying therapy. TYSABRI was previously indicated only for patients who had failed to respond to beta-interferon or glatiramer acetate in the E.U.
ZINBRYTA (daclizumab)
lZINBRYTA was approved for the treatment of relapsing forms of MS in the U.S. in May 2016 and the E.U. in July 2016.
Opicinumab (Anti-LINGO-1)
lIn June 2016 we reported top-line results from SYNERGY, our Phase 2 trial evaluating opicinumab in people with relapsing forms of MS. Opicinumab did not meet the primary endpoint or its secondary efficacy endpoint. However, based on these results, there was a subset of patients within the study that we believe have potential to benefit from treatment, and we are therefore planning another Phase 2 clinical trial related to opicinumab.
Neurodegeneration
Aducanumab (BIIB037)
lIn June 2016 we announced that aducanumab, our investigational treatment for early Alzheimer’s disease, was accepted into the European Medicines Agency's (EMA's) Priority Medicines (PRIME) program. PRIME aims to bring treatments to patients more quickly by enhancing the EMA's support for the development of investigational medicines for diseases without available treatments or in need of better treatment options.
lIn September 2016 aducanumab was granted "Fast Track" designation by the U.S. Food and Drug Administration (FDA). The FDA’s Fast Track program supports the development of new treatments for serious conditions with an unmet medical need such as Alzheimer’s disease.
lIn September 2016 we announced that efficacy and safety data from an additional interim analysis from our Phase 1b study of aducanumab in early Alzheimer's disease were consistent with results previously reported from the Phase 1b study.
lIn December 2016 we presented new data from the Phase 1b study of aducanumab, which included interim results from the titration cohort of the placebo-controlled period of the Phase 1b study as well as data from the first year of the long-term extension. The results supported the ongoing Phase 3 studies of aducanumab for early Alzheimer’s disease.
Rare Diseases
SPINRAZA (nusinersen)
lIn August 2016 we and Ionis Pharmaceuticals, Inc. (Ionis) announced that SPINRAZA met the primary endpoint for the interim analysis of ENDEAR, the Phase 3 trial evaluating SPINRAZA in infantile-onset (consistent with Type 1) SMA. Based on these results, we exercised our option under our collaboration agreement with Ionis to assume development and commercialization of SPINRAZA, and paid Ionis a $75.0 million license fee in connection with our option exercise.
lIn September 2016 we completed the rolling submission of a New Drug Application (NDA) to the FDA for the approval of SPINRAZA, and in October 2016 we filed a marketing authorization application (MAA) with the EMA, which had already granted Accelerated Assessment status to SPINRAZA. These applications have been accepted for review by the applicable regulatory authorities.
lIn October 2016 we dosed our first patient in our infantile-onset SMA Expanded Access Program to provide patient access to SPINRAZA.
lIn November 2016 we and Ionis announced that SPINRAZA met the primary endpoint for the interim analysis of CHERISH, the Phase 3 trial evaluating SPINRAZA in later-onset (consistent with Type 2) SMA. The analysis found that children receiving SPINRAZA experienced a highly statistically significant improvement in motor function compared to those who did not receive treatment. SPINRAZA demonstrated a favorable safety profile in the study.
lIn December 2016 SPINRAZA was approved by the FDA for the treatment of SMA in pediatric and adult patients in the U.S. The FDA also issued us a rare pediatric disease priority review voucher with the approval of SPINRAZA, which confers priority review to a subsequent drug application that would not otherwise qualify for priority review.

Biosimilars (Samsung Bioepis - Biogen's Joint Venture with Samsung Biologics)
BENEPALI
lIn January 2016 the EC approved Samsung Bioepis' MAA for BENEPALI, an etanercept biosimilar referencing ENBREL, for marketing in the E.U. Under our agreement with Samsung Bioepis, we are manufacturing and commercializing BENEPALI in specified E.U. countries.
FLIXABI
lIn May 2016 the EC approved Samsung Bioepis' MAA for FLIXABI, an infliximab biosimilar candidate referencing REMICADE, for marketing in the E.U. Under our agreement with Samsung Bioepis, we are manufacturing and commercializing FLIXABI in specified E.U. countries.
Adalimumab (SB5)
lIn July 2016 the EMA accepted Samsung Bioepis' MAA for SB5, an adalimumab biosimilar candidate referencing HUMIRA.
Genentech Relationships
GAZYVA (obinutuzumab)
lIn February 2016 the Roche Group announced that the FDA approved GAZYVA plus bendamustine chemotherapy followed by GAZYVA alone as a new treatment for people with follicular lymphoma who did not respond to a RITUXAN-containing regiment, or whose follicular lymphoma returned after such treatment.
lIn May 2016 the Roche Group announced positive results from the Phase 3 GALLIUM study, which investigated the efficacy and safety of GAZYVA in combination with chemotherapy followed by maintenance with GAZYVA alone, compared to RITUXAN in combination with chemotherapy followed by maintenance with RITUXAN alone in previously untreated patients with follicular lymphoma. Results from pre-planned interim analysis showed that GAZYVA-based treatment significantly reduced the risk of disease worsening or death compared to RITUXAN-based treatment.
lIn July 2016 the Roche Group announced that the Phase 3 GOYA study evaluating GAZYVA plus CHOP chemotherapy in people with previously untreated diffuse large B-cell lymphoma did not meet its primary endpoint of significantly reducing the risk of disease worsening or death compared to RITUXAN plus CHOP chemotherapy. Adverse events with GAZYVA and RITUXAN were consistent with those seen in previous clinical trials when each was combined with various chemotherapies.
OCREVUS (ocrelizumab)
lIn June 2016 the Roche Group announced that the EMA validated its MAA of OCREVUS for the treatment of relapsing multiple sclerosis (RMS) and primary progressive multiple sclerosis (PPMS) in the E.U. The FDA has also accepted for review the Roche Group's Biologics License Application (BLA) for OCREVUS for the treatment of RMS and PPMS.
RITUXAN (rituximab)
lIn November 2016 Genentech announced the FDA accepted its BLA for a subcutaneous formulation of RITUXAN.
Discontinued Programs
l
During 2016 we discontinued development of amiselimod (MT-1303) under our agreement with Mitsubishi Tanabe Pharma Corporation, and IONIS-DMPKRx under one of our collaboration agreements with Ionis. Additionally, we terminated our collaboration agreements with Rodin Therapeutics, Inc. and Ataxion Inc.

Marketed Products
The following chartsgraphs show our product sales and unconsolidated joint business revenues by principal product and revenues from anti-CD20 therapeutic programs and geography as a percentage of revenue for the years ended December 31, 2014, 20132016, 2015 and 2012.2014.
(1) Interferon includes AVONEX and PLEGRIDY
(2) Other includes ZINBRYTA, FAMPYRA, ELOCTATE, ALPROLIX, ELOCTATEFUMADERM, SPINRAZA, BENEPALI and FUMADERM.FLIXABI

1



Product sales for TECFIDERA, AVONEX TECFIDERA and TYSABRI and unconsolidated joint business revenuesanti-CD20 therapeutic programs for RITUXAN each accounted for more than 10% of our total revenue for the years ended December 31, 20142016, 2015 and 2013, and AVONEX, TYSABRI and RITUXAN each accounted for more than 10% of our total revenue for the year ended December 31, 2012.2014. For additional financial information about our product and other revenues and geographic areas in which we operate, please read Note 25,24, Segment Information to our consolidated financial statements, Item 6. Selected Financial Data and Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations included in this report. A discussion of the risks attendant to our operations is set forth in the “Risk Factors” section of this report.

Multiple Sclerosis (MS) Products
We develop, manufacture and market a number of products designed to treat patients with MS. MS is a progressive neurological disease in which the body loses the ability to transmit messages along nerve cells, leading to a loss of muscle control, paralysis and, in some cases, death. Patients with active relapsing MS experience an uneven pattern of disease progression characterized by periods of stability that are interrupted by flare-ups of the disease after which the patient returns to a new baseline of functioning.
Our MS products and major markets include:
AVONEX (interferon beta-1a), an intramuscular injectable therapy, indicated
ProductIndicationCollaboratorMajor Markets
Relapsing forms of MS in the U.S.

Relapsing-remitting MS (RRMS) in the E.U.
None
U.S.
France
Germany
Italy
Spain
United Kingdom
Relapsing forms of MSNone
U.S.
France
Germany
Italy
Spain
United Kingdom
Relapsing forms of MS in the U.S.

RRMS in the E.U.
None
U.S.
France
Germany
Italy
Spain
United Kingdom
Relapsing forms of MS

Crohn's disease in the U.S.
None
U.S.
France
Germany
Italy
Spain
United Kingdom
Relapsing forms of MSAbbVie Inc. (AbbVie)
U.S.
Germany
Walking ability for patients with MSAcorda Therapeutics, Inc. (Acorda)
France
Germany
Spain

Spinal Muscular Atrophy
SMA is characterized by loss of motor neurons in the spinal cord and lower brain stem, resulting in severe and progressive muscular atrophy and weakness. Ultimately, individuals with the most severe type of SMA can become paralyzed and have difficulty performing the basic functions of life, like breathing and swallowing. Due to a loss of, or defect in the SMN1 gene, people with SMA do not produce enough survival motor neuron (SMN) protein, which is critical for the maintenance of motor neurons. The severity of SMA correlates with the amount of SMN protein. People with Type 1 SMA, the most severe life-threatening form, produce very little SMN protein and do not achieve the ability to sit without support or live beyond two years without respiratory support. People with Type 2 and Type 3 produce greater amounts of SMN protein and have less severe, but still life-altering, forms of SMA.
In December 2016 the FDA approved SPINRAZA for the treatment of patients with relapsing forms of MS. AVONEX is a recombinant form of the interferon beta protein producedSMA in pediatric and adult patients. We are currently in the body in response to viral infection. The principal markets for AVONEX are the U.S., United Kingdom, France, Germany, Italy and Spain.
PLEGRIDY (peginterferon beta-1a), a subcutaneous injectable therapy, indicatedearly stages of commercial launch in the U.S.

Our products for the treatmentSMA and major markets include:
ProductIndicationCollaboratorMajor Markets
 
Spinal muscular atrophyIonisU.S.
Other
ProductIndicationCollaboratorMajor Markets
Moderate to severe plaque psoriasisNoneGermany
Biosimilars
Biosimilars are a group of patientsbiologic medicines that are similar to currently available biologic therapies known as originators. Under our agreement with relapsing forms of MSSamsung Bioepis, we manufacture and commercialize two anti-TNF biosimilars in certain countries in the European Union (E.U.) for relapsing-remitting MS (RRMS). PLEGRIDY received approval from the European Commission (EC) in July 2014E.U.: BENEPALI, an etanercept biosimilar referencing ENBREL and the U.S. Food and Drug Administration (FDA) in August 2014.FLIXABI, an infliximab biosimilar referencing REMICADE:
TECFIDERA (dimethyl fumarate), an oral therapy indicated in the U.S. for the treatment of patients with relapsing forms of MS and in the EU for people with RRMS. TECFIDERA was approved by the FDA in March 2013 and the EC in February 2014.
ProductIndicationMajor Markets
Moderate to severe rheumatoid arthritis
Progressive psoriatic arthritis
Axial spondyloarthritis
Moderate to severe plaque psoriasis
Denmark
Germany
Netherlands
Norway
United Kingdom
Rheumatoid arthritis
Moderate to severe Crohn's disease
Severe ulcerative colitis
Severe ankylosing spondylitis
Psoriatic arthritis
Moderate to severe plaque psoriasis
Germany
Netherlands
United Kingdom
Genentech Relationships
TYSABRI (natalizumab), a monoclonal antibody approved in numerous countries as a monotherapy for the treatment of patients with relapsing forms of MS. TYSABRI is also approved in the U.S. to treat Crohn's disease, an inflammatory disease of the intestines. The principal markets for TYSABRI in MS are the U.S., the United Kingdom, France, Germany, Italy and Spain. TYSABRI was approved in Japan in March 2014.

2


FAMPYRA (prolonged-release fampridine tablets),is indicated for the improvement of walking ability in adult patients with MS. FAMPYRA is a prolonged-release tablet formulation of the drug fampridine. We have a license from Acorda Therapeutics, Inc. (Acorda)collaboration agreement with Genentech that entitles us to developcertain business and commercialize FAMPYRA in all markets outside the U.S. Our principal markets for FAMPRYA are France, Germany, Spainfinancial rights with respect to RITUXAN, GAZYVA and Canada. other anti-CD20 product candidates. Current products include:
ProductIndicationMajor Markets
Non-Hodgkin's lymphoma
CLL
Rheumatoid arthritis
Two forms of ANCA-associated vasculitis

U.S.
Canada
In combination with chlorambucil for previously untreated CLL
Follicular lymphoma
U.S.
For information about our agreementanti-CD20 therapeutic programs and related agreements with Acorda,Genentech, please read Note 20,1, Summary of Significant Accounting Policies and Note 19, Collaborative and Other Relationships to our consolidated financial statements included in this report.

Hemophilia Products
Patient Support and Access
We develop, manufactureinteract with patients, advocacy organizations and market productshealthcare societies in order to gain insights into unmet needs. The insights gained from these engagements help us support patients with services, programs and applications that are designed to treathelp patients lead better lives. Among other things, we provide customer service and other related programs for our products, such as disease and product specific websites, insurance research services, financial assistance programs, and the facilitation of the procurement of our marketed products.
We are dedicated to helping patients obtain access to our therapies. Our patient representatives have access to a comprehensive suite of financial assistance tools. With those tools, we help patients understand their insurance coverage and, if needed, help patients compare and select new insurance options and programs. In the U.S., we have established programs that provide co-pay assistance or free marketed product for qualified uninsured or underinsured patients, based on specific eligibility criteria. We also provide charitable contributions to independent charitable organizations that assist patients with hemophilia A and B. Hemophilia A is caused by having substantially reduced or no Factor VIII activity and hemophilia B is caused by having substantially reduced or no Factor IX activity, each of which is needed for normal blood clotting. Peopleout-of-pocket expenses associated with hemophilia A and B experience bleeding episodes that may cause pain, irreversible joint damage and life-threatening hemorrhages. Prophylactic infusions of Factor VIII or Factor IX, as applicable, temporarily replace clotting factor necessary to control bleeding and prevent new bleeding episodes. Our products for hemophilia A and B include:
ALPROLIX [Coagulation Factor IX (Recombinant), Fc Fusion Protein], a recombinant DNA-derived, coagulation Factor IX concentrate indicated in the U.S. for treatment in adults and children with hemophilia B for control and prevention of bleeding episodes, perioperative management and routine prophylaxis to prevent or reduce the frequency of bleeding episodes. ALPROLIX was approved by the FDA in March 2014 and in Japan in June 2014.their therapy.
ELOCTATE [Antihemophilic Factor (Recombinant), Fc Fusion Protein], a recombinant DNA-derived, antihemophilic factor indicated in the U.S. for treatment in adults and children with hemophilia A for control and prevention of bleeding episodes, perioperative management and routine prophylaxis to prevent or reduce the frequency of bleeding episodes. ELOCTATE was approved by the FDA in June 2014 and in Japan in December 2014.
We collaborate with Swedish Orphan Biovitrum AB (Sobi) to jointly develop and commercialize Factor VIII and Factor IX hemophilia products, including ELOCTATE and ALPROLIX. For information about our agreement with Sobi, please read Note 20, Collaborative and Other Relationships to our consolidated financial statements included in this report.
Genentech Collaboration
We collaborate with Genentech, Inc. (Genentech), a wholly-owned member of the Roche Group, on the development and commercialization of RITUXAN. We also share operating profits and losses relating to GAZYVA with Genentech in the U.S. The Roche Group and its sub-licensees maintain sole responsibility for the development, manufacturing and commercialization of GAZYVA in the U.S. For information about our unconsolidated joint business and agreement with Genentech, please read Note 1, Summary of Significant Accounting Policies and Note 20, Collaborative and Other Relationships to our consolidated financial statements included in this report.
RITUXAN (rituximab), a widely prescribed monoclonal antibody used to treat non-Hodgkin's lymphoma, rheumatoid arthritis, chronic lymphocytic leukemia (CLL) and two forms of ANCA-associated vasculitis. Non-Hodgkin's lymphoma and CLL are cancers that affect lymphocytes, which are a type of white blood cell that help to fight infection. Rheumatoid arthritis is a chronic disease that occurs when the immune system mistakenly attacks the body's joints, resulting in inflammation, pain and joint damage. ANCA-associated vasculitis is a rare autoimmune disease that largely affects the small blood vessels of the kidneys, lungs, sinuses, and a variety of other organs.
GAZYVA(obinutuzumab), in combination with chlorambucil, is indicated for the treatment of patients with previously untreated CLL. The FDA granted GAZYVA breakthrough therapy designation due to the significance of the positive progression-free survival results from the Phase 3 CLL11 clinical trial and the serious and life threatening nature of CLL. GAZYVA was approved by the FDA in November 2013.
Other
FUMADERM (fumaric acid esters), a prolonged-release tablet formulation approved in Germany only for the treatment of adult patients with moderate to severe plaque psoriasis. Psoriasis is a skin disease in which cells build up on the skin surface and form scales and red patches.


3


Marketing and Distribution
Sales Force and Marketing
We promote our products worldwide, including in the U.S., most of the major countries of the E.U. and Japan, primarily through our own sales forces and marketing groups. In some countries, particularly in areas where we continue to expand into new geographic areas, we partner with third parties. We co-promote ZINBRYTA with AbbVie in the U.S., E.U. and Canadian territories.
We focus our sales and marketing efforts on specialist physicians in private practice or at major medical centers. We use customary pharmaceutical company practices to market our products and to educate physicians, such as sales representatives calling on individual physicians, advertisements, professional symposia, direct mail, public relations and other methods. We provide customer service and other related programs for our products, such as disease and product specific websites, insurance research services and order, delivery and fulfillment services. We have also established programs in the U.S. which provide qualified uninsured or underinsured patients with marketed products at no or reduced charge, based on specific eligibility criteria.
Distribution Arrangements
We distribute our products in the U.S. principally through wholesale distributors of pharmaceutical products, mail order specialty distributors or shipping service providers. In other countries, the distribution of our products varies from country to country, including through wholesale distributors of pharmaceutical products and third partythird-party distribution partners who are responsible for most marketing and distribution activities.
AbbVie distributes ZINBRYTA in the U.S., and we distribute ZINBRYTA in ex-U.S. markets.
RITUXAN and GAZYVA are marketed and distributed by the Roche Group and its sublicensees.
Our product sales to two wholesale distributors, AmerisourceBergen and McKesson, each accounted for more than 10% of our total revenues for the years ended December 31, 2014, 20132016, 2015 and 2012,2014, and on a combined basis, these wholesale distributors accounted for approximately 60%, 56% and 30% of our gross product revenues for such years, respectively. For additional information, please read Note 1, Summary of Significant Accounting Policies to our consolidated financial statements included in this report.




Patents and Other Proprietary Rights
Patents are important to obtaining and protecting exclusive rights in our products and product candidates. We regularly seek patent protection in the U.S. and in selected countries outside the U.S. for inventions originating from our research and development efforts. In addition, we license rights to various patents and patent applications.
U.S. patents, as well as most foreign patents, are generally effective for 20 years from the date the earliest application was filed; however, U.S. patents that issue on applications filed before June 8, 1995 may be effective until 17 years from the issue date, if that is later than the 20 year date. In some cases, the patent term may be extended to recapture a portion of the term lost during regulatory review of the claimed therapeutic or, in the case of the U.S., because of U.S. Patent and Trademark Office (USPTO) delays in prosecuting the application. Specifically, in the U.S., under the Drug Price Competition and Patent Term Restoration Act of 1984, commonly known as the Hatch-Waxman Act, a patent that covers an FDA-approved drug may be eligible for patent term extension (for up to five years, but not beyond a total of 14 years from the date of product approval) as compensation for patent term lost during the FDA regulatory review process. The duration and extension of the term of foreign patents varies, in accordance with local law. For example, supplementary protection certificates (SPCs) on some of our products have been granted in a number of European countries, compensating in part for delays in obtaining marketing approval.
Regulatory exclusivity, which may consist of regulatory data protection and market protection, also can provide meaningful protection for our products. Regulatory data protection provides to the holder of a drug or biologic marketing authorization, for a set period of time, the exclusive use of the proprietary pre-clinical and clinical data that it created at significant cost and submitted to the applicable regulatory authority to obtain approval of its product. After the applicable set period of time, third parties are then permitted to rely upon our data to file for approval of their abbreviated applications for, and to market (subject to any applicable market protection), their generic drugs and biosimilars referencing our data. Market protection provides to the holder of a drug or biologic marketing authorization the exclusive right to commercialize its product for a set period of
time, thereby preventing the commercialization of another product containing the same active ingredient(s) during that period. Although the World Trade Organization's agreement on trade-related aspects of intellectual property rights (TRIPS) requires signatory countries to provide regulatory exclusivity to innovative pharmaceutical products, implementation and enforcement varies widely from country to country.
We also rely upon other forms of unpatented confidential information to remain competitive. We protect such information principally through confidentiality agreements with our employees, consultants, outside scientific collaborators, scientists whose research we sponsor and other advisers. In the case of our employees, these agreements also provide, in compliance with relevant law, that inventions and other intellectual property conceived by such employees during their employment shall be our exclusive property.
Our trademarks are important to us and are generally covered by trademark applications or registrations in the USPTO and the patent or trademark offices of other countries. We also use trademarks licensed from third parties, such as the trademark FAMPYRA which we license from Acorda. Trademark protection varies in accordance with local law, and continues in some countries as long as the trademark is used and in other countries as long as the trademark is registered. Trademark registrations generally are for fixed but renewable terms.
Our Patent Portfolio
The following table describes our patents in the U.S. and Europe that we currently consider of primary importance to our marketed products, including the territory, patent number, general subject matter and expected expiration dates. Except as otherwise noted, the expected expiration dates include any granted patent term extensions and issued SPCs. In some instances, there are later-expiring patents relating to our products directed to, among other things, particular forms or compositions, methods of manufacturing, or use of the drug in the treatment of particular diseases or conditions. We also continue to pursue additional patents and patent term extensions in the U.S. and other territories covering various aspects of our products that may, if issued, extend exclusivity beyond the expiration of the patents listed in the table.


Product Territory Patent No. General Subject Matter 
Patent
Expiration(1)
TECFIDERA U.S. 7,619,001 Methods of treatment 2018
  U.S. 7,803,840 Methods of treatment 2018
  U.S. 8,399,514 Methods of treatment 2028
  U.S. 8,524,773 Methods of treatment 2018
  U.S. 6,509,376 Formulations of dialkyl fumarates for use in the treatment of autoimmune diseases 2019
  U.S. 8,759,393 Formulations 2019
  U.S. 7,320,999 Methods of treatment 2020
  Europe 1131065 Formulations of dialkyl fumarates and their use for treating autoimmune diseases 
2019(2)
  Europe 2137537 Methods of use 
2028(3)
AVONEX and PLEGRIDY U.S. 7,588,755 Use of recombinant beta interferon for immunomodulation 2026
PLEGRIDY U.S. 7,446,173 Polymer conjugates of interferon beta-1a 2022
  U.S. 8,524,660 Methods of treatment 2023
  U.S. 8,017,733 Polymer conjugates of interferon beta-1a 2025
  Europe 1656952 Polymer conjugates of interferon-beta-1a and uses thereof 2019
  Europe 1476181 Polymer conjugates of interferon-beta-1a and uses thereof 2023
TYSABRI U.S. 5,840,299 Humanized immunoglobulins; nucleic acids; pharmaceutical compositions; methods of use 2017
  U.S. 6,602,503 Humanized recombinant antibodies; nucleic acids and host cells; processes for production; therapeutic compositions; methods of use 2020
  U.S. 7,807,167 Methods of treatment 2023
  U.S. 9,493,567 Methods of treatment 2027
  Europe 0804237 Humanized immunoglobulins; nucleic acids; pharmaceutical compositions; medical uses 
2020(4)
  Europe 1485127 Methods of use 2023
FAMPYRA Europe 1732548 Sustained-release aminopyridine compositions for increasing walking speed in patients with MS 
2025(5)
  Europe 23775536 Sustained-release aminopyridine compositions for treating MS 
2025(6)
ZINBRYTA U.S. 8,454,965 Methods of treatment 2024
  U.S. 7,258,859 Methods of treatment 2024
  U.S. 9,340,619 Daclizumab HYP compositions 2032
  Europe 1539200 Anti-IL-2-receptor antibody for use in a method of treating a subject with MS 2023
SPINRAZA U.S. 6,166,197 Oligomeric Compounds Having Pyrimidine Nucleotide(s) 2017
  U.S. 6,210,892 Alteration of Cellular Behavior By Antisense Modulation of MRNA Processing 2018
  U.S. 7,101,993 Oligonucleotides Containing 2’-O-Modified Purines 2023
  U.S. 7,838,657 SMA Treatment Via Targeting of SMN2 Splice Site Inhibitory Sequences 2027
  U.S. 8,110,560 SMA Treatment Via Targeting of SMN2 Splice Site Inhibitory Sequences 2025
  U.S. 8,361,977 Compositions And Methods For Modulation of SMN2 Splicing 2030
  U.S. 8,980,853 Compositions And Methods For Modulation of SMN2 Splicing 2030
  Europe 1910395 Compositions And Methods For Modulation of SMN2 Splicing 2026
  Europe 2548560 Compositions And Methods For Modulation of SMN2 Splicing 2026
Footnotes follow on next page.

(1)In addition to patent protection, certain of our products are entitled to regulatory exclusivity in the U.S. and the E.U. expected until the dates set forth below:
ProductTerritoryExpected Expiration
TECFIDERAU.S.2018
E.U.2024
PLEGRIDYU.S.2026
E.U.2024
TYSABRIU.S.2016
E.U.2016
FAMPYRAE.U.2021
ZINBRYTAU.S.2028
E.U.*
SPINRAZAU.S.2023
*ZINBRYTA was not designated a new active substance at the time of its approval in the E.U. and is not automatically entitled to regulatory exclusivity. Regulatory exclusivity may, however, be available for independent development of known active substances. We intend to assert the protection of its data on this basis.
(2)This patent is subject to granted SPCs in certain European countries, which extended the patent term in those countries to 2024.
(3)This patent was revoked in a European opposition. This decision is being appealed. The patent is subject to granted SPCs in certain European countries, which extended the patent term in those countries to 2029.
(4)Reflects SPCs granted in most European countries.
(5)This patent is subject to granted SPCs in certain European countries, which extended the patent term in those countries to 2026.
(6)This patent is subject to granted SPCs in certain European countries, which extended the patent term in those countries to 2026.
The existence of patents does not guarantee our right to practice the patented technology or commercialize the patented product. Patents relating to pharmaceutical, biopharmaceutical and biotechnology products, compounds and processes, such as those that cover our existing compounds, products and processes and those that we will likely file in the future, do not always provide complete or adequate protection. Litigation, interferences, oppositions, inter partes reviews or other proceedings are, have been and may in the future be necessary in some instances to determine the validity and scope of certain of our patents, regulatory exclusivities or other proprietary rights, and in other instances to determine the validity, scope or non-infringement of certain patent rights claimed by third parties to be pertinent to the manufacture, use or sale of our products. We may also face challenges to our patents, regulatory exclusivities and other proprietary rights covering our products by manufacturers of generics and biosimilars. A discussion of certain risks and uncertainties that may affect our patent position, regulatory exclusivities and other proprietary rights is set forth in the “Risk Factors” section of this report, and a discussion of legal proceedings related to certain patents described above is set forth in Note 20, Litigation to our consolidated financial statements included in this report.

Competition
Competition in the biopharmaceutical industry is intense and comes from many sources, including specialized biotechnology firms and large pharmaceutical companies. Many of our competitors are working to develop products similar to those we are developing or already market and have considerable experience in undertaking clinical trials and in obtaining regulatory approval to market pharmaceutical products. Certain of these companies have substantially greater financial, marketing and research and development resources than we do.
We believe that competition and leadership in the industry is based on managerial and technological excellence and innovation as well as establishing patent and other proprietary positions through research and development. The achievement of a leadership position also depends largely upon our ability to maximize the approval, acceptance and use of products resulting from research and the availability of adequate financial resources to fund facilities, equipment, personnel, clinical testing, manufacturing and marketing. Another key aspect of remaining competitive within the industry is recruiting and retaining leading scientists and technicians. We believe that we have been successful in attracting and retaining skilled and experienced scientific personnel.
Competition among products approved for sale may be based, among other things, on patent position, product efficacy, safety, convenience/delivery devices, reliability, availability and price. In addition, early entry of a new pharmaceutical product into the market may have important advantages in gaining product acceptance and market share. Accordingly, the relative speed with which we can develop products, complete the testing and approval process and supply commercial quantities of products will have a significant impact on our competitive position.
The introduction of new products or technologies, including the development of new processes or technologies by competitors or new information about existing products or technologies, may result in increased competition for our marketed products or pricing pressure on our marketed products. It is also possible that the development of new or improved treatment options or standards of care or cures for the diseases our products treat could reduce or eliminate the use of our products or may limit the utility and application of ongoing clinical trials for our product candidates. We may also face increased competitive pressures as a result of generics and the emergence of biosimilars in the U.S. and E.U. If a generic or biosimilar version of one of our products were approved, it could reduce our sales of that product.
Additional information about the competition that our marketed products face is set forth below.
Multiple Sclerosis
TECFIDERA, AVONEX, PLEGRIDY, TYSABRI and ZINBRYTA each compete with one or more of the following products:
Competing ProductCompetitor
AUBAGIO (teriflunomide)Sanofi
BETASERON/BETAFERON (interferon-beta-1b)Bayer Group
COPAXONE
(glatiramer acetate)
Teva Pharmaceuticals Industries Ltd.
EXTAVIA
(interferon-beta-1b)
Novartis AG
GLATOPA (glatiramer acetate)Sandoz, a division of Novartis AG
GILENYA (fingolimod)Novartis AG
LEMTRADA (alemtuzumab)Sanofi
REBIF
(interferon-beta-1)
Merck KGaA (and co-promoted with Pfizer Inc. in the U.S.)
FAMPYRA is indicated as a treatment to improve walking in adult patients with MS who have walking disability and is the first treatment that addresses this unmet medical need with demonstrated efficacy in people with all types of MS. FAMPYRA is currently the only therapy approved to improve walking in patients with MS.
Competition in the MS market is intense. Along with us, a number of companies are working to develop additional treatments for MS that may in the future compete with our MS products. One such product candidate is OCREVUS, a potential treatment for RMS and PPMS being developed by Genentech. While we have a financial interest in OCREVUS, future sales of our MS products may be adversely affected by the commercialization of OCREVUS, as well as by other MS products we or our competitors are developing. Future sales may also be negatively impactedbythe introduction of generics, prodrugs of existing therapeutics or biosimilars of existing products.


Spinal Muscular Atrophy
SPINRAZA is the only approved treatment for SMA. We are aware of other products in development that, if successfully developed and approved, may compete with SPINRAZA in the SMA market.
Psoriasis
FUMADERM competes with several different types of therapies in the psoriasis market within Germany, including oral systemics such as methotrexate and cyclosporine.
Biosimilars
BENEPALI and FLIXABI, the two biosimilars we currently manufacture and commercialize in the E.U. for Samsung Bioepis, compete with their applicable reference products, ENBREL and REMICADE, respectively, as well as other biosimilars of those reference products.
Genentech Relationships in Other Indications
RITUXAN and GAZYVA in Oncology
RITUXAN and GAZYVA compete with a number of therapies in the oncology market, including TREANDA (bendamustine HCL), ARZERRA (ofatumumab), IMBRUVICA (ibrutinib) and ZYDELIG (idelalisib).
We also expect that over time GAZYVA will increasingly compete with RITUXAN in the oncology market. In addition, we are aware of other anti-CD20 molecules, including biosimilars, in development that, if successfully developed and approved, may compete with RITUXAN and GAZYVA in the oncology market.
RITUXAN in Rheumatoid Arthritis
RITUXAN competes with several different types of therapies in the rheumatoid arthritis market, including, among others, traditional disease-modifying anti-rheumatic drugs such as steroids, methotrexate and cyclosporine, TNF inhibitors, ORENCIA (abatacept), ACTEMRA (tocilizumab) and XELJANZ (tofacitinib).
We are also aware of other products, including biosimilars, in development that, if successfully developed and approved, may compete with RITUXAN in the rheumatoid arthritis market.


Research and Development Programs
A commitment to research is fundamental to our company’s mission. Our research and development strategy is toefforts are focused on better understanding the underlying biology of diseases so we can discover and develop differentiated moleculesdeliver treatments that improve safety or efficacy forhave the potential to make a real difference in the lives of patients with high unmet medical needs. By applying our expertise in biologics and our growing capabilities in small molecule, antisense, gene therapy, gene editing and other technologies, we target specific medical needs where we believe new or better treatments are needed.
We intend to continue committing significant resources to research and development opportunities. As part of our ongoing research and development efforts, we have devoted significant resources to conducting clinical studies to advance the development of new pharmaceutical products and technologies and to explore the utility of our existing products in treating disorders beyond those currently approved in their labels. For the years ended December 31, 2014, 2013 and 2012, research and development expenses were $1,893.4 million, $1,444.1 million and $1,334.9 million, respectively.
The table below highlights our current research and development programs that are in clinical trials.trials and the current phase of such programs. Drug development involves a high degree of risk and investment, and the status, timing and scope of our development programs are subject to change. Important factors that could adversely affect our drug development efforts are discussed in the “Risk Factors” section of this report.

4


Therapeutic AreaProduct CandidateCollaboratorTargeted IndicationsPHASE 1 Collaborator (1)PHASE 2 Status
NeurologyPHASE 3 ZINBRYTA (daclizumab high yield process)MSAbbVie BiotherapeuticsPhase 3 completed; Expect to submit MAA to FDA and EMA in 2015FILED
OCREVUSGenentech (Roche Group)TYSABRI (natalizumab)Secondary progressive MSNonePhase 3
Primary Progressive & Relapsing Multiple Sclerosis  Acute Ischemic StrokeNonePhase 2
ISIS - SMNRx
Spinal muscular atrophyIsis PharmaceuticalsPhase 3
Anti-LINGOAcute Optic NeuritisNonePhase 2
MSNonePhase 2
NeublastinNeuropathic painNonePhase 2
BIIB037Alzheimer’s diseaseNeurimmune SubOne AGPhase 1b; Preparing for Phase 3
BAN2401Alzheimer’s diseaseEisaiPhase 2
E2609Alzheimer’s diseaseEisaiPhase 2
ISIS - DMPKRx
Myotonic Dystrophy

Isis PharmaceuticalsPhase 1
BIIB061MSNonePhase 1
         
HematologyALPROLIX [Coagulation Factor IX (Recombinant), Fc Fusion Protein]Hemophilia B
Swedish Orphan Biovitrum

Expect to submit MAA to EMA in 2015

  ELOCTATE [Antihemophilic Factor (Recombinant), Fc Fusion Protein] Hemophilia A
Biosimilar adalimumabSamsung BioepisMultiple Immunology Indications in Europe 
Swedish Orphan Biovitrum

MAA submitted and under regulatory review by EMA

         
ImmunologySTX-100Idiopathic pulmonary fibrosisNonePhase 2a
  Anti-TWEAKLupus nephritisNonePhase 2
  Anti-CD40 LigandSystemic lupus erythematosusUCB PharmaPhase 1b
Anti-BDCA2Systemic lupus erythematosusNonePhase 1
OtherGAZYVA (obinutuzumab)
Non-Hodgkin’s lymphoma

Genentech (Roche Group)Front-Line Indolent Non Hodgkin’s LymphomaPhase 3
    Lupus nephritis Genentech (Roche Group) Phase 2
AducanumabNeurimmune SubOne AGAlzheimer's Disease
E2609Eisai Co., Ltd. (Eisai)Alzheimer's Disease
BIIB074NoneTrigeminal Neuralgia
BIIB074NoneLumbosacral Radiculopathy
BIIB074NoneErythromelalgia
BAN2401EisaiAlzheimer's Disease
Opicinumab (anti-LINGO-1)NoneMultiple Sclerosis
TYSABRINoneAcute Ischemic Stroke
rAAV-XLRSAGTCX-linked Juvenile Retinoschisis
BG00011 (STX-100)NoneIdiopathic Pulmonary Fibrosis
Dapirolizumab pegolUCB PharmaLupus
BIIB059 (Anti-BDCA02)NoneLupus
BIIB061NoneMS
BIIB054NonePD*
BIIB067 (IONIS-SOD1Rx)
IonisALS**
BIIB068 (BTK Inhibitor)NoneA***��
(1)
For information about certain of our agreements with collaborators and other third parties, please see “Business Relationships” below and Note 20,
* Parkinson's Disease
** Amyotrophic Lateral Sclerosis
*** Autoimmune
For information about certain of our agreements with collaborators and other third parties, please read the subsection entitled “Business Relationships” below and Note 19, Collaborative and Other Relationships to our consolidated financial statements included in this report.

Late Stage Product Candidates
Additional information about our late stage product candidates, which includes programs in Phase 3 development or in registration stage, is set forth below.
ZINBRYTA (daclizumab high yield process)
ZINBRYTA is a monoclonal antibody that is being tested in RRMS. In June 2014, we announced positive top-line results from the Phase 3 DECIDE clinical trial, which investigated ZINBRYTA as a potential once-monthly, subcutaneous treatment for RRMS. Results showed that ZINBRYTA was superior on the study's primary endpoint, demonstrating a statistically significant reduction in annualized relapse rates when compared to interferon beta-1a (AVONEX).
TYSABRI (natalizumab)
In May 2013, we completed patient enrollment in a Phase 3 study of TYSABRI in secondary progressive MS, known as ASCEND. The study has a duration of approximately two years and involves approximately 875 patients. Secondary progressive MS is characterized by a steady progression of nerve damage, symptoms and disability.
ELOCTATE [Antihemophilic Factor (Recombinant), Fc Fusion Protein]
In June 2014, ELOCTATE, a recombinant factor VIII Fc fusion protein (rFVIIIFc), was approved by the FDA for the treatment of hemophilia A. In October 2014, we submitted a marketing authorization application (MAA) to the European Medicines Agency (EMA) for ELOCTA, the trade name for ELOCTATE in the E.U. The regulatory application included results from A-LONG, the pivotal Phase 3 clinical study that examined the efficacy, safety and pharmacokinetics of rFVIIIFc in males 12 years of age and older with severe hemophilia A and from Kids A-LONG, the Phase 3 clinical study that evaluated the efficacy and safety of rFVIIIFc in children with hemophilia A under the age of 12.

5


ALPROLIX [Coagulation Factor IX (Recombinant), Fc Fusion Protein]
In March 2014, ALPROLIX was approved by the FDA for the treatment of hemophilia B. Pediatric data will be required as part of the MAA for ALPROLIX that we plan to submit to the EMA. We have initiated Kids B-LONG, a global pediatric study evaluating the efficacy and safety of recombinant factor IX Fc fusion protein (rFIXFc) in children with hemophilia B under the age of 12.
GAZYVA
The Roche Group is managing the following Phase 3 studies of GAZYVA:
Neurodegeneration
Aducanumab (BIIB037)
lIn September 2015 we enrolled our first patient in our two global Phase 3 studies, ENGAGE and EMERGE. ENGAGE and EMERGE will assess the efficacy and safety of aducanumab, our investigational treatment for early Alzheimer's disease, in approximately 2,700 people with early Alzheimer's disease. The studies are identical in design and eligibility criteria. Each study will be conducted in more than 20 countries in North America, Europe and Asia. In October 2015 we announced that we received FDA agreement on a special protocol assessment on the Phase 3 study protocols.
lIn June 2016 we announced that aducanumab was accepted into the European Medicines Agency's (EMA's) Priority Medicines (PRIME) program. PRIME aims to bring treatments to patients more quickly by enhancing the EMA's support for the development of investigational medicines for diseases without available treatments or in need of better treatment options.
lIn September 2016 aducanumab was granted Fast Track designation by the FDA. The FDA’s Fast Track program supports the development of new treatments for serious conditions with an unmet medical need such as Alzheimer’s disease. We also announced that in a recently completed interim analysis from our Phase 1b study of aducanumab in early Alzheimer's disease efficacy and safety data were consistent with results previously reported.
lIn December 2016 we presented new data from the Phase 1b study of aducanumab, which included interim results from the titration cohort of the placebo-controlled period of the Phase 1b study as well as data from the first year of the long-term extension. The results supported the ongoing Phase 3 studies of aducanumab for early Alzheimer’s disease.
E2609
lIn October 2016 Eisai announced enrollment has commenced in MISSION AD, a Phase 3 clinical program of the beta secretase cleaving enzyme (BACE) inhibitor E2609 in patients with early Alzheimer's disease in the U.S.
GOYA: investigating the efficacy and safety of GAZYVA in combination with CHOP chemotherapy compared to RITUXAN with CHOP chemotherapy in previously untreated patients with CD20-positive diffuse large B-cell lymphoma.
Biosimilars (Samsung Bioepis - Biogen's Joint Venture with Samsung Biologics)
Adalimumab (SB5)
lIn July 2016 the EMA accepted Samsung Bioepis' MAA for SB5, an adalimumab biosimilar candidate referencing HUMIRA. If approved by the EC, we will manufacture and commercialize SB5 in specified E.U. countries.
GALLIUM: investigating the efficacy and safety of GAZYVA in combination with chemotherapy followed by maintenance with GAZYVA compared to RITUXAN in combination with chemotherapy followed by maintenance with RITUXAN in previously untreated patients with indolent non-Hodgkin's lymphoma.
GADOLIN: investigating the efficacy and safety of GAZYVA plus bendamustine compared with bendamustine alone in patients with RITUXAN-refractory, indolent non-Hodgkin's lymphoma. In February 2015, the Roche Group announced positive results from the Phase 3 GADOLIN study. At a pre-planned interim analysis, an independent data monitoring committee determined that the study met its primary endpoint early, showing that people lived significantly longer without disease worsening or death (progression-free survival) when treated with GAZYVA plus bendamustine followed by GAZYVA alone, compared to bendamustine alone.
Genentech Relationships
GAZYVA (obinutuzumab)
lThe Roche Group is managing GALLIUM, a Phase 3 study examining the efficacy and safety of GAZYVA plus chemotherapy followed by GAZYVA alone for up to two years, as compared head-to-head against RITUXAN plus chemotherapy followed by RITUXAN alone for up to two years. At a pre-planned interim analysis in May 2016, an independent data monitoring committee determined that the study met its primary endpoint early. The results showed GAZYVA-based treatment significantly reduced the risk of disease worsening or death (progression-free survival) compared to RITUXAN-based treatment.
OCREVUS (ocrelizumab)
lIn June 2015 the Roche Group announced positive results from two Phase 3 studies evaluating OCREVUS compared with interferon beta-1a in people with relapsing forms of MS. Treatment with OCREVUS compared with interferon beta-1a significantly reduced the annualized relapse rate over a two-year period; significantly reduced the progression of clinical disability; and led to a significant reduction in the number of lesions in the brain as measured by MRI.
lIn September 2015 the Roche Group announced positive results from a Phase 3 study evaluating OCREVUS in people with PPMS. Treatment with OCREVUS significantly reduced the progression of clinical disability compared with placebo, as measured by the Expanded Disability Status Scale.
lIn June 2016 the Roche Group announced that the EMA validated its MAA of OCREVUS for the treatment of RMS and PPMS in the E.U. The FDA has also accepted for review its BLA for OCREVUS for the treatment of RMS and PPMS, and has granted the application priority review designation. Under our agreement with Genentech, if OCREVUS is approved, we will receive tiered royalty payments on sales of OCREVUS in the U.S.
ISIS-SMNRx
In August 2014, Isis Pharmaceuticals, Inc. (Isis) announced the initiation of a pivotal Phase 3 study evaluating ISIS-SMNRx in infants with spinal muscular atrophy (SMA), the most common genetic cause of infant mortality. This Phase 3 study, known as ENDEAR, is a randomized, double-blind, sham-procedure controlled thirteen month study in approximately 110 infants diagnosed with SMA. The study will evaluate the efficacy and safety of a 12mg dose of ISIS-SMNRx with a primary endpoint of survival or permanent ventilation. 
In November 2014, Isis announced the initiation of a pivotal Phase 3 study evaluating the efficacy and safety of ISIS-SMNRx in non-ambulatory children with SMA. This Phase 3 study, known as CHERISH, is a randomized, double-blind, sham-procedure controlled fifteen month study in approximately 120 children with SMA. The study will evaluate the efficacy and safety of a 12mg dose of ISIS-SMNRx with a primary endpoint of a change in the Hammersmith Functional Motor Scale-Expanded, a validated method to measure changes in muscle function in patients with SMA.
Business RelationshipsRITUXAN and GAZYVA in Oncology
RITUXAN and GAZYVA compete with a number of therapies in the oncology market, including TREANDA (bendamustine HCL), ARZERRA (ofatumumab), IMBRUVICA (ibrutinib) and ZYDELIG (idelalisib).
We also expect that over time GAZYVA will increasingly compete with RITUXAN in the oncology market. In addition, we are aware of other anti-CD20 molecules, including biosimilars, in development that, if successfully developed and approved, may compete with RITUXAN and GAZYVA in the oncology market.
RITUXAN in Rheumatoid Arthritis
RITUXAN competes with several different types of therapies in the rheumatoid arthritis market, including, among others, traditional disease-modifying anti-rheumatic drugs such as steroids, methotrexate and cyclosporine, TNF inhibitors, ORENCIA (abatacept), ACTEMRA (tocilizumab) and XELJANZ (tofacitinib).
We are also aware of other products, including biosimilars, in development that, if successfully developed and approved, may compete with RITUXAN in the rheumatoid arthritis market.


Research and Development Programs
A commitment to research is fundamental to our mission. Our research efforts are focused on better understanding the underlying biology of diseases so we can discover and deliver treatments that have the potential to make a real difference in the lives of patients with high unmet medical needs. By applying our expertise in biologics and our growing capabilities in small molecule, antisense, gene therapy, gene editing and other technologies, we target specific medical needs where we believe new or better treatments are needed.
We intend to continue committing significant resources to research and development opportunities. As part of our business strategy,ongoing research and development efforts, we establish business relationships, including joint ventureshave devoted significant resources to conducting clinical studies to advance the development of new pharmaceutical products and collaborative arrangements with other companies, universitiestechnologies and medicalto explore the utility of our existing products in treating disorders beyond those currently approved in their labels.
The table below highlights our current research institutionsand development programs that are in clinical trials and the current phase of such programs. Drug development involves a high degree of risk and investment, and the status, timing and scope of our development programs are subject to assistchange. Important factors that could adversely affect our drug development efforts are discussed in the clinical development and/or commercializationRisk Factors” section of this report.

Product CandidateCollaboratorPHASE 1PHASE 2PHASE 3FILED
OCREVUSGenentech (Roche Group)Primary Progressive & Relapsing Multiple Sclerosis
Biosimilar adalimumabSamsung BioepisMultiple Immunology Indications in Europe
GAZYVAGenentech (Roche Group)Front-Line Indolent Non Hodgkin’s Lymphoma
AducanumabNeurimmune SubOne AGAlzheimer's Disease
E2609Eisai Co., Ltd. (Eisai)Alzheimer's Disease
BIIB074NoneTrigeminal Neuralgia
BIIB074NoneLumbosacral Radiculopathy
BIIB074NoneErythromelalgia
BAN2401EisaiAlzheimer's Disease
Opicinumab (anti-LINGO-1)NoneMultiple Sclerosis
TYSABRINoneAcute Ischemic Stroke
rAAV-XLRSAGTCX-linked Juvenile Retinoschisis
BG00011 (STX-100)NoneIdiopathic Pulmonary Fibrosis
Dapirolizumab pegolUCB PharmaLupus
BIIB059 (Anti-BDCA02)NoneLupus
BIIB061NoneMS
BIIB054NonePD*
BIIB067 (IONIS-SOD1Rx)
IonisALS**
BIIB068 (BTK Inhibitor)NoneA***��
* Parkinson's Disease
** Amyotrophic Lateral Sclerosis
*** Autoimmune
For information about certain of our productsagreements with collaborators and product candidates and to provide support for our research programs. We also evaluate opportunities for acquiring products or rights to products and technologies that are complementary to our business from other companies, universities and medical research institutions.
Below is a brief description of our significant relationships and collaborations that expand our pipeline and provide us with certain rights to existing and potential new products and technologies. For more information regarding certain of these relationships, including their ongoing financial and accounting impact on our business,third parties, please read the subsection entitled “Business Relationships” below and Note 20,19, Collaborative and Other Relationships to our consolidated financial statements included in this report.
AbbVie Biotherapeutics, Inc. - We have a collaboration agreement with AbbVie Biotherapeutics, Inc. aimed at advancing the development and commercialization of ZINBRYTA (daclizumab high yield process) in MS.

Acorda Therapeutics, Inc. - We collaborate with Acorda to develop and commercialize products containing fampridine in markets outside the U.S. We also have responsibility for regulatory activities and the future clinical development of related products in those markets.

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Eisai Co., Ltd.- In 2014, we entered into a collaboration with Eisai Co., Ltd. (Eisai) to jointly develop and commercialize E2609 and BAN2401, two Eisai product candidates for the treatment of Alzheimer’s disease. The agreement also provides Eisai with options to jointly develop and commercialize two of our candidates for Alzheimer’s disease, the anti-amyloid beta antibody BIIB037 and an anti-tau monoclonal antibody, upon the exchange of clinical data.
Genentech (Roche Group) - We collaborate with Genentech on the development and commercialization of RITUXAN. In addition, in the U.S. we share operating profits and losses relating to GAZYVA with Genentech. The Roche Group and its sub-licensees maintain sole responsibility for the development, manufacturing and commercialization of GAZYVA in the U.S.
Isis Pharmaceuticals, Inc. - We have three separate exclusive, worldwide option and collaboration agreements with Isis under which both companies will develop and commercialize antisense therapeutics for up to three gene targets, Isis’ product candidates for the treatment of myotonic dystrophy type 1, and the antisense investigational candidate, ISIS-SMNRx for the treatment of SMA. We also have a six-year research collaboration agreement with Isis, which we entered into in 2013, under which both companies will perform discovery level research and develop and commercialize antisense and other therapeutics for the treatment of neurological disorders. 
Samsung Bioepis - We have an agreement with Samsung BioLogics Co. Ltd. (Samsung Biologics), that established an entity, Samsung Bioepis, to develop, manufacture and market biosimilar pharmaceuticals. In December 2013, pursuant to our agreement with Samsung Biologics, we exercised our right to enter into an agreement with Samsung Bioepis to commercialize anti-TNF biosimilar product candidates in Europe. Under the agreement, we will be responsible for commercialization of these product candidates across Europe. In January 2015, Samsung Bioepis' MAA for its ENBREL (etanercept) biosimilar candidate, SB4, was validated and accepted for review by the EMA.
Sangamo BioSciences, Inc. - In 2014, we entered into an exclusive worldwide research, development and commercialization collaboration and license agreement with Sangamo BioSciences, Inc. (Sangamo) under which both companies will develop and commercialize product candidates using gene editing technologies for the treatment of two inherited blood disorders, sickle cell disease and beta-thalassemia.
Swedish Orphan Biovitrum AB - We collaborate with Sobi to jointly develop and commercialize Factor VIII and Factor IX hemophilia products, including ELOCTATE and ALPROLIX. We have commercial rights for North America and for rest of the world markets outside of Europe, Russia, Turkey and certain countries in the Middle East. Subject to the exercise of an opt-in right that Sobi may exercise with respect to each product developed under the collaboration, Sobi will have commercial rights in Europe, Russia, Turkey and certain countries in the Middle East for the applicable product. In November 2014, Sobi exercised its opt-in right to assume final development and commercialization of ELOCTA in those territories.
Patents and Other Proprietary Rights
Patents are important to obtaining and protecting exclusive rights in our drugs and drug candidates. We regularly seek patent protection in the U.S. and in selected countries outside the U.S. for inventions originating from our research and development efforts. In addition, we license rights to various patents and patent applications. U.S. patents, as well as most foreign patents, are generally effective for 20 years from the date the earliest application was filed; however, U.S. patents that issue on applications filed before June 8, 1995 may be effective until 17 years from the issue date, if that is later than the 20 year date. In some cases, the patent term may be extended to recapture a portion of the term lost during FDA regulatory review or, in the case of the U.S., because of U.S. Patent and Trademark Office (USPTO) delays in prosecuting the application. Specifically, in the U.S., under the Drug Price Competition and Patent Term Restoration Act of 1984, commonly known as the Hatch-Waxman Act, the term of a patent that covers an FDA-approved drug may also be eligible for patent term extension (for up to five years, but not beyond a total of 14 years from the date of product approval) as compensation for patent term lost during the FDA regulatory review process. The duration and extension of the term of foreign patents varies similarly, in accordance with local law. For example, supplementary protection certificates (SPCs) on some of our products have been granted in a number of European countries, compensating in part for delays in obtaining marketing approval.

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Regulatory exclusivity, which may consist of regulatory data protection and market protection, also can provide meaningful protection for our products. Regulatory data protection provides to the holder of a drug or biologic marketing authorization, for a set period of time, the exclusive use of the proprietary pre-clinical and clinical data that it created at significant cost and submitted to the applicable regulatory authority to obtain approval of its product. Our products also may qualify for market protection from regulatory authorities, pursuant to which a regulatory authority may not permit for a set period of time, the approval or commercialization of another product containing the same active ingredient(s) as our product. After that set period of time, third parties are then permitted to rely upon our data to obtain approval of their abbreviated applications to market (e.g., generic drugs and biosimilars). Although the World Trade Organization's agreement on trade-related aspects of intellectual property rights (TRIPS) requires signatory countries to provide regulatory exclusivity to innovative pharmaceutical products, implementation and enforcement varies widely from country to country.
We also rely upon other forms of unpatented confidential information to remain competitive. We protect such information principally through confidentiality agreements with our employees, consultants, outside scientific collaborators, scientists whose research we sponsor and other advisers. In the case of our employees, these agreements also provide, in compliance with relevant law, that inventions and other intellectual property conceived by such employees during their employment shall be our exclusive property.
Our trademarks are important to us and are generally covered by trademark applications or registrations in the USPTO and the patent or trademark offices of other countries. We also use trademarks licensed from third parties, such as the trademark FAMPYRA which we license from Acorda Therapeutics. Trademark protection varies in accordance with local law, and continues in some countries as long as the trademark is used and in other countries as long as the trademark is registered. Trademark registrations generally are for fixed but renewable terms.
A discussion of certain risks and uncertainties that may affect our patent position and proprietary rights is set forth in the “Risk Factors” section of this report.Late Stage Product Candidates
Additional information about the patents, expected regulatory exclusivities and other proprietary rights covering our marketed productslate stage product candidates, which includes programs in Phase 3 development or in registration stage, is set forth below.
AVONEX and PLEGRIDY
We have several U.S. patents and patent applications, and a number of corresponding foreign counterparts, related to AVONEX and/or PLEGRIDY. Our U.S. patent no. 7,588,755 claims the use of recombinant beta interferon for immunomodulation or treating a viral condition, viral disease, cancers or tumors. This patent, which expires in September 2026, covers the treatment of MS with AVONEX and PLEGRIDY. A discussion of legal proceedings related to this patent is set forth in Note 21, Litigation to our consolidated financial statements included in this report.
Additionally, we and another party each own a pending U.S. patent application related to recombinant interferon-beta protein. These applications, which fall outside of the General Agreement on Tariffs and Trade (GATT) amendments to the U.S. patent statute, are not published by the USPTO and, if they mature into granted patents, may be entitled to a term of seventeen years from the grant date. There is a pending interference proceeding in the USPTO involving these applications. We do not know whether either of these applications will mature into patents with claims relevant to AVONEX or to PLEGRIDY.
Additional protection for PLEGRIDY is provided by patents and patent applications with expiration dates out to 2025 in the U.S. and 2019 in the E.U., with the potential for patent term extension. PLEGRIDY is also entitled to regulatory exclusivity until 2026 in the U.S. and 2024 in the E.U.
TECFIDERA
We have several U.S. patents and patent applications, and a number of corresponding foreign counterparts, related to TECFIDERA.
Our principal U.S. patents and expiration dates, subject to pending applications for patent term extension, are:
U.S. patent no. 6,509,376, having claims to formulations of dimethyl fumarate for use in the treatment of autoimmune diseases including MS, expiring in 2019;
U.S. patent no. 7,320,999, having claims to a method of treating MS using dimethyl fumarate, expiring in 2020;
U.S. patent no. 7,619,001, having claims to a method of treating MS using dimethyl fumarate, monomethyl fumarate, or a combination thereof, expiring in 2018;

8


U.S. patent no. 7,803,840, having claims to a method of treating an autoimmune disease selected from autoimmune polyarthritis and MS using dimethyl fumarate, expiring in 2018;
U.S. patent no. 8,399,514, covering the dosing regimen of 480 mg per day of dimethyl fumarate, monomethyl fumarate or combinations thereof for treating MS, expiring in 2028;
U.S. patent no. 8,524,773, having claims to a method of treating MS using dimethyl fumarate, expiring in 2018; and
U.S. patent no. 8,759,393, having claims to formulations of dimethyl fumarate, expiring in 2019.
Our principal European patents and expiration dates, subject to pending applications for supplemental patent certificates, are:
European patent no. (EP) 1131065, directed to formulations of dimethyl fumarate and to uses thereof for treating autoimmune diseases, including MS, expiring in 2019; and
EP 2137537, the counterpart patent to our U.S. patent covering the dosing regimen of 480 mg per day of dimethyl fumarate or monomethyl fumarate for treating MS, expiring in 2028.
In addition to patent protection, in the U.S. TECFIDERA is entitled to regulatory exclusivity until 2018. In the E.U., TECFIDERA is entitled to regulatory exclusivity until 2024.
TYSABRI
We have patents and patent applications covering TYSABRI in the U.S. and other countries. These patents and patent applications cover TYSABRI and related manufacturing methods, as well as various methods of treatment using the product. The principal patents covering the product and use of the product to treat MS are U.S. patent nos. 5,840,299 and 6,602,503 and EP 0804237, which expire between 2017 and 2020 (including supplementary protection certificates in many European countries). Additional U.S. and E.U. patents and applications covering methods of treatment using the product expire in 2023.
In addition to patent protection, TYSABRI is entitled to regulatory exclusivity until 2016 in both the U.S. and the E.U.
FAMPYRA
We have an exclusive license under two European granted patents, several pending European patent applications and numerous corresponding non-U.S. counterpart applications related to FAMPYRA. EP 0484186B1 claims pharmaceutical formulations containing aminopyridines including fampridine. This patent expired in November 2011 but is subject to pending and granted supplemental protection certificates which, where granted, will extend the patent term to 2016 on a country-by-country basis. EP 1732548B1, which claims sustained-release aminopyridine compositions for increasing walking speed in patients with MS, and EP 2377536B1, which claims sustained-release aminopyridine compositions for treating multiple sclerosis, expire in 2025 but are subject to pending and granted supplemental protection certificates which, where granted, will extend one of the patents’ term to 2026 on a country-by-country basis. In addition to these patent rights, FAMPYRA is covered by regulatory exclusivity in Europe until 2021.
ELOCTATE and ALPROLIX
We have several U.S. patents and patent applications, and a number of corresponding foreign counterparts, related to ELOCTATE and ALPROLIX and their use. The principal patents include U.S. patents nos. 7,404,956, 8,329,182, 7,348,004 and 7,862,820. These patents will expire between 2024 and 2025, and some may be entitled to additional patent term pursuant to the patent term extension provisions of the U.S. patent laws. Related European patents EP 1624891 and EP 1625209 expire in 2024 and may be entitled to additional patent term in at least some countries upon approval. Additionally, pending patent applications, if granted, would provide additional patent protection through 2034. ELOCTATE and ALPROLIX are both entitled to regulatory exclusivity in the U.S. until 2026.
RITUXAN and Anti-CD20 Antibodies
We have several U.S. patents and patent applications, and numerous corresponding foreign counterparts, directed to anti-CD20 antibody technology, including RITUXAN. The principal patents with claims to RITUXAN or its uses expire in the U.S. between 2015 and 2018 and expired in the rest of the world in 2013, subject to any available patent term extensions. In addition, we and our collaborator Genentech, have additional patents and patent applications directed to anti-CD20 antibodies and their uses to treat various diseases. Genentech has principal responsibility for managing the intellectual property portfolio for RITUXAN and the other anti-CD20 antibodies under our agreements with Genentech.

9


Competition
Competition in the biopharmaceutical industries is intense and comes from many sources, including specialized biotechnology firms and large pharmaceutical companies. Many of our competitors are working to develop products similar to those we are developing or already market and have considerable experience in undertaking clinical trials and in obtaining regulatory approval to market pharmaceutical products. Certain of these companies have substantially greater financial, marketing and research and development resources than we do.
We believe that competition and leadership in the industry is based on managerial and technological excellence and innovation as well as establishing patent and other proprietary positions through research and development. The achievement of a leadership position also depends largely upon our ability to identify and exploit commercially the products resulting from research and the availability of adequate financial resources to fund facilities, equipment, personnel, clinical testing, manufacturing and marketing. Another key aspect of remaining competitive within the industry is recruiting and retaining leading scientists and technicians. We believe that we have been successful in attracting skilled and experienced scientific personnel.
Competition among products approved for sale may be based, among other things, on patent position, product efficacy, safety, convenience/delivery devices, reliability, availability and price. In addition, early entry of a new pharmaceutical product into the market may have important advantages in gaining product acceptance and market share. Accordingly, the relative speed with which we can develop products, complete the testing and approval process and supply commercial quantities of products will have an important impact on our competitive position.
The introduction of new products or technologies, including the development of new processes or technologies by competitors or new information about existing products may result in increased competition for our marketed products or could result in pricing pressure on our products. It is also possible that the development of new treatment options or standards of care could reduce the use of our products or may limit the utility and application of ongoing clinical trials for our product candidates. We may also face increased competitive pressures as a result of generics and the emergence of biosimilars in the U.S. and E.U. If a generic or biosimilar version of one of our products were approved, it could reduce our sales of that product.
Additional information about the competition that our marketed products face is set forth below.
AVONEX, PLEGRIDY, TYSABRI and TECFIDERA
AVONEX, PLEGRIDY, TYSABRI and TECFIDERA each compete with one or more of the following products:
Neurodegeneration
Aducanumab (BIIB037)
lIn September 2015 we enrolled our first patient in our two global Phase 3 studies, ENGAGE and EMERGE. ENGAGE and EMERGE will assess the efficacy and safety of aducanumab, our investigational treatment for early Alzheimer's disease, in approximately 2,700 people with early Alzheimer's disease. The studies are identical in design and eligibility criteria. Each study will be conducted in more than 20 countries in North America, Europe and Asia. In October 2015 we announced that we received FDA agreement on a special protocol assessment on the Phase 3 study protocols.
lIn June 2016 we announced that aducanumab was accepted into the European Medicines Agency's (EMA's) Priority Medicines (PRIME) program. PRIME aims to bring treatments to patients more quickly by enhancing the EMA's support for the development of investigational medicines for diseases without available treatments or in need of better treatment options.
lIn September 2016 aducanumab was granted Fast Track designation by the FDA. The FDA’s Fast Track program supports the development of new treatments for serious conditions with an unmet medical need such as Alzheimer’s disease. We also announced that in a recently completed interim analysis from our Phase 1b study of aducanumab in early Alzheimer's disease efficacy and safety data were consistent with results previously reported.
lIn December 2016 we presented new data from the Phase 1b study of aducanumab, which included interim results from the titration cohort of the placebo-controlled period of the Phase 1b study as well as data from the first year of the long-term extension. The results supported the ongoing Phase 3 studies of aducanumab for early Alzheimer’s disease.
E2609
lIn October 2016 Eisai announced enrollment has commenced in MISSION AD, a Phase 3 clinical program of the beta secretase cleaving enzyme (BACE) inhibitor E2609 in patients with early Alzheimer's disease in the U.S.
Competing Product
Biosimilars (Samsung Bioepis - Biogen's Joint Venture with Samsung Biologics)
Adalimumab (SB5)
lIn July 2016 the EMA accepted Samsung Bioepis' MAA for SB5, an adalimumab biosimilar candidate referencing HUMIRA. If approved by the EC, we will manufacture and commercialize SB5 in specified E.U. countries.

Genentech Relationships
GAZYVA (obinutuzumab)
lThe Roche Group is managing GALLIUM, a Phase 3 study examining the efficacy and safety of GAZYVA plus chemotherapy followed by GAZYVA alone for up to two years, as compared head-to-head against RITUXAN plus chemotherapy followed by RITUXAN alone for up to two years. At a pre-planned interim analysis in May 2016, an independent data monitoring committee determined that the study met its primary endpoint early. The results showed GAZYVA-based treatment significantly reduced the risk of disease worsening or death (progression-free survival) compared to RITUXAN-based treatment.
 
CompetitorOCREVUS (ocrelizumab)
COPAXONE (glatiramer acetate)lIn June 2015 the Roche Group announced positive results from two Phase 3 studies evaluating OCREVUS compared with interferon beta-1a in people with relapsing forms of MS. Treatment with OCREVUS compared with interferon beta-1a significantly reduced the annualized relapse rate over a two-year period; significantly reduced the progression of clinical disability; and led to a significant reduction in the number of lesions in the brain as measured by MRI.
 
Teva Pharmaceuticals Industries Ltd.lIn September 2015 the Roche Group announced positive results from a Phase 3 study evaluating OCREVUS in people with PPMS. Treatment with OCREVUS significantly reduced the progression of clinical disability compared with placebo, as measured by the Expanded Disability Status Scale.
REBIF (interferon-beta-1) 
Merck KGaA (and co-promotedlIn June 2016 the Roche Group announced that the EMA validated its MAA of OCREVUS for the treatment of RMS and PPMS in the E.U. The FDA has also accepted for review its BLA for OCREVUS for the treatment of RMS and PPMS, and has granted the application priority review designation. Under our agreement with Pfizer Inc.Genentech, if OCREVUS is approved, we will receive tiered royalty payments on sales of OCREVUS in the U.S.)
BETASERON/BETAFERON (interferon-beta-1b)Bayer Group
EXTAVIA (interferon-beta-1b)Novartis AG
GILENYA (fingolimod)Novartis AG
AUBAGIO (teriflunomide)Sanofi
LEMTRADA (alemtuzumab)Sanofi
Competition in the MS market is intense. Along with us, a number of companies are working to develop additional treatments for MS that may in the future compete with AVONEX, PLEGRIDY, TYSABRI, TECFIDERA or all of them. In addition, the commercialization of our own products, including new products such as TECFIDERA and PLEGRIDY, and the possible future introduction of generics, related prodrug derivatives or biosimilars of existing products may negatively impact future sales of our MS products.
FAMPYRA
FAMPYRA is indicated as a treatment to improve walking in adult patients with MS who have walking disability and is the first treatment that addresses this unmet medical need with demonstrated efficacy in people with all types of MS. FAMPYRA is currently the only therapy approved to improve walking in patients with MS.
FUMADERM
FUMADERM competes with several different types of therapies in the psoriasis market within Germany, including oral systemics such as methotrexate and cyclosporine.

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RITUXAN and GAZYVA in Oncology
RITUXAN and GAZYVA compete with several different typesa number of therapies in the oncology market, including:
Competing ProductCompetitor
TREANDA (bendamustine HCL)Cephalon (Teva Pharmaceuticals)
ARZERRA (ofatumumab)GenMab in collaboration with GlaxoSmithKline
IMBRUVICA (ibrutinib)Pharmacyclics and Janssen
ZYDELIG (idelalisib)Gilead
including TREANDA (bendamustine HCL), ARZERRA (ofatumumab), IMBRUVICA (ibrutinib) and ZYDELIG (idelalisib).
We also expect that over time GAZYVA will increasingly compete with RITUXAN in the oncology market. In addition, we are aware of other anti-CD20 molecules, including biosimilars, in development that, if successfully developed and approved, may compete with RITUXAN and GAZYVA in the oncology market.
RITUXAN in Rheumatoid Arthritis (RA)
RITUXAN competes with several different types of therapies in the RArheumatoid arthritis market, including:
Competing Product/Type of TherapyCompetitor
Traditional Therapies:
Disease-modifying anti-rheumatic drugs such as steroids, methotrexate and cyclosporineNumerous competitors
TNF Inhibitors:
REMICADE (infliximab)Johnson & Johnson
SIMPONI and SIMPONI ARIA (golimumab)Johnson & Johnson
HUMIRA (adalimumab)AbbVie
ENBREL (etanercept)Amgen and Pfizer
CIMZIA (certolizumab pegol)UCB, S.A.
ORENCIA (abatacept)Bristol-Myers Squibb Company
ACTEMRA (tocilizumab)Roche Group
XELJANZ (tofacitinib)Pfizer
including, among others, traditional disease-modifying anti-rheumatic drugs such as steroids, methotrexate and cyclosporine, TNF inhibitors, ORENCIA (abatacept), ACTEMRA (tocilizumab) and XELJANZ (tofacitinib).
We are also aware of other products, including biosimilars, in development that, if successfully developed and approved, may compete with RITUXAN in the RArheumatoid arthritis market.

ELOCTATE
Research and ALPROLIXDevelopment Programs
ELOCTATEA commitment to research is fundamental to our mission. Our research efforts are focused on better understanding the underlying biology of diseases so we can discover and ALPROLIX competedeliver treatments that have the potential to make a real difference in the lives of patients with recombinant short-acting Factor VIIIhigh unmet medical needs. By applying our expertise in biologics and IXour growing capabilities in small molecule, antisense, gene therapy, gene editing and other technologies, we target specific medical needs where we believe new or better treatments are needed.
We intend to continue committing significant resources to research and development opportunities. As part of our ongoing research and development efforts, we have devoted significant resources to conducting clinical studies to advance the development of new pharmaceutical products respectively, including:and technologies and to explore the utility of our existing products in treating disorders beyond those currently approved in their labels.
The table below highlights our current research and development programs that are in clinical trials and the current phase of such programs. Drug development involves a high degree of risk and investment, and the status, timing and scope of our development programs are subject to change. Important factors that could adversely affect our drug development efforts are discussed in the “Risk Factors” section of this report.

Competing Product CandidateCollaboratorPHASE 1 CompetitorPHASE 2PHASE 3FILED
ELOCTATE:OCREVUSGenentech (Roche Group)Primary Progressive & Relapsing Multiple Sclerosis  
ADVATE [Antihemophilic Factor (Recombinant)] Baxter
KOGENATE FS [Antihemophilic Factor (Recombinant)] Bayer
HELIXATE FS [Antihemophilic Factor (Recombinant)] CSL Behring
XYNTHA [Antihemophilic Factor (Recombinant)], Plasma/Albumin-Free Pfizer
ALPROLIX:  
BENEFIX Coagulation Factor IX (Recombinant)Biosimilar adalimumabSamsung BioepisMultiple Immunology Indications in Europe Pfizer
RIXUBIS [Coagulation Factor IX (Recombinant)] Baxter
GAZYVAGenentech (Roche Group)Front-Line Indolent Non Hodgkin’s Lymphoma
AducanumabNeurimmune SubOne AGAlzheimer's Disease
E2609Eisai Co., Ltd. (Eisai)Alzheimer's Disease
BIIB074NoneTrigeminal Neuralgia
BIIB074NoneLumbosacral Radiculopathy
BIIB074NoneErythromelalgia
BAN2401EisaiAlzheimer's Disease
Opicinumab (anti-LINGO-1)NoneMultiple Sclerosis
TYSABRINoneAcute Ischemic Stroke
rAAV-XLRSAGTCX-linked Juvenile Retinoschisis
BG00011 (STX-100)NoneIdiopathic Pulmonary Fibrosis
Dapirolizumab pegolUCB PharmaLupus
BIIB059 (Anti-BDCA02)NoneLupus
BIIB061NoneMS
BIIB054NonePD*
BIIB067 (IONIS-SOD1Rx)
IonisALS**
BIIB068 (BTK Inhibitor)NoneA***��
Our hemophilia* Parkinson's Disease
** Amyotrophic Lateral Sclerosis
*** Autoimmune
For information about certain of our agreements with collaborators and other third parties, please read the subsection entitled “Business Relationships” below and Note 19, Collaborative and Other Relationships to our consolidated financial statements included in this report.

Late Stage Product Candidates
Additional information about our late stage product candidates, which includes programs in Phase 3 development or in registration stage, is set forth below.
Neurodegeneration
Aducanumab (BIIB037)
lIn September 2015 we enrolled our first patient in our two global Phase 3 studies, ENGAGE and EMERGE. ENGAGE and EMERGE will assess the efficacy and safety of aducanumab, our investigational treatment for early Alzheimer's disease, in approximately 2,700 people with early Alzheimer's disease. The studies are identical in design and eligibility criteria. Each study will be conducted in more than 20 countries in North America, Europe and Asia. In October 2015 we announced that we received FDA agreement on a special protocol assessment on the Phase 3 study protocols.
lIn June 2016 we announced that aducanumab was accepted into the European Medicines Agency's (EMA's) Priority Medicines (PRIME) program. PRIME aims to bring treatments to patients more quickly by enhancing the EMA's support for the development of investigational medicines for diseases without available treatments or in need of better treatment options.
lIn September 2016 aducanumab was granted Fast Track designation by the FDA. The FDA’s Fast Track program supports the development of new treatments for serious conditions with an unmet medical need such as Alzheimer’s disease. We also announced that in a recently completed interim analysis from our Phase 1b study of aducanumab in early Alzheimer's disease efficacy and safety data were consistent with results previously reported.
lIn December 2016 we presented new data from the Phase 1b study of aducanumab, which included interim results from the titration cohort of the placebo-controlled period of the Phase 1b study as well as data from the first year of the long-term extension. The results supported the ongoing Phase 3 studies of aducanumab for early Alzheimer’s disease.
E2609
lIn October 2016 Eisai announced enrollment has commenced in MISSION AD, a Phase 3 clinical program of the beta secretase cleaving enzyme (BACE) inhibitor E2609 in patients with early Alzheimer's disease in the U.S.
Biosimilars (Samsung Bioepis - Biogen's Joint Venture with Samsung Biologics)
Adalimumab (SB5)
lIn July 2016 the EMA accepted Samsung Bioepis' MAA for SB5, an adalimumab biosimilar candidate referencing HUMIRA. If approved by the EC, we will manufacture and commercialize SB5 in specified E.U. countries.

Genentech Relationships
GAZYVA (obinutuzumab)
lThe Roche Group is managing GALLIUM, a Phase 3 study examining the efficacy and safety of GAZYVA plus chemotherapy followed by GAZYVA alone for up to two years, as compared head-to-head against RITUXAN plus chemotherapy followed by RITUXAN alone for up to two years. At a pre-planned interim analysis in May 2016, an independent data monitoring committee determined that the study met its primary endpoint early. The results showed GAZYVA-based treatment significantly reduced the risk of disease worsening or death (progression-free survival) compared to RITUXAN-based treatment.
OCREVUS (ocrelizumab)
lIn June 2015 the Roche Group announced positive results from two Phase 3 studies evaluating OCREVUS compared with interferon beta-1a in people with relapsing forms of MS. Treatment with OCREVUS compared with interferon beta-1a significantly reduced the annualized relapse rate over a two-year period; significantly reduced the progression of clinical disability; and led to a significant reduction in the number of lesions in the brain as measured by MRI.
lIn September 2015 the Roche Group announced positive results from a Phase 3 study evaluating OCREVUS in people with PPMS. Treatment with OCREVUS significantly reduced the progression of clinical disability compared with placebo, as measured by the Expanded Disability Status Scale.
lIn June 2016 the Roche Group announced that the EMA validated its MAA of OCREVUS for the treatment of RMS and PPMS in the E.U. The FDA has also accepted for review its BLA for OCREVUS for the treatment of RMS and PPMS, and has granted the application priority review designation. Under our agreement with Genentech, if OCREVUS is approved, we will receive tiered royalty payments on sales of OCREVUS in the U.S.


Business Relationships
As part of our business strategy, we establish business relationships, including joint ventures and collaborative arrangements with other companies, universities and medical research institutions, to assist in the clinical development and/or commercialization of certain of our products and product candidates and to provide support for our research programs. We also competeevaluate opportunities for acquiring products or rights to products and technologies that are complementary to our business from other companies, universities and medical research institutions.
Below is a brief description of certain business relationships and collaborations that expand our pipeline and provide us with certain rights to existing and potential new products and technologies. For more information regarding certain of these relationships, including their ongoing financial and accounting impact on our business, please read Note 19, Collaborative and Other Relationships to our consolidated financial statements included in this report.
AbbVie, Inc.
We have a numbercollaboration agreement with AbbVie aimed at advancing the development and commercialization of plasma-derived short-acting Factor VIIIZINBRYTA in MS. Under the agreement, we and IXAbbVie conduct ZINBRYTA co-promotion activities in the U.S., E.U. and Canadian territories, and we are responsible for manufacturing and research and development activities.
Acorda Therapeutics, Inc.
We collaborate with Acorda to develop and commercialize products containing fampridine, such as FAMPYRA, in markets outside the U.S. We also have responsibility for regulatory activities and the future clinical development of related products in those markets.
Applied Genetic Technologies Corporation
We have a collaboration agreement with Applied Genetic Technologies Corporation (AGTC) to develop gene-based therapies for multiple ophthalmic diseases. The collaboration focuses on the development of a clinical-stage candidate for X-linked Retinoschisis (XLRS) and a preclinical candidate for the treatment of X-linked Retinitis Pigmentosa (XLRP), for which we were granted worldwide commercialization rights. The agreement also provides us with options to early stage discovery programs in two ophthalmic diseases and one non-ophthalmic condition.
Eisai Co., Ltd.
We have a collaboration with Eisai to jointly develop and commercialize E2609 and BAN2401, two Eisai product candidates for the treatment of Alzheimer’s disease. Eisai serves as the global operational and regulatory lead for E2609 and BAN2401 and all costs, including research, development, sales and marketing expenses, are shared equally between us and Eisai. Following marketing approval in major markets, we will co-promote E2609 and BAN2401 with Eisai and share profits equally. In smaller markets, Eisai will distribute these products and pay us a royalty.
The agreement also provides Eisai with options to jointly develop and commercialize two of our candidates for Alzheimer’s disease, aducanumab and an anti-tau monoclonal antibody, upon the exchange or provision of clinical data. Upon exercise of the applicable option, we will execute a separate collaboration agreement with Eisai on terms and conditions that mirror the financial arrangements we have with Eisai with respect to E2609 and BAN2401.
Genentech (Roche Group)
We have a collaboration agreement with Genentech which entitles us to certain financial and other rights with respect to RITUXAN, GAZYVA and other anti-CD20 product candidates. Additionally, under our agreement with Genentech, if OCREVUS is approved, we will receive tiered royalty payments on sales of OCREVUS in the U.S.
Ionis Pharmaceuticals, Inc.
We have an exclusive, worldwide option and collaboration agreement with Ionis relating to the development and commercialization of up to three gene targets, and an exclusive worldwide option and collaboration agreement with Ionis under which both companies are developing and commercializing SPINRAZA for the treatment of SMA.
We also have a six-year research collaboration agreement with Ionis, under which both companies perform discovery level research and will develop and commercialize antisense and other therapeutics for the treatment of neurological disorders.


Samsung Bioepis
We and Samsung Biologics established a joint venture, Samsung Bioepis, to develop, manufacture and market biosimilar pharmaceuticals. We also have an agreement with Samsung Bioepis to commercialize, over a 10-year term, three anti-TNF biosimilar product candidates in specified E.U. countries and, in the case of BENEPALI, Japan. Under this agreement, we are manufacturing and commercializing BENEPALI, an etanercept biosimilar referencing ENBREL and FLIXABI, an infliximab biosimilar referencing REMICADE.
In addition to our joint venture and commercialization agreement with Samsung Bioepis, we license certain of our proprietary technology to Samsung Bioepis in connection with Samsung Bioepis' development, manufacture and commercialization of its biosimilar products. We are also aware of other longer-acting products as well as other technologies, such as gene therapies, that are inprovide technical development and if successfully developedtechnology transfer services to Samsung Bioepis, and approved may competemanufacture clinical and commercial quantities of bulk drug substance of Samsung Bioepis' biosimilar products.
University of Pennsylvania
We have a collaboration and alliance with our hemophilia products.

11the University of Pennsylvania to advance gene therapy and gene editing technologies. The collaboration will primarily focus on the development of therapeutic approaches that target the eye, skeletal muscle and the central nervous system. The alliance is also expected to focus on the research and validation of next-generation gene transfer technology using adeno-associated virus gene delivery vectors and exploring the expanded use of genome editing technology as a potential therapeutic platform.


Regulatory
Our current and contemplated activities and the products, technologies and processes that will result from such activities are subject to substantial government regulation.
Regulation of Pharmaceuticals
Product Approval and Post-Approval Regulation in the United StatesU.S.
APPROVAL PROCESS
Before new pharmaceutical products may be sold in the U.S., preclinical studies and clinical trials of the products must be conducted and the results submitted to the FDA for approval. With limited exceptions, the FDA requires companies to register both pre-approval and post-approval clinical trials and disclose clinical trial results in public databases. Failure to register a trial or disclose study results within the required time periods could result in penalties, including civil monetary penalties. Clinical trial programs must establish efficacy, determine an appropriate dose and dosing regimen, and define the conditions for safe use. This is a high-risk process that requires stepwise clinical studies in which the candidate product must successfully meet predetermined endpoints. The results of the preclinical and clinical testing of a product are then submitted to the FDA in the form of a Biologics License Application (BLA)BLA or a New Drug Application (NDA).NDA. In response to a BLA or NDA, the FDA may grant marketing approval, request additional information or deny the application if it determines the application does not provide an adequate basis for approval.
Product development and receipt of regulatory approval takes a number of years, involves the expenditure of substantial resources and depends on a number of factors, including the severity of the disease in question, the availability of alternative treatments, potential safety signals observed in preclinical or clinical tests, and the risks and benefits of the product as demonstrated in clinical trials. The FDA has substantial discretion in the product approval process, and it is impossible to predict with any certainty whether and when the FDA will grant marketing approval. The agency may on occasion require the sponsor of a BLA or NDA to conduct additional clinical studies or to provide other scientific or technical information about the product, and these additional requirements may lead to unanticipated delay or expense. Furthermore, even if a product is approved, the approval may be subject to limitations based on the FDA's interpretation of the existing pre-clinical or clinical data.


The FDA has developed four distinct approaches intended to make therapeutically important drugs available as rapidly as possible, especially when the drugs are the first available treatment or have advantages over existing treatments: accelerated approval, fast track, breakthrough therapy and priority review.
Accelerated Approval: The FDA may grant “accelerated approval” status to products that treat serious or life-threatening illnesses and that provide meaningful therapeutic benefits to patients over existing treatments. Under this pathway, the FDA may approve a product based on surrogate endpoints, or clinical endpoints other than survival or irreversible morbidity. When approval is based on surrogate endpoints or clinical endpoints other than survival or morbidity, the sponsor will be required to conduct additional post-approval clinical studies to verify and describe clinical benefit. Under the agency's accelerated approval regulations, if the FDA concludes that a drug that has been shown to be effective can be safely used only if distribution or use is restricted, it may require certain post-marketing restrictions as necessary to assure safe use. In addition, for products approved under accelerated approval, sponsors may be required to submit all copies of their promotional materials, including advertisements, to the FDA at least thirty days prior to initial dissemination. The FDA may withdraw approval under accelerated approval after a hearing if, for instance, post-marketing studies fail to verify any clinical benefit, it becomes clear that restrictions on the distribution of the product are inadequate to ensure its safe use, or if a sponsor fails to comply with the conditions of the accelerated approval.
In addition, the
Fast Track Status: The FDA may grant “fast track”"fast track" status to products that treat a serious diseases or conditionscondition and fillhave data demonstrating the potential to address an unmet medical need. Fast track isneed or a process designed to expedite the review of such products by providing, among other things, more frequent meetings with the FDA to discuss the product's development plan, more frequent written correspondence from the FDA about trial design, eligibility for accelerated approval, and rolling review, which allows submission of individually completed sections ofdrug that has been designated as a NDA or BLA for FDA review before the entire filing is completed. Fast track status does not ensure that a product will be developed more quickly or receive FDA approval.qualified infectious disease product.
Breakthrough Therapy: The FDA may also grant “breakthrough therapy” status to drugs designed to treat, alone or in combination with another drug or drugs, a serious or life-threatening disease or condition and for which preliminary clinical evidence suggests a substantial improvement over existing therapies. Such drugs need not address an unmet need, but are nevertheless eligible for expedited review if they offer the potential for an improvement. Breakthrough therapy status entitles the sponsor to earlier and more frequent meetings with the FDA regarding the development of nonclinical and clinical data and permits the FDA to offer product development or regulatory advice for the purpose of shortening the time to product approval. Breakthrough therapy status does not guarantee that a product will be developed or reviewed more quickly and does not ensure FDA approval.

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Finally, the FDA may grant “priority review” statusPriority Review: Priority Review only applies to productsapplications (original or efficacy supplement) for a drug that offer major advances in treatment ortreats a serious condition and, if approved, would provide a treatment where no adequate therapy exists.significant improvement in safety or effectiveness. Priority Review may also be granted for any supplement that proposes a labeling change due to studies completed in response to a written request from FDA for pediatric studies, for an application for a drug that has been designated as a qualified infectious disease product, or any application or supplement for a drug submitted with a priority review is intended to reduce the time it takes for the FDA to review a NDA or BLA.voucher.
POST-MARKETING STUDIES
Regardless of the approval pathway employed, the FDA may require a sponsor to conduct additional post-marketing studies as a condition of approval to provide data on safety and effectiveness. If a sponsor fails to conduct the required studies, the agency may withdraw its approval. In addition, if the FDA concludes that a drug that has been shown to be effective can be safely used only if distribution or use is restricted, it can mandate post-marketing restrictions as necessary to assure safe use. In such a case, the sponsor may be required to establish rigorous systems to assure use of the product under safe conditions. These systems are usually referred to as Risk Evaluation and Mitigation Strategies (REMS). The FDA can impose financial penalties for failing to comply with certain post-marketing commitments, including REMS. In addition, any changes to an approved REMS must be reviewed and approved by the FDA prior to implementation.


ADVERSE EVENT REPORTING
We monitor information on side effects and adverse events reported during clinical studies and after marketing approval and report such information and events to regulatory agencies. Non-compliance with the FDA's safety reporting requirements may result in civil or criminal penalties. Side effects or adverse events that are reported during clinical trials can delay, impede, or prevent marketing approval. Based on new safety information that emerges after approval, the FDA can mandate product labeling changes, impose a new REMS or the addition of elements to an existing REMS, require new post-marketing studies (including additional clinical trials), or suspend or withdraw approval of the product. These requirements may affect our ability to maintain marketing approval of our products or require us to make significant expenditures to obtain or maintain such approvals.
APPROVAL OF CHANGES TO AN APPROVED PRODUCT
If we seek to make certain types of changes to an approved product, such as adding a new indication, making certain manufacturing changes, or changing manufacturers or suppliers of certain ingredients or components, the FDA will need to review and approve such changes in advance. In the case of a new indication, we are required to demonstrate with additional clinical data that the product is safe and effective for a use other than that initially approved. FDA regulatory review may result in denial or modification of the planned changes, or requirements to conduct additional tests or evaluations that can substantially delay or increase the cost of the planned changes.
In addition, theREGULATION OF PRODUCT ADVERTISING AND PROMOTION
The FDA regulates all advertising and promotion activities and communications for products under its jurisdiction both before and after approval. A company can make only those claims relating to safety and efficacy that are approved by the FDA. However, physicians may prescribe legally available drugs for uses that are not described in the drug's labeling. Such off-label uses are common across medical specialties, and often reflect a physician's belief that the off-label use is the best treatment for patients. The FDA does not regulate the behavior of physicians in their choice of treatments, but the FDA regulations do impose stringent restrictions on manufacturers' communications regarding off-label uses. Failure to comply with applicable FDA requirements may subject a company to adverse publicity, enforcement action by the FDA, corrective advertising, and the full range of civil and criminal penalties available to the FDA.government.
Regulation of Combination Products
Combination products are defined by the FDA to include products comprised ofcomprising two or more regulated components (e.g., a biologic and a device). Biologics and devices each have their own regulatory requirements, and combination products may have additional requirements. Some of our marketed products meet this definition and are regulated under this framework and similar regulations outside the U.S., and we expect that some of our pipeline product candidates may be evaluated for regulatory approval under this framework as well.
Product Approval and Post-Approval Regulation Outside the United StatesU.S.
We market our products in numerous jurisdictions outside the U.S. Most of these jurisdictions have product approval and post-approval regulatory processes that are similar in principle to those in the U.S. In Europe, for example, where mosta substantial part of our ex-U.S. efforts are focused, there are several tracks for marketing approval, depending on the type of product for which approval is sought. Under the centralized procedure, a company submits a single application to the EMA. The marketing application is similar to the NDA or BLA in the U.S. and is evaluated by the Committee for Medicinal Products for Human Use (CHMP), the expert scientific committee of the EMA. If the CHMP determines that the marketing application fulfills the requirements for quality, safety, and efficacy, it will submit a favorable opinion to the EC. The CHMP opinion is not binding, but is typically adopted by the EC. A marketing application approved by the EC is valid in all member states. The centralized procedure is required for all biological products, orphan medicinal products, and new treatments for neurodegenerative disorders, and it is available for certain other products, including those which constitute a significant therapeutic, scientific or technical innovation.

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In addition to the centralized procedure, Europe also has: (1) 
a nationalized procedure, which requires a separate application to and approval determination by each country; (2) 
a decentralized procedure, whereby applicants submit identical applications to several countries and receive simultaneous approval; and (3) 
a mutual recognition procedure, where applicants submit an application to one country for review and other countries may accept or reject the initial decision.


Regardless of the approval process employed, various parties share responsibilities for the monitoring, detection, and evaluation of adverse events post-approval, including national authorities, the EMA, the EC, and the marketing authorization holder. In some regions, it is possible to receive an “accelerated” review whereby the national regulatory authority will commit to truncated review timelines for products that meet specific medical needs.
Good Manufacturing Practices
Regulatory agencies regulate and inspect equipment, facilities and processes used in the manufacturing and testing of pharmaceutical and biologic products prior to approving a product. If, after receiving clearance from regulatory agencies, a company makes a material change in manufacturing equipment, location or process, additional regulatory review and approval may be required. We also must adhere to current Good Manufacturing Practices (cGMP) and product-specific regulations enforced by regulatory agencies following product approval. The FDA, the EMA and other regulatory agencies also conduct periodic visits to re-inspect equipment, facilities and processes following the initial approval of a product. If, as a result of these inspections, it is determined that our equipment, facilities or processes do not comply with applicable regulations and conditions of product approval, regulatory agencies may seek civil, criminal or administrative sanctions or remedies against us, including significant financial penalties and the suspension of our manufacturing operations.
Good Clinical Practices
The FDA, the EMA and other regulatory agencies promulgate regulations and standards for designing, conducting, monitoring, auditing and reporting the results of clinical trials to ensure that the data and results are accurate and that the rights and welfare of trial participants are adequately protected (commonly referred to as current Good Clinical Practices (cGCP)). Regulatory agencies enforce cGCP through periodic inspections of trial sponsors, principal investigators and trial sites, contract research organizations (CROs), and institutional review boards. If our studies fail to comply with applicable cGCP, the clinical data generated in our clinical trials may be deemed unreliable and relevant regulatory agencies may require us to perform additional clinical trials before approving our marketing applications. Noncompliance can also result in civil or criminal sanctions. We rely on third parties, including CROs, to carry out many of our clinical trial-related activities. Failure of such third parties to comply with cGCP can likewise result in rejection of our clinical trial data or other sanctions.
Approval of Biosimilars
In March 2010, U.S. healthcare reform legislation known as theThe Patient Protection and Affordable Care Act (PPACA) amended the Public Health Service Act (PHSA), to authorize the FDA to approve biological products, referred to as biosimilars or follow-on biologics, that are shown to be highly similar to previously approved biological products based upon potentially abbreviated data packages. The biosimilar must show it has no clinically meaningful differences in terms of safety and effectiveness from the reference product, and only minor differences in clinically inactive components are allowable in biosimilars products. The approval pathway for biosimilars does, however, grant a biologics manufacturer a 12 year12-year period of exclusivity from the date of approval of its biological product before biosimilar competition can be introduced. The FDA has released draft guidance documentsThere is uncertainty, however, as the approval framework for biosimilars originally was enacted as part of the implementationPPACA. In 2017, there are likely to be federal legislative and administrative efforts to repeal, substantially modify or invalidate some or all of the abbreviated approval pathway for biosimilars and these have not yet been finalized. The FDA has indicated thatprovisions of the PPACA. If the PPACA is repealed, substantially modified or invalidated, it is still evaluating a number of relevant issues, and additional guidance documents are expected to be released, including guidanceunclear what, if any, impact such action would have on the criteria for interchangeability (which the FDA has indicated would be a “higher standard” than biosimilarity), naming, labeling and clinical pharmacology.biosimilar regulation.
Biosimilars legislation has also been in place in the E.U. since 2003. In December 2012 guidelines issued by the EMA for approving biosimilars of marketed monoclonal antibody products became effective. In the E.U., biosimilars have been approved under a specialized pathway of centralized procedures. The pathway allows sponsors of a biosimilar to seek and obtain regulatory approval based in part on the clinical trial data of an innovator product to which the biosimilar has been demonstrated to be “similar”. In many cases, this allows biosimilars to be brought to market without conducting the full complement of clinical trials typically required for novel biologic drugs.

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Orphan Drug Act
Under the U.S. Orphan Drug Act, the FDA may grant orphan drug designation to drugs or biologics intended to treat a “rare disease or condition,” which generally is a disease or condition that affects fewer than 200,000 individuals in the U.S. If a product which has an orphan drug designation subsequently receives the first FDA approval for the indication for which it has such designation, the product is entitled to orphan exclusivity, i.e., the FDA may not approve any other applications to market the same drug for the same indication for a period of seven years following marketing approval, except in certain very limited circumstances, such as if the later product is shown to be clinically superior to the orphan product. Legislation similar to the U.S. Orphan Drug Act has been enacted in other countries to encourage the research, development and marketing of medicines to treat, prevent or diagnose rare diseases. In the E.U., medicinal products intended for diagnosis, prevention or treatment of life-threatening or very serious diseases affecting less than five in 10,000 people receive 10-year market exclusivity, protocol assistance and access to the centralized procedure for marketing authorization. SPINRAZA has been granted orphan drug designation in the U.S., E.U. and Japan.
Regulation Pertaining to Pricing and Reimbursement
In both domestic and foreign markets, sales of our products depend, in part, on the availability and amount of reimbursement by third partythird-party payors, including governments, and private health plans.plans and other organizations. Substantial uncertainty exists regarding the pricing reimbursement of our products, and drug prices continue to receive significant scrutiny. Governments may regulate coverage, reimbursement and pricing of our products to control cost or affect utilization of our products. Challenges to our pricing strategies, by either government or private stakeholders, could harm our business. The U.S. and foreign governments have enacted and regularly consider additional reform measures that affect health care coverage and costs. Private health plans may also seek to manage cost and utilization by implementing coverage and reimbursement limitations. Substantial uncertainty exists regarding the reimbursement by third partyOther payors, of newly approvedincluding managed care organizations, health care products. The U.S. and foreign governments regularly consider reform measures that affectinsurers, pharmacy benefit managers, government health care coverage and costs. For example, provisions of the Affordable Care Act have resulted in changes in the way health care is paid for by both governmentaladministration authorities and private health insurers, including increasedseek price discounts or rebates owed by manufacturers underin connection with the Medicaid Drug Rebate Program, annual feesplacement of our products on their formularies and, taxesin some cases, the imposition of restrictions on manufacturersaccess or coverage of certain branded prescriptionparticular drugs the requirement that manufacturers participate in a discount program for certain outpatient drugs under Medicare Part D and the expansion of the number of hospitals eligible for discounts under Section 340B of the PHSA. Such reforms have had and are expected to continue to have a significant impactor pricing determined based on our business.perceived value.
Within the U.S.
Medicaid: Medicaid is a joint federal and state program that is administered by the states for low income and disabled beneficiaries. Under the Medicaid Drug Rebate Program, we are required to pay a rebate for each unit of product reimbursed by the state Medicaid programs. For most brand name drugs, theThe amount of the basic rebate for each product is setestablished by law as the greater of 23.1% (17.1% for clotting factors and certain other products) of the average manufacturer price (AMP) or the difference between AMP and the best price available from us to any customer (with limited exceptions). The rebate amount must beis adjusted upward if AMPaverage manufacture price (AMP) increases more than inflation (measured by the Consumer Price Index - Urban). This adjustment can cause the total rebate amount to exceed the minimum 23.1% (or 17.1%) basic rebate amount. The rebate amount is calculated each quarter based on our report of current AMP and best price for each of our products to the Centers for Medicare & Medicaid Services (CMS). The requirements for calculating AMP and best price are complex. We are required to report any revisions to AMP or best price previously reported within a certain period, which revisions could affect our rebate liability for prior quarters. In addition, if we fail to provide information timely or we are found to have knowingly submitted false information to the government, the statute governing the Medicaid Drug Rebate Program provides for civil monetary penalties.
Medicare: Medicare is a federal program that is administered by the federal government that covers individuals age 65 and over as well as those with certain disabilities. Medicare Part B generally covers drugs that must be administered by physicians or other health care practitioners; are provided in connection with certain durable medical equipment; or are certain oral anti-cancer drugs and certain oral immunosuppressive drugs. In addition, clotting factors for hemophilia are typically paid under Medicare Part B. Medicare Part B pays for such drugs under a payment methodology based on the average sales price (ASP) of the drugs. Manufacturers, including us, are required to provide ASP information to the CMS on a quarterly basis. The manufacturer-submitted information is used to calculate Medicare payment rates. The current payment rate for Medicare Part B drugs is ASP plus 6%. The payment rates for drugs in the hospital outpatient setting are subject to periodic adjustment. The CMS also has the statutory authority to adjust payment rates for specific drugs outside the hospital outpatient setting based on a comparison of ASP payment rates to widely available market prices or to AMP, which could decrease Medicare payment rates, but the authority has not yet been implemented. If a manufacturer is found to have made a misrepresentation in the reporting of ASP, the governing statute provides for civil monetary penalties.
Medicare Part D provides coverage to enrolled Medicare patients for self-administered drugs (i.e., drugs that are not administered by a physician). Medicare Part D is administered by private prescription drug plans approved by the U.S. government and each drug plan establishes its own Medicare Part D formulary for prescription drug coverage and pricing, which the drug plan may modify from time-to-time. The prescription drug plans negotiate pricing with


manufacturers and pharmacies, and may condition formulary placement on the availability of manufacturer discounts. In addition, manufacturers, including us, are required to provide to CMS a 50% discount on brand name prescription drugs utilized by Medicare Part D beneficiaries when those beneficiaries reach the coverage gap in their drug benefits.

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Federal Agency Discounted Pricing: Our products are subject to discounted pricing when purchased by federal agencies via the Federal Supply Schedule (FSS). FSS participation is required for our products to be covered and reimbursed by the Veterans Administration (VA), Department of Defense, Coast Guard and Public Health Service (PHS). Coverage under Medicaid, Medicare and the PHS pharmaceutical pricing program is also conditioned upon FSS participation. FSS pricing is intended not to exceed the price that we charge our most-favored non-federal customer for a product. In addition, prices for drugs purchased by the Veterans Administration,VA, Department of Defense (including drugs purchased by military personnel and dependents through the TriCare retail pharmacy program), Coast Guard and PHS are subject to a cap on pricing equal to 76% of the non-federal average manufacturer price (non-FAMP). An additional discount applies if non-FAMP increases more than inflation (measured by the Consumer Price Index - Urban). In addition, if we fail to provide information timely or we are found to have knowingly submitted false information to the government, the governing statute provides for civil monetary penalties.
340B Discounted Pricing: To maintain coverage of our products under the Medicaid Drug Rebate Program and Medicare Part B, we are required to extend significant discounts to certain covered entities that purchase products under Section 340B of the PHS pharmaceutical pricing program. Purchasers eligible for discounts include hospitals that serve a disproportionate share of financially needy patients, community health clinics, hemophilia treatment centers and other entities that receive certain types of grants under the PHSA. For all of our products, we must agree to charge a price that will not exceed the amount determined under statute (the “ceiling price”) when we sell outpatient drugs to these covered entities. In addition, we may, but are not required to, offer these covered entities a price lower than the 340B ceiling price. The 340B discount formula is based on AMP and is generally similar to the level of rebates calculated under the Medicaid Drug Rebate Program.
Outside the U.S.
Outside the U.S., the E.U. represents oura major market. Within the E.U., our products are paid for by a variety of payors, with governments being the primary source of payment. Governments may determine or influence reimbursement of products. Governments may also set prices or otherwise regulate pricing. Negotiating prices with governmental authorities can delay commercialization of our products. Governments may use a variety of cost-containment measures to control the cost of products, including price cuts, mandatory rebates, value-based pricing, and reference pricing (i.e., referencing prices in other countries and using those reference prices to set a price). Budgetary pressures in many E.U. countries are continuing to cause governments to consider or implement various cost-containment measures, such as price freezes, increased price cuts and rebates, and expanded generic substitution and patient cost-sharing. If budget pressures continue, governments may implement additional cost-containment measures.
Regulation Pertaining to Sales and Marketing
We are subject to various federal and state laws pertaining to health care “fraud and abuse,” including anti-kickback laws and false claims laws. Anti-kickback laws generally prohibit a prescription drug manufacturer from soliciting, offering, receiving, or paying any remuneration to generate business, including the purchase or prescription of a particular drug. Although the specific provisions of these laws vary, their scope is generally broad and there may be no regulations, guidance or court decisions that clarify how the laws apply to particular industry practices. There is therefore a possibility that our practices might be challenged under the anti-kickback or similar laws. False claims laws prohibit anyone from knowingly and willingly presenting, or causing to be presented for payment to third partythird-party payors (including Medicare and Medicaid) claims for reimbursed drugs or services that are false or fraudulent, claims for items or services not provided as claimed, or claims for medically unnecessary items or services. Our activities relating to the sale and marketing of our products may be subject to scrutiny under these laws. Violations of fraud and abuse laws may be punishable by criminal or civil sanctions, including fines and civil monetary penalties, and exclusion from federal health care programs (including Medicare and Medicaid). In the U.S., federal and state authorities are paying increased attention to enforcement of these laws within the pharmaceutical industry and private individuals have been active in alleging violations of the laws and bringing suits on behalf of the government under the federal civil False Claims Act. If we were subject to allegations concerning, or were convicted of violating, these laws, our business could be harmed.

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Laws and regulations have been enacted by the federal government and various states to regulate the sales and marketing practices of pharmaceutical manufacturers. The laws and regulations generally limit financial interactions between manufacturers and health care providers or require disclosure to the government and public of such interactions. The laws include federal “sunshine” provisions enacted in 2010 as part of the comprehensive federal health care reform legislation.provisions. The sunshine provisions apply to pharmaceutical manufacturers with products reimbursed under certain government programs and require those manufacturers to disclose annually to the federal government (for re-disclosure to the public) certain payments made to physicians and certain other healthcare practitioners or to teaching hospitals. State laws may also require disclosure of pharmaceutical pricing information and marketing expenditures. Many of these laws and regulations contain ambiguous requirements. Given the lack of clarity in laws and their implementation, our reporting actions could be subject to the penalty provisions of the pertinent federal and state laws and regulations. Outside the U.S., other countries have implemented requirements for disclosure of financial interactions with healthcare providers and additional countries may consider or implement such laws.
Other Regulations
Foreign Anti-Corruption
We are subject to various federal and foreign laws that govern our international business practices with respect to payments to government officials. Those laws include the U.S. Foreign Corrupt Practices Act (FCPA), which prohibits U.S. companies and their representatives from paying, offering to pay, promising, or authorizing the payment of anything of value to any foreign government official, government staff member, political party, or political candidate for the purpose of obtaining or retaining business or to otherwise obtain favorable treatment or influence a person working in an official capacity. In many countries, the health care professionals we regularly interact with may meet the FCPA's definition of a foreign government official. The FCPA also requires public companies to make and keep books and records that accurately and fairly reflect their transactions and to devise and maintain an adequate system of internal accounting controls.
The laws to which we are subject also include the U.K. Bribery Act 2010 (Bribery Act) which proscribes giving and receiving bribes in the public and private sectors, bribing a foreign public official, and failing to have adequate procedures to prevent employees and other agents from giving bribes. U.S. companies that conduct business in the United Kingdom generally will be subject to the Bribery Act. Penalties under the Bribery Act include potentially unlimited fines for companies and criminal sanctions for corporate officers under certain circumstances.
NIH Guidelines
We seek to conduct research at our U.S. facilities in compliance with the current U.S. National Institutes of Health Guidelines for Research Involving Recombinant DNA Molecules (NIH Guidelines). By local ordinance, we are required to, among other things, comply with the NIH Guidelines in relation to our facilities in Cambridge, Massachusetts and Research Triangle Park (RTP),RTP, North Carolina and are required to operate pursuant to certain permits.
Other Laws
Our present and future business has been and will continue to be subject to various other laws and regulations. Various laws, regulations and recommendations relating to data privacy and protection, safe working conditions, laboratory practices, the experimental use of animals, and the purchase, storage, movement, import, export and use and disposal of hazardous or potentially hazardous substances, including radioactive compounds and infectious disease agents, used in connection with our research work are or may be applicable to our activities. Certain agreements entered into by us involving exclusive license rights may be subject to national or international antitrust regulatory control, the effect of which cannot be predicted. The extent of government regulation, which might result from future legislation or administrative action, cannot accurately be predicted.
Environmental Matters
We strive to comply in all material respects with applicable laws and regulations concerning the environment. While it is impossible to predict accurately the future costs associated with environmental compliance and potential remediation activities, compliance with environmental laws is not expected to require significant capital expenditures and has not had, and is not expected to have, a material adverse effect on our operations or competitive position.

17



Manufacturing
We have three licensedare committed to ensuring an uninterrupted supply of medicines to patients around the world. To that end, we continually review our manufacturing capacity, capabilities, processes and facilities. We believe that our manufacturing facilities, together with the third-party contract manufacturing organizations we outsource to, currently provide sufficient capacity for our products and the contract manufacturing services we provide to Samsung Bioepis, our joint venture that develops, manufactures and markets biosimilars, and other strategic contract manufacturing partners. In light of the development of our pipeline, we are expanding our production capacity by building a large-scale biologics manufacturing facility in Solothurn, Switzerland, which is expected to be operational by the end of the decade.
Manufacturing Facilities
Our drug substance manufacturing facilities which are locatedinclude:
FacilityDrug Substance Manufactured
RTP, North Carolina
ALPROLIX
AVONEX
ELOCTATE
PLEGRIDY
TYSABRI
ZINBRYTA
Other*
Hillerød, Denmark
TYSABRI
Biosimilars
* Other includes products manufactured for contract manufacturing partners
In addition to our drug substance manufacturing facilities, we have a drug product manufacturing facility and supporting infrastructure in RTP, North Carolina. This parenteral facility adds capabilities and capacity for filling biologics into vials.
We also lease from Eisai an oral solid dose products manufacturing facility in RTP, North Carolina, Cambridge, Massachusetts,where we manufacture TECFIDERA and Hillerød, Denmark. The RTP site includesother oral solid dose products, including products for Eisai. This facility supplements our outsourced small molecule manufacturing capabilities. Under our lease arrangement, Eisai may provide us with packaging services for oral solid dose products. In August 2015 we agreed to purchase this facility following the expiration of our current three-year lease in the third quarter of 2018 and Eisai's completion of certain activities.
For a 105,000 square foot biologics manufacturing facility, which contains 6,000 (3 x 2,000) litersperiod of bioreactor capacity, as well as a 175,000 square foot Large-Scale Manufacturing (LSM) plant which contains 90,000 (6 x 15,000) literstime following the spin-off of bioreactor capacity. The Cambridge site is a 67,000 square foot biologics manufacturing facility that contains 10,000 (5 x 2,000) liters of bioreactor capacity. The Hillerød site is a 228,000 square foot LSM plant that contains 90,000 (6 x 15,000) liters of bioreactor capacity.
We rely on our manufacturing facilities in Cambridge, Massachusetts, RTP, North CarolinaBioverativ, we agreed to manufacture and Hillerød, Denmarksupply, exclusively for the production ofBioverativ, drug substance, for certain of our large molecule productsdrug product and finished goods with respect to ELOCTATE and ALPROLIX and pipeline product candidates.
Genentech is responsible for all worldwide manufacturing activities for bulk RITUXAN and GAZYVA and has sourced the manufacture of certain bulk RITUXAN and GAZYVA requirements to a third party. party, Acorda Therapeutics supplies FAMPYRA to us pursuant to its supply agreement with Alkermes, Inc. and Ionis supplies the active pharmaceutical ingredient (API) for SPINRAZA.
Third-Party Suppliers and Manufacturers
We principally use third parties to manufacture the active pharmaceutical ingredient (API)API, except as noted above for SPINRAZA, and, to a lesser extent, the final product for our small molecule products and product candidates, including TECFIDERA and FUMADERM and the final drug product for our large molecule products and product candidates. Acorda Therapeutics supplies FAMPYRA to us pursuant to its supply agreement with Alkermes, Inc.
In December 2012, we entered into an arrangement with Eisai to lease a portion of their facility in RTP to manufacture oral solid dose products supplementing our outsourced small molecule manufacturing capabilities. That facility also manufactures oral solid dose products for Eisai. As part of that arrangement, Eisai may provide us with packaging services for oral solid dose products. In December 2014, we submitted an application to the FDA to approve the manufacture of TECFIDERA 240 mg drug product at this facility. We intend to continue to utilize third party contract manufacturing organizations to manufacture the API and final product for our small molecule products and product candidates, which we intend to supplement through our internal oral solid dose manufacturing capabilities.including SPINRAZA.
We source all of our fill-finish and the majority of final product assembly and storage operations for our products, along with a substantial part of our packaging operations, to a concentrated group of third partythird-party contract manufacturing organizations. We have internal label and packaging capability for clinical and commercial products at our Cambridge and Hillerød facilities.facility. Raw materials, delivery devices, such as syringes and auto-injectors, and other supplies required for the production of our products and product candidates are procured from various third partythird-party suppliers and manufacturers in quantities adequate to meet our needs. Continuity of supply of such raw materials, devices and supplies is assured using a strategy of dual sourcing where possible or by a risk-based inventory strategy. Our third partythird-party service providers, suppliers and manufacturers may be subject to routine cGMP inspections by the FDA or comparable agencies in other jurisdictions and undergo assessment and certification by our quality management group.

We believe that our manufacturing facilities, together with the third party contract manufacturing organizations we outsource to, currently provide sufficient capacity for our products. We provide contract manufacturing services to Samsung Bioepis, a related party that develops, manufactures and markets biosimilars. We intend to continue to monitor the sufficiency of our manufacturing capacity in light of the development of our product pipeline.
Our Employees
As of December 31, 2014,2016, we had approximately 7,5507,400 employees worldwide.
Our Executive Officers (as of February 4, 2015)2, 2017)
George A. Scangos, Ph.D., 66, is our Chief Executive Officer and has served in this position since July 2010. From 1996 to July 2010, Dr. Scangos served as the President and Chief Executive Officer of Exelixis, Inc., a drug discovery and development company, where he continues to serve on the board. From 1993 to 1996, Dr. Scangos served as President of Bayer Biotechnology, where he was responsible for research, business development, process development, manufacturing, engineering and quality assurance of Bayer’s biological products. Before joining Bayer in 1987, Dr. Scangos was a professor of biology at Johns Hopkins University for six years, where he is still an adjunct professor. Dr. Scangos served as non-executive Chairman of Anadys Pharmaceuticals, Inc., a biopharmaceutical company, from 2005 to July 2010 and was a director of the company from 2003 to July 2010. He also served as the Chair of the California Healthcare Institute in 2010 and was a member of the board of the Global Alliance for TB Drug Development until 2010. Dr. Scangos is Treasurer of the Board of Directors of Pharmaceutical Research and Manufacturers of America (PhRMA), a member of the Boards of Trustees of the Boston Museum of Science and the Biomedical Science Careers Program, and a member of the National Board of Visitors of the University of California, Davis School of Medicine. Dr. Scangos is also on the Board of Directors of Agilent Technologies, Inc., a provider of bioanalytical and electronic measurement solutions. Dr. Scangos received his B.A. in Biology from Cornell University and Ph.D. in Microbiology from the University of Massachusetts, and was a Jane Coffin Childs Post-Doctoral Fellow at Yale University.

Officer Current Position Age Year Joined Biogen
Michel Vounatsos Chief Executive Officer 55 2016
Susan H. Alexander Executive Vice President, Chief Legal Officer and Corporate Secretary 60 2006
Paul J. Clancy Executive Vice President, Finance and Chief Financial Officer 55 2001
Gregory F. Covino Vice President, Finance and Chief Accounting Officer 51 2012
Michael D. Ehlers Executive Vice President, Research and Development 48 2016
Paul McKenzie Executive Vice President, Pharmaceutical Operations and Technology 51 2016
Kenneth DiPietro Executive Vice President, Human Resources 58 2012
Adriana (Andi) Karaboutis Executive Vice President, Technology, Business Solutions and Corporate Affairs 54 2014
Alfred W. Sandrock, Jr., M.D., Ph.D. Chief Medical Officer and Executive Vice President of Neurology Discovery and Development 59 1998
18

Michel Vounatsos
Experience
Mr. Vounatsos has served as our Chief Executive Officer since January 2017. Prior to that, from April 2016 to December 2016, Mr. Vounatsos served as our Executive Vice President and Chief Commercial Officer. Prior to joining Biogen, Mr. Vounatsos spent 20 years at Merck where he most recently served as President, Primary Care, Customer Business Line. In this role, he led Merck’s global primary care business unit, a role which encompassed Merck’s cardiology-metabolic, general medicine, women’s health and biosimilars groups and developed and instituted a strategic framework for enhancing the company’s relationships with key constituents, including the most significant providers, payers and retailers and the world’s largest governments. Mr. Vounatsos previously held leadership positions across Europe and in China for Merck. Prior to that, Mr. Vounatsos held management positions at Ciba-Geigy.
Education
lUniversite Victor Segalen, Bordeaux II, France, C.S.C.T. Certificate in Medicine
lHEC School of Management - Paris, M.B.A.

Susan H. Alexander, 58, is our Executive Vice President, Chief Legal Officer and Corporate Secretary and has served in these positions since December 2011. Prior to that, from 2006 to December 2011, Ms. Alexander served as our Executive Vice President, General Counsel and Corporate Secretary. From 2003 to January 2006, Ms. Alexander served as the Senior Vice President, General Counsel and Corporate Secretary of PAREXEL International Corporation, a biopharmaceutical services company. From 2001 to 2003, Ms. Alexander served as General Counsel of IONA Technologies, a software company. From 1995 to 2001, Ms. Alexander served as Counsel at Cabot Corporation, a specialty chemicals and performance materials company. Prior to that, Ms. Alexander was a partner at the law firms of Hinckley, Allen & Snyder and Fine & Ambrogne. Ms. Alexander received her B.A. from Wellesley College and her J.D. from Boston University School of Law.
Susan H. Alexander
Experience
Ms. Alexander has served as our Executive Vice President, Chief Legal Officer and Corporate Secretary since December 2011. Prior to that, from 2006 to December 2011, Ms. Alexander served as our Executive Vice President, General Counsel and Corporate Secretary. From 2003 to January 2006, Ms. Alexander served as the Senior Vice President, General Counsel and Corporate Secretary of PAREXEL International Corporation, a biopharmaceutical services company. From 2001 to 2003, Ms. Alexander served as General Counsel of IONA Technologies, a software company. From 1995 to 2001, Ms. Alexander served as Counsel at Cabot Corporation, a specialty chemicals and performance materials company. Prior to that, Ms. Alexander was a partner at the law firms of Hinckley, Allen & Snyder and Fine & Ambrogne.
Public Company Boards
lBoard of Directors of Invacare Corporation, a medical and healthcare product company
Education
lWellesley College, B.A
lBoston University School of Law, J.D.
Spyros Artavanis-Tsakonas, Ph.D., 68, is our Senior Vice President, Chief Scientific Officer and has served in this position since May 2013. Prior to his appointment in May 2013, Dr. Artavanis-Tsakonas served as our interim Chief Scientific Officer while on sabbatical from Harvard Medical School from March 2012 to May 2013. Dr. Artavanis-Tsakonas has been a Professor of Cell Biology at the Harvard Medical School since 1999. Prior to that, from 1999 through 2012, he was Professor, Collège de France, serving as Chair of Biology and Genetics of Development, and from 1999 to 2007, he was also the K.J. Isselbacher- P. Schwartz Professor at the Massachusetts General Hospital Cancer Center and Director of Developmental Biology and Cancer at the Harvard Medical School. Dr. Artavanis-Tsakonas is the scientific co-founder of Exelixis Pharmaceuticals, Inc., a drug discovery and development company, Cellzome, a drug discovery and development company, and Anadys Pharmaceuticals, Inc., a biopharmaceutical company. Dr. Artavanis-Tsakonas obtained his M.Sc. in Chemistry from the Federal Institute of Technology, Zurich and a Ph.D. in Molecular Biology from the University of Cambridge, England. His postdoctoral research was completed at Biozentrum, University of Basel and Stanford University.
Paul J. Clancy, 53, is our Executive Vice President, Finance and Chief Financial Officer and has served in these positions since August 2007. Mr. Clancy joined Biogen, Inc. in 2001 and has held several senior executive positions with us, including Vice President of Business Planning, Portfolio Management and U.S. Marketing, and Senior Vice President of Finance with responsibilities for leading the Treasury, Tax, Investor Relations and Business Planning groups. Prior to that, he spent 13 years at PepsiCo, a food and beverage company, serving in a range of financial and general management positions. Mr. Clancy serves on the board of directors of Agios Pharmaceuticals, Inc. and Incyte Corporation, both biopharmaceutical companies. Mr. Clancy received his B.S. in Finance from Babson College and M.B.A. from Columbia University.
Gregory F. Covino, 49, is our Vice President, Finance and Chief Accounting Officer and has served in this position since April 2012. Prior to that, Mr. Covino served at Boston Scientific Corporation, a medical device company, as Vice President, Corporate Analysis and Control since March 2010, having responsibility for the company's internal audit function, and as Vice President, Finance, International from February 2008 to March 2010, having responsibility for the financial activities of the company's international division. Prior to that, Mr. Covino held several finance positions at Hubbell Incorporated, an electrical products company, including Vice President, Chief Accounting Officer and Controller from 2002 to January 2008, Interim Chief Financial Officer from 2004 to 2005, and Director, Corporate Accounting from 1999 to 2002. Mr. Covino received his B.S. in Business Administration from Bryant University.
Paul J. Clancy
Experience
Mr. Clancy has served as our Executive Vice President, Finance and Chief Financial Officer since August 2007. Mr. Clancy joined Biogen, Inc. in 2001 and has held several senior executive positions with us, including Vice President of Business Planning, Portfolio Management and U.S. Marketing, and Senior Vice President of Finance with responsibilities for leading the Treasury, Tax, Investor Relations and Business Planning groups. Prior to that, he spent 13 years at PepsiCo, a food and beverage company, serving in a range of financial and general management positions.
Public Company Boards
lBoard of Directors of Agios Pharmaceuticals, Inc., a biopharmaceutical company
lBoard of Directors of Incyte Corporation, a biopharmaceutical company
Education
lBabson College, B.S. in Finance
lColumbia University, M.B.A.
John G. Cox, 52, is our Executive Vice President, Pharmaceutical Operations and Technology and has served in this position since June 2010. Mr. Cox joined Biogen, Inc. in 2003 and has held several senior executive positions with us, including Senior Vice President of Technical Operations, Senior Vice President of Global Manufacturing, and Vice President of Manufacturing and General Manager of Biogen Idec’s operations in RTP. Prior to that, Mr. Cox held a number of senior operational roles at Diosynth Inc., a life sciences manufacturing and services company, where he worked in technology transfer, validation and purification. Prior to that, Mr. Cox focused on the same areas at Wyeth Corporation, a life sciences company, from 1993 to 2000. Mr. Cox serves on the board of directors of Repligen Corporation, a life sciences company. Mr. Cox received his B.S. in Biology from Arizona State University, M.B.A. from the University of Michigan and M.S. in Cell Biology from California State University.
Kenneth Di Pietro, 56, is our Executive Vice President, Human Resources and has served in this position since January 2012. Mr. Di Pietro joined Biogen Idec from Lenovo Group, a technology company, where he served as Senior Vice President, Human Resources from 2005 to June 2011. From 2003 to 2005, he served as Corporate Vice President, Human Resources at Microsoft Corporation, a technology company. From 1999 to 2002, Mr. Di Pietro worked as Vice President, Human Resources at Dell Inc., a technology company. Prior to that, he spent 17 years at PepsiCo, a food and beverage company, serving in a range of human resource and general management positions. Mr. DiPietro serves on the board of directors of InVivo Therapeutics Corporation, a medical device company. Mr. Di Pietro received his B.S. in Industrial and Labor Relations from Cornell University.
Gregory F. Covino
Experience
Mr. Covino has served as our Vice President, Finance and Chief Accounting Officer since April 2012. Prior to that, Mr. Covino served at Boston Scientific Corporation, a medical device company, as Vice President, Corporate Analysis and Control since March 2010, having responsibility for the company's internal audit function, and as Vice President, Finance, International from February 2008 to March 2010, having responsibility for the financial activities of the company's international division. Prior to that, Mr. Covino held several finance positions at Hubbell Incorporated, an electrical products company, including Vice President, Chief Accounting Officer and Controller from 2002 to January 2008, Interim Chief Financial Officer from 2004 to 2005, and Director, Corporate Accounting from 1999 to 2002.
Education
lBryant University, B.S. in Business Administration

19

Michael D. Ehlers
Experience
Dr. Ehlers has served as our Executive Vice President, Head of R&D since May 2016. Prior to joining Biogen, Dr. Ehlers served in leadership positions at Pfizer, Inc., including Senior Vice President & Head BioTherapeutics R&D and Chief Scientific Officer, Neuroscience & Pain. Prior to that, Dr. Ehlers was the George Barth Geller Professor of Neurobiology and an Investigator of the Howard Hughes Medical Institute at Duke University Medical Center. He is the recipient of numerous awards including the Eppendorf & Science Prize in Neurobiology, the John J. Abel Award in Pharmacology, the Society for Neuroscience Young Investigator Award, a National Institute of Mental Health MERIT Award, the National Alliance for Schizophrenia and Depression Distinguished Investigator Award, and the Massachusetts Medical Society Honored Business Leader Award. In 2013, Dr. Ehlers became the 11th recipient of the Thudichum Medal of the Biochemical Society of the United Kingdom. Past recipients include two Nobel laureates. Dr. Ehlers has authored over 100 scientific papers, has served on the Editorial Boards of Annual Reviews in Medicine, Annual Reviews in Pharmacology and Toxicology, the Journal of Neuroscience, the Journal of Biological Chemistry, the Journal of Molecular and Cellular Neuroscience, and has sat on advisory committees of the National Institutes of Health.
Outside Affiliations
lPhRMA Foundation Basic Pharmacology Advisory Committee
lJanelia Research Institute Advisory Committee
lMcKnight Endowment Fund for Neuroscience Board
lWorld Economic Forum Global Agenda Council on Brain Research
Education
lCalifornia Institute of Technology, B.S. Chemistry
lThe John Hopkins University School of Medicine, M.D.
lThe John Hopkins University School of Medicine, Ph.D. Neuroscience


Steven H. Holtzman, 60, is our Executive Vice President, Corporate Development and has served in this position since January 2011. Prior to that, Mr. Holtzman was a founder of Infinity Pharmaceuticals, Inc., a drug discovery and development company, where he served as Chair of the Board of Directors from company inception in 2001 to November 2012, Executive Chair of the Board of Directors in 2010 and as Chief Executive Officer from 2001 to December 2009. From 1994 to 2001, Mr. Holtzman was Chief Business Officer at Millennium Pharmaceuticals Inc., a biopharmaceutical company. From 1986 to 1994, he was a founder, member of the Board of Directors and Executive Vice President of DNX Corporation, a biotechnology company. From 1996 to 2001, Mr. Holtzman served as presidential appointee to the national Bioethics Advisory Commission. Mr. Holtzman received his B.A. from Michigan State University and B.Phil. graduate degree from Oxford University which he attended as a Rhodes Scholar.
Paul McKenzie
Experience
Dr. McKenzie has served as our Executive Vice President, Pharmaceutical Operations and Technology since July 2016. Prior to that, from February 2016 to June 2016, he served as our Senior Vice President for Global Biologics Manufacturing & Technical Operations. Prior to joining Biogen, since 2008, Dr. McKenzie held a number of positions of increasing responsibility at Johnson & Johnson (J&J), including Vice President of R&D for J&J’s Ethicon business where he led the manufacturing and technical operations team responsible for internal and external manufacturing of Janssen’s pharmaceutical portfolio. He also ran global Development for Janssen R&D, helping to manage pipeline activities from discovery through clinical development and commercialization. Prior to J&J, Dr. McKenzie also held various R&D and manufacturing positions at Bristol-Myers Squibb and Merck & Co.
Education
lUniversity of Pennsylvania, B.S. Chemical Engineering
lCarnegie Mellon University, Ph.D. Chemical Engineering
Adriana (Andi) Karaboutis, 52, is our Executive Vice President, Technology and Business Solutions and has served in this position since September 2014. Prior to joining us, Ms. Karaboutis was Vice President and Global Chief Information Officer of Dell, Inc., where she was responsible for leading a global IT organization focused on powering Dell as an end-to-end technology solutions provider. Prior to joining Dell in 2010, Ms. Karaboutis spent over 20 years at General Motors and Ford Motor Company in various international leadership positions including computer-integrated manufacturing, supply chain operations, and information technology. Ms. Karaboutis serves on the board of directors of Advance Auto Parts, an automotive after market parts provider. Ms. Karaboutis received a B.S. in Computer Science from Wayne State University in Detroit, Michigan.
Tony Kingsley, 51, is our Executive Vice President, Global Commercial Operations and has served in this position since November 2011. From January 2010 to November 2011, Mr. Kingsley served as our Senior Vice President, U.S. Commercial Operations. Prior to that, he served as Senior Vice President and General Manager of the Gynecological Surgical Products business at Hologic, Inc., a provider of diagnostic and surgical products, from October 2007 to November 2009, and as Division President, Diagnostic Products at Cytyc Corp., a provider of diagnostic and medical device products, from July 2006 to October 2007. In those roles, Mr. Kingsley ran commercial, manufacturing and research and development functions. From 1991 to 2006, he was a Partner at McKinsey & Company focusing on the biotechnology, pharmaceutical and medical device industries. Mr. Kingsley received his B.A. in Government from Dartmouth College and M.B.A. from Harvard Graduate School of Business Administration.
Kenneth DiPietro
Experience
Mr. DiPietro has served as our Executive Vice President, Human Resources since January 2012. Mr. DiPietro joined Biogen from Lenovo Group, a technology company, where he served as Senior Vice President, Human Resources from 2005 to June 2011. From 2003 to 2005, he served as Corporate Vice President, Human Resources at Microsoft Corporation, a technology company. From 1999 to 2002, Mr. DiPietro worked as Vice President, Human Resources at Dell Inc., a technology company. Prior to that, he spent 17 years at PepsiCo, a food and beverage company, serving in a range of human resource and general management positions.
Public Company Boards
lBoard of Directors of InVivo Therapeutics Corporation, a medical device company
Education
lCornell University, B.S. in Industrial and Labor Relations
Adam Koppel, M.D., Ph.D., 45, is our Senior Vice President and Chief Strategy Officer, responsible for leading corporate strategy and portfolio management, and has served in this position since May 2014. Prior to joining us, Dr. Koppel served as a Managing Director of Brookside Capital, the public-equity affiliate of Bain Capital, since November 2003. Prior to Brookside Capital, he served as Associate Principal with McKinsey & Company, where he consulted to companies in the pharmaceutical and biotechnology industries. Dr. Koppel serves on the board of directors of PTC Therapeutics, Inc. and Trevena, Inc., both biopharmaceutical companies. Dr. Koppel received an M.D. and Ph.D. from the University of Pennsylvania School of Medicine, an M.B.A. from the Wharton School of the University of Pennsylvania and a B.A. from Harvard University.
Alfred W. Sandrock, Jr., M.D., Ph.D., 57, is our Group Senior Vice President, Chief Medical Officer and has served in this position since May 2013. From February 2012 to April 2013, Dr. Sandrock served as our Senior Vice President, Chief Medical Officer. Prior to that, Dr. Sandrock held several senior executive positions since joining us in 1998, including Senior Vice President of Development Sciences, Senior Vice President of Neurology Research and Development and Vice President of Clinical Development, Neurology. Dr. Sandrock received his B.A. in Human Biology from Stanford University, an M.D. from Harvard Medical School, and a Ph.D. in Neurobiology from Harvard University. He completed an internship in Medicine, a residency and chief residency in Neurology, and a clinical fellowship in Neuromuscular Disease and Clinical Neurophysiology (electromyography) at Massachusetts General Hospital.
Adriana (Andi) Karaboutis
Experience
Ms. Karaboutis has served as our Executive Vice President, Technology, Business Solutions and Corporate Affairs since December 2015 and prior to that served as our Executive Vice President, Technology and Business Solutions since joining Biogen in September 2014. Prior to that, Ms. Karaboutis was Vice President and Global Chief Information Officer of Dell, Inc., where she was responsible for leading a global IT organization focused on powering Dell as an end-to-end technology solutions provider. Prior to joining Dell in 2010, Ms. Karaboutis spent over 20 years at General Motors and Ford Motor Company in various international leadership positions including computer-integrated manufacturing, supply chain operations, and information technology.
Public Company Boards
lBoard of Directors of Advance Auto Parts, an automotive aftermarket parts provider
Education
lWayne State University, B.S. in Computer Science

20

Alfred W. Sandrock, Jr., M.D., Ph.D.
Experience
Dr. Sandrock has served as our Chief Medical Officer and Executive Vice President of Neurology Discovery and Development since November 2015. Prior to that, Dr. Sandrock served as our Chief Medical Officer and Group Senior Vice President from May 2013 to October 2015, and as our Chief Medical Officer and Senior Vice President of Development Sciences from February 2012 to April 2013. Prior to that, Dr. Sandrock held several senior executive positions since joining us in 1998, including Senior Vice President of Neurology Research and Development and Vice President of Clinical Development, Neurology.
Public Company Boards
lBoard of Directors of Neurocrine Biosciences, Inc., a life sciences company
Education
lStanford University, B.A. in Human Biology
lHarvard Medical School, M.D.
lHarvard University, Ph.D. in Neurobiology
lMassachusetts General Hospital, internship in Medicine, residency and chief residency in Neurology, and clinical fellowship in Neuromuscular Disease and Clinical Neurophysiology (electromyography)

Douglas E. Williams, Ph.D., 56, is our Executive Vice President, Research and Development and has served in this position since January 2011. Prior to that, Dr. Williams held several senior executive positions at ZymoGenetics, Inc., a biopharmaceutical company, including Chief Executive Officer and Director, from January 2009 to October 2010; President and Chief Scientific Officer, from July 2007 to January 2009; and Executive Vice President, Research and Development and Chief Scientific Officer, from 2004 to July 2007. Prior to that, he held leadership positions within the biotechnology industry, including Chief Scientific Officer and Executive Vice President of Research and Development at Seattle Genetics, Inc., a biotechnology company, from 2003 to 2004, and Senior Vice President and Washington Site Leader at Amgen Inc., a biotechnology company, in 2002. Dr. Williams also served in a series of scientific and senior leadership positions during a decade at Immunex Corp., a biopharmaceutical company, including Executive Vice President and Chief Technology Officer, Senior Vice President of Discovery Research, Vice President of Research and Development, and as a director. Prior to that, Dr. Williams served on the faculty of the Indiana University School of Medicine and the Department of Laboratory Medicine at the Roswell Park Memorial Institute, in Buffalo, New York. Dr. Williams serves on the boards of directors of Regulus Therapeutics Inc. and Ironwood Pharmaceuticals, both life sciences companies. Dr. Williams received his B.S. in biological sciences from the University of Massachusetts, Lowell and Ph.D. in physiology from the State University of New York at Buffalo, Roswell Park Memorial Institute Division.
Available Information
Our principal executive offices are located at 225 Binney Street, Cambridge, MA 02142 and our telephone number is (617) 679-2000. Our website address is www.biogenidec.com.www.biogen.com. We make available free of charge through the Investors section of our website our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and all amendments to those reports as soon as reasonably practicable after such material is electronically filed with or furnished to the Securities and Exchange Commission (SEC). We include our website address in this report only as an inactive textual reference and do not intend it to be an active link to our website. The contents of our website are not incorporated into this report.


21Item  1A.     Risk Factors


Item  1A.
Risk Factors
We are substantially dependent on revenues from our principal products.
Our current revenues depend upon continued sales of our principal products, TECFIDERA, AVONEX, TYSABRI, and, RITUXAN. Weunless we develop or acquire rights to new products and technologies, we may be substantially dependent on sales from our principal products for many years, including an increasing relianceyears. Further, following the completion of the spin-off of our hemophilia business, our revenues will be further reliant and concentrated on sales of our MS products in an increasingly competitive market, and growthrevenue from sales of TECFIDERA as we continue to expand into additional markets.our product for spinal muscular atrophy. Any of the following negative developments relating to any of theseour principal products including the following, and as discussed in greater detail in these “Risk Factors”, may adversely affect our revenues and results of operations or could cause a decline in our stock price:
safety or efficacy issues;
the introduction or greater acceptance of competing products;
constraints and additional pressures on product pricing or price increases, due to a number of factors, including those resulting from governmental or regulatory requirements, increased competition, or changes in, or implementation of, reimbursement policies and practices of payors and other third parties; or
adverse legal, administrative, regulatory or legislative developments.
SPINRAZA was recently approved by the FDA, and is in the early stages of commercial launch. In addition to risks associated with new product launches and the other factors described in these “Risk Factors”, our ability to successfully commercialize SPINRAZA may be adversely affected due to:
our limited marketing experience within the spinal muscular atrophy market, which may impact our ability to develop relationships with the associated medical and scientific community;
the lack of readiness of healthcare providers to treat patients with spinal muscular atrophy;
the effectiveness of our commercial strategy for marketing SPINRAZA; and
our ability to maintain a positive reputation among patients, healthcare providers and others in the spinal muscular atrophy community, which may be impacted by pricing and reimbursement decisions relating to SPINRAZA.
If we fail to compete effectively, our business and market position would suffer.
The biopharmaceutical industry and the markets in which we operate are intensely competitive. We compete in the marketing and sale of our products, the development of new products and processes, the acquisition of rights to new products with commercial potential and the hiring and retention of personnel. We compete with biotechnology and pharmaceutical companies that have a greater number of products on the market and in the product pipeline, greater financial and other resources and other technological or competitive advantages. One or more of our competitors may benefit from significantly greater sales and marketing capabilities, may develop products that are accepted more widely than ours or may receive patent protection that dominates, blocks or adversely affects our product development or business.
Our products are also susceptible to competition from generics and biosimilars in many markets. Generic versions of drugs and biosimilars are likely to be sold at substantially lower prices than branded products. Accordingly, the introduction of generic or biosimilar versions of our marketed products likely would significantly reduce both the price that we receive for such marketed products and the volume of products that we sell, which may have an adverse impact on our results of operations.
In the MS market, we face intense competition as the number of products and competitors continues to expand. Due to our significant reliance on sales of our MS products, our business may be harmed if we are unable to successfully compete in the MS market. More specifically, our ability to compete, and maintain and grow our share in the MS market may be adversely affected due to a number of factors, including:
the introduction of more efficacious, safer, less expensive or more convenient alternatives to our MS products, including our own products;products and products of our collaborators;
the introduction of lower-cost biosimilars, follow-on products or generic versions of branded MS products sold by our competitors, and the possibility of future competition from generic versions or related prodrug derivativesprodrugs of existing therapeutics or from off-label use by physicians of therapies indicated for other conditions to treat MS patients;

patient dynamics, including the size of the patient population and our ability to attract new patients to our therapies;
damage to physician and patient confidence in any of our MS products or to our sales and reputation as a result of label changes or adverse experiences or events that may occur with patients treated with our MS products;
inability to obtain appropriate pricing and reimbursement for our MS products compared to our competitors in key international markets; or
our ability to obtain and maintain patent, data or market exclusivity for our MS products.
Similarly, the hemophilia treatment market is highly competitive, with current treatments marketed by companies that have substantially greater financial resources and marketing expertise. Our ability to successfully compete in the hemophilia market and gain share in this market may be adversely affected due to a number of reasons, including:
difficulty in penetrating this market if our therapies are not regarded as offering substantial benefits over current treatments;

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the introduction by other companies of longer-lasting or more efficacious, safer, less expensive or more convenient treatments than our therapies;
our limited marketing experience within the hemophilia treatment market, which may impact our ability to develop well-established relationships with the associated medical and scientific community;
our failure to receive positive pediatric data from our ongoing global pediatric studies, which is required for filing our planned MAA for ALPROLIX with the EMA; or
if one of several companies that are working to develop additional treatments for hemophilia obtains marketing approval of its treatment in the E.U. before we do, our application with the EMA could be barred under operation of the EMA’s Orphan Medicines Regulation.
If we are unable to obtain and maintain adequate protection for our data, intellectual property and other proprietary rights, our business may be harmed.
Our success depends in part on our ability to obtain and defend patent and other intellectual property rights that are important to the commercialization of our products and product candidates. The degree of patent protection that will be afforded to our products and processes in the U.S. and in other important markets remains uncertain and is dependent upon the scope of protection decided upon by the patent offices, courts and lawmakers in these countries. We can provide no assurance that we will successfully obtain or preserve patent protection for the technologies incorporated into our products and processes, or that the protection obtained will be of sufficient breadth and degree to protect our commercial interests in all countries where we conduct business. If we cannot prevent others from exploiting our inventions, we will not derive the benefit from them that we currently expect. Furthermore, we can provide no assurance that our products will not infringe patents or other intellectual property rights held by third parties.
We also rely on regulatory exclusivity for protection of our products. Implementation and enforcement of regulatory exclusivity, which may consist of regulatory data protection and market protection, varies widely from country to country. Failure to qualify for regulatory exclusivity, or failure to obtain or maintain the extent or duration of such protections that we expect in each of the markets for our products, could affect our revenue for our products or our decision on whether to market our products in a particular country or countries or could otherwise have an adverse impact on our results of operations.
Litigation, interference, oppositions or other proceedings have been and may in the future be necessary in some instances to determine the validity and scope of certain of our proprietary rights, and in other instances to determine the validity, scope or non-infringement of certain patent rights claimed by third parties to be pertinent to the manufacture, use or sale of our products. We may also face challenges to our patent and regulatory protections covering our products by manufacturers of generics and biosimilars that may choose to launch or attempt to launch their products before the expiration of our patent or regulatory exclusivity. Litigation, interference, oppositions or other similar types of proceedings are unpredictable and may be protracted, expensive and distracting to management. The outcome of such proceedings could adversely affect the validity and scope of our patent or other proprietary rights, hinder our ability to manufacture and market our products, require us to seek a license for the infringed product or technology or result in the assessment of significant monetary damages against us that may exceed amounts, if any, accrued in our financial statements. An adverse determination in a judicial or administrative proceeding or a failure to obtain necessary licenses could prevent us from manufacturing or selling our products. Furthermore, payments under any licenses that we are able to obtain would reduce our profits derived from the covered products and services.

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Sales of our products depend, to a significant extent, on adequate coverage, pricing and reimbursement from third partythird-party payors, which are subject to increasing and intense pressure from political, social, competitive and other sources. Our inability to maintain adequate coverage, or a reduction in pricing or reimbursement, could have an adverse effect on our business, revenues and results of operations and could cause a decline in our stock price.
Sales of our products are dependent, in large part, on the availability and extent of coverage, pricing and reimbursement from government health administration authorities, private health insurers and other organizations,organizations. When a new pharmaceutical product is approved, the availability of government and drug prices are under significant scrutiny inprivate reimbursement for that product may be uncertain, as is the markets wherepricing and amount for which that product will be reimbursed.
Pricing and reimbursement for our products are prescribed. may be adversely affected by a number of factors, including:
changes in, and implementation of, federal, state or foreign government regulations or private third-party payors' reimbursement policies;
pressure by employers on private health insurance plans to reduce costs; and
consolidation and increasing assertiveness of payors, including managed care organizations, health insurers, pharmacy benefit managers, government health administration authorities, private health insurers and other organizations, seeking price discounts or rebates in connection with the placement of our products on their formularies and, in some cases, the imposition of restrictions on access or coverage of particular drugs or pricing determined based on perceived value.
Our ability to set the price for our products can vary significantly from country to country and as a result so can the price of our products, and we may continueproducts. Certain countries set prices by reference to face increasing pressure to lower the prices forin other countries where our products are marketed. Thus, our inability to secure adequate prices in many markets. Changes in government regulations or private third-party payors' reimbursement policies, as well as pressure by employers on private health insurance plans to reduce costs,a particular country may reduce pricing and reimbursement fornot only limit the revenue from our products andwithin that country, but may also adversely affect our future results. In addition, whenability to obtain acceptable prices in other markets. This may create the opportunity for third-party cross-border trade or influence our decision to sell or not to sell a new medical product, is approved, the availability of governmentthus adversely affecting our geographic expansion plans and private reimbursement for that product is uncertain, as is the pricing and amount for which that product will be reimbursed. We also cannot predict the availability, pricing or amount of reimbursement for our product candidates. revenues.
Our failure to maintain adequate coverage, pricing, or reimbursement for our products would have an adverse effect on our business, revenues and results of operation,operations, could curtail or eliminate our ability to adequately fund research and development programs for the discovery and commercialization of new products and could cause a decline in our stock price.
Drug prices are under significant scrutiny in the markets in which our products are prescribed. We expect drug pricing and other health care costs to continue to be subject to intense political and societal pressures on a global basis. As a result, our business and reputation may be harmed, our stock price may be adversely impacted and experience periods of volatility, and our results of operations may be adversely impacted. 

Our results of operations may be adversely affected by current and potential future healthcare reforms.
In the U.S., federal and state legislatures, health agencies and third-party payors continue to focus on containing the cost of health care. Legislative and regulatory proposals and enactments to reform health care insurance programs could significantly influence the manner in which our products are prescribed and purchased. For example, provisions of the PPACA have resulted in changes in the way health care is paid for by both governmental and private insurers, including increased rebates owed by manufacturers under the Medicaid Drug Rebate Program, annual fees and taxes on manufacturers of certain branded prescription drugs, the requirement that manufacturers participate in a discount program for certain outpatient drugs under Medicare Part D and the expansion of the number of hospitals eligible for discounts under Section 340B of the Public Health Service Act. These changes have had and are expected to continue to have a significant impact on our business.
Managed care organizations continue In 2017, we may face uncertainties as a result of likely federal and administrative efforts to seek price discountsrepeal, substantially modify or invalidate some or all of the provisions of the PPACA. There is no assurance that the PPACA, as currently enacted or as amended in the future, will not adversely affect our business and in some cases,financial results, and we cannot predict how future federal or state legislative or administrative changes relating to impose restrictions on the coverage of particular drugs. For example, health insurers, pharmacy benefit managers and other payors may seek price discounts or rebates in connection with the placement ofhealthcare reform will affect our products on their formularies. They could also impose restrictions on access to our products, and could even choose to exclude coverage of our products entirely.business.
There is also significant economic pressure on state budgets that may result in states increasingly seeking to achieve budget savings through mechanisms that limit coverage or payment for our drugs. In recent years, some states have considered legislation and ballot initiatives that would control the prices of drugs, including laws to allow importation of pharmaceutical products from lower cost jurisdictions outside the U.S. and laws intended to impose price controls on state drug purchases. State Medicaid programs are increasingly requesting manufacturers to pay supplemental rebates and requiring prior authorization by the state program for use of any drug for which supplemental rebates are not being paid. Government efforts to reduce Medicaid expenses may lead to increased use of managed care organizations by Medicaid programs. This may result in managed care organizations influencing prescription decisions for a larger segment of the population and a corresponding constraint on prices and reimbursement for our products. In addition, under the PPACA, as states implement their health care marketplaces or operate under the federal exchange, the impact on drug manufacturers, including us, will depend in part on the formulary and benefit design decisions made by insurance sponsors or plans participating in these programs. It is possible that we may need to provide discounts or rebates to such plans in order to maintain favorable formulary access for our products for this patient population, which could have an adverse impact on our sales and results of operations.
In the European UnionE.U. and some other international markets, the government provides health care at low cost to consumers and regulates pharmaceutical prices, patient eligibility or reimbursement levels to control costs for the government-sponsored health care system. Many countries have announced or implemented measures to reduce health care costs to constrain their overall level of government expenditures. These measures vary by country and may include, among other things, patient access restrictions, suspensions on price increases, prospective and possibly retroactive price reductions and other recoupments and increased mandatory discounts or rebates, recoveries of past price increases and greater importation of drugs from lower-cost countries to higher-cost countries. These measures have negatively impacted our revenues, and may continue to adversely affect our revenues and results of operations in the future. In addition, certain countries set prices by reference to the prices in other countries where our products are marketed. Thus, our inability to secure adequate prices in a particular country may not only limit the marketing of our products within that country, but may also adversely affect our ability to obtain acceptable prices in other markets. This may create the opportunity for third party cross-border trade or influence our decision to sell or not to sell a product, thus adversely affecting our geographic expansion plans and revenues.

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Adverse safety events or restrictions on use and safety warnings for our products can negatively affect our business, product sales and stock price.
Adverse safety events involving our marketed products may have a negative impact on our business. Discovery of safety issues with our products could create product liability and could cause additional regulatory scrutiny and requirements for additional labeling or safety monitoring, withdrawal of products from the market and the imposition of fines or criminal penalties. Adverse safety events may also damage physician and patient confidence in our products and our reputation. Any of these could result in liabilities, loss of revenue, material write-offs of inventory, material impairments of intangible assets, goodwill and fixed assets, material restructuring charges and other adverse impacts on our results of operations.
Regulatory authorities are making greater amounts of stand-alone safety information directly available to the public through periodic safety update reports, patient registries and other reporting requirements. The reporting of adverse safety events involving our products or products similar to ours and public rumors about such events may increase claims against us and may also cause our product sales or stock price to decline or experience periods of volatility.
Restrictions on use or significant safety warnings that may be required to be included in the label of our products, such as the risk of developing progressive multifocal leukoencephalopathy (PML), a serious brain infection, in the label for TYSABRI and in the U.S. label for TECFIDERA,certain of our products, may significantly reduce expected revenues for those products and require significant expense and management time.

If we are unable to obtain and maintain adequate protection for our data, intellectual property and other proprietary rights, our business may be harmed.
Our success depends in part on our ability to obtain and defend patent and other intellectual property rights that are important to the commercialization of our products and product candidates. The degree of patent protection that will be afforded to our products and processes in the U.S. and in other important markets remains uncertain and is dependent upon the scope of protection decided upon by the patent offices, courts, administrative bodies and lawmakers in these countries. We can provide no assurance that we will successfully obtain or preserve patent protection for the technologies incorporated into our products and processes, or that the protection obtained will be of sufficient breadth and degree to protect our commercial interests in all countries where we conduct business. If we cannot prevent others from exploiting our inventions, we will not derive the benefit from them that we currently expect. Furthermore, we can provide no assurance that our products will not infringe patents or other intellectual property rights held by third parties.
We also rely on regulatory exclusivity for protection of our products. Implementation and enforcement of regulatory exclusivity, which may consist of regulatory data protection and market protection, varies widely from country to country. Failure to qualify for regulatory exclusivity, or failure to obtain or maintain the extent or duration of such protections that we expect in each of the markets for our products due to challenges, changes or interpretations in the law or otherwise, could affect our revenue for our products or our decision on whether to market our products in a particular country or countries or could otherwise have an adverse impact on our results of operations.
Litigation, interferences, oppositions, inter partes reviews or other proceedings are, have been and may in the future be necessary in some instances to determine the validity and scope of certain of our proprietary rights, and in other instances to determine the validity, scope or non-infringement of certain patent rights claimed by third parties to be pertinent to the manufacture, use or sale of our products. We may also face challenges to our patent and regulatory protections covering our products by third parties, including manufacturers of generics and biosimilars that may choose to launch or attempt to launch their products before the expiration of our patent or regulatory exclusivity. Litigation, interference, oppositions, inter partes reviews, administrative challenges or other similar types of proceedings are unpredictable and may be protracted, expensive and distracting to management. The outcome of such proceedings could adversely affect the validity and scope of our patent or other proprietary rights, hinder our ability to manufacture and market our products, require us to seek a license for the infringed product or technology or result in the assessment of significant monetary damages against us that may exceed amounts, if any, accrued in our financial statements. An adverse determination in a judicial or administrative proceeding or a failure to obtain necessary licenses could prevent us from manufacturing or selling our products. Furthermore, payments under any licenses that we are able to obtain would reduce our profits derived from the covered products and services.
Our long-term success depends upon the successful development license or acquisition of new products and additional indications for existing products.
Our long-term viability and growth will depend upon thesuccessful development of additional indications for our existing products as well as successful development of new products and technologies from our research and development activities, including those licensed or acquired from third parties andour biosimilars developed through our joint venture with Samsung Biologics and approval of additional indications for our existing products. The sustainability of growth in our business is dependent in part upon our ability to continue to build a strong early and mid-stage pipeline of product candidates in our core competencies as well as additional areas of unmet need. or licenses or acquisitions from third parties.
Product development is very expensive and involves a high degree of risk. Only a small number of research and development programs result in the commercialization of a product. SuccessClinical trials may indicate that our product candidates lack efficacy, have harmful side effects, result in unexpected adverse events or raise other concerns that may significantly reduce the likelihood of regulatory approval. This may result in terminated programs, significant restrictions on use and safety warnings in an approved label, adverse placement within the treatment paradigm, or significant reduction in the commercial potential of the product candidate.
Clinical trials and the development of biopharmaceutical products is a lengthy and complex process. If we fail to adequately manage our clinical activities, our clinical trials or potential regulatory approvals may be delayed or denied.
Conducting clinical trials is a complex, time-consuming and expensive process. Our ability to complete clinical trials in a timely fashion depends in large part on a number of key factors. These factors include protocol design, regulatory and institutional review board approval, patient enrollment rates and compliance with extensive current Good Clinical Practices. If we or our third-party clinical trial providers or third-party contract research organizations (CROs) do not successfully carry out these clinical activities, our clinical trials or the potential regulatory approval of a product candidate may be delayed or be unsuccessful.

We have opened clinical sites and are enrolling patients in a number of countries where our experience is more limited. In most cases, we use the services of third parties to carry out our clinical trial related activities and rely on such parties to accurately report their results. Our reliance on third parties for these activities may impact our ability to control the timing, conduct, expense and quality of our clinical trials. One CRO has responsibility for a substantial portion of our clinical trial related activities and reporting. If this CRO does not adequately perform, many of our trials may be affected. We may need to replace our CROs. Although we believe there are a number of other CROs we could engage to continue these activities, the replacement of an existing CRO may result in the delay of the affected trials or otherwise adversely affect our efforts to obtain regulatory approvals and commercialize our product candidates.
Successful preclinical work or early stage clinical trials do not ensure success in later stage trials, regulatory approval or commercial viability of a product.
Positive results in a trial may not be replicated in subsequent or confirmatory trials. Additionally, success in preclinical work or early stage clinical trials does not ensure that later stage or larger scale clinical trials will be successful or that regulatory approval will be obtained. Further, it is possible that we may experience delays, uncertainties or difficulties developing biosimilars as the legislative and regulatory pathways for approval of biosimilars continue to evolve in many markets.
Conducting clinical trials is a complex, time-consuming and expensive process. Our ability to complete our clinical trials in a timely fashion depends in large part on a number of key factors including protocol design, regulatory and institutional review board approval, patient enrollment rates, and compliance with extensive current Good Clinical Practices. We have opened clinical sites and are enrolling patients in a number of countries where our experience is more limited. In most cases, we use the services of third party clinical trial providers and third party contract research organizations, or CROs, to carry out most of our clinical trial related activities and accurately report their results, which may impact our ability to control the timing, conduct, expense and quality of our clinical trials. One CRO has responsibility for substantially all of our clinical trial related activities and reporting. If our CROs do not successfully carry out their activities or meet expected deadlines, our trials may be delayed. We may also need to replace our CROs. Although we believe that there are a number of other third-party CROs we could engage to continue these activities, the replacement of an existing CRO may result in delay of the affected trials or otherwise adversely affect our efforts to obtain regulatory approvals and commercialize our drug candidates.
If we fail to adequately manage the design, execution and regulatory aspects of our large, complex and diverse clinical trials, our studies and any potential regulatory approvals may be delayed, or we may fail to gain approvals for our product candidates. Clinical trials may indicate that our product candidates lack efficacy, have harmful side effects or raise safety or other concerns that may significantly reduce the likelihood of regulatory approval, result in significant restrictions on use and safety warnings in the approved label, adversely affect placement within the treatment paradigm, or otherwise significantly diminish the commercial potential of the product candidate. Also, positive results in a registrational trial may not be replicated in any subsequent confirmatory trials. Evenaddition, even if later stage clinical trials are successful, regulatory authorities may delay or decline approval of our product candidates. Regulatory authorities may disagree with our view of the data, or require additional studies mayor disagree with our trial design or the endpoints employed in the trials,endpoints. Regulatory authorities may also fail to approve the facilities or the processes used to manufacture a product candidate, may fail to approve or delay approval of our product candidates, dosing or delivery methods or companion devices ordevices. Regulatory authorities may otherwise grant marketing approval that is more restricted than anticipated, includinganticipated. These restrictions may include limiting indications coveringto narrow patient populations and the imposition of safety monitoring, or educational requirements orand risk evaluation and mitigation strategies. The occurrence of any suchof these events could result in the incurrence of significant costs and expenses, have an adverse effect on our business, including our financial condition and results of operations orand cause our stock price to decline or experience periods of volatility.

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Even if we are able to successfully develop new products or indications, wesales of new products or products with additional indications may not meet investor expectations. We may also make a strategic decision to discontinue development of sucha product or indication if, for example, we believe commercialization will be difficult relative to the standard of care or other opportunities in our pipeline.
We dependManagement and key personnel changes may disrupt our operations, and we may have difficulty retaining key personnel or attracting and retaining qualified replacements on relationships with collaboratorsa timely basis for management and other third-parties for product and royalty revenue, andkey personnel who may leave the development, commercialization and marketing of certain products, which are outside of our full control.Company.
We rely on a numberhave experienced changes in management and other key personnel in critical functions across our organization, including our chief executive officer, and heads of significant collaborative relationships for productresearch and royalty revenue,development and pharmaceutical operations and technology. Changes in management and other key personnel have the development, commercialization,potential to disrupt our business, and marketing of certain of our products and product candidates. Reliance on collaborative relationships subjects us to a number of risks, including:
we may be unable to control the resources our collaborator devotes to our programs or products;
disputes may arise with respect to ownership of rights to technology developed with our collaboration partner, and the underlying contract with our collaborator may fail to provide significant protection or may fail to be effectively enforced if the collaborator fails to perform;
our collaborators’ interests may not always be aligned with our interests and they may not market a product in the same manner or to the same extent that we would, whichany such disruption could adversely affect our revenues;
collaborations often require the parties to cooperate,operations, programs, growth, financial condition and failure to do so effectively could adversely affect product sales by our collaborators or the clinical development or regulatory approvalsresults of products under joint control or could result in terminationoperations. Further, new members of the research, development or commercialization of product candidates or result in litigation or arbitration; and
any failure on the part of our collaborators to comply with applicable laws and regulatory requirements in the marketing, sale and maintenance of the market authorization of our products or to fulfill any responsibilities theymanagement may have different perspectives on programs and opportunities for our business, which may cause us to protect and enforce any intellectual property rights underlying our products could have an adverse effectfocus on new business opportunities or reduce or change emphasis on our revenuesexisting business programs.
Our success is dependent upon our ability to attract and retain qualified management and key personnel in a highly competitive environment. Qualified individuals are in high demand, and we may incur significant costs to attract them, particularly at the executive level. We may face difficulty in attracting and retaining key talent for a number of reasons, such as well as involve us in possible legal proceedings.
Given these risks, there is considerable uncertainty regardingmanagement changes, the successunderperformance or discontinuation of one or more late stage programs or recruitment by competitors. We cannot assure that we will be able to hire or retain the personnel necessary for our currentoperations or that the loss of any such personnel will not have a material impact on our financial condition and future collaborative efforts. If these efforts fail, our product development or commercializationresults of new products could be delayed or revenues from products could decline.operations.
Manufacturing issues could substantially increase our costs, limit supply of our products and reduce our revenues.
The process of manufacturing our products is complex, highly regulated and subject to numerous risks, including:
Risk of Product Loss.The manufacturing process for our products is extremely susceptible to product loss due to contamination, oxidation, equipment failure or improper installation or operation of equipment, or vendor or operator error. Even minor deviations from normal manufacturing processes could result in reduced production yields, product defects and other supply disruptions. If microbial, viral or other contaminations are discovered in our products or manufacturing facilities, we may need to close our manufacturing facilities for an extended period of time to investigate and remediate the contaminant.

Risks of Reliance on Third Parties and Single Source Providers.We rely on third partythird-party suppliers and manufacturers for among other things: manufacturing of RITUXAN and GAZYVA; the majoritymany aspects of our clinical and commercial requirementsmanufacturing process for TECFIDERA and other small moleculeour products and product candidates; raw materials and supplies for production of products we manufacture; delivery devices such as syringes and auto-injectors; drug product and fill-finish operations; the majority of our final product storage; and a substantial portion of our packaging operations.candidates. In addition,some cases, due to the unique manner in which our products are manufactured, we rely on single source providers of several raw materials and manufacturing supplies. These third parties are independent entities subject to their own unique operational and financial risks that are outside of our control. These third parties may not perform their obligations in a timely and cost-effective manner or in compliance with applicable regulations, and they may be unable or unwilling to increase production capacity commensurate with demand for our existing or future products. Finding alternative providers could take a significant amount of time and involve significant expense due to the specialized nature of the services and the need to obtain regulatory approval of any significant changes to our suppliers or manufacturing methods. We cannot be certain that we could reach agreement with alternative providers or that the FDA or other regulatory authorities would approve our use of such alternatives.
Global Bulk Supply Risks.We rely on our principal manufacturing facilities in Cambridge, Massachusetts, RTP, North Carolina and Hillerød, Denmark for the production of drug substance for certain of our large molecule products and product candidates, including AVONEX, TYSABRI, PLEGRIDY, ZINBRYTA, ALPROLIX and ELOCTATE.candidates. Our global bulk supply of these products and product candidates depends on the uninterrupted and efficient operation of these facilities, which could be adversely affected by equipment failures, labor shortages, natural disasters, power failures and numerous other factors.

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Risks Relating to Compliance with cGMP.We and our third partythird-party providers are generally required to maintain compliance with current Good Manufacturing PracticescGMP and other stringent requirements and are subject to inspections by the FDA and comparable agencies in other jurisdictions to confirm such compliance. Any delay, interruption or other issues that arise in the manufacture, fill-finish, packaging or storage of our products as a result of a failure of our facilities or the facilities or operations of third parties to pass any regulatory agency inspection could significantly impair our ability to develop and commercialize our products. Significant noncompliance could also result in the imposition of monetary penalties or other civil or criminal sanctions and damage our reputation.
Any adverse developments affecting our manufacturing operations or the operations of our third-party suppliers and manufacturers may result in shipment delays, inventory shortages, lot failures, product withdrawals or recalls or other interruptions in the commercial supply of our products. We may also have to take inventory write-offs and incur other charges and expenses for products that fail to meet specifications, undertake costly remediation efforts or seek more costly manufacturing alternatives. Such developments could increase our manufacturing costs, cause us to lose revenue or market share as patients and physicians turn to competing therapeutics, diminish our profitability or damage our reputation.
While we believe we currently have sufficient manufacturing capacity to meetWe depend on relationships with collaborators and other third-parties for revenue, and the development, regulatory approval, commercialization and marketing of certain products, which are outside of our near-term manufacturing requirements, it is probable that we would need additional manufacturing capacity to support future clinicalfull control.
We rely on a number of significant collaborative relationships for revenue, and commercial manufacturing requirements for product candidates in our pipeline, if such candidates are successfulthe development, regulatory approval, commercialization and approved. Due to the long lead times necessary for the expansionmarketing of manufacturing capacity, it is possible that we may incur significant costs to build or acquire additional facilities or obtain third party contract manufacturers in advancecertain of product demand and sales. If we are unable to adequately and timely manufacture and supply our products and product candidates,candidates. We also outsource to third parties certain aspects of our businessregulatory affairs and clinical development relating to our products and product candidates. Reliance on collaborative and other third-party relationships subjects us to a number of risks, including:
we may be harmed.unable to control the resources our collaborators or third parties devote to our programs or products;
disputes may arise under the agreement, including with respect to the achievement and payment of milestones or ownership of rights to technology developed with our collaborators or other third parties, and the underlying contract with our collaborators or other third parties may fail to provide significant protection or may fail to be effectively enforced if the collaborators or third parties fail to perform;
the interests of our collaborators or third parties may not always be aligned with our interests, such parties may not pursue regulatory approvals or market a product in the same manner or to the same extent that we would, which could adversely affect our revenues;
third-party relationships and collaborations often require the parties to cooperate, and failure to do so effectively could adversely affect product sales, or the clinical development or regulatory approvals of products under joint control or could result in termination of the research, development or commercialization of product candidates or result in litigation or arbitration; and

any failure on the part of our collaborators or other third parties to comply with applicable laws and regulatory requirements in the marketing, sale and maintenance of the marketing authorization of our products or to fulfill any responsibilities our collaborators or other third parties may have to protect and enforce any intellectual property rights underlying our products could have an adverse effect on our revenues as well as involve us in possible legal proceedings.
Given these risks, there is considerable uncertainty regarding the success of our current and future collaborative efforts. If these efforts fail, our product development or commercialization of new products could be delayed or revenues from products could decline.
Our business may be adversely affected if we do not manage our current growth and do not successfully execute our growth initiatives.
We have experienced significantanticipate growth in our headcount and operations, which has placed, and will continue to place, significant demands on our management and our operational and financial infrastructure. We anticipate further growth through both internal development projects, as well ascommercial initiatives and external opportunities, which may include the acquisition, partnering and in-licensing of products, technologies and companies or the entry into strategic alliances and collaborations. While we believe we have a number of promising programs in our pipeline, failure of internal development projects to advance or difficulties in executing on our commercial initiatives could impact our current and future growth, resulting in additional reliance on external development opportunities for growth. The availability of high quality, cost-effective development opportunities is limited and competitive, and we are not certain that we will be able to identify candidates that we and our shareholders consider suitable or complete transactions on terms that are acceptable to us and our shareholders. In orderWe may fail to pursue such opportunities,complete transactions for other reasons, including if we may require significant additionalare unable to obtain desired financing which may not be available to us on favorable terms, if at all. Even if we are able to successfully identify and complete acquisitions and other strategic alliances and collaborations, we may face unanticipated costs or liabilities in connection with the transaction or we may not be able to integrate them or take full advantage of them or otherwise realize the benefits that we expect.
To manage our current and future potential growth effectively, we need to continue to enhance our operational, financial and management processes and to expand, train and manage our employee base. Our growth is also dependent upon our ability to attract and retain qualified scientific, information technology, manufacturing, sales and marketing and executive personnel and to develop and maintain relationships with qualified clinical researchers and key distributors in a highly competitive environment. Supporting our growth initiatives and the further development of our existing products and potential new products in our pipeline will require significant capital expenditures and management resources, including investments in research and development, sales and marketing, manufacturing capabilities and other areas of our business. If we do not successfully manage our current growth and do not successfully execute our growth initiatives, then our business and financial results may be adversely affected and we may incur asset impairment or restructuring charges.
We may incur operational difficulties or be exposed to claims and liabilities as a result of the separation and distribution of Bioverativ.
On February 1, 2017, we distributed all of the then outstanding shares of Bioverativ common stock to Biogen stockholders in connection with the separation of our hemophilia business. In connection with the distribution, we entered into a separation and distribution agreement and various other agreements (including a transition services agreement, a tax matters agreement, a manufacturing and supply agreement, an employee matters agreement, an intellectual property matters agreement and certain other commercial agreements). These agreements govern the separation and distribution and the relationship between the two companies going forward, including with respect to potential tax-related losses associated with the separation and distribution. They also provide for the performance of services by each company for the benefit of the other for a period of time (including under the manufacturing and supply agreement pursuant to which we will manufacture and supply certain products and materials to Bioverativ).
There could be significant liability if the separation and distribution is determined to be a taxable transaction. Bioverativ has agreed to indemnify us for certain potential liabilities that may arise, but we cannot guarantee that Bioverativ will be able to satisfy its indemnification obligations.
The separation and distribution agreement provides for indemnification obligations designed to make Bioverativ financially responsible for many liabilities that may exist relating to its business activities, whether incurred prior to or after the distribution, including any pending or future litigation. It is possible that a court would disregard the allocation agreed to between us and Bioverativ and require us to assume responsibility for obligations allocated to Bioverativ. Third parties could also seek to hold us responsible for any of these liabilities or obligations, and the indemnity rights we have under the separation and distribution agreement may not be sufficient to fully cover all of these liabilities and obligations. Even if we are successful in obtaining indemnification, we may have to bear costs temporarily. In addition, our indemnity obligations to Bioverativ may be significant. These risks could negatively affect our business, financial condition or results of operations.

The separation of Bioverativ continues to involve a number of risks, including, among other things, the indemnification risks described above and the potential that management’s and our employees’ attention will be significantly diverted by the provision of transitional services. Certain of the agreements described above provide for the performance of services by each company for the benefit of the other for a period of time. If Bioverativ is unable to satisfy its obligations under these agreements, including its indemnification obligations, we could incur losses. These arrangements could also lead to disputes over rights to certain shared property and over the allocation of costs and revenues for products and operations. Our inability to effectively manage the separation activities and related events could adversely affect our business, financial condition or results of operations.
We may not achieve some or all of the expected benefits of the separation and distribution, and such events may adversely affect our business.
We may not be able to achieve the full strategic and financial benefits expected to result from the separation and distribution, or such benefits may be delayed or not occur at all. If we fail to achieve some or all of the expected benefits of the separation, or if such benefits are delayed, our business, financial condition, results of operations and the value of our stock could be adversely impacted.
A breakdown or breach of our technology systems could subject us to liability or interrupt the operation of our business.
We are increasingly dependent upon technology systems and data. Our computer systems continue to increase in multitude and complexity due to the growth in our business, making them potentially vulnerable to breakdown, malicious intrusion and random attack. Likewise, data privacy or security breaches by individuals authorized to access our technology systems or others may pose a risk that sensitive data, including intellectual property, trade secrets or personal information belonging to us, our patients, customers or other business partners, may be exposed to unauthorized persons or to the public. Cyber-attacks are increasing in their frequency, sophistication and intensity, and are becoming increasingly difficult to detect. They are often carried out by motivated, well-resourced, skilled and persistent actors including nation states, organized crime groups and "hacktivists." Cyber-attacks could include the deployment of harmful malware and key loggers, a denial-of-service attack, a malicious website, the use of social engineering and other means to affect the confidentiality, integrity and availability of our technology systems and data. Our key business partners face similar risks and any security breach of their systems could adversely affect our security posture. While we continue to build and improve our systems and infrastructure and believe we have taken appropriate security measures to reduce these risks to our data and information technology systems, there can be no assurance that our efforts will prevent breakdowns or breaches in our systems that could adversely affect our business and operations and/or result in the loss of critical or sensitive information, which could result in financial, legal, business or reputational harm to us. In addition, our liability insurance may not be sufficient in type or amount to cover us against claims related to security breaches, cyber-attacks and other related breaches.
If we fail to comply with the extensive legal and regulatory requirements affecting the health care industry, we could face increased costs, penalties and a loss of business.
Our activities, and the activities of our collaborators, distributors and other third partythird-party providers, are subject to extensive government regulation and oversight both in the U.S. and in foreign jurisdictions. The FDA and comparable agencies in other jurisdictions directly regulate many of our most critical business activities, including the conduct of preclinical and clinical studies, product manufacturing, advertising and promotion, product distribution, adverse event reporting and product risk management. Our interactions in the U.S. or abroad with physicians and other health care providers that prescribe or purchase our products are also subject to government regulation designed to prevent fraud and abuse in the sale and use of the products and place greater restrictions on the marketing practices of health care companies. Health care companies such as ours are facing heightened scrutiny of their relationships with health care providers from anti-corruption enforcement officials. In addition, we along with many other pharmaceutical and biotechnologyhealth care companies such as ours have been the target of lawsuits and investigations alleging violations of government regulation, including claims asserting submission of incorrect pricing information, impermissible off-label promotion of pharmaceutical products, payments intended to influence the referral of health care business, submission of false claims for government reimbursement, antitrust violations or violations related to

27


environmental matters. These risksThere is also enhanced scrutiny of company-sponsored patient assistance programs, including insurance premium and co-pay assistance programs and donations to third party charities that provide such assistance. If we, or our vendors or donation recipients, are deemed to fail to comply with relevant laws, regulations or government guidance in the operation of these programs, we could be subject to significant fines or penalties. Risks relating to compliance with laws and regulations may be heightened as we continue to expand our global operations and introduce additional products to the market.enter new therapeutic areas with different patient populations, which may have different product distribution methods, marketing programs or patient assistance programs from those we currently utilize or support.

Regulations governing the health care industry are subject to change, with possibly retroactive effect, including:
new laws, regulations or judicial decisions, or new interpretations of existing laws, regulations or decisions, related to health care availability, pricing or marketing practices, compliance with wage and hour laws and other employment practices, method of delivery, payment for health care products and services, compliance with health information and data privacy and security laws and regulations, tracking and reporting payments and other transfers of value made to physicians and teaching hospitals, extensive anti-bribery and anti-corruption prohibitions, product serialization and labeling requirements and used product take-back requirements;
changes in the FDA and foreign regulatory approval processes that may delay or prevent the approval of new products and result in lost market opportunity;
requirements that provide for increased transparency of clinical trial results and quality data, such as the EMA’s recently enacted clinical transparency policy, which could impact our ability to protect trade secrets and competitively-sensitive information contained in approval applications or could be misinterpreted leading to reputational damage, misperception or legal action which could harm our business; and
changes in FDA and foreign regulations that may require additional safety monitoring, labeling changes, restrictions on product distribution or use, or other measures after the introduction of our products to market, which could increase our costs of doing business, adversely affect the future permitted uses of approved products, or otherwise adversely affect the market for our products.
Examples of previously enacted and possible future changes in laws that could adversely affect our business include the enactment in the U.S. of health care reform, potential regulations easing the entry of competing biosimilars in the marketplace, new legislation or implementation of existing statutory provisions on importation of lower-cost competing drugs from other jurisdictions, enhanced penalties for and investigations into non-compliance with U.S. fraud and abuse laws, and compliance with the Physician Payment Sunshine Act in the U.S. and similar foreign rules and regulations that require collection and reporting of payments or other transfers of value made to physicians and teaching hospitals.
Violations of governmental regulation may be punishable by criminal and civil sanctions against us, including fines and civil monetary penalties and exclusion from participation in government programs, including Medicare and Medicaid, as well as against executives overseeing our business. In addition to penalties for violation of laws and regulations, we could be required to repay amounts we received from government payors, or pay additional rebates and interest if we are found to have miscalculated the pricing information we have submitted to the government. We cannot ensure that our compliance controls, policies and procedures will in every instance protect us from acts committed by our employees, collaborators, partners or third-party providers that would violate the laws or regulations of the jurisdictions in which we operate. Whether or not we have complied with the law, an investigation into alleged unlawful conduct could increase our expenses, damage our reputation, divert management time and attention and adversely affect our business.
A breakdown or breachOur effective tax rate may fluctuate and we may incur obligations in tax jurisdictions in excess of accrued amounts.
As a global biopharmaceutical company, we are subject to taxation in numerous countries, states and other jurisdictions. As a result, our effective tax rate is derived from a combination of applicable tax rates in the various places that we operate. In preparing our financial statements, we estimate the amount of tax that will become payable in each of such places. Our effective tax rate, however, may be different than experienced in the past due to numerous factors, including changes in the mix of our information technology systemsprofitability from country to country, the results of examinations and audits of our tax filings, adjustments to the value of our uncertain tax positions, changes in accounting for income taxes and changes in tax laws. Any of these factors could subjectcause us to liabilityexperience an effective tax rate significantly different from previous periods or interruptour current expectations.
In addition, our inability to secure or sustain acceptable arrangements with tax authorities and future changes in the operationtax laws, among other things, may result in tax obligations in excess of amounts accrued in our financial statements.
In the U.S., there are several proposals under consideration to reform tax law, including proposals that may reduce or eliminate the deferral of U.S. income tax on our unrepatriated earnings, penalize certain transfer pricing structures, and reduce or eliminate certain foreign or domestic tax credits or deductions. Our future reported financial results may be adversely affected by tax law changes which restrict or eliminate certain foreign tax credits or our ability to deduct expenses attributable to foreign earnings, or otherwise affect the treatment of our business.unrepatriated earnings.
We are increasingly dependent upon information technology systemsIn addition to U.S. tax reform proposals, the adoption of some or all of the recommendations set forth in the Organization for Economic Co-operation and data. Development’s project on “Base Erosion and Profit Shifting” (BEPS) by tax authorities in the countries in which we operate, could negatively impact our effective tax rate. These recommendations focus on payments from affiliates in high tax jurisdictions to affiliates in lower tax jurisdictions and the activities that give rise to a taxable presence in a particular country.

Our computer systems continue to increase in multitude and complexity due to the growth in our business, making them potentially vulnerable to breakdown, malicious intrusion and random attack. Likewise, data privacy or security breaches by individuals authorized to access our information technology systems or others may pose a risk that sensitive data, including intellectual property, trade secrets or personal information belonging to us, our patients, customers or other business partners, may be exposed to unauthorized persons or to the public. Cyber-attacks are increasing in their frequency, sophistication and intensity. While we continue to build and improve our information systems and infrastructure and believe we have taken appropriate security measures to minimize these risks to our data and information technology systems, there can be no assurance that our efforts will prevent breakdowns or breaches in our systems thatindebtedness could adversely affect our business and limit our ability to plan for or respond to changes in our business.
Our indebtedness, together with our significant contingent liabilities, including milestone and royalty payment obligations, could have important consequences to our business; for example, such obligations could:
increase our vulnerability to general adverse economic and industry conditions;
limit our ability to access capital markets and incur additional debt in the future;
require us to dedicate a substantial portion of our cash flow from operations to payments on our indebtedness, thereby reducing the availability of our cash flow for other purposes, including business development efforts, research and development and mergers and acquisitions; and
limit our flexibility in planning for, or reacting to, changes in our business and the industry in which we operate, thereby placing us at a competitive disadvantage compared to our competitors that have less debt.
Our sales and operations are subject to the risks of doing business internationally.
We are increasing our presence in international markets, particularly emerging markets, subjecting us to many risks that could adversely affect our business and revenues, such as:
the inability to obtain necessary foreign regulatory or pricing approvals of products in a timely manner;
collectability of accounts receivable;
fluctuations in foreign currency exchange rates, in particular a strengtheningthe recent strength of the U.S. dollar versus foreign currencies;currencies that has adversely impacted our revenues and net income;

28


difficulties in staffing and managing international operations;
the imposition of governmental controls;
less favorable intellectual property or other applicable laws;
increasingly complex standards for complying with foreign laws and regulations that may differ substantially from country to country and may conflict with corresponding U.S. laws and regulations;
the far-reaching anti-bribery and anti-corruption legislation in the U.K., including the U.K. Bribery Act 2010, and elsewhere and escalation of investigations and prosecutions pursuant to such laws;
compliance with complex import and export control laws;
restrictions on direct investments by foreign entities and trade restrictions;
greater political or economic instability; and
changes in tax laws and tariffs.
In addition, our international operations are subject to regulation under U.S. law. For example, the Foreign Corrupt Practices Act prohibits U.S. companies and their representatives from offering, promising, authorizing or making payments to foreign officials for the purpose of obtaining or retaining business abroad. In many countries, the health care professionals we regularly interact with may meet the definition of a foreign government official for purposes of the Foreign Corrupt Practices Act. Failure to comply with domestic or foreign laws could result in various adverse consequences, including: possible delay in approval or refusal to approve a product; recalls, seizures or withdrawal of an approved product from the market; disruption in the supply or availability of our products or suspension of export or import privileges; the imposition of civil or criminal sanctions; the prosecution of executives overseeing our international operations; and damage to our reputation. Any significant impairment of our ability to sell products outside of the U.S. could adversely impact our business and financial results.
Our effective tax rate may fluctuate and we may incur obligations in tax jurisdictions in excess of accrued amounts.
As a global biopharmaceutical company, we are subject to taxation in numerous countries, states and other jurisdictions. As a result, our effective tax rate is derived from a combination of applicable tax rates in the various places that we operate. In preparing our financial statements, we estimate the amount of tax that will become payable in each of such places. Our effective tax rate, however, may be different than experienced in the past due to numerous factors, including changes in the mix of our profitability from country to country, the results of examinations and audits of our tax filings, adjustments to the value of our uncertain tax positions, changes in accounting for income taxes and changes in tax laws. Any of these factors could cause us to experience an effective tax rate significantly different from previous periods or our current expectations.
In addition, our inability to secure or sustain acceptable arrangements with tax authorities and previously enacted or future changes in the tax laws, among other things, may result in tax obligations in excess of amounts accrued in our financial statements.
In the U.S., there are several proposals under consideration to reform tax law, including proposals that may reduce or eliminate the deferral of U.S. income tax on our unrepatriated earnings, penalize certain transfer pricing structures, and reduce or eliminate certain foreign or domestic tax credits or deductions. Our future reported financial results may be adversely affected by tax law changes which restrict or eliminate certain foreign tax credits or our ability to deduct expenses attributable to foreign earnings, or otherwise affect the treatment of our unrepatriated earnings.
In addition to U.S. tax reform proposals, the adoption of some or all of the recommendations set forth in the Organization for Economic Co-operation and Development’s project on “Base Erosion and Profit Shifting” (BEPS) by tax authorities in the countries in which we operate, could negatively impact our effective tax rate. These recommendations focus on payments from affiliates in high tax jurisdictions to affiliates in lower tax jurisdictions and the activities that give rise to a taxable presence in a particular country.

29


Our operating results are subject to significant fluctuations.
Our quarterly revenues, expenses and net income (loss) have fluctuated in the past and are likely to fluctuate significantly in the future due to the risks described in these “Risk Factors” as well as the timing of charges and expenses that we may take. We have recorded, or may be required to record, charges that include:
the cost of restructurings;
impairments with respect to investments, fixed assets and long-lived assets, including in-process R&D and other intangible assets;
inventory write-downs for failed quality specifications, charges for excess or obsolete inventory and charges for inventory write downs relating to product suspensions, expirations or recalls;
changes in the fair value of contingent consideration;
bad debt expenses and increased bad debt reserves;
outcomes of litigation and other legal or administrative proceedings, regulatory matters and tax matters;
milestone payments under license and collaboration agreements; and
payments in connection with acquisitions and other business development activities.
Our revenues are also subject to foreign exchange rate fluctuations due to the global nature of our operations. We recognize foreign currency gains or losses arising from our operations in the period in which we incur those gains or losses. Although we have foreign currency forward contracts to hedge specific forecasted transactions denominated in foreign currencies, our efforts to reducemitigate the impact of fluctuating currency exchange lossesrates may not be successful. As a result, currency fluctuations among our reporting currency, the U.S. dollar, and the currencies in which we do business will affect our operating results, often in unpredictable ways. Our net income may also fluctuate due to the impact of charges we may be required to take with respect to foreign currency hedge transactions. In particular, we may incur higher than expected charges from hedge ineffectiveness or from the termination of a hedge relationship.
Our operating results during any one period do not necessarily suggest the anticipated results of future periods.
We are pursuing opportunities to expand our manufacturing capacity for future clinical and commercial requirements for product candidates, which will result in the incurrence of significant investment with no assurance that such investment will be recouped.
While we believe we currently have sufficient large scale manufacturing capacity to meet our near-term manufacturing requirements, it is probable that we would need additional large scale manufacturing capacity to support future clinical and commercial manufacturing requirements for product candidates in our pipeline, if such candidates are successful and approved. We are building a large scale biologics manufacturing facility in Solothurn, Switzerland and acquired an additional manufacturing facility in Research Triangle Park, North Carolina. Due to the long lead times necessary for the expansion of manufacturing capacity, we expect to incur significant investment to build or expand our facilities or obtain third-party contract manufacturers with no assurance that such investment will be recouped. If we are unable to adequately and timely manufacture and supply our products and product candidates or if we do not fully utilize our manufacturing facilities, our business may be harmed.
Our investment in Samsung Bioepis, and our success in commercializing biosimilars developed by Samsung Bioepis, are subject to risks and uncertainties inherent in the development, manufacture and commercialization of biosimilars.
Our investment in Samsung Bioepis, and our success in commercializing biosimilars developed by Samsung Bioepis, are subject to a number of risks, including:
Reliance on Third Parties. We are dependent on the efforts of Samsung Bioepis and other third parties over whom we have limited or no control in the development and manufacturing of biosimilars products. If Samsung Bioepis or such other third parties fail to perform successfully, we may not realize the anticipated benefits of our investment in Samsung Bioepis;
Regulatory Compliance. Biosimilar products may face regulatory hurdles or delays due to the evolving and uncertain regulatory and commercial pathway of biosimilars products in certain jurisdictions;

Intellectual Property and Regulatory Challenges. Biosimilar products may face extensive patent clearances, patent infringement litigation, injunctions or regulatory challenges, which could prevent the commercial launch of a product or delay it for many years;
Failure to Gain Market and Patient Acceptance. Market success of biosimilar products will be adversely affected if patients, physicians and payers do not accept biosimilar products as safe and efficacious products offering a more competitive price or other benefit over existing therapies;
Ability to Provide Adequate Supply. Manufacturing biosimilars is complex. If we encounter any manufacturing or supply chain difficulties, we may be unable to meet higher than anticipated demand; and
Competitive Challenges. Biosimilar products face significant competition, including from innovator products and from biosimilar products offered by other companies. In some jurisdictions, local tendering processes may restrict biosimilar products from being marketed and sold in those jurisdictions. The number of competitors in a jurisdiction, the timing of approval and the ability to market biosimilar products successfully in a timely and cost-effective matter are additional factors that may impact our success and/or the success of Samsung Bioepis in this business area.
Our investments in properties may not be fully realized.
We own or lease real estate primarily consisting of buildings that contain research laboratories, office space and manufacturing operations. For strategic or other operational reasons, we may decide to further consolidate or co-locate certain aspects of our business operations or dispose of one or more of our properties, some of which may be located in markets that are experiencing high vacancy rates and decreasing property values. If we determine that the fair value of any of our owned properties is lower than their book value we may not realize the full investment in these properties and incur significant impairment charges.charges or additional depreciation when the expected useful lives of certain assets have been shortened due to the anticipated closing of facilities. If we decide to fully or partially vacate a leased property, such as we did followingceasing manufacturing at our 2013 relocation of our corporate headquarters from Weston, Massachusetts tofacility in Cambridge, Massachusetts, we may incur significant cost, including facility closing costs, employee separation and retention expenses, lease termination fees, rent expense in excess of sublease income and impairment of leasehold improvements. In addition, in the event we expand our manufacturing capacityimprovements and we do not fully utilize our manufacturing facilities, this may result in idle time at facilities or substantial excess manufacturing capacity.accelerated depreciation of assets. Any of these events may have an adverse impact on our results of operations.
Our portfolio of marketable securities is subject to market, interest and credit risk that may reduce its value.
We maintain a portfolio of marketable securities for investment of our cash. Changes in the value of our portfolio of marketable securities could adversely affect our earnings. In particular, the value of our investments may decline due to increases in interest rates, downgrades of the bonds and other securities included in our portfolio, instability in the global financial markets that reduces the liquidity of securities included in our portfolio, declines in the value of collateral underlying the securities included in our portfolio and other factors. Each of these events may cause us to record charges to reduce the carrying value of our investment portfolio or sell investments for less than our acquisition cost. Although we attempt to mitigate these risks through diversification of our investments and continuous monitoring of our portfolio's overall risk profile, the value of our investments may nevertheless decline.
There can be no assurance that we will continue to repurchase stock or that we will repurchase stock at favorable prices.
From time to time our Board of Directors authorizes stock repurchase programs, including most recently a $5.0 billion stock repurchase program in July 2016. The amount and timing of stock repurchases are subject to capital availability and our determination that stock repurchases are in the best interest of our stockholders and are in compliance with all respective laws and our agreements applicable to the repurchase of stock. Our ability to repurchase stock will depend upon, among other factors, our cash balances and potential future capital requirements for strategic transactions, results of operations, financial condition and other factors beyond our control that we may deem relevant. A reduction in, or the completion or expiration of, our stock repurchase programs could have a negative effect on our stock price. We can provide no assurance that we will repurchase stock at favorable prices, if at all.

We may not be able to access the capital and credit markets on terms that are favorable to us.
We may seek access to the capital markets to supplement our existing funds and cash generated from operations for working capital, capital expenditure and debt service requirements and other business initiatives. The capital and credit markets have experienced extreme volatility and disruption which leads to uncertainty and liquidity issues for both borrowers and investors. In the event of adverse capital and credit market conditions, we may be unable to obtain capital market financing

30


on favorable terms. Changes in credit ratings issued by nationally recognized credit rating agencies could also adversely affect our cost of financing and have an adverse effect on the market price of our securities.
Our business involves environmental risks, which include the cost of compliance and the risk of contamination or injury.
Our business and the business of several of our strategic partners involve the controlled use of hazardous materials, chemicals, biologics and radioactive compounds. Although we believe that our safety procedures for handling and disposing of such materials comply with state, federal and federalforeign standards, there will always be the risk of accidental contamination or injury. If we were to become liable for an accident, or if we were to suffer an extended facility shutdown, we could incur significant costs, damages and penalties that could harm our business. Manufacturing of our products and product candidates also requires permits from government agencies for water supply and wastewater discharge. If we do not obtain appropriate permits, orincluding permits for sufficient quantities of water and wastewater, we could incur significant costs and limits on our manufacturing volumes that could harm our business.
The illegal distribution and sale by third parties of counterfeit versions of our products or stolen products could have a negative impact on our reputation and business.
Third parties might illegally distribute and sell counterfeit or unfit versions of our products, which do not meet our rigorous manufacturing, distribution and testing standards. A patient who receives a counterfeit or unfit drug may be at risk for a number of dangerous health consequences. Our reputation and business could suffer harm as a result of counterfeit or unfit drugs sold under our brand name. Stolen inventory that is not properly stored or sold through unauthorized channels could adversely impact patient safety, our reputation and our business. In addition, thefts of inventory atthat is stolen from warehouses, plants or while in-transit, which are not properlyand that is subsequently improperly stored and which are sold through unauthorized channels, could adversely impact patient safety, our reputation and our business.
The increasing use of social media platforms presents new risks and challenges.
Social media is increasingly being used to communicate about our products and the diseases our therapies are designed to treat. Social media practices in the biopharmaceutical industry continue to evolve and regulations relating to such use are not always clear. This evolution creates uncertainty and risk of noncompliance with regulations applicable to our business. For example, patients may use social media channels to comment on the effectiveness of a product or to report an alleged adverse event. When such disclosures occur, there is a risk that we fail to monitor and comply with applicable adverse event reporting obligations or we may not be able to defend the company or the public's legitimate interests in the face of the political and market pressures generated by social media due to restrictions on what we may say about our products. There is also a risk of inappropriate disclosure of sensitive information or negative or inaccurate posts or comments about us on any social networking website. If any of these events were to occur or we otherwise fail to comply with applicable regulations, we could incur liability, face overly restrictive regulatory actions or incur other harm to our business.
Some of our collaboration agreements contain change in control provisions that may discourage a third party from attempting to acquire us.
Some of our collaboration agreements include change in control provisions that could reduce the potential acquisition price an acquirer is willing to pay or discourage a takeover attempt that could be viewed as beneficial to shareholders. Upon a change in control, some of these provisions could trigger reduced milestone, profit or royalty payments to us or give our collaboration partner rights to terminate our collaboration agreement, acquire operational control or force the purchase or sale of the programs that are the subject of the collaboration. 
Item  1B.Unresolved Staff Comments
Item  1B.     Unresolved Staff Comments
None.
Item  2.Properties

Item  2.     Properties
Below is a summary of our owned and leased properties as of December 31, 2014.2016.
Massachusetts
In Cambridge, Massachusetts, we own approximately 508,000 square feet of real estate space, consisting of a building that houses a research laboratory and a cogeneration plant totaling approximately 263,000 square feet and a building that contains research, development and quality laboratories which total approximately 245,000 square feet.
In addition, we lease a total of approximately 1,225,0001,250,000 square feet in Massachusetts, which is summarized as follows:
822,000893,000 square feet in Cambridge, Massachusetts, which is comprised of a 67,000 square foot biologics manufacturing facility, which is subleased by Brammer, and 755,000826,000 square feet for our corporate headquarters, laboratory and additional office space; and

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357,000 square feet of office space in Weston, Massachusetts, of which 175,000 square feet has been subleased through the remaining term of our lease agreement; and
46,000 square feet of warehouse space in Somerville, Massachusetts.agreement.
Our Massachusetts lease agreements expire at various dates through the year 2028.
North Carolina
In RTP, North Carolina, we own approximately 740,000834,000 square feet of real estate space, which is summarized as follows:
357,000 square feet of laboratory and office space;
175,000 square feet related to a large-scale biologics manufacturing facility;
105,000 square feet related to a biologics manufacturing facility;
60,00084,000 square feet of warehouse space;space and utilities; 
70,000 square feet related to a parenteral fill-finish facility; and
43,000 square feet related to a large-scale purification facility.
In addition, we lease 48,000188,000 square feet of a facility in RTP, North Carolina from Eisai to manufacture our and Eisai's oral solid dose products.products and 40,000 square feet of warehouse space in Durham, North Carolina.
Denmark
We haveown a large-scale biologics manufacturing facility totaling approximately 228,000 square feet located in Hillerød, Denmark.
We also own approximately 306,000 square feet of additional space, which is currently in use at this location and is summarized as follows:
139,000 square feet of warehouse, utilities and support space;
70,000 square feet related to a label and packaging facility;
47,000 square feet of administrative space; and
50,000 square feet related to a laboratory facility.facility; and
47,000 square feet of administrative space.
Switzerland
In December 2015 we acquired land in Solothurn, Switzerland where we are building a biologics manufacturing facility in the Commune of Luterbach over the next several years.
Other International
We lease office space in Zug, Switzerland, our international headquarters, the United Kingdom,U.K., Germany, France, Denmark and numerous other countries. Our international lease agreements expire at various dates through the year 2023.2028.
Item  3.Legal Proceedings

Item  3.     Legal Proceedings
For a discussion of legal matters as of December 31, 2014,2016, please read Note 21,20, Litigation to our consolidated financial statements included in this report, which is incorporated into this item by reference.
Item  4.Mine Safety Disclosures
Item  4.     Mine Safety Disclosures
Not applicable.

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PART II
Item 5.Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities
Item 5.     Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities
Market and Stockholder Information
Our common stock trades on The NASDAQ Global Select Market under the symbol “BIIB.” The following table shows the high and low sales price for our common stock as reported by The NASDAQ Global Select Market for each quarter in the years ended December 31, 20142016 and 2013:2015:
Common Stock PriceCommon Stock Price
2014 20132016 2015
High Low High LowHigh Low High Low
First Quarter$358.89
 $270.62
 $192.92
 $139.72
$301.02
 $242.07
 $480.18
 $334.40
Second Quarter$322.25
 $272.02
 $242.64
 $191.80
$292.69
 $223.02
 $432.88
 $368.88
Third Quarter$349.00
 $298.31
 $248.95
 $203.55
$333.65
 $240.07
 $412.24
 $265.00
Fourth Quarter$361.93
 $290.85
 $298.82
 $221.07
$329.83
 $268.00
 $311.65
 $254.00
As of January 30, 2015,27, 2017, there were approximately 816700 stockholders of record of our common stock.
In addition, as of January 30, 2015, 30 stockholders of record of Biogen, Inc. common stock have yet to exchange their shares of Biogen, Inc. common stock for our common stock as contemplated by the merger of Biogen, Inc. and IDEC Pharmaceuticals Corporation in November 2003.
Dividends
We have not paid cash dividends since our inception. While we historically have not paid cash dividends and do not have a current intention to pay cash dividends, we continually review our capital allocation strategies, including, among other things, payment of cash dividends, stock repurchases or acquisitions.
Issuer Purchases of Equity Securities
In July 2016 our Board of Directors authorized a program to repurchase up to $5.0 billion of our common stock (2016 Share Repurchase Program). This authorization does not have an expiration date. Repurchased shares will be retired.
The following table summarizes our common stock repurchase activity under our 2016 Share Repurchase Program during the fourth quarter of 2014:2016:
Period
Total
Number of
Shares
Purchased
(#)
 
Average Price
Paid per
Share
($)
 
Total Number of
Shares Purchased
as Part of Publicly
Announced  Programs
(#)
 
Maximum Number
of Shares That May
Yet Be Purchased
Under Our Programs
October 20147,862
 297.72
 7,771
 2,939,869
November 20141,395,731
 314.38
 1,395,731
 1,544,138
December 2014279,982
 305.98
 279,982
 1,264,156
Total1,683,575
 312.90
    
Period
Total Number of
Shares Purchased
(#)
 
Average Price
Paid per Share
($)
 
Total Number of
Shares Purchased
as Part of Publicly
Announced  Programs
(#)
 
Maximum
Approximate Dollar Value
of Shares That May Yet Be
Purchased Under
Our Programs ($ in millions)
October 20161,254,818
 298.71
 1,254,818
 $4,276.3
November 2016939,046
 294.24
 939,046
 $4,000.0
December 2016
 
 
 $4,000.0
Total2,193,864
 296.80
    
OnAs of December 31, 2016, we repurchased and retired approximately 3.3 million shares of common stock at a cost of $1.0 billion under the 2016 Share Repurchase Program.
In February 11, 2011 we announced that our Board of Directors authorized thea program to repurchase of up to 20.0 million shares of our common stock. This authorizationstock (2011 Share Repurchase Program), which has been used principally to offset common stock issuances under our share-based compensation plans. The 2011 Share Repurchase Program does not have an expiration date. AsWe did not repurchase any shares of common stock under our 2011 Share Repurchase Program during the year ended December 31, 2014,2016, and have approximately 18.71.3 million shares of our common stock at a cost of $2,770.0 million have been repurchasedremaining available for repurchase under this authorization and approximately 1.3 million shares of our common stock remain available for repurchase.authorization.


33


Stock Performance Graph
The graph below compares the five-year cumulative total stockholder return on our common stock, the S&P 500 Index, the Nasdaq Pharmaceutical Index and the Nasdaq Biotechnology Index assuming the investment of $100.00 on December 31, 20092011 with dividends being reinvested. The stock price performance in the graph below is not necessarily indicative of future price performance.
200920102011201220132014201120122013201420152016
Biogen Idec Inc.100.00
125.33
205.70
273.59
522.56
634.49
Biogen Inc.100.00
133.00
254.04
308.45
278.37
257.68
NASDAQ Pharmaceutical100.00
108.40
116.03
154.38
254.51
332.21
100.00
114.32
155.11
188.95
199.22
197.05
S&P 500 Index100.00
115.06
117.49
136.30
180.44
205.14
100.00
116.00
153.57
174.60
177.01
198.18
NASDAQ Biotechnology100.00
116.06
130.08
172.67
286.67
385.29
100.00
132.74
220.37
296.19
331.05
260.37

34Item 6.     Selected Financial Data


Item 6.Selected Financial Data
BIOGEN IDEC INC. AND SUBSIDIARIES
SELECTED FINANCIAL DATA
Our results of operations are summarized as follows:Our results of operations are summarized as follows:
For the Years Ended December 31,For the Years Ended December 31,
2014 2013 2012 2011 20102016 2015 2014 2013 2012
(In millions, except per share amounts)  (2) (4)   (2) (3) (1)(d) (e) (d) (f) (g) (h)
Results of Operations                  
Product revenues$8,203.4
 $5,542.3
 $4,166.1
 $3,836.1
 $3,470.1
Revenues from unconsolidated joint business1,195.4
 1,126.0
 1,137.9
 996.6
 1,077.2
Product revenues, net (a)
$9,817.9
 $9,188.5
 $8,203.4
 $5,542.3
 $4,166.1
Revenues from anti-CD20 therapeutic programs1,314.5
 1,339.2
 1,195.4
 1,126.0
 1,137.9
Other revenues304.5
 263.9
 212.5
 215.9
 169.1
316.4
 236.1
 304.5
 263.9
 212.5
Total revenues9,703.3
 6,932.2
 5,516.5
 5,048.6
 4,716.4
11,448.8
 10,763.8
 9,703.3
 6,932.2
 5,516.5
Total cost and expenses5,747.7
 4,441.6
 3,707.4
 3,323.9
 3,467.5
6,298.4
 5,872.8
 5,747.7
 4,441.6
 3,707.4
Gain on sale of rights16.8
 24.9
 46.8
 
 

 
 16.8
 24.9
 46.8
Income from operations3,972.4
 2,515.5
 1,855.9
 1,724.7
 1,248.9
5,150.4
 4,891.0
 3,972.4
 2,515.5
 1,855.9
Other income (expense), net(25.8) (34.9) (0.7) (13.5) (19.0)(217.4) (123.7) (25.8) (34.9) (0.7)
Income before income tax expense and equity in loss of investee, net of tax3,946.6
 2,480.6
 1,855.1
 1,711.2
 1,229.9
4,933.0
 4,767.3
 3,946.6
 2,480.6
 1,855.1
Income tax expense989.9
 601.0
 470.6
 444.5
 331.3
1,237.3
 1,161.6
 989.9
 601.0
 470.6
Equity in loss of investee, net of tax15.1
 17.2
 4.5
 
 

 12.5
 15.1
 17.2
 4.5
Net income2,941.5
 1,862.3
 1,380.0
 1,266.7
 898.6
3,695.7
 3,593.2
 2,941.6
 1,862.3
 1,380.0
Net income (loss) attributable to noncontrolling interests, net of tax6.8
 
 
 32.3
 (106.7)(7.1) 46.2
 6.8
 
 
Net income attributable to Biogen Idec Inc.$2,934.8
 $1,862.3
 $1,380.0
 $1,234.4
 $1,005.2
Net income attributable to Biogen Inc.$3,702.8
 $3,547.0
 $2,934.8
 $1,862.3
 $1,380.0
         
Diluted Earnings Per Share                  
Diluted earnings per share attributable to Biogen Idec Inc.$12.37
 $7.81
 $5.76
 $5.04
 $3.94
Weighted-average shares used in calculating diluted earnings per share attributable to Biogen Idec Inc.237.2
 238.3
 239.7
 245.0
 254.9
Diluted earnings per share attributable to Biogen Inc.$16.93
 $15.34
 $12.37
 $7.81
 $5.76
Weighted-average shares used in calculating diluted earnings per share attributable to Biogen Inc.218.8
 231.2
 237.2
 238.3
 239.7
         
Our financial condition is summarized as follows:Our financial condition is summarized as follows:
As of December 31,
2016 2015 2014 2013 2012
(In millions)         
Financial Condition                  
Cash, cash equivalents and marketable securities$3,316.0
 $1,848.5
 $3,742.4
 $3,107.4
 $1,950.8
$7,724.5
 $6,188.9
 $3,316.0
 $1,848.5
 $3,742.4
Total assets$14,316.6
 $11,863.3
 $10,130.1
 $9,049.6
 $8,092.5
$22,876.8
 $19,504.8
 $14,314.7
 $11,863.3
 $10,130.1
Notes payable, line of credit and other financing arrangements, less current portion$582.1
 $592.4
 $687.4
 $1,060.8
 $1,066.4
Total Biogen Idec Inc. shareholders’ equity$10,809.0
 $8,620.2
 $6,961.5
 $6,425.5
 $5,396.5
Notes payable and other financing arrangements, less current portion (b)
$6,512.7
 $6,521.5
 $580.3
 $592.4
 $687.4
Total Biogen Inc. shareholders’ equity (c)
$12,140.1
 $9,372.8
 $10,809.0
 $8,620.2
 $6,961.5
In addition to the following notes, the financial data included within the tables above should be read in conjunction with our consolidated financial statements and related notes and the “Management’s Discussion and Analysis of Financial Condition and Results of Operations” sections of this report and our previously filed Form 10-Ks.
(1)(a)Included in total cost and expenses are charges to acquired in-process research and development (IPR&D) totaling $245.0 million. Of this amount, $205.0 million was incurred in connection withProduct revenues, net reflect the license agreement entered into with Knopp Neurosciences Inc. (Knopp), which we consolidated as we determined that we were the primary beneficiaryimpact of the entity. The $205.0 million charge was partially offset byfollowing product launches:
Commercial sales of SPINRAZA began in the fourth quarter of 2016.

Under the terms of our collaboration agreement with AbbVie, we began to recognize revenues on sales of ZINBRYTA to third parties in the E.U. in the third quarter of 2016.
Under the terms of our commercial agreement with Samsung Bioepis, we began to recognize revenues on sales of BENEPALI and FLIXABI to third parties in the E.U. in the first quarter of 2016 and third quarter of 2016, respectively.
Commercial sales of ALPROLIX commenced in the second quarter of 2014 and commercial sales of ELOCTATE and PLEGRIDY commenced in the third quarter of 2014.
TECFIDERA began in April 2013.
(b)Notes payable and other financing arrangements reflects the issuance of our senior unsecured notes for an attributionaggregate principal amount of $145.0 million to$6.0 billion in September 2015, and the noncontrolling interest. We also incurred a charge2013 repayment of $40.0 millionour 6.0% notes that were issued in connection with our acquisition2008 for an aggregate principal amount of Biogen Idec Hemophilia Inc. (BIH), formerly Syntonix, related to the initiation of patient enrollment in a registrational trial of ALPROLIX.$450.0 million.
(2)(c)Total Biogen Inc.'s shareholders' equity reflects the repurchase of approximately 32.8 million shares of our common stock at a cost of approximately $8.3 billion between 2012 and 2016:
During 2016 we repurchased and retired approximately 3.3 million shares of our common stock at a cost of $1.0 billion under our 2016 Share Repurchase Program.
During 2015 we repurchased and retired approximately 16.8 million shares of our common stock at a cost of $5.0 billion under our 2015 Share Repurchase Program.
During 2014, 2013 and 2012 we repurchased approximately 2.9 million, 2.0 million and 7.8 million shares, respectively of our common stock at a cost of approximately $2.3 billion under our 2011 Share Repurchase Program of which approximately 3.7 million of these shares were retired.
(d)Total cost and expenses for the years ended December 31, 2016 and 2015, include restructuring charges of $33.1 million and $93.4 million, respectively. In addition, total cost and expenses for the year ended December 31, 2016, also include charges to cost of sales totaling $52.4 million of expenses incurred as a result of our determination to vacate and cease manufacturing in our small-scale biologics facility in Cambridge, MA as well as vacate our warehouse in Somerville, MA. Total cost and expenses for year ended December 31, 2016, also include $18.1 million of costs incurred directly related to our separation of our hemophilia business into an independent, publicly traded company.
(e)Total cost and expenses for the year ended December 31, 2016, includes a pre-tax charge of $454.8 million related to the January 2017 settlement and license agreement with Forward Pharma A/S (Forward Pharma).
(f)In June 2014 AIFA approved a resolution affirming that there is no reimbursement limit from and after February 2013. As a result, we recognized $53.5 million of TYSABRI revenues in the second quarter of 2014 related to the periods beginning February 2013 that were previously deferred.
(g)Our share of revenues from unconsolidated joint businessanti-CD20 therapeutic programs reflects charges of $50.0 million in 2011 and $49.7 million in 2013 for damages and interest awarded to Hoechst in Genentech's arbitration with Hoechst for RITUXAN.
(3)Biogen Idec Inc.’s shareholders’ equity reflects a reduction in additional paid in capital and noncontrolling interests totaling $187.3 million resulting from our purchase of the noncontrolling interest in our joint venture investments in Biogen Dompé SRL and Biogen Dompé Switzerland GmbH.

35


(4)(h)Commencing in the second quarter of 2013 product and total revenues include 100% of net revenues related to sales of TYSABRI as a result of our acquisition of all remaining rights to TYSABRI from Elan and net revenues related to salesPharma International, Ltd (Elan), an affiliate of TECFIDERA. In addition, uponElan Corporation, plc. Upon the closing, of our acquisition of all remaining rights to TYSABRI, our collaboration agreement was terminated, and we no longer record collaboration profit sharing.sharing expense. We recognized collaboration profit sharing expense of $85.4 million and $317.9 million during the years ended December 31, 2013 and 2012, respectively.

36


Item 7.Management’s Discussion and Analysis of Financial Condition and Results of Operations
The following discussion should be read in conjunction with our consolidated financial statements and related notes beginning on page F-1 of this report. Certain totals may not sum due to rounding.
Executive Summary
Introduction
Biogen Idec is a global biopharmaceutical company focused on discovering, developing, manufacturing and delivering therapies forto people living with serious neurological, rare and autoimmune and hematologic disorders. diseases.
Our principal marketed products include TECFIDERA, AVONEX, PLEGRIDY, TECFIDERA, TYSABRI, ZINBRYTA and FAMPYRA for multiple sclerosis (MS), ALPROLIXFUMADERM for hemophilia Bthe treatment of severe plaque psoriasis and ELOCTATESPINRAZA for hemophilia A.the treatment of spinal muscular atrophy (SMA). We also collaborate on the developmenthave certain business and commercialization offinancial rights with respect to RITUXAN for the treatment of non-Hodgkin's lymphoma, chronic lymphocytic leukemia (CLL) and other conditions, and share profits and losses for GAZYVA which is approvedindicated for the treatment of chronic lymphocytic leukemia.CLL and follicular lymphoma, and other potential anti-CD20 therapies under a collaboration agreement with Genentech, Inc. (Genentech), a wholly-owned member of the Roche Group.
In May 2016 we announced our intention to spin off our hemophilia business, Bioverativ Inc. (Bioverativ), as an independent, publicly traded company. Bioverativ will focus on the discovery, development and commercialization of therapies for the treatment of hemophilia and other blood disorders, including ELOCTATE for the treatment of hemophilia A and ALPROLIX for the treatment of hemophilia B. Bioverativ will also assume all of our rights and obligations under our collaboration agreement with Swedish Orphan Biovitrum AB (Sobi) and our collaboration and license agreement with Sangamo Biosciences Inc. (Sangamo).
On February 1, 2017, we completed the distribution of all the then outstanding shares of common stock of Bioverativ to Biogen stockholders, who received one share of Bioverativ common stock for every two shares of Biogen common stock. As a result of the distribution, Bioverativ is now an independent public company whose shares of common stock are trading under the symbol "BIVV"
on the Nasdaq Global Select Market.
The financial results of Bioverativ are included in our consolidated results of operations and financial position in our audited consolidated financial statements for the periods presented in this Form 10-K. The financial results of Bioverativ will be excluded from our consolidated results of operations and financial position commencing February 1, 2017. For additional information regarding the separation of Bioverativ, please read Note 26, Subsequent Events to our consolidated financial statements included in this report.
Our current revenues depend upon continued sales of our principal products. Weproducts and, unless we develop, acquire rights to, and commercialize new products and technologies, we may be substantially dependent on sales from our principal products for many years, including an increasing relianceyears. Further, following the completion of the spin-off of our hemophilia business, our revenues will be further reliant and concentrated on sales of TECFIDERA as we expand into additional markets. our MS products in an increasingly competitive market.
In the longer term, our revenue growth will be dependent upon the successful clinical development, regulatory approval and launch of new commercial products as well as additional indications for our existing products, our ability to obtain and maintain patents and other rights related to our marketed products, and assets originating from our research and development efforts and successful execution of external business development opportunities. As part
We support our drug discovery and development efforts through the commitment of our ongoingsignificant resources to discovery, research and development efforts,programs and business development opportunities, particularly within areas of our scientific, manufacturing and technical capabilities. For nearly two decades we have devoted significant resourcesled in the research and development of new therapies to conducting clinical studies to advancetreat MS, resulting in our leading portfolio of MS treatments. Now our research is focused on additional improvements in the treatment of MS, such as, the development of next generation therapies for MS with a goal to reverse or possibly repair damage caused by the disease. We are also applying our scientific expertise to solve some of the most challenging and complex diseases, including Alzheimer's disease, Parkinson's disease and amyotrophic lateral sclerosis (ALS), and are employing innovative technologies to discover potential treatments for rare and genetic disorders, including new pharmaceutical productsways of treating diseases through gene therapy.
Our innovative drug development and commercialization activities are complemented by our biosimilar therapies that expand access to exploremedicines and reduce the utility ofcost burden for healthcare systems. We are leveraging our existing productsmanufacturing capabilities and know-how by developing, manufacturing and marketing


biosimilars through Samsung Bioepis, our joint venture with Samsung BioLogics Co. Ltd. (Samsung Biologics). Under our commercial agreement with Samsung Bioepis, we market and sell BENEPALI, an etanercept biosimilar referencing ENBREL, and FLIXABI, an infliximab biosimilar referencing REMICADE, in treating disorders beyond those currently approved in their labels.the European Union (E.U.).
Financial Highlights
The following table is a summary
Diluted earnings per share attributable to Biogen Inc. were $16.93 for 2016, representing an increase of financial results achieved:10.4% over the same period in 2015.
 
For the Years Ended
December 31,
 % Change
 2014 compared to 2013
(In millions, except per share amounts and percentages)2014 
2013
(1)
 
Total revenues$9,703.3
 $6,932.2
 40.0%
Income from operations$3,972.4
 $2,515.5
 57.9%
Net income attributable to Biogen Idec Inc.$2,934.8
 $1,862.3
 57.6%
Diluted earnings per share attributable to Biogen Idec Inc.$12.37
 $7.81
 58.3%
(1)Commencing in the second quarter of 2013, product and total revenues include 100% of net revenues related to TYSABRI as a result of our acquisition of all remaining rights to TYSABRI from Elan and net revenues related to sales of TECFIDERA.
As described below under “Results of Operations,” our income from operations for the year ended December 31, 2014, reflect2016, reflects the following:
Worldwide AVONEXTotal revenues totaledwere $3,013.111,448.8 million for 20142016, representing an increase of 0.3%6.4% over the same period in 20132015.
Worldwide PLEGRIDYProduct revenues, totaled $44.5 million for 2014.
Worldwide TECFIDERA revenues totaled $2,909.2 million for 2014, representing an increase of 232.1% over 2013.
Worldwide TYSABRI revenuesnet totaled $1,959.59,817.9 million for 20142016, representing an increase of 28.4%6.8% over the same period in 20132015. This increase was driven by a 9.1% increase in worldwide TECFIDERA revenues, a 52.8% increase in worldwide hemophilia revenues, a 4.1% increase in worldwide TYSABRI revenues and revenues from BENEPALI. These increases are partially offset by a 5.8% decrease in worldwide Interferon revenues. Product revenues, net for
2016, compared to the same period in 2015, were also negatively impacted by a $167.8 million decrease in hedge gains recognized under our foreign currency hedging program in comparative periods.
Revenues from anti-CD20 therapeutic programs totaled $1,314.5 million for 2016, representing a decrease of 1.8% over the same period in 2015.
Worldwide FAMPYRAOther revenues totaled $80.2 million for 2014, representing an increase of 8.4% over 2013.
Worldwide ALPROLIX revenues totaled $76.0 million for 2014.
Worldwide ELOCTATE revenues totaled $58.4 million for 2014.
Our share of revenues from unconsolidated joint business totaled $1,195.4316.4 million for 20142016, representing an increase of 6.2%34.0% from the same period in 20132015. This increase was primarily driven by an increase in other corporate revenues, which includes amounts earned with respect to our contract manufacturing activities.

37


Total cost and expenses increasedtotaled 29.4%$6,298.4 million for 20142016, representing an increase of 7.2%, compared to the same period in 20132015. This increase resulted from a 42.8% increase in the amortization of acquired intangible assets,was driven by a 36.5%$454.8 million litigation settlement and license charge and a 19.2% increase in cost of sales, which includes a charge of $45.5 million for accelerated depreciation as a result of the determination to cease manufacturing in Cambridge, MA and vacate our biologics manufacturing facility in Cambridge, MA and warehouse space in Somerville, MA. These increases were partially offset by a 31.1%7.8% increase in research and development expense and a 30.4% increasedecrease in selling, general and administrative expense, partially offset byexpenses and a 100.0% decrease in collaboration profit sharing and an increase in the gain on fair value remeasurement of contingent consideration compared with the same period in 2013.restructuring charges.
The change in amortization of acquired intangible assets was primarily driven by a $60.2 million increase in amortization of acquired and in-licensed rights and patents as we recognized a full year of expense related to our TYSABRI rights in 2014 versus nine months of expense in 2013, total impairment charges of $50.9 million related to one of our out-licensed patents and one of our in-process research and development intangible assets, and higher amortization of our developed technology intangible asset as a result of lower expected lifetime revenues of AVONEX versus the prior year.
The increase in cost of sales was primarily driven by higher unit sales volume, including recent product launches and higher royalty payments due to Elan. The increase in research and development expense was primarily related to an increase in costs incurred in connection with our early stage programs and milestone and upfront payments. Higher selling, general and administrative expense resulted from increased costs incurred in connection with our recent product launches.
We generated $2,942.1$4,522.4 million of net cash flows from operations for 2014,2016, which were primarily driven by earnings offset by an increase in working capital.earnings. Cash, cash equivalents and marketable securities totaled approximately $3,316.0$7,724.5 million as of December 31, 20142016.
During the year ended December 31, 2016, we repurchased and retired approximately 3.3 million shares of common stock at a cost of $1.0 billion under our share repurchase programs.
Collaborative and Other Relationships
In May 2016 we entered into a collaboration and alliance with the University of Pennsylvania (UPenn) to advance gene therapy and gene editing technologies. For additional information related to this transaction, please read Note 19, .Collaborative and Other Relationships to our consolidated financial statements included in this report.


Restructuring and Cost Saving Initiatives
During the third quarter of 2016 we initiated cost saving measures primarily intended to realign our organizational structure due to the changes in roles and workforce resulting from our decision to spin off our hemophilia business, and to achieve further targeted cost reductions.
Additionally, in connection with the transaction to sublease our rights to the manufacturing facility in Cambridge, MA to Brammer Bio MA, LLC (Brammer), certain employees were separated from Biogen.
For additional information related to our restructuring and cost saving initiatives, please read Note 3, Restructuring, Business Transformation and Other Cost Saving Initiatives to our consolidated financial statements included in this report.
Business Environment
We conduct our business within theThe biopharmaceutical industry and the markets in which is highlywe operate are intensely competitive. Many of our competitors are working to develop or have commercialized products similar to those we market or are developing. In addition, the commercialization of certain of our own approved MS products, products of our collaborators and pipeline product candidates may negatively impact future sales of our existing MS products. Our products may also face increased competitive pressures from the introduction of generic versions, related prodrug derivativesprodrugs of existing therapeutics or biosimilars of existing products and other technologies, such as gene therapies.therapies and bispecific antibodies.
The Patient Protection and Affordable Care Act (PPACA)
The PPACA included a significant expansionIn addition, sales of the Medicaid program, as well as the creation of new state-based health benefit exchanges, or marketplaces, through which individuals and small businesses may purchase health insurance. Premium and cost-sharing credits and subsidiesour products are available to those who qualify based on income. Marketplace plans began to enroll new membersdependent, in October 2013, and coverage began on January 1, 2014. Although the effects of the legislation are still unclear, PPACA will result in a greater number of individuals with health insurance under Medicaid and the marketplace health plans. The impact on manufacturers, including us, will depend inlarge part, on the formularyavailability and benefit design decisions made by insurance sponsors or plans participatingextent of coverage, pricing and reimbursement from government health administration authorities, private health insurers and other organizations. Drug prices are under significant scrutiny in the programs. It is possible that individuals who were previously unablemarkets in which our products are prescribed. Drug pricing and other health care costs continue to access insurance may now become insured, thus increasing coverage forbe subject to intense political and societal pressures.
For additional information related to our products. This potential increase in coverage, however, may be offset by the added discountscompetition and pricing risks that could be required in these channels as well asnegatively impact our product sales, please read the number“Risk Factors” section of patients who over time move from commercial insurance to the health insurance marketplaces. It is also possible that we may need to provide discounts or rebates to such plans in order to maintain favorable formulary access for our products for this patient population, which could have an adverse impact on our sales and results of operations.report.
During the third quarter of 2014, the Internal Revenue Service issued final regulations related to the Branded Pharmaceutical Drug (BPD) Fee, which had the effect of changing the recognition of the fee for accounting purposes, from the period in which the fee was paid, to the period when the sale occurs. Our products that are subject to the BPD fee include PLEGRIDY, TECFIDERA and TYSABRI, which are recorded in selling, general and administrative expenses, and RITUXAN, which is recorded in unconsolidated joint business. As a result of these final regulations, we recognized an incremental BPD fee of $43.6 million during 2014 for the periods of 2013 and 2014. The final regulations did not change the timing of payments.

38


Results of Operations
Revenues
Revenues are summarized as follows:
For the Years Ended
December 31,
 % Change
For the Years Ended
December 31,
 % Change
2014 compared to 2013 2013 compared to 20122016 compared to 2015 2015 compared to 2014
(In millions, except percentages)2014 2013 2012 2016 2015 2014 
Product Revenues:                  
United States$5,566.7
 $3,581.0
 $2,176.8
 55.5% 64.5 %$7,050.4
 $6,545.8
 $5,566.7
 7.7 % 17.6 %
Rest of world2,636.7
 1,961.3
 1,989.3
 34.4% (1.4)%2,767.5
 2,642.7
 2,636.7
 4.7 % 0.2 %
Total product revenues8,203.4
 5,542.3
 4,166.1
 48.0% 33.0 %9,817.9
 9,188.5
 8,203.4
 6.8 % 12.0 %
Unconsolidated joint business revenues1,195.4
 1,126.0
 1,137.9
 6.2% (1.0)%
Revenues from anti-CD20 therapeutic programs1,314.5
 1,339.2
 1,195.4
 (1.8)% 12.0 %
Other revenues304.5
 263.9
 212.5
 15.4% 24.2 %316.4
 236.1
 304.5
 34.0 % (22.5)%
Total revenues$9,703.3
 $6,932.2
 $5,516.5
 40.0% 25.7 %$11,448.8
 $10,763.8
 $9,703.3
 6.4 % 10.9 %

Product Revenues
Product revenues are summarized as follows:
For the Years Ended
December 31,
 % Change
For the Years Ended
December 31,
 % Change
2014 compared to 2013 2013 compared to 20122016 compared to 2015 2015 compared to 2014
(In millions, except percentages)2014 2013 2012 2016 2015 2014 
Multiple Sclerosis (MS):         
AVONEX$3,013.1
 $3,005.5
 $2,913.1
 0.3% 3.2%
PLEGRIDY44.5
 
 
 **
 **
Multiple Sclerosis:         
TECFIDERA2,909.2
 876.1
 
 232.1% **
$3,968.1
 $3,638.4
 $2,909.2
 9.1 % 25.1 %
Interferon*2,795.2
 2,968.7
 3,057.6
 (5.8)% (2.9)%
TYSABRI1,959.5
 1,526.5
 1,135.9
 28.4% 34.4%1,963.8
 1,886.1
 1,959.5
 4.1 % (3.7)%
FAMPYRA80.2
 74.0
 57.4
 8.4% 28.9%84.9
 89.7
 80.2
 (5.4)% 11.8 %
ZINBRYTA7.8
 
 
 **
 **
Hemophilia:                  
ELOCTATE513.2
 319.7
 58.4
 60.5 % 447.4 %
ALPROLIX76.0
 
 
 **
 **
333.7
 234.5
 76.0
 42.3 % 208.6 %
ELOCTATE58.4
 
 
 **
 **
Other product revenues:                  
FUMADERM62.5
 60.2
 59.7
 3.8% 0.8%45.9
 51.4
 62.5
 (10.7)% (17.8)%
SPINRAZA4.6
 
 
 **
 **
BENEPALI100.6
 
 
 **
 **
FLIXABI0.1
 
 
 **
 **
Total product revenues$8,203.4
 $5,542.3
 $4,166.1
 48.0% 33.0%$9,817.9
 $9,188.5
 $8,203.4
 6.8 % 12.0 %
* Interferon includes AVONEX and PLEGRIDY.
** Percentage not meaningful.

Multiple Sclerosis (MS)
AVONEX and PLEGRIDY
Revenues from AVONEX and PLEGRIDY are summarized as follows:
 
For the Years Ended
December 31,
 % Change
 2014 compared to 2013 2013 compared to 2012
(In millions, except percentages)2014 2013 2012 
AVONEX:         
United States$1,956.7
 $1,902.4
 $1,793.7
 2.9 % 6.1 %
Rest of world1,056.4
 1,103.1
 1,119.4
 (4.2)% (1.5)%
Total AVONEX revenues$3,013.1
 $3,005.5
 $2,913.1
 0.3 % 3.2 %
PLEGRIDY (1):         
United States$27.8
 $
 $
 **
 **
Rest of world16.7
 
 
 **
 **
Total PLEGRIDY revenues$44.5
 $
 $
 **
 **
(1)E.U. sales began in the third quarter of 2014 and in the U.S. in the fourth quarter of 2014.

39


For 2014 compared to 2013, the increase in U.S. AVONEX revenues was primarily due to price increases, partially offset by a decrease in unit sales volume of 10%, which was attributable in part to patients transitioning to PLEGRIDY and oral MS therapies, including TECFIDERA. For 2013 compared to 2012, the increase in U.S. AVONEX revenues was primarily due to price increases, partially offset by a decrease in unit sales volume of 8%, which were attributable in part to patients transitioning to oral therapies including TECFIDERA.
For 2014 compared to 2013, the decrease in rest of world AVONEX revenues was due to a 7% decrease in unit demand in Europe primarily attributable to patients transitioning to oral therapies including TECFIDERA, partially offset by a 6% increase in unit demand in the Emerging Markets region. Rest of world AVONEX revenue for 2014 compared to 2013 also reflects the negative impact of foreign currency exchange rate changes experienced in 2014, partially offset by gains recognized in relation to the settlement of certain cash flow hedge instruments under our foreign currency hedging program. For 2013 compared to 2012, the decrease in rest of world AVONEX revenues was primarily due to pricing reductions resulting from austerity measures enacted in some countries, partially offset by increased unit demand primarily in Europe. Rest of world AVONEX revenues for 2013 compared to 2012 also reflects the positive impact of foreign currency exchange rates, partially offset by losses recognized in relation to the settlement of certain cash flow hedge instruments under our foreign currency hedging program.
TECFIDERAALPROLIX
Revenues from TECFIDERA are summarized as follows:AVONEX
ELOCTATE
PLEGRIDY
TYSABRI
ZINBRYTA
Other*
Hillerød, Denmark
TYSABRI
Biosimilars
* Other includes products manufactured for contract manufacturing partners
In addition to our drug substance manufacturing facilities, we have a drug product manufacturing facility and supporting infrastructure in RTP, North Carolina. This parenteral facility adds capabilities and capacity for filling biologics into vials.
We also lease from Eisai an oral solid dose products manufacturing facility in RTP, North Carolina, where we manufacture TECFIDERA and other oral solid dose products, including products for Eisai. This facility supplements our outsourced small molecule manufacturing capabilities. Under our lease arrangement, Eisai may provide us with packaging services for oral solid dose products. In August 2015 we agreed to purchase this facility following the expiration of our current three-year lease in the third quarter of 2018 and Eisai's completion of certain activities.
For a period of time following the spin-off of Bioverativ, we agreed to manufacture and supply, exclusively for Bioverativ, drug substance, drug product and finished goods with respect to ELOCTATE and ALPROLIX and pipeline product candidates.
Genentech is responsible for all worldwide manufacturing activities for bulk RITUXAN and GAZYVA and has sourced the manufacture of certain bulk RITUXAN and GAZYVA requirements to a third party, Acorda Therapeutics supplies FAMPYRA to us pursuant to its supply agreement with Alkermes, Inc. and Ionis supplies the active pharmaceutical ingredient (API) for SPINRAZA.
Third-Party Suppliers and Manufacturers
We principally use third parties to manufacture the API, except as noted above for SPINRAZA, and, to a lesser extent, the final product for our small molecule products and product candidates, including TECFIDERA and FUMADERM and the final drug product for our large molecule products and product candidates, including SPINRAZA.
We source all of our fill-finish and the majority of final product assembly and storage operations for our products, along with a substantial part of our packaging operations, to a concentrated group of third-party contract manufacturing organizations. We have internal label and packaging capability for clinical and commercial products at our Hillerød facility. Raw materials, delivery devices, such as syringes and auto-injectors, and other supplies required for the production of our products and product candidates are procured from various third-party suppliers and manufacturers in quantities adequate to meet our needs. Continuity of supply of such raw materials, devices and supplies is assured using a strategy of dual sourcing where possible or by a risk-based inventory strategy. Our third-party service providers, suppliers and manufacturers may be subject to routine cGMP inspections by the FDA or comparable agencies in other jurisdictions and undergo assessment and certification by our quality management group.


Our Employees
As of December 31, 2016, we had approximately 7,400 employees worldwide.
Our Executive Officers (as of February 2, 2017)
Officer Current Position Age Year Joined Biogen
Michel Vounatsos Chief Executive Officer 55 2016
Susan H. Alexander Executive Vice President, Chief Legal Officer and Corporate Secretary 60 2006
Paul J. Clancy Executive Vice President, Finance and Chief Financial Officer 55 2001
Gregory F. Covino Vice President, Finance and Chief Accounting Officer 51 2012
Michael D. Ehlers Executive Vice President, Research and Development 48 2016
Paul McKenzie Executive Vice President, Pharmaceutical Operations and Technology 51 2016
Kenneth DiPietro Executive Vice President, Human Resources 58 2012
Adriana (Andi) Karaboutis Executive Vice President, Technology, Business Solutions and Corporate Affairs 54 2014
Alfred W. Sandrock, Jr., M.D., Ph.D. Chief Medical Officer and Executive Vice President of Neurology Discovery and Development 59 1998
 
For the Years Ended
December 31,
 % Change
 2014 compared to 2013 2013 compared to 2012
(In millions, except percentages)2014 2013 2012 
United States (1)$2,426.6
 $864.4
 $
 180.7% **
Rest of world (2)482.6
 11.7
 
 **
 **
Total TECFIDERA revenues$2,909.2
 $876.1
 $
 232.1% **
(1)U.S. sales began in the second quarter of 2013.
Michel Vounatsos
Experience
Mr. Vounatsos has served as our Chief Executive Officer since January 2017. Prior to that, from April 2016 to December 2016, Mr. Vounatsos served as our Executive Vice President and Chief Commercial Officer. Prior to joining Biogen, Mr. Vounatsos spent 20 years at Merck where he most recently served as President, Primary Care, Customer Business Line. In this role, he led Merck’s global primary care business unit, a role which encompassed Merck’s cardiology-metabolic, general medicine, women’s health and biosimilars groups and developed and instituted a strategic framework for enhancing the company’s relationships with key constituents, including the most significant providers, payers and retailers and the world’s largest governments. Mr. Vounatsos previously held leadership positions across Europe and in China for Merck. Prior to that, Mr. Vounatsos held management positions at Ciba-Geigy.
Education
lUniversite Victor Segalen, Bordeaux II, France, C.S.C.T. Certificate in Medicine
lHEC School of Management - Paris, M.B.A.
(2)Germany sales began in the first quarter of 2014.
For 2014 compared to 2013, the increase in U.S. TECFIDERA revenues was primarily due to increases in unit sales volume.
For 2014 compared to 2013, rest of world TECFIDERA revenues increased as sales in Germany began in the first quarter of 2014. We expect that rest of world TECFIDERA revenue will increase as TECFIDERA becomes commercially available in additional markets in 2015.
TYSABRI
Revenues from TYSABRI are summarized as follows:
 
For the Years Ended
December 31,
 % Change
 2014 compared to 2013 2013 compared to 2012
(In millions, except percentages)2014 2013 2012 
United States$1,025.1
 $814.2
 $383.1
 25.9% 112.5 %
Rest of world934.4
 712.3
 752.8
 31.2% (5.4)%
Total TYSABRI revenues$1,959.5
 $1,526.5
 $1,135.9
 28.4% 34.4 %
Susan H. Alexander
Experience
Ms. Alexander has served as our Executive Vice President, Chief Legal Officer and Corporate Secretary since December 2011. Prior to that, from 2006 to December 2011, Ms. Alexander served as our Executive Vice President, General Counsel and Corporate Secretary. From 2003 to January 2006, Ms. Alexander served as the Senior Vice President, General Counsel and Corporate Secretary of PAREXEL International Corporation, a biopharmaceutical services company. From 2001 to 2003, Ms. Alexander served as General Counsel of IONA Technologies, a software company. From 1995 to 2001, Ms. Alexander served as Counsel at Cabot Corporation, a specialty chemicals and performance materials company. Prior to that, Ms. Alexander was a partner at the law firms of Hinckley, Allen & Snyder and Fine & Ambrogne.
Public Company Boards
lBoard of Directors of Invacare Corporation, a medical and healthcare product company
Education
lWellesley College, B.A
lBoston University School of Law, J.D.

For 2014 compared
Paul J. Clancy
Experience
Mr. Clancy has served as our Executive Vice President, Finance and Chief Financial Officer since August 2007. Mr. Clancy joined Biogen, Inc. in 2001 and has held several senior executive positions with us, including Vice President of Business Planning, Portfolio Management and U.S. Marketing, and Senior Vice President of Finance with responsibilities for leading the Treasury, Tax, Investor Relations and Business Planning groups. Prior to 2013that, he spent 13 years at PepsiCo, a food and beverage company, serving in a range of financial and general management positions.
Public Company Boards
lBoard of Directors of Agios Pharmaceuticals, Inc., a biopharmaceutical company
lBoard of Directors of Incyte Corporation, a biopharmaceutical company
Education
lBabson College, B.S. in Finance
lColumbia University, M.B.A.
Gregory F. Covino
Experience
Mr. Covino has served as our Vice President, Finance and Chief Accounting Officer since April 2012. Prior to that, Mr. Covino served at Boston Scientific Corporation, a medical device company, as Vice President, Corporate Analysis and Control since March 2010, having responsibility for the increasecompany's internal audit function, and as Vice President, Finance, International from February 2008 to March 2010, having responsibility for the financial activities of the company's international division. Prior to that, Mr. Covino held several finance positions at Hubbell Incorporated, an electrical products company, including Vice President, Chief Accounting Officer and Controller from 2002 to January 2008, Interim Chief Financial Officer from 2004 to 2005, and Director, Corporate Accounting from 1999 to 2002.
Education
lBryant University, B.S. in Business Administration
Michael D. Ehlers
Experience
Dr. Ehlers has served as our Executive Vice President, Head of R&D since May 2016. Prior to joining Biogen, Dr. Ehlers served in leadership positions at Pfizer, Inc., including Senior Vice President & Head BioTherapeutics R&D and Chief Scientific Officer, Neuroscience & Pain. Prior to that, Dr. Ehlers was the George Barth Geller Professor of Neurobiology and an Investigator of the Howard Hughes Medical Institute at Duke University Medical Center. He is the recipient of numerous awards including the Eppendorf & Science Prize in Neurobiology, the John J. Abel Award in Pharmacology, the Society for Neuroscience Young Investigator Award, a National Institute of Mental Health MERIT Award, the National Alliance for Schizophrenia and Depression Distinguished Investigator Award, and the Massachusetts Medical Society Honored Business Leader Award. In 2013, Dr. Ehlers became the 11th recipient of the Thudichum Medal of the Biochemical Society of the United Kingdom. Past recipients include two Nobel laureates. Dr. Ehlers has authored over 100 scientific papers, has served on the Editorial Boards of Annual Reviews in Medicine, Annual Reviews in Pharmacology and Toxicology, the Journal of Neuroscience, the Journal of Biological Chemistry, the Journal of Molecular and Cellular Neuroscience, and has sat on advisory committees of the National Institutes of Health.
Outside Affiliations
lPhRMA Foundation Basic Pharmacology Advisory Committee
lJanelia Research Institute Advisory Committee
lMcKnight Endowment Fund for Neuroscience Board
lWorld Economic Forum Global Agenda Council on Brain Research
Education
lCalifornia Institute of Technology, B.S. Chemistry
lThe John Hopkins University School of Medicine, M.D.
lThe John Hopkins University School of Medicine, Ph.D. Neuroscience

Paul McKenzie
Experience
Dr. McKenzie has served as our Executive Vice President, Pharmaceutical Operations and Technology since July 2016. Prior to that, from February 2016 to June 2016, he served as our Senior Vice President for Global Biologics Manufacturing & Technical Operations. Prior to joining Biogen, since 2008, Dr. McKenzie held a number of positions of increasing responsibility at Johnson & Johnson (J&J), including Vice President of R&D for J&J’s Ethicon business where he led the manufacturing and technical operations team responsible for internal and external manufacturing of Janssen’s pharmaceutical portfolio. He also ran global Development for Janssen R&D, helping to manage pipeline activities from discovery through clinical development and commercialization. Prior to J&J, Dr. McKenzie also held various R&D and manufacturing positions at Bristol-Myers Squibb and Merck & Co.
Education
lUniversity of Pennsylvania, B.S. Chemical Engineering
lCarnegie Mellon University, Ph.D. Chemical Engineering
Kenneth DiPietro
Experience
Mr. DiPietro has served as our Executive Vice President, Human Resources since January 2012. Mr. DiPietro joined Biogen from Lenovo Group, a technology company, where he served as Senior Vice President, Human Resources from 2005 to June 2011. From 2003 to 2005, he served as Corporate Vice President, Human Resources at Microsoft Corporation, a technology company. From 1999 to 2002, Mr. DiPietro worked as Vice President, Human Resources at Dell Inc., a technology company. Prior to that, he spent 17 years at PepsiCo, a food and beverage company, serving in a range of human resource and general management positions.
Public Company Boards
lBoard of Directors of InVivo Therapeutics Corporation, a medical device company
Education
lCornell University, B.S. in Industrial and Labor Relations
Adriana (Andi) Karaboutis
Experience
Ms. Karaboutis has served as our Executive Vice President, Technology, Business Solutions and Corporate Affairs since December 2015 and prior to that served as our Executive Vice President, Technology and Business Solutions since joining Biogen in September 2014. Prior to that, Ms. Karaboutis was Vice President and Global Chief Information Officer of Dell, Inc., where she was responsible for leading a global IT organization focused on powering Dell as an end-to-end technology solutions provider. Prior to joining Dell in 2010, Ms. Karaboutis spent over 20 years at General Motors and Ford Motor Company in various international leadership positions including computer-integrated manufacturing, supply chain operations, and information technology.
Public Company Boards
lBoard of Directors of Advance Auto Parts, an automotive aftermarket parts provider
Education
lWayne State University, B.S. in Computer Science
Alfred W. Sandrock, Jr., M.D., Ph.D.
Experience
Dr. Sandrock has served as our Chief Medical Officer and Executive Vice President of Neurology Discovery and Development since November 2015. Prior to that, Dr. Sandrock served as our Chief Medical Officer and Group Senior Vice President from May 2013 to October 2015, and as our Chief Medical Officer and Senior Vice President of Development Sciences from February 2012 to April 2013. Prior to that, Dr. Sandrock held several senior executive positions since joining us in 1998, including Senior Vice President of Neurology Research and Development and Vice President of Clinical Development, Neurology.
Public Company Boards
lBoard of Directors of Neurocrine Biosciences, Inc., a life sciences company
Education
lStanford University, B.A. in Human Biology
lHarvard Medical School, M.D.
lHarvard University, Ph.D. in Neurobiology
lMassachusetts General Hospital, internship in Medicine, residency and chief residency in Neurology, and clinical fellowship in Neuromuscular Disease and Clinical Neurophysiology (electromyography)

Available Information
Our principal executive offices are located at 225 Binney Street, Cambridge, MA 02142 and our telephone number is (617) 679-2000. Our website address is www.biogen.com. We make available free of charge through the Investors section of our website our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and all amendments to those reports as soon as reasonably practicable after such material is electronically filed with or furnished to the Securities and Exchange Commission (SEC). We include our website address in this report only as an inactive textual reference and do not intend it to be an active link to our website. The contents of our website are not incorporated into this report.


Item  1A.     Risk Factors
We are substantially dependent on revenues from our principal products.
Our current revenues depend upon continued sales of our principal products, and, unless we develop or acquire rights to new products and technologies, we may be substantially dependent on sales from our principal products for many years. Further, following the completion of the spin-off of our hemophilia business, our revenues will be further reliant and concentrated on sales of our MS products in an increasingly competitive market, and revenue from sales of our product for spinal muscular atrophy. Any of the following negative developments relating to any of our principal products may adversely affect our revenues and results of operations or could cause a decline in our stock price:
safety or efficacy issues;
the introduction or greater acceptance of competing products;
constraints and additional pressures on product pricing or price increases, including those resulting from governmental or regulatory requirements, increased competition, or changes in, or implementation of, reimbursement policies and practices of payors and other third parties; or
adverse legal, administrative, regulatory or legislative developments.
SPINRAZA was recently approved by the FDA, and is in the early stages of commercial launch. In addition to risks associated with new product launches and the other factors described in these “Risk Factors”, our ability to successfully commercialize SPINRAZA may be adversely affected due to:
our limited marketing experience within the spinal muscular atrophy market, which may impact our ability to develop relationships with the associated medical and scientific community;
the lack of readiness of healthcare providers to treat patients with spinal muscular atrophy;
the effectiveness of our commercial strategy for marketing SPINRAZA; and
our ability to maintain a positive reputation among patients, healthcare providers and others in the spinal muscular atrophy community, which may be impacted by pricing and reimbursement decisions relating to SPINRAZA.
If we fail to compete effectively, our business and market position would suffer.
The biopharmaceutical industry and the markets in which we operate are intensely competitive. We compete in the marketing and sale of our products, the development of new products and processes, the acquisition of rights to new products with commercial potential and the hiring and retention of personnel. We compete with biotechnology and pharmaceutical companies that have a greater number of products on the market and in the product pipeline, greater financial and other resources and other technological or competitive advantages. One or more of our competitors may benefit from significantly greater sales and marketing capabilities, may develop products that are accepted more widely than ours or may receive patent protection that dominates, blocks or adversely affects our product development or business.
Our products are also susceptible to competition from generics and biosimilars in many markets. Generic versions of drugs and biosimilars are likely to be sold at substantially lower prices than branded products. Accordingly, the introduction of generic or biosimilar versions of our marketed products likely would significantly reduce both the price that we receive for such marketed products and the volume of products that we sell, which may have an adverse impact on our results of operations.
In the MS market, we face intense competition as the number of products and competitors continues to expand. Due to our significant reliance on sales of our MS products, our business may be harmed if we are unable to successfully compete in the MS market. More specifically, our ability to compete, maintain and grow our share in the MS market may be adversely affected due to a number of factors, including:
the introduction of more efficacious, safer, less expensive or more convenient alternatives to our MS products, including our own products and products of our collaborators;
the introduction of lower-cost biosimilars, follow-on products or generic versions of branded MS products sold by our competitors, and the possibility of future competition from generic versions or prodrugs of existing therapeutics or from off-label use by physicians of therapies indicated for other conditions to treat MS patients;

patient dynamics, including the size of the patient population and our ability to attract new patients to our therapies;
damage to physician and patient confidence in any of our MS products or to our sales and reputation as a result of label changes or adverse experiences or events that may occur with patients treated with our MS products;
inability to obtain appropriate pricing and reimbursement for our MS products compared to our competitors in key international markets; or
our ability to obtain and maintain patent, data or market exclusivity for our MS products.
Sales of our products depend, to a significant extent, on adequate coverage, pricing and reimbursement from third-party payors, which are subject to increasing and intense pressure from political, social, competitive and other sources. Our inability to maintain adequate coverage, or a reduction in pricing or reimbursement, could have an adverse effect on our business, revenues and results of operations and could cause a decline in our stock price.
Sales of our products are dependent, in large part, on the availability and extent of coverage, pricing and reimbursement from government health administration authorities, private health insurers and other organizations. When a new pharmaceutical product is approved, the availability of government and private reimbursement for that product may be uncertain, as is the pricing and amount for which that product will be reimbursed.
Pricing and reimbursement for our products may be adversely affected by a number of factors, including:
changes in, and implementation of, federal, state or foreign government regulations or private third-party payors' reimbursement policies;
pressure by employers on private health insurance plans to reduce costs; and
consolidation and increasing assertiveness of payors, including managed care organizations, health insurers, pharmacy benefit managers, government health administration authorities, private health insurers and other organizations, seeking price discounts or rebates in connection with the placement of our products on their formularies and, in some cases, the imposition of restrictions on access or coverage of particular drugs or pricing determined based on perceived value.
Our ability to set the price for our products can vary significantly from country to country and as a result so can the price of our products. Certain countries set prices by reference to the prices in other countries where our products are marketed. Thus, our inability to secure adequate prices in a particular country may not only limit the revenue from our products within that country, but may also adversely affect our ability to obtain acceptable prices in other markets. This may create the opportunity for third-party cross-border trade or influence our decision to sell or not to sell a product, thus adversely affecting our geographic expansion plans and revenues.
Our failure to maintain adequate coverage, pricing, or reimbursement for our products would have an adverse effect on our business, revenues and results of operations, could curtail or eliminate our ability to adequately fund research and development programs for the discovery and commercialization of new products and could cause a decline in our stock price.
Drug prices are under significant scrutiny in the markets in which our products are prescribed. We expect drug pricing and other health care costs to continue to be subject to intense political and societal pressures on a global basis. As a result, our business and reputation may be harmed, our stock price may be adversely impacted and experience periods of volatility, and our results of operations may be adversely impacted. 

Our results of operations may be adversely affected by current and potential future healthcare reforms.
In the U.S., federal and state legislatures, health agencies and third-party payors continue to focus on containing the cost of health care. Legislative and regulatory proposals and enactments to reform health care insurance programs could significantly influence the manner in which our products are prescribed and purchased. For example, provisions of the PPACA have resulted in changes in the way health care is paid for by both governmental and private insurers, including increased rebates owed by manufacturers under the Medicaid Drug Rebate Program, annual fees and taxes on manufacturers of certain branded prescription drugs, the requirement that manufacturers participate in a discount program for certain outpatient drugs under Medicare Part D and the expansion of the number of hospitals eligible for discounts under Section 340B of the Public Health Service Act. These changes have had and are expected to continue to have a significant impact on our business. In 2017, we may face uncertainties as a result of likely federal and administrative efforts to repeal, substantially modify or invalidate some or all of the provisions of the PPACA. There is no assurance that the PPACA, as currently enacted or as amended in the future, will not adversely affect our business and financial results, and we cannot predict how future federal or state legislative or administrative changes relating to healthcare reform will affect our business.
There is also significant economic pressure on state budgets that may result in states increasingly seeking to achieve budget savings through mechanisms that limit coverage or payment for our drugs. In recent years, some states have considered legislation and ballot initiatives that would control the prices of drugs, including laws to allow importation of pharmaceutical products from lower cost jurisdictions outside the U.S. and laws intended to impose price controls on state drug purchases. State Medicaid programs are increasingly requesting manufacturers to pay supplemental rebates and requiring prior authorization by the state program for use of any drug for which supplemental rebates are not being paid. Government efforts to reduce Medicaid expenses may lead to increased use of managed care organizations by Medicaid programs. This may result in managed care organizations influencing prescription decisions for a larger segment of the population and a corresponding constraint on prices and reimbursement for our products.
In the E.U. and some other international markets, the government provides health care at low cost to consumers and regulates pharmaceutical prices, patient eligibility or reimbursement levels to control costs for the government-sponsored health care system. Many countries have announced or implemented measures to reduce health care costs to constrain their overall level of government expenditures. These measures vary by country and may include, among other things, patient access restrictions, suspensions on price increases, prospective and possibly retroactive price reductions and other recoupments and increased mandatory discounts or rebates, recoveries of past price increases and greater importation of drugs from lower-cost countries to higher-cost countries. These measures have negatively impacted our revenues, and may continue to adversely affect our revenues and results of operations in the future.
Adverse safety events or restrictions on use and safety warnings for our products can negatively affect our business, product sales and stock price.
Adverse safety events involving our marketed products may have a negative impact on our business. Discovery of safety issues with our products could create product liability and could cause additional regulatory scrutiny and requirements for additional labeling or safety monitoring, withdrawal of products from the market and the imposition of fines or criminal penalties. Adverse safety events may also damage physician and patient confidence in our products and our reputation. Any of these could result in liabilities, loss of revenue, material write-offs of inventory, material impairments of intangible assets, goodwill and fixed assets, material restructuring charges and other adverse impacts on our results of operations.
Regulatory authorities are making greater amounts of stand-alone safety information directly available to the public through periodic safety update reports, patient registries and other reporting requirements. The reporting of adverse safety events involving our products or products similar to ours and public rumors about such events may increase claims against us and may also cause our product sales or stock price to decline or experience periods of volatility.
Restrictions on use or significant safety warnings that may be required to be included in the label of our products, such as the risk of developing progressive multifocal leukoencephalopathy (PML), a serious brain infection, in the label for certain of our products, may significantly reduce expected revenues for those products and require significant expense and management time.

If we are unable to obtain and maintain adequate protection for our data, intellectual property and other proprietary rights, our business may be harmed.
Our success depends in part on our ability to obtain and defend patent and other intellectual property rights that are important to the commercialization of our products and product candidates. The degree of patent protection that will be afforded to our products and processes in the U.S. and in other important markets remains uncertain and is dependent upon the scope of protection decided upon by the patent offices, courts, administrative bodies and lawmakers in these countries. We can provide no assurance that we will successfully obtain or preserve patent protection for the technologies incorporated into our products and processes, or that the protection obtained will be of sufficient breadth and degree to protect our commercial interests in all countries where we conduct business. If we cannot prevent others from exploiting our inventions, we will not derive the benefit from them that we currently expect. Furthermore, we can provide no assurance that our products will not infringe patents or other intellectual property rights held by third parties.
We also rely on regulatory exclusivity for protection of our products. Implementation and enforcement of regulatory exclusivity, which may consist of regulatory data protection and market protection, varies widely from country to country. Failure to qualify for regulatory exclusivity, or failure to obtain or maintain the extent or duration of such protections that we expect in each of the markets for our products due to challenges, changes or interpretations in the law or otherwise, could affect our revenue for our products or our decision on whether to market our products in a particular country or countries or could otherwise have an adverse impact on our results of operations.
Litigation, interferences, oppositions, inter partes reviews or other proceedings are, have been and may in the future be necessary in some instances to determine the validity and scope of certain of our proprietary rights, and in other instances to determine the validity, scope or non-infringement of certain patent rights claimed by third parties to be pertinent to the manufacture, use or sale of our products. We may also face challenges to our patent and regulatory protections covering our products by third parties, including manufacturers of generics and biosimilars that may choose to launch or attempt to launch their products before the expiration of our patent or regulatory exclusivity. Litigation, interference, oppositions, inter partes reviews, administrative challenges or other similar types of proceedings are unpredictable and may be protracted, expensive and distracting to management. The outcome of such proceedings could adversely affect the validity and scope of our patent or other proprietary rights, hinder our ability to manufacture and market our products, require us to seek a license for the infringed product or technology or result in the assessment of significant monetary damages against us that may exceed amounts, if any, accrued in our financial statements. An adverse determination in a judicial or administrative proceeding or a failure to obtain necessary licenses could prevent us from manufacturing or selling our products. Furthermore, payments under any licenses that we are able to obtain would reduce our profits derived from the covered products and services.
Our long-term success depends upon the successful development of new products and additional indications for existing products.
Our long-term viability and growth will depend upon successful development of additional indications for our existing products as well as successful development of new products and technologies from our research and development activities, our biosimilars joint venture with Samsung Biologics or licenses or acquisitions from third parties.
Product development is very expensive and involves a high degree of risk. Only a small number of research and development programs result in the commercialization of a product. Clinical trials may indicate that our product candidates lack efficacy, have harmful side effects, result in unexpected adverse events or raise other concerns that may significantly reduce the likelihood of regulatory approval. This may result in terminated programs, significant restrictions on use and safety warnings in an approved label, adverse placement within the treatment paradigm, or significant reduction in the commercial potential of the product candidate.
Clinical trials and the development of biopharmaceutical products is a lengthy and complex process. If we fail to adequately manage our clinical activities, our clinical trials or potential regulatory approvals may be delayed or denied.
Conducting clinical trials is a complex, time-consuming and expensive process. Our ability to complete clinical trials in a timely fashion depends in large part on a number of key factors. These factors include protocol design, regulatory and institutional review board approval, patient enrollment rates and compliance with extensive current Good Clinical Practices. If we or our third-party clinical trial providers or third-party contract research organizations (CROs) do not successfully carry out these clinical activities, our clinical trials or the potential regulatory approval of a product candidate may be delayed or be unsuccessful.

We have opened clinical sites and are enrolling patients in a number of countries where our experience is more limited. In most cases, we use the services of third parties to carry out our clinical trial related activities and rely on such parties to accurately report their results. Our reliance on third parties for these activities may impact our ability to control the timing, conduct, expense and quality of our clinical trials. One CRO has responsibility for a substantial portion of our clinical trial related activities and reporting. If this CRO does not adequately perform, many of our trials may be affected. We may need to replace our CROs. Although we believe there are a number of other CROs we could engage to continue these activities, the replacement of an existing CRO may result in the delay of the affected trials or otherwise adversely affect our efforts to obtain regulatory approvals and commercialize our product candidates.
Successful preclinical work or early stage clinical trials do not ensure success in later stage trials, regulatory approval or commercial viability of a product.
Positive results in a trial may not be replicated in subsequent or confirmatory trials. Additionally, success in preclinical work or early stage clinical trials does not ensure that later stage or larger scale clinical trials will be successful or that regulatory approval will be obtained. In addition, even if later stage clinical trials are successful, regulatory authorities may delay or decline approval of our product candidates. Regulatory authorities may disagree with our view of the data, require additional studies or disagree with our trial design or endpoints. Regulatory authorities may also fail to approve the facilities or the processes used to manufacture a product candidate, our dosing or delivery methods or companion devices. Regulatory authorities may grant marketing approval that is more restricted than anticipated. These restrictions may include limiting indications to narrow patient populations and the imposition of safety monitoring, educational requirements and risk evaluation and mitigation strategies. The occurrence of any of these events could result in significant costs and expenses, have an adverse effect on our business, financial condition and results of operations and cause our stock price to decline or experience periods of volatility.
Even if we are able to successfully develop new products or indications, sales of new products or products with additional indications may not meet investor expectations. We may also make a strategic decision to discontinue development of a product or indication if, for example, we believe commercialization will be difficult relative to the standard of care or other opportunities in our pipeline.
Management and key personnel changes may disrupt our operations, and we may have difficulty retaining key personnel or attracting and retaining qualified replacements on a timely basis for management and other key personnel who may leave the Company.
We have experienced changes in management and other key personnel in critical functions across our organization, including our chief executive officer, and heads of research and development and pharmaceutical operations and technology. Changes in management and other key personnel have the potential to disrupt our business, and any such disruption could adversely affect our operations, programs, growth, financial condition and results of operations. Further, new members of management may have different perspectives on programs and opportunities for our business, which may cause us to focus on new business opportunities or reduce or change emphasis on our existing business programs.
Our success is dependent upon our ability to attract and retain qualified management and key personnel in a highly competitive environment. Qualified individuals are in high demand, and we may incur significant costs to attract them, particularly at the executive level. We may face difficulty in attracting and retaining key talent for a number of reasons, such as management changes, the underperformance or discontinuation of one or more late stage programs or recruitment by competitors. We cannot assure that we will be able to hire or retain the personnel necessary for our operations or that the loss of any such personnel will not have a material impact on our financial condition and results of operations.
Manufacturing issues could substantially increase our costs, limit supply of our products and reduce our revenues.
The process of manufacturing our products is complex, highly regulated and subject to numerous risks, including:
Risk of Product Loss. The manufacturing process for our products is extremely susceptible to product loss due to contamination, oxidation, equipment failure or improper installation or operation of equipment, or vendor or operator error. Even minor deviations from normal manufacturing processes could result in reduced production yields, product defects and other supply disruptions. If microbial, viral or other contaminations are discovered in our products or manufacturing facilities, we may need to close our manufacturing facilities for an extended period of time to investigate and remediate the contaminant.

Risks of Reliance on Third Parties and Single Source Providers. We rely on third-party suppliers and manufacturers for many aspects of our manufacturing process for our products and product candidates. In some cases, due to the unique manner in which our products are manufactured, we rely on single source providers of several raw materials and manufacturing supplies. These third parties are independent entities subject to their own unique operational and financial risks that are outside of our control. These third parties may not perform their obligations in a timely and cost-effective manner or in compliance with applicable regulations, and they may be unable or unwilling to increase production capacity commensurate with demand for our existing or future products. Finding alternative providers could take a significant amount of time and involve significant expense due to the specialized nature of the services and the need to obtain regulatory approval of any significant changes to our suppliers or manufacturing methods. We cannot be certain that we could reach agreement with alternative providers or that the FDA or other regulatory authorities would approve our use of such alternatives.
Global Bulk Supply Risks. We rely on our principal manufacturing facilities for the production of drug substance for our large molecule products and product candidates. Our global bulk supply of these products and product candidates depends on the uninterrupted and efficient operation of these facilities, which could be adversely affected by equipment failures, labor shortages, natural disasters, power failures and numerous other factors.
Risks Relating to Compliance with cGMP. We and our third-party providers are generally required to maintain compliance with cGMP and other stringent requirements and are subject to inspections by the FDA and comparable agencies in other jurisdictions to confirm such compliance. Any delay, interruption or other issues that arise in the manufacture, fill-finish, packaging or storage of our products as a result of a failure of our facilities or the facilities or operations of third parties to pass any regulatory agency inspection could significantly impair our ability to develop and commercialize our products. Significant noncompliance could also result in the imposition of monetary penalties or other civil or criminal sanctions and damage our reputation.
Any adverse developments affecting our manufacturing operations or the operations of our third-party suppliers and manufacturers may result in shipment delays, inventory shortages, lot failures, product withdrawals or recalls or other interruptions in the commercial supply of our products. We may also have to take inventory write-offs and incur other charges and expenses for products that fail to meet specifications, undertake costly remediation efforts or seek more costly manufacturing alternatives. Such developments could increase our manufacturing costs, cause us to lose revenue or market share as patients and physicians turn to competing therapeutics, diminish our profitability or damage our reputation.
We depend on relationships with collaborators and other third-parties for revenue, and the development, regulatory approval, commercialization and marketing of certain products, which are outside of our full control.
We rely on a number of significant collaborative relationships for revenue, and the development, regulatory approval, commercialization and marketing of certain of our products and product candidates. We also outsource to third parties certain aspects of our regulatory affairs and clinical development relating to our products and product candidates. Reliance on collaborative and other third-party relationships subjects us to a number of risks, including:
we may be unable to control the resources our collaborators or third parties devote to our programs or products;
disputes may arise under the agreement, including with respect to the achievement and payment of milestones or ownership of rights to technology developed with our collaborators or other third parties, and the underlying contract with our collaborators or other third parties may fail to provide significant protection or may fail to be effectively enforced if the collaborators or third parties fail to perform;
the interests of our collaborators or third parties may not always be aligned with our interests, such parties may not pursue regulatory approvals or market a product in the same manner or to the same extent that we would, which could adversely affect our revenues;
third-party relationships and collaborations often require the parties to cooperate, and failure to do so effectively could adversely affect product sales, or the clinical development or regulatory approvals of products under joint control or could result in termination of the research, development or commercialization of product candidates or result in litigation or arbitration; and

any failure on the part of our collaborators or other third parties to comply with applicable laws and regulatory requirements in the marketing, sale and maintenance of the marketing authorization of our products or to fulfill any responsibilities our collaborators or other third parties may have to protect and enforce any intellectual property rights underlying our products could have an adverse effect on our revenues as well as involve us in possible legal proceedings.
Given these risks, there is considerable uncertainty regarding the success of our current and future collaborative efforts. If these efforts fail, our product development or commercialization of new products could be delayed or revenues from products could decline.
Our business may be adversely affected if we do not successfully execute our growth initiatives.
We anticipate growth through internal development projects, commercial initiatives and external opportunities, which may include the acquisition, partnering and in-licensing of products, technologies and companies or the entry into strategic alliances and collaborations. While we believe we have a number of promising programs in our pipeline, failure of internal development projects to advance or difficulties in executing on our commercial initiatives could impact our current and future growth, resulting in additional reliance on external development opportunities for growth. The availability of high quality, cost-effective development opportunities is limited and competitive, and we are not certain that we will be able to identify candidates that we and our shareholders consider suitable or complete transactions on terms that are acceptable to us and our shareholders. We may fail to complete transactions for other reasons, including if we are unable to obtain desired financing on favorable terms, if at all. Even if we are able to successfully identify and complete acquisitions and other strategic alliances and collaborations, we may face unanticipated costs or liabilities in connection with the transaction or we may not be able to integrate them or take full advantage of them or otherwise realize the benefits that we expect.
Supporting our growth initiatives and the further development of our existing products and potential new products in our pipeline will require significant capital expenditures and management resources, including investments in research and development, sales and marketing, manufacturing capabilities and other areas of our business. If we do not successfully manage our growth initiatives, then our business and financial results may be adversely affected and we may incur asset impairment or restructuring charges.
We may incur operational difficulties or be exposed to claims and liabilities as a result of the separation and distribution of Bioverativ.
On February 1, 2017, we distributed all of the then outstanding shares of Bioverativ common stock to Biogen stockholders in connection with the separation of our hemophilia business. In connection with the distribution, we entered into a separation and distribution agreement and various other agreements (including a transition services agreement, a tax matters agreement, a manufacturing and supply agreement, an employee matters agreement, an intellectual property matters agreement and certain other commercial agreements). These agreements govern the separation and distribution and the relationship between the two companies going forward, including with respect to potential tax-related losses associated with the separation and distribution. They also provide for the performance of services by each company for the benefit of the other for a period of time (including under the manufacturing and supply agreement pursuant to which we will manufacture and supply certain products and materials to Bioverativ).
There could be significant liability if the separation and distribution is determined to be a taxable transaction. Bioverativ has agreed to indemnify us for certain potential liabilities that may arise, but we cannot guarantee that Bioverativ will be able to satisfy its indemnification obligations.
The separation and distribution agreement provides for indemnification obligations designed to make Bioverativ financially responsible for many liabilities that may exist relating to its business activities, whether incurred prior to or after the distribution, including any pending or future litigation. It is possible that a court would disregard the allocation agreed to between us and Bioverativ and require us to assume responsibility for obligations allocated to Bioverativ. Third parties could also seek to hold us responsible for any of these liabilities or obligations, and the indemnity rights we have under the separation and distribution agreement may not be sufficient to fully cover all of these liabilities and obligations. Even if we are successful in obtaining indemnification, we may have to bear costs temporarily. In addition, our indemnity obligations to Bioverativ may be significant. These risks could negatively affect our business, financial condition or results of operations.

The separation of Bioverativ continues to involve a number of risks, including, among other things, the indemnification risks described above and the potential that management’s and our employees’ attention will be significantly diverted by the provision of transitional services. Certain of the agreements described above provide for the performance of services by each company for the benefit of the other for a period of time. If Bioverativ is unable to satisfy its obligations under these agreements, including its indemnification obligations, we could incur losses. These arrangements could also lead to disputes over rights to certain shared property and over the allocation of costs and revenues for products and operations. Our inability to effectively manage the separation activities and related events could adversely affect our business, financial condition or results of operations.
We may not achieve some or all of the expected benefits of the separation and distribution, and such events may adversely affect our business.
We may not be able to achieve the full strategic and financial benefits expected to result from the separation and distribution, or such benefits may be delayed or not occur at all. If we fail to achieve some or all of the expected benefits of the separation, or if such benefits are delayed, our business, financial condition, results of operations and the value of our stock could be adversely impacted.
A breakdown or breach of our technology systems could subject us to liability or interrupt the operation of our business.
We are increasingly dependent upon technology systems and data. Our computer systems continue to increase in multitude and complexity due to the growth in our business, making them potentially vulnerable to breakdown, malicious intrusion and random attack. Likewise, data privacy or security breaches by individuals authorized to access our technology systems or others may pose a risk that sensitive data, including intellectual property, trade secrets or personal information belonging to us, our patients, customers or other business partners, may be exposed to unauthorized persons or to the public. Cyber-attacks are increasing in their frequency, sophistication and intensity, and are becoming increasingly difficult to detect. They are often carried out by motivated, well-resourced, skilled and persistent actors including nation states, organized crime groups and "hacktivists." Cyber-attacks could include the deployment of harmful malware and key loggers, a denial-of-service attack, a malicious website, the use of social engineering and other means to affect the confidentiality, integrity and availability of our technology systems and data. Our key business partners face similar risks and any security breach of their systems could adversely affect our security posture. While we continue to build and improve our systems and infrastructure and believe we have taken appropriate security measures to reduce these risks to our data and information technology systems, there can be no assurance that our efforts will prevent breakdowns or breaches in our systems that could adversely affect our business and operations and/or result in the loss of critical or sensitive information, which could result in financial, legal, business or reputational harm to us. In addition, our liability insurance may not be sufficient in type or amount to cover us against claims related to security breaches, cyber-attacks and other related breaches.
If we fail to comply with the extensive legal and regulatory requirements affecting the health care industry, we could face increased costs, penalties and a loss of business.
Our activities, and the activities of our collaborators, distributors and other third-party providers, are subject to extensive government regulation and oversight both in the U.S. and in foreign jurisdictions. The FDA and comparable agencies in other jurisdictions directly regulate many of our most critical business activities, including the conduct of preclinical and clinical studies, product manufacturing, advertising and promotion, product distribution, adverse event reporting and product risk management. Our interactions in the U.S. or abroad with physicians and other health care providers that prescribe or purchase our products are also subject to government regulation designed to prevent fraud and abuse in the sale and use of the products and place greater restrictions on the marketing practices of health care companies. Health care companies such as ours are facing heightened scrutiny of their relationships with health care providers from anti-corruption enforcement officials. In addition, health care companies such as ours have been the target of lawsuits and investigations alleging violations of government regulation, including claims asserting submission of incorrect pricing information, impermissible off-label promotion of pharmaceutical products, payments intended to influence the referral of health care business, submission of false claims for government reimbursement, antitrust violations or violations related to environmental matters. There is also enhanced scrutiny of company-sponsored patient assistance programs, including insurance premium and co-pay assistance programs and donations to third party charities that provide such assistance. If we, or our vendors or donation recipients, are deemed to fail to comply with relevant laws, regulations or government guidance in the operation of these programs, we could be subject to significant fines or penalties. Risks relating to compliance with laws and regulations may be heightened as we continue to expand our global operations and enter new therapeutic areas with different patient populations, which may have different product distribution methods, marketing programs or patient assistance programs from those we currently utilize or support.

Regulations governing the health care industry are subject to change, with possibly retroactive effect, including:
new laws, regulations or judicial decisions, or new interpretations of existing laws, regulations or decisions, related to health care availability, pricing or marketing practices, compliance with wage and hour laws and other employment practices, method of delivery, payment for health care products and services, compliance with health information and data privacy and security laws and regulations, tracking and reporting payments and other transfers of value made to physicians and teaching hospitals, extensive anti-bribery and anti-corruption prohibitions, product serialization and labeling requirements and used product take-back requirements;
changes in the FDA and foreign regulatory approval processes that may delay or prevent the approval of new products and result in lost market opportunity;
requirements that provide for increased transparency of clinical trial results and quality data, such as the EMA’s clinical transparency policy, which could impact our ability to protect trade secrets and competitively-sensitive information contained in approval applications or could be misinterpreted leading to reputational damage, misperception or legal action which could harm our business; and
changes in FDA and foreign regulations that may require additional safety monitoring, labeling changes, restrictions on product distribution or use, or other measures after the introduction of our products to market, which could increase our costs of doing business, adversely affect the future permitted uses of approved products, or otherwise adversely affect the market for our products.
Violations of governmental regulation may be punishable by criminal and civil sanctions against us, including fines and civil monetary penalties and exclusion from participation in government programs, including Medicare and Medicaid, as well as against executives overseeing our business. In addition to penalties for violation of laws and regulations, we could be required to repay amounts we received from government payors, or pay additional rebates and interest if we are found to have miscalculated the pricing information we have submitted to the government. We cannot ensure that our compliance controls, policies and procedures will in every instance protect us from acts committed by our employees, collaborators, partners or third-party providers that would violate the laws or regulations of the jurisdictions in which we operate. Whether or not we have complied with the law, an investigation into alleged unlawful conduct could increase our expenses, damage our reputation, divert management time and attention and adversely affect our business.
Our effective tax rate may fluctuate and we may incur obligations in tax jurisdictions in excess of accrued amounts.
As a global biopharmaceutical company, we are subject to taxation in numerous countries, states and other jurisdictions. As a result, our effective tax rate is derived from a combination of applicable tax rates in the various places that we operate. In preparing our financial statements, we estimate the amount of tax that will become payable in each of such places. Our effective tax rate, however, may be different than experienced in the past due to numerous factors, including changes in the mix of our profitability from country to country, the results of examinations and audits of our tax filings, adjustments to the value of our uncertain tax positions, changes in accounting for income taxes and changes in tax laws. Any of these factors could cause us to experience an effective tax rate significantly different from previous periods or our current expectations.
In addition, our inability to secure or sustain acceptable arrangements with tax authorities and future changes in the tax laws, among other things, may result in tax obligations in excess of amounts accrued in our financial statements.
In the U.S., there are several proposals under consideration to reform tax law, including proposals that may reduce or eliminate the deferral of U.S. income tax on our unrepatriated earnings, penalize certain transfer pricing structures, and reduce or eliminate certain foreign or domestic tax credits or deductions. Our future reported financial results may be adversely affected by tax law changes which restrict or eliminate certain foreign tax credits or our ability to deduct expenses attributable to foreign earnings, or otherwise affect the treatment of our unrepatriated earnings.
In addition to U.S. tax reform proposals, the adoption of some or all of the recommendations set forth in the Organization for Economic Co-operation and Development’s project on “Base Erosion and Profit Shifting” (BEPS) by tax authorities in the countries in which we operate, could negatively impact our effective tax rate. These recommendations focus on payments from affiliates in high tax jurisdictions to affiliates in lower tax jurisdictions and the activities that give rise to a taxable presence in a particular country.

Our indebtedness could adversely affect our business and limit our ability to plan for or respond to changes in our business.
Our indebtedness, together with our significant contingent liabilities, including milestone and royalty payment obligations, could have important consequences to our business; for example, such obligations could:
increase our vulnerability to general adverse economic and industry conditions;
limit our ability to access capital markets and incur additional debt in the future;
require us to dedicate a substantial portion of our cash flow from operations to payments on our indebtedness, thereby reducing the availability of our cash flow for other purposes, including business development efforts, research and development and mergers and acquisitions; and
limit our flexibility in planning for, or reacting to, changes in our business and the industry in which we operate, thereby placing us at a competitive disadvantage compared to our competitors that have less debt.
Our sales and operations are subject to the risks of doing business internationally.
We are increasing our presence in international markets, particularly emerging markets, subjecting us to many risks that could adversely affect our business and revenues, such as:
the inability to obtain necessary foreign regulatory or pricing approvals of products in a timely manner;
collectability of accounts receivable;
fluctuations in foreign currency exchange rates, in particular the recent strength of the U.S. dollar versus foreign currencies that has adversely impacted our revenues and net income;
difficulties in staffing and managing international operations;
the imposition of governmental controls;
less favorable intellectual property or other applicable laws;
increasingly complex standards for complying with foreign laws and regulations that may differ substantially from country to country and may conflict with corresponding U.S. laws and regulations;
the far-reaching anti-bribery and anti-corruption legislation in the U.K., including the U.K. Bribery Act 2010, and elsewhere and escalation of investigations and prosecutions pursuant to such laws;
compliance with complex import and export control laws;
restrictions on direct investments by foreign entities and trade restrictions;
greater political or economic instability; and
changes in tax laws and tariffs.
In addition, our international operations are subject to regulation under U.S. law. For example, the Foreign Corrupt Practices Act prohibits U.S. companies and their representatives from offering, promising, authorizing or making payments to foreign officials for the purpose of obtaining or retaining business abroad. In many countries, the health care professionals we regularly interact with may meet the definition of a foreign government official for purposes of the Foreign Corrupt Practices Act. Failure to comply with domestic or foreign laws could result in various adverse consequences, including: possible delay in approval or refusal to approve a product; recalls, seizures or withdrawal of an approved product from the market; disruption in the supply or availability of our products or suspension of export or import privileges; the imposition of civil or criminal sanctions; the prosecution of executives overseeing our international operations; and damage to our reputation. Any significant impairment of our ability to sell products outside of the U.S. could adversely impact our business and financial results.

Our operating results are subject to significant fluctuations.
Our quarterly revenues, expenses and net income (loss) have fluctuated in the past and are likely to fluctuate significantly in the future due to the risks described in these “Risk Factors” as well as the timing of charges and expenses that we may take. We have recorded, or may be required to record, charges that include:
the cost of restructurings;
impairments with respect to investments, fixed assets and long-lived assets, including in-process R&D and other intangible assets;
inventory write-downs for failed quality specifications, charges for excess or obsolete inventory and charges for inventory write downs relating to product suspensions, expirations or recalls;
changes in the fair value of contingent consideration;
bad debt expenses and increased bad debt reserves;
outcomes of litigation and other legal or administrative proceedings, regulatory matters and tax matters;
milestone payments under license and collaboration agreements; and
payments in connection with acquisitions and other business development activities.
Our revenues are also subject to foreign exchange rate fluctuations due to the global nature of our operations. Although we have foreign currency forward contracts to hedge specific forecasted transactions denominated in foreign currencies, our efforts to mitigate the impact of fluctuating currency exchange rates may not be successful. As a result, currency fluctuations among our reporting currency, the U.S. dollar, and the currencies in which we do business will affect our operating results, often in unpredictable ways. Our net income may also fluctuate due to the impact of charges we may be required to take with respect to foreign currency hedge transactions. In particular, we may incur higher than expected charges from hedge ineffectiveness or from the termination of a hedge relationship.
Our operating results during any one period do not necessarily suggest the anticipated results of future periods.
We are pursuing opportunities to expand our manufacturing capacity for future clinical and commercial requirements for product candidates, which will result in the incurrence of significant investment with no assurance that such investment will be recouped.
While we believe we currently have sufficient large scale manufacturing capacity to meet our near-term manufacturing requirements, it is probable that we would need additional large scale manufacturing capacity to support future clinical and commercial manufacturing requirements for product candidates in our pipeline, if such candidates are successful and approved. We are building a large scale biologics manufacturing facility in Solothurn, Switzerland and acquired an additional manufacturing facility in Research Triangle Park, North Carolina. Due to the long lead times necessary for the expansion of manufacturing capacity, we expect to incur significant investment to build or expand our facilities or obtain third-party contract manufacturers with no assurance that such investment will be recouped. If we are unable to adequately and timely manufacture and supply our products and product candidates or if we do not fully utilize our manufacturing facilities, our business may be harmed.
Our investment in Samsung Bioepis, and our success in commercializing biosimilars developed by Samsung Bioepis, are subject to risks and uncertainties inherent in the development, manufacture and commercialization of biosimilars.
Our investment in Samsung Bioepis, and our success in commercializing biosimilars developed by Samsung Bioepis, are subject to a number of risks, including:
Reliance on Third Parties. We are dependent on the efforts of Samsung Bioepis and other third parties over whom we have limited or no control in the development and manufacturing of biosimilars products. If Samsung Bioepis or such other third parties fail to perform successfully, we may not realize the anticipated benefits of our investment in Samsung Bioepis;
Regulatory Compliance. Biosimilar products may face regulatory hurdles or delays due to the evolving and uncertain regulatory and commercial pathway of biosimilars products in certain jurisdictions;

Intellectual Property and Regulatory Challenges. Biosimilar products may face extensive patent clearances, patent infringement litigation, injunctions or regulatory challenges, which could prevent the commercial launch of a product or delay it for many years;
Failure to Gain Market and Patient Acceptance. Market success of biosimilar products will be adversely affected if patients, physicians and payers do not accept biosimilar products as safe and efficacious products offering a more competitive price or other benefit over existing therapies;
Ability to Provide Adequate Supply. Manufacturing biosimilars is complex. If we encounter any manufacturing or supply chain difficulties, we may be unable to meet higher than anticipated demand; and
Competitive Challenges. Biosimilar products face significant competition, including from innovator products and from biosimilar products offered by other companies. In some jurisdictions, local tendering processes may restrict biosimilar products from being marketed and sold in those jurisdictions. The number of competitors in a jurisdiction, the timing of approval and the ability to market biosimilar products successfully in a timely and cost-effective matter are additional factors that may impact our success and/or the success of Samsung Bioepis in this business area.
Our investments in properties may not be fully realized.
We own or lease real estate primarily consisting of buildings that contain research laboratories, office space and manufacturing operations. For strategic or other operational reasons, we may decide to further consolidate or co-locate certain aspects of our business operations or dispose of one or more of our properties, some of which may be located in markets that are experiencing high vacancy rates and decreasing property values. If we determine that the fair value of any of our owned properties is lower than their book value we may not realize the full investment in these properties and incur significant impairment charges or additional depreciation when the expected useful lives of certain assets have been shortened due to the anticipated closing of facilities. If we decide to fully or partially vacate a leased property, such as ceasing manufacturing at our facility in Cambridge, Massachusetts, we may incur significant cost, including facility closing costs, employee separation and retention expenses, lease termination fees, rent expense in excess of sublease income and impairment of leasehold improvements and accelerated depreciation of assets. Any of these events may have an adverse impact on our results of operations.
Our portfolio of marketable securities is subject to market, interest and credit risk that may reduce its value.
We maintain a portfolio of marketable securities for investment of our cash. Changes in the value of our portfolio of marketable securities could adversely affect our earnings. In particular, the value of our investments may decline due to increases in interest rates, downgrades of the bonds and other securities included in our portfolio, instability in the global financial markets that reduces the liquidity of securities included in our portfolio, declines in the value of collateral underlying the securities included in our portfolio and other factors. Each of these events may cause us to record charges to reduce the carrying value of our investment portfolio or sell investments for less than our acquisition cost. Although we attempt to mitigate these risks through diversification of our investments and continuous monitoring of our portfolio's overall risk profile, the value of our investments may nevertheless decline.
There can be no assurance that we will continue to repurchase stock or that we will repurchase stock at favorable prices.
From time to time our Board of Directors authorizes stock repurchase programs, including most recently a $5.0 billion stock repurchase program in July 2016. The amount and timing of stock repurchases are subject to capital availability and our determination that stock repurchases are in the best interest of our stockholders and are in compliance with all respective laws and our agreements applicable to the repurchase of stock. Our ability to repurchase stock will depend upon, among other factors, our cash balances and potential future capital requirements for strategic transactions, results of operations, financial condition and other factors beyond our control that we may deem relevant. A reduction in, or the completion or expiration of, our stock repurchase programs could have a negative effect on our stock price. We can provide no assurance that we will repurchase stock at favorable prices, if at all.

We may not be able to access the capital and credit markets on terms that are favorable to us.
We may seek access to the capital markets to supplement our existing funds and cash generated from operations for working capital, capital expenditure and debt service requirements and other business initiatives. The capital and credit markets have experienced extreme volatility and disruption which leads to uncertainty and liquidity issues for both borrowers and investors. In the event of adverse capital and credit market conditions, we may be unable to obtain capital market financing on favorable terms. Changes in credit ratings issued by nationally recognized credit rating agencies could also adversely affect our cost of financing and the market price of our securities.
Our business involves environmental risks, which include the cost of compliance and the risk of contamination or injury.
Our business and the business of several of our strategic partners involve the controlled use of hazardous materials, chemicals, biologics and radioactive compounds. Although we believe that our safety procedures for handling and disposing of such materials comply with state, federal and foreign standards, there will always be the risk of accidental contamination or injury. If we were to become liable for an accident, or if we were to suffer an extended facility shutdown, we could incur significant costs, damages and penalties that could harm our business. Manufacturing of our products and product candidates also requires permits from government agencies for water supply and wastewater discharge. If we do not obtain appropriate permits, including permits for sufficient quantities of water and wastewater, we could incur significant costs and limits on our manufacturing volumes that could harm our business.
The illegal distribution and sale by third parties of counterfeit versions of our products or stolen products could have a negative impact on our reputation and business.
Third parties might illegally distribute and sell counterfeit or unfit versions of our products, which do not meet our rigorous manufacturing, distribution and testing standards. A patient who receives a counterfeit or unfit drug may be at risk for a number of dangerous health consequences. Our reputation and business could suffer harm as a result of counterfeit or unfit drugs sold under our brand name. Stolen inventory that is not properly stored or sold through unauthorized channels could adversely impact patient safety, our reputation and our business. In addition, inventory that is stolen from warehouses, plants or while in-transit, and that is subsequently improperly stored and sold through unauthorized channels, could adversely impact patient safety, our reputation and our business.
The increasing use of social media platforms presents new risks and challenges.
Social media is increasingly being used to communicate about our products and the diseases our therapies are designed to treat. Social media practices in the biopharmaceutical industry continue to evolve and regulations relating to such use are not always clear. This evolution creates uncertainty and risk of noncompliance with regulations applicable to our business. For example, patients may use social media channels to comment on the effectiveness of a product or to report an alleged adverse event. When such disclosures occur, there is a risk that we fail to monitor and comply with applicable adverse event reporting obligations or we may not be able to defend the company or the public's legitimate interests in the face of the political and market pressures generated by social media due to restrictions on what we may say about our products. There is also a risk of inappropriate disclosure of sensitive information or negative or inaccurate posts or comments about us on any social networking website. If any of these events were to occur or we otherwise fail to comply with applicable regulations, we could incur liability, face overly restrictive regulatory actions or incur other harm to our business.
Some of our collaboration agreements contain change in control provisions that may discourage a third party from attempting to acquire us.
Some of our collaboration agreements include change in control provisions that could reduce the potential acquisition price an acquirer is willing to pay or discourage a takeover attempt that could be viewed as beneficial to shareholders. Upon a change in control, some of these provisions could trigger reduced milestone, profit or royalty payments to us or give our collaboration partner rights to terminate our collaboration agreement, acquire operational control or force the purchase or sale of the programs that are the subject of the collaboration. 
Item  1B.     Unresolved Staff Comments
None.

Item  2.     Properties
Below is a summary of our owned and leased properties as of December 31, 2016.
Massachusetts
In Cambridge, Massachusetts, we own approximately 508,000 square feet of real estate space, consisting of a building that houses a research laboratory and a cogeneration plant totaling approximately 263,000 square feet and a building that contains research, development and quality laboratories which total approximately 245,000 square feet.
In addition, we lease a total of approximately 1,250,000 square feet in Massachusetts, which is summarized as follows:
893,000 square feet in Cambridge, Massachusetts, which is comprised of a 67,000 square foot biologics manufacturing facility, which is subleased by Brammer, and 826,000 square feet for our corporate headquarters, laboratory and additional office space; and
357,000 square feet of office space in Weston, Massachusetts, of which 175,000 square feet has been subleased through the remaining term of our lease agreement.
Our Massachusetts lease agreements expire at various dates through the year 2028.
North Carolina
In RTP, North Carolina, we own approximately 834,000 square feet of real estate space, which is summarized as follows:
357,000 square feet of laboratory and office space;
175,000 square feet related to a large-scale biologics manufacturing facility;
105,000 square feet related to a biologics manufacturing facility;
84,000 square feet of warehouse space and utilities; 
70,000 square feet related to a parenteral fill-finish facility; and
43,000 square feet related to a large-scale purification facility.
In addition, we lease 188,000 square feet of a facility in RTP, North Carolina from Eisai to manufacture our and Eisai's oral solid dose products and 40,000 square feet of warehouse space in Durham, North Carolina.
Denmark
We own a large-scale biologics manufacturing facility totaling approximately 228,000 square feet located in Hillerød, Denmark.
We also own approximately 306,000 square feet of additional space, which is summarized as follows:
139,000 square feet of warehouse, utilities and support space;
70,000 square feet related to a label and packaging facility;
50,000 square feet related to a laboratory facility; and
47,000 square feet of administrative space.
Switzerland
In December 2015 we acquired land in Solothurn, Switzerland where we are building a biologics manufacturing facility in the Commune of Luterbach over the next several years.
Other International
We lease office space in Zug, Switzerland, our international headquarters, the U.K., Germany, France, Denmark and numerous other countries. Our international lease agreements expire at various dates through the year 2028.

Item  3.     Legal Proceedings
For a discussion of legal matters as of December 31, 2016, please read Note 20, Litigation to our consolidated financial statements included in this report, which is incorporated into this item by reference.
Item  4.     Mine Safety Disclosures
Not applicable.

PART II
Item 5.     Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities
Market and Stockholder Information
Our common stock trades on The NASDAQ Global Select Market under the symbol “BIIB.” The following table shows the high and low sales price for our common stock as reported by The NASDAQ Global Select Market for each quarter in the years ended December 31, 2016 and 2015:
 Common Stock Price
 2016 2015
 High Low High Low
First Quarter$301.02
 $242.07
 $480.18
 $334.40
Second Quarter$292.69
 $223.02
 $432.88
 $368.88
Third Quarter$333.65
 $240.07
 $412.24
 $265.00
Fourth Quarter$329.83
 $268.00
 $311.65
 $254.00
As of January 27, 2017, there were approximately 700 stockholders of record of our common stock.
Dividends
We have not paid cash dividends since our inception. While we historically have not paid cash dividends and do not have a current intention to pay cash dividends, we continually review our capital allocation strategies, including, among other things, payment of cash dividends, stock repurchases or acquisitions.
Issuer Purchases of Equity Securities
In July 2016 our Board of Directors authorized a program to repurchase up to $5.0 billion of our common stock (2016 Share Repurchase Program). This authorization does not have an expiration date. Repurchased shares will be retired.
The following table summarizes our common stock repurchase activity under our 2016 Share Repurchase Program during the fourth quarter of 2016:
Period
Total Number of
Shares Purchased
(#)
 
Average Price
Paid per Share
($)
 
Total Number of
Shares Purchased
as Part of Publicly
Announced  Programs
(#)
 
Maximum
Approximate Dollar Value
of Shares That May Yet Be
Purchased Under
Our Programs ($ in millions)
October 20161,254,818
 298.71
 1,254,818
 $4,276.3
November 2016939,046
 294.24
 939,046
 $4,000.0
December 2016
 
 
 $4,000.0
Total2,193,864
 296.80
    
As of December 31, 2016, we repurchased and retired approximately 3.3 million shares of common stock at a cost of $1.0 billion under the 2016 Share Repurchase Program.
In February 2011 our Board of Directors authorized a program to repurchase up to 20.0 million shares of our common stock (2011 Share Repurchase Program), which has been used principally to offset common stock issuances under our share-based compensation plans. The 2011 Share Repurchase Program does not have an expiration date. We did not repurchase any shares of common stock under our 2011 Share Repurchase Program during the year ended December 31, 2016, and have approximately 1.3 million shares remaining available for repurchase under this authorization.


Stock Performance Graph
The graph below compares the five-year cumulative total stockholder return on our common stock, the S&P 500 Index, the Nasdaq Pharmaceutical Index and the Nasdaq Biotechnology Index assuming the investment of $100.00 on December 31, 2011 with dividends being reinvested. The stock price performance in the graph below is not necessarily indicative of future price performance.
 201120122013201420152016
Biogen Inc.100.00
133.00
254.04
308.45
278.37
257.68
NASDAQ Pharmaceutical100.00
114.32
155.11
188.95
199.22
197.05
S&P 500 Index100.00
116.00
153.57
174.60
177.01
198.18
NASDAQ Biotechnology100.00
132.74
220.37
296.19
331.05
260.37

Item 6.     Selected Financial Data
BIOGEN INC. AND SUBSIDIARIES
SELECTED FINANCIAL DATA
Our results of operations are summarized as follows:
 For the Years Ended December 31,
 2016 2015 2014 2013 2012
(In millions, except per share amounts)(d) (e) (d) (f) (g) (h)
Results of Operations         
Product revenues, net (a)
$9,817.9
 $9,188.5
 $8,203.4
 $5,542.3
 $4,166.1
Revenues from anti-CD20 therapeutic programs1,314.5
 1,339.2
 1,195.4
 1,126.0
 1,137.9
Other revenues316.4
 236.1
 304.5
 263.9
 212.5
Total revenues11,448.8
 10,763.8
 9,703.3
 6,932.2
 5,516.5
Total cost and expenses6,298.4
 5,872.8
 5,747.7
 4,441.6
 3,707.4
Gain on sale of rights
 
 16.8
 24.9
 46.8
Income from operations5,150.4
 4,891.0
 3,972.4
 2,515.5
 1,855.9
Other income (expense), net(217.4) (123.7) (25.8) (34.9) (0.7)
Income before income tax expense and equity in loss of investee, net of tax4,933.0
 4,767.3
 3,946.6
 2,480.6
 1,855.1
Income tax expense1,237.3
 1,161.6
 989.9
 601.0
 470.6
Equity in loss of investee, net of tax
 12.5
 15.1
 17.2
 4.5
Net income3,695.7
 3,593.2
 2,941.6
 1,862.3
 1,380.0
Net income (loss) attributable to noncontrolling interests, net of tax(7.1) 46.2
 6.8
 
 
Net income attributable to Biogen Inc.$3,702.8
 $3,547.0
 $2,934.8
 $1,862.3
 $1,380.0
          
Diluted Earnings Per Share         
Diluted earnings per share attributable to Biogen Inc.$16.93
 $15.34
 $12.37
 $7.81
 $5.76
Weighted-average shares used in calculating diluted earnings per share attributable to Biogen Inc.218.8
 231.2
 237.2
 238.3
 239.7
          
Our financial condition is summarized as follows:
 As of December 31,
 2016 2015 2014 2013 2012
(In millions)         
Financial Condition         
Cash, cash equivalents and marketable securities$7,724.5
 $6,188.9
 $3,316.0
 $1,848.5
 $3,742.4
Total assets$22,876.8
 $19,504.8
 $14,314.7
 $11,863.3
 $10,130.1
Notes payable and other financing arrangements, less current portion (b)
$6,512.7
 $6,521.5
 $580.3
 $592.4
 $687.4
Total Biogen Inc. shareholders’ equity (c)
$12,140.1
 $9,372.8
 $10,809.0
 $8,620.2
 $6,961.5
In addition to the following notes, the financial data included within the tables above should be read in conjunction with our consolidated financial statements and related notes and the “Management’s Discussion and Analysis of Financial Condition and Results of Operations” sections of this report and our previously filed Form 10-Ks.
(a)Product revenues, net reflect the impact of the following product launches:
Commercial sales of SPINRAZA began in the fourth quarter of 2016.

Under the terms of our collaboration agreement with AbbVie, we began to recognize revenues on sales of ZINBRYTA to third parties in the E.U. in the third quarter of 2016.
Under the terms of our commercial agreement with Samsung Bioepis, we began to recognize revenues on sales of BENEPALI and FLIXABI to third parties in the E.U. in the first quarter of 2016 and third quarter of 2016, respectively.
Commercial sales of ALPROLIX commenced in the second quarter of 2014 and commercial sales of ELOCTATE and PLEGRIDY commenced in the third quarter of 2014.
TECFIDERA began in April 2013.
(b)Notes payable and other financing arrangements reflects the issuance of our senior unsecured notes for an aggregate principal amount of $6.0 billion in September 2015, and the 2013 repayment of our 6.0% notes that were issued in 2008 for an aggregate principal amount of $450.0 million.
(c)Total Biogen Inc.'s shareholders' equity reflects the repurchase of approximately 32.8 million shares of our common stock at a cost of approximately $8.3 billion between 2012 and 2016:
During 2016 we repurchased and retired approximately 3.3 million shares of our common stock at a cost of $1.0 billion under our 2016 Share Repurchase Program.
During 2015 we repurchased and retired approximately 16.8 million shares of our common stock at a cost of $5.0 billion under our 2015 Share Repurchase Program.
During 2014, 2013 and 2012 we repurchased approximately 2.9 million, 2.0 million and 7.8 million shares, respectively of our common stock at a cost of approximately $2.3 billion under our 2011 Share Repurchase Program of which approximately 3.7 million of these shares were retired.
(d)Total cost and expenses for the years ended December 31, 2016 and 2015, include restructuring charges of $33.1 million and $93.4 million, respectively. In addition, total cost and expenses for the year ended December 31, 2016, also include charges to cost of sales totaling $52.4 million of expenses incurred as a result of our determination to vacate and cease manufacturing in our small-scale biologics facility in Cambridge, MA as well as vacate our warehouse in Somerville, MA. Total cost and expenses for year ended December 31, 2016, also include $18.1 million of costs incurred directly related to our separation of our hemophilia business into an independent, publicly traded company.
(e)Total cost and expenses for the year ended December 31, 2016, includes a pre-tax charge of $454.8 million related to the January 2017 settlement and license agreement with Forward Pharma A/S (Forward Pharma).
(f)In June 2014 AIFA approved a resolution affirming that there is no reimbursement limit from and after February 2013. As a result, we recognized $53.5 million of TYSABRI revenues was primarily duein the second quarter of 2014 related to price increasesthe periods beginning February 2013 that were previously deferred.
(g)Our share of revenues from anti-CD20 therapeutic programs reflects charges of $49.7 million in 2013 for damages and our recognition, startinginterest awarded to Hoechst in AprilGenentech's arbitration with Hoechst for RITUXAN.
(h)Commencing in the second quarter of 2013 ofproduct and total revenues include 100% of net revenues onrelated to sales of TYSABRI in-market sales due toas a result of our acquisition of theall remaining rights to TYSABRI from Elan partially offset by a 4% decrease in unit sales volume. For 2013 compared to 2012Pharma International, Ltd (Elan), an affiliate of Elan Corporation, plc. Upon the increase in U.S. TYSABRI revenuesclosing, our collaboration agreement was primarily due to our acquisitionterminated, and we no longer record collaboration profit sharing expense. We recognized collaboration profit sharing expense of $85.4 million and $317.9 million during the remaining rights to TYSABRI from Elan, price increases and a 1% increase in unit sales volume, which includes the impact of patients transitioning to TECFIDERA.
Based on data reported by Elan foryears ended December 31, 2013 and 2012, and our sales to third party customers, total U.S. TYSABRI in-market sales were $958.3 million and $886.0 million for 2013 and 2012, respectively. For 2014 compared to 2013, the increase in U.S. TYSABRI in-market sales was primarily due to price increases, partially offset by patients transitioning to oral therapies including TECFIDERA. For 2013 compared to 2012, the increase in in-market sales was due to price increases.

Item 7.     Management’s Discussion and Analysis of Financial Condition and Results of Operations
The following discussion should be read in conjunction with our consolidated financial statements and related notes beginning on page F-1 of this report. Certain totals may not sum due to rounding.
Executive Summary
Introduction
Biogen is a global biopharmaceutical company focused on discovering, developing, manufacturing and delivering therapies to people living with serious neurological, rare and autoimmune diseases.
Our marketed products include TECFIDERA, AVONEX, PLEGRIDY, TYSABRI, ZINBRYTA and FAMPYRA for multiple sclerosis (MS), FUMADERM for the treatment of severe plaque psoriasis and SPINRAZA for the treatment of spinal muscular atrophy (SMA). We also have certain business and financial rights with respect to RITUXAN for the treatment of non-Hodgkin's lymphoma, chronic lymphocytic leukemia (CLL) and other conditions, GAZYVA indicated for the treatment of CLL and follicular lymphoma, and other potential anti-CD20 therapies under a collaboration agreement with Genentech, Inc. (Genentech), a wholly-owned member of the Roche Group.
In May 2016 we announced our intention to spin off our hemophilia business, Bioverativ Inc. (Bioverativ), as an independent, publicly traded company. Bioverativ will focus on the discovery, development and commercialization of therapies for the treatment of hemophilia and other blood disorders, including ELOCTATE for the treatment of hemophilia A and ALPROLIX for the treatment of hemophilia B. Bioverativ will also assume all of our rights and obligations under our collaboration agreement with Swedish Orphan Biovitrum AB (Sobi) and our collaboration and license agreement with Sangamo Biosciences Inc. (Sangamo).
On February 1, 2017, we completed the distribution of all the then outstanding shares of common stock of Bioverativ to Biogen stockholders, who received one share of Bioverativ common stock for every two shares of Biogen common stock. As a result of the distribution, Bioverativ is now an independent public company whose shares of common stock are trading under the symbol "BIVV"
on the Nasdaq Global Select Market.
The financial results of Bioverativ are included in our consolidated results of operations and financial position in our audited consolidated financial statements for the periods presented in this Form 10-K. The financial results of Bioverativ will be excluded from our consolidated results of operations and financial position commencing February 1, 2017. For additional information regarding the separation of Bioverativ, please read Note 26, Subsequent Events to our consolidated financial statements included in this report.
Our current revenues depend upon continued sales of our principal products and, unless we develop, acquire rights to, and commercialize new products and technologies, we may be substantially dependent on sales from our principal products for many years. Further, following the completion of the spin-off of our hemophilia business, our revenues will be further reliant and concentrated on sales of our MS products in an increasingly competitive market.
In the longer term, our revenue growth will be dependent upon the successful clinical development, regulatory approval and launch of new commercial products as well as additional indications for our existing products, our ability to obtain and maintain patents and other rights related to our marketed products, assets originating from our research and development efforts and successful execution of external business development opportunities.
We support our drug discovery and development efforts through the commitment of significant resources to discovery, research and development programs and business development opportunities, particularly within areas of our scientific, manufacturing and technical capabilities. For nearly two decades we have led in the research and development of new therapies to treat MS, resulting in our leading portfolio of MS treatments. Now our research is focused on additional improvements in the treatment of MS, such as, the development of next generation therapies for MS with a goal to reverse or possibly repair damage caused by the disease. We are also applying our scientific expertise to solve some of the most challenging and complex diseases, including Alzheimer's disease, Parkinson's disease and amyotrophic lateral sclerosis (ALS), and are employing innovative technologies to discover potential treatments for rare and genetic disorders, including new ways of treating diseases through gene therapy.
Our innovative drug development and commercialization activities are complemented by our biosimilar therapies that expand access to medicines and reduce the cost burden for healthcare systems. We are leveraging our manufacturing capabilities and know-how by developing, manufacturing and marketing


biosimilars through Samsung Bioepis, our joint venture with Samsung BioLogics Co. Ltd. (Samsung Biologics). Under our commercial agreement with Samsung Bioepis, we market and sell BENEPALI, an etanercept biosimilar referencing ENBREL, and FLIXABI, an infliximab biosimilar referencing REMICADE, in the European Union (E.U.).
Financial Highlights
Diluted earnings per share attributable to Biogen Inc. were $16.93 for 2016, representing an increase of 10.4% over the same period in 2015.
As described below under “Results of Operations,” our income from operations for the year ended December 31, 2016, reflects the following:
Total revenues were $11,448.8 million for 2016, representing an increase of 6.4% over the same period in 2015.
Product revenues, net totaled $9,817.9 million for 2016, representing an increase of 6.8% over the same period in 2015. This increase was driven by a 9.1% increase in worldwide TECFIDERA revenues, a 52.8% increase in worldwide hemophilia revenues, a 4.1% increase in worldwide TYSABRI revenues and revenues from BENEPALI. These increases are partially offset by a 5.8% decrease in worldwide Interferon revenues. Product revenues, net for
2016, compared to the same period in 2015, were also negatively impacted by a $167.8 million decrease in hedge gains recognized under our foreign currency hedging program in comparative periods.
Revenues from anti-CD20 therapeutic programs totaled $1,314.5 million for 2016, representing a decrease of 1.8% over the same period in 2015.
Other revenues totaled $316.4 million for 2016, representing an increase of 34.0% from the same period in 2015. This increase was primarily driven by an increase in other corporate revenues, which includes amounts earned with respect to our contract manufacturing activities.
Total cost and expenses totaled $6,298.4 million for 2016, representing an increase of 7.2%, compared to the same period in 2015. This increase was driven by a $454.8 million litigation settlement and license charge and a 19.2% increase in cost of sales, which includes a charge of $45.5 million for accelerated depreciation as a result of the determination to cease manufacturing in Cambridge, MA and vacate our biologics manufacturing facility in Cambridge, MA and warehouse space in Somerville, MA. These increases were partially offset by a 7.8% decrease in selling, general and administrative expenses and a decrease in restructuring charges.
We generated $4,522.4 million of net cash flows from operations for 2016, which were primarily driven by earnings. Cash, cash equivalents and marketable securities totaled approximately $7,724.5 million as of December 31, 2016.
During the year ended December 31, 2016, we repurchased and retired approximately 3.3 million shares of common stock at a cost of $1.0 billion under our share repurchase programs.
Collaborative and Other Relationships
In May 2016 we entered into a collaboration and alliance with the University of Pennsylvania (UPenn) to advance gene therapy and gene editing technologies. For additional information related to this transaction, please read Note 19, Collaborative and Other Relationships to our consolidated financial statements included in this report.


Restructuring and Cost Saving Initiatives
During the third quarter of 2016 we initiated cost saving measures primarily intended to realign our organizational structure due to the changes in roles and workforce resulting from our decision to spin off our hemophilia business, and to achieve further targeted cost reductions.
Additionally, in connection with the transaction to sublease our rights to the manufacturing facility in Cambridge, MA to Brammer Bio MA, LLC (Brammer), certain employees were separated from Biogen.
For additional information related to our restructuring and cost saving initiatives, please read Note 3, Restructuring, Business Transformation and Other Cost Saving Initiatives to our consolidated financial statements included in this report.
Business Environment
The biopharmaceutical industry and the markets in which we operate are intensely competitive. Many of our competitors are working to develop or have commercialized products similar to those we market or are developing. In addition, the commercialization of certain of our own approved MS products, products of our collaborators and pipeline product candidates may negatively impact future sales of our existing MS products. Our products may also face increased competitive pressures from the introduction of generic versions, prodrugs of existing therapeutics or biosimilars of existing products and other technologies, such as gene therapies and bispecific antibodies.
In addition, sales of our products are dependent, in large part, on the availability and extent of coverage, pricing and reimbursement from government health administration authorities, private health insurers and other organizations. Drug prices are under significant scrutiny in the markets in which our products are prescribed. Drug pricing and other health care costs continue to be subject to intense political and societal pressures.
For additional information related to our competition and pricing risks that could negatively impact our product sales, please read the “Risk Factors” section of this report.

Results of Operations
Revenues
Revenues are summarized as follows:
 
For the Years Ended
December 31,
 % Change
 2016 compared to 2015 2015 compared to 2014
(In millions, except percentages)2016 2015 2014 
Product Revenues:         
United States$7,050.4
 $6,545.8
 $5,566.7
 7.7 % 17.6 %
Rest of world2,767.5
 2,642.7
 2,636.7
 4.7 % 0.2 %
Total product revenues9,817.9
 9,188.5
 8,203.4
 6.8 % 12.0 %
Revenues from anti-CD20 therapeutic programs1,314.5
 1,339.2
 1,195.4
 (1.8)% 12.0 %
Other revenues316.4
 236.1
 304.5
 34.0 % (22.5)%
Total revenues$11,448.8
 $10,763.8
 $9,703.3
 6.4 % 10.9 %

Product Revenues
Product revenues are summarized as follows:
 
For the Years Ended
December 31,
 % Change
 2016 compared to 2015 2015 compared to 2014
(In millions, except percentages)2016 2015 2014 
Multiple Sclerosis:         
TECFIDERA$3,968.1
 $3,638.4
 $2,909.2
 9.1 % 25.1 %
Interferon*2,795.2
 2,968.7
 3,057.6
 (5.8)% (2.9)%
TYSABRI1,963.8
 1,886.1
 1,959.5
 4.1 % (3.7)%
FAMPYRA84.9
 89.7
 80.2
 (5.4)% 11.8 %
ZINBRYTA7.8
 
 
 **
 **
Hemophilia:         
ELOCTATE513.2
 319.7
 58.4
 60.5 % 447.4 %
ALPROLIX333.7
 234.5
 76.0
 42.3 % 208.6 %
Other product revenues:         
FUMADERM45.9
 51.4
 62.5
 (10.7)% (17.8)%
SPINRAZA4.6
 
 
 **
 **
BENEPALI100.6
 
 
 **
 **
FLIXABI0.1
 
 
 **
 **
Total product revenues$9,817.9
 $9,188.5
 $8,203.4
 6.8 % 12.0 %
* Interferon includes AVONEX and PLEGRIDY.
** Percentage not meaningful.

Multiple Sclerosis (MS)

40


For 2014 compared to 2013, the increase in rest of world TYSABRI revenues was primarily due to the recognition of $53.5 million of revenue previously deferred in Italy relating to the pricing agreement with the Italian National Medicines Agency (Agenzia Italiana del Farmaco or AIFA) as discussed below, volume increases in Europe of 10% and in the Emerging Markets region of 18% and a favorable net price in Germany as the mandatory rebate percentage was reduced. Rest of world TYSABRI revenue for 2014 compared to 2013 also reflects the negative impact of foreign currency exchange rate changes experienced in 2014, partially offset by gains recognized in relation to the settlement of certain cash flow hedge instruments under our foreign currency hedging program. For 2013 compared to 2012, the decrease in rest of world TYSABRI revenues was primarily due to pricing reductions from austerity measures enacted in some countries, a decrease in unit demand primarily in Europe and the net impact of a EUR15.4 million reduction in revenues recorded for a probable settlement of outstanding claims with AIFA relating to sales of TYSABRI in Italy in excess of a reimbursement limit for the periods between February 2009 and January 2011. Rest of world TYSABRI revenues for 2013 compared to 2012 also reflects the positive impact of foreign currency exchange rates, partially offset by losses recognized in relation to the settlement of certain cash flow hedge instruments under our foreign currency hedging program.
For information relating to our agreement with AIFA relating to sales of TYSABRI in Italy, please read Note 4, Accounts Receivable to our consolidated financial statements included in this report. As described in Note 4 to our consolidated financial statements, in June 2014, AIFA approved a resolution, effective for a 24 month term, setting the price for TYSABRI in Italy. The resolution also eliminated the reimbursement limit from February 2013 onward.
FAMPYRA
Revenues from FAMPYRA are summarized as follows:
 
For the Years Ended
December 31,
 % Change
 2014 compared to 2013 2013 compared to 2012
(In millions, except percentages)2014 2013 2012 
United States$
 $
 $
 **
 **
Rest of world80.2
 74.0
 57.4
 8.4% 28.9%
Total FAMPYRA revenues$80.2
 $74.0
 $57.4
 8.4% 28.9%
We have a license from Acorda Therapeutics, Inc. (Acorda) to develop and commercialize FAMPYRA in all markets outside the U.S. For information about our relationship with Acorda, please read Note 20, Collaborative and Other Relationships to our consolidated financial statements included within this report.
For 2014 compared to 2013, the increase in FAMPYRA revenue was primarily due to increased demand, partially offset by the recognition of deferred revenue in the prior year comparative period. For 2013 compared to 2012, the increase in FAMPYRA revenue was due to the recognition of previously deferred revenue and increased demand in Germany and France. FAMPYRA revenue for 2013 includes the recognition of revenues previously deferred in Germany as a result of finalizing a contract that included the final negotiated fixed price, which was higher than the lowest point of the initial range cited by the German pricing authority.
Hemophilia
ALPROLIX
Revenues from ALPROLIX are summarized as follows:AVONEX
ELOCTATE
PLEGRIDY
TYSABRI
ZINBRYTA
Other*
Hillerød, Denmark
TYSABRI
Biosimilars
* Other includes products manufactured for contract manufacturing partners
In addition to our drug substance manufacturing facilities, we have a drug product manufacturing facility and supporting infrastructure in RTP, North Carolina. This parenteral facility adds capabilities and capacity for filling biologics into vials.
We also lease from Eisai an oral solid dose products manufacturing facility in RTP, North Carolina, where we manufacture TECFIDERA and other oral solid dose products, including products for Eisai. This facility supplements our outsourced small molecule manufacturing capabilities. Under our lease arrangement, Eisai may provide us with packaging services for oral solid dose products. In August 2015 we agreed to purchase this facility following the expiration of our current three-year lease in the third quarter of 2018 and Eisai's completion of certain activities.
For a period of time following the spin-off of Bioverativ, we agreed to manufacture and supply, exclusively for Bioverativ, drug substance, drug product and finished goods with respect to ELOCTATE and ALPROLIX and pipeline product candidates.
Genentech is responsible for all worldwide manufacturing activities for bulk RITUXAN and GAZYVA and has sourced the manufacture of certain bulk RITUXAN and GAZYVA requirements to a third party, Acorda Therapeutics supplies FAMPYRA to us pursuant to its supply agreement with Alkermes, Inc. and Ionis supplies the active pharmaceutical ingredient (API) for SPINRAZA.
Third-Party Suppliers and Manufacturers
We principally use third parties to manufacture the API, except as noted above for SPINRAZA, and, to a lesser extent, the final product for our small molecule products and product candidates, including TECFIDERA and FUMADERM and the final drug product for our large molecule products and product candidates, including SPINRAZA.
We source all of our fill-finish and the majority of final product assembly and storage operations for our products, along with a substantial part of our packaging operations, to a concentrated group of third-party contract manufacturing organizations. We have internal label and packaging capability for clinical and commercial products at our Hillerød facility. Raw materials, delivery devices, such as syringes and auto-injectors, and other supplies required for the production of our products and product candidates are procured from various third-party suppliers and manufacturers in quantities adequate to meet our needs. Continuity of supply of such raw materials, devices and supplies is assured using a strategy of dual sourcing where possible or by a risk-based inventory strategy. Our third-party service providers, suppliers and manufacturers may be subject to routine cGMP inspections by the FDA or comparable agencies in other jurisdictions and undergo assessment and certification by our quality management group.


Our Employees
As of December 31, 2016, we had approximately 7,400 employees worldwide.
Our Executive Officers (as of February 2, 2017)
Officer Current Position Age Year Joined Biogen
Michel Vounatsos Chief Executive Officer 55 2016
Susan H. Alexander Executive Vice President, Chief Legal Officer and Corporate Secretary 60 2006
Paul J. Clancy Executive Vice President, Finance and Chief Financial Officer 55 2001
Gregory F. Covino Vice President, Finance and Chief Accounting Officer 51 2012
Michael D. Ehlers Executive Vice President, Research and Development 48 2016
Paul McKenzie Executive Vice President, Pharmaceutical Operations and Technology 51 2016
Kenneth DiPietro Executive Vice President, Human Resources 58 2012
Adriana (Andi) Karaboutis Executive Vice President, Technology, Business Solutions and Corporate Affairs 54 2014
Alfred W. Sandrock, Jr., M.D., Ph.D. Chief Medical Officer and Executive Vice President of Neurology Discovery and Development 59 1998
 
For the Years Ended
December 31,
 % Change
 2014 compared to 2013 2013 compared to 2012
(In millions, except percentages)2014 2013 2012 
United States (1)$72.1
 $
 $
 ** **
Rest of world (2)3.9
 
 
 ** **
Total ALPROLIX revenues$76.0
 $
 $
 ** **
(1)U.S. sales began in the second quarter of 2014.
Michel Vounatsos
Experience
Mr. Vounatsos has served as our Chief Executive Officer since January 2017. Prior to that, from April 2016 to December 2016, Mr. Vounatsos served as our Executive Vice President and Chief Commercial Officer. Prior to joining Biogen, Mr. Vounatsos spent 20 years at Merck where he most recently served as President, Primary Care, Customer Business Line. In this role, he led Merck’s global primary care business unit, a role which encompassed Merck’s cardiology-metabolic, general medicine, women’s health and biosimilars groups and developed and instituted a strategic framework for enhancing the company’s relationships with key constituents, including the most significant providers, payers and retailers and the world’s largest governments. Mr. Vounatsos previously held leadership positions across Europe and in China for Merck. Prior to that, Mr. Vounatsos held management positions at Ciba-Geigy.
Education
lUniversite Victor Segalen, Bordeaux II, France, C.S.C.T. Certificate in Medicine
lHEC School of Management - Paris, M.B.A.
(2)Japanese sales began in the fourth quarter of 2014.

41


ELOCTATE
Revenues from ELOCTATE are summarized as follows:
 
For the Years Ended
December 31,
 % Change
 2014 compared to 2013 2013 compared to 2012
(In millions, except percentages)2014 2013 2012 
United States (1)$58.4
 $
 $
 ** **
Rest of world
 
 
 ** **
Total ELOCTATE revenues$58.4
 $
 $
 ** **
Susan H. Alexander
Experience
Ms. Alexander has served as our Executive Vice President, Chief Legal Officer and Corporate Secretary since December 2011. Prior to that, from 2006 to December 2011, Ms. Alexander served as our Executive Vice President, General Counsel and Corporate Secretary. From 2003 to January 2006, Ms. Alexander served as the Senior Vice President, General Counsel and Corporate Secretary of PAREXEL International Corporation, a biopharmaceutical services company. From 2001 to 2003, Ms. Alexander served as General Counsel of IONA Technologies, a software company. From 1995 to 2001, Ms. Alexander served as Counsel at Cabot Corporation, a specialty chemicals and performance materials company. Prior to that, Ms. Alexander was a partner at the law firms of Hinckley, Allen & Snyder and Fine & Ambrogne.
Public Company Boards
lBoard of Directors of Invacare Corporation, a medical and healthcare product company
Education
lWellesley College, B.A
lBoston University School of Law, J.D.
(1)U.S. sales began in the third quarter of 2014.
Other Product Revenues
Other product revenues are summarized as follows:

 
For the Years Ended
December 31,
 % Change
 2014 compared to 2013 2013 compared to 2012
(In millions, except percentages)2014 2013 2012 
FUMADERM$62.5
 $60.2
 $59.7
 3.8% 0.8%
Unconsolidated Joint
Paul J. Clancy
Experience
Mr. Clancy has served as our Executive Vice President, Finance and Chief Financial Officer since August 2007. Mr. Clancy joined Biogen, Inc. in 2001 and has held several senior executive positions with us, including Vice President of Business Revenues
We collaboratePlanning, Portfolio Management and U.S. Marketing, and Senior Vice President of Finance with Genentech,responsibilities for leading the Treasury, Tax, Investor Relations and Business Planning groups. Prior to that, he spent 13 years at PepsiCo, a food and beverage company, serving in a range of financial and general management positions.
Public Company Boards
lBoard of Directors of Agios Pharmaceuticals, Inc., a wholly-owned memberbiopharmaceutical company
lBoard of the Roche Group, on the developmentDirectors of Incyte Corporation, a biopharmaceutical company
Education
lBabson College, B.S. in Finance
lColumbia University, M.B.A.
Gregory F. Covino
Experience
Mr. Covino has served as our Vice President, Finance and commercialization of RITUXAN. In addition, in the U.S. we share operating profitsChief Accounting Officer since April 2012. Prior to that, Mr. Covino served at Boston Scientific Corporation, a medical device company, as Vice President, Corporate Analysis and losses relating to GAZYVA with Genentech. The Roche Group and its sub-licensees maintain soleControl since March 2010, having responsibility for the development, manufacturingcompany's internal audit function, and commercializationas Vice President, Finance, International from February 2008 to March 2010, having responsibility for the financial activities of GAZYVAthe company's international division. Prior to that, Mr. Covino held several finance positions at Hubbell Incorporated, an electrical products company, including Vice President, Chief Accounting Officer and Controller from 2002 to January 2008, Interim Chief Financial Officer from 2004 to 2005, and Director, Corporate Accounting from 1999 to 2002.
Education
lBryant University, B.S. in the U.S. For additional information related to this collaboration, including information regarding the pre-tax profit sharing formula and its impact on future unconsolidated joint business revenues, please read Note 20, Collaborative and Other Relationships to our consolidated financial statements included within this report.
Revenues from unconsolidated joint business are summarized as follows:Business Administration
 
For the Years Ended
December 31,
 % Change
 2014 compared to 2013 2013 compared to 2012
(In millions, except percentages)2014 2013 2012 
Biogen Idec's share of profits in the U.S. for RITUXAN and GAZYVA (1)$1,114.1
 $1,085.2
 $1,031.7
 2.7% 5.2 %
Reimbursement of selling and development expenses in the U.S. for RITUXAN3.0
 2.1
 1.6
 42.9% 31.3 %
Revenue on sales in the rest of world for RITUXAN78.3
 38.7
 104.6
 102.3% (63.0)%
Total unconsolidated joint business revenues$1,195.4
 $1,126.0
 $1,137.9
 6.2% (1.0)%
(1) GAZYVA sales began
Michael D. Ehlers
Experience
Dr. Ehlers has served as our Executive Vice President, Head of R&D since May 2016. Prior to joining Biogen, Dr. Ehlers served in leadership positions at Pfizer, Inc., including Senior Vice President & Head BioTherapeutics R&D and Chief Scientific Officer, Neuroscience & Pain. Prior to that, Dr. Ehlers was the fourth quarterGeorge Barth Geller Professor of 2013.
Biogen Idec’s ShareNeurobiology and an Investigator of Pre-tax Profitsthe Howard Hughes Medical Institute at Duke University Medical Center. He is the recipient of numerous awards including the Eppendorf & Science Prize in Neurobiology, the U.S.John J. Abel Award in Pharmacology, the Society for RITUXANNeuroscience Young Investigator Award, a National Institute of Mental Health MERIT Award, the National Alliance for Schizophrenia and GAZYVA
Depression Distinguished Investigator Award, and the Massachusetts Medical Society Honored Business Leader Award. In 2013, Dr. Ehlers became the 11th recipient of the Thudichum Medal of the Biochemical Society of the United Kingdom. Past recipients include two Nobel laureates. Dr. Ehlers has authored over 100 scientific papers, has served on the Editorial Boards of Annual Reviews in Medicine, Annual Reviews in Pharmacology and Toxicology, the Journal of Neuroscience, the Journal of Biological Chemistry, the Journal of Molecular and Cellular Neuroscience, and has sat on advisory committees of the National Institutes of Health.
Outside Affiliations
lPhRMA Foundation Basic Pharmacology Advisory Committee
lJanelia Research Institute Advisory Committee
lMcKnight Endowment Fund for Neuroscience Board
lWorld Economic Forum Global Agenda Council on Brain Research
Education
lCalifornia Institute of Technology, B.S. Chemistry
lThe following table provides a summaryJohn Hopkins University School of amounts comprising our shareMedicine, M.D.
lThe John Hopkins University School of pre-tax profits on RITUXAN and GAZYVA in the U.S.:Medicine, Ph.D. Neuroscience

 
For the Years Ended
December 31,
 % Change
 2014 compared to 2013 2013 compared to 2012
(In millions, except percentages)2014 2013 2012 
Product revenues, net$3,556.6
 $3,425.8
 $3,131.8
 3.8 % 9.4%
Cost and expenses771.1
 615.9
 543.7
 25.2 % 13.3%
Pre-tax profits in the U.S. for RITUXAN and GAZYVA$2,785.5
 $2,809.9
 $2,588.1
 (0.9)% 8.6%
Biogen Idec's share of pre-tax profits in the U.S. for RITUXAN and GAZYVA$1,114.1
 $1,085.2
 $1,031.7
 2.7 % 5.2%
Paul McKenzie
Experience
Dr. McKenzie has served as our Executive Vice President, Pharmaceutical Operations and Technology since July 2016. Prior to that, from February 2016 to June 2016, he served as our Senior Vice President for Global Biologics Manufacturing & Technical Operations. Prior to joining Biogen, since 2008, Dr. McKenzie held a number of positions of increasing responsibility at Johnson & Johnson (J&J), including Vice President of R&D for J&J’s Ethicon business where he led the manufacturing and technical operations team responsible for internal and external manufacturing of Janssen’s pharmaceutical portfolio. He also ran global Development for Janssen R&D, helping to manage pipeline activities from discovery through clinical development and commercialization. Prior to J&J, Dr. McKenzie also held various R&D and manufacturing positions at Bristol-Myers Squibb and Merck & Co.
Education
lUniversity of Pennsylvania, B.S. Chemical Engineering
lCarnegie Mellon University, Ph.D. Chemical Engineering
For 2014 compared
Kenneth DiPietro
Experience
Mr. DiPietro has served as our Executive Vice President, Human Resources since January 2012. Mr. DiPietro joined Biogen from Lenovo Group, a technology company, where he served as Senior Vice President, Human Resources from 2005 to 2013June 2011. From 2003 to 2005, he served as Corporate Vice President, Human Resources at Microsoft Corporation, a technology company. From 1999 to 2002, Mr. DiPietro worked as Vice President, Human Resources at Dell Inc., a technology company. Prior to that, he spent 17 years at PepsiCo, a food and beverage company, serving in a range of human resource and general management positions.
Public Company Boards
lBoard of Directors of InVivo Therapeutics Corporation, a medical device company
Education
lCornell University, B.S. in Industrial and Labor Relations
Adriana (Andi) Karaboutis
Experience
Ms. Karaboutis has served as our Executive Vice President, Technology, Business Solutions and Corporate Affairs since December 2015 and prior to that served as our Executive Vice President, Technology and Business Solutions since joining Biogen in September 2014. Prior to that, Ms. Karaboutis was Vice President and Global Chief Information Officer of Dell, Inc., where she was responsible for leading a global IT organization focused on powering Dell as an end-to-end technology solutions provider. Prior to joining Dell in 2010, Ms. Karaboutis spent over 20 years at General Motors and Ford Motor Company in various international leadership positions including computer-integrated manufacturing, supply chain operations, and information technology.
Public Company Boards
lBoard of Directors of Advance Auto Parts, an automotive aftermarket parts provider
Education
lWayne State University, B.S. in Computer Science
Alfred W. Sandrock, Jr., M.D., Ph.D.
Experience
Dr. Sandrock has served as our Chief Medical Officer and Executive Vice President of Neurology Discovery and Development since November 2015. Prior to that, Dr. Sandrock served as our Chief Medical Officer and Group Senior Vice President from May 2013 to October 2015, and as our Chief Medical Officer and Senior Vice President of Development Sciences from February 2012 to April 2013. Prior to that, Dr. Sandrock held several senior executive positions since joining us in 1998, including Senior Vice President of Neurology Research and Development and Vice President of Clinical Development, Neurology.
Public Company Boards
lBoard of Directors of Neurocrine Biosciences, Inc., a life sciences company
Education
lStanford University, B.A. in Human Biology
lHarvard Medical School, M.D.
lHarvard University, Ph.D. in Neurobiology
lMassachusetts General Hospital, internship in Medicine, residency and chief residency in Neurology, and clinical fellowship in Neuromuscular Disease and Clinical Neurophysiology (electromyography)

Available Information
Our principal executive offices are located at 225 Binney Street, Cambridge, MA 02142 and our telephone number is (617) 679-2000. Our website address is www.biogen.com. We make available free of charge through the Investors section of our website our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and all amendments to those reports as soon as reasonably practicable after such material is electronically filed with or furnished to the Securities and Exchange Commission (SEC). We include our website address in this report only as an inactive textual reference and do not intend it to be an active link to our website. The contents of our website are not incorporated into this report.


Item  1A.     Risk Factors
We are substantially dependent on revenues from our principal products.
Our current revenues depend upon continued sales of our principal products, and, unless we develop or acquire rights to new products and technologies, we may be substantially dependent on sales from our principal products for many years. Further, following the completion of the spin-off of our hemophilia business, our revenues will be further reliant and concentrated on sales of our MS products in an increasingly competitive market, and revenue from sales of our product for spinal muscular atrophy. Any of the following negative developments relating to any of our principal products may adversely affect our revenues and results of operations or could cause a decline in our stock price:
safety or efficacy issues;
the introduction or greater acceptance of competing products;
constraints and additional pressures on product pricing or price increases, including those resulting from governmental or regulatory requirements, increased competition, or changes in, or implementation of, reimbursement policies and practices of payors and other third parties; or
adverse legal, administrative, regulatory or legislative developments.
SPINRAZA was recently approved by the FDA, and is in the early stages of commercial launch. In addition to risks associated with new product launches and the other factors described in these “Risk Factors”, our ability to successfully commercialize SPINRAZA may be adversely affected due to:
our limited marketing experience within the spinal muscular atrophy market, which may impact our ability to develop relationships with the associated medical and scientific community;
the lack of readiness of healthcare providers to treat patients with spinal muscular atrophy;
the effectiveness of our commercial strategy for marketing SPINRAZA; and
our ability to maintain a positive reputation among patients, healthcare providers and others in the spinal muscular atrophy community, which may be impacted by pricing and reimbursement decisions relating to SPINRAZA.
If we fail to compete effectively, our business and market position would suffer.
The biopharmaceutical industry and the markets in which we operate are intensely competitive. We compete in the marketing and sale of our products, the development of new products and processes, the acquisition of rights to new products with commercial potential and the hiring and retention of personnel. We compete with biotechnology and pharmaceutical companies that have a greater number of products on the market and in the product pipeline, greater financial and other resources and other technological or competitive advantages. One or more of our competitors may benefit from significantly greater sales and marketing capabilities, may develop products that are accepted more widely than ours or may receive patent protection that dominates, blocks or adversely affects our product development or business.
Our products are also susceptible to competition from generics and biosimilars in many markets. Generic versions of drugs and biosimilars are likely to be sold at substantially lower prices than branded products. Accordingly, the introduction of generic or biosimilar versions of our marketed products likely would significantly reduce both the price that we receive for such marketed products and the volume of products that we sell, which may have an adverse impact on our results of operations.
In the MS market, we face intense competition as the number of products and competitors continues to expand. Due to our significant reliance on sales of our MS products, our business may be harmed if we are unable to successfully compete in the MS market. More specifically, our ability to compete, maintain and grow our share in the MS market may be adversely affected due to a number of factors, including:
the introduction of more efficacious, safer, less expensive or more convenient alternatives to our MS products, including our own products and products of our collaborators;
the introduction of lower-cost biosimilars, follow-on products or generic versions of branded MS products sold by our competitors, and the possibility of future competition from generic versions or prodrugs of existing therapeutics or from off-label use by physicians of therapies indicated for other conditions to treat MS patients;

patient dynamics, including the size of the patient population and our ability to attract new patients to our therapies;
damage to physician and patient confidence in any of our MS products or to our sales and reputation as a result of label changes or adverse experiences or events that may occur with patients treated with our MS products;
inability to obtain appropriate pricing and reimbursement for our MS products compared to our competitors in key international markets; or
our ability to obtain and maintain patent, data or market exclusivity for our MS products.
Sales of our products depend, to a significant extent, on adequate coverage, pricing and reimbursement from third-party payors, which are subject to increasing and intense pressure from political, social, competitive and other sources. Our inability to maintain adequate coverage, or a reduction in pricing or reimbursement, could have an adverse effect on our business, revenues and results of operations and could cause a decline in our stock price.
Sales of our products are dependent, in large part, on the availability and extent of coverage, pricing and reimbursement from government health administration authorities, private health insurers and other organizations. When a new pharmaceutical product is approved, the availability of government and private reimbursement for that product may be uncertain, as is the pricing and amount for which that product will be reimbursed.
Pricing and reimbursement for our products may be adversely affected by a number of factors, including:
changes in, and implementation of, federal, state or foreign government regulations or private third-party payors' reimbursement policies;
pressure by employers on private health insurance plans to reduce costs; and
consolidation and increasing assertiveness of payors, including managed care organizations, health insurers, pharmacy benefit managers, government health administration authorities, private health insurers and other organizations, seeking price discounts or rebates in connection with the placement of our products on their formularies and, in some cases, the imposition of restrictions on access or coverage of particular drugs or pricing determined based on perceived value.
Our ability to set the price for our products can vary significantly from country to country and as a result so can the price of our products. Certain countries set prices by reference to the prices in other countries where our products are marketed. Thus, our inability to secure adequate prices in a particular country may not only limit the revenue from our products within that country, but may also adversely affect our ability to obtain acceptable prices in other markets. This may create the opportunity for third-party cross-border trade or influence our decision to sell or not to sell a product, thus adversely affecting our geographic expansion plans and revenues.
Our failure to maintain adequate coverage, pricing, or reimbursement for our products would have an adverse effect on our business, revenues and results of operations, could curtail or eliminate our ability to adequately fund research and development programs for the discovery and commercialization of new products and could cause a decline in our stock price.
Drug prices are under significant scrutiny in the markets in which our products are prescribed. We expect drug pricing and other health care costs to continue to be subject to intense political and societal pressures on a global basis. As a result, our business and reputation may be harmed, our stock price may be adversely impacted and experience periods of volatility, and our results of operations may be adversely impacted. 

Our results of operations may be adversely affected by current and potential future healthcare reforms.
In the U.S., federal and state legislatures, health agencies and third-party payors continue to focus on containing the cost of health care. Legislative and regulatory proposals and enactments to reform health care insurance programs could significantly influence the manner in which our products are prescribed and purchased. For example, provisions of the PPACA have resulted in changes in the way health care is paid for by both governmental and private insurers, including increased rebates owed by manufacturers under the Medicaid Drug Rebate Program, annual fees and taxes on manufacturers of certain branded prescription drugs, the requirement that manufacturers participate in a discount program for certain outpatient drugs under Medicare Part D and the expansion of the number of hospitals eligible for discounts under Section 340B of the Public Health Service Act. These changes have had and are expected to continue to have a significant impact on our business. In 2017, we may face uncertainties as a result of likely federal and administrative efforts to repeal, substantially modify or invalidate some or all of the provisions of the PPACA. There is no assurance that the PPACA, as currently enacted or as amended in the future, will not adversely affect our business and financial results, and we cannot predict how future federal or state legislative or administrative changes relating to healthcare reform will affect our business.
There is also significant economic pressure on state budgets that may result in states increasingly seeking to achieve budget savings through mechanisms that limit coverage or payment for our drugs. In recent years, some states have considered legislation and ballot initiatives that would control the prices of drugs, including laws to allow importation of pharmaceutical products from lower cost jurisdictions outside the U.S. and laws intended to impose price controls on state drug purchases. State Medicaid programs are increasingly requesting manufacturers to pay supplemental rebates and requiring prior authorization by the state program for use of any drug for which supplemental rebates are not being paid. Government efforts to reduce Medicaid expenses may lead to increased use of managed care organizations by Medicaid programs. This may result in managed care organizations influencing prescription decisions for a larger segment of the population and a corresponding constraint on prices and reimbursement for our products.
In the E.U. and some other international markets, the government provides health care at low cost to consumers and regulates pharmaceutical prices, patient eligibility or reimbursement levels to control costs for the government-sponsored health care system. Many countries have announced or implemented measures to reduce health care costs to constrain their overall level of government expenditures. These measures vary by country and may include, among other things, patient access restrictions, suspensions on price increases, prospective and possibly retroactive price reductions and other recoupments and increased mandatory discounts or rebates, recoveries of past price increases and greater importation of drugs from lower-cost countries to higher-cost countries. These measures have negatively impacted our revenues, and may continue to adversely affect our revenues and results of operations in the future.
Adverse safety events or restrictions on use and safety warnings for our products can negatively affect our business, product sales and stock price.
Adverse safety events involving our marketed products may have a negative impact on our business. Discovery of safety issues with our products could create product liability and could cause additional regulatory scrutiny and requirements for additional labeling or safety monitoring, withdrawal of products from the market and the imposition of fines or criminal penalties. Adverse safety events may also damage physician and patient confidence in our products and our reputation. Any of these could result in liabilities, loss of revenue, material write-offs of inventory, material impairments of intangible assets, goodwill and fixed assets, material restructuring charges and other adverse impacts on our results of operations.
Regulatory authorities are making greater amounts of stand-alone safety information directly available to the public through periodic safety update reports, patient registries and other reporting requirements. The reporting of adverse safety events involving our products or products similar to ours and public rumors about such events may increase claims against us and may also cause our product sales or stock price to decline or experience periods of volatility.
Restrictions on use or significant safety warnings that may be required to be included in the label of our products, such as the risk of developing progressive multifocal leukoencephalopathy (PML), a serious brain infection, in the label for certain of our products, may significantly reduce expected revenues for those products and require significant expense and management time.

If we are unable to obtain and maintain adequate protection for our data, intellectual property and other proprietary rights, our business may be harmed.
Our success depends in part on our ability to obtain and defend patent and other intellectual property rights that are important to the commercialization of our products and product candidates. The degree of patent protection that will be afforded to our products and processes in the U.S. and in other important markets remains uncertain and is dependent upon the scope of protection decided upon by the patent offices, courts, administrative bodies and lawmakers in these countries. We can provide no assurance that we will successfully obtain or preserve patent protection for the technologies incorporated into our products and processes, or that the protection obtained will be of sufficient breadth and degree to protect our commercial interests in all countries where we conduct business. If we cannot prevent others from exploiting our inventions, we will not derive the benefit from them that we currently expect. Furthermore, we can provide no assurance that our products will not infringe patents or other intellectual property rights held by third parties.
We also rely on regulatory exclusivity for protection of our products. Implementation and enforcement of regulatory exclusivity, which may consist of regulatory data protection and market protection, varies widely from country to country. Failure to qualify for regulatory exclusivity, or failure to obtain or maintain the extent or duration of such protections that we expect in each of the markets for our products due to challenges, changes or interpretations in the law or otherwise, could affect our revenue for our products or our decision on whether to market our products in a particular country or countries or could otherwise have an adverse impact on our results of operations.
Litigation, interferences, oppositions, inter partes reviews or other proceedings are, have been and may in the future be necessary in some instances to determine the validity and scope of certain of our proprietary rights, and in other instances to determine the validity, scope or non-infringement of certain patent rights claimed by third parties to be pertinent to the manufacture, use or sale of our products. We may also face challenges to our patent and regulatory protections covering our products by third parties, including manufacturers of generics and biosimilars that may choose to launch or attempt to launch their products before the expiration of our patent or regulatory exclusivity. Litigation, interference, oppositions, inter partes reviews, administrative challenges or other similar types of proceedings are unpredictable and may be protracted, expensive and distracting to management. The outcome of such proceedings could adversely affect the validity and scope of our patent or other proprietary rights, hinder our ability to manufacture and market our products, require us to seek a license for the infringed product or technology or result in the assessment of significant monetary damages against us that may exceed amounts, if any, accrued in our financial statements. An adverse determination in a judicial or administrative proceeding or a failure to obtain necessary licenses could prevent us from manufacturing or selling our products. Furthermore, payments under any licenses that we are able to obtain would reduce our profits derived from the covered products and services.
Our long-term success depends upon the successful development of new products and additional indications for existing products.
Our long-term viability and growth will depend upon successful development of additional indications for our existing products as well as successful development of new products and technologies from our research and development activities, our biosimilars joint venture with Samsung Biologics or licenses or acquisitions from third parties.
Product development is very expensive and involves a high degree of risk. Only a small number of research and development programs result in the commercialization of a product. Clinical trials may indicate that our product candidates lack efficacy, have harmful side effects, result in unexpected adverse events or raise other concerns that may significantly reduce the likelihood of regulatory approval. This may result in terminated programs, significant restrictions on use and safety warnings in an approved label, adverse placement within the treatment paradigm, or significant reduction in the commercial potential of the product candidate.
Clinical trials and the development of biopharmaceutical products is a lengthy and complex process. If we fail to adequately manage our clinical activities, our clinical trials or potential regulatory approvals may be delayed or denied.
Conducting clinical trials is a complex, time-consuming and expensive process. Our ability to complete clinical trials in a timely fashion depends in large part on a number of key factors. These factors include protocol design, regulatory and institutional review board approval, patient enrollment rates and compliance with extensive current Good Clinical Practices. If we or our third-party clinical trial providers or third-party contract research organizations (CROs) do not successfully carry out these clinical activities, our clinical trials or the potential regulatory approval of a product candidate may be delayed or be unsuccessful.

We have opened clinical sites and are enrolling patients in a number of countries where our experience is more limited. In most cases, we use the services of third parties to carry out our clinical trial related activities and rely on such parties to accurately report their results. Our reliance on third parties for these activities may impact our ability to control the timing, conduct, expense and quality of our clinical trials. One CRO has responsibility for a substantial portion of our clinical trial related activities and reporting. If this CRO does not adequately perform, many of our trials may be affected. We may need to replace our CROs. Although we believe there are a number of other CROs we could engage to continue these activities, the replacement of an existing CRO may result in the delay of the affected trials or otherwise adversely affect our efforts to obtain regulatory approvals and commercialize our product candidates.
Successful preclinical work or early stage clinical trials do not ensure success in later stage trials, regulatory approval or commercial viability of a product.
Positive results in a trial may not be replicated in subsequent or confirmatory trials. Additionally, success in preclinical work or early stage clinical trials does not ensure that later stage or larger scale clinical trials will be successful or that regulatory approval will be obtained. In addition, even if later stage clinical trials are successful, regulatory authorities may delay or decline approval of our product candidates. Regulatory authorities may disagree with our view of the data, require additional studies or disagree with our trial design or endpoints. Regulatory authorities may also fail to approve the facilities or the processes used to manufacture a product candidate, our dosing or delivery methods or companion devices. Regulatory authorities may grant marketing approval that is more restricted than anticipated. These restrictions may include limiting indications to narrow patient populations and the imposition of safety monitoring, educational requirements and risk evaluation and mitigation strategies. The occurrence of any of these events could result in significant costs and expenses, have an adverse effect on our business, financial condition and results of operations and cause our stock price to decline or experience periods of volatility.
Even if we are able to successfully develop new products or indications, sales of new products or products with additional indications may not meet investor expectations. We may also make a strategic decision to discontinue development of a product or indication if, for example, we believe commercialization will be difficult relative to the standard of care or other opportunities in our pipeline.
Management and key personnel changes may disrupt our operations, and we may have difficulty retaining key personnel or attracting and retaining qualified replacements on a timely basis for management and other key personnel who may leave the Company.
We have experienced changes in management and other key personnel in critical functions across our organization, including our chief executive officer, and heads of research and development and pharmaceutical operations and technology. Changes in management and other key personnel have the potential to disrupt our business, and any such disruption could adversely affect our operations, programs, growth, financial condition and results of operations. Further, new members of management may have different perspectives on programs and opportunities for our business, which may cause us to focus on new business opportunities or reduce or change emphasis on our existing business programs.
Our success is dependent upon our ability to attract and retain qualified management and key personnel in a highly competitive environment. Qualified individuals are in high demand, and we may incur significant costs to attract them, particularly at the executive level. We may face difficulty in attracting and retaining key talent for a number of reasons, such as management changes, the underperformance or discontinuation of one or more late stage programs or recruitment by competitors. We cannot assure that we will be able to hire or retain the personnel necessary for our operations or that the loss of any such personnel will not have a material impact on our financial condition and results of operations.
Manufacturing issues could substantially increase our costs, limit supply of our products and reduce our revenues.
The process of manufacturing our products is complex, highly regulated and subject to numerous risks, including:
Risk of Product Loss. The manufacturing process for our products is extremely susceptible to product loss due to contamination, oxidation, equipment failure or improper installation or operation of equipment, or vendor or operator error. Even minor deviations from normal manufacturing processes could result in reduced production yields, product defects and other supply disruptions. If microbial, viral or other contaminations are discovered in our products or manufacturing facilities, we may need to close our manufacturing facilities for an extended period of time to investigate and remediate the contaminant.

Risks of Reliance on Third Parties and Single Source Providers. We rely on third-party suppliers and manufacturers for many aspects of our manufacturing process for our products and product candidates. In some cases, due to the unique manner in which our products are manufactured, we rely on single source providers of several raw materials and manufacturing supplies. These third parties are independent entities subject to their own unique operational and financial risks that are outside of our control. These third parties may not perform their obligations in a timely and cost-effective manner or in compliance with applicable regulations, and they may be unable or unwilling to increase production capacity commensurate with demand for our existing or future products. Finding alternative providers could take a significant amount of time and involve significant expense due to the specialized nature of the services and the need to obtain regulatory approval of any significant changes to our suppliers or manufacturing methods. We cannot be certain that we could reach agreement with alternative providers or that the FDA or other regulatory authorities would approve our use of such alternatives.
Global Bulk Supply Risks. We rely on our principal manufacturing facilities for the production of drug substance for our large molecule products and product candidates. Our global bulk supply of these products and product candidates depends on the uninterrupted and efficient operation of these facilities, which could be adversely affected by equipment failures, labor shortages, natural disasters, power failures and numerous other factors.
Risks Relating to Compliance with cGMP. We and our third-party providers are generally required to maintain compliance with cGMP and other stringent requirements and are subject to inspections by the FDA and comparable agencies in other jurisdictions to confirm such compliance. Any delay, interruption or other issues that arise in the manufacture, fill-finish, packaging or storage of our products as a result of a failure of our facilities or the facilities or operations of third parties to pass any regulatory agency inspection could significantly impair our ability to develop and commercialize our products. Significant noncompliance could also result in the imposition of monetary penalties or other civil or criminal sanctions and damage our reputation.
Any adverse developments affecting our manufacturing operations or the operations of our third-party suppliers and manufacturers may result in shipment delays, inventory shortages, lot failures, product withdrawals or recalls or other interruptions in the commercial supply of our products. We may also have to take inventory write-offs and incur other charges and expenses for products that fail to meet specifications, undertake costly remediation efforts or seek more costly manufacturing alternatives. Such developments could increase our manufacturing costs, cause us to lose revenue or market share as patients and physicians turn to competing therapeutics, diminish our profitability or damage our reputation.
We depend on relationships with collaborators and other third-parties for revenue, and the development, regulatory approval, commercialization and marketing of certain products, which are outside of our full control.
We rely on a number of significant collaborative relationships for revenue, and the development, regulatory approval, commercialization and marketing of certain of our products and product candidates. We also outsource to third parties certain aspects of our regulatory affairs and clinical development relating to our products and product candidates. Reliance on collaborative and other third-party relationships subjects us to a number of risks, including:
we may be unable to control the resources our collaborators or third parties devote to our programs or products;
disputes may arise under the agreement, including with respect to the achievement and payment of milestones or ownership of rights to technology developed with our collaborators or other third parties, and the underlying contract with our collaborators or other third parties may fail to provide significant protection or may fail to be effectively enforced if the collaborators or third parties fail to perform;
the interests of our collaborators or third parties may not always be aligned with our interests, such parties may not pursue regulatory approvals or market a product in the same manner or to the same extent that we would, which could adversely affect our revenues;
third-party relationships and collaborations often require the parties to cooperate, and failure to do so effectively could adversely affect product sales, or the clinical development or regulatory approvals of products under joint control or could result in termination of the research, development or commercialization of product candidates or result in litigation or arbitration; and

any failure on the part of our collaborators or other third parties to comply with applicable laws and regulatory requirements in the marketing, sale and maintenance of the marketing authorization of our products or to fulfill any responsibilities our collaborators or other third parties may have to protect and enforce any intellectual property rights underlying our products could have an adverse effect on our revenues as well as involve us in possible legal proceedings.
Given these risks, there is considerable uncertainty regarding the success of our current and future collaborative efforts. If these efforts fail, our product development or commercialization of new products could be delayed or revenues from products could decline.
Our business may be adversely affected if we do not successfully execute our growth initiatives.
We anticipate growth through internal development projects, commercial initiatives and external opportunities, which may include the acquisition, partnering and in-licensing of products, technologies and companies or the entry into strategic alliances and collaborations. While we believe we have a number of promising programs in our pipeline, failure of internal development projects to advance or difficulties in executing on our commercial initiatives could impact our current and future growth, resulting in additional reliance on external development opportunities for growth. The availability of high quality, cost-effective development opportunities is limited and competitive, and we are not certain that we will be able to identify candidates that we and our shareholders consider suitable or complete transactions on terms that are acceptable to us and our shareholders. We may fail to complete transactions for other reasons, including if we are unable to obtain desired financing on favorable terms, if at all. Even if we are able to successfully identify and complete acquisitions and other strategic alliances and collaborations, we may face unanticipated costs or liabilities in connection with the transaction or we may not be able to integrate them or take full advantage of them or otherwise realize the benefits that we expect.
Supporting our growth initiatives and the further development of our existing products and potential new products in our pipeline will require significant capital expenditures and management resources, including investments in research and development, sales and marketing, manufacturing capabilities and other areas of our business. If we do not successfully manage our growth initiatives, then our business and financial results may be adversely affected and we may incur asset impairment or restructuring charges.
We may incur operational difficulties or be exposed to claims and liabilities as a result of the separation and distribution of Bioverativ.
On February 1, 2017, we distributed all of the then outstanding shares of Bioverativ common stock to Biogen stockholders in connection with the separation of our hemophilia business. In connection with the distribution, we entered into a separation and distribution agreement and various other agreements (including a transition services agreement, a tax matters agreement, a manufacturing and supply agreement, an employee matters agreement, an intellectual property matters agreement and certain other commercial agreements). These agreements govern the separation and distribution and the relationship between the two companies going forward, including with respect to potential tax-related losses associated with the separation and distribution. They also provide for the performance of services by each company for the benefit of the other for a period of time (including under the manufacturing and supply agreement pursuant to which we will manufacture and supply certain products and materials to Bioverativ).
There could be significant liability if the separation and distribution is determined to be a taxable transaction. Bioverativ has agreed to indemnify us for certain potential liabilities that may arise, but we cannot guarantee that Bioverativ will be able to satisfy its indemnification obligations.
The separation and distribution agreement provides for indemnification obligations designed to make Bioverativ financially responsible for many liabilities that may exist relating to its business activities, whether incurred prior to or after the distribution, including any pending or future litigation. It is possible that a court would disregard the allocation agreed to between us and Bioverativ and require us to assume responsibility for obligations allocated to Bioverativ. Third parties could also seek to hold us responsible for any of these liabilities or obligations, and the indemnity rights we have under the separation and distribution agreement may not be sufficient to fully cover all of these liabilities and obligations. Even if we are successful in obtaining indemnification, we may have to bear costs temporarily. In addition, our indemnity obligations to Bioverativ may be significant. These risks could negatively affect our business, financial condition or results of operations.

The separation of Bioverativ continues to involve a number of risks, including, among other things, the indemnification risks described above and the potential that management’s and our employees’ attention will be significantly diverted by the provision of transitional services. Certain of the agreements described above provide for the performance of services by each company for the benefit of the other for a period of time. If Bioverativ is unable to satisfy its obligations under these agreements, including its indemnification obligations, we could incur losses. These arrangements could also lead to disputes over rights to certain shared property and over the allocation of costs and revenues for products and operations. Our inability to effectively manage the separation activities and related events could adversely affect our business, financial condition or results of operations.
We may not achieve some or all of the expected benefits of the separation and distribution, and such events may adversely affect our business.
We may not be able to achieve the full strategic and financial benefits expected to result from the separation and distribution, or such benefits may be delayed or not occur at all. If we fail to achieve some or all of the expected benefits of the separation, or if such benefits are delayed, our business, financial condition, results of operations and the value of our stock could be adversely impacted.
A breakdown or breach of our technology systems could subject us to liability or interrupt the operation of our business.
We are increasingly dependent upon technology systems and data. Our computer systems continue to increase in multitude and complexity due to the growth in our business, making them potentially vulnerable to breakdown, malicious intrusion and random attack. Likewise, data privacy or security breaches by individuals authorized to access our technology systems or others may pose a risk that sensitive data, including intellectual property, trade secrets or personal information belonging to us, our patients, customers or other business partners, may be exposed to unauthorized persons or to the public. Cyber-attacks are increasing in their frequency, sophistication and intensity, and are becoming increasingly difficult to detect. They are often carried out by motivated, well-resourced, skilled and persistent actors including nation states, organized crime groups and "hacktivists." Cyber-attacks could include the deployment of harmful malware and key loggers, a denial-of-service attack, a malicious website, the use of social engineering and other means to affect the confidentiality, integrity and availability of our technology systems and data. Our key business partners face similar risks and any security breach of their systems could adversely affect our security posture. While we continue to build and improve our systems and infrastructure and believe we have taken appropriate security measures to reduce these risks to our data and information technology systems, there can be no assurance that our efforts will prevent breakdowns or breaches in our systems that could adversely affect our business and operations and/or result in the loss of critical or sensitive information, which could result in financial, legal, business or reputational harm to us. In addition, our liability insurance may not be sufficient in type or amount to cover us against claims related to security breaches, cyber-attacks and other related breaches.
If we fail to comply with the extensive legal and regulatory requirements affecting the health care industry, we could face increased costs, penalties and a loss of business.
Our activities, and the activities of our collaborators, distributors and other third-party providers, are subject to extensive government regulation and oversight both in the U.S. and in foreign jurisdictions. The FDA and comparable agencies in other jurisdictions directly regulate many of our most critical business activities, including the conduct of preclinical and clinical studies, product manufacturing, advertising and promotion, product distribution, adverse event reporting and product risk management. Our interactions in the U.S. or abroad with physicians and other health care providers that prescribe or purchase our products are also subject to government regulation designed to prevent fraud and abuse in the sale and use of the products and place greater restrictions on the marketing practices of health care companies. Health care companies such as ours are facing heightened scrutiny of their relationships with health care providers from anti-corruption enforcement officials. In addition, health care companies such as ours have been the target of lawsuits and investigations alleging violations of government regulation, including claims asserting submission of incorrect pricing information, impermissible off-label promotion of pharmaceutical products, payments intended to influence the referral of health care business, submission of false claims for government reimbursement, antitrust violations or violations related to environmental matters. There is also enhanced scrutiny of company-sponsored patient assistance programs, including insurance premium and co-pay assistance programs and donations to third party charities that provide such assistance. If we, or our vendors or donation recipients, are deemed to fail to comply with relevant laws, regulations or government guidance in the operation of these programs, we could be subject to significant fines or penalties. Risks relating to compliance with laws and regulations may be heightened as we continue to expand our global operations and enter new therapeutic areas with different patient populations, which may have different product distribution methods, marketing programs or patient assistance programs from those we currently utilize or support.

Regulations governing the health care industry are subject to change, with possibly retroactive effect, including:
new laws, regulations or judicial decisions, or new interpretations of existing laws, regulations or decisions, related to health care availability, pricing or marketing practices, compliance with wage and hour laws and other employment practices, method of delivery, payment for health care products and services, compliance with health information and data privacy and security laws and regulations, tracking and reporting payments and other transfers of value made to physicians and teaching hospitals, extensive anti-bribery and anti-corruption prohibitions, product serialization and labeling requirements and used product take-back requirements;
changes in the FDA and foreign regulatory approval processes that may delay or prevent the approval of new products and result in lost market opportunity;
requirements that provide for increased transparency of clinical trial results and quality data, such as the EMA’s clinical transparency policy, which could impact our ability to protect trade secrets and competitively-sensitive information contained in approval applications or could be misinterpreted leading to reputational damage, misperception or legal action which could harm our business; and
changes in FDA and foreign regulations that may require additional safety monitoring, labeling changes, restrictions on product distribution or use, or other measures after the introduction of our products to market, which could increase our costs of doing business, adversely affect the future permitted uses of approved products, or otherwise adversely affect the market for our products.
Violations of governmental regulation may be punishable by criminal and civil sanctions against us, including fines and civil monetary penalties and exclusion from participation in government programs, including Medicare and Medicaid, as well as against executives overseeing our business. In addition to penalties for violation of laws and regulations, we could be required to repay amounts we received from government payors, or pay additional rebates and interest if we are found to have miscalculated the pricing information we have submitted to the government. We cannot ensure that our compliance controls, policies and procedures will in every instance protect us from acts committed by our employees, collaborators, partners or third-party providers that would violate the laws or regulations of the jurisdictions in which we operate. Whether or not we have complied with the law, an investigation into alleged unlawful conduct could increase our expenses, damage our reputation, divert management time and attention and adversely affect our business.
Our effective tax rate may fluctuate and we may incur obligations in tax jurisdictions in excess of accrued amounts.
As a global biopharmaceutical company, we are subject to taxation in numerous countries, states and other jurisdictions. As a result, our effective tax rate is derived from a combination of applicable tax rates in the various places that we operate. In preparing our financial statements, we estimate the amount of tax that will become payable in each of such places. Our effective tax rate, however, may be different than experienced in the past due to numerous factors, including changes in the mix of our profitability from country to country, the results of examinations and audits of our tax filings, adjustments to the value of our uncertain tax positions, changes in accounting for income taxes and changes in tax laws. Any of these factors could cause us to experience an effective tax rate significantly different from previous periods or our current expectations.
In addition, our inability to secure or sustain acceptable arrangements with tax authorities and future changes in the tax laws, among other things, may result in tax obligations in excess of amounts accrued in our financial statements.
In the U.S., there are several proposals under consideration to reform tax law, including proposals that may reduce or eliminate the deferral of U.S. income tax on our unrepatriated earnings, penalize certain transfer pricing structures, and reduce or eliminate certain foreign or domestic tax credits or deductions. Our future reported financial results may be adversely affected by tax law changes which restrict or eliminate certain foreign tax credits or our ability to deduct expenses attributable to foreign earnings, or otherwise affect the treatment of our unrepatriated earnings.
In addition to U.S. tax reform proposals, the adoption of some or all of the recommendations set forth in the Organization for Economic Co-operation and Development’s project on “Base Erosion and Profit Shifting” (BEPS) by tax authorities in the countries in which we operate, could negatively impact our effective tax rate. These recommendations focus on payments from affiliates in high tax jurisdictions to affiliates in lower tax jurisdictions and the activities that give rise to a taxable presence in a particular country.

Our indebtedness could adversely affect our business and limit our ability to plan for or respond to changes in our business.
Our indebtedness, together with our significant contingent liabilities, including milestone and royalty payment obligations, could have important consequences to our business; for example, such obligations could:
increase our vulnerability to general adverse economic and industry conditions;
limit our ability to access capital markets and incur additional debt in the future;
require us to dedicate a substantial portion of our cash flow from operations to payments on our indebtedness, thereby reducing the availability of our cash flow for other purposes, including business development efforts, research and development and mergers and acquisitions; and
limit our flexibility in planning for, or reacting to, changes in our business and the industry in which we operate, thereby placing us at a competitive disadvantage compared to our competitors that have less debt.
Our sales and operations are subject to the risks of doing business internationally.
We are increasing our presence in international markets, particularly emerging markets, subjecting us to many risks that could adversely affect our business and revenues, such as:
the inability to obtain necessary foreign regulatory or pricing approvals of products in a timely manner;
collectability of accounts receivable;
fluctuations in foreign currency exchange rates, in particular the recent strength of the U.S. dollar versus foreign currencies that has adversely impacted our revenues and net income;
difficulties in staffing and managing international operations;
the imposition of governmental controls;
less favorable intellectual property or other applicable laws;
increasingly complex standards for complying with foreign laws and regulations that may differ substantially from country to country and may conflict with corresponding U.S. laws and regulations;
the far-reaching anti-bribery and anti-corruption legislation in the U.K., including the U.K. Bribery Act 2010, and elsewhere and escalation of investigations and prosecutions pursuant to such laws;
compliance with complex import and export control laws;
restrictions on direct investments by foreign entities and trade restrictions;
greater political or economic instability; and
changes in tax laws and tariffs.
In addition, our international operations are subject to regulation under U.S. law. For example, the Foreign Corrupt Practices Act prohibits U.S. companies and their representatives from offering, promising, authorizing or making payments to foreign officials for the purpose of obtaining or retaining business abroad. In many countries, the health care professionals we regularly interact with may meet the definition of a foreign government official for purposes of the Foreign Corrupt Practices Act. Failure to comply with domestic or foreign laws could result in various adverse consequences, including: possible delay in approval or refusal to approve a product; recalls, seizures or withdrawal of an approved product from the market; disruption in the supply or availability of our products or suspension of export or import privileges; the imposition of civil or criminal sanctions; the prosecution of executives overseeing our international operations; and damage to our reputation. Any significant impairment of our ability to sell products outside of the U.S. could adversely impact our business and financial results.

Our operating results are subject to significant fluctuations.
Our quarterly revenues, expenses and net income (loss) have fluctuated in the past and are likely to fluctuate significantly in the future due to the risks described in these “Risk Factors” as well as the timing of charges and expenses that we may take. We have recorded, or may be required to record, charges that include:
the cost of restructurings;
impairments with respect to investments, fixed assets and long-lived assets, including in-process R&D and other intangible assets;
inventory write-downs for failed quality specifications, charges for excess or obsolete inventory and charges for inventory write downs relating to product suspensions, expirations or recalls;
changes in the fair value of contingent consideration;
bad debt expenses and increased bad debt reserves;
outcomes of litigation and other legal or administrative proceedings, regulatory matters and tax matters;
milestone payments under license and collaboration agreements; and
payments in connection with acquisitions and other business development activities.
Our revenues are also subject to foreign exchange rate fluctuations due to the global nature of our operations. Although we have foreign currency forward contracts to hedge specific forecasted transactions denominated in foreign currencies, our efforts to mitigate the impact of fluctuating currency exchange rates may not be successful. As a result, currency fluctuations among our reporting currency, the U.S. dollar, and the currencies in which we do business will affect our operating results, often in unpredictable ways. Our net income may also fluctuate due to the impact of charges we may be required to take with respect to foreign currency hedge transactions. In particular, we may incur higher than expected charges from hedge ineffectiveness or from the termination of a hedge relationship.
Our operating results during any one period do not necessarily suggest the anticipated results of future periods.
We are pursuing opportunities to expand our manufacturing capacity for future clinical and commercial requirements for product candidates, which will result in the incurrence of significant investment with no assurance that such investment will be recouped.
While we believe we currently have sufficient large scale manufacturing capacity to meet our near-term manufacturing requirements, it is probable that we would need additional large scale manufacturing capacity to support future clinical and commercial manufacturing requirements for product candidates in our pipeline, if such candidates are successful and approved. We are building a large scale biologics manufacturing facility in Solothurn, Switzerland and acquired an additional manufacturing facility in Research Triangle Park, North Carolina. Due to the long lead times necessary for the expansion of manufacturing capacity, we expect to incur significant investment to build or expand our facilities or obtain third-party contract manufacturers with no assurance that such investment will be recouped. If we are unable to adequately and timely manufacture and supply our products and product candidates or if we do not fully utilize our manufacturing facilities, our business may be harmed.
Our investment in Samsung Bioepis, and our success in commercializing biosimilars developed by Samsung Bioepis, are subject to risks and uncertainties inherent in the development, manufacture and commercialization of biosimilars.
Our investment in Samsung Bioepis, and our success in commercializing biosimilars developed by Samsung Bioepis, are subject to a number of risks, including:
Reliance on Third Parties. We are dependent on the efforts of Samsung Bioepis and other third parties over whom we have limited or no control in the development and manufacturing of biosimilars products. If Samsung Bioepis or such other third parties fail to perform successfully, we may not realize the anticipated benefits of our investment in Samsung Bioepis;
Regulatory Compliance. Biosimilar products may face regulatory hurdles or delays due to the evolving and uncertain regulatory and commercial pathway of biosimilars products in certain jurisdictions;

Intellectual Property and Regulatory Challenges. Biosimilar products may face extensive patent clearances, patent infringement litigation, injunctions or regulatory challenges, which could prevent the commercial launch of a product or delay it for many years;
Failure to Gain Market and Patient Acceptance. Market success of biosimilar products will be adversely affected if patients, physicians and payers do not accept biosimilar products as safe and efficacious products offering a more competitive price or other benefit over existing therapies;
Ability to Provide Adequate Supply. Manufacturing biosimilars is complex. If we encounter any manufacturing or supply chain difficulties, we may be unable to meet higher than anticipated demand; and
Competitive Challenges. Biosimilar products face significant competition, including from innovator products and from biosimilar products offered by other companies. In some jurisdictions, local tendering processes may restrict biosimilar products from being marketed and sold in those jurisdictions. The number of competitors in a jurisdiction, the timing of approval and the ability to market biosimilar products successfully in a timely and cost-effective matter are additional factors that may impact our success and/or the success of Samsung Bioepis in this business area.
Our investments in properties may not be fully realized.
We own or lease real estate primarily consisting of buildings that contain research laboratories, office space and manufacturing operations. For strategic or other operational reasons, we may decide to further consolidate or co-locate certain aspects of our business operations or dispose of one or more of our properties, some of which may be located in markets that are experiencing high vacancy rates and decreasing property values. If we determine that the fair value of any of our owned properties is lower than their book value we may not realize the full investment in these properties and incur significant impairment charges or additional depreciation when the expected useful lives of certain assets have been shortened due to the anticipated closing of facilities. If we decide to fully or partially vacate a leased property, such as ceasing manufacturing at our facility in Cambridge, Massachusetts, we may incur significant cost, including facility closing costs, employee separation and retention expenses, lease termination fees, rent expense in excess of sublease income and impairment of leasehold improvements and accelerated depreciation of assets. Any of these events may have an adverse impact on our results of operations.
Our portfolio of marketable securities is subject to market, interest and credit risk that may reduce its value.
We maintain a portfolio of marketable securities for investment of our cash. Changes in the value of our portfolio of marketable securities could adversely affect our earnings. In particular, the value of our investments may decline due to increases in interest rates, downgrades of the bonds and other securities included in our portfolio, instability in the global financial markets that reduces the liquidity of securities included in our portfolio, declines in the value of collateral underlying the securities included in our portfolio and other factors. Each of these events may cause us to record charges to reduce the carrying value of our investment portfolio or sell investments for less than our acquisition cost. Although we attempt to mitigate these risks through diversification of our investments and continuous monitoring of our portfolio's overall risk profile, the value of our investments may nevertheless decline.
There can be no assurance that we will continue to repurchase stock or that we will repurchase stock at favorable prices.
From time to time our Board of Directors authorizes stock repurchase programs, including most recently a $5.0 billion stock repurchase program in July 2016. The amount and timing of stock repurchases are subject to capital availability and our determination that stock repurchases are in the best interest of our stockholders and are in compliance with all respective laws and our agreements applicable to the repurchase of stock. Our ability to repurchase stock will depend upon, among other factors, our cash balances and potential future capital requirements for strategic transactions, results of operations, financial condition and other factors beyond our control that we may deem relevant. A reduction in, or the completion or expiration of, our stock repurchase programs could have a negative effect on our stock price. We can provide no assurance that we will repurchase stock at favorable prices, if at all.

We may not be able to access the capital and credit markets on terms that are favorable to us.
We may seek access to the capital markets to supplement our existing funds and cash generated from operations for working capital, capital expenditure and debt service requirements and other business initiatives. The capital and credit markets have experienced extreme volatility and disruption which leads to uncertainty and liquidity issues for both borrowers and investors. In the event of adverse capital and credit market conditions, we may be unable to obtain capital market financing on favorable terms. Changes in credit ratings issued by nationally recognized credit rating agencies could also adversely affect our cost of financing and the market price of our securities.
Our business involves environmental risks, which include the cost of compliance and the risk of contamination or injury.
Our business and the business of several of our strategic partners involve the controlled use of hazardous materials, chemicals, biologics and radioactive compounds. Although we believe that our safety procedures for handling and disposing of such materials comply with state, federal and foreign standards, there will always be the risk of accidental contamination or injury. If we were to become liable for an accident, or if we were to suffer an extended facility shutdown, we could incur significant costs, damages and penalties that could harm our business. Manufacturing of our products and product candidates also requires permits from government agencies for water supply and wastewater discharge. If we do not obtain appropriate permits, including permits for sufficient quantities of water and wastewater, we could incur significant costs and limits on our manufacturing volumes that could harm our business.
The illegal distribution and sale by third parties of counterfeit versions of our products or stolen products could have a negative impact on our reputation and business.
Third parties might illegally distribute and sell counterfeit or unfit versions of our products, which do not meet our rigorous manufacturing, distribution and testing standards. A patient who receives a counterfeit or unfit drug may be at risk for a number of dangerous health consequences. Our reputation and business could suffer harm as a result of counterfeit or unfit drugs sold under our brand name. Stolen inventory that is not properly stored or sold through unauthorized channels could adversely impact patient safety, our reputation and our business. In addition, inventory that is stolen from warehouses, plants or while in-transit, and that is subsequently improperly stored and sold through unauthorized channels, could adversely impact patient safety, our reputation and our business.
The increasing use of social media platforms presents new risks and challenges.
Social media is increasingly being used to communicate about our products and the diseases our therapies are designed to treat. Social media practices in the biopharmaceutical industry continue to evolve and regulations relating to such use are not always clear. This evolution creates uncertainty and risk of noncompliance with regulations applicable to our business. For example, patients may use social media channels to comment on the effectiveness of a product or to report an alleged adverse event. When such disclosures occur, there is a risk that we fail to monitor and comply with applicable adverse event reporting obligations or we may not be able to defend the company or the public's legitimate interests in the face of the political and market pressures generated by social media due to restrictions on what we may say about our products. There is also a risk of inappropriate disclosure of sensitive information or negative or inaccurate posts or comments about us on any social networking website. If any of these events were to occur or we otherwise fail to comply with applicable regulations, we could incur liability, face overly restrictive regulatory actions or incur other harm to our business.
Some of our collaboration agreements contain change in control provisions that may discourage a third party from attempting to acquire us.
Some of our collaboration agreements include change in control provisions that could reduce the potential acquisition price an acquirer is willing to pay or discourage a takeover attempt that could be viewed as beneficial to shareholders. Upon a change in control, some of these provisions could trigger reduced milestone, profit or royalty payments to us or give our collaboration partner rights to terminate our collaboration agreement, acquire operational control or force the purchase or sale of the programs that are the subject of the collaboration. 
Item  1B.     Unresolved Staff Comments
None.

Item  2.     Properties
Below is a summary of our owned and leased properties as of December 31, 2016.
Massachusetts
In Cambridge, Massachusetts, we own approximately 508,000 square feet of real estate space, consisting of a building that houses a research laboratory and a cogeneration plant totaling approximately 263,000 square feet and a building that contains research, development and quality laboratories which total approximately 245,000 square feet.
In addition, we lease a total of approximately 1,250,000 square feet in Massachusetts, which is summarized as follows:
893,000 square feet in Cambridge, Massachusetts, which is comprised of a 67,000 square foot biologics manufacturing facility, which is subleased by Brammer, and 826,000 square feet for our corporate headquarters, laboratory and additional office space; and
357,000 square feet of office space in Weston, Massachusetts, of which 175,000 square feet has been subleased through the remaining term of our lease agreement.
Our Massachusetts lease agreements expire at various dates through the year 2028.
North Carolina
In RTP, North Carolina, we own approximately 834,000 square feet of real estate space, which is summarized as follows:
357,000 square feet of laboratory and office space;
175,000 square feet related to a large-scale biologics manufacturing facility;
105,000 square feet related to a biologics manufacturing facility;
84,000 square feet of warehouse space and utilities; 
70,000 square feet related to a parenteral fill-finish facility; and
43,000 square feet related to a large-scale purification facility.
In addition, we lease 188,000 square feet of a facility in RTP, North Carolina from Eisai to manufacture our and Eisai's oral solid dose products and 40,000 square feet of warehouse space in Durham, North Carolina.
Denmark
We own a large-scale biologics manufacturing facility totaling approximately 228,000 square feet located in Hillerød, Denmark.
We also own approximately 306,000 square feet of additional space, which is summarized as follows:
139,000 square feet of warehouse, utilities and support space;
70,000 square feet related to a label and packaging facility;
50,000 square feet related to a laboratory facility; and
47,000 square feet of administrative space.
Switzerland
In December 2015 we acquired land in Solothurn, Switzerland where we are building a biologics manufacturing facility in the Commune of Luterbach over the next several years.
Other International
We lease office space in Zug, Switzerland, our international headquarters, the U.K., Germany, France, Denmark and numerous other countries. Our international lease agreements expire at various dates through the year 2028.

Item  3.     Legal Proceedings
For a discussion of legal matters as of December 31, 2016, please read Note 20, Litigation to our consolidated financial statements included in this report, which is incorporated into this item by reference.
Item  4.     Mine Safety Disclosures
Not applicable.

PART II
Item 5.     Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities
Market and Stockholder Information
Our common stock trades on The NASDAQ Global Select Market under the symbol “BIIB.” The following table shows the high and low sales price for our common stock as reported by The NASDAQ Global Select Market for each quarter in the years ended December 31, 2016 and 2015:
 Common Stock Price
 2016 2015
 High Low High Low
First Quarter$301.02
 $242.07
 $480.18
 $334.40
Second Quarter$292.69
 $223.02
 $432.88
 $368.88
Third Quarter$333.65
 $240.07
 $412.24
 $265.00
Fourth Quarter$329.83
 $268.00
 $311.65
 $254.00
As of January 27, 2017, there were approximately 700 stockholders of record of our common stock.
Dividends
We have not paid cash dividends since our inception. While we historically have not paid cash dividends and do not have a current intention to pay cash dividends, we continually review our capital allocation strategies, including, among other things, payment of cash dividends, stock repurchases or acquisitions.
Issuer Purchases of Equity Securities
In July 2016 our Board of Directors authorized a program to repurchase up to $5.0 billion of our common stock (2016 Share Repurchase Program). This authorization does not have an expiration date. Repurchased shares will be retired.
The following table summarizes our common stock repurchase activity under our 2016 Share Repurchase Program during the fourth quarter of 2016:
Period
Total Number of
Shares Purchased
(#)
 
Average Price
Paid per Share
($)
 
Total Number of
Shares Purchased
as Part of Publicly
Announced  Programs
(#)
 
Maximum
Approximate Dollar Value
of Shares That May Yet Be
Purchased Under
Our Programs ($ in millions)
October 20161,254,818
 298.71
 1,254,818
 $4,276.3
November 2016939,046
 294.24
 939,046
 $4,000.0
December 2016
 
 
 $4,000.0
Total2,193,864
 296.80
    
As of December 31, 2016, we repurchased and retired approximately 3.3 million shares of common stock at a cost of $1.0 billion under the 2016 Share Repurchase Program.
In February 2011 our Board of Directors authorized a program to repurchase up to 20.0 million shares of our common stock (2011 Share Repurchase Program), which has been used principally to offset common stock issuances under our share-based compensation plans. The 2011 Share Repurchase Program does not have an expiration date. We did not repurchase any shares of common stock under our 2011 Share Repurchase Program during the year ended December 31, 2016, and have approximately 1.3 million shares remaining available for repurchase under this authorization.


Stock Performance Graph
The graph below compares the five-year cumulative total stockholder return on our common stock, the S&P 500 Index, the Nasdaq Pharmaceutical Index and the Nasdaq Biotechnology Index assuming the investment of $100.00 on December 31, 2011 with dividends being reinvested. The stock price performance in the graph below is not necessarily indicative of future price performance.
 201120122013201420152016
Biogen Inc.100.00
133.00
254.04
308.45
278.37
257.68
NASDAQ Pharmaceutical100.00
114.32
155.11
188.95
199.22
197.05
S&P 500 Index100.00
116.00
153.57
174.60
177.01
198.18
NASDAQ Biotechnology100.00
132.74
220.37
296.19
331.05
260.37

Item 6.     Selected Financial Data
BIOGEN INC. AND SUBSIDIARIES
SELECTED FINANCIAL DATA
Our results of operations are summarized as follows:
 For the Years Ended December 31,
 2016 2015 2014 2013 2012
(In millions, except per share amounts)(d) (e) (d) (f) (g) (h)
Results of Operations         
Product revenues, net (a)
$9,817.9
 $9,188.5
 $8,203.4
 $5,542.3
 $4,166.1
Revenues from anti-CD20 therapeutic programs1,314.5
 1,339.2
 1,195.4
 1,126.0
 1,137.9
Other revenues316.4
 236.1
 304.5
 263.9
 212.5
Total revenues11,448.8
 10,763.8
 9,703.3
 6,932.2
 5,516.5
Total cost and expenses6,298.4
 5,872.8
 5,747.7
 4,441.6
 3,707.4
Gain on sale of rights
 
 16.8
 24.9
 46.8
Income from operations5,150.4
 4,891.0
 3,972.4
 2,515.5
 1,855.9
Other income (expense), net(217.4) (123.7) (25.8) (34.9) (0.7)
Income before income tax expense and equity in loss of investee, net of tax4,933.0
 4,767.3
 3,946.6
 2,480.6
 1,855.1
Income tax expense1,237.3
 1,161.6
 989.9
 601.0
 470.6
Equity in loss of investee, net of tax
 12.5
 15.1
 17.2
 4.5
Net income3,695.7
 3,593.2
 2,941.6
 1,862.3
 1,380.0
Net income (loss) attributable to noncontrolling interests, net of tax(7.1) 46.2
 6.8
 
 
Net income attributable to Biogen Inc.$3,702.8
 $3,547.0
 $2,934.8
 $1,862.3
 $1,380.0
          
Diluted Earnings Per Share         
Diluted earnings per share attributable to Biogen Inc.$16.93
 $15.34
 $12.37
 $7.81
 $5.76
Weighted-average shares used in calculating diluted earnings per share attributable to Biogen Inc.218.8
 231.2
 237.2
 238.3
 239.7
          
Our financial condition is summarized as follows:
 As of December 31,
 2016 2015 2014 2013 2012
(In millions)         
Financial Condition         
Cash, cash equivalents and marketable securities$7,724.5
 $6,188.9
 $3,316.0
 $1,848.5
 $3,742.4
Total assets$22,876.8
 $19,504.8
 $14,314.7
 $11,863.3
 $10,130.1
Notes payable and other financing arrangements, less current portion (b)
$6,512.7
 $6,521.5
 $580.3
 $592.4
 $687.4
Total Biogen Inc. shareholders’ equity (c)
$12,140.1
 $9,372.8
 $10,809.0
 $8,620.2
 $6,961.5
In addition to the following notes, the financial data included within the tables above should be read in conjunction with our consolidated financial statements and related notes and the “Management’s Discussion and Analysis of Financial Condition and Results of Operations” sections of this report and our previously filed Form 10-Ks.
(a)Product revenues, net reflect the increaseimpact of the following product launches:
Commercial sales of SPINRAZA began in the fourth quarter of 2016.

Under the terms of our collaboration agreement with AbbVie, we began to recognize revenues on sales of ZINBRYTA to third parties in the E.U. in the third quarter of 2016.
Under the terms of our commercial agreement with Samsung Bioepis, we began to recognize revenues on sales of BENEPALI and FLIXABI to third parties in the E.U. in the first quarter of 2016 and third quarter of 2016, respectively.
Commercial sales of ALPROLIX commenced in the second quarter of 2014 and commercial sales of ELOCTATE and PLEGRIDY commenced in the third quarter of 2014.
TECFIDERA began in April 2013.
(b)Notes payable and other financing arrangements reflects the issuance of our senior unsecured notes for an aggregate principal amount of $6.0 billion in U.S. product revenues was primarily due to price increasesSeptember 2015, and an increase in unit sales volume, partially offset by the 2013 recognitionrepayment of $94.9our 6.0% notes that were issued in 2008 for an aggregate principal amount of $450.0 million.
(c)Total Biogen Inc.'s shareholders' equity reflects the repurchase of approximately 32.8 million in net revenues resulting from the July 2013 issuance by the Departmentshares of Healthour common stock at a cost of approximately $8.3 billion between 2012 and Human Services of its final rule on the Exclusion of Orphan Drugs for Certain Covered Entities Under 340B Program. The issuance of the final rule by the Department of Health and Human Services did not have an impact on the amount we recorded as revenues from unconsolidated joint business in our consolidated statements of income because, through June 30, 2013, we had been increasing our share of profits in the U.S. to reflect our interpretation of the proposed 340B rule. The final rule was consistent with our prior interpretation. For 2013 compared to 2012, the increase in U.S. product revenues was due to price increases, an increase in unit sales volume and the $94.9 million recognition in net revenues as discussed above.2016:
During 2016 we repurchased and retired approximately 3.3 million shares of our common stock at a cost of $1.0 billion under our 2016 Share Repurchase Program.
During 2015 we repurchased and retired approximately 16.8 million shares of our common stock at a cost of $5.0 billion under our 2015 Share Repurchase Program.
During 2014, 2013 and 2012 we repurchased approximately 2.9 million, 2.0 million and 7.8 million shares, respectively of our common stock at a cost of approximately $2.3 billion under our 2011 Share Repurchase Program of which approximately 3.7 million of these shares were retired.
Collaboration costs
(d)Total cost and expenses for 2014 comparedthe years ended December 31, 2016 and 2015, include restructuring charges of $33.1 million and $93.4 million, respectively. In addition, total cost and expenses for the year ended December 31, 2016, also include charges to 2013 increased primarily due to the recognitioncost of $53.9sales totaling $52.4 million of additional BPD fee expenseexpenses incurred as a result of our determination to vacate and cease manufacturing in our small-scale biologics facility in Cambridge, MA as well as GAZYVA salesvacate our warehouse in Somerville, MA. Total cost and marketingexpenses for year ended December 31, 2016, also include $18.1 million of costs incurred directly related to our separation of our hemophilia business into an independent, publicly traded company.
(e)Total cost and research and development expenses. For additional informationexpenses for the year ended December 31, 2016, includes a pre-tax charge of $454.8 million related to the BPD fee, please read “The Patient ProtectionJanuary 2017 settlement and Affordable Care Act (PPACA)” license agreement with Forward Pharma A/S (Forward Pharma).
(f)In June 2014 AIFA approved a resolution affirming that there is no reimbursement limit from and after February 2013. As a result, we recognized $53.5 million of TYSABRI revenues in this “Management’s Discussion and Analysisthe second quarter of Financial Condition and Results of Operations.” Upon the first marketing approval of GAZYVA by the FDA, we began recognizing all activity, including sales and marketing and research and development expenses2014 related to the GAZYVA program in unconsolidated joint business within our consolidated statements of income. Prior to its first regulatory approval, we recognized ourperiods beginning February 2013 that were previously deferred.
(g)Our share of GAZYVA developmentrevenues from anti-CD20 therapeutic programs reflects charges of $49.7 million in 2013 for damages and commercialization expensesinterest awarded to Hoechst in Genentech's arbitration with Hoechst for RITUXAN.
(h)Commencing in the second quarter of 2013 product and total revenues include 100% of net revenues related to sales of TYSABRI as researcha result of our acquisition of all remaining rights to TYSABRI from Elan Pharma International, Ltd (Elan), an affiliate of Elan Corporation, plc. Upon the closing, our collaboration agreement was terminated, and developmentwe no longer record collaboration profit sharing expense. We recognized collaboration profit sharing expense of $85.4 million and selling, general$317.9 million during the years ended December 31, 2013 and administrative expense, respectively, within our consolidated statements of income.2012, respectively.

Item 7.     Management’s Discussion and Analysis of Financial Condition and Results of Operations
The following discussion should be read in conjunction with our consolidated financial statements and related notes beginning on page F-1 of this report. Certain totals may not sum due to rounding.
Executive Summary
Introduction
Biogen is a global biopharmaceutical company focused on discovering, developing, manufacturing and delivering therapies to people living with serious neurological, rare and autoimmune diseases.
Our marketed products include TECFIDERA, AVONEX, PLEGRIDY, TYSABRI, ZINBRYTA and FAMPYRA for multiple sclerosis (MS), FUMADERM for the treatment of severe plaque psoriasis and SPINRAZA for the treatment of spinal muscular atrophy (SMA). We also have certain business and financial rights with respect to RITUXAN for the treatment of non-Hodgkin's lymphoma, chronic lymphocytic leukemia (CLL) and other conditions, GAZYVA indicated for the treatment of CLL and follicular lymphoma, and other potential anti-CD20 therapies under a collaboration agreement with Genentech, Inc. (Genentech), a wholly-owned member of the Roche Group.
In May 2016 we announced our intention to spin off our hemophilia business, Bioverativ Inc. (Bioverativ), as an independent, publicly traded company. Bioverativ will focus on the discovery, development and commercialization of therapies for the treatment of hemophilia and other blood disorders, including ELOCTATE for the treatment of hemophilia A and ALPROLIX for the treatment of hemophilia B. Bioverativ will also assume all of our rights and obligations under our collaboration agreement with Swedish Orphan Biovitrum AB (Sobi) and our collaboration and license agreement with Sangamo Biosciences Inc. (Sangamo).
On February 1, 2017, we completed the distribution of all the then outstanding shares of common stock of Bioverativ to Biogen stockholders, who received one share of Bioverativ common stock for every two shares of Biogen common stock. As a result of the distribution, Bioverativ is now an independent public company whose shares of common stock are trading under the symbol "BIVV"
on the Nasdaq Global Select Market.
The financial results of Bioverativ are included in our consolidated results of operations and financial position in our audited consolidated financial statements for the periods presented in this Form 10-K. The financial results of Bioverativ will be excluded from our consolidated results of operations and financial position commencing February 1, 2017. For additional information regarding the separation of Bioverativ, please read Note 26, Subsequent Events to our consolidated financial statements included in this report.
Our current revenues depend upon continued sales of our principal products and, unless we develop, acquire rights to, and commercialize new products and technologies, we may be substantially dependent on sales from our principal products for many years. Further, following the completion of the spin-off of our hemophilia business, our revenues will be further reliant and concentrated on sales of our MS products in an increasingly competitive market.
In the longer term, our revenue growth will be dependent upon the successful clinical development, regulatory approval and launch of new commercial products as well as additional indications for our existing products, our ability to obtain and maintain patents and other rights related to our marketed products, assets originating from our research and development efforts and successful execution of external business development opportunities.
We support our drug discovery and development efforts through the commitment of significant resources to discovery, research and development programs and business development opportunities, particularly within areas of our scientific, manufacturing and technical capabilities. For nearly two decades we have led in the research and development of new therapies to treat MS, resulting in our leading portfolio of MS treatments. Now our research is focused on additional improvements in the treatment of MS, such as, the development of next generation therapies for MS with a goal to reverse or possibly repair damage caused by the disease. We are also applying our scientific expertise to solve some of the most challenging and complex diseases, including Alzheimer's disease, Parkinson's disease and amyotrophic lateral sclerosis (ALS), and are employing innovative technologies to discover potential treatments for rare and genetic disorders, including new ways of treating diseases through gene therapy.
Our innovative drug development and commercialization activities are complemented by our biosimilar therapies that expand access to medicines and reduce the cost burden for healthcare systems. We are leveraging our manufacturing capabilities and know-how by developing, manufacturing and marketing


biosimilars through Samsung Bioepis, our joint venture with Samsung BioLogics Co. Ltd. (Samsung Biologics). Under our commercial agreement with Samsung Bioepis, we market and sell BENEPALI, an etanercept biosimilar referencing ENBREL, and FLIXABI, an infliximab biosimilar referencing REMICADE, in the European Union (E.U.).
Financial Highlights
Diluted earnings per share attributable to Biogen Inc. were $16.93 for 2016, representing an increase of 10.4% over the same period in 2015.
As described below under “Results of Operations,” our income from operations for the year ended December 31, 2016, reflects the following:
Total revenues were $11,448.8 million for 2016, representing an increase of 6.4% over the same period in 2015.
Product revenues, net totaled $9,817.9 million for 2016, representing an increase of 6.8% over the same period in 2015. This increase was driven by a 9.1% increase in worldwide TECFIDERA revenues, a 52.8% increase in worldwide hemophilia revenues, a 4.1% increase in worldwide TYSABRI revenues and revenues from BENEPALI. These increases are partially offset by a 5.8% decrease in worldwide Interferon revenues. Product revenues, net for
2016, compared to the same period in 2015, were also negatively impacted by a $167.8 million decrease in hedge gains recognized under our foreign currency hedging program in comparative periods.
Revenues from anti-CD20 therapeutic programs totaled $1,314.5 million for 2016, representing a decrease of 1.8% over the same period in 2015.
Other revenues totaled $316.4 million for 2016, representing an increase of 34.0% from the same period in 2015. This increase was primarily driven by an increase in other corporate revenues, which includes amounts earned with respect to our contract manufacturing activities.
Total cost and expenses totaled $6,298.4 million for 2016, representing an increase of 7.2%, compared to the same period in 2015. This increase was driven by a $454.8 million litigation settlement and license charge and a 19.2% increase in cost of sales, which includes a charge of $45.5 million for accelerated depreciation as a result of the determination to cease manufacturing in Cambridge, MA and vacate our biologics manufacturing facility in Cambridge, MA and warehouse space in Somerville, MA. These increases were partially offset by a 7.8% decrease in selling, general and administrative expenses and a decrease in restructuring charges.
We generated $4,522.4 million of net cash flows from operations for 2016, which were primarily driven by earnings. Cash, cash equivalents and marketable securities totaled approximately $7,724.5 million as of December 31, 2016.
During the year ended December 31, 2016, we repurchased and retired approximately 3.3 million shares of common stock at a cost of $1.0 billion under our share repurchase programs.
Collaborative and Other Relationships
In May 2016 we entered into a collaboration and alliance with the University of Pennsylvania (UPenn) to advance gene therapy and gene editing technologies. For additional information related to this transaction, please read Note 19, Collaborative and Other Relationships to our consolidated financial statements included in this report.


Restructuring and Cost Saving Initiatives
During the third quarter of 2016 we initiated cost saving measures primarily intended to realign our organizational structure due to the changes in roles and workforce resulting from our decision to spin off our hemophilia business, and to achieve further targeted cost reductions.
Additionally, in connection with the transaction to sublease our rights to the manufacturing facility in Cambridge, MA to Brammer Bio MA, LLC (Brammer), certain employees were separated from Biogen.
For additional information related to our restructuring and cost saving initiatives, please read Note 3, Restructuring, Business Transformation and Other Cost Saving Initiatives to our consolidated financial statements included in this report.
Business Environment
The biopharmaceutical industry and the markets in which we operate are intensely competitive. Many of our competitors are working to develop or have commercialized products similar to those we market or are developing. In addition, the commercialization of certain of our own approved MS products, products of our collaborators and pipeline product candidates may negatively impact future sales of our existing MS products. Our products may also face increased competitive pressures from the introduction of generic versions, prodrugs of existing therapeutics or biosimilars of existing products and other technologies, such as gene therapies and bispecific antibodies.
In addition, sales of our products are dependent, in large part, on the availability and extent of coverage, pricing and reimbursement from government health administration authorities, private health insurers and other organizations. Drug prices are under significant scrutiny in the markets in which our products are prescribed. Drug pricing and other health care costs continue to be subject to intense political and societal pressures.
For additional information related to our competition and pricing risks that could negatively impact our product sales, please read the “Risk Factors” section of this report.

Results of Operations
Revenues
Revenues are summarized as follows:
 
For the Years Ended
December 31,
 % Change
 2016 compared to 2015 2015 compared to 2014
(In millions, except percentages)2016 2015 2014 
Product Revenues:         
United States$7,050.4
 $6,545.8
 $5,566.7
 7.7 % 17.6 %
Rest of world2,767.5
 2,642.7
 2,636.7
 4.7 % 0.2 %
Total product revenues9,817.9
 9,188.5
 8,203.4
 6.8 % 12.0 %
Revenues from anti-CD20 therapeutic programs1,314.5
 1,339.2
 1,195.4
 (1.8)% 12.0 %
Other revenues316.4
 236.1
 304.5
 34.0 % (22.5)%
Total revenues$11,448.8
 $10,763.8
 $9,703.3
 6.4 % 10.9 %

Product Revenues
Product revenues are summarized as follows:
 
For the Years Ended
December 31,
 % Change
 2016 compared to 2015 2015 compared to 2014
(In millions, except percentages)2016 2015 2014 
Multiple Sclerosis:         
TECFIDERA$3,968.1
 $3,638.4
 $2,909.2
 9.1 % 25.1 %
Interferon*2,795.2
 2,968.7
 3,057.6
 (5.8)% (2.9)%
TYSABRI1,963.8
 1,886.1
 1,959.5
 4.1 % (3.7)%
FAMPYRA84.9
 89.7
 80.2
 (5.4)% 11.8 %
ZINBRYTA7.8
 
 
 **
 **
Hemophilia:         
ELOCTATE513.2
 319.7
 58.4
 60.5 % 447.4 %
ALPROLIX333.7
 234.5
 76.0
 42.3 % 208.6 %
Other product revenues:         
FUMADERM45.9
 51.4
 62.5
 (10.7)% (17.8)%
SPINRAZA4.6
 
 
 **
 **
BENEPALI100.6
 
 
 **
 **
FLIXABI0.1
 
 
 **
 **
Total product revenues$9,817.9
 $9,188.5
 $8,203.4
 6.8 % 12.0 %
* Interferon includes AVONEX and PLEGRIDY.
** Percentage not meaningful.

Multiple Sclerosis (MS)
TECFIDERA
For 2016 compared to 2015, the increase in U.S. TECFIDERA revenues was primarily due to price increases, partially offset by higher discounts and allowances and a decrease in unit sales volume of 1%.
For 2015 compared to 2014, the increase in U.S. TECFIDERA revenues was primarily due to increases in unit sales volume of 13% as TECFIDERA penetrated the U.S. market, and increases in gross

price partially offset by higher discounts and allowances.
For 2016 compared to 2015, the increase in rest of world TECFIDERA revenues was primarily due to increases in unit sales volume of 32% in existing markets and new markets where we continue to launch the product and expand our presence around the world. These increases were partially offset by pricing reductions in certain European countries. Rest of world TECFIDERA revenues for 2016, compared to 2015, were also negatively impacted by a $50.2 million decrease in hedge gains recognized under our foreign currency hedging program in the comparative period.
For 2015 compared to 2014, the increase in rest of world TECFIDERA revenues was primarily due to increases in unit sales volume in existing markets and in new markets as we continue to launch the product and expand our presence around the world. These increases were partially offset by pricing reductions in Germany as described below. Rest of world TECFIDERA revenues for 2015, compared to 2014, were also negatively impacted by foreign currency exchange losses totaling $74.1 million. These foreign currency exchange losses were partially offset by comparative net gains recognized under our foreign currency hedging program totaling $47.5 million.


Under German legislation related to the pricing of new drug products introduced in the German market, pricing is unregulated for the first 12 months after launch. We launched TECFIDERA in Germany in February 2014 and our unregulated pricing ended in the first quarter of 2015, at which time we began recognizing revenue at the fixed price established through our negotiations with the German regulatory authorities. The negotiated annual price is fixed for three years.
We anticipate relatively stable demand for TECFIDERA in 2017 on a global basis, with patient growth in our international markets offsetting modest patient declines in the U.S. primarily resulting from increasing competition from additional treatments and product candidates for MS, including OCREVUS.
Interferon
AVONEX and PLEGRIDY
For 2016, 2015 and 2014, U.S. AVONEX revenues totaled $1,675.3 million, $1,790.2 million and $1,956.7 million, respectively.
For 2016, 2015 and 2014, U.S. PLEGRIDY revenues totaled $305.0 million, $227.1 million and $27.8 million, respectively.
For 2016 compared to 2015, the decrease in U.S. Interferon revenues was primarily due to an overall decrease in Interferon unit sales volume of 10%, which was attributable to a decrease in AVONEX unit sales volume primarily due to patients transitioning to other oral MS therapies, as well as higher discounts and allowances. These decreases were partially offset by price increases.
For 2015 compared to 2014, the increase in U.S. Interferon revenues was primarily due to gross price increases for AVONEX and an increase in PLEGRIDY unit sales volume as sales of PLEGRIDY began in the U.S. in fourth quarter of 2014. These increases were partially offset by a decrease in AVONEX unit sales volume of 17%, which was attributable in part to patients transitioning to other oral MS therapies, including TECFIDERA.
For 2016, 2015 and 2014 rest of world AVONEX revenues totaled $638.2 million, $840.0 million and $1,056.4 million, respectively.
For 2016, 2015 and 2014, rest of world PLEGRIDY revenues totaled $176.7 million, $111.4 million and $16.7 million, respectively.
For 2016 compared to 2015, the decrease in rest of world Interferon revenues was primarily due to pricing reductions in certain European countries and an overall decrease in AVONEX unit sales volume of 10% due primarily to patients transitioning to other oral MS therapies, including TECFIDERA. Rest of world Interferon revenues for 2016, compared to 2015, were also negatively impacted by a $66.1 million decrease in hedge gains recognized under our hedging program in the comparative period.
For 2015 compared to 2014, the decrease in rest of world Interferon revenues was due to a decrease in AVONEX unit sales volume of 11% primarily in Europe attributable to patients transitioning to other oral MS therapies, including TECFIDERA. These increases were partially offset by an increase in PLEGRIDY unit sales volume as sales of PLEGRIDY began in the E.U. in the third quarter of 2014. Rest of world Interferon revenues for 2015, compared to 2014, were also negatively impacted by foreign currency exchange losses of $153.1 million. These foreign currency exchange losses were partially offset by comparative net gains recognized under our foreign currency hedging program of $58.4 million.
We expect that overall Interferon revenues will continue to decline as a result of competition from our other products as well as other MS therapies.


TYSABRI
For 2016 compared to 2015, the increase in U.S. TYSABRI revenues was primarily due to an increase in unit sales volume of 4% and increases in price, partially offset by higher discounts and allowances.
For 2015 compared to 2014, the increase in U.S. TYSABRI revenues was primarily due to an increase in unit sales volume of 4% and increases in gross price, partially offset by higher discounts and allowances.
For 2016 compared to 2015, the slight decrease in rest of world TYSABRI revenues was primarily due to the impact of a $46.1 million decrease in hedge gains recognized under our hedging program in the comparative period. This decrease was partially offset by an increase in unit sales volume of 8%, primarily in Europe.
For 2015 compared to 2014, the decrease in rest of world TYSABRI revenues was due to pricing reductions in some European countries and the prior year recognition of $53.5 million of revenue previously deferred in Italy relating to the pricing agreement with the Italian National Medicines Agency (Agenzia Italiana del Farmaco or AIFA) as discussed below.
Rest of world TYSABRI revenues for 2015, compared to 2014, were negatively impacted by foreign currency exchange losses of $136.3 million. These foreign currency exchange losses were partially offset by comparative net gains recognized under our foreign currency hedging program of $45.9 million.
In the fourth quarter of 2011 Biogen Italia SRL, our Italian subsidiary, received a notice from AIFA that sales of TYSABRI after mid-February 2009 exceeded a reimbursement limit established pursuant to a Price Determination Resolution (Price Resolution) granted by AIFA in December 2006. In January 2017, we negotiated an agreement in principle with AIFA's Price and Reimbursement Committee to settle all of AIFA's existing claims relating to sales of TYSABRI in excess of the reimbursement limit for the periods from February 2009 through January 2013 for an aggregate repayment of EUR37.4 million. The agreement is subject to ratification by AIFA. If this most recent settlement agreement is accepted, we could recognize approximately EUR42 million in revenue upon resolution of this matter. For information regarding our agreement with AIFA relating to sales of TYSABRI in Italy, please read Note 17, Other Consolidated Financial Statement Detail to our consolidated financial statements included in this report.
We anticipate relatively stable demand for TYSABRI in 2017 on a global basis, with patient growth in our international markets offsetting modest patient declines in the U.S. primarily resulting from increasing competition from additional treatments and product candidates for MS, including ZINBRYTA and OCREVUS.
ZINBRYTA
Under the terms of our collaboration agreement with AbbVie, we began to recognize revenues on sales of ZINBRYTA to third parties in the E.U. in the third quarter of 2016.
For additional information on our relationship with AbbVie, please read Note 19, Collaborative and Other Relationships to our consolidated financial statements included in this report.


Hemophilia
ELOCTATE
For 2016 compared to 2015, the increase in U.S. ELOCTATE revenues was primarily due to an increase in unit sales volume of 45%.
For 2015 compared to 2014, the increase in U.S. ELOCTATE revenues was primarily due to increases in unit sales volume. Sales of ELOCTATE in the U.S. began in the third quarter of 2014.
For 2016 compared to 2015, the increase in rest of world ELOCTATE revenues was primarily due to an increase in unit sales volume, primarily in Japan.
For 2015 compared to 2014, the increase in rest of world ELOCTATE revenues was primarily due to increases in unit sales volume. Sales of ELOCTATE in Japan began in the first quarter of 2015.
ALPROLIX
For 2016 compared to 2015, the increase in U.S. ALPROLIX revenues was primarily due to an increase in unit sales volume of 28%.
For 2015 compared to 2014, the increase in U.S. ALPROLIX revenues was primarily due to increases in unit sales volume. Sales of ALPROLIX in the U.S. began in the second quarter of 2014.
For 2016 compared to 2015, the increase in rest of world ALPROLIX revenues was primarily due to an increase in unit sales volume, primarily in Japan.
For 2015 compared to 2014, the increase in rest of world ALPROLIX revenues was primarily due to increases in unit sales volume. Sales of ALPROLIX in Japan began in the fourth quarter of 2014.
On February 1, 2017, we completed the distribution of the then outstanding shares of common stock of Bioverativ to Biogen stockholders. As a result of the distribution, Bioverativ will assume discovery, development and commercialization of ELOCTATE and ALPROLIX in the U.S.
For additional information on the transaction to separate from and spin off our hemophilia business as a separate independent public company, please read Note 26, Subsequent Events to our consolidated financial statements included in this report.


Biosimilars
Under the terms of our commercial agreement with Samsung Bioepis, we began to recognize revenues on sales of BENEPALI and FLIXABI to third parties in the E.U. in the first quarter of 2016 and third quarter of 2016, respectively.
For additional information on our relationship with Samsung Bioepis, please read Note 19, Collaborative and Other Relationships to our consolidated financial statements included in this report.
Revenues from Anti-CD20 Therapeutic Programs
Genentech (Roche Group)
Our share of RITUXAN and GAZYVA operating profits are summarized as follows:
Biogen’s Share of Pre-tax Profits in the U.S. for RITUXAN and GAZYVA
The following table provides a summary of amounts comprising our share of pre-tax profits on RITUXAN and GAZYVA in the U.S.:
 
For the Years Ended
December 31,
 
(In millions)2016 2015 2014
Product revenues, net$3,941.8
 $3,847.9
 $3,556.6
Cost and expenses744.5
 673.7
 771.1
Pre-tax profits in the U.S.$3,197.3
 $3,174.2
 $2,785.5
Biogen's share of pre-tax profits$1,249.5
 $1,269.8
 $1,117.1
Our share of RITUXAN pre-tax profits in the U.S. decreased to 39% from 40% as GAZYVA was approved by the FDA in follicular lymphoma in February 2016.
For 2016 compared to 2015, the increase in U.S. product revenues was primarily due to an increase in GAZYVA unit sales volume of 41%, an increase in RITUXAN unit sales of 1% and selling price increases, partially offset by higher RITUXAN discounts and allowances.
For 2015 compared to 2014, the increase in U.S. product revenues was primarily due to a 4% increase in RITUXAN unit sales volume and selling price increases, partially offset by higher discounts and allowances.
Collaboration costs and expenses for 2016 compared to 2015 increased primarily due to an increase in RITUXAN product cost of sales.
Collaboration costs and expenses for 2015 compared to 2014 decreased primarily due to the 2014 recognition of $53.9 million of additional Branded Pharmaceutical Drug (BPD) fee expense as well as lower RITUXAN cost of sales, partially offset by higher GAZYVA sales and marketing expenses. During 2014 the Internal Revenue Service issued final regulations related to the BPD fee, which had the effect of changing the recognition of the fee for accounting purposes, from the period in which the fee was paid, to the period when the sale occurs. As a result of these final regulations, we recognized an incremental BPD fee in 2014 for the periods 2013 through the end of the third quarter of 2014. The final regulations did not change the timing of payments.


For additional information related to our collaboration with Genentech, including information regarding the pre-tax profit sharing formula and its impact on future revenues from anti-CD20 therapeutic programs, please read Note 19, Collaborative and Other Relationships to our consolidated financial statements included in this report.
Collaboration costs and expenses for 2013 compared to 2012 increased primarily due to a higher cost of goods sold resulting from an increased volume in RITUXAN sales, higher associated third party royalties and GAZYVA sales and marketing and research and development expenses. 
Revenue on Sales in the Rest of World for RITUXAN
Revenue on sales in the rest of world for RITUXAN primarily consists of our share of pre-tax co-promotion profits on RITUXAN in Canada and royalty revenue on sales outside the U.S. and Canada.
For 20142016 compared to 2013, revenue on sales in the rest of world for RITUXAN increased primarily due to the prior year recognition of a $41.2 million charge for damages2015, and interest awarded to Hoechst in its arbitration with Genentech. For 20132015 compared to 20122014, revenue on sales in the rest of world for RITUXAN decreased as a result of a $41.2 million charge for damages and interest awarded to Hoechst, as discussed above, as well as the expirations of royalties on a country-by-country basis.
The royalty period for sales in the rest of world is 11 years from the first commercial sale of such product on a country-by-country basis. The royalty periods for the substantial portion of the royalty-bearing sales in the rest of world markets expired during 2012 and 2013. We expect future revenue on sales of RITUXAN in the rest of world will be limited to our share oflower pre-tax co-promotion profits on RITUXAN in Canada.

Other Revenues
Other revenues are summarized as follows:
For the Years Ended
December 31,
 % Change
For The Years
Ended December 31,
 % Change
2014 compared to 2013 2013 compared to 2012 2016 compared to 2015 2015 compared to 2014
(In millions, except percentages)2014 2013 2012 2016 2015 2014 
Royalty revenues$176.7
 $185.7
 $168.7
 (4.8)% 10.1%
Corporate partner revenues127.8
 78.2
 43.8
 63.4 % 78.5%
Revenues from collaborative and other relationships$39.3
 $69.1
 $58.5
 (43.1)% 18.1 %
Other royalty and corporate revenues277.1
 167.0
 246.0
 65.9 % (32.1)%
Total other revenues$304.5
 $263.9
 $212.5
 15.4 % 24.2%$316.4
 $236.1
 $304.5
 34.0 % (22.5)%
Revenues from Collaborative and Other Relationships
Revenues from collaborative and other relationships include revenues earned under our manufacturing services agreement with Sobi on shipments of ELOCTA and ALPROLIX to Sobi, royalties from Sobi on sales of ELOCTA and ALPROLIX in their territory, which includes substantially all of Europe, Russia and certain markets in Northern Africa and the Middle East (the Sobi Territory), our 50% share of the co-promotion profits or losses of ZINBRYTA in the U.S. with AbbVie and revenues from our technical development and manufacturing services agreements with Samsung Bioepis.
For 2016 compared to 2015, the decrease in revenues from collaborative and other relationships is primarily due to a net overall loss in the collaboration with AbbVie of $21.9 million within the U.S. territory and lower revenues earned under our manufacturing services agreement with Samsung Bioepis, partially offset by an increase in ELOCTA shipments made under our manufacturing services agreement with Sobi.
For 2015 compared to 2014, the increase in revenues from collaborative and other relationships was primarily due to the start of product shipments to Sobi in relation to our collaboration agreement, as well as increased revenues earned under our manufacturing services agreement with Samsung Bioepis.
For additional information on our collaborative and other relationships, please read Note 19, Collaborative and Other Relationships to our consolidated financial statements included in this report.
Other Royalty and Corporate Revenues


Royalty Revenues
We receive royalties from net sales on products related to patents that we licensed. Ourhave out-licensed. Prior to 2015, our most significant source of royalty revenue hashad been derived from net worldwide sales of ANGIOMAX, which is licensedwas out-licensed to The Medicines Company (TMC). In March 2012, the U.S. Patent and Trademark Office granted the extension of the term of the principal U.S. patent that covers ANGIOMAX toCompany. On December 15, 2014.
Royalty2014 we ceased recognizing royalty revenues from the net worldwideU.S. sales of ANGIOMAX, are recognized in an amount equal tocontemporaneous with the level of net sales achieved during a calendar year multiplied by the royalty rate in effect for that tier under our agreement with TMC. The royalty rate increases based upon which tier of total net sales are earned in any calendar year. During 2012, we amended our agreement with TMC for the period from January 1, 2013 to December 15, 2014 to modestly increase the royalty rate in effect for all tiers.U.S. patent's expiration.

42


For 20142016 compared to 2013,2015, royalty revenues were relatively consistent.
For 2015 compared to 2014, royalty revenues decreased primarily due to a decrease in the net worldwide salesexpiration of ANGIOMAX subjectU.S. patent rights that gave rise to royalty payments. For 2013 compared to 2012 the increase in royalty revenues was primarilypayments related to the increase in the royalty rate as well as an increase in the net worldwide sales of ANGIOMAX.
Our royalty revenues from ANGIOMAX ceased as of December 15, 2014 upon patent expiry. We also expect declines in royalty revenues from our out-licensed patents over the next several years due to changes in the competitive landscape related to one of the underlying technologies we licensed. These changes resulted in an asset impairment charge of $34.7 million recorded in the first quarter of 2014 which has been reflected in amortization of acquired intangible assets within our consolidated statement of income. As a result, we estimate that in 2015 we will have a decrease of approximately $130 million in royalty revenues.
Other Corporate Partner Revenues
Our corporate partner revenues include amounts earned under contract manufacturing agreements, which includes revenues related to our arrangement with Samsung Bioepis, and revenues covering products previously included within our product line that we have sold or exclusively licensed to third parties.agreements.
For 20142016 compared to 2013,2015, as well as 2015 compared to 2014, to the increase in other corporate partner revenuerevenues was primarily due to higher contract manufacturing revenue and increased revenue from our biosimilar arrangements, partially offset by lower revenue associated with our Zevalin supply agreement. For 2013 comparedrevenues related to 2012, the increase in corporate partner revenues was primarily duedrug substance manufacturing provided to increased revenue from our biosimilar arrangements and an amendment to our Zevalin supply agreement, which resulted in the delivery of our remaining Zevalin inventory and the recognition of a previously deferred amount. Zevalin is a program we sold in 2007 but have continued to manufacture in accordance with the amendment to our Zevalin supply agreement. As part of the amendment, we committed to one additional Zevalin manufacturing campaign, which was completed in the third quarter of 2014.strategic partner.
For additional information on our relationship with Samsung Bioepis, please read Note 20, Collaborative and Other Relationships to our consolidated financial statements included within this report.
Reserves for Discounts and Allowances
Revenues from product sales are recorded net of reserves established for applicable allowances for trade term discounts wholesaler incentives, Medicaid rebates, Veterans Administration (VA) and Public Health Service (PHS) discounts, specialty pharmacy program fees, managed care rebates, product returns, and other governmental rebates or applicable allowances, including those associated with the implementation of pricing actions in certain international markets where we operate.
Reserves established for these discountsThese reserves are based on estimates of the amounts earned or to be claimed on the related sales and allowances are classified as reductions of accounts receivable (if the amount is payable to our customer) or a liability (if the amount is payable to a party other than our customer). These reserves are based on estimates of the amounts earned or to be claimed on the related sales. Our estimates take into consideration our historical experience, current contractual and statutory requirements, specific known market events and trends, industry data and forecasted customer buying and payment patterns. Actual amounts may ultimately differ from our estimates. If actual results vary, we adjust these estimates, which will have an effect on earnings in the period of adjustment. To date, such adjustments have not been significant.
Reserves for discounts, contractual adjustments and returns that reduced gross product revenues are summarized as follows:
 
For the Years Ended
December 31,
 % Change
 2014 compared to 2013 2013 compared to 2012
(In millions, except percentages)2014 2013 2012 
Discounts$346.3
 $235.6
 $96.2
 47.0% 144.9%
Contractual adjustments1,231.6
 835.0
 529.5
 47.5% 57.7%
Returns52.6
 24.0
 21.9
 119.2% 9.6%
Total allowances$1,630.5
 $1,094.6
 $647.6
 49.0% 69.0%
Gross product revenues$9,833.9
 $6,636.9
 $4,813.7
 48.2% 37.9%
Percent of gross product revenues16.6% 16.5% 13.5%    

43


As a result of our acquisition of all remaining rights to TYSABRI from Elan, we began recognizingFor the years ended December 31, 2016, 2015 and 2014, reserves for discounts and allowances for U.S. TYSABRI revenue in the second quarteras a percentage of 2013. Prior periods included reserves for discounts and allowances for rest of world TYSABRI revenue and worldwide AVONEX revenue. In addition, following our commercial product launches, we began recognizing reserves for discounts and allowances related to these products' revenue. Grossgross product revenues for the first quarter of 2013were 21.3%, 19.3% and for 2012 include sales of TYSABRI to Elan under our collaboration agreement, which did not have any corresponding reserves for discounts and allowances.16.6%, respectively.
Discounts
Discounts include trade term discounts and wholesaler incentives.
For 20142016 compared to 2013,2015, the increase in discounts was primarily driven by increases in gross selling price, contractual discount rates and volume related to our hemophilia products.
For 2015 compared to 2014, the increase in discounts was primarily driven by our recent product additions. For 2013 compared to 2012, the increaseadditions, gross price increases and increases in discounts was primarily driven by the additions of TECFIDERA and U.S. TYSABRI amounts.contractual rates
Contractual Adjustments
Contractual adjustments relate to Medicaid and managed care rebates, VA, PHSco-payment assistance (copay), Veterans Administration (VA), Public Health Service (PHS) discounts, specialty pharmacy program fees and other government rebates or applicable allowances. In addition to the above noted product additions, for 2014
For 2016 compared to 2013,2015, the increase in contractual adjustments was primarily due to an increase in managed care rebates, U.S.higher Medicaid and other governmental rebates and allowances as a result of price increasesin the U.S. and additional managed care contracts. rebates, due in part to an increase in gross selling prices.


For 20132015 compared to 2012,2014, the increase in contractual adjustments was primarily due to theour recent product additions, of TECFIDERAhigher Medicaid and U.S. TYSABRI amounts and an increase in U.S.other governmental rebates and allowances in the U.S. and managed care rebates as a result of price increases.an increase in contracted business and gross prices.
Returns
Product return reserves are established for returns made by wholesalers. In accordance with contractual terms, wholesalers are permitted to return product for reasons such as damaged or expired product. The majority of wholesaler returns are due to
product expiration. ReservesProvisions for product returns are recorded in the period the related revenue is recognized, resulting in a reduction to product sales.
For 20142016 compared to 2013,2015, and 2015 compared to 2014, return reserves increaseddecreased primarily due to our acquisition of all remaining rights to TYSABRI, the start of commercial sales of TECFIDERA and increaseda reduction in return rates for prior year AVONEX shipments. For 2013 compared to 2012, return reserves increased primarily due to our acquisitionbased on recent experiences of all remaining rights to TYSABRI and the FDA approval and start of commercial sales of TECFIDERA.returned products.
For additional information related to our reserves, please read Note 5,4, Reserves for Discounts and Allowances to our consolidated financial statements included withinin this report.

Cost and Expenses
A summary of total cost and expenses is as follows:
For the Years Ended
December 31,
 % Change
For the Years Ended
December 31,
 % Change
2014 compared to 2013 2013 compared to 20122016 compared to 2015 2015 compared to 2014
(In millions, except percentages)2014 2013 2012 2016 2015 2014 
Cost of sales, excluding amortization of acquired intangible assets$1,171.0
 $857.7
 $545.5
 36.5 % 57.2 %$1,478.7
 $1,240.4
 $1,171.0
 19.2 % 5.9 %
Research and development1,893.4
 1,444.1
 1,334.9
 31.1 % 8.2 %1,973.3
 2,012.8
 1,893.4
 (2.0)% 6.3 %
Selling, general and administrative2,232.3
 1,712.1
 1,277.5
 30.4 % 34.0 %1,947.9
 2,113.1
 2,232.3
 (7.8)% (5.3)%
Amortization of acquired intangible assets489.8
 342.9
 202.2
 42.8 % 69.6 %385.6
 382.6
 489.8
 0.8 % (21.9)%
Restructuring charges33.1
 93.4
 
 (64.6)% **
(Gain) loss on fair value remeasurement of contingent consideration14.8
 30.5
 (38.9) (51.5)% (178.4)%
Collaboration profit sharing
 85.4
 317.9
 (100.0)% (73.1)%10.2
 
 
 **
 **
(Gain) loss on fair value remeasurement of contingent consideration(38.9) (0.5) 27.2
 **
 (102.0)%
Restructuring charges
 
 2.2
 **
 (100.0)%
TECFIDERA litigation settlement and license charges454.8
 
 
 **
 **
Total cost and expenses$5,747.7
 $4,441.6
 $3,707.4
 29.4 % 19.8 %$6,298.4
 $5,872.8
 $5,747.7
 7.2 % 2.2 %
** Percentage not meaningful.

44


Cost of Sales, Excluding Amortization of Acquired Intangible Assets (Cost of Sales)
 
For the Years Ended
December 31,
 % Change
 2014 compared to 2013 2013 compared to 2012
(In millions, except percentages)2014 2013 2012 
Product cost of sales$585.7
 $427.6
 $365.9
 37.0% 16.9%
Royalty cost of sales585.3
 430.1
 179.6
 36.1% 139.5%
Total cost of sales$1,171.0
 $857.7
 $545.5
 36.5% 57.2%
Product Cost of Sales
For 20142016 compared to 2013,2015, the increase in product cost of sales was primarily driven by increased contract manufacturing shipments and higher unit sales volume including recent product launchesrelated to our biosimilars and hemophilia products, partially offset by favorable production costs and mix of products.
Product cost of sales for 2016 also reflects the recognition of $45.5 million of accelerated depreciation as a result of the determination to cease manufacturing in Cambridge, MA and vacate our contractbiologics manufacturing facility in Cambridge, MA and biosimilars manufacturing arrangements. warehouse space in Somerville, MA.
For 20132015 compared to 2012,2014, the increase in product cost of sales was primarily driven by increased contract manufacturing production and higher unit sales volume our product launch of TECFIDERA in the U.S. and our biosimilars manufacturing arrangement with Samsung Bioepis. In addition, for 2013 compared to 2012, the increase in product cost of sales was driven by an increase in charges related to excess, obsolete, unmarketable or other inventory due in part to the implementation of our plans to supply rest of world markets with TYSABRI manufactured at our Hillerød, Denmark facility, which was approved by the FDA and EMA in July 2013. marketed products, including newly launched products.
Our products are subject to strict quality control and monitoring which we perform throughout the manufacturing process. Periodically, certain batches or units of product may no longer meet quality specifications or may expire. The expiry associated with our inventory is generally between 6 months and 5 years, depending on the product.
Inventory amounts written down related toas a result of excess, obsolete, unmarketable,obsolescence, unmarketability or other inventoryreasons totaled $50.6$48.2 million,, $47.3 $41.9 million, and $24.8$50.6 million for the years ended December 31, 2014, 2013,2016, 2015 and 2012,2014, respectively.
Royalty Cost of Sales
For 20142016 compared to 2013 as well as for 2013 compared to 2012,2015, the increase in royalty cost of sales was primarily driven by the increase in royalty rates payable to Sobi, increased sales of our acquisitionhemophilia products and higher royalties on sales of all remaining rightsAVONEX and PLEGRIDY in the U.S., partially offset by a decrease in TYSABRI royalties due to the expiration of certain third party royalties.
On June 28, 2016, the U.S. Patent and Trademark Office issued to the Japanese Foundation for Cancer Research (JFCR) a patent related to recombinant interferon-beta protein. This patent, U.S. Patent No. 9,376,478, expires in June 2033. This patent was issued following an interference proceeding between JFCR and us. This patent is relevant to AVONEX and PLEGRIDY, and we will pay royalties in the mid-single digits in relation to this patent during the life of the patent.
For 2015 compared to 2014, the increase in royalty cost of sales was primarily driven by the increase in royalties due to Sobi on increased sales of our hemophilia products and an increase in the contractual rate of TYSABRI contingent payments due to Perrigo Company plc (Perrigo), which is based on the expected level of annual worldwide net sales of TYSABRI, partially offset by a decrease in TYSABRI revenues and the expiration of a third party royaltycertain third-party royalties related to AVONEX. As a result ofTYSABRI.
For additional information on our acquisition of all remaining rightsrelationship with Sobi, please read Note 19, Collaborative and Other Relationships to TYSABRI from Elan, our contingent payments due to Elan are recorded as a component of royalty cost of sales.consolidated financial statements included in this report.


Research and Development
 
For the Years Ended
December 31,
 % Change
 2014 compared to 2013 2013 compared to 2012
(In millions, except percentages)2014 2013 2012 
Marketed products$371.0
 $252.1
 $128.2
 47.2 % 96.6 %
Late stage programs109.5
 272.8
 467.0
 (59.9)% (41.6)%
Early stage programs246.5
 130.8
 90.7
 88.5 % 44.2 %
Research and discovery162.8
 97.6
 94.6
 66.8 % 3.2 %
Other research and development costs755.9
 552.7
 479.0
 36.8 % 15.4 %
Milestone and upfront payments247.7
 138.1
 75.4
 79.4 % 83.2 %
Total research and development$1,893.4
 $1,444.1
 $1,334.9
 31.1 % 8.2 %


Research and development expense incurred in support of our marketed products includes costs associated with product lifecycle management activities including, if applicable, costs associated with the development of new indications for existing products. Late stage programs are programs in Phase 3 development or in registration stage. Early stage programs are programs in Phase 1 or Phase 2 development. Research and discovery represents costs incurred to support our discovery research and translational science efforts. Other research and development costs consist of indirect costs incurred in support of overall research and development activities and non-specific programs, including activities that benefit multiple programs, such as management costs as well as depreciation and other facility-based expenses. Costs are reflected in the development stage based upon the program status when incurred. Therefore, the same program could be reflected in different development stages in the same year. For several of our programs, the research and development activities are part of our collaborative and other relationships. Our costs reflect our share of the total costs incurred.

45


For 20142016 compared to 2013,2015, the decrease in research and development expense was primarily related to decreases in costs incurred in connection with our early stage programs, marketed products and other research and development costs. These decreases were partially offset by increased costs incurred in connection with our late stage programs and research and discovery.
The decrease in spending associated with our early stage programs for 2016 compared to 2015 was primarily due to the advancement of our aducanumab program for Alzheimer's disease to a late stage program in the third quarter of 2015, decreased costs incurred in connection with opicinumab in MS and the discontinuance of development of anti-TWEAK in lupus nephritis. These decreases were partially offset by increased costs of BIIB074 (formerly known as Raxatrigine) in trigeminal neuralgia (TGN) and increased costs associated with our discontinuance of development of amiselimod in the third quarter of 2016.
The decrease in spending associated with our marketed products for 2016 compared to 2015 was primarily due to the discontinuance of development of TYSABRI and TECFIDERA in secondary primary multiple sclerosis (SPMS) in the third and fourth quarters of 2015, respectively, and decreased costs incurred in connection with our hemophilia products. These decreases were partially offset by the approvals of ZINBRYTA and SPINRAZA in the third and fourth quarters of 2016, respectively.
The increase in spending associated with our late stage programs for 2016 compared to 2015 was primarily driven by costs incurred to advance our aducanumab program for Alzheimer's disease, the increased costs incurred to advance our SPINRAZA program for the treatment of SMA and the advancement of E2609 to a late stage program in the fourth quarter of 2016, partially offset by the approval of ZINBRYTA in the third quarter of 2016.
For 2015 compared to 2014, the increase in research and development expense was primarily related to increaseincreases in costs incurred in connection with our late and early stage programs upfront and milestone expenses, research and discovery, marketed productspartially offset by a decrease in milestone and other researchupfront expenses and development cost,the positive impact of foreign currency translation of $34.0 million.
The increase in spending associated with our late stage programs for 2015 compared to 2014 was primarily driven by costs incurred to advance our aducanumab program for Alzheimer's disease and the SPINRAZA program for the treatment of SMA, partially offset by a decrease in costs related to ZINBRYTA and the approvals of PLEGRIDY and ELOCTATE in 2014.
The increase in spending associated with our early stage programs for 2015 compared to 2014 was primarily due to costs incurred in connection with our aducanumab program for Alzheimer's disease, which advanced to a late stage program during the third quarter of 2015, the BAN2401 program for Alzheimer’s disease related to our collaboration with Eisai and our BIIB074 program for TGN. These increases were partially offset by a decrease in costs incurred in connection with our late stage programs. Research and development expense related to our early stage programs increased over the prior year comparative periods primarily due to costs incurred in the advancement of our Anti-LINGOSPINRAZA program in MS, our BIIB037 program for Alzheimer’s disease, BAN2401, a program for Alzheimer’s disease related to our collaboration agreement with Eisai and an increase in spending incurred in connection with our development of STX-100 for the treatment of idiopathic pulmonary fibrosis. The increase in spending associated with marketed products is relatedSMA as the program advanced to ALPROLIX, ELOCTATE and PLEGRIDY, which were recently approved, and costs associated with TYSABRI, which previously were shared with Elan and now are recorded 100% by us upon our acquisition of all remaining rights to TYSABRI from Elan in April 2013. The increase in other research and development costs were related to increased workforce and infrastructure spend in support of core research and development activities.
The decrease in spending associated with oura late stage product candidates was driven by approvals of ALPROLIX, ELOCTATE and PLEGRIDY in 2014 and GAZYVA in the fourth quarter of 2013, partially offset by costs incurred in the development of ISIS-SMNRx for the treatment of SMA.
For 2013 compared to 2012, the increase in research and development expense was primarily related to an increase in costs incurred in connection with our marketed products, early stage programs and upfront and milestone payments partially offset by a decrease in costs incurred in connection with our late stage programs. The increase in spending associated with marketed products is related to TECFIDERA and costs associated with TYSABRI, which previously were shared with Elan. Research and development expense related to our early stage programs increased over the prior year primarily due to costs incurred in the advancement of our Anti-LINGO program in MS, our BIIB037 program for Alzheimer’s disease, our anti-TWEAK program for lupus nephritis, and an increase in spending incurred in connection with our development of STX-100 for the treatment of idiopathic pulmonary fibrosis.
The decrease in spending associated with our late stage product candidates was driven by the discontinuation of dexpramipexole, decreased clinical trial activity associated with ELOCTATE and ALPROLIX, which had clinical trials conclude in 2012, and the FDA approval of TECFIDERA in the U.S. during the first quarter of 2013. At the end of December 2012, we learned that a Phase 3 trial investigating dexpramipexole in people with amyotrophic lateral sclerosis (ALS) did not meet its primary endpoint and failed to show efficacy in its key secondary endpoints. Based on these results, we discontinued development of dexpramipexole in ALS.2015. 
We intend to continue committing significant resources to targeted research and development opportunities where there is a significant unmet need and where the drug candidate has the potential to be highly differentiated. Specifically, we intend to continue to invest in our MS pipeline, our aducanumab program, the BAN2401 and in pursuing additional therapies for autoimmune disorders, neurodegenerative diseasesE2609 programs and hematologic conditions.our BIIB074 program.


Milestone and Upfront PaymentsExpenses included in Research and Development Expense
Research and development expense for 2016 includes a $75.0 million license fee paid to Ionis as we exercised our option to develop and commercialize SPINRAZA from Ionis, a $50.0 million milestone payment due to Eisai related to the initiation of a Phase 3 trial for E2609 and a $20.0 million upfront milestone paid to the UPenn upon entering into a collaboration and alliance. For additional information about these transactions, please read Note 19, 2014Collaborative and Other Relationships to our consolidated financial statements included in this report.
Research and development expense for 2015 includes $60.0 million recorded upon entering into our collaboration with Mitsubishi Tanabe Pharma Corporation (MTPC), $48.1 million recorded upon entering into our collaboration with Applied Genetic Technologies Corporation (AGTC), $30.0 million recorded as milestones in relation to our collaboration agreements with Ionis and $16.0 million paid to AbbVie related to milestones for the development of ZINBRYTA as a result of filing with the FDA and EMA during the year. For additional information about these transactions, please read Note 19, Collaborative and Other Relationships to our consolidated financial statements included in this report.
Research and development expense for 2014 includes $139.3 million recorded in connection with our collaboration agreement with Eisai Co., Ltd. (Eisai), $25.0 million recorded as milestones in relation to our collaboration agreements with IsisIonis and an aggregate of $60.0 million related to upfront payments made to Sangamo and Google Inc. and for other strategic business arrangements. For additional information about these transactions, please read Note 20, Collaborative and Other Relationships to our consolidated financial statements included within this report. Included in total research and development expense in 2013 were charges of $75.0 million related to an upfront payment made to Isis in September 2013 upon entering into a six year research collaboration with Isis under which both companies will perform research and then seek to develop and commercialize antisense or other therapeutics for the treatment of neurological disorders, $36.0 million related to upfront and milestone payments made to Samsung Bioepis in December 2013 upon entering into a development and commercialization agreement and a $10.0 million milestone payment made to Isis related to the selection and advancement of ISIS-DMPKRx to treat mytonic dystrophy (DM1).
These payments are classified as research and development expense as the programs they relate to havehad not achieved regulatory approval. Research and development expense in 2012 included charges totaling $71.0 million related to upfront payments made to Isis in January, June and December 2012 upon entering into three separate agreements forapproval as of the development of Isis’ antisense investigational drug ISIS-SMNRx for the treatment of SMA, product candidates related to the treatment of DM1, and antisense therapeutics for up to three gene targets, respectively.

46payment date.


Selling, General and Administrative
 
For the Years Ended
December 31,
 % Change
 2014 compared to 2013 2013 compared to 2012
(In millions, except percentages)2014 2013 2012 
Selling, general and administrative$2,232.3
 $1,712.1
 $1,277.5
 30.4% 34.0%
For 20142016 compared to 2013,2015, the decrease in selling, general and administrative expenses reflects cost savings in connection with our corporate restructuring, which are described below under the heading "Restructuring Charges," partially offset by an increase in costs associated with developing commercial capabilities for ZINBRYTA and SPINRAZA.
For 2015 compared to 2014, the decrease in selling, general and administrative expenses was primarily driven by costs associated with developing commercial capabilities for our recent product launches along with an increasea decrease in salescorporate giving, incentive compensation and marketing activities in supportthe positive impact of our MS products. The successful commercializationforeign currency translation of new and potential new products requires significant investments, such as sales force build and development, training, marketing, and other related activities. The increase in selling, general, and administrative expense was also driven$87.6 million, partially offset by an increase in corporate giving and the recognition of $21.9$38.9 million of additional BPD fee expense. For additional information related to the BPD fee, please read “The Patient Protection and Affordable Care Act (PPACA)” in this “Management’s Discussion and Analysis of Financial Condition and Results of Operations.”
For 2013 compared to 2012, the increase in selling, general and administrative expense was primarily driven by costs associated with developing commercial capabilities for the product launch of TECFIDERA and the potential product launches of ELOCTATE and ALPROLIX, an increase in sales and marketing activities in support of AVONEX and TYSABRI and the $27.2 million charge recognized in relation to exiting our Weston, Massachusetts facility. For additional information related to this charge, please read Note 11, Property, Plant and Equipment to our consolidated financial statements included in this report. The increase in sales and marketing activities in support of TYSABRI were primarily driven by assuming 100% responsibility of activities as a result of our acquisition of all remaining rights to TYSABRI from Elan. In addition, the increase in selling, general, and administrative expense was driven by an increase in share-based compensation expense, partially offset by a reduction in grant and sponsorship activity.
We remain focused on our recent product launches. As discussed above, we continue to invest in commercial capabilities in support of our TECFIDERA program, and we have continued to make investments in the development of commercial capabilities for our hemophilia products.
Amortization of Acquired Intangible Assets
 
For the Years Ended
December 31,
 % Change
 2014 compared to 2013 2013 compared to 2012
(In millions, except percentages)2014 2013 2012 
Amortization of acquired intangible assets$489.8
 $342.9
 $202.2
 42.8% 69.6%
For 2014 compared to 2013, the change in amortization of acquired intangible assets was primarily driven by a $60.2 million increase in amortization of acquired and in-licensed rights and patents as we recognized a full year of expense related to our TYSABRI rights in 2014 versus nine months of expense in 2013, total impairment charges of $50.9 million related to one of our out-licensed patents and one of our IPR&D intangible assets, and lower expected lifetime revenues of AVONEX as discussed further below. For additional information related to the amortization of acquired intangible assets, please read Note 7, Intangible Assets and Goodwill to our consolidated financial statements included within this report. For 2013 compared to 2012, the change in amortization of acquired intangible assets was primarily driven by our acquisition of all remaining rights to TYSABRI from Elan and an increase in the amount of amortization recorded in relation to our AVONEX intangible asset.
Our amortization expense is based on the economic consumption of the intangible assets. Our most significant intangible assets are related to our AVONEX and TYSABRI products. Annually, during our long-range planning cycle, we perform an analysis of anticipated lifetime revenues of AVONEX and TYSABRI.


Our most recent long range planning cycle was updatedcompleted in the third quarter of 2014. Our analysis included an increase in the expected future product revenues of TYSABRI, resulting in a decrease in amortization expense as compared to prior quarters. Our analysis also included a decrease in the expected future product revenues of AVONEX, resulting in an increase in amortization expense as compared to prior quarters. The results of our TYSABRI and AVONEX analyses were impacted by changes in the estimated impact of TECFIDERA, as well as other existing and potential oral and alternative MS formulations, including PLEGRIDY, that may compete with TYSABRI and AVONEX.2016. Based upon this more recent analysis, the estimated future amortization forof acquired intangible assets is expected to be as follows:

47


(In millions)As of December 31, 2014As of December 31, 2016
2015$344.3
2016313.2
2017286.3
$334.8
2018283.7
312.7
2019273.6
295.2
Total$1,501.1
2020259.7
2021242.8
We monitor events and expectations regarding product performance. If there are any indicationsnew information indicates that the assumptions underlying our most recent analysis would beare substantially different than those utilized withinin our current estimates, our analysis would be updated and may result in a significant change in the anticipated lifetime revenues of the relevant process. The occurrence of an adverse event could substantially increase the amount of amortization expense associated with our acquired intangible assets as compared to previous periods or our current expectations, which may result in a significant negative impact on our future results of operations.
For 2016 compared to 2015, the amortization of acquired intangible assets was relatively consistent as our most recent analysis completed during the third quarter of 2016 resulted in no significant net change in our expected rate of amortization for acquired intangible assets.
For 2015 compared to 2014, the decrease in amortization of acquired intangible assets was primarily driven by a decrease in AVONEX revenues during the comparative periods and the impact of higher expected lifetime revenues of AVONEX due to a slower than previously expected adoption of PLEGRIDY. Amortization of acquired intangible assets during 2014 included total impairment charges of $50.9 million related to one of our out-licensed patents and one of our in-process research and development (IPR&D) intangible assets.
For additional information related to the amortization of acquired intangible assets, please read Note 6, Intangible Assets and Goodwill to our consolidated financial statements included in this report.
Impairment of Intangible Assets
We record charges associated with impairments of intangible assets in amortization of intangible assets. The field
During 2016 we terminated our collaboration agreements with Rodin Therapeutics, Inc. and Ataxion Inc., resulting in impairment losses of developing idiopathic pulmonary fibrosis (IPF) treatments is highly competitive$8.7 million and characterized by rapid technological advances as two of$3.5 million, respectively, related to the IPR&D assets recorded upon entering into the collaboration agreements.
Impairment charges related to our competitors filed marketing applicationsintangible assets during the second quarter of2015 were insignificant.
During 2014 seeking approval for potentially competitive treatment regimens. There can be no assurance that we will be able to successfully develop STX-100 for the treatment of IPF (STX-100 in IPF). During the second quarter of 2014, we determined that there were indicators that the value of the STX-100 in IPF intangible asset may have become impaired. As a result of our impairment testing, we determined that no impairment was required.
During 2014, we recorded a charge of $34.7 million related to the impairment of one of our out-licensed patents to reflect a change in its estimated fair value, due to a change in the underlying competitive market for that product, which occurred during the first quarter of 2014.product.
During the third quarter of 2014, we updated the probabilities of success related to the early stage programs acquired through our recent acquisitions. This change in probability of success, combined with a delay in one of the projects, resulted in an impairment loss of $16.2 million. 
For additional information, please read Note 7,6, Intangible Assets and Goodwill to our consolidated financial statements included withinin this report.
IPR&D
Overall, the value of our acquired IPR&D assets is dependent upon a number of variables, including estimates of future revenues and the effects of competition, the level of anticipated development costs and the probability and timing of successfully advancing a particular research program from a clinical trial phase to the next. We are continually reevaluating our estimates concerning these variables and evaluating industry data regarding the productivity of clinical research and the development process. Changes in our estimates of items may result in a significant change to our valuation of these assets.
The field of developing treatments for forms of neuropathic pain, such as TGN, and idiopathic pulmonary fibrosis (IPF) are highly competitive and can be affected by changes to expected market candidates and changes in timing and the clinical development of our product candidates. There can be no assurance that we will be able to successfully develop BIIB074 for the treatment of TGN or STX-100 for the treatment of IPF, or other indications or that a successfully developed therapy will be able to secure sufficient pricing in a competitive market. Changes to clinical development plans or life cycle management strategies are evaluated regularly. We review amounts


capitalized as acquired IPR&D for impairment at least annually, as of October 31, and whenever events or changes in circumstances indicate that the carrying value of the assets might not be recoverable. Our most recent impairment assessment as of October 31, 2016 resulted in no impairments.
Collaboration Profit SharingRestructuring, Business Transformation and Other Cost Saving Initiatives
2015 Cost Saving Initiatives
2015 Restructuring Charges
On October 21, 2015, we announced a corporate restructuring, which included the termination of certain pipeline programs and an 11% reduction in workforce. As a result of these initiatives, we reduced our annual run rate of operating expenses by $250 million and reinvested these savings to support the advancement of our high potential pipeline candidates and key commercial activities.
Under this restructuring, cash payments were estimated to total $120 million, of which $15.9 million were related to previously accrued 2015 incentive compensation, resulting in net restructuring charges totaling approximately $102.0 million. These amounts were substantially incurred and paid by the end of 2016.
For the years ended December 31, 2016 and 2015, we recognized total net restructuring charges of $8.0 million and $93.4 million, respectively.
The following table summarizes the charges and spending related to our 2015 restructuring program during 2016:
 
For the Years Ended
December 31,
 % Change
 2014 compared to 2013 2013 compared to 2012
(In millions, except percentages)2014 2013 2012 
Collaboration profit sharing$
 $85.4
 $317.9
 (100.0)% (73.1)%
(In millions)
Workforce
Reduction
 
Pipeline
Programs
 Total
Restructuring reserve as of December 31, 2015$33.7
 $3.6
 $37.3
Expense4.9
 5.4
 10.3
Payment(31.2) (9.0) (40.2)
Adjustments to previous estimates, net(5.2) 2.9
 (2.3)
Restructuring reserve as of December 31, 2016$2.2
 $2.9
 $5.1
Upon2016 Organizational Changes and Cost Saving Initiatives
2016 Restructuring Charges
During the closingthird quarter of 2016 we initiated additional cost saving measures primarily intended to realign our organizational structure due to the changes in roles and workforce resulting from our decision to spin off our hemophilia business, and to achieve further targeted cost reductions. For 2016 we recognized charges totaling $17.7 million related to this effort, which are in addition to, and separate from, the 2015 corporate restructuring described above. These amounts, which were substantially incurred and paid by the end of 2016, are primarily related to severance and are reflected in restructuring charges in our consolidated statements of income.
Cambridge, MA Manufacturing Facility
In June 2016 following an evaluation of our acquisition of all remainingcurrent and future manufacturing capabilities and capacity needs, we determined that we intend to vacate and cease manufacturing in our 67,000 square foot small-scale biologics manufacturing facility in Cambridge, MA and also vacate our 46,000 square foot warehouse space in Somerville, MA.
In December 2016 we subleased our rights to TYSABRI,the manufacturing facility in Cambridge, MA to Brammer. Brammer also purchased from us certain manufacturing equipment, leasehold improvements and other assets in exchange for shares of Brammer common LLC interests and assumed manufacturing operations effective January 1, 2017. In December 2016 we also closed and vacated our collaboration agreementwarehouse space in Somerville, MA.


Our departure from these facilities shortened the expected useful lives of certain leasehold improvements and other assets at these facilities. As a result, we recorded additional depreciation expense to reflect the assets' new shorter useful lives. For the year ended December 31, 2016, we recognized approximately $45.5 million of this additional depreciation, which was terminated, and we no longer record collaboration profit sharing. Collaboration profit sharing previously included the portionrecorded as cost of restsales in our consolidated statement of world net operating profits to be shared with Elan underincome.
Under the terms of our collaborationthe agreement, Brammer will also provide manufacturing and other transition and support services to us.
In the fourth quarter of 2016 we recognized charges totaling $7.4 million for the development, manufactureseverance costs related to certain employees separated from Biogen in connection with this transaction. These amounts will be substantially incurred and commercialization of TYSABRI. The amount also included the reimbursement for our portion of third-party royalties paid by Elan on behalfthe end of the collaboration relating to restfirst quarter of world sales. For 2012, our collaboration profit sharing expense included $53.2 million related to the reimbursement of third-party royalty payments made by Elan, which started to expire2017 and are reflected in 2013. For additional information about this collaboration, please read Note 20, Collaborative and Other Relationships torestructuring charges in our consolidated financial statements included in this report.of income.

48


(Gain) Loss on Fair Value Remeasurement of Contingent Consideration
 
For the Years Ended
December 31,
 % Change
 2014 compared to 2013 2013 compared to 2012
(In millions, except percentages)2014 2013 2012 
(Gain) loss on fair value remeasurement of contingent consideration$(38.9) $(0.5) $27.2
 ** (102.0)%
The consideration for certain of our business combinations includes future payments that are contingent upon the occurrence of a particular factor or factors. For business combinations completed after January 1, 2009, weWe record an obligation for such contingent consideration payments at its fair value on the acquisition date. We then revalue our contingent consideration obligations each reporting period. Changes in the fair value of our contingent consideration obligations, other than changes due to payments, are recognized as a (gain) loss on fair value remeasurement of contingent consideration withinin our consolidated statements of income.
The increaseloss on fair value remeasurement of contingent consideration for 2016 was primarily due to changes in the probability of achieving certain developmental milestones and changes in the discount rate.
The loss on fair value remeasurement of contingent consideration for 2015 was primarily due to changes in the expected timing and probabilities of success related to the achievement of certain developmental milestones and in the discount rate.
The gain on fair value remeasurement of contingent consideration for 2014 was primarily due to an adjustment to the value of our contingent consideration liabilities as we updated the probabilities of success related to the early stage programs acquired through our recent acquisitions. For additional information, please read Note 7, Intangible Assets and Goodwill to our consolidated financial statements included within this report.
Gain on Sale of Rights
 
For the Years Ended
December 31,
 % Change
 2014 compared to 2013 2013 compared to 2012
(In millions, except percentages)2014 2013 2012 
Gain on sale of rights$16.8
 $24.9
 $46.8
 (32.7)% (46.8)%
During the third quarter of 2012, we sold all of our rights, including rights to royalties, related to BENLYSTA (belimumab) to a DRI Capital managed fund (DRI). Under the terms of the BENLYSTA sale agreement, we received payments from DRI equal to a multiple of royalties payable by the Human Genome Sciences, Inc. and GlaxoSmithKline plc for the period covering October 2011 to September 2014 and a one-time contingency payment that could be paid to us if the cumulative royalties over the full royalty term exceed an agreed amount.
For 2014 compared to 2013, we recognized lower payments from the sale of our rights to BENLYSTA resulting from a lower multiple of sales being applied in 2014 as compared to 2013. For 2013 compared to 2012, we recognized lower payments from the sale of our rights to BENLYSTA resulting from a lower multiple of sales being applied in 2013 as compared to 2012. As the period under which we would receive royalties expired in September 2014, we will not receive any additional payments under this agreement. For additional information related to this transaction, please read Note 3, Gain on Sale of RightsFair Value Measurements to our consolidated financial statements included in this report.
Other Income (Expense), Net
Collaboration Profit (Loss) Sharing
 
For the Years Ended
December 31,
 % Change
 2014 compared to 2013 2013 compared to 2012
(In millions, except percentages)2014 2013 2012 
Other income (expense), net$(25.8) $(34.9) $(0.7) (26.2)% **
For 2014 compared to 2013,Collaboration profit (loss) sharing includes our 50% share of the change in other income (expense), net was due to lower non-income based state taxes, an increase in interest income due to higher average cash, cash equivalents and marketable securities balances, lower foreign exchange losses and decreased interest expense as we repaid our 6.0% Senior Notes in March 2013, partially offset by lower gains on investments. For 2013 compared to 2012, the change in other income (expense), net was due to a decrease in interest income due to lower average cash, cash equivalent and marketable securities balances primarilyprofit or loss related to our biosimilars commercial agreement with Samsung Bioepis and our 50% share of the use of cashco-promotion profits or losses in connection with our acquisition of all remaining rights to TYSABRI from Elanthe E.U. and the repayment of our 6.0% Senior Notes, a decrease in other, net primarilyCanada related to higher non-income based state taxes and higher foreign exchange losses. Other income (expense), net in 2012 includes a gain of $9.0 million recognized upon our acquisition of Stromedix in March 2012, which was basedcollaboration agreement with AbbVie on the value derived fromcommercialization of ZINBRYTA.
We began to recognize revenues on sales of biosimilars in the purchase pricefirst quarter of 2016. For 2016 we recognized net expense of $15.1 million related to our equity interest heldbiosimilars commercial agreement with Samsung.
We began to recognize revenues on sales of ZINBRYTA in Stromedix priorthe E.U. in the third quarter of 2016. For 2016 we also recognized income of $4.9 million to reflect AbbVie's 50% share of net collaboration losses in the acquisition.E.U. and Canada.
For additional information related to our strategic investments,these arrangements, please read Note 9,19, Financial InstrumentsCollaborative and Other Relationships to our consolidated financial statements included in this report.

49



TECFIDERA Litigation Settlement and License Charges
In January 2017 we agreed to enter into a settlement and license agreement with Forward Pharma A/S (Forward Pharma) that will provide us an irrevocable license to all intellectual property owned by Forward Pharma and results in the termination of the German Infringement Litigation. Under the terms of the settlement and license agreement with Forward Pharma, we have agreed to pay Forward Pharma $1.25 billion in cash. During the fourth quarter of 2016 we recognized a pre-tax charge of $454.8 million related to this matter. This amount represents the fair value of estimated royalties on our sales of TECFIDERA during the period April 2014 through December 31, 2016. For additional information related to the agreement, please read Note 21, Commitments and Contingencies to our consolidated financial statements included in this report.
Other Income (Expense), Net
For 2016 compared to 2015, the change in other income (expense), net was primarily due to an increase in interest expense as a result of the issuance of our senior unsecured notes in the third quarter of 2015. This increase was partially offset by an increase in interest income on higher yields and cash, cash equivalents and marketable securities balances as well as a decrease in foreign exchange losses recognized during the year ended December 31, 2016, compared to the prior year comparative period.
For 2015 compared to 2014, the change in other income (expense), net was primarily due to an increase in interest expense as a result of the issuance of our senior unsecured notes in the third quarter of 2015, higher foreign exchange losses and a decrease in net gains recognized on the sale of our strategic investments and marketable securities.
For additional information related to our senior unsecured notes, please read Note 11, Indebtedness, to our consolidated financial statements included in this report.


Income Tax Provision
 
For the Years Ended
December 31,
 % Change
 2014 compared to 2013 2013 compared to 2012
(In millions, except percentages)2014 2013 2012 
Effective tax rate on pre-tax income25.1% 24.2% 25.4% 3.7% (4.7)%
Income tax expense$989.9
 $601.0
 $470.6
 64.7% 27.7 %
Our effective tax rate fluctuates from year to year due to the global nature of our operations. The factors that most significantly impact our effective tax rate include variability in the allocation of our taxable earnings among multiple jurisdictions, changes in tax laws, the amount and characterization of our research and development expenses, the levels of certain deductions and credits, acquisitions and licensing transactions.
Our effective tax rate for 20142016 compared to 20132015 increased primarily asdue to a resultnet state tax benefit in 2015 of $27.0 million resulting from the absenceremeasurement of a benefit related to the 2013 change inone of our uncertain tax position related to our U.S. federal manufacturing deduction and our unconsolidated joint business described below under "Accounting for Uncertainty in Income Taxes", lower current year expenses eligible for the orphan drug creditpositions and a lowerhigher relative manufacturing deduction due to unqualified products, partially offset by a higher percentage of our 2014 incomeearnings being earned outsideattributed to the U.S., a higher tax jurisdiction.
Our effective tax rate for 20132015 compared to 2012 decreased primarily as2014 benefited from lower anticipated taxes on foreign earnings and reflects a result of a change in our uncertain tax position related to our U.S. federal manufacturing deduction and our unconsolidated joint business, described below under "Accounting for Uncertainty in Income Taxes", lower intercompany royalties owed by a foreign wholly owned subsidiary to a U.S. wholly owned subsidiary on$27.0 million benefit from the international sales2015 remeasurement of one of our products, the reinstatement of the federal research and developmentuncertain tax credit and the 2012 correction of an error in our deferred tax accounting, which increased our rate in the prior year. These favorable items were partially offset by higher relative earnings in the U.S. from the commercial launch of TECFIDERA, lower orphan drug credits due to reduced expenditures in eligible clinical trials and higher state taxes.positions.
Accounting for Uncertainty in Income Taxes
During 2013, we received updated technical guidance from the IRS concerning the calculation of our U.S. federal manufacturing deduction and overall tax classification of our unconsolidated joint business for the current and prior year filings. Based on this guidance we reevaluated the level of our unrecognized benefits related to uncertain tax positions and recorded a $49.8 million income tax benefit. This benefit was for a previously unrecognized position and related to years 2005 through 2012. We recorded an offsetting expense of $11.3 million for non-income based state taxes, which was recorded in other income (expense) within our consolidated statements of income.
For more information on our uncertain tax positions and income tax rate reconciliation for 2014, 20132016, 2015 and 2012,2014, please read Note 17,16, Income Taxes to our consolidated financial statements included in this report.
Equity in Loss of Investee, Net of Tax
 
For the Years Ended
December 31,
 % Change
 2014 compared to 2013 2013 compared to 2012
(In millions, except percentages)2014 2013 2012 
Equity in loss of investee, net of tax$15.1
 $17.2
 $4.5
 (12.2)% 281.2%
In February 2012 we entered into an agreement with Samsung BioLogics Co. Ltd.,Biologics, establishing an entity, Samsung Bioepis, to develop, manufacture and market biosimilar pharmaceuticals. We account for this investment under the equity method of accounting. We recognize our share of the results of operations related to our investment in Samsung Bioepis one quarter in arrears.
During 2015 our share of losses exceeded the carrying value of our investment. We therefore suspended recognizing additional losses and will continue to do so unless we commit to providing additional funding.
For 20142015 compared to 2013,2014, the decrease in our equity in loss of investee, net of tax, was due to the joint venture's clinical trial activity, partially offset by our recognitionsuspension of a gain as Samsung Bioepis secured additional equity financing from Samsung Biologics from a financing in which we did participate. For 2013 compared to 2012, the increase in equity in loss of investee, net of tax wasmethod investment losses due to increased clinical trial activity. our share of losses exceeding the carrying value of our investment in 2015 and a decrease in our ownership interest.
For additional information related to this transaction, please read Note 20,19, Collaborative and Other Relationships to our consolidated financial statements included in this report.

50


Noncontrolling Interest
 
For the Years Ended
December 31,
 % Change
 2014 compared to 2013 2013 compared to 2012
(In millions, except percentages)2014 2013 2012 
Net income attributable to noncontrolling interests, net of tax$6.8
 $
 $
 ** **
For 20142016 compared to 2013,2015, the change in net income (loss) attributable to noncontrolling interests, net of tax, was primarily related to a $10.0$60.0 million milestone payment made to Neurimmune andSubOne AG (Neurimmune) in 2015.
For 2015 compared to 2014, the consolidationchange in net income (loss) attributable to noncontrolling interests, net of thetax, was primarily related to a $60.0 million milestone payment made to Neurimmune, partially offset by increases in research activities of Ataxion. expenses attributable to noncontrolling interests.
For additional information about these transactions,Neurimmune, please read Note 19,18, Investments in Variable Interest Entities to our consolidated financial statements included withinin this report.


Financial Condition, Liquidity and Capital Resources
Our financial condition is summarized as follows:
 As of December 31, % Change
(In millions, except percentages)2016 2015 2016 compared to 2015
Financial assets:     
Cash and cash equivalents$2,326.5
 $1,308.0
 77.9 %
Marketable securities — current2,568.6
 2,120.5
 21.1 %
Marketable securities — non-current2,829.4
 2,760.4
 2.5 %
Total cash, cash equivalents and marketable securities$7,724.5
 $6,188.9
 24.8 %
Borrowings:     
Current portion of notes payable and other financing arrangements$4.7
 $4.8
 (2.1)%
Notes payable and other financing arrangements6,512.7
 6,521.5
 (0.1)%
Total borrowings$6,517.4
 $6,526.3
 (0.1)%
Working Capital:     
Current assets$8,732.2
 $6,700.3
 30.3 %
Current liabilities(3,419.9) (2,577.7) 32.7 %
Total working capital$5,312.3
 $4,122.6
 28.9 %
For the year ended December 31, 2016, certain significant cash flows were as follows:
$4.5 billion in net cash flows provided by operating activities;
$1.0 billion used for share repurchases;
$1.6 billion in total net payments for income taxes;
$1.2 billion in contingent payments made to former shareholders of Fumapharm AG and holders of their rights; and
$616.1 million used for purchases of property, plant and equipment.
$102.0 million used for upfront and milestone payments to Samsung Bioepis, AbbVie and UPenn; and
$75.0 million license fee payment made to Ionis.
For the year ended December 31, 2015, certain significant cash flows were as follows:
$3.7 billion in net cash flows provided by operating activities;
$5.9 billion in proceeds from the issuance of our senior unsecured notes;
$5.0 billion used for share repurchases;
$1.7 billion in total net payments for income taxes;
$850.0 million in contingent payments made to former shareholders of Fumapharm AG and holders of their rights;
$643.0 million used for purchases of property, plant and equipment, including $104.8 million related to the acquisition of Eisai's drug product manufacturing facility in Research Triangle Park (RTP), North Carolina and $62.5 million related to the acquisition of land in Solothurn, Switzerland;
$198.8 million net cash paid for the acquisition of Convergence; and
$244.0 million used for upfront and milestone payments to AGTC, MTPC and Neurimmune.


Overview
We have historically financed our operating and capital expenditures primarily through cash flows earned through our operations. We expect to continue funding our current and planned operating requirements principally through our cash flows from operations, as well as our existing cash resources. We believe that our existing funds, when combined with cash generated from operations and our access to additional financing resources, if needed, are sufficient to satisfy our operating, working capital, strategic alliance, milestone payment, capital expenditure and debt service requirements for the foreseeable future. In addition, we may choose to opportunistically return cash to shareholders and pursue other business initiatives, including acquisition and licensing activities. We may, from time to time, also seek additional funding through a combination of new collaborative agreements, strategic alliances and additional equity and debt financings or from other sources should we identify a significant new opportunity.
The undistributed cumulative foreign earnings of certain of our foreign subsidiaries, exclusive of earnings that would result in little or no net income tax expense under current U.S. tax law or which has already been subject to tax under U.S. tax law, are invested indefinitely outside the U.S.
Of the total cash, cash equivalents and marketable securities at December 31, 2016, approximately $5.5 billion was generated in foreign jurisdictions and is primarily intended for use in our foreign operations or in connection with business development transactions outside of the U.S. In managing our day-to-day liquidity in the U.S., we do not rely on the unrepatriated earnings as a source of funds and we have not provided for U.S. federal or state income taxes on these undistributed foreign earnings.
For additional information related to certain risks that could negatively impact our financial position or future results of operations, please read the “Risk Factors” and “Quantitative and Qualitative Disclosures About Market Risk” sections of this report.
Share Repurchase Programs
In July 2016 our Board of Directors authorized a program to repurchase up to $5.0 billion of our common stock (2016 Share Repurchase Program). This authorization does not have an expiration date. Repurchased shares will be retired. During the year ended December 31, 2016, we repurchased and retired 3.3 million shares of common stock at a cost of $1.0 billion under our 2016 Share Repurchase
Program.
In May 2015 our Board of Directors authorized a program to repurchase up to $5.0 billion of our common stock (2015 Share Repurchase Program), which was completed as of December 31, 2015. As of December 31, 2015, we repurchased and retired approximately 16.8 million shares of common stock at a cost of $5.0 billion under our 2015 Share Repurchase Program.
In February 2011 our Board of Directors authorized a program to repurchase up to 20.0 million of our common stock (2011 Share Repurchase Program), which has been used principally to offset common stock issuances under our share-based compensation plans. The 2011 Share Repurchase Program does not have an expiration date. We did not repurchase any shares of common stock under our 2011 Share Repurchase Program during the years ended December 31, 2016 and 2015. During the year ended December 31, 2014, we purchased approximately 2.9 million shares of common stock at a cost of $886.8 million under our 2011 Share Repurchase Program. We have approximately 1.3 million shares remaining available for repurchase under the 2011 Share Repurchase Program.
Cash, Cash Equivalents and Marketable Securities
Until required for another use in our business, we typically invest our cash reserves in bank deposits, certificates of deposit, commercial paper, corporate notes, U.S. and foreign government instruments and other interest bearing marketable debt instruments in accordance with our investment policy. It is our policy to mitigate credit risk in our cash reserves and marketable securities by maintaining a well-diversified portfolio that limits the amount of exposure as to institution, maturity and investment type.
The net increase in cash, cash equivalents and marketable securities at December 31, 2016, from December 31, 2015, is primarily due to net cash flows provided by operating activities, partially offset by purchases of our common stock, payments for income taxes, contingent payments made to former shareholders of Fumapharm AG and holders of their rights, the net purchases of property, plant and equipment and upfront and milestone payments related to our collaboration agreements.


Borrowings
The following is a summary of our principal indebtedness:
$550.0 million aggregate principal amount of 6.875% Senior Notes due March 1, 2018;
$1.5 billion aggregate principal amount of 2.90% Senior Notes due September 15, 2020;
$1.0 billion aggregate principal amount of 3.625% Senior Notes due September 15, 2022;
$1.75 billion aggregate principal amount of 4.05% Senior Notes due September 15, 2025; and
$1.75 billion aggregate principal amount of 5.20% Senior Notes due September 15, 2045.
These senior unsecured notes were issued at a discount and are amortized as additional interest expense over the period from issuance through maturity.
During the third quarter of 2015, we entered into a $1.0 billion, five-year senior unsecured revolving credit facility under which we are permitted to draw funds for working capital and general corporate purposes. The terms of the revolving credit facility include a financial covenant that requires us not to exceed a maximum consolidated leverage ratio. As of December 31, 2016, we had no outstanding borrowings and were in compliance with all covenants
under this facility.
In connection with our 2006 distribution agreement with Fumedica AG (Fumedica), we issued notes totaling 61.4 million Swiss Francs that were payable to Fumedica in varying amounts from June 2008 through June 2018. Our remaining note payable to Fumedica had a carrying value of 6.2 million Swiss Francs ($6.0 million) and 8.9 million Swiss Francs ($9.0 million) as of December 31, 2016 and 2015, respectively.
For a summary of the fair values of our outstanding borrowings as of December 31, 2016 and 2015, please read Note 7, Fair Value Measurements to our consolidated financial statements included in this report.
Working Capital
We define working capital as current assets less current liabilities. The increase in working capital at December 31, 2016, from December 31, 2015, reflects an increase in total current assets of $2,031.9 million, partially offset by an increase in current liabilities of $842.2 million. The increase in total current assets was primarily driven by an increase in cash, cash equivalents and marketable securities due to net cash flows provided by operating activities. The increase in total current liabilities primarily resulted from litigation settlement and license charges and an increase in accrued collaboration expenses.

Cash Flows
The following table summarizes our cash flow activity:
 
For the Years Ended
December 31,
 % Change
 2016 compared to 2015 2015 compared to 2014
(In millions, except percentages)2016 2015 2014 
Net cash flows provided by operating activities$4,522.4
 $3,716.1
 $2,942.1
 21.7 % 26.3 %
Net cash flows used in by investing activities$(2,484.8) $(4,553.6) $(1,543.0) (45.4)% 195.1 %
Net cash flows provided by (used in) financing activities$(987.8) $986.4
 $(755.9) (200.1)% (230.5)%
Operating Activities
Cash flows from operating activities represent the cash receipts and disbursements related to all of our activities other than investing and financing activities. We expect cash provided from operating activities will continue to be our primary source of funds to finance operating needs and capital expenditures for the foreseeable future.
Operating cash flow is derived by adjusting our net income for:
Non-cash operating items such as depreciation and amortization, impairment charges and share-based compensation charges;
Changes in operating assets and liabilities which reflect timing differences between the receipt and payment of cash associated with transactions and when they are recognized in results of operations; and


Changes associated with the fair value of contingent payments associated with our acquisitions of businesses and payments related to collaborations.
For 2016 compared to 2015, the increase in cash provided by operating activities was primarily driven by higher net income, non-cash charges for depreciation and amortization, a comparative increase in accrued expenses and other liabilities, partially offset by a comparative increase in accounts receivable.
For 2015 compared to 2014, the increase in cash provided by operating activities was primarily driven by higher net income and accounts receivable collections, partially offset by income tax payments.
Investing Activities
For 2016 compared to 2015, the decrease in net cash flows used in investing activities was primarily due to a decrease in net purchases of marketable securities and cash paid for the acquisition of Convergence in February 2015, partially offset by an increase in the contingent consideration
related to the Fumapharm AG acquisition.
For 2015 compared to 2014, the increase in net cash flows used in investing activities was primarily due to an increase in net purchases of marketable securities, an increase in the total amount of contingent consideration paid to the former shareholders of Fumapharm AG, an increase in purchases of property, plant and equipment and cash paid for the acquisition of Convergence.
Financing Activities
For 2016 compared to 2015, the decrease in net cash flows provided by financing activities was primarily due to the issuance of our senior unsecured notes issued in the third quarter of 2015, partially offset by a decrease in the purchases of common stock.
For 2015 compared to 2014, the change in net cash flows provided by financing activities was primarily due to the issuance of our 2015 Senior Notes, partially offset by an increase in the amount of common stock we repurchased.

Contractual Obligations and Off-Balance Sheet Arrangements
Contractual Obligations
The following table summarizes our contractual obligations as of December 31, 2016, excluding amounts related to uncertain tax positions, funding commitments, contingent development, regulatory and commercial milestone payments, TYSABRI contingent payments and contingent consideration related to our business combinations, as described below.
 Payments Due by Period
(In millions)Total 
Less than
1 Year
 
1 to 3
Years
 
3 to 5
Years
 
After
5 Years
Capital leases (1)$18.7
 $2.0
 $16.7
 $
 $
Non-cancellable operating leases (2), (3)549.5
 66.4
 108.2
 98.4
 276.5
Long-term debt obligations (4)10,281.1
 282.5
 1,055.1
 1,939.7
 7,003.8
Purchase and other obligations (5)1,740.1
 1,598.2
 88.5
 43.9
 9.5
Defined benefit obligation74.5
 
 
 
 74.5
Total contractual obligations$12,663.9
 $1,949.1
 $1,268.5
 $2,082.0
 $7,364.3
(1)
During 2015 we amended our existing lease related to Eisai's oral solid dose products manufacturing facility in RTP, North Carolina, where we manufacture our and Eisai's oral solid dose products. Amounts reflected within the table above include the future contractual commitments. For additional information, please read Note 10, Property, Plant and Equipment to our consolidated financial statements included in this report.
(2)We lease properties and equipment for use in our operations. Amounts reflected within the table above detail future minimum rental commitments under non-cancelable operating leases as of December 31 for each of the periods presented. In addition to the minimum rental commitments, these leases may require us to pay additional amounts for taxes, insurance, maintenance and other operating expenses.


(3)
Obligations are presented net of sublease income expected to be received for the vacated manufacturing facility in Cambridge, MA, the vacated portion of our Weston, Massachusetts facility and other facilities throughout the world. For additional information related to the sublease of the vacated manufacturing facility in Cambridge, MA, please read Note 3, Restructuring, Business Transformation and Other Cost Savings Initiatives to our consolidated financial statements included in this report.
(4)Long-term debt obligations are primarily related to our Senior Notes, including principal and interest payments.
(5)
Purchase and other obligations primarily includes our obligations to purchase direct materials, our obligation of $1.25 billion under the litigation settlement and license agreement with Forward Pharma, $176.3 million in contractual commitments for the construction of a biologics manufacturing facility in Solothurn, Switzerland and $13.6 million related to the fair value of net liabilities on derivative contracts. For additional information on the litigation settlement and license agreement with Forward Pharma please read Note 21, Commitments and Contingencies to our consolidated financial statements included in this report.
TYSABRI Contingent Payments
In 2013 we acquired from Elan full ownership of all remaining rights to TYSABRI that we did not already own or control. Under the terms of the acquisition agreement, we are obligated to make contingent payments to Elan of 18% on annual worldwide net sales up to $2.0 billion and 25% on annual worldwide net sales that exceed $2.0 billion. Royalty payments to Elan and other third parties are recognized as cost of sales in our consolidated statements of income. Elan was acquired by Perrigo in December 2013. Following that acquisition, we began making these royalty payments to Perrigo.
Contingent Consideration related to Business Combinations
In connection with our acquisitions of Convergence, Stromedix, Inc. (Stromedix) and Biogen International Neuroscience GmbH (BIN), we agreed to make additional payments based upon the achievement of certain milestone events.
As the acquisitions of Convergence, Stromedix and BIN occurred after January 1, 2009, we record contingent consideration liabilities at their fair value on the acquisition date and revalue these obligations each reporting period. We may pay up to approximately $1.2 billion in remaining milestones
related to these acquisitions. For additional information related to our acquisition of Convergence please read Note 2, Acquisitions, to our consolidated financial statements included in this report.
Fumapharm AG
In 2006 we acquired Fumapharm AG. As part of this acquisition we acquired FUMADERM and TECFIDERA (together, Fumapharm Products). We are required to make contingent payments to former shareholders of Fumapharm AG or holders of their rights based on the attainment of certain cumulative sales levels of Fumapharm Products and the level of total net sales of Fumapharm Products in the prior twelve month period, as defined in the acquisition agreement.
During 2016 we paid $1.2 billion in contingent payments as we reached the $7.0 billion, $8.0 billion, $9.0 billion and $10.0 billion cumulative sales levels related to the Fumapharm Products in the fourth quarter of 2015 and the first, second and third quarters of 2016, respectively, and accrued $300.0 million upon reaching $11.0 billion in total cumulative sales of Fumapharm Products in the fourth quarter of 2016.
We will owe an additional $300.0 million contingent payment for every additional $1.0 billion in cumulative sales level of Fumapharm Products reached if the prior 12 months sales of the Fumapharm Products exceed $3.0 billion, until such time as the cumulative sales level reaches $20.0 billion, at which time no further contingent payments shall be due. If the prior 12 months sales of Fumapharm Products are less than $3.0 billion, contingent payments remain payable on a decreasing tiered basis. These payments will be accounted for as an increase to goodwill as incurred, in accordance with the accounting standard applicable to business combinations when we acquired Fumapharm. Any portion of the payment which is tax deductible will be recorded as a reduction to goodwill. Payments are due within 60 days following the end of the quarter in which the applicable cumulative sales level has been reached.
Contingent Development, Regulatory and Commercial Milestone Payments
Based on our development plans as of December 31, 2016, we could make potential future milestone payments to third parties of up to approximately $3.1 billion, including approximately $0.5 billion in development milestones, approximately $0.8 billion in regulatory milestones and approximately $1.8 billion in commercial milestones as part of our various collaborations, including licensing and development programs. Payments under these agreements generally become due and payable


upon achievement of certain development, regulatory or commercial milestones. Because the achievement of these milestones had not occurred as of December 31, 2016, such contingencies have not been recorded in our financial statements. Amounts related to contingent milestone payments are not considered contractual obligations as they are contingent on the successful achievement of certain development, regulatory approval and commercial milestones.
We anticipate that we may pay approximately $157.0 million of milestone payments in 2017, provided various development, regulatory or commercial milestones are achieved.
Other Funding Commitments
As of December 31, 2016, we have several on-going clinical studies in various clinical trial stages. Our most significant clinical trial expenditures are to contract research organizations (CROs). The contracts with CROs are generally cancellable, with notice, at our option. We have recorded accrued expenses of approximately $21.0 million on our consolidated balance sheet for expenditures incurred by CROs as of December 31, 2016. We have approximately $500.0 million in cancellable future commitments based on existing CRO contracts as of December 31, 2016.
Tax Related Obligations
We exclude liabilities pertaining to uncertain tax positions from our summary of contractual obligations as we cannot make a reliable estimate of the period of cash settlement with the respective taxing authorities. As of December 31, 2016, we have approximately $47.8 million of net liabilities associated with uncertain tax positions.
Other Off-Balance Sheet Arrangements
We do not have any relationships with entities often referred to as structured finance or special purpose entities that were established for the purpose of facilitating off-balance sheet arrangements. As such, we are not exposed to any financing, liquidity, market or credit risk that could arise if we had engaged in such relationships. We consolidate variable interest entities if we are the primary beneficiary.
Legal Matters
For a discussion of legal matters as of December 31, 2016, please read Note 20, Litigation to our consolidated financial statements included in this report.
Critical Accounting Estimates
The preparation of our consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the U.S. (U.S. GAAP), requires us to make estimates, judgments and assumptions that may affect the reported amounts of assets, liabilities, equity, revenues and expenses and related disclosure of contingent assets and liabilities. On an on-going basis we evaluate our estimates, judgments and methodologies. We base our estimates on historical experience and on various other assumptions that we believe are reasonable, the results of which form the basis for making judgments about the carrying values of assets, liabilities and equity and the amount of revenue and expenses. Actual results may differ from these estimates under different assumptions or conditions.
Revenue Recognition and Related Allowances
We recognize revenue when all of the following criteria are met: persuasive evidence of an arrangement exists; delivery has occurred or services have been rendered; our price to the customer is fixed or determinable; and collectability is reasonably assured. For additional information related to the new accounting standard for revenues from contracts with customers please read Note 1, Summary of Significant Accounting Policies: New Accounting Pronouncements to our consolidated financial statements included in this report.
Product Revenues
Revenues from product sales are recognized when title and risk of loss have passed to the customer, which is typically upon delivery. Product revenues are recorded net of applicable reserves for discounts and allowances. The timing of distributor orders and shipments can cause variability in earnings.


Reserves for Discounts and Allowances
Revenues from product sales are recorded net of reserves established for applicable discounts and allowances, including those associated with the implementation of pricing actions in certain of the international markets in which we operate. These reserves are based on estimates of the amounts earned or to be claimed on the related sales and are classified as reductions of accounts receivable (if the amount is payable to our customer) or a liability (if the amount is payable to a party other than our customer). Our estimates take into consideration our historical experience, current contractual and statutory requirements, specific known market events and trends, industry data and forecasted customer buying and payment patterns. Actual amounts may ultimately differ from our estimates. If actual results vary, we adjust these estimates, which could have an effect on earnings in the period of adjustment.
In addition to the discounts and rebates described above and classified as a reduction of revenue, we also maintain certain customer service contracts with distributors and other customers in the distribution channel that provide us with inventory management, data and distribution services, which are generally reflected as a reduction of revenue. To the extent we can demonstrate a separable benefit and fair value for these services, we classify these payments within selling, general and administrative expenses.
Revenues from Anti-CD20 Therapeutic Programs
Revenues from anti-CD20 therapeutic programs consist of:
(i) our share of pre-tax profits and losses in the U.S. for RITUXAN and GAZYVA;
(ii)  reimbursement of our selling and development expenses in the U.S. for RITUXAN; and
(iii)revenues on sales in the rest of world for RITUXAN, which consist of our share of pre-tax co-promotion profits on RITUXAN in Canada and royalty revenue on RITUXAN sales outside the U.S. and Canada by the Roche Group and its sublicensees.
Pre-tax co-promotion profits on RITUXAN and GAZYVA are calculated and paid to us by Genentech in the U.S. Pre-tax co-promotion profits on RITUXAN are calculated and paid to us by the Roche Group in Canada. Pre-tax co-promotion profits consist of U.S. and Canadian net sales to third-party customers less applicable costs to manufacture, third-party royalty expenses, distribution, selling and marketing expenses, and joint development expenses incurred by Genentech, the Roche Group and us. We record our share of the pre-tax co-promotion profits on RITUXAN in Canada and royalty revenues on RITUXAN sales outside the U.S. on a cash basis as we do not have the ability to estimate these profits or royalty revenue in the period incurred. Our share of the pre-tax profits on RITUXAN and GAZYVA in the U.S. includes estimates made by Genentech and those estimates are subject to change. Actual results may differ from our estimates.
Concentrations of Credit Risk
The majority of our accounts receivable arise from product sales in the U.S. and Europe and are primarily due from wholesale distributors, public hospitals and other government entities. We monitor the financial performance and creditworthiness of our customers so that we can properly assess and respond to changes in their credit profile. We continue to monitor these conditions, including the volatility associated with international economies and the relevant financial markets, and assess their possible impact on our business. Credit and economic conditions in the E.U. continue to remain uncertain, which has, from time to time, led to longer collection periods for our accounts receivable and greater collection risk in certain countries.
Where our collections continue to be subject to significant payment delays due to government funding and reimbursement practices and a portion of these receivables are routinely being collected beyond our contractual payment terms and over periods in excess of one year, we have discounted our receivables and reduced related revenues based on the period of time that we estimate those amounts will be paid, to the extent such period exceeds one year, using the country’s market-based borrowing rate for such period. The related receivables are classified at the time of sale as non-current assets.
To date, we have not experienced any significant losses with respect to the collection of our accounts receivable. If economic conditions worsen and/or the financial condition of our customers were to further deteriorate, our risk of collectability may increase, which may result in additional allowances and/or significant bad debts.


For additional information related to our concentration of credit risk associated with our accounts receivable balances, please read the subsection entitled “Credit Risk” in the “Quantitative and Qualitative Disclosures About Market Risk” section of this report.
Collaborative and Other Relationships
Our development and commercialization arrangements with Sobi and AbbVie represent collaborative arrangements as each party is an active participant and exposed to significant risks and rewards of the arrangements. Where we are the principal on sales transactions with third parties, we recognize revenue, cost of sales and sales and marketing expenses on a gross basis in their respective lines in our consolidated statements of income. Where we are not the principal on sales transactions with third parties, we record our share of the revenues, cost of sales and sales and marketing expenses on a net basis in collaborative and other relationships in our consolidated statements of income.
For additional information related to our collaborations with Sobi and AbbVie, please read Note 19, Collaborative and Other Relationships to these consolidated financial statements.
Capitalization of Inventory Costs
We capitalize inventory costs associated with our products prior to regulatory approval, when, based on management’s judgment, future commercialization is considered probable and the future economic benefit is expected to be realized. We consider numerous attributes in evaluating whether the costs to manufacture a particular product should be capitalized as an asset. We assess the regulatory approval process and where the particular product stands in relation to that approval process, including any known safety or efficacy concerns, potential labeling restrictions and other impediments to approval. We evaluate our anticipated research and development initiatives and constraints relating to the product and the indication in which it will be used. We consider our manufacturing environment including our supply chain in determining logistical constraints that could hamper approval or commercialization. We consider the shelf life of the product in relation to the expected timeline for approval and we consider patent related or contract issues that may prevent or delay commercialization. We also base our judgment on the viability of commercialization, trends in the marketplace and market acceptance criteria. Finally, we consider the reimbursement strategies that may prevail with respect to the product and assess the economic benefit that we are likely to realize. We expense previously capitalized costs related to pre-approval inventory upon a change in such judgment,
due to, among other potential factors, a denial or significant delay of approval by necessary regulatory bodies. All changes in judgment in relation to pre-approval inventory have historically been insignificant.
Acquired Intangible Assets, including In-process Research and Development (IPR&D)
Effective January 1, 2009, when we purchase a business, the acquired IPR&D is measured at fair value, capitalized as an intangible asset and tested for impairment at least annually, as of October 31, until commercialization, after which time the IPR&D is amortized over its estimated useful life. If we acquire an asset or group of assets that do not meet the definition of a business under applicable accounting standards, the acquired IPR&D is expensed on its acquisition date. Future costs to develop these assets are recorded to research and development expense as they are incurred.
We have acquired, and expect to continue to acquire, intangible assets through the acquisition of biotechnology companies or through the consolidation of variable interest entities. These intangible assets primarily consist of technology associated with human therapeutic products and IPR&D product candidates. When significant identifiable intangible assets are acquired, we generally engage an independent third-party valuation firm to assist in determining the fair values of these assets as of the acquisition date. Management will determine the fair value of less significant identifiable intangible assets acquired. Discounted cash flow models are typically used in these valuations, and these models require the use of significant estimates and assumptions including but not limited to:
estimating the timing of and expected costs to complete the in-process projects;
projecting regulatory approvals;
estimating future cash flows from product sales resulting from completed products and in process projects; and
developing appropriate discount rates and probability rates by project.
We believe the fair values assigned to the intangible assets acquired are based upon reasonable estimates and assumptions given available facts and circumstances as of the acquisition dates.


If these projects are not successfully developed, the sales and profitability of the company may be adversely affected in future periods. Additionally, the value of the acquired intangible assets may become impaired. We believe that the foregoing assumptions used in the IPR&D analysis were reasonable at the time of the respective acquisition. No assurance can be given that the underlying assumptions used to estimate expected project sales, development costs or profitability, or the events associated with such projects, will transpire as estimated.
Certain IPR&D programs have a fair value that is not significantly in excess of carrying value, including our program for the treatment of TGN. Such programs could become impaired if assumptions used in determining the fair value change.
Impairment and Amortization of Long-lived Assets and Accounting for Goodwill
Long-lived Assets Other than Goodwill
Long-lived assets to be held and used include property, plant and equipment as well as intangible assets, including IPR&D and trademarks. Property, plant and equipment are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable. We review our intangible assets with indefinite lives for impairment annually, as of October 31, and whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable.
When performing our impairment assessment, we calculate the fair value using the same methodology as described above under "Acquired Intangible Assets, including In-process Research and Development (IPR&D)". If the carrying value of our intangible assets with indefinite lives exceeds its fair value, then the intangible asset is written-down to its fair value.
Our most significant intangible assets are our acquired and in-licensed rights and patents and developed technology. Acquired and in-licensed rights and patents primarily relates to our acquisition of all remaining rights to TYSABRI from Elan. Developed technology primarily relates to our AVONEX product, which was recorded in connection with the merger of Biogen, Inc. and IDEC Pharmaceuticals Corporation in 2003. We amortize the intangible assets related to TYSABRI and AVONEX using the economic consumption method based on revenue generated from the products underlying the related intangible assets. An analysis of the anticipated lifetime revenues of TYSABRI and AVONEX is performed annually during our long range planning cycle, which is generally updated in the third quarter of each year, and whenever events or changes in circumstances
would significantly affect the anticipated lifetime revenues of TYSABRI or AVONEX.
For additional information on the impairment charges related to our long-lived assets during 2016 and 2014, please read Note 6, Intangible Assets and Goodwill to our consolidated financial statements included in this report. Impairment charges related to our long-lived assets during 2015 were insignificant.
Goodwill
Goodwill relates largely to amounts that arose in connection with the merger of Biogen, Inc. and IDEC Pharmaceuticals Corporation in 2003 and amounts that are being paid in connection with the acquisition of Fumapharm AG. Our goodwill balances represent the difference between the purchase price and the fair value of the identifiable tangible and intangible net assets when accounted for using the purchase method of accounting.
We assess our goodwill balance within our single reporting unit annually, as of October 31, and whenever events or changes in circumstances indicate the carrying value of goodwill may not be recoverable to determine whether any impairment in this asset may exist and, if so, the extent of such impairment. We compare the fair value of our reporting unit to its carrying value. If the carrying value of the net assets assigned to the reporting unit exceeds the fair value of our reporting unit, then we would need to determine the implied fair value of our reporting unit’s goodwill. If the carrying value of our reporting unit’s goodwill exceeds its implied fair value, then we would record an impairment loss equal to the difference.
We completed our required annual impairment test in the fourth quarters of 2016, 2015 and 2014, respectively, and determined in each of those periods that the carrying value of goodwill was not impaired. In each year, the fair value of our reporting unit, which includes goodwill, was significantly in excess of the carrying value of our reporting unit.


Investments, including Fair Value Measures and Impairments
We invest in various types of securities, including short-term and long-term marketable securities, principally corporate notes, government securities including government sponsored enterprise mortgage-backed securities and credit card and auto loan asset-backed securities, in which our excess cash balances are invested.
In accordance with the accounting standard for fair value measurements, we have classified our financial assets as Level 1, 2 or 3 within the fair value hierarchy. Fair values determined by Level 1 inputs utilize quoted prices (unadjusted) in active markets for identical assets that we have the ability to access. Fair values determined by Level 2 inputs utilize data points that are observable such as quoted prices, interest rates, yield curves and foreign currency spot rates. Fair values determined by Level 3 inputs utilize unobservable data points for the asset.
As noted in Note 7, Fair Value Measurements to our consolidated financial statements, a majority of our financial assets have been classified as Level 2. These assets have been initially valued at the transaction price and subsequently valued utilizing third-party pricing services. The pricing services use many observable market inputs to determine value, including reportable trades, benchmark yields, credit spreads, broker/dealer quotes, bids, offers, current spot rates and other industry and economic events. We validate the prices provided by our third-party pricing services by understanding the models used, obtaining market values from other pricing sources and analyzing pricing data in certain instances.
Impairment
We conduct periodic reviews to identify and evaluate each investment that has an unrealized loss, in accordance with the meaning of other-than-temporary impairment and its application to certain investments. An unrealized loss exists when the current fair value of an individual security is less than its amortized cost basis. Unrealized losses on available-for-sale debt securities that are determined to be temporary, and not related to credit loss, are recorded, net of tax, in accumulated other comprehensive income.
For available-for-sale debt securities with unrealized losses, management performs an analysis to assess whether we intend to sell or whether we would more likely than not be required to sell the security before the expected recovery of the amortized cost basis. Where we intend to sell a security, or may be required to do so, the security’s decline in fair value is deemed to be other-than-temporary and the full amount of the unrealized loss is reflected within earnings as an impairment loss.
Regardless of our intent to sell a security, we perform additional analysis on all securities with unrealized losses to evaluate losses associated with the creditworthiness of the security. Credit losses are identified where we do not expect to receive cash flows sufficient to recover the amortized cost basis of a security and are reflected within earnings as an impairment loss.
Share-Based Compensation
We make certain assumptions in order to value and record expense associated with awards made under our share-based compensation arrangements. Changes in these assumptions may lead to variability with respect to the amount of expense we recognize in connection with share-based payments.
Determining the appropriate valuation model and related assumptions requires judgment, and includes estimating the expected market price of our stock on vesting date and stock price volatility as well as the term of the expected awards. Determining the appropriate amount to expense based on the anticipated achievement of performance targets requires judgment, including forecasting the achievement of future financial targets. The estimate of expense is revised periodically based on the probability of achieving the required performance targets and adjustments are made throughout the term as appropriate. The cumulative impact of any revision is reflected in the period of change.
We also estimate forfeitures over the requisite service period when recognizing share-based compensation expense based on historical rates and forward-looking factors. These estimates are adjusted to the extent that actual forfeitures differ, or are expected to materially differ, from our estimates.


Contingent Consideration
For acquisitions completed before January 1, 2009, we record contingent consideration resulting from a business combination when the contingency is resolved. For acquisitions completed after January 1, 2009, we record contingent consideration resulting from a business combination at its fair value on the acquisition date. Each reporting period thereafter, we revalue these obligations and record increases or decreases in their fair value as an adjustment to contingent consideration expense in our consolidated statements of income. Changes in the fair value of the contingent consideration obligations can result from changes to one or multiple inputs including adjustments to the discount rates and achievement and timing of any cumulative sales-based and development milestones, or changes in the probability of certain clinical events and changes in the assumed probability associated with regulatory approval. These fair value measurements represent Level 3 measurements as they are based on significant inputs not observable in the market.
Significant judgment is employed in determining the appropriateness of these assumptions as of the acquisition date and for each subsequent period. Accordingly, changes in assumptions described above, could have a material impact on the amount of contingent consideration expense we record in any given period.
Restructuring Charges
We have made estimates and judgments regarding the amount and timing of our restructuring expense and liability, including current and future period termination benefits, pipeline program termination costs and other exit costs to be incurred when related actions take place. Severance and other related costs are reflected in our consolidated statements of income as a component of total restructuring charges incurred. Actual results may differ from these estimates.
Income Taxes
We prepare and file income tax returns based on our interpretation of each jurisdiction’s tax laws and regulations. In preparing our consolidated financial statements, we estimate our income tax liability in each of the jurisdictions in which we operate by estimating our actual current tax expense together with assessing temporary differences resulting from differing treatment of items for tax and financial reporting purposes. These differences result in deferred tax assets and liabilities, which are included in our consolidated balance sheets. Significant management judgment is required in assessing the realizability of our deferred tax assets. In performing this assessment, we consider whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. In making this determination, under the applicable financial accounting standards, we are allowed to consider the scheduled reversal of deferred tax liabilities, projected future taxable income and the effects of tax planning strategies. Our estimates of future taxable income include, among other items, our estimates of future income tax deductions related to the exercise of stock options. In the event that actual results differ from our estimates, we adjust our estimates in future periods and we may need to establish a valuation allowance, which could materially impact our financial position and results of operations.
All tax effects associated with intercompany transfers of assets within our consolidated group, both current and deferred, are recorded as a prepaid tax or deferred charge and recognized through our consolidated statements of income when the asset transferred is sold to a third-party or otherwise recovered through amortization of the asset's remaining economic life. If the asset transferred becomes impaired, for example through the obsolescence of inventory or the discontinuation of a research program, we will expense any remaining deferred charge or prepaid tax. As of December 31, 2016, total deferred charges and prepaid taxes were $989.8 million. For additional information related to the new accounting standard on tax effects associated with intercompany transfers of assets within our consolidated group please read Note 1, Summary of Significant Accounting Policies: New Accounting Pronouncements to our consolidated financial statements included in this report.


We account for uncertain tax positions using a “more-likely-than-not” threshold for recognizing and resolving uncertain tax positions. We evaluate uncertain tax positions on a quarterly basis and consider various factors that include, but are not limited to, changes in tax law, the measurement of tax positions taken or expected to be taken in tax returns, the effective settlement of matters subject to audit, information obtained during in process audit activities and changes in facts or circumstances related to a tax position. We adjust the level of the liability to reflect any subsequent changes in the relevant facts surrounding the uncertain positions. Our liabilities for uncertain tax positions can be relieved only if the contingency becomes legally extinguished, through either payment to the taxing authority or the expiration of the statute of limitations, the recognition of the benefits associated with the position meet the “more-likely-than-not” threshold or the liability becomes effectively settled through the examination process. We consider matters to be effectively settled once the taxing authority has completed all of its required or expected examination procedures, including all appeals and administrative reviews, we have no plans to appeal or litigate any aspect of the tax position, and we believe that it is highly unlikely that the taxing authority would examine or re-examine the related tax position. We also accrue for potential interest and penalties related to unrecognized tax benefits in income tax expense.
We earn a significant amount of our operating income outside the U.S. As a result, a portion of our cash, cash equivalents and marketable securities are held by foreign subsidiaries. We currently do not intend or foresee a need to repatriate these funds. We expect existing domestic cash, cash equivalents, marketable securities and cash flows from operations to continue to be sufficient to fund our domestic operating activities and cash commitments for investing and financing activities for the foreseeable future.
As of December 31, 2016, our non-U.S. subsidiaries’ undistributed foreign earnings included in consolidated retained earnings and other basis differences aggregated to approximately $7.6 billion. All undistributed foreign earnings of non-U.S. subsidiaries, exclusive of earnings that would result in little or no net income tax expense or which were previously taxed under current U.S. tax law, are reinvested indefinitely in operations outside the U.S. This determination is made on a jurisdiction-by-jurisdiction basis and takes into the account the liquidity requirements in both the U.S. and within our foreign subsidiaries. 
If we decide to repatriate funds in the future to execute our growth initiatives or to fund any other liquidity needs, the resulting tax consequences would negatively impact our results of operations through a higher effective tax rate and dilution of our earnings. The residual U.S. tax liability, if cumulative amounts were repatriated, would be between $1.8 billion to $2.3 billion as of December 31, 2016.
New Accounting Standards
For a discussion of new accounting standards please read Note 1, Summary of Significant Accounting Principles to our consolidated financial statements included in this report.
Item 7A.        Quantitative and Qualitative Disclosures About Market Risk
Market RiskShare Repurchase Programs
In July 2016 our Board of Directors authorized a program to repurchase up to $5.0 billion of our common stock (2016 Share Repurchase Program). This authorization does not have an expiration date. Repurchased shares will be retired. During the year ended December 31, 2016, we repurchased and retired 3.3 million shares of common stock at a cost of $1.0 billion under our 2016 Share Repurchase
Program.
In May 2015 our Board of Directors authorized a program to repurchase up to $5.0 billion of our common stock (2015 Share Repurchase Program), which was completed as of December 31, 2015. As of December 31, 2015, we repurchased and retired approximately 16.8 million shares of common stock at a cost of $5.0 billion under our 2015 Share Repurchase Program.
In February 2011 our Board of Directors authorized a program to repurchase up to 20.0 million of our common stock (2011 Share Repurchase Program), which has been used principally to offset common stock issuances under our share-based compensation plans. The 2011 Share Repurchase Program does not have an expiration date. We conductdid not repurchase any shares of common stock under our 2011 Share Repurchase Program during the years ended December 31, 2016 and 2015. During the year ended December 31, 2014, we purchased approximately 2.9 million shares of common stock at a cost of $886.8 million under our 2011 Share Repurchase Program. We have approximately 1.3 million shares remaining available for repurchase under the 2011 Share Repurchase Program.
Cash, Cash Equivalents and Marketable Securities
Until required for another use in our business, globally. Aswe typically invest our cash reserves in bank deposits, certificates of deposit, commercial paper, corporate notes, U.S. and foreign government instruments and other interest bearing marketable debt instruments in accordance with our investment policy. It is our policy to mitigate credit risk in our cash reserves and marketable securities by maintaining a result,well-diversified portfolio that limits the amount of exposure as to institution, maturity and investment type.
The net increase in cash, cash equivalents and marketable securities at December 31, 2016, from December 31, 2015, is primarily due to net cash flows provided by operating activities, partially offset by purchases of our operationscommon stock, payments for income taxes, contingent payments made to former shareholders of Fumapharm AG and holders of their rights, the net purchases of property, plant and equipment and upfront and milestone payments related to our collaboration agreements.


Borrowings
The following is a summary of our principal indebtedness:
$550.0 million aggregate principal amount of 6.875% Senior Notes due March 1, 2018;
$1.5 billion aggregate principal amount of 2.90% Senior Notes due September 15, 2020;
$1.0 billion aggregate principal amount of 3.625% Senior Notes due September 15, 2022;
$1.75 billion aggregate principal amount of 4.05% Senior Notes due September 15, 2025; and
$1.75 billion aggregate principal amount of 5.20% Senior Notes due September 15, 2045.
These senior unsecured notes were issued at a discount and are subject to certain risks which may affect our resultsamortized as additional interest expense over the period from issuance through maturity.
During the third quarter of operations, including volatility in foreign currency exchange rates or weak economic conditions in the foreign markets in2015, we entered into a $1.0 billion, five-year senior unsecured revolving credit facility under which we operate,are permitted to draw funds for working capital and pricing pressures worldwide. general corporate purposes. The terms of the revolving credit facility include a financial covenant that requires us not to exceed a maximum consolidated leverage ratio. As of December 31, 2016, we had no outstanding borrowings and were in compliance with all covenants
under this facility.
In addition,connection with our results2006 distribution agreement with Fumedica AG (Fumedica), we issued notes totaling 61.4 million Swiss Francs that were payable to Fumedica in varying amounts from June 2008 through June 2018. Our remaining note payable to Fumedica had a carrying value of operations6.2 million Swiss Francs ($6.0 million) and 8.9 million Swiss Francs ($9.0 million) as of December 31, 2016 and 2015, respectively.
For a summary of the fair valuevalues of our assetoutstanding borrowings as of December 31, 2016 and liabilities may be impacted by interest rate movements.
Foreign Currency Exchange Risk
Our results of operations are subject to foreign currency exchange rate fluctuations due to the global nature of our operations. We have operations or maintain distribution relationships in the U.S., Europe, Canada, Australia, New Zealand, Japan and Central and South America. In addition, we receive royalty revenues based on worldwide product sales by our licensees and through Genentech on sales of RITUXAN in the rest of world. As a result, our financial position, results of operations and cash flows can be affected by market fluctuations in foreign exchange rates, primarily with respect to the Euro, Canadian dollar, Danish krone, Swiss franc, Japanese yen, Australian dollar and British pound.
While the financial results of our global activities are reported in U.S. dollars, the functional currency for most of our foreign subsidiaries is their respective local currency. Fluctuations in the foreign currency exchange rates of the countries in which we do business will affect our operating results, often in ways that are difficult to predict. In particular, as the U.S. dollar strengthens versus other currencies the value of the non-U.S. revenue will decline when reported in U.S. dollars. The impact to net income as a result of a U.S. dollar strengthening will be partially mitigated by the value of non-U.S. expense which will also decline when reported in U.S. dollars. As the U.S. dollar weakens versus other currencies the value of the non-U.S. revenue and expenses will increase when reported in U.S. dollars.
We have established revenue hedging and balance sheet risk management programs to protect against volatility of future foreign currency cash flows and changes in fair value caused by volatility in foreign exchange rates.
Revenue Hedging Program
Our foreign currency hedging program is designed to mitigate, over time, a portion of the impact resulting from volatility in exchange rate changes on revenues. We use foreign currency forward contracts to manage foreign currency risk with the majority of our forward contracts used to hedge certain forecasted revenue transactions denominated in foreign currencies in the next 15 months. We do not engage in currency speculation. For a more detailed disclosure of our revenue hedging program,2015, please read Note 10,7, Derivative InstrumentsFair Value Measurements to our consolidated financial statements included in this report.
Our abilityWorking Capital
We define working capital as current assets less current liabilities. The increase in working capital at December 31, 2016, from December 31, 2015, reflects an increase in total current assets of $2,031.9 million, partially offset by an increase in current liabilities of $842.2 million. The increase in total current assets was primarily driven by an increase in cash, cash equivalents and marketable securities due to mitigatenet cash flows provided by operating activities. The increase in total current liabilities primarily resulted from litigation settlement and license charges and an increase in accrued collaboration expenses.

Cash Flows
The following table summarizes our cash flow activity:
 
For the Years Ended
December 31,
 % Change
 2016 compared to 2015 2015 compared to 2014
(In millions, except percentages)2016 2015 2014 
Net cash flows provided by operating activities$4,522.4
 $3,716.1
 $2,942.1
 21.7 % 26.3 %
Net cash flows used in by investing activities$(2,484.8) $(4,553.6) $(1,543.0) (45.4)% 195.1 %
Net cash flows provided by (used in) financing activities$(987.8) $986.4
 $(755.9) (200.1)% (230.5)%
Operating Activities
Cash flows from operating activities represent the impactcash receipts and disbursements related to all of exchange rate changes on revenuesour activities other than investing and financing activities. We expect cash provided from operating activities will continue to be our primary source of funds to finance operating needs and capital expenditures for the foreseeable future.
Operating cash flow is derived by adjusting our net income diminishesfor:
Non-cash operating items such as significant exchange rate fluctuationsdepreciation and amortization, impairment charges and share-based compensation charges;
Changes in operating assets and liabilities which reflect timing differences between the receipt and payment of cash associated with transactions and when they are sustained over extended periodsrecognized in results of time. In particular, devaluation or significant deteriorationoperations; and


Changes associated with the fair value of foreign currency exchange rates are difficultcontingent payments associated with our acquisitions of businesses and payments related to mitigatecollaborations.
For 2016 compared to 2015, the increase in cash provided by operating activities was primarily driven by higher net income, non-cash charges for depreciation and likelyamortization, a comparative increase in accrued expenses and other liabilities, partially offset by a comparative increase in accounts receivable.
For 2015 compared to negatively impact earnings. The2014, the increase in cash provided by operating activities was primarily driven by higher net income and accounts receivable collections, partially offset by income tax payments.
Investing Activities
For 2016 compared to 2015, the decrease in net cash flows used in investing activities was primarily due to a decrease in net purchases of marketable securities and cash paid for the acquisition of Convergence in February 2015, partially offset by an increase in the contingent consideration
related to the Fumapharm AG acquisition.
For 2015 compared to 2014, the increase in net cash flows used in investing activities was primarily due to an increase in net purchases of marketable securities, an increase in the total amount of contingent consideration paid to the former shareholders of Fumapharm AG, an increase in purchases of property, plant and equipment and cash paid for the acquisition of Convergence.
Financing Activities
For 2016 compared to 2015, the decrease in net cash flows provided by financing activities was primarily due to the issuance of our senior unsecured notes issued in the third quarter of 2015, partially offset by a decrease in the purchases of common stock.
For 2015 compared to 2014, the change in net cash flows provided by financing activities was primarily due to the issuance of our 2015 Senior Notes, partially offset by an increase in the amount of common stock we repurchased.

Contractual Obligations and Off-Balance Sheet Arrangements
Contractual Obligations
The following table summarizes our contractual obligations as of December 31, 2016, excluding amounts related to uncertain tax positions, funding commitments, contingent development, regulatory and commercial milestone payments, TYSABRI contingent payments and contingent consideration related to our business combinations, as described below.
 Payments Due by Period
(In millions)Total 
Less than
1 Year
 
1 to 3
Years
 
3 to 5
Years
 
After
5 Years
Capital leases (1)$18.7
 $2.0
 $16.7
 $
 $
Non-cancellable operating leases (2), (3)549.5
 66.4
 108.2
 98.4
 276.5
Long-term debt obligations (4)10,281.1
 282.5
 1,055.1
 1,939.7
 7,003.8
Purchase and other obligations (5)1,740.1
 1,598.2
 88.5
 43.9
 9.5
Defined benefit obligation74.5
 
 
 
 74.5
Total contractual obligations$12,663.9
 $1,949.1
 $1,268.5
 $2,082.0
 $7,364.3
(1)
During 2015 we amended our existing lease related to Eisai's oral solid dose products manufacturing facility in RTP, North Carolina, where we manufacture our and Eisai's oral solid dose products. Amounts reflected within the table above include the future contractual commitments. For additional information, please read Note 10, Property, Plant and Equipment to our consolidated financial statements included in this report.
(2)We lease properties and equipment for use in our operations. Amounts reflected within the table above detail future minimum rental commitments under non-cancelable operating leases as of December 31 for each of the periods presented. In addition to the minimum rental commitments, these leases may require us to pay additional amounts for taxes, insurance, maintenance and other operating expenses.


(3)
Obligations are presented net of sublease income expected to be received for the vacated manufacturing facility in Cambridge, MA, the vacated portion of our Weston, Massachusetts facility and other facilities throughout the world. For additional information related to the sublease of the vacated manufacturing facility in Cambridge, MA, please read Note 3, Restructuring, Business Transformation and Other Cost Savings Initiatives to our consolidated financial statements included in this report.
(4)Long-term debt obligations are primarily related to our Senior Notes, including principal and interest payments.
(5)
Purchase and other obligations primarily includes our obligations to purchase direct materials, our obligation of $1.25 billion under the litigation settlement and license agreement with Forward Pharma, $176.3 million in contractual commitments for the construction of a biologics manufacturing facility in Solothurn, Switzerland and $13.6 million related to the fair value of net liabilities on derivative contracts. For additional information on the litigation settlement and license agreement with Forward Pharma please read Note 21, Commitments and Contingencies to our consolidated financial statements included in this report.
TYSABRI Contingent Payments
In 2013 we acquired from these contractsElan full ownership of all remaining rights to TYSABRI that we did not already own or control. Under the terms of the acquisition agreement, we are reportedobligated to make contingent payments to Elan of 18% on annual worldwide net sales up to $2.0 billion and 25% on annual worldwide net sales that exceed $2.0 billion. Royalty payments to Elan and other third parties are recognized as operating activitiescost of sales in our consolidated statements of cash flows.income. Elan was acquired by Perrigo in December 2013. Following that acquisition, we began making these royalty payments to Perrigo.
Balance Sheet Risk Management Hedging ProgramContingent Consideration related to Business Combinations
In connection with our acquisitions of Convergence, Stromedix, Inc. (Stromedix) and Biogen International Neuroscience GmbH (BIN), we agreed to make additional payments based upon the achievement of certain milestone events.
As the acquisitions of Convergence, Stromedix and BIN occurred after January 1, 2009, we record contingent consideration liabilities at their fair value on the acquisition date and revalue these obligations each reporting period. We may pay up to approximately $1.2 billion in remaining milestones
related to these acquisitions. For additional information related to our acquisition of Convergence please read Note 2, Acquisitions, to our consolidated financial statements included in this report.
Fumapharm AG
In 2006 we acquired Fumapharm AG. As part of this acquisition we acquired FUMADERM and TECFIDERA (together, Fumapharm Products). We are required to make contingent payments to former shareholders of Fumapharm AG or holders of their rights based on the attainment of certain cumulative sales levels of Fumapharm Products and the level of total net sales of Fumapharm Products in the prior twelve month period, as defined in the acquisition agreement.
During 2016 we paid $1.2 billion in contingent payments as we reached the $7.0 billion, $8.0 billion, $9.0 billion and $10.0 billion cumulative sales levels related to the Fumapharm Products in the fourth quarter of 2015 and the first, second and third quarters of 2016, respectively, and accrued $300.0 million upon reaching $11.0 billion in total cumulative sales of Fumapharm Products in the fourth quarter of 2016.
We also use forward contractswill owe an additional $300.0 million contingent payment for every additional $1.0 billion in cumulative sales level of Fumapharm Products reached if the prior 12 months sales of the Fumapharm Products exceed $3.0 billion, until such time as the cumulative sales level reaches $20.0 billion, at which time no further contingent payments shall be due. If the prior 12 months sales of Fumapharm Products are less than $3.0 billion, contingent payments remain payable on a decreasing tiered basis. These payments will be accounted for as an increase to mitigategoodwill as incurred, in accordance with the foreign currency exposureaccounting standard applicable to business combinations when we acquired Fumapharm. Any portion of the payment which is tax deductible will be recorded as a reduction to goodwill. Payments are due within 60 days following the end of the quarter in which the applicable cumulative sales level has been reached.
Contingent Development, Regulatory and Commercial Milestone Payments
Based on our development plans as of December 31, 2016, we could make potential future milestone payments to third parties of up to approximately $3.1 billion, including approximately $0.5 billion in development milestones, approximately $0.8 billion in regulatory milestones and approximately $1.8 billion in commercial milestones as part of our various collaborations, including licensing and development programs. Payments under these agreements generally become due and payable


upon achievement of certain development, regulatory or commercial milestones. Because the achievement of these milestones had not occurred as of December 31, 2016, such contingencies have not been recorded in our financial statements. Amounts related to contingent milestone payments are not considered contractual obligations as they are contingent on the successful achievement of certain development, regulatory approval and commercial milestones.
We anticipate that we may pay approximately $157.0 million of milestone payments in 2017, provided various development, regulatory or commercial milestones are achieved.
Other Funding Commitments
As of December 31, 2016, we have several on-going clinical studies in various clinical trial stages. Our most significant clinical trial expenditures are to contract research organizations (CROs). The contracts with CROs are generally cancellable, with notice, at our option. We have recorded accrued expenses of approximately $21.0 million on our consolidated balance sheet items. for expenditures incurred by CROs as of December 31, 2016. We have approximately $500.0 million in cancellable future commitments based on existing CRO contracts as of December 31, 2016.
Tax Related Obligations
We exclude liabilities pertaining to uncertain tax positions from our summary of contractual obligations as we cannot make a reliable estimate of the period of cash settlement with the respective taxing authorities. As of December 31, 2016, we have approximately $47.8 million of net liabilities associated with uncertain tax positions.
Other Off-Balance Sheet Arrangements
We do not have any relationships with entities often referred to as structured finance or special purpose entities that were established for the purpose of facilitating off-balance sheet arrangements. As such, we are not exposed to any financing, liquidity, market or credit risk that could arise if we had engaged in such relationships. We consolidate variable interest entities if we are the primary beneficiary.
Legal Matters
For a discussion of legal matters as of December 31, 2016, please read Note 20, Litigation to our consolidated financial statements included in this report.
Critical Accounting Estimates
The primary objectivepreparation of our balance sheet risk management program isconsolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the U.S. (U.S. GAAP), requires us to mitigatemake estimates, judgments and assumptions that may affect the exposurereported amounts of foreign currency denominated net monetary assets, liabilities, equity, revenues and expenses and related disclosure of foreign affiliates. In these instances,contingent assets and liabilities. On an on-going basis we principally utilize currency forward contracts.evaluate our estimates, judgments and methodologies. We have not elected hedge accountingbase our estimates on historical experience and on various other assumptions that we believe are reasonable, the results of which form the basis for making judgments about the balance sheet related items. The cash flowscarrying values of assets, liabilities and equity and the amount of revenue and expenses. Actual results may differ from these estimates under different assumptions or conditions.
Revenue Recognition and Related Allowances
We recognize revenue when all of the following criteria are met: persuasive evidence of an arrangement exists; delivery has occurred or services have been rendered; our price to the customer is fixed or determinable; and collectability is reasonably assured. For additional information related to the new accounting standard for revenues from contracts with customers please read Note 1, Summary of Significant Accounting Policies: New Accounting Pronouncements to our consolidated financial statements included in this report.
Product Revenues
Revenues from product sales are reported as operating activitiesrecognized when title and risk of loss have passed to the customer, which is typically upon delivery. Product revenues are recorded net of applicable reserves for discounts and allowances. The timing of distributor orders and shipments can cause variability in the consolidated statement of cash flows.earnings.

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Quantitative
Reserves for Discounts and Qualitative Disclosures About Market RiskAllowances
The following quantitative information includesRevenues from product sales are recorded net of reserves established for applicable discounts and allowances, including those associated with the impact of currency movements on forward contracts used in both our revenue and balance sheet hedging programs. As of December 31, 2014 and 2013, a hypothetical adverse 10% movement in foreign currency rates compared to the U.S. dollar across all maturities would result in a hypothetical decrease in the fair value of forward contracts of approximately $160.0 million and $102.0 million, respectively. The estimated fair value change was determined by measuring the impact of the hypothetical exchange rate movement on outstanding forward contracts. Our use of this methodology to quantify the market risk of such instruments is subject to assumptions and actual impact could be significantly different. The quantitative information about market risk is limited because it does not take into account all foreign currency operating transactions.
Interest Rate Risk
Our investment portfolio includes cash equivalents and short-term investments. The fair value of our marketable securities is subject to change as a result of potential changes in market interest rates. The potential change in fair value for interest rate sensitive instruments has been assessed on a hypothetical 100 basis point adverse movement across all maturities. As of December 31, 2014 and 2013, we estimate that such hypothetical adverse 100 basis point movement would result in a hypothetical loss in fair value of approximately $14.5 million and $5.7 million, respectively, to our interest rate sensitive instruments. The fair values of our investments were determined using a combinationimplementation of pricing and duration models.
Pricing Pressure
Governmentsactions in somecertain of the international markets in which we operateoperate. These reserves are based on estimates of the amounts earned or to be claimed on the related sales and are classified as reductions of accounts receivable (if the amount is payable to our customer) or a liability (if the amount is payable to a party other than our customer). Our estimates take into consideration our historical experience, current contractual and statutory requirements, specific known market events and trends, industry data and forecasted customer buying and payment patterns. Actual amounts may ultimately differ from our estimates. If actual results vary, we adjust these estimates, which could have implemented measures aimed at reducing healthcare costs to constrainan effect on earnings in the overall levelperiod of government expenditures. These implemented measures vary by country and include, among other things, mandatory rebates and discounts, prospective and possible retroactive price reductions and suspensions on pricing increases on pharmaceuticals.adjustment.
In addition certain countries set prices by reference to the pricesdiscounts and rebates described above and classified as a reduction of revenue, we also maintain certain customer service contracts with distributors and other customers in other countries wherethe distribution channel that provide us with inventory management, data and distribution services, which are generally reflected as a reduction of revenue. To the extent we can demonstrate a separable benefit and fair value for these services, we classify these payments within selling, general and administrative expenses.
Revenues from Anti-CD20 Therapeutic Programs
Revenues from anti-CD20 therapeutic programs consist of:
(i) our share of pre-tax profits and losses in the U.S. for RITUXAN and GAZYVA;
(ii)  reimbursement of our productsselling and development expenses in the U.S. for RITUXAN; and
(iii)revenues on sales in the rest of world for RITUXAN, which consist of our share of pre-tax co-promotion profits on RITUXAN in Canada and royalty revenue on RITUXAN sales outside the U.S. and Canada by the Roche Group and its sublicensees.
Pre-tax co-promotion profits on RITUXAN and GAZYVA are marketed. Thus,calculated and paid to us by Genentech in the U.S. Pre-tax co-promotion profits on RITUXAN are calculated and paid to us by the Roche Group in Canada. Pre-tax co-promotion profits consist of U.S. and Canadian net sales to third-party customers less applicable costs to manufacture, third-party royalty expenses, distribution, selling and marketing expenses, and joint development expenses incurred by Genentech, the Roche Group and us. We record our inability to secure adequate pricesshare of the pre-tax co-promotion profits on RITUXAN in Canada and royalty revenues on RITUXAN sales outside the U.S. on a particular country may impair ourcash basis as we do not have the ability to obtain acceptable prices in existing and potential new markets and limit market growth. The continued implementation of pricing actions throughout Europe may also lead to higher levels of parallel trade.
In the U.S., federal and state legislatures, health agencies and third-party payors continue to focus on containing the cost of health care. Legislative and regulatory proposals and enactments to reform health care insurance programs could significantly influence the manner in which our products are prescribed and purchased. It is possible that additional federal health care reform measures will be adoptedestimate these profits or royalty revenue in the future, which could resultperiod incurred. Our share of the pre-tax profits on RITUXAN and GAZYVA in increased pricing pressurethe U.S. includes estimates made by Genentech and reduced reimbursement for our products and otherwise have an adverse impact on our financial position or results of operations.
There is also significant economic pressure on state budgets that may result in states increasingly seeking to achieve budget savings through mechanisms that limit coverage or payment for our drugs. Managed care organizations are also continuing to seek price discounts and, in some cases, to impose restrictions on the coverage of particular drugs.
Credit Risk
Wethose estimates are subject to credit riskchange. Actual results may differ from our accounts receivable related to our product sales. estimates.
Concentrations of Credit Risk
The majority of our accounts receivable arise from product sales in the U.S. and Europe with concentrations of credit risk limited due to the wide variety of customers and markets using our products, as well as their dispersion across many different geographic areas. Our accounts receivable are primarily due from wholesale distributors, public hospitals and other government entities. We monitor the financial performance and creditworthiness of our large customers so that we can properly assess and respond to changes in their credit profile. We operate in certain countries where weakness in economic conditions has resulted in extended collection periods. We continue to monitor these conditions, including the volatility associated with international economies and the relevant financial markets, and assess their possible impact on our business. Our historical write-offs of accounts receivable have not been significant.
WithinCredit and economic conditions in the European Union,E.U. continue to remain uncertain, which has, from time to time, led to longer collection periods for our accounts receivable and greater collection risk in Spain, Italy and Portugalcertain countries.
Where our collections continue to be subject to significant payment delays due to government funding and reimbursement practices. Uncertain creditpractices and a portion of these receivables are routinely being collected beyond our contractual payment terms and over periods in excess of one year, we have discounted our receivables and reduced related revenues based on the period of time that we estimate those amounts will be paid, to the extent such period exceeds one year, using the country’s market-based borrowing rate for such period. The related receivables are classified at the time of sale as non-current assets.
To date, we have not experienced any significant losses with respect to the collection of our accounts receivable. If economic conditions have generally ledworsen and/or the financial condition of our customers were to greater collectionfurther deteriorate, our risk although these countries have introduced various programs periodicallyof collectability may increase, which may result in additional allowances and/or significant bad debts.


For additional information related to pay down significantly overdue payables. Please referour concentration of credit risk associated with our accounts receivable balances, please read the subsection entitled “Credit Risk” in the “Quantitative and Qualitative Disclosures About Market Risk” section of this report.
Collaborative and Other Relationships
Our development and commercialization arrangements with Sobi and AbbVie represent collaborative arrangements as each party is an active participant and exposed to significant risks and rewards of the arrangements. Where we are the principal on sales transactions with third parties, we recognize revenue, cost of sales and sales and marketing expenses on a gross basis in their respective lines in our consolidated statements of income. Where we are not the principal on sales transactions with third parties, we record our share of the revenues, cost of sales and sales and marketing expenses on a net basis in collaborative and other relationships in our consolidated statements of income.
For additional information related to our collaborations with Sobi and AbbVie, please read Note 4,19, Accounts ReceivableCollaborative and Other Relationships to ourthese consolidated financial statements included within this reportstatements.
Capitalization of Inventory Costs
We capitalize inventory costs associated with our products prior to regulatory approval, when, based on management’s judgment, future commercialization is considered probable and the future economic benefit is expected to be realized. We consider numerous attributes in evaluating whether the costs to manufacture a particular product should be capitalized as an asset. We assess the regulatory approval process and where the particular product stands in relation to that approval process, including any known safety or efficacy concerns, potential labeling restrictions and other impediments to approval. We evaluate our anticipated research and development initiatives and constraints relating to the product and the indication in which it will be used. We consider our manufacturing environment including our supply chain in determining logistical constraints that could hamper approval or commercialization. We consider the shelf life of the product in relation to the expected timeline for further detailsapproval and we consider patent related or contract issues that may prevent or delay commercialization. We also base our judgment on recent paymentsthe viability of commercialization, trends in the marketplace and classification.market acceptance criteria. Finally, we consider the reimbursement strategies that may prevail with respect to the product and assess the economic benefit that we are likely to realize. We expense previously capitalized costs related to pre-approval inventory upon a change in such judgment,

52

Tabledue to, among other potential factors, a denial or significant delay of Contentsapproval by necessary regulatory bodies. All changes in judgment in relation to pre-approval inventory have historically been insignificant.
Acquired Intangible Assets, including In-process Research and Development (IPR&D)
Effective January 1, 2009, when we purchase a business, the acquired IPR&D is measured at fair value, capitalized as an intangible asset and tested for impairment at least annually, as of October 31, until commercialization, after which time the IPR&D is amortized over its estimated useful life. If we acquire an asset or group of assets that do not meet the definition of a business under applicable accounting standards, the acquired IPR&D is expensed on its acquisition date. Future costs to develop these assets are recorded to research and development expense as they are incurred.
We have acquired, and expect to continue to acquire, intangible assets through the acquisition of biotechnology companies or through the consolidation of variable interest entities. These intangible assets primarily consist of technology associated with human therapeutic products and IPR&D product candidates. When significant identifiable intangible assets are acquired, we generally engage an independent third-party valuation firm to assist in determining the fair values of these assets as of the acquisition date. Management will determine the fair value of less significant identifiable intangible assets acquired. Discounted cash flow models are typically used in these valuations, and these models require the use of significant estimates and assumptions including but not limited to:
estimating the timing of and expected costs to complete the in-process projects;
projecting regulatory approvals;
estimating future cash flows from product sales resulting from completed products and in process projects; and
developing appropriate discount rates and probability rates by project.
We believe the fair values assigned to the intangible assets acquired are based upon reasonable estimates and assumptions given available facts and circumstances as of the acquisition dates.


If these projects are not successfully developed, the sales and profitability of the company may be adversely affected in future periods. Additionally, the value of the acquired intangible assets may become impaired. We believe that our allowance for doubtful accounts was adequate as of December 31, 2014 and 2013, respectively. However, if significant changes occurthe foregoing assumptions used in the availabilityIPR&D analysis were reasonable at the time of government fundingthe respective acquisition. No assurance can be given that the underlying assumptions used to estimate expected project sales, development costs or profitability, or the reimbursement practicesevents associated with such projects, will transpire as estimated.
Certain IPR&D programs have a fair value that is not significantly in excess of thesecarrying value, including our program for the treatment of TGN. Such programs could become impaired if assumptions used in determining the fair value change.
Impairment and Amortization of Long-lived Assets and Accounting for Goodwill
Long-lived Assets Other than Goodwill
Long-lived assets to be held and used include property, plant and equipment as well as intangible assets, including IPR&D and trademarks. Property, plant and equipment are reviewed for impairment whenever events or other governments, wechanges in circumstances indicate that the carrying amount of the assets may not be ablerecoverable. We review our intangible assets with indefinite lives for impairment annually, as of October 31, and whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable.
When performing our impairment assessment, we calculate the fair value using the same methodology as described above under "Acquired Intangible Assets, including In-process Research and Development (IPR&D)". If the carrying value of our intangible assets with indefinite lives exceeds its fair value, then the intangible asset is written-down to collect on amounts due to us from customers in such countries and our results of operations could be adversely affected.its fair value.
Financial Condition, Liquidity and Capital Resources
Our financial condition is summarized as follows:
 As of December 31, % Change
(In millions, except percentages)2014 2013 2014 compared to 2013
Financial assets:     
Cash and cash equivalents$1,204.9
 $602.6
 100.0 %
Marketable securities — current640.5
 620.2
 3.3 %
Marketable securities — non-current1,470.7
 625.8
 135.0 %
Total cash, cash equivalents and marketable securities$3,316.0
 $1,848.5
 79.4 %
Borrowings:     
Current portion of notes payable$3.1
 $3.5
 (10.2)%
Notes payable582.1
 592.4
 (1.8)%
Total borrowings$585.2
 $595.9
 (1.8)%
Working Capital:     
Current assets$4,672.7
 $3,184.9
 46.7 %
Current liabilities(2,219.7) (1,758.3) 26.2 %
Total working capital$2,453.0
 $1,426.6
 71.9 %
For the year ended December 31, 2014, certainmost significant cash flows were as follows:
$1,163.2 million in total payments for income taxes;
$886.8 million used for share repurchases;
$375.0 million in contingent payments madeintangible assets are our acquired and in-licensed rights and patents and developed technology. Acquired and in-licensed rights and patents primarily relates to former shareholders of Fumapharm AG and holders of their rights;
$287.8 million used for purchases of property, plant and equipment; and
$286.3 million used for upfront and milestone payments in collaborative arrangements.
For the year ended December 31, 2013, certain significant cash flows were as follows:
$3.25 billion used for our acquisition of all remaining rights to TYSABRI from Elan;Elan. Developed technology primarily relates to our AVONEX product, which was recorded in connection with the merger of Biogen, Inc. and IDEC Pharmaceuticals Corporation in 2003. We amortize the intangible assets related to TYSABRI and AVONEX using the economic consumption method based on revenue generated from the products underlying the related intangible assets. An analysis of the anticipated lifetime revenues of TYSABRI and AVONEX is performed annually during our long range planning cycle, which is generally updated in the third quarter of each year, and whenever events or changes in circumstances
$643.2 million
would significantly affect the anticipated lifetime revenues of TYSABRI or AVONEX.
For additional information on the impairment charges related to our long-lived assets during 2016 and 2014, please read Note 6, Intangible Assets and Goodwill to our consolidated financial statements included in total paymentsthis report. Impairment charges related to our long-lived assets during 2015 were insignificant.
Goodwill
Goodwill relates largely to amounts that arose in connection with the merger of Biogen, Inc. and IDEC Pharmaceuticals Corporation in 2003 and amounts that are being paid in connection with the acquisition of Fumapharm AG. Our goodwill balances represent the difference between the purchase price and the fair value of the identifiable tangible and intangible net assets when accounted for income taxes;using the purchase method of accounting.
$450.0 million usedWe assess our goodwill balance within our single reporting unit annually, as of October 31, and whenever events or changes in circumstances indicate the carrying value of goodwill may not be recoverable to determine whether any impairment in this asset may exist and, if so, the extent of such impairment. We compare the fair value of our reporting unit to its carrying value. If the carrying value of the net assets assigned to the reporting unit exceeds the fair value of our reporting unit, then we would need to determine the implied fair value of our reporting unit’s goodwill. If the carrying value of our reporting unit’s goodwill exceeds its implied fair value, then we would record an impairment loss equal to the difference.
We completed our required annual impairment test in the fourth quarters of 2016, 2015 and 2014, respectively, and determined in each of those periods that the carrying value of goodwill was not impaired. In each year, the fair value of our reporting unit, which includes goodwill, was significantly in excess of the carrying value of our reporting unit.


Investments, including Fair Value Measures and Impairments
We invest in various types of securities, including short-term and long-term marketable securities, principally corporate notes, government securities including government sponsored enterprise mortgage-backed securities and credit card and auto loan asset-backed securities, in which our excess cash balances are invested.
In accordance with the accounting standard for fair value measurements, we have classified our financial assets as Level 1, 2 or 3 within the fair value hierarchy. Fair values determined by Level 1 inputs utilize quoted prices (unadjusted) in active markets for identical assets that we have the ability to access. Fair values determined by Level 2 inputs utilize data points that are observable such as quoted prices, interest rates, yield curves and foreign currency spot rates. Fair values determined by Level 3 inputs utilize unobservable data points for the repayment of principalasset.
As noted in Note 7, Fair Value Measurements to our consolidated financial statements, a majority of our 6.0% Senior Notes;financial assets have been classified as Level 2. These assets have been initially valued at the transaction price and subsequently valued utilizing third-party pricing services. The pricing services use many observable market inputs to determine value, including reportable trades, benchmark yields, credit spreads, broker/dealer quotes, bids, offers, current spot rates and other industry and economic events. We validate the prices provided by our third-party pricing services by understanding the models used, obtaining market values from other pricing sources and analyzing pricing data in certain instances.
$400.3 million usedImpairment
We conduct periodic reviews to identify and evaluate each investment that has an unrealized loss, in accordance with the meaning of other-than-temporary impairment and its application to certain investments. An unrealized loss exists when the current fair value of an individual security is less than its amortized cost basis. Unrealized losses on available-for-sale debt securities that are determined to be temporary, and not related to credit loss, are recorded, net of tax, in accumulated other comprehensive income.
For available-for-sale debt securities with unrealized losses, management performs an analysis to assess whether we intend to sell or whether we would more likely than not be required to sell the security before the expected recovery of the amortized cost basis. Where we intend to sell a security, or may be required to do so, the security’s decline in fair value is deemed to be other-than-temporary and the full amount of the unrealized loss is reflected within earnings as an impairment loss.
Regardless of our intent to sell a security, we perform additional analysis on all securities with unrealized losses to evaluate losses associated with the creditworthiness of the security. Credit losses are identified where we do not expect to receive cash flows sufficient to recover the amortized cost basis of a security and are reflected within earnings as an impairment loss.
Share-Based Compensation
We make certain assumptions in order to value and record expense associated with awards made under our share-based compensation arrangements. Changes in these assumptions may lead to variability with respect to the amount of expense we recognize in connection with share-based payments.
Determining the appropriate valuation model and related assumptions requires judgment, and includes estimating the expected market price of our stock on vesting date and stock price volatility as well as the term of the expected awards. Determining the appropriate amount to expense based on the anticipated achievement of performance targets requires judgment, including forecasting the achievement of future financial targets. The estimate of expense is revised periodically based on the probability of achieving the required performance targets and adjustments are made throughout the term as appropriate. The cumulative impact of any revision is reflected in the period of change.
We also estimate forfeitures over the requisite service period when recognizing share-based compensation expense based on historical rates and forward-looking factors. These estimates are adjusted to the extent that actual forfeitures differ, or are expected to materially differ, from our estimates.


Contingent Consideration
For acquisitions completed before January 1, 2009, we record contingent consideration resulting from a business combination when the contingency is resolved. For acquisitions completed after January 1, 2009, we record contingent consideration resulting from a business combination at its fair value on the acquisition date. Each reporting period thereafter, we revalue these obligations and record increases or decreases in their fair value as an adjustment to contingent consideration expense in our consolidated statements of income. Changes in the fair value of the contingent consideration obligations can result from changes to one or multiple inputs including adjustments to the discount rates and achievement and timing of any cumulative sales-based and development milestones, or changes in the probability of certain clinical events and changes in the assumed probability associated with regulatory approval. These fair value measurements represent Level 3 measurements as they are based on significant inputs not observable in the market.
Significant judgment is employed in determining the appropriateness of these assumptions as of the acquisition date and for share repurchases;each subsequent period. Accordingly, changes in assumptions described above, could have a material impact on the amount of contingent consideration expense we record in any given period.
$246.3 million used for purchases of property, plant and equipment; and
$100.0 million upfront payment made to Isis pursuant to our collaboration agreement dated September 2013.Restructuring Charges
We have historically financedmade estimates and judgments regarding the amount and timing of our restructuring expense and liability, including current and future period termination benefits, pipeline program termination costs and other exit costs to be incurred when related actions take place. Severance and other related costs are reflected in our consolidated statements of income as a component of total restructuring charges incurred. Actual results may differ from these estimates.
Income Taxes
We prepare and file income tax returns based on our interpretation of each jurisdiction’s tax laws and regulations. In preparing our consolidated financial statements, we estimate our income tax liability in each of the jurisdictions in which we operate by estimating our actual current tax expense together with assessing temporary differences resulting from differing treatment of items for tax and financial reporting purposes. These differences result in deferred tax assets and liabilities, which are included in our consolidated balance sheets. Significant management judgment is required in assessing the realizability of our deferred tax assets. In performing this assessment, we consider whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. In making this determination, under the applicable financial accounting standards, we are allowed to consider the scheduled reversal of deferred tax liabilities, projected future taxable income and the effects of tax planning strategies. Our estimates of future taxable income include, among other items, our estimates of future income tax deductions related to the exercise of stock options. In the event that actual results differ from our estimates, we adjust our estimates in future periods and we may need to establish a valuation allowance, which could materially impact our financial position and results of operations.
All tax effects associated with intercompany transfers of assets within our consolidated group, both current and deferred, are recorded as a prepaid tax or deferred charge and recognized through our consolidated statements of income when the asset transferred is sold to a third-party or otherwise recovered through amortization of the asset's remaining economic life. If the asset transferred becomes impaired, for example through the obsolescence of inventory or the discontinuation of a research program, we will expense any remaining deferred charge or prepaid tax. As of December 31, 2016, total deferred charges and prepaid taxes were $989.8 million. For additional information related to the new accounting standard on tax effects associated with intercompany transfers of assets within our consolidated group please read Note 1, Summary of Significant Accounting Policies: New Accounting Pronouncements to our consolidated financial statements included in this report.


We account for uncertain tax positions using a “more-likely-than-not” threshold for recognizing and resolving uncertain tax positions. We evaluate uncertain tax positions on a quarterly basis and consider various factors that include, but are not limited to, changes in tax law, the measurement of tax positions taken or expected to be taken in tax returns, the effective settlement of matters subject to audit, information obtained during in process audit activities and changes in facts or circumstances related to a tax position. We adjust the level of the liability to reflect any subsequent changes in the relevant facts surrounding the uncertain positions. Our liabilities for uncertain tax positions can be relieved only if the contingency becomes legally extinguished, through either payment to the taxing authority or the expiration of the statute of limitations, the recognition of the benefits associated with the position meet the “more-likely-than-not” threshold or the liability becomes effectively settled through the examination process. We consider matters to be effectively settled once the taxing authority has completed all of its required or expected examination procedures, including all appeals and administrative reviews, we have no plans to appeal or litigate any aspect of the tax position, and we believe that it is highly unlikely that the taxing authority would examine or re-examine the related tax position. We also accrue for potential interest and penalties related to unrecognized tax benefits in income tax expense.
We earn a significant amount of our operating income outside the U.S. As a result, a portion of our cash, cash equivalents and capital expenditures primarily through cash flows earned through our operations.marketable securities are held by foreign subsidiaries. We currently do not intend or foresee a need to repatriate these funds. We expect to continue funding our currentexisting domestic cash, cash equivalents, marketable securities and planned operating requirements principally through our cash flows from operations as well as our existing cash resources. We believe that our existing funds, when combined with cash generated from operations and our access to additional financing resources, if needed, arecontinue to be sufficient to satisfyfund our domestic operating working capital, strategic alliance, milestone payment, capital expenditureactivities and debt service requirementscash commitments for investing and financing activities for the foreseeable future. In addition, we may choose
As of December 31, 2016, our non-U.S. subsidiaries’ undistributed foreign earnings included in consolidated retained earnings and other basis differences aggregated to opportunistically return cash to shareholders and pursue other business initiatives, including acquisition and licensing activities. We may, from time to time, also seek additional funding through a combination of new

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collaborative agreements, strategic alliances and additional equity and debt financings or from other sources should we identify a significant new opportunity.
Theapproximately $7.6 billion. All undistributed cumulative foreign earnings of certain of our foreignnon-U.S. subsidiaries, exclusive of earnings that would result in little or no net income tax expense or which were previously taxed under current U.S. tax law, or which has already been subject to tax under U.S. tax law, are investedreinvested indefinitely in operations outside the U.S.
Of This determination is made on a jurisdiction-by-jurisdiction basis and takes into the total cash, cash equivalentsaccount the liquidity requirements in both the U.S. and marketable securities at December 31, 2014, approximately $1,755 million was generated in foreign jurisdictions and is primarily intended for use inwithin our foreign operations or in connection with business development transactions outside of the U.S. In managing our day-to-day liquiditysubsidiaries. 
If we decide to repatriate funds in the U.S., we do not rely onfuture to execute our growth initiatives or to fund any other liquidity needs, the unrepatriated earnings as a source of funds and we have not provided for U.S. federal or state income taxes on these undistributed foreign earnings.
For additional information related to certain risks that couldresulting tax consequences would negatively impact our financial position or future results of operations through a higher effective tax rate and dilution of our earnings. The residual U.S. tax liability, if cumulative amounts were repatriated, would be between $1.8 billion to $2.3 billion as of December 31, 2016.
New Accounting Standards
For a discussion of new accounting standards please read the “Note 1, Risk FactorsSummary of Significant Accounting Principles” and “ to our consolidated financial statements included in this report.
Item 7A.        Quantitative and Qualitative Disclosures About Market Risk” sections of this report.
Share Repurchase Programs
In July 2016 our Board of Directors authorized a program to repurchase up to $5.0 billion of our common stock (2016 Share Repurchase Program). This authorization does not have an expiration date. Repurchased shares will be retired. During the year ended December 31, 2016, we repurchased and retired 3.3 million shares of common stock at a cost of $1.0 billion under our 2016 Share Repurchase
Program.
In May 2015 our Board of Directors authorized a program to repurchase up to $5.0 billion of our common stock (2015 Share Repurchase Program), which was completed as of December 31, 2015. As of December 31, 2015, we repurchased and retired approximately 16.8 million shares of common stock at a cost of $5.0 billion under our 2015 Share Repurchase Program.
In February 2011 our Board of Directors authorized thea program to repurchase of up to 20.0 million shares of our common stock. This authorizationstock (2011 Share Repurchase Program), which has been used principally to offset common stock issuances under our share-based compensation plans. The 2011 Share Repurchase Program does not have an expiration date. In We did not repurchase any shares of common stock under our 2011 Share Repurchase Program during the years ended December 31, 2016 and 2015. During the year ended December 31, 2014,, we purchased approximately 2.9 million shares were repurchasedof common stock at a cost of $886.8$886.8 million. As of December 31, 2014, under our 2011 Share Repurchase Program. We have approximately 1.3 million shares of our common stock remainedremaining available for repurchase under the 2011 authorization.
We repurchased approximately 2.0 million shares at a cost of approximately $400.3 million under the 2011 authorization in 2013.Share Repurchase Program.
Cash, Cash Equivalents and Marketable Securities
Until required for another use in our business, we typically invest our cash reserves in bank deposits, certificates of deposit, commercial paper, corporate notes, U.S. and foreign government instruments and other interest bearing marketable debt instruments in accordance with our investment policy. It is our policy to mitigate credit risk in our cash reserves and marketable securities by maintaining a well-diversified portfolio that limits the amount of exposure as to institution, maturity and investment type. We also limit our exposure to European sovereign debt securities and maintain no holdings with respect to certain euro-zone states, such as Portugal, Italy and Spain.
The value of our investments, however, may be adversely affected by increases in interest rates, downgrades in the credit rating of the corporate bonds included in our portfolio, instability in the global financial markets that reduces the liquidity of securities included in our portfolio, and by other factors which may result in declines in the value of the investments. Each of these events may cause us to record charges to reduce the carrying value of our investment portfolio if the declines are other-than-temporary or sell investments for less than our acquisition cost which could adversely impact our financial position and our overall liquidity.
Thenet increase in cash, cash equivalents and marketable securities from at December 31, 20132016, from December 31, 2015, is primarily due to net cash flows provided by operating activities, partially offset by the repurchasepurchases of our common stock.stock, payments for income taxes, contingent payments made to former shareholders of Fumapharm AG and holders of their rights, the net purchases of property, plant and equipment and upfront and milestone payments related to our collaboration agreements.


Borrowings
In March 2014,The following is a summary of our $750.0 million senior unsecured revolving credit facility expired and was not renewed.principal indebtedness:
We have
$550.0 million aggregate principal amount of 6.875% Senior Notes due March 1, 2018 that2018;
$1.5 billion aggregate principal amount of 2.90% Senior Notes due September 15, 2020;
$1.0 billion aggregate principal amount of 3.625% Senior Notes due September 15, 2022;
$1.75 billion aggregate principal amount of 4.05% Senior Notes due September 15, 2025; and
$1.75 billion aggregate principal amount of 5.20% Senior Notes due September 15, 2045.
These senior unsecured notes were originally pricedissued at 99.184% of par. Thea discount isand are amortized as additional interest expense over the period from issuance through maturity.
During the third quarter of 2015, we entered into a $1.0 billion, five-year senior unsecured revolving credit facility under which we are permitted to draw funds for working capital and general corporate purposes. The terms of the revolving credit facility include a financial covenant that requires us not to exceed a maximum consolidated leverage ratio. As of December 31, 2016, we had no outstanding borrowings and were in compliance with all covenants
under this facility.
In connection with our 2006 distribution agreement with Fumedica AG (Fumedica), we issued notes totaling 61.4 million Swiss Francs whichthat were payable to Fumedica in varying amounts from June 2008 through June 2018. Our remaining note payable to Fumedica had a carrying value of 11.66.2 million Swiss Francs ($11.7($6.0 million) and 8.9 million) and 14.0 million Swiss Francs ($15.8 million)($9.0 million) as of December 31, 20142016 and 2013,2015, respectively.
For a summary of the fair and carrying values of our outstanding borrowings as of December 31, 20142016 and 2013,2015, please read Note 8,7, Fair Value Measurements to our consolidated financial statements included in this report.

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Working Capital
We define working capital as current assets less current liabilities. The increase in working capital from at December 31, 20132016, from December 31, 2015, reflects an increase in total current assets of $1,487.8$2,031.9 million, partially offset by an increase in total current liabilities of $461.4$842.2 million. The increase in total current assets was primarily driven by an increase in cash, and cash equivalents and accounts receivable resulting from increased product revenue.marketable securities due to net cash flows provided by operating activities. The increase in total current liabilities primarily resulted from litigation settlement and license charges and an increase in accrued expenses and other.collaboration expenses.

Cash Flows
The following table summarizes our cash flow activity:
For the Years Ended
December 31,
 % Change
For the Years Ended
December 31,
 % Change
2014 compared to 2013 2013 compared to 20122016 compared to 2015 2015 compared to 2014
(In millions, except percentages)2014 2013 2012 2016 2015 2014 
Net cash flows provided by operating activities$2,942.1
 $2,345.1
 $1,879.9
 25.5 % 24.7 %$4,522.4
 $3,716.1
 $2,942.1
 21.7 % 26.3 %
Net cash flows used in by investing activities$(1,543.0) $(1,604.7) $(950.3) (3.8)% 68.9 %$(2,484.8) $(4,553.6) $(1,543.0) (45.4)% 195.1 %
Net cash flows used in financing activities$(755.9) $(716.5) $(877.5) 5.5 % (18.3)%
Net cash flows provided by (used in) financing activities$(987.8) $986.4
 $(755.9) (200.1)% (230.5)%
Operating Activities
Cash flows from operating activities represent the cash receipts and disbursements related to all of our activities other than investing and financing activities. We expect cash provided from operating activities will continue to be our primary source of funds to finance operating needs and capital expenditures for the foreseeable future.
Operating cash flow is derived by adjusting our net income for:
Non-cash operating items such as depreciation and amortization, impairment charges and share-based compensation charges;
Changes in operating assets and liabilities which reflect timing differences between the receipt and payment of cash associated with transactions and when they are recognized in results of operations; and


Changes associated with the fair value of contingent milestonespayments associated with our acquisitions of businesses and payments related to collaborations.
For 20142016 compared to 2013, the increase in cash provided by operating activities is primarily driven by higher net income, partially offset by an increase in accounts receivable resulting from increased product revenue
For 2013 compared to 2012,2015, the increase in cash provided by operating activities was primarily driven by anhigher net income, non-cash charges for depreciation and amortization, a comparative increase in accrued expenses and other liabilities, partially offset by a comparative increase in accounts receivable.
For 2015 compared to 2014, the increase in cash provided by operating activities was primarily driven by higher net income and taxes payable,accounts receivable collections, partially offset by an increase in inventory related to our AVONEX, TYSABRI and ELOCTATE programs and accounts receivable resulting from increased product revenue.income tax payments.
Investing Activities
For 20142016 compared to 2013,2015, the decrease in net cash flows used in investing activities iswas primarily due to the prior year acquisition of all remaining rights to TYSABRI from Elan and a decrease in the net purchases of marketable securities and cash paid for the acquisition of Convergence in February 2015, partially offset by an increase in the payment of contingent consideration
related to former shareholders ofthe Fumapharm AG.AG acquisition.
For 20132015 compared to 2012,2014, the increase in net cash flows used in investing activities was primarily due to $3,262.7 million usedan increase in net purchases of marketable securities, an increase in the total amount of contingent consideration paid to the former shareholders of Fumapharm AG, an increase in purchases of property, plant and equipment and cash paid for ourthe acquisition of all remaining rights to TYSABRI from Elan, partially offset by net proceeds from sales and maturities of marketable securities.Convergence.
Financing Activities
For 20142016 compared to 2013,2015, the increasedecrease in net cash flows used inprovided by financing activities iswas primarily due to the issuance of our senior unsecured notes issued in the third quarter of 2015, partially offset by a decrease in the purchases of common stock.
For 2015 compared to 2014, the change in net cash flows provided by financing activities was primarily due to the issuance of our 2015 Senior Notes, partially offset by an increase in the amount of common stock we repurchased, partially offset by the prior year repayment of the aggregate principal amount of our 6.0% Senior Notes.repurchased.
For 2013 compared to 2012, the decrease in net cash flows used in financing activities was primarily due to a decrease in the amount of our common stock we repurchased partially offset by the repayment of principal of our 6.0% Senior Notes.

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Contractual Obligations and Off-Balance Sheet Arrangements
Contractual Obligations
The following table summarizes our contractual obligations as of December 31, 2014,2016, excluding amounts related to uncertain tax positions, amounts payable to tax authorities, funding commitments, contingent development, regulatory and commercial milestone payments, TYSABRI contingent payments and contingent consideration related to our business combinations, as described below.
Payments Due by PeriodPayments Due by Period
(In millions)Total 
Less than
1 Year
 
1 to 3
Years
 
3 to 5
Years
 
After
5 Years
Total 
Less than
1 Year
 
1 to 3
Years
 
3 to 5
Years
 
After
5 Years
Non-cancellable operating leases (1), (2)$675.7
 $62.2
 $129.4
 $108.0
 $376.1
Notes payable (3)681.5
 40.9
 81.4
 559.2
 
Purchase and other obligations (4)248.9
 238.6
 10.3
 
 
Capital leases (1)$18.7
 $2.0
 $16.7
 $
 $
Non-cancellable operating leases (2), (3)549.5
 66.4
 108.2
 98.4
 276.5
Long-term debt obligations (4)10,281.1
 282.5
 1,055.1
 1,939.7
 7,003.8
Purchase and other obligations (5)1,740.1
 1,598.2
 88.5
 43.9
 9.5
Defined benefit obligation56.7
 
 
 
 56.7
74.5
 
 
 
 74.5
Total contractual obligations$1,662.8
 $341.7
 $221.1
 $667.2
 $432.8
$12,663.9
 $1,949.1
 $1,268.5
 $2,082.0
 $7,364.3
(1)
During 2015 we amended our existing lease related to Eisai's oral solid dose products manufacturing facility in RTP, North Carolina, where we manufacture our and Eisai's oral solid dose products. Amounts reflected within the table above include the future contractual commitments. For additional information, please read Note 10, Property, Plant and Equipment to our consolidated financial statements included in this report.
(2)We lease properties and equipment for use in our operations. Amounts reflected within the table above detail future minimum rental commitments under non-cancelable operating leases as of December 31 for each of the periods presented. In addition to the minimum rental commitments, these leases may require us to pay additional amounts for taxes, insurance, maintenance and other operating expenses.


(2)(3)
Obligations are presented net of sublease income expected to be received for the vacated manufacturing facility in Cambridge, MA, the vacated portion of our Weston, Massachusetts facility.facility and other facilities throughout the world. For additional information related to the sublease of the vacated manufacturing facility in Cambridge, MA, please read Note 11,3, Property, PlantRestructuring, Business Transformation and EquipmentOther Cost Savings Initiatives to our consolidated financial statements included in this report.
(3)(4)Long-term debt obligations are primarily related to our Senior Notes, payable includesincluding principal and interest payments.
(4)(5)
Purchase and other obligations primarily includes our obligations to purchase direct materials, and also includes approximatelyour obligation of $5.41.25 billion under the litigation settlement and license agreement with Forward Pharma, $176.3 million in contractual commitments for the construction of a biologics manufacturing facility in Solothurn, Switzerland and $13.6 million related to the fair value of net liabilities on derivative contracts, approximately $8.1 million relatedcontracts. For additional information on the litigation settlement and license agreement with Forward Pharma please read Note 21, Commitments and Contingencies to fixed obligations for the purchase of natural gas and approximately $11.8 million related to obligations for communication services.our consolidated financial statements included in this report.
Tax Related Obligations
We exclude liabilities pertaining to uncertain tax positions from our summary of contractual obligations as we cannot make a reliable estimate of the period of cash settlement with the respective taxing authorities. As of December 31, 2014, we have approximately $80.2 million of net liabilities associated with uncertain tax positions.
Other Funding Commitments
As of December 31, 2014, we have several on-going clinical studies in various clinical trial stages. Our most significant clinical trial expenditures are to contract research organizations (CROs). The contracts with CROs are generally cancellable, with notice, at our option. We have recorded accrued expenses of approximately $41.6 million on our consolidated balance sheet for expenditures incurred by CROs as of December 31, 2014. We have approximately $472.3 million in cancellable future commitments based on existing CRO contracts as of December 31, 2014.
World Federation of Hemophilia (WFH) Humanitarian Aid Program
During 2014, we and Sobi announced plans to donate one billion international units (IUs) of clotting factor therapy for humanitarian aid programs in the developing world. Initially, we intend to donate up to 500 million IUs over five years to support these efforts through the WFH. Under the terms of the agreement, at least 85 percent of donated factor will be ELOCTATE, with the remainder comprised of ALPROLIX. These shipments for humanitarian programs are expected to begin in the second half of 2015, subject to the WFH satisfying certain logistical and ongoing requirements. We will record these donations as cost of sales as the donations are made. 

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Contingent Development, Regulatory and Commercial Milestone Payments
Based on our development plans as of December 31, 2014, we have committed to make potential future milestone payments to third parties of up to approximately $2.8 billion as part of our various collaborations, including licensing and development programs. Payments under these agreements generally become due and payable only upon achievement of certain development, regulatory or commercial milestones. Because the achievement of these milestones had not occurred as of December 31, 2014, such contingencies have not been recorded in our financial statements. Amounts related to contingent milestone payments are not considered contractual obligations as they are contingent on the successful achievement of certain development, regulatory approval and commercial milestones.
We anticipate that we may pay approximately $142.2 million of milestone payments in 2015, provided various development, regulatory or commercial milestones are achieved.
TYSABRI Contingent Payments
On April 2,In 2013 we acquired from Elan full ownership of all remaining rights to TYSABRI from Elan that we did not already own or control. Under the terms of the acquisition agreement, we are obligated to make contingent payments to Elan of 18% on annual worldwide net sales up to $2.0 billion and 25% on annual worldwide net sales that exceed $2.0 billion. Royalty payments to Elan and other third parties are recognized as cost of sales withinin our consolidated statements of income. Elan was acquired by Perrigo in December 2013. Following that acquisition, we began making these royalty payments to Perrigo.
Contingent Consideration related to Business Combinations
In connection with our purchase of the noncontrolling interests in our joint venture investments in Biogen Dompé SRL and Biogen Dompé Switzerland GmbH and our acquisitions of Convergence, Stromedix, Inc. (Stromedix) and Biogen Idec International Neuroscience GmbH (BIN) and BIH,, we may pay upagreed to approximately $850 million in remaining milestonesmake additional payments based upon the achievement of certain milestone events. These milestones may not be achieved.
As the acquisitions of the noncontrolling interests in our joint venture investments and our acquisitions ofConvergence, Stromedix and BIN formerly Panima Pharmaceuticals AG, occurred after January 1, 2009, we record contingent consideration liabilities at their fair value on the acquisition date and revalue these obligations each reporting period. We may pay up to approximately $1.2 billion in remaining milestones
related to these acquisitions. For additional information related to our acquisition of StromedixConvergence please read Note 2, Acquisitions, to our consolidated financial statements included in this report.
BIH
In connection with our acquisition of BIH, formerly Syntonix, in January 2007, we agreed to pay up to an additional $80.0 million if certain milestone events associated with the development of BIH’s lead product, ALPROLIX are achieved. The first $40.0 million contingent payment was achieved in the first quarter of 2010. We paid an additional $20.0 million during the second quarter of 2014 as ALPROLIX was approved for the treatment of hemophilia B. A second $20.0 million contingent payment will occur if prior to the tenth anniversary of the closing date, a marketing authorization is granted by the EMA for ALPROLIX.
Fumapharm AG
In 2006 we acquired Fumapharm AG. As part of this acquisition we acquired FUMADERM and TECFIDERA (together, Fumapharm Products). We are required to make contingent payments to former shareholders of Fumapharm AG or holders of their rights based on the attainment of certain cumulative sales levels of Fumapharm Products and the level of total net sales of Fumapharm Products in the prior twelve month period, as defined in the acquisition agreement.
During 2014,2016 we paid a $25.0 million$1.2 billion in contingent paymentpayments as we reached the $1.0$7.0 billion, $8.0 billion, $9.0 billion and $10.0 billion cumulative sales levellevels related to the Fumapharm Products in 2013, a $150.0 million contingent payment as we reached the $2.0 billion cumulative sales level related to Fumapharm Products in the secondfourth quarter of 2014, a $200.0 million contingent payment as we reached2015 and the $3.0 billion cumulative sales level in thefirst, second and third quarterquarters of 20142016, respectively, and accrued $250.0$300.0 million upon reaching $4.0$11.0 billion in total cumulative sales of Fumapharm Products in the fourth quarter of 2014.2016.
We will owe an additional $300.0 million contingent payment for every additional $1.0 billion in cumulative sales level of Fumapharm Products reached if the prior 12 months sales of the Fumapharm Products exceed $3.0 billion, until such time as the cumulative sales level reaches $20.0 billion, at which time no further contingent payments shall be due. If the prior 12 months sales of Fumapharm Products are less than $3.0 billion, contingent payments remain payable on a decreasing tiered basis. These payments will be accounted for as an increase to goodwill as incurred, in accordance with the accounting standard applicable to business combinations when we acquired Fumapharm. Any portion of the payment which is tax deductible will be recorded as a reduction to goodwill. Payments are due within 60 days following the end of the quarter in which the applicable cumulative sales level has been reached.

Contingent Development, Regulatory and Commercial Milestone Payments
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TableBased on our development plans as of ContentsDecember 31, 2016, we could make potential future milestone payments to third parties of up to approximately $3.1 billion, including approximately $0.5 billion in development milestones, approximately $0.8 billion in regulatory milestones and approximately $1.8 billion in commercial milestones as part of our various collaborations, including licensing and development programs. Payments under these agreements generally become due and payable


upon achievement of certain development, regulatory or commercial milestones. Because the achievement of these milestones had not occurred as of December 31, 2016, such contingencies have not been recorded in our financial statements. Amounts related to contingent milestone payments are not considered contractual obligations as they are contingent on the successful achievement of certain development, regulatory approval and commercial milestones.
We anticipate that we may pay approximately $157.0 million of milestone payments in 2017, provided various development, regulatory or commercial milestones are achieved.
Other Funding Commitments
As of December 31, 2016, we have several on-going clinical studies in various clinical trial stages. Our most significant clinical trial expenditures are to contract research organizations (CROs). The contracts with CROs are generally cancellable, with notice, at our option. We have recorded accrued expenses of approximately $21.0 million on our consolidated balance sheet for expenditures incurred by CROs as of December 31, 2016. We have approximately $500.0 million in cancellable future commitments based on existing CRO contracts as of December 31, 2016.
Tax Related Obligations
We exclude liabilities pertaining to uncertain tax positions from our summary of contractual obligations as we cannot make a reliable estimate of the period of cash settlement with the respective taxing authorities. As of December 31, 2016, we have approximately $47.8 million of net liabilities associated with uncertain tax positions.
Other Off-Balance Sheet Arrangements
We do not have any relationships with entities often referred to as structured finance or special purpose entities that were established for the purpose of facilitating off-balance sheet arrangements. As such, we are not exposed to any financing, liquidity, market or credit risk that could arise if we had engaged in such relationships. We consolidate variable interest entities if we are the primary beneficiary.
Legal Matters
For a discussion of legal matters as of December 31, 2014,2016, please read Note 21,20, Litigation to our consolidated financial statements included in this report.
Critical Accounting Estimates
The preparation of our consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the U.S. (U.S. GAAP), requires us to make estimates, judgments and assumptions that may affect the reported amounts of assets, liabilities, equity, revenues and expenses and related disclosure of contingent assets and liabilities. On an on-going basis we evaluate our estimates, judgments and methodologies. We base our estimates on historical experience and on various other assumptions that we believe are reasonable, the results of which form the basis for making judgments about the carrying values of assets, liabilities and liabilities. We evaluate our estimates, judgmentsequity and assumptions on an ongoing basis.the amount of revenue and expenses. Actual results may differ from these estimates under different assumptions or conditions.
Revenue Recognition and Related Allowances
We recognize revenue when all of the following criteria are met: persuasive evidence of an arrangement exists; delivery has occurred or services have been rendered; our price to the customer is fixed or determinable; and collectability is reasonably assured. For additional information related to the new accounting standard for revenues from contracts with customers please read Note 1, Summary of Significant Accounting Policies: New Accounting Pronouncements to our consolidated financial statements included in this report.
Product Revenues
Revenues from product sales are recognized when title and risk of loss have passed to the customer, which is typically upon delivery. Product revenues are recorded net of applicable reserves for discounts and allowances. The timing of distributor orders and shipments can cause variability in earnings.


Reserves for Discounts and Allowances
We establishRevenues from product sales are recorded net of reserves established for trade termapplicable discounts wholesaler incentives, Medicaid and managed care rebates, VA and PHS discounts, product returns and other governmental discounts or applicable allowances, including those associated with the implementation of pricing actions in certain of the international markets in which we operate. These reserves are based on estimates of the amounts earned or to be claimed on the related sales.sales and are classified as reductions of accounts receivable (if the amount is payable to our customer) or a liability (if the amount is payable to a party other than our customer). Our estimates take into consideration our historical experience, current contractual and statutory requirements, specific known market events and trends, industry data and forecasted customer buying and payment patterns. Actual amounts may ultimately differ from our estimates. If actual results vary, we may need to adjust these estimates, which could have an effect on earnings in the period of the adjustment.
In addition to the discounts and rebates described above and classified as a reduction of revenue, we also maintain certain customer service contracts with distributors and other customers in the distribution channel that provide us with inventory management, data and distribution services.services, which are generally reflected as a reduction of revenue. To the extent we can demonstrate a separable benefit and fair value for these services, we classify these payments within selling, general and administrative expenses.
Revenues from Unconsolidated Joint BusinessAnti-CD20 Therapeutic Programs
Revenues from unconsolidated joint business consists of (i) our share of pre-tax profits and losses in the U.S. for RITUXAN and GAZYVA; anti-CD20 therapeutic programs consist of:
(i) our share of pre-tax profits and losses in the U.S. for RITUXAN and GAZYVA;
(ii)  reimbursement of our selling and development expenses in the U.S. for RITUXAN; and (iii) revenue
(iii)revenues on sales in the rest of world for RITUXAN, which consist of our share of pre-tax co-promotion profits on RITUXAN in Canada and royalty revenue on RITUXAN sales outside the U.S. and Canada by the Roche Group and its sublicensees.
Pre-tax co-promotion profits on RITUXAN and GAZYVA are calculated and paid to us by Genentech in the rest of world for RITUXAN, which consist of our share of pre-tax co-promotion profits in Canada and royalty revenue on sales outside the U.S. and Canada by F. Hoffmann-La Roche Ltd. (Roche) and its sublicensees. Pre-tax co-promotion profits on RITUXAN are calculated and paid to us by Genentech in the U.S. and by Roche Group in Canada. Pre-tax co-promotion profits consist of U.S. and Canadian net sales to third-party customers less the costapplicable costs to manufacture, third-party royalty expenses, distribution, selling and marketing expenses, and joint development expenses incurred by Genentech, the Roche Group and us. We record our share of the pretaxpre-tax co-promotion profits on RITUXAN in Canada and royalty revenues on RITUXAN sales outside the U.S. on a cash basis as we do not have the ability to estimate these profits or royalty revenue in the period incurred. Additionally, ourOur share of the pre-tax profits on RITUXAN and GAZYVA in the U.S. includes estimates made by Genentech and those estimates are subject to change. Actual results may ultimately differ from our estimates.

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Concentrations of Credit Risk
The majority of our receivablesaccounts receivable arise from product sales in the United StatesU.S. and Europe and are primarily due from wholesale distributors, public hospitals and other government entities. We monitor the financial performance and creditworthiness of our large customers so that we can properly assess and respond to changes in their credit profile. We continue to monitor these conditions, including the volatility associated with international economies and the relevant financial markets, and assess their possible impact on our business. The creditCredit and economic conditions within many ofin the international markets in which we operate, particularly in certain countries throughout Europe, such as Italy, Spain and Portugal, remain uncertain. These conditions have resulted in, and mayE.U. continue to result in, an increase in the average length ofremain uncertain, which has, from time that it takes to collect ontime, led to longer collection periods for our accounts receivable outstandingand greater collection risk in thesecertain countries.
In Portugal and select regions in Spain whereWhere our collections have slowedcontinue to be subject to significant payment delays due to government funding and reimbursement practices and a significant portion of these receivables are routinely being collected beyond our contractual payment terms and over periods in excess of one year, we have discounted our receivables and reduced related revenues based on the period of time that we estimate those amounts will be paid, to the extent such period exceeds one year, using the country’s market-based borrowing rate for such period. The related receivables are classified at the time of sale as non-current assets.
To date, we have not experienced any significant losses with respect to the collection of our accounts receivable. If economic conditions worsen and/or the financial condition of our customers were to further deteriorate, our risk of collectability may increase, which may result in additional allowances and/or significant bad debts.


For additional information related to our concentration of credit risk associated with our accounts receivable balances, please read the subsection above entitled “Credit Risk” in thisthe Management’s DiscussionQuantitative and AnalysisQualitative Disclosures About Market Risk” section of Financial Conditionthis report.
Collaborative and ResultsOther Relationships
Our development and commercialization arrangements with Sobi and AbbVie represent collaborative arrangements as each party is an active participant and exposed to significant risks and rewards of Operations.”the arrangements. Where we are the principal on sales transactions with third parties, we recognize revenue, cost of sales and sales and marketing expenses on a gross basis in their respective lines in our consolidated statements of income. Where we are not the principal on sales transactions with third parties, we record our share of the revenues, cost of sales and sales and marketing expenses on a net basis in collaborative and other relationships in our consolidated statements of income.
For additional information related to our collaborations with Sobi and AbbVie, please read Note 19, Collaborative and Other Relationships to these consolidated financial statements.
Capitalization of Inventory Costs
We capitalize inventory costs associated with our products prior to regulatory approval, when, based on management’s judgment, future commercialization is considered probable and the future economic benefit is expected to be realized. We consider numerous attributes in evaluating whether the costs to manufacture a particular product should be capitalized as an asset. We assess the regulatory approval process and where the particular product stands in relation to that approval process, including any known safety or efficacy concerns, potential labeling restrictions and other impediments to approval. We evaluate our anticipated research and development initiatives and constraints relating to the product and the indication in which it will be used. We consider our manufacturing environment including our supply chain in determining logistical constraints that could hamper approval or commercialization. We consider the shelf life of the product in relation to the expected timeline for approval and we consider patent related or contract issues that may prevent or delay commercialization. We also base our judgment on the viability of commercialization, trends in the marketplace and market acceptance criteria. Finally, we consider the reimbursement strategies that may prevail with respect to the product and assess the economic benefit that we are likely to realize. We expense previously capitalized costs related to pre-approval inventory upon a change in such judgment,
due to, among other potential factors, a denial or significant delay of approval by necessary regulatory bodies. All changes in judgment in relation to pre-approval inventory have historically been insignificant.
Acquired Intangible Assets, including In-process Research and Development (IPR&D)
Effective January 1, 2009, when we purchase a business, the acquired IPR&D is measured at fair value, capitalized as an intangible asset and tested for impairment at least annually, as of October 31, until commercialization, after which time the IPR&D is amortized over its estimated useful life. If we acquire an asset or group of assets that do not meet the definition of a business under applicable accounting standards, the acquired IPR&D is expensed on its acquisition date. Future costs to develop these assets are recorded to research and development expense as they are incurred.
We have acquired, and expect to continue to acquire, intangible assets through the acquisition of biotechnology companies or through the consolidation of variable interest entities. These intangible assets primarily consist of technology associated with human therapeutic products and in-process research and developmentIPR&D product candidates. When significant identifiable intangible assets are acquired, we generally engage an independent third-party valuation firm to assist in determining the fair values of these assets as of the acquisition date. Management will determine the fair value of less significant identifiable intangible assets acquired. Discounted cash flow models are typically used in these valuations, and these models require the use of significant estimates and assumptions including but not limited to:
estimating the timing of and expected costs to complete the in-process projects;
projecting regulatory approvals;
estimating future cash flows from product sales resulting from completed products and in process projects; and

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developing appropriate discount rates and probability rates by project.
We believe the fair values assigned to the intangible assets acquired are based upon reasonable estimates and assumptions given available facts and circumstances as of the acquisition dates.


If these projects are not successfully developed, the sales and profitability of the company may be adversely affected in future periods. Additionally, the value of the acquired intangible assets may become impaired. We believe that the foregoing assumptions used in the IPR&D analysis were reasonable at the time of the respective acquisition. No assurance can be given however, that the underlying assumptions used to estimate expected project sales, development costs or profitability, or the events associated with such projects, will transpire as estimated.
Certain IPR&D programs have a fair value that is not significantly in excess of carrying value, including our program for the treatment of TGN. Such programs could become impaired if assumptions used in determining the fair value change.
Impairment and Amortization of Long-lived Assets and Accounting for Goodwill
Long-lived Assets Other than Goodwill
Long-lived assets to be held and used include property, plant and equipment as well as intangible assets, including IPR&D and trademarks. Property, plant and equipment are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable. We review our intangible assets with indefinite lives for impairment annually, as of October 31, and whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable.
When performing our impairment assessment, we calculate the fair value using the same methodology as described above under "Acquired Intangible Assets, including In-process Research and Development (IPR&D)". If the carrying value of our intangible assets with indefinite lives exceeds its fair value, then the intangible asset is written-down to its fair values.value.
Our most significant intangible assets are our acquired and in-licensed rights and patents and developed technology. Acquired and in-licensed rights and patents primarily relates to our acquisition of all remaining rights to TYSABRI from Elan. Developed technology primarily relates to our AVONEX product, which was recorded in connection with the merger of Biogen, Inc. and IDEC Pharmaceuticals Corporation in 2003. We amortize the intangible assets related to TYSABRI and AVONEX using the economic consumption method based on revenue generated from the products underlying the related intangible assets. An analysis of the anticipated lifetime revenues of TYSABRI and AVONEX is performed annually during our long range planning cycle, which is generally updated in the third quarter of each year, and whenever events or changes in circumstances
would significantly affect the anticipated lifetime revenues of TYSABRI or AVONEX.
For additional information on the impairment charges related to our long-lived assets during 2016 and 2014, please read Note 7,6, Intangible Assets and Goodwill to our consolidated financial statements included withinin this report. Impairment charges related to our long-lived assets during 2013 and 20122015 were immaterial.insignificant.
Goodwill
Goodwill relates largely to amounts that arose in connection with the merger of Biogen, Inc. and IDEC Pharmaceuticals Corporation.Corporation in 2003 and amounts that are being paid in connection with the acquisition of Fumapharm AG. Our goodwill balances represent the difference between the purchase price and the fair value of the identifiable tangible and intangible net assets when accounted for using the purchase method of accounting.
We assess our goodwill balance within our single reporting unit annually, as of October 31, and whenever events or changes in circumstances indicate the carrying value of goodwill may not be recoverable to determine whether any impairment in this asset may exist and, if so, the extent of such impairment. We compare the fair value of our reporting unit to its carrying value. If the carrying value of the net assets assigned to the reporting unit exceeds the fair value of our reporting unit, then we would need to determine the implied fair value of our reporting unit’s goodwill. If the carrying value of our reporting unit’s goodwill exceeds its implied fair value, then we would record an impairment loss equal to the difference.
We completed our required annual impairment test in the fourth quarterquarters of 2016, 2015 and 2014, 2013 and 2012respectively, and determined in each of those periods that the carrying value of goodwill was not impaired. In each year, the fair value of our reporting unit, which includes goodwill, was significantly in excess of the carrying value of our reporting unit.

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Investments, including Fair Value Measures and Impairments
We invest in various types of securities, including short-term and long-term marketable securities, principally corporate notes, government securities including government sponsored enterprise mortgage-backed securities and credit card and auto loan asset-backed securities, in which our excess cash balances are invested.
In accordance with the accounting standard for fair value measurements, we have classified our financial assets as Level 1, 2 or 3 within the fair value hierarchy. Fair values determined by Level 1 inputs utilize quoted prices (unadjusted) in active markets for identical assets that we have the ability to access. Fair values determined by Level 2 inputs utilize data points that are observable such as quoted prices, interest rates, yield curves and yield curves.foreign currency spot rates. Fair values determined by Level 3 inputs utilize unobservable data points for the asset.
As noted in Note 8,7, Fair Value Measurements to our consolidated financial statements, a majority of our financial assets have been classified as Level 2. These assets have been initially valued at the transaction price and subsequently valued utilizing third partythird-party pricing services. The pricing services use many observable market inputs to determine value, including reportable trades, benchmark yields, credit spreads, broker/dealer quotes, bids, offers, current spot rates and other industry and economic events. We validate the prices provided by our third partythird-party pricing services by understanding the models used, obtaining market values from other pricing sources and analyzing pricing data in certain instances.
We also have some investments classified as Level 3 whose fair value is initially measured at transaction prices and subsequently valued using the pricing of recent financing or by reviewing the underlying economic fundamentals and liquidation value of the companies. We apply judgments and estimates when we validate the prices provided by third parties. While we believe the valuation methodologies are appropriate, the use of valuation methodologies is highly judgmental and changes in methodologies can have a material impact on our results of operations.
Impairment
We conduct periodic reviews to identify and evaluate each investment that has an unrealized loss, in accordance with the meaning of other-than-temporary impairment and its application to certain investments. An unrealized loss exists when the current fair value of an individual security is less than its amortized cost basis. Unrealized losses on available-for-sale debt securities that are determined to be temporary, and not related to credit loss, are recorded, net of tax, in accumulated other comprehensive income.
For available-for-sale debt securities with unrealized losses, management performs an analysis to assess whether we intend to sell or whether we would more likely than not be required to sell the security before the expected recovery of the amortized cost basis. Where we intend to sell a security, or may be required to do so, the security’s decline in fair value is deemed to be other-than-temporary and the full amount of the unrealized loss is reflected within earnings as an impairment loss.
Regardless of our intent to sell a security, we perform additional analysis on all securities with unrealized losses to evaluate losses associated with the creditworthiness of the security. Credit losses are identified where we do not expect to receive cash flows sufficient to recover the amortized cost basis of a security and are reflected within earnings as an impairment loss.
Share-Based Compensation
We make certain assumptions in order to value and record expense associated with awards made under our share-based compensation arrangements. Changes in these assumptions may lead to variability with respect to the amount of expense we recognize in connection with share-based payments.
Determining the appropriate valuation model and related assumptions requires judgment, and includes estimating the expected market price of our stock on vesting date and stock price volatility as well as the term of the expected awards. Determining the appropriate amount to expense based on the anticipated achievement of performance targets requires judgment, including forecasting the achievement of future financial targets. The estimate of expense is revised periodically based on the probability of achieving the required performance targets and adjustments are made throughout the performanceterm as appropriate. The cumulative impact of any revision is reflected in the period of change.
We also estimate forfeitures over the requisite service period when recognizing share-based compensation expense based on historical rates and forward-looking factors; thesefactors. These estimates are adjusted to the extent that actual forfeitures differ, or are expected to materially differ, from our estimates.

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Contingent Consideration
For acquisitions completed before January 1, 2009, we record contingent consideration resulting from a business combination when the contingency is resolved. For acquisitions completed after January 1, 2009, we record contingent consideration resulting from a business combination at its fair value on the acquisition date. Each reporting period thereafter, we revalue these obligations and record increases or decreases in their fair value as an adjustment to contingent consideration expense within thein our consolidated statementstatements of income. Changes in the fair value of the contingent consideration obligations can result from changes to one or multiple inputs including adjustments to the discount rates and achievement and timing of any cumulative sales-based and development milestones, or changes in the probability of certain clinical events and changes in the assumed probability associated with regulatory approval. These fair value measurements represent Level 3 measurements as they are based on significant inputs not observable in the market.
Significant judgment is employed in determining the appropriateness of these assumptions as of the acquisition date and for each subsequent period. Accordingly, changes in assumptions described above, could have a material impact on the amount of contingent consideration expense we record in any given period.
Restructuring Charges
We have made estimates and judgments regarding the amount and timing of our restructuring expense and liability, including current and future period termination benefits, pipeline program termination costs and other exit costs to be incurred when related actions take place. Severance and other related costs are reflected in our consolidated statements of income as a component of total restructuring charges incurred. Actual results may differ from these estimates.
Income Taxes
We prepare and file income tax returns based on our interpretation of each jurisdiction’s tax laws and regulations. In preparing our consolidated financial statements, we estimate our income tax liability in each of the jurisdictions in which we operate by estimating our actual current tax expense together with assessing temporary differences resulting from differing treatment of items for tax and financial reporting purposes. These differences result in deferred tax assets and liabilities, which are included in our consolidated balance sheets. Significant management judgment is required in assessing the realizability of our deferred tax assets. In performing this assessment, we consider whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. In making this determination, under the applicable financial accounting standards, we are allowed to consider the scheduled reversal of deferred tax liabilities, projected future taxable income and the effects of tax planning strategies. Our estimates of future taxable income include, among other items, our estimates of future income tax deductions related to the exercise of stock options. In the event that actual results differ from our estimates, we adjust our estimates in future periods and we may need to establish a valuation allowance, which could materially impact our financial position and results of operations.
All tax effects associated with intercompany transfers of assets within our consolidated group, both current and deferred, are recorded as a prepaid tax or deferred charge and recognized through theour consolidated statementstatements of income when the asset transferred is sold to a third partythird-party or otherwise recovered through amortization of the asset's remaining economic life. If the asset transferred becomes impaired, for example through the obsolescence of inventory or the discontinuation of a research program, we will expense any remaining deferred charge or prepaid tax. As of December 31, 2016, total deferred charges and prepaid taxes were $989.8 million. For additional information related to the new accounting standard on tax effects associated with intercompany transfers of assets within our consolidated group please read Note 1, Summary of Significant Accounting Policies: New Accounting Pronouncements to our consolidated financial statements included in this report.


We account for uncertain tax positions using a “more-likely-than-not” threshold for recognizing and resolving uncertain tax positions. We evaluate uncertain tax positions on a quarterly basis and consider various factors that include, but are not limited to, changes in tax law, the measurement of tax positions taken or expected to be taken in tax returns, the effective settlement of matters subject to audit, information obtained during in process audit activities and changes in facts or circumstances related to a tax position. We adjust the level of the liability to reflect any subsequent changes in the relevant facts surrounding the uncertain positions. Our liabilities for uncertain tax positions can be relieved only if the contingency becomes legally extinguished, through either payment to the taxing authority or the expiration of the statute of limitations, the recognition of the benefits associated with the position meet the “more-likely-than-not” threshold or the liability becomes effectively settled through the examination process. We consider matters to be effectively settled once the taxing authority has completed all of its required or expected examination procedures, including all appeals and administrative reviews;reviews, we have no plans to appeal or litigate any aspect of the tax position;position, and we believe that it is highly unlikely that the taxing authority would examine or re-examine the related tax position. We also accrue for potential interest and penalties related to unrecognized tax benefits in income tax expense.
We earn a significant amount of our operating income outside the U.S. As a result, a portion of our cash, cash equivalents and marketable securities are held by foreign subsidiaries. We currently do not intend or foresee a need to repatriate these funds. We expect existing domestic cash, cash equivalents, marketable securities and cash flows from operations to continue to be sufficient to fund our domestic operating activities and cash commitments for investing and financing activities for the foreseeable future.

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As of December 31, 2014,2016, our non-U.S. subsidiaries’ undistributed foreign earnings included in consolidated retained earnings and other basis differences aggregated to approximately $4.6$7.6 billion. All undistributed foreign earnings of non-U.S. subsidiaries, exclusive of earnings that would result in little or no net income tax expense or which were previously taxed under current U.S. tax law, are reinvested indefinitely in operations outside the U.S. This determination is made on a jurisdiction-by-jurisdiction basis and takes into the account the liquidity requirements in both the U.S. and within our foreign subsidiaries. 
If we decide to repatriate funds in the future to execute our growth initiatives or to fund any other liquidity needs, the resulting tax consequences would negatively impact our results of operations through a higher effective tax rate and dilution of our earnings. The residual U.S. tax liability, if cumulative amounts were repatriated, would be between $1.5$1.8 billion to $1.6$2.3 billion as of December 31, 2014.2016.
New Accounting Standards
For a discussion of new accounting standards please read Note 1, Summary of Significant Accounting Principles to our consolidated financial statements included in this report.
Item 7A.
Item 7A.        Quantitative and Qualitative Disclosures About Market Risk
Market Risk
We are subject to certain risks which may affect our results of operations, cash flows and fair values of assets and liabilities, including volatility in foreign currency exchange rates, interest rate movements, pricing pressures worldwide and weak economic conditions in the foreign markets in which we operate. We manage the impact of foreign currency exchange rates and interest rates through various financial instruments, including derivative instruments such as foreign currency forward contracts, interest rate lock contracts and interest rate swap contracts. We do not enter into financial instruments for trading or speculative purposes. The counter-parties to these contracts are major financial institutions and there is no significant concentration of exposure with any one counter-party.
Foreign Currency Exchange Risk
Our results of operations are subject to foreign currency exchange rate fluctuations due to the global nature of our operations. We have operations or maintain distribution relationships in the U.S., Europe, Canada, Asia, Central and South America. In addition, we recognize our share of pre-tax co-promotion profits on RITUXAN in Canada. As a result, our financial position, results of operations and cash flows can be affected by market fluctuations in foreign exchange rates, primarily with respect to the Euro, British pound sterling, Canadian dollar, Swiss franc, Danish krone and Japanese yen.


While the financial results of our global activities are reported in U.S. dollars, the functional currency for most of our foreign subsidiaries is their respective local currency. Fluctuations in the foreign currency exchange rates of the countries in which we do business will affect our operating results, often in ways that are difficult to predict. In particular, as the U.S. dollar strengthens versus other currencies, the value of non-U.S. revenue will decline when reported in U.S. dollars. The impact to net income as a result of a strengthening U.S. dollar will be partially mitigated by the value of non-U.S. expense which will also decline when reported in U.S. dollars. As the U.S. dollar weakens versus other currencies, the value of non-U.S. revenue and expenses will increase when reported in U.S. dollars.
We have established revenue and operating expense hedging and balance sheet risk management programs to protect against volatility of future foreign currency cash flows and changes in fair value caused by volatility in foreign exchange rates.
In June 2016 the U.K. voted in a referendum to voluntarily depart from the E.U., known as Brexit. The macroeconomic impact on our results of operations from this vote remains unknown. To date, the foreign exchange impact has been negligible since we hedged the balance sheet foreign currency exchange risk.
Revenue and Operating Expense Hedging Program
Quantitative and Qualitative Disclosures About Market Risk
Our foreign currency hedging program is designed to mitigate, over time, a portion of the impact resulting from volatility in exchange rate changes on revenues and operating expenses. We use foreign currency forward contracts to manage foreign currency risk, with the majority of our forward contracts used to hedge certain forecasted revenue and operating expense transactions denominated in foreign currencies in the next 18 months. We do not engage in currency speculation. For a more detailed disclosure of our revenue and operating expense hedging program, please read Note 9, Derivative Instruments to our consolidated financial statements included in this report.
Our ability to mitigate the impact of exchange rate changes on revenues and net income diminishes as significant exchange rate fluctuations are sustained over extended periods of time. In particular, devaluation or significant deterioration of foreign currency exchange rates are difficult to mitigate and likely to negatively impact earnings. The cash flows from these contracts are reported as operating activities in our consolidated statements of cash flows.
Balance Sheet Risk Management Hedging Program
We also use forward contracts to mitigate the foreign currency exposure related to certain balance sheet items. The primary objective of our balance sheet risk management program is to mitigate the exposure of foreign currency denominated net monetary assets of foreign affiliates. In these instances, we principally utilize currency forward contracts. We have not elected hedge accounting for the balance sheet related items. The cash flows from these contracts are reported as operating activities in our consolidated statement of cash flows.
The following quantitative information requiredincludes the impact of currency movements on forward contracts used in our revenue, operating expense and balance sheet hedging programs. As of December 31, 2016 and 2015, a hypothetical adverse 10% movement in foreign currency rates compared to the U.S. dollar across all maturities would result in a hypothetical decrease in the fair value of forward contracts of approximately $172.0 million and $185.0 million, respectively. The estimated fair value change was determined by measuring the impact of the hypothetical exchange rate movement on outstanding forward contracts. Our use of this Itemmethodology to quantify the market risk of such instruments is incorporatedsubject to assumptions and the actual impact could be significantly different. The quantitative information about market risk is limited because it does not take into account all foreign currency operating transactions.
Interest Rate Risk
Our investment portfolio includes cash equivalents and short-term investments. The fair value of our marketable securities is subject to change as a result of potential changes in market interest rates. The potential change in fair value for interest rate sensitive instruments has been assessed on a hypothetical 100 basis point adverse movement across all maturities. As of December 31, 2016 and 2015, we estimate that such hypothetical 100 basis point adverse movement would result in a hypothetical loss in fair value of approximately $50.0 million and $43.0 million, respectively, to our interest rate sensitive instruments. The fair values of our investments were determined using third-party pricing services or other market observable data.


To achieve a desired mix of fixed and floating interest rate debt, we entered into interest rate swap contracts during 2015 for certain of our fixed-rate debt. These derivative contracts effectively converted a fixed-rate interest coupon to a floating-rate LIBOR-based coupon over the life of the respective note. As of December 31, 2016 and 2015, a 100 basis-point adverse movement (increase in LIBOR) would increase annual interest expense by approximately $6.8 million in each case.
Pricing Pressure
Governments in some international markets in which we operate have implemented measures aimed at reducing healthcare costs to constrain the overall level of government expenditures. These implemented measures vary by country and include, among other things, mandatory rebates and discounts, prospective and possible retroactive price reductions and suspensions on price increases of pharmaceuticals.
In addition, certain countries set prices by reference to the discussion under “Market Risk”prices in other countries where our products are marketed. Thus, our inability to secure favorable prices in a particular country may impair our ability to obtain acceptable prices in existing and potential new markets, which may limit market growth. The continued implementation of pricing actions throughout Europe may also lead to higher levels of parallel trade.
In the U.S., federal and state legislatures, health agencies and third-party payors continue to focus on containing the cost of health care. Legislative and regulatory proposals, enactments to reform health care insurance programs and increasing pressure from social sources could significantly influence the manner in which our products are prescribed and purchased. It is possible that additional federal health care reform measures will be adopted in the future, which could result in increased pricing pressure and reduced reimbursement for our products and otherwise have an adverse impact on our financial position or results of operations.
There is also significant economic pressure on state budgets that may result in states increasingly seeking to achieve budget savings through mechanisms that limit coverage or payment for our drugs. Managed care organizations are also continuing to seek price discounts and, in some cases, to impose restrictions on the coverage of particular drugs.
Credit Risk
We are subject to credit risk from our accounts receivable related to our product sales. The majority of our accounts receivable arise from product sales in the U.S. and Europe with concentrations of credit risk limited due to the wide variety of customers and markets using our products, as well as their dispersion across many different geographic areas. Our accounts receivable are primarily due from wholesale distributors, public hospitals, specialty pharmacies and other government entities. We monitor the financial performance and creditworthiness of our customers so that we can properly assess and respond to changes in their credit profile. We operate in certain countries where weakness in economic conditions can result in extended collection periods. We continue to monitor these conditions, including the volatility associated with international economies and the relevant financial markets, and assess their possible impact on our business. To date, we have not experienced any significant losses with respect to the collection of our accounts receivable.
Credit and economic conditions in the E.U. continue to remain uncertain, which has, from time to time, led to long collection periods for our accounts receivable and greater collection risk in certain countries.
We believe that our allowance for doubtful accounts was adequate as of December 31, 2016 and 2015. However, if significant changes occur in the availability of government funding or the reimbursement practices of these or other governments, we may not be able to collect on amounts due to us from customers in such countries and our results of operations could be adversely affected.
Item 7. “Management’s Discussion8.        Financial Statements and Analysis of Financial Condition and Results of Operations.”Supplementary Data
Item 8.
Financial Statements and Supplementary Data
The information required by this Item 8 is contained on pages F-1 through F-65F-75 of this report and is incorporated herein by reference.
Item 9.
Item 9.        Changes in and Disagreements with Accountants on Accounting and Financial Disclosure
Changes in and Disagreements with Accountants on Accounting and Financial Disclosure
None.
Item 9A.


Item 9A.        Controls and Procedures
Controls and Procedures
Disclosure Controls and Procedures and Internal Control over Financial Reporting
Controls and Procedures
We have carried out an evaluation, under the supervision and with the participation of our management, including our principal executive officer and principal financial officer, of the effectiveness of the design and operation of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended), as of December 31, 2014.2016. Based upon that evaluation, our principal executive officer and principal financial officer concluded that, as of the end of the period covered by this report, our disclosure controls and procedures are effective in ensuring that (a) the information required to be disclosed by us in the reports that we file or submit under the Securities Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms, and (b) such information is accumulated and communicated to our management, including our principal executive officer and principal financial officer, as appropriate to allow timely decisions regarding required disclosure. In designing and evaluating our disclosure controls and procedures, our management recognized that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives, and our management necessarily was required to apply its judgment in evaluating the cost-benefit relationship of possible controls and procedures.
Changes in Internal Control over Financial Reporting
There were no changes in our internal control over financial reporting during the quarter ended December 31, 20142016 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.
Management’s Annual Report on Internal Control over Financial Reporting
Our management is responsible for establishing and maintaining adequate internal control over our financial reporting. Internal control over financial reporting is defined in Rules 13a-15(f) and 15d-15(f) under the Securities Exchange Act as a process designed by, or under the supervision of, a company’s principal executive and principal financial officers and effected by a company’s board of directors, management and other personnel to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with
U.S. GAAP. Our internal control over financial reporting includes those policies and procedures that:

63


pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect our transactions and dispositions of our assets;
provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with U.S. GAAP, and that our receipts and expenditures are being made only in accordance with authorizations of our management and directors; and
provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of our assets that could have a material effect on our financial statements.
Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
Our management assessed the effectiveness of our internal control over financial reporting as of December 31, 2014.2016. In making this assessment, management used the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in its 2013 Internal Control — Integrated Framework.
Based on our assessment, our management has concluded that, as of December 31, 2014,2016, our internal control over financial reporting is effective based on those criteria.
The effectiveness of our internal control over financial reporting as of December 31, 20142016 has been audited by PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in their attestation report, which is included herein.
Item 9B.
Item 9B.        Other Information
Other Information
None.

64



PART III
Item 10.
Item 10.        Directors, Executive Officers and Corporate Governance
Directors, Executive Officers and Corporate Governance
The information concerning our executive officers is set forth under the heading “Our Executive Officers” in Part I of this report. The text of our code of business conduct, which includes the code of ethics that applies to our principal executive officer, principal financial officer, principal accounting officer or controller, and persons performing similar functions, is posted on our website, www.biogenidec.com,www.biogen.com, under the “Corporate Governance” subsection of the “About Us” section of the site. We intend to make all required disclosures regarding any amendments to, or waivers from, provisions of our code of business conduct at the same location of our website.
The response to the remainder of this item is incorporated by reference from the discussion responsive thereto in the sections entitled “Proposal 1 - Election of Directors,” “Corporate Governance at Biogen,” “Stock Ownership - Section 16(a) Beneficial Ownership Reporting Compliance” and “Miscellaneous - Stockholder Proposals” contained in the proxy statement for our 20152017 annual meeting of stockholders.
Item 11.
Item 11.        Executive Compensation
Executive Compensation
The response to this item is incorporated by reference from the discussion responsive thereto in the sections entitled “Executive Compensation and Related InformationMatters” and “Corporate Governance”Governance at Biogen” contained in the proxy statement for our 20152017 annual meeting of stockholders.
Item 12.
Item 12.        Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters
Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters
The response to this item is incorporated by reference from the discussion responsive thereto in the sections entitled “Stock Ownership” and “Equity Compensation Plan Information” contained in the proxy statement for our 20152017 annual meeting of stockholders.
Item 13.
Item 13.        Certain Relationships and Related Transactions, and Director Independence
Certain Relationships and Related Transactions, and Director Independence
The response to this item is incorporated by reference from the discussion responsive thereto in the sections entitled “Certain Relationships and Related Person Transactions” and “Corporate Governance at Biogen” contained in the proxy statement for our 20152017 annual meeting of stockholders.
Item 14.
Item 14.        Principal Accounting Fees and Services
Principal Accountant Fees and Services
The response to this item is incorporated by reference from the discussion responsive thereto in the section entitled “Proposal 2 — Ratification of the Selection of our Independent Registered Public Accounting Firm” contained in the proxy statement for our 20152017 annual meeting of stockholders.

65



PART IV
Item 15.Exhibits and Financial Statement Schedules
a.
Item 15.     Exhibits and Financial Statement Schedules
a.     (1) Consolidated Financial Statements:
The following financial statements are filed as part of this report:
Financial Statements Page Number
Consolidated Statements of Income F-2
Consolidated Statements of Comprehensive Income F-3
Consolidated Balance Sheets F-4
Consolidated Statements of Cash Flows F-5
Consolidated Statements of Equity F-6
Notes to Consolidated Financial Statements F-9
Report of Independent Registered Public Accounting Firm F-64F-75
Certain totals may not sum due to rounding.
(2) Financial Statement Schedules
Schedules are omitted because they are not applicable, or are not required, or because the information is included in the consolidated financial statements and notes thereto.
(3) Exhibits
The exhibits listed on the Exhibit Index beginning on page A-1, which is incorporated herein by reference, are filed or furnished as part of this report or are incorporated into this report by reference.

66


SIGNATURES
Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.
 
BIOGEN IDEC INC.
  
By:
/S/    GMEORGEICHEL A. SVCANGOSOUNATSOS
 George A. ScangosMichel Vounatsos
 Chief Executive Officer
Date: February 4, 20152, 2017

67


Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.
Name  Capacity Date
     
/S/    GMEORGEICHEL A. SVCANGOSOUNATSOS
  Director and Chief Executive Officer (principal executive officer) February 4, 20152, 2017
George A. ScangosMichel Vounatsos  
     
/S/    PAUL J. CLANCY
  Executive Vice President, Finance and Chief Financial Officer (principal financial officer) February 4, 20152, 2017
Paul J. Clancy  
     
/S/    GREGORY F. COVINO
 Vice President, Finance, Chief Accounting Officer (principal accounting officer) February 4, 20152, 2017
Gregory F. Covino  
     
/S/    STELIOS PAPADOPOULOS
  Director and Chairman of the Board of Directors February 4, 20152, 2017
Stelios Papadopoulos  
     
/S/    ALEXANDER J. DENNER
  Director February 4, 20152, 2017
 Alexander J. Denner  
     
/S/    CAROLINE D. DORSA
  Director February 4, 20152, 2017
Caroline D. Dorsa  
     
/S/    NANCY L. LEAMING
  Director February 4, 20152, 2017
Nancy L. Leaming  
     
/S/    RICHARD C. MULLIGAN
  Director February 4, 20152, 2017
Richard C. Mulligan  
     
/S/    ROBERT W. PANGIA
  Director February 4, 20152, 2017
Robert W. Pangia  
     
/S/    BRIAN S. POSNER
 Director February 4, 20152, 2017
Brian S. Posner  
     
/S/    ERIC K. ROWINSKY
 Director February 4, 20152, 2017
Eric K. Rowinsky  
     
/S/    LYNN SCHENK
 Director February 4, 20152, 2017
Lynn Schenk  
     
/S/    STEPHEN A. SHERWIN
 Director February 4, 20152, 2017
Stephen A. Sherwin  

68


BIOGEN IDEC INC. AND SUBSIDIARIES
CONSOLIDATED FINANCIAL STATEMENTS
   Page Number
Consolidated Statements of Income  F-2
Consolidated Statements of Comprehensive Income F-3
Consolidated Balance Sheets  F-4
Consolidated Statements of Cash Flows  F-5
Consolidated Statements of Equity  F-6
Notes to Consolidated Financial Statements  F-9
Report of Independent Registered Public Accounting Firm  F-64F-75




























F- 1


BIOGEN IDEC INC. AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF INCOME
(In thousands,millions, except per share amounts)
For the Years Ended December 31,For the Years Ended December 31,
2014 2013 20122016 2015 2014
Revenues:          
Product, net$8,203,404
 $5,542,331
 $4,166,074
$9,817.9
 $9,188.5
 $8,203.4
Unconsolidated joint business1,195,389
 1,126,017
 1,137,923
Revenues from anti-CD20 therapeutic programs1,314.5
 1,339.2
 1,195.4
Other304,531
 263,851
 212,464
316.4
 236.1
 304.5
Total revenues9,703,324
 6,932,199
 5,516,461
11,448.8
 10,763.8
 9,703.3
Cost and expenses:          
Cost of sales, excluding amortization of acquired intangible assets1,171,036
 857,726
 545,494
1,478.7
 1,240.4
 1,171.0
Research and development1,893,422
 1,444,053
 1,334,919
1,973.3
 2,012.8
 1,893.4
Selling, general and administrative2,232,342
 1,712,051
 1,277,465
1,947.9
 2,113.1
 2,232.3
Amortization of acquired intangible assets489,761
 342,948
 202,204
385.6
 382.6
 489.8
Collaboration profit sharing
 85,357
 317,895
(Gain) loss on fair value remeasurement of contingent consideration(38,893) (547) 27,202
Restructuring charges
 
 2,225
33.1
 93.4
 
Loss (gain) on fair value remeasurement of contingent consideration14.8
 30.5
 (38.9)
Collaboration profit (loss) sharing10.2
 
 
TECFIDERA litigation settlement and license charges454.8
 
 
Total cost and expenses5,747,668
 4,441,588
 3,707,404
6,298.4
 5,872.8
 5,747.7
Gain on sale of rights16,758
 24,898
 46,792

 
 16.8
Income from operations3,972,414
 2,515,509
 1,855,849
5,150.4
 4,891.0
 3,972.4
Other income (expense), net(25,781) (34,930) (744)(217.4) (123.7) (25.8)
Income before income tax expense and equity in loss of investee, net of tax3,946,633
 2,480,579
 1,855,105
4,933.0
 4,767.3
 3,946.6
Income tax expense989,942
 601,014
 470,554
1,237.3
 1,161.6
 989.9
Equity in loss of investee, net of tax15,126
 17,224
 4,518

 12.5
 15.1
Net income2,941,565
 1,862,341
 1,380,033
3,695.7
 3,593.2
 2,941.6
Net income attributable to noncontrolling interests, net of tax6,781
 
 
Net income attributable to Biogen Idec Inc.$2,934,784
 $1,862,341
 $1,380,033
Net (loss) income attributable to noncontrolling interests, net of tax(7.1) 46.2
 6.8
Net income attributable to Biogen Inc.$3,702.8
 $3,547.0
 $2,934.8
Net income per share:          
Basic earnings per share attributable to Biogen Idec Inc.$12.42
 $7.86
 $5.80
Diluted earnings per share attributable to Biogen Idec Inc.$12.37
 $7.81
 $5.76
Basic earnings per share attributable to Biogen Inc.$16.96
 $15.38
 $12.42
Diluted earnings per share attributable to Biogen Inc.$16.93
 $15.34
 $12.37
Weighted-average shares used in calculating:          
Basic earnings per share attributable to Biogen Idec Inc.236,359
 236,919
 237,938
Diluted earnings per share attributable to Biogen Idec Inc.237,176
 238,308
 239,740
Basic earnings per share attributable to Biogen Inc.218.4
 230.7
 236.4
Diluted earnings per share attributable to Biogen Inc.218.8
 231.2
 237.2




See accompanying notes to these consolidated financial statements.

F- 2


BIOGEN IDEC INC. AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
(In thousands)millions)
 For the Years Ended December 31,
 2014 2013 2012
Net income attributable to Biogen Idec Inc.$2,934,784
 $1,862,341
 $1,380,033
Other comprehensive income:     
Unrealized gains (losses) on securities available for sale:     
Unrealized gains (losses) recognized during the period, net of tax of $80, $6,394 and $2,940411
 11,770
 5,080
Less: reclassification adjustment for (gains) losses included in net income, net of tax of $3,462, $5,576 and $486(6,429) (10,355) (903)
Unrealized gains (losses) on securities available for sale, net of tax of $3,542, $818 and $2,454(6,018) 1,415
 4,177
Unrealized gains (losses) on foreign currency forward contracts:     
Unrealized gains (losses) recognized during the period, net of tax of $760, $1,721 and $1,396101,792
 (26,679) (11,808)
Less: reclassification adjustment for (gains) losses included in net income, net of tax of $500, $533 and $3,360(6,349) 13,716
 (31,713)
Unrealized gains (losses) on foreign currency forward contracts, net of tax of $260, $1,187 and $4,75695,443
 (12,963) (43,521)
Unrealized gains (losses) on pension benefit obligation(11,950) 2,096
 (12,656)
Currency translation adjustment(109,218) 37,012
 23,230
Total other comprehensive income (loss), net of tax(31,743) 27,560
 (28,770)
Comprehensive income attributable to Biogen Idec Inc.2,903,041
 1,889,901
 1,351,263
Comprehensive income attributable to noncontrolling interests, net of tax6,781
 
 65
Comprehensive income$2,909,822
 $1,889,901
 $1,351,328
 For the Years Ended December 31,
 2016 2015 2014
Net income attributable to Biogen Inc.$3,702.8
 $3,547.0
 $2,934.8
Other comprehensive income:     
Unrealized gains (losses) on securities available for sale:     
Unrealized gains (losses) recognized during the period, net of tax(10.6) (1.7) 0.4
Less: reclassification adjustment for (gains) losses included in net income, net of tax0.6
 1.3
 (6.4)
Unrealized gains (losses) on securities available for sale, net of tax(10.0) (0.4) (6.0)
Unrealized gains (losses) on cash flow hedges:     
Unrealized gains (losses) recognized during the period, net of tax51.6
 110.8
 101.7
Less: reclassification adjustment for (gains) losses included in net income, net of tax(4.0) (172.3) (6.3)
Unrealized gains (losses) on cash flow hedges, net of tax47.6
 (61.5) 95.4
Unrealized gains (losses) on pension benefit obligation5.1
 (6.2) (12.0)
Currency translation adjustment(138.6) (96.4) (109.2)
Total other comprehensive income (loss), net of tax(95.9) (164.5) (31.8)
Comprehensive income attributable to Biogen Inc.3,606.9
 3,382.5
 2,903.0
Comprehensive income (loss) attributable to noncontrolling interests, net of tax(7.1) 46.2
 6.8
Comprehensive income$3,599.8
 $3,428.7
 $2,909.8


























See accompanying notes to these consolidated financial statements.

F- 3


BIOGEN IDEC INC. AND SUBSIDIARIES
CONSOLIDATED BALANCE SHEETS
(In thousands,millions, except per share amounts)
As of December 31,As of December 31,
2014 20132016 2015
ASSETS
Current assets:      
Cash and cash equivalents$1,204,924
 $602,562
$2,326.5
 $1,308.0
Marketable securities640,460
 620,167
2,568.6
 2,120.5
Accounts receivable, net1,292,445
 824,406
1,441.6
 1,227.0
Due from unconsolidated joint business, net283,360
 252,662
Due from anti-CD20 therapeutic programs, net300.6
 314.5
Inventory804,022
 659,003
1,001.6
 893.4
Other current assets447,462
 226,134
1,093.3
 836.9
Total current assets4,672,673
 3,184,934
8,732.2
 6,700.3
Marketable securities1,470,652
 625,772
2,829.4
 2,760.4
Property, plant and equipment, net1,765,683
 1,750,710
2,501.8
 2,187.6
Intangible assets, net4,028,507
 4,474,653
3,808.3
 4,085.1
Goodwill1,760,249
 1,232,916
3,669.3
 2,663.8
Investments and other assets618,795
 594,350
1,335.8
 1,107.6
Total assets$14,316,559
 $11,863,335
$22,876.8
 $19,504.8
LIABILITIES AND EQUITY
Current liabilities:      
Current portion of notes payable$3,136
 $3,494
Current portion of notes payable and other financing arrangements$4.7
 $4.8
Taxes payable168,058
 179,685
231.9
 208.7
Accounts payable229,178
 219,913
279.8
 267.4
Accrued expenses and other1,819,334
 1,355,187
2,903.5
 2,096.8
Total current liabilities2,219,706
 1,758,279
3,419.9
 2,577.7
Notes payable582,061
 592,433
Long-term deferred tax liability50,656
 232,554
Notes payable and other financing arrangements6,512.7
 6,521.5
Deferred tax liability93.1
 124.9
Other long-term liabilities650,096
 659,231
722.5
 905.8
Total liabilities3,502,519
 3,242,497
10,748.2
 10,129.9
Commitments and contingencies

 



 

Equity:      
Biogen Idec Inc. shareholders’ equity   
Biogen Inc. shareholders’ equity   
Preferred stock, par value $0.001 per share
 

 
Common stock, par value $0.0005 per share129
 128
0.1
 0.1
Additional paid-in capital4,196,156
 4,023,651

 
Accumulated other comprehensive loss(59,488) (27,745)(319.9) (224.0)
Retained earnings9,283,919
 6,349,135
15,071.6
 12,208.4
Treasury stock, at cost; 22,562 shares and 19,641 shares, respectively(2,611,706) (1,724,927)
Total Biogen Idec Inc. shareholders’ equity10,809,010
 8,620,242
Treasury stock, at cost; 22.6 million shares, respectively(2,611.7) (2,611.7)
Total Biogen Inc. shareholders’ equity12,140.1
 9,372.8
Noncontrolling interests5,030
 596
(11.5) 2.1
Total equity10,814,040
 8,620,838
12,128.6
 9,374.9
Total liabilities and equity$14,316,559
 $11,863,335
$22,876.8
 $19,504.8




See accompanying notes to these consolidated financial statements.

F- 4


BIOGEN IDEC INC. AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF CASH FLOWS
(In thousands)millions)
 For the Years Ended December 31,
 2014 2013 2012
Cash flows from operating activities:     
Net income$2,941,565
 $1,862,341
 $1,380,033
Adjustments to reconcile net income to net cash flows from operating activities:     
Depreciation and amortization688,150
 531,740
 365,648
Share-based compensation155,302
 136,293
 118,566
Deferred income taxes(308,222) (245,077) (116,900)
Other(50,320) (27,612) 28,822
Changes in operating assets and liabilities, net:     
Accounts receivable(512,389) (126,753) 3,571
Inventory(185,917) (243,960) (140,309)
Other assets(94,514) (160,188) (27,347)
Accrued expenses and other current liabilities244,378
 284,049
 273,372
Other liabilities and taxes payable94,779
 318,512
 34,112
Other(30,697) 15,733
 (39,671)
Net cash flows provided by operating activities2,942,115
 2,345,078
 1,879,897
Cash flows from investing activities:     
Proceeds from sales and maturities of marketable securities2,718,923
 5,190,052
 2,749,558
Purchases of marketable securities(3,583,150) (3,278,091) (3,334,434)
Acquisition of TYSABRI rights
 (3,262,719) 
Contingent consideration related to Fumapharm AG acquisition(375,000) (15,000) 
Acquisitions of businesses
 
 (72,401)
Purchases of property, plant and equipment(287,751) (246,281) (254,548)
Other(15,998) 7,371
 (38,517)
Net cash flows used in investing activities(1,542,976) (1,604,668) (950,342)
Cash flows from financing activities:     
Purchase of treasury stock(886,779) (400,309) (984,715)
Proceeds from issuance of stock for share-based compensation arrangements54,887
 66,770
 67,493
Excess tax benefit from share-based compensation96,376
 73,467
 54,738
Repayments of borrowings(2,674) (452,340) (2,428)
Other(17,683) (4,116) (12,566)
Net cash flows used in financing activities(755,873) (716,528) (877,478)
Net increase (decrease) in cash and cash equivalents643,266
 23,882
 52,077
Effect of exchange rate changes on cash and cash equivalents(40,904) 7,959
 4,102
Cash and cash equivalents, beginning of the year602,562
 570,721
 514,542
Cash and cash equivalents, end of the year$1,204,924
 $602,562
 $570,721






 For the Years Ended December 31,
 2016 2015 2014
Cash flows from operating activities:     
Net income$3,695.7
 $3,593.2
 $2,941.6
Adjustments to reconcile net income to net cash flows from operating activities:     
Depreciation and amortization682.7
 600.4
 688.1
Share-based compensation154.8
 161.4
 155.3
Deferred income taxes(175.0) (145.6) (308.2)
Other91.2
 82.2
 (50.3)
Changes in operating assets and liabilities, net:     
Accounts receivable(241.4) 29.0
 (512.4)
Due from anti-CD20 therapeutic programs13.9
 (31.1) (30.7)
Inventory(165.6) (174.4) (185.9)
Other assets59.1
 (127.0) (108.7)
Accrued expenses and other current liabilities570.1
 74.2
 244.3
Income tax assets and liabilities(232.6) (429.4) 40.3
Other liabilities69.5
 83.2
 68.7
Net cash flows provided by operating activities4,522.4
 3,716.1
 2,942.1
Cash flows from investing activities:     
Proceeds from sales and maturities of marketable securities7,378.9
 4,063.0
 2,718.9
Purchases of marketable securities(7,913.2) (6,864.9) (3,583.1)
Contingent consideration related to Fumapharm AG acquisition(1,200.0) (850.0) (375.0)
Acquisitions of businesses, net of cash acquired
 (198.8) 
Purchases of property, plant and equipment(616.1) (643.0) (287.8)
Acquisitions of intangible assets(111.6) (15.4) (28.2)
Other(22.8) (44.5) 12.2
Net cash flows used in investing activities(2,484.8) (4,553.6) (1,543.0)
Cash flows from financing activities:     
Purchases of treasury stock(1,000.0) (5,000.0) (886.8)
Proceeds from issuance of stock for share-based compensation arrangements43.7
 54.2
 54.9
Proceeds from borrowings
 5,930.5
 
Repayments of borrowings(2.7) (2.1) (2.7)
Excess tax benefit from share-based compensation12.6
 78.2
 96.4
Contingent consideration payments(38.6) (13.1) (20.5)
Other(2.8) (61.3) 2.8
Net cash flows provided by (used in) financing activities(987.8) 986.4
 (755.9)
Net increase in cash and cash equivalents1,049.8
 148.9
 643.2
Effect of exchange rate changes on cash and cash equivalents(31.3) (45.8) (40.9)
Cash and cash equivalents, beginning of the year1,308.0
 1,204.9
 602.6
Cash and cash equivalents, end of the year$2,326.5
 $1,308.0
 $1,204.9
See accompanying notes to these consolidated financial statements.

F- 5


BIOGEN IDEC INC. AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF EQUITY
(In thousands)millions)
 Preferred stock Common stock 
Additional
paid-in
capital
 
Accumulated
other
comprehensive
loss
 
Retained
earnings
 Treasury stock 
Total
Biogen Idec  Inc.
shareholders’
equity
 
Noncontrolling
interests
 
Total
equity
 Shares Amount Shares Amount    Shares Amount   
Balance, December 31, 2013
 $
 255,973
 $128
 $4,023,651
 $(27,745) $6,349,135
 (19,641) $(1,724,927) $8,620,242
 $596
 $8,620,838
Net income            2,934,784
     2,934,784
 6,781
 2,941,565
Other comprehensive income, net of tax          (31,743)       (31,743) 
 (31,743)
Distribution to noncontrolling interests                  
 (9,051) (9,051)
Other transactions with noncontrolling interests                  
 6,704
 6,704
Repurchase of common stock for Treasury pursuant to the 2011 share repurchase plan, at cost              (2,921) (886,779) (886,779)   (886,779)
Issuance of common stock under stock option and stock purchase plans    342
 
 54,887
         54,887
   54,887
Issuance of common stock under stock award plan    811
 1
 (140,353)         (140,352)   (140,352)
Compensation expense related to share-based payments        165,004
         165,004
   165,004
Tax benefit from share-based payments        92,967
         92,967
   92,967
Balance, December 31, 2014
 $
 257,126
 $129
 $4,196,156
 $(59,488) $9,283,919
 (22,562) $(2,611,706) $10,809,010
 $5,030
 $10,814,040
 Preferred stock Common stock 
Additional
paid-in
capital
 
Accumulated
other
comprehensive
loss
 
Retained
earnings
 Treasury stock 
Total
Biogen Inc.
shareholders’
equity
 
Noncontrolling
interests
 
Total
equity
 Shares Amount Shares Amount    Shares Amount   
Balance, December 31, 2015
 $
 241.2
 $0.1
 $
 $(224.0) $12,208.4
 (22.6) $(2,611.7) $9,372.8
 $2.1
 $9,374.9
Net income            3,702.8
     3,702.8
 (7.1) 3,695.7
Other comprehensive income (loss), net of tax          (95.9)       (95.9) 0.1
 (95.8)
Acquisition of noncontrolling interests                  
 (0.6) (0.6)
Capital contribution to noncontrolling interests                  
 1.5
 1.5
Deconsolidation of noncontrolling interests                  
 (7.5) (7.5)
Repurchase of common stock pursuant to the 2016 Share Repurchase Program, at cost              (3.3) (1,000.0) (1,000.0)   (1,000.0)
Retirement of common stock pursuant to the 2016 Share Repurchase Program, at cost    (3.3) 
 (164.9)   (835.1) 3.3
 1,000.0
 
   
Issuance of common stock under stock option and stock purchase plans    0.2
 
 43.7
   
     43.7
   43.7
Issuance of common stock under stock award plan    0.4
 
 (47.6)   (4.5)     (52.1)   (52.1)
Compensation expense related to share-based payments        169.4
         169.4
   169.4
Tax benefit from share-based payments        (0.6)         (0.6)   (0.6)
Balance, December 31, 2016
 $
 238.5
 $0.1
 $
 $(319.9) $15,071.6
 (22.6) $(2,611.7) $12,140.1
 $(11.5) $12,128.6



See accompanying notes to these consolidated financial statements.

BIOGEN INC. AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF EQUITY - (Continued)
(In millions)
 Preferred stock Common stock 
Additional
paid-in
capital
 
Accumulated
other
comprehensive
loss
 
Retained
earnings
 Treasury stock 
Total
Biogen Inc.
shareholders’
equity
 
Noncontrolling
interests
 
Total
equity
 Shares Amount Shares Amount    Shares Amount   
Balance, December 31, 2014
 $
 257.1
 $0.1
 $4,196.2
 $(59.5) $9,283.9
 (22.6) $(2,611.7) $10,809.0
 $5.0
 $10,814.0
Net income            3,547.0
     3,547.0
 46.2
 3,593.2
Other comprehensive income (loss), net of tax          (164.5)       (164.5) 
 (164.5)
Distribution to noncontrolling interests                  
 (60.0) (60.0)
Acquisition of noncontrolling interests                  
 10.9
 10.9
Repurchase of common stock pursuant to the 2015 Share Repurchase Program, at cost              (16.8) (5,000.0) (5,000.0)   (5,000.0)
Retirement of common stock pursuant to the 2015 Share Repurchase Program, at cost    (16.8) 
 (4,377.5)   (622.5) 16.8
 5,000.0
 
   
Issuance of common stock under stock option and stock purchase plans    0.3
 
 54.2
         54.2
   54.2
Issuance of common stock under stock award plan    0.6
 
 (125.1)         (125.1)   (125.1)
Compensation expense related to share-based payments        183.2
         183.2
   183.2
Tax benefit from share-based payments        69.0
         69.0
   69.0
Balance, December 31, 2015
 $
 241.2
 $0.1
 $
 $(224.0) $12,208.4
 (22.6) $(2,611.7) $9,372.8
 $2.1
 $9,374.9





See accompanying notes to these consolidated financial statements.

BIOGEN INC. AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF EQUITY - (Continued)
(In millions)
 Preferred stock Common stock 
Additional
paid-in
capital
 
Accumulated
other
comprehensive
loss
 
Retained
earnings
 Treasury stock 
Total
Biogen Inc.
shareholders’
equity
 
Noncontrolling
interests
 
Total
equity
 Shares Amount Shares Amount    Shares Amount   
Balance, December 31, 2013
 $
 256.0
 $0.1
 $4,023.6
 $(27.7) $6,349.1
 (19.7) $(1,724.9) $8,620.2
 $0.6
 $8,620.8
Net income            2,934.8
     2,934.8
 6.8
 2,941.6
Other comprehensive income (loss), net of tax          (31.8)       (31.8) 
 (31.8)
Distribution to noncontrolling interests                  
 (9.1) (9.1)
Other transactions with noncontrolling interests                  
 6.7
 6.7
Repurchase of common stock for Treasury pursuant to the 2011 Share Repurchase Program, at cost              (2.9) (886.8) (886.8)   (886.8)
Issuance of common stock under stock option and stock purchase plans    0.3
 
 54.9
         54.9
   54.9
Issuance of common stock under stock award plan    0.8
 
 (140.3)         (140.3)   (140.3)
Compensation expense related to share-based payments        165.0
         165.0
   165.0
Tax benefit from share-based payments        93.0
         93.0
   93.0
Balance, December 31, 2014
 $
 257.1
 $0.1
 $4,196.2
 $(59.5) $9,283.9
 (22.6) $(2,611.7) $10,809.0
 $5.0
 $10,814.0








See accompanying notes to these consolidated financial statements.

F- 6


BIOGEN IDEC INC. AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF EQUITY - (Continued)
(In thousands)
 Preferred stock Common stock 
Additional
paid-in
capital
 
Accumulated
other
comprehensive
loss
 
Retained
earnings
 Treasury stock 
Total
Biogen Idec  Inc.
shareholders’
equity
 
Noncontrolling
interests
 
Total
equity
 Shares Amount Shares Amount    Shares Amount   
Balance, December 31, 2012
 $
 254,237
 $127
 $3,854,525
 $(55,305) $4,486,794
 (17,655) $(1,324,618) $6,961,523
 $2,272
 $6,963,795
Net income            1,862,341
     1,862,341
 
 1,862,341
Other comprehensive income, net of tax          27,560
       27,560
 
 27,560
Deconsolidation of noncontrolling interests                  
 (1,676) (1,676)
Repurchase of common stock for Treasury pursuant to the 2011 share repurchase plan, at cost              (1,986) (400,309) (400,309)   (400,309)
Issuance of common stock under stock option and stock purchase plans    767
 
 66,770
         66,770
   66,770
Issuance of common stock under stock award plan    969
 1
 (89,747)         (89,746)   (89,746)
Compensation expense related to share-based payments        146,210
         146,210
   146,210
Tax benefit from share-based payments        45,893
         45,893
   45,893
Balance, December 31, 2013
 $
 255,973
 $128
 $4,023,651
 $(27,745) $6,349,135
 (19,641) $(1,724,927) $8,620,242
 $596
 $8,620,838
















See accompanying notes to these consolidated financial statements.

F- 7


BIOGEN IDEC INC. AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF EQUITY - (Continued)
(In thousands)
 Preferred stock Common stock 
Additional
paid-in
capital
 
Accumulated
other
comprehensive
loss
 
Retained
earnings
 Treasury stock 
Total
Biogen Idec  Inc.
shareholders’
equity
 
Noncontrolling
interests
 
Total
equity
 Shares Amount Shares Amount    Shares Amount   
Balance, December 31, 2011
 $
 255,633
 $128
 $4,185,048
 $(26,535) $3,106,761
 (13,518) $(839,903) $6,425,499
 $1,488
 $6,426,987
Net income            1,380,033
     1,380,033
 
 1,380,033
Other comprehensive income, net of tax          (28,770)       (28,770) 65
 (28,705)
Distributions to noncontrolling interests                  
 1,199
 1,199
Capital contributions from noncontrolling interests                  
 73
 73
Deconsolidation of noncontrolling interests        (3)         (3) (553) (556)
Repurchase of common stock for Treasury pursuant to the 2011 share repurchase plan, at cost              (7,811) (984,715) (984,715)   (984,715)
Retirement of common stock pursuant to the 2011 share repurchase plan, at cost    (3,674) (2) (499,998)     3,674
 500,000
 
   
Issuance of common stock under stock option and stock purchase plans    1,039
 
 67,493
         67,493
   67,493
Issuance of common stock under stock award plan    1,239
 1
 (71,358)         (71,357)   (71,357)
Compensation expense related to share-based payments        123,956
         123,956
   123,956
Tax benefit from share-based payments        49,387
         49,387
   49,387
Balance, December 31, 2012
 $
 254,237
 $127
 $3,854,525
 $(55,305) $4,486,794
 (17,655) $(1,324,618) $6,961,523
 $2,272
 $6,963,795









See accompanying notes to these consolidated financial statements.

F- 8

BIOGEN IDEC INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS




1.Summary of Significant Accounting Policies
1.     Summary of Significant Accounting Policies
Business Overview
Biogen Idec is a global biopharmaceutical company focused on discovering, developing, manufacturing and delivering therapies forto people living with serious neurological, rare and autoimmune and hematologic disorders. diseases.
Our principal marketed products include TECFIDERA, AVONEX, PLEGRIDY, TECFIDERA, TYSABRI, ZINBRYTA and FAMPYRA for multiple sclerosis (MS), ALPROLIXFUMADERM for hemophilia Bthe treatment of severe plaque psoriasis and ELOCTATESPINRAZA for hemophilia A.the treatment of spinal muscular atrophy (SMA). We also collaborate on the developmenthave certain business and commercialization offinancial rights with respect to RITUXAN for the treatment of non-Hodgkin's lymphoma, chronic lymphocytic leukemia (CLL) and other conditions, and share profits and losses for GAZYVA which is approvedindicated for the treatment of chronic lymphocytic leukemia.CLL and follicular lymphoma, and other potential anti-CD20 therapies under a collaboration agreement with Genentech, Inc. (Genentech), a wholly-owned member of the Roche Group (Roche Group).
We support our drug discovery and development efforts through the commitment of significant resources to discovery, research and development programs and business development opportunities, particularly within areas of our scientific, manufacturing and technical capabilities. Our research is currently focused on additional improvements in the treatment of MS, solving some of the most challenging and complex diseases, including Alzheimer's disease, Parkinson's disease and amyotrophic lateral sclerosis (ALS), and employing innovative technologies to discover potential treatments for rare and genetic disorders, including new ways of treating diseases through gene therapy.
Our innovative drug development and commercialization activities are complemented by our biosimilar therapies that expand access to medicines and reduce the cost burden for healthcare systems. We are leveraging our manufacturing capabilities and know-how to develop, manufacture and market biosimilars through Samsung Bioepis, our joint venture with Samsung BioLogics Co. Ltd. (Samsung Biologics). Under this agreement, we are currently manufacturing and commercializing BENEPALI, an etanercept biosimilar referencing ENBREL, and FLIXABI, an infliximab biosimilar referencing REMICADE, in the European Union (E.U.).
Hemophilia Spin-Off
In May 2016 we announced our intention to spin off our hemophilia business, Bioverativ Inc. (Bioverativ), as an independent, publicly traded company. Bioverativ, will focus on the discovery, development and commercialization of therapies for treatment of hemophilia and other blood disorders, including ELOCTATE for the treatment of hemophilia A and ALPROLIX for the treatment of hemophilia B. Bioverativ will also assume all of our rights and obligations under our collaboration agreement with Swedish Orphan Biovitrum AB (Sobi) and our collaboration and license agreement with Sangamo Biosciences Inc. (Sangamo).
On February 1, 2017, we completed the distribution of all the then outstanding shares of common stock of Bioverativ to Biogen stockholders, who received one share of Bioverativ common stock for every two shares of Biogen common stock. As a result of the distribution, Bioverativ is now an independent public company whose shares of common stock are trading under the symbol "BIVV" on the Nasdaq Global Select Market.
The financial results of Bioverativ are reflected in our consolidated results of operations and financial position included in these audited consolidated financial statements for the periods presented in this Form 10-K. The financial results of Bioverativ will be excluded from our consolidated results of operations and financial position commencing February 1, 2017. For additional information regarding the separation of Bioverativ, please read Note 26, Subsequent Events to these consolidated financial statements.
Consolidation
Our consolidated financial statements reflect our financial statements, those of our wholly-owned subsidiaries and those of certain variable interest entities where we are the primary beneficiary. For consolidated entities where we own or are exposed to less than 100% of the economics, we record net income (loss) attributable to noncontrolling interests in our consolidated statements of income equal to the percentage of the economic or ownership interest retained in such entities by the respective noncontrolling parties. Intercompany balances and transactions are eliminated in consolidation.
In determining whether we are the primary beneficiary of an entity, and therefore required to consolidate, we apply a qualitative approach that determines whether we have both (1) the power to direct the economically significant activities of the entity and (2)

F- 9

BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

the obligation to absorb losses of, or the right to receive benefits from, the entity that could potentially be significant to that entity. These considerations impact the way we account for our existing collaborative relationships and other arrangements. We continuously assess whether we are the primary beneficiary of a variable interest entity as changes to existing relationships or future transactions may result in us consolidating or deconsolidating one or more of our collaborators or partners.
Use of Estimates
The preparation of our consolidated financial statements requires us to make estimates, judgments and assumptions that may affect the reported amounts of assets, liabilities, equity, revenues and expenses and related disclosure of contingent assets and liabilities. On an on-going basis we evaluate our estimates, and judgments and methodologies. We base our estimates on historical experience and on various other assumptions that are believedwe believe to be reasonable, the results of which form the basis for making judgments about the carrying values of assets, liabilities and liabilities.equity and the amount of revenues and expenses. Actual results may differ from these estimates under different assumptions or conditions.
Revenue Recognition
We recognize revenue when all of the following criteria are met: persuasive evidence of an arrangement exists; delivery has occurred or services have been rendered; our price to the customer is fixed or determinable; and collectability is reasonably assured.
Product Revenues
Revenues from product sales are recognized when title and risk of loss have passed to the customer, which is typically upon delivery. Product revenues are recorded net of applicable reserves for discounts and allowances.
Reserves for Discounts and Allowances
We establishRevenues from product sales are recorded net of reserves established for trade termapplicable discounts wholesaler incentives, Medicaid rebates, Veterans Administration (VA) and Public Health Service (PHS) discounts, managed care rebates, product returns and other governmental rebates or applicable allowances, including those associated with the implementation of pricing actions in certain of the international markets in which we operate. Reserves established for these discountsThese reserves are based on estimates of the amounts earned or to be claimed on the related sales and allowances are classified as reductions of accounts receivable (if the amount is payable to our customer) or a liability (if the amount is payable to a party other than our customer). These reserves are based on estimates of the amounts earned or to be claimed on the related sales. Our estimates take into consideration our historical experience, current contractual and statutory requirements, specific known market events and trends, industry datedata and forecasted customer buying and payment patterns. Actual amounts may ultimately differ from our estimates. If actual results vary, we adjust these estimates, which could have an effect on earnings in the period of adjustment.
Product revenue reserves are categorized as follows: discounts, contractual adjustments and returns.

F- 9

BIOGEN IDEC INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


Discounts include trade term discounts and wholesaler incentives. Trade term discounts and wholesaler incentives primarily relate to estimated obligations for credits to be granted to wholesalers for remitting payment on their purchases within established incentive periods and credits to be granted to wholesalers for compliance with various contractually-defined inventory management practices, respectively. We determine these reserves based on our historical experience, including the timing of customer payments.
Contractual adjustments primarily relate to Medicaid and managed care rebates, VAco-payment (copay) assistance, Veterans Administration (VA) and PHSPublic Health Service (PHS) discounts, specialty pharmacy program fees and other governmental rebates or applicable allowances.
Medicaid rebates relate to our estimated obligations to states under established reimbursement arrangements. Rebate accruals are recorded in the same period the related revenue is recognized, resulting in a reduction of product revenue and the establishment of a liability which is included in other current liabilities. Our liability for Medicaid rebates consists of estimates for claims that a state will make for the current quarter, claims for prior quarters that have been estimated for which an invoice has not been received, invoices received for claims from the prior quarters that have not been paid, and an estimate of potential claims that will be made for inventory that exists in the distribution channel at period end.
Governmental rebates or chargebacks, including VA and PHS discounts, represent our estimated obligations resulting from contractual commitments to sell products to qualified healthcare providers at prices lower than the list prices we charge to wholesalers which provide those products. The wholesaler charges us for the

F- 10

BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

difference between what the wholesaler pays for the products and the ultimate selling price to the qualified healthcare providers. Rebate and chargeback reserves are established in the same period as the related revenue is recognized, resulting in a reduction in product revenue and accounts receivable. Chargeback amounts are generally determined at the time of resale to the qualified healthcare provider from the wholesaler, and we generally issue credits for such amounts within a few weeks of the wholesaler notifying us about the resale. Our reserves for VA, PHS and chargebacks consistsconsist of amounts that we expect to issue for inventory that exists at the wholesalers that we expect will be sold to qualified healthcare providers and chargebacks that wholesalers have claimed for which we have not issued a credit.
Managed care rebates represent our estimated obligations to third parties, primarily pharmacy benefit managers. Rebate accruals are recorded in the same period the related revenue is recognized, resulting in a reduction of product revenue and the establishment of a liability which is included in accrued expenses and other current liabilities. These rebates result from performance-based goals, that are primarily based on attaining contractually specified sales volumes and growthformulary position and price increase limit allowances (price protection). The calculation of the accrual for these rebates is based on an estimate of the customer’s buying patterns and the resulting applicable contractual rebate rate(s) to be earned over a contractual period.
Copay assistance represents financial assistance to qualified patients, assisting them with prescription drug co-payments required by insurance. The calculation of the accrual for copay is based on an estimate of claims and the cost per claim that we expect to receive associated with inventory that exists in the distribution channel at period end.
Other governmental rebates or applicable allowances primarily relate to mandatory rebates and discounts in international markets where government-sponsored healthcare systems are the primary payors for healthcare.
Product returns are established for returns expected to be made by wholesalers and are recorded in the period the related revenue is recognized, resulting in a reduction to product sales. In accordance with contractual terms, wholesalers are permitted to return product for reasons such as damaged or expired product. The majority of wholesaler returns are due to product expiration. Expired product return reserves are estimated through a comparison of historical return data to their related sales on a production lot basis. Historical rates of return are determined for each product and are adjusted for known or expected changes in the marketplace specific to each product.
In addition to the discounts, rebates and product returns described above and classified as a reduction of revenue, we also maintain certain customer service contracts with distributors and other customers in the distribution channel that provide us with inventory management, data and distribution services.services, which are generally reflected as a reduction of revenue. To the extent we can demonstrate a separable benefit and fair value for these services, we classify these payments withinin selling, general and administrative expenses.
We also distribute no-charge product to qualifying patients under our patient assistance and patient replacement goods program. This program is administered through our distribution partners, which ship product for qualifying patientsRevenues from their own inventory received from us. Gross revenue and the related reserves are not recorded on product shipped under this program and cost of sales is recorded when the product is shipped.Anti-CD20 Therapeutic Programs

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


Revenues from Unconsolidated Joint Businessanti-CD20 therapeutic programs consist of:
Revenues from unconsolidated joint business consists of
(i) our share of pre-tax profits and losses in the U.S. for RITUXAN and GAZYVA;
(ii) reimbursement of our selling and development expenses in the U.S. for RITUXAN; and
(iii) revenues on sales in the rest of world for RITUXAN, which consist of our share of pre-tax co-promotion profits on RITUXAN in Canada and royalty revenue on RITUXAN sales outside the U.S. and Canada by the Roche Group and its sublicensees.
Pre-tax co-promotion profits on RITUXAN and GAZYVA are calculated and paid to us by Genentech in the U.S. for RITUXAN and GAZYVA; (ii) reimbursement of our selling and development expenses in the U.S. for RITUXAN; and (iii) revenue on sales in the rest of world for RITUXAN, which consist of our share of pre-tax co-promotion profits in Canada and royalty revenue on sales outside the U.S. and Canada by F. Hoffmann-La Roche Ltd. (Roche) and its sublicensees. Pre-tax co-promotion profits on RITUXAN are calculated and paid to us by Genentech in the U.S. and by Roche Group in Canada. Pre-tax co-promotion profits consist of U.S. and Canadian net sales to third-party customers less the costapplicable costs to manufacture, third-party royalty expenses, distribution, selling and marketing expenses, and joint development expenses incurred by Genentech, the Roche Group and us. We record our share of the pretaxpre-tax co-promotion profits on RITUXAN in Canada and royalty revenues on RITUXAN sales outside the U.S. on a cash basis as we do not have the ability to estimate these profits or royalty revenue in the period incurred. Additionally, ourOur share of the pre-tax profits on RITUXAN and GAZYVA in the U.S. includes estimates made by Genentech and those estimates are subject to change. Actual results may ultimately differ from our estimates. For additional information related to our collaboration with Genentech, please read Note 20,19, Collaborative and Other Relationships, to these consolidated financial statements.

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Royalty Revenues
We receive royalty revenues on sales by our licensees of other products covered under patents that we own. We do not have future performance obligations under these license arrangements. We record these revenues based on estimates of the sales that occurred during the relevant period.period as a component of other revenues. The relevant period estimates of sales are based on interim data provided by licensees and analysis of historical royalties that have been paid to us, adjusted for any changes in facts and circumstances, as appropriate. Differences between actual and estimated royalty revenues are adjusted for in the period in which they become known, typically the following quarter. Historically, adjustments have not been material when compared to actual amounts paid by licensees. If we are unable to reasonably estimate royalty revenue or do not have access to the information, then we record royalty revenues on a cash basis.
Multiple-Element Revenue Arrangements
We may enter into transactions that involve the sale of products and related services under multiple element arrangements. In accounting for these transactions, we assess the elements of the contract and whether each element has standalone value and allocate revenue to the various elements based on their estimated selling price.price as a component of total revenues. The selling price of a revenue generating element can be based on current selling prices offered by us or another party for current products or management’s best estimate of a selling price. Revenue allocated to an individual element is recognized when all other revenue recognition criteria are met for that element.
Collaborative and Other Relationships
Our development and commercialization arrangements with Sobi and AbbVie Inc. (AbbVie) represent collaborative arrangements as each party is an active participant and exposed to significant risks and rewards of the arrangements. Where we are the principal on sales transactions with third parties, we recognize revenue, cost of sales and operating expenses on a gross basis in their respective lines in our consolidated statements of income. Where we are not the principal on sales transactions with third parties, we record our share of the revenues, cost of sales and operating expenses on a net basis in collaborative and other relationships included in other revenue in our consolidated statements of income.
For additional information related to our collaborations with Sobi and AbbVie, please read Note 19, Collaborative and Other Relationships, to these consolidated financial statements.
Fair Value Measurements
We have certain financial assets and liabilities recorded at fair value which have been classified as Level 1, 2 or 3 within the fair value hierarchy as described in the accounting standards for fair value measurements.
Level 1 — Fair values are determined utilizing quoted prices (unadjusted) in active markets for identical assets or liabilities that we have the ability to access;
Level 2 — Fair values are determined by utilizing quoted prices for identical or similar assets and liabilities in active markets or other market observable inputs such as interest rates, yield curves and foreign currency spot rates; and
Level 3 — Prices or valuations that require inputs that are both significant to the fair value measurement and unobservable.
The majority of our financial assets have been classified as Level 2. Our financial assets (which include our cash equivalents, derivative contracts, marketable debt securities and plan assets for deferred compensation) have been initially valued at the transaction price and subsequently valued, at the end of each reporting period, utilizing third partythird-party pricing services or other market observable data. The pricing services utilize industry standard valuation models, including both income and market basedmarket-based approaches and observable market inputs to determine value. These observable market inputs include reportable trades, benchmark yields, credit spreads, broker/dealer quotes, bids, offers, current spot rates and other industry and economic events.
We validate the prices provided by our third partythird-party pricing services by reviewing their pricing methods and matrices, obtaining market values from other pricing sources and analyzing pricing data in certain instances. After completing our validation procedures, we did not adjust or override any fair value measurements provided by our pricing services as of December 31, 20142016 and 2013,2015, respectively.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


We also maintain venture capital investments classified as Level 3 whose fair value is initially measured at transaction pricesOther Assets and subsequently valued using the pricing of recent financing or by reviewing the underlying economic fundamentals and liquidation value of the companies. These investments include investments in certain venture capital funds which primarily invest in small privately-owned, venture-backed biotechnology companies. The fair value of our investments in these venture capital funds has been estimated using the net asset value of the fund. Gains and losses (realized and unrealized) included in earnings for the period are reported in other income (expense), net. The investments cannot be redeemed within the funds. Distributions from each fund will be received as the underlying investments of the fund are liquidated. We apply judgments and estimates when we validate the prices provided by third parties. While we believe the valuation methodologies are appropriate, the use of valuation methodologies is highly judgmental and changes in methodologies can have a material impact on our results of operations.
OtherLiabilities
The carrying amounts reflected in the consolidated balance sheets for cash equivalents, current accounts receivable, due from unconsolidated joint business,anti-CD20 therapeutic programs, other current assets, accounts payable and accrued expenses and other, approximate fair value due to their short-term maturities.
Cash and Cash Equivalents
We consider only those investments which are highly liquid, readily convertible to cash and that mature within three months from date of purchase to be cash equivalents. As of December 31, 20142016 and 2013,2015, cash equivalents were comprised of money market funds and commercial paper, overnight reverse repurchase agreements and other debt securities with maturities less than 90 days from the date of purchase.
Accounts Receivable
The majority of our accounts receivable arise from product sales and primarily represent amounts due from our wholesale distributors, public hospitals and other government entities. We monitor the financial performance and creditworthiness of our large customers so that we can properly assess and respond to changes in their credit profile. We provide reserves against trade receivables for estimated losses that may result from a customer’s inability to pay. Amounts determined to be uncollectible are charged or written-off against the reserve. To date, our historical reserves and write-offs of accounts receivable have not been significant.
In countries where we have experienced a pattern of payments extending beyond our contractual payment term and we expect to collect receivables greater than one year from the time of sale, we have discounted our receivables and reduced related revenues over the period of time that we estimate those amounts will be paid using the country’s market-based borrowing rate for such period. The related receivables are classified at the time of sale as non-current assets. We accrete interest income on these receivables, which is recognized as a component of other income (expense), net withinin our consolidated statementstatements of income.
Concentration of Credit Risk
Financial instruments that potentially subject us to concentrations of credit risk include cash and cash equivalents, investments, derivatives and accounts receivable. We attempt to minimize the risks related to cash and cash equivalents and investments by investing in a broad and diverse range of financial instruments as previously defined by us. We have established guidelines related to credit ratings and maturities intended to safeguard principal balances and maintain liquidity. Our investment portfolio is maintained in accordance with our investment policy, which defines allowable investments, specifies credit quality standards and limits the credit exposure of any single issuer. We minimize credit risk resulting from derivative instruments by choosing only highly rated financial institutions as counterparties.
Concentrations of credit risk with respect to receivables, which are typically unsecured, are limitedsomewhat mitigated due to the wide variety of customers and markets using our products, as well as their dispersion across many different geographic areas. The majority of our accounts receivable arise from product sales in the United StatesU.S. and Europe and have standard payment terms which generally require payment within 30 to 90 days.days. We monitor the financial performance and creditworthiness of our large customers so that we can properly assess and respond to changes in their credit profile. We continue to monitor these conditions and assess their possible impact on our business. For additional information related to this concentration of credit risk, please read Note 4, Accounts Receivable to these consolidated financial statements.
As of December 31, 20142016 and 2013,2015, two wholesale distributors individually accounted for approximately 34.4%37.2% and 23.3%19.2%, and 34.5%35.4% and 15.7%23.1%, of consolidated trade receivables,accounts receivable, net, respectively.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


Marketable Securities and Other Investments
Marketable Debt Securities
Available-for-sale debt securities are recorded at fair market value and unrealized gains and losses are included in accumulated other comprehensive income (loss) in equity, net of related tax effects, unless the security has experienced a credit loss, we have determined that we have the intent to sell the security or we have determined that it is more likely than not that we will have to sell the security before its expected recovery. Realized gains and losses are reported in other income (expense), net, on a specific identification basis.

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Marketable Equity Securities
Our marketable equity securities represent investments in publicly traded equity securities and are included in investments and other assets withinin our consolidated balance sheet. When assessing whether a decline in the fair value of a marketable equity security is other-than-temporary, we consider the fair market value of the security, the duration of the security’s decline and prospects for the underlying business, including favorable or adverse clinical trial results, new product initiatives and new collaborative agreements with the companies in which we have invested.
Non-Marketable Equity Securities
We also invest in equity securities of companies whose securities are not publicly traded and where fair value is not readily available. These investments are recorded using either the cost method or the equity method of accounting, depending on our ownership percentage and other factors that suggest we have significant influence. We monitor these investments to evaluate whether any decline in their value has occurred that would be other-than-temporary, based on the implied value of recent company financings, public market prices of comparable companies and general market conditions and are included in investments and other assets withinin our consolidated balance sheet.
Evaluating Investments for Other-than-Temporary Impairments
We conduct periodic reviews to identify and evaluate each investment that has an unrealized loss, in accordance with the meaning of other-than-temporary impairment and its application to certain investments. An unrealized loss exists when the current fair value of an individual security is less than its amortized cost basis. Unrealized losses on available-for-sale securities that are determined to be temporary, and not related to credit loss, are recorded, net of tax, in accumulated other comprehensive income.
For available-for-sale debt securities with unrealized losses, management performs an analysis to assess whether we intend to sell or whether we would more likely than not be required to sell the security before the expected recovery of the amortized cost basis. Where we intend to sell a security, or may be required to do so, the security’s decline in fair value is deemed to be other-than-temporary and the full amount of the unrealized loss is reflected withinin earnings as an impairment loss.
Regardless of our intent to sell a security, we perform additional analysis on all securities with unrealized losses to evaluate losses associated with the creditworthiness of the security. Credit losses are identified where we do not expect to receive cash flows sufficient to recover the amortized cost basis of a security.
For equity securities, when assessing whether a decline in value is other-than-temporary, we consider the fair market value of the security, the duration of the security’s decline, and the financial condition of the issuer. We then consider our intent and ability to hold the equity security for a period of time sufficient to recover our carrying value. Where we have determined that we lack the intent and ability to hold an equity security to its expected recovery, the security’s decline in fair value is deemed to be other-than-temporary and is reflected withinin earnings as an impairment loss.
Equity Method of Accounting
In circumstances where we have the ability to exercise significant influence over the operating and financial policies of a company in which we have an investment, we utilize the equity method of accounting for recording investment activity. In assessing whether we exercise significant influence, we consider the nature and magnitude of our investment, the voting and protective rights we hold, any participation in the governance of the other company, and other relevant factors such as the presence of a collaboration or other business relationship. Under the equity method of accounting, we record withinin our results of operations our share of income or loss of the other company.

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Table If our share of Contentslosses exceeds the carrying value of our investment, we will suspend recognizing additional losses and will continue to do so unless we commit to providing additional funding.
BIOGEN IDEC INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


Inventory
Inventories are stated at the lower of cost or market with cost determined in a manner that approximatesbased on the first-in, first-out (FIFO) method. We classify our inventory costs as long-term when we expect to utilize the inventory beyond our normal operating cycle and include these costs in investments and other assets in our consolidated balance sheets. Inventory that can be used in either the production of clinical or commercial products is expensed as research and development costs when selectedidentified for use in a clinical manufacturing campaign.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Capitalization of Inventory Costs
We capitalize inventory costs associated with our products prior to regulatory approval, when, based on management’s judgment, future commercialization is considered probable and the future economic benefit is expected to be realized. We consider numerous attributes in evaluating whether the costs to manufacture a particular product should be capitalized as an asset. We assess the regulatory approval process and where the particular product stands in relation to that approval process, including any known safety or efficacy concerns, potential labeling restrictions and other impediments to approval. We evaluate our anticipated research and development initiatives and constraints relating to the product and the indication in which it will be used. We consider our manufacturing environment including our supply chain in determining logistical constraints that could hamper approval or commercialization. We consider the shelf life of the product in relation to the expected timeline for approval and we consider patent related or contract issues that may prevent or delay commercialization. We also base our judgment on the viability of commercialization, trends in the marketplace and market acceptance criteria. Finally, we consider the reimbursement strategies that may prevail with respect to the product and assess the economic benefit that we are likely to realize. We expense previously capitalized costs related to pre-approval inventory upon a change in such judgment, due to, among other potential factors, a denial or significant delay of approval by necessary regulatory bodies.
Obsolescence and Unmarketable Inventory
We periodically review our inventories for excess or obsolescence and write-down obsolete or otherwise unmarketable inventory to its estimated net realizable value. If the actual net realizable value is less than that estimated by us, or if it is determined that inventory utilization will further diminish based on estimates of demand, additional inventory write-downs may be required. Additionally, our products are subject to strict quality control and monitoring which we perform throughout the manufacturing process. In the event that certain batches or units of product no longer meet quality specifications, we will record a charge to cost of sales to write-down any unmarketable inventory to its estimated net realizable value. In all cases, product inventory is carried at the lower of cost or its estimated net realizable value. Amounts written-down due to unmarketable inventory are charged to cost of sales.
Property, Plant and Equipment
Property, plant and equipment are carried at cost, subject to review for impairment whenever events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable. The cost of normal, recurring, or periodic repairs and maintenance activities related to property, plant and equipment are expensed as incurred. The cost for planned major maintenance activities, including the related acquisition or construction of assets, is capitalized if the repair will result in future economic benefits.
Interest costs incurred during the construction of major capital projects are capitalized until the underlying asset is ready for its intended use, at which point the interest costs are amortized as depreciation expense over the life of the underlying asset. We also capitalize certain direct and incremental costs associated with the validation effort required for licensing by regulatory agencies of new manufacturing equipment for the production of a commercially approved drug. These costs primarily include direct labor and material and are incurred in preparing the equipment for its intended use. The validation costs are either amortized over the life of the related equipment or expensed as cost of sales when the product produced in the validation process is sold.
In addition, we capitalize certain internal use computer software development costs. If the software is an integral part of production assets, these costs are included in machinery and equipment and are amortized on a straight-line basis over the estimated useful lives of the related software, which generally range from three to five years.years.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


We generally depreciate or amortize the cost of our property, plant and equipment using the straight-line method over the estimated useful lives of the respective assets, which are summarized as follows:
Asset CategoryUseful Lives
LandNot depreciated
Buildings15 to 40 years
Leasehold ImprovementsLesser of the useful life or the term of the respective lease
Furniture and Fixtures5 to 7 years
Machinery and Equipment5 to 20 years
Computer Software and Hardware3 to 5 years
When we dispose of property, plant and equipment, we remove the associated cost and accumulated depreciation from the related accounts on our consolidated balance sheet and include any resulting gain or loss in our consolidated statement of income.
Intangible Assets
Our intangible assets consist of acquired and in-licensed rights and patents, developed technology, out-licensed patents, in-process research and development acquired after January 1, 2009, trademarks and trade names. Our intangible assets are recorded at fair value at the time of their acquisition and are stated withinin our consolidated balance sheets net of accumulated amortization and impairments, if applicable.
Intangible assets related to acquired and in-licensed rights and patents, developed technology and out-licensed patents are amortized over their estimated useful lives using the economic consumption method if anticipated future revenues can be reasonably estimated. The straight-line method is used when revenues cannot be reasonably estimated. Amortization is recorded as amortization of acquired intangible assets withinin our consolidated statements of income.
Acquired and in-licensed rights and patents primarily relate to our acquisition of all remaining rights to TYSABRI from Elan Pharma International, Ltd (Elan), an affiliate of Elan Corporation, plc. Developed technology primarily relates to our AVONEX product, which was recorded in connection with the merger of Biogen, Inc. and IDEC Pharmaceuticals Corporation in 2003. We amortize the intangible assets related to TYSABRI and AVONEX using the economic consumption method based on revenue generated from the products underlying the related intangible assets. An analysis of the anticipated lifetime revenues of TYSABRI and AVONEX is performed annually during our long range planning cycle, which is generally updated in the third quarter of each year, and whenever events or changes in circumstances would significantly affect the anticipated lifetime revenues of TYSABRI or AVONEX.
Intangible assets related to trademarks, trade names and in-process research and development prior to commercialization are not amortized because they have indefinite lives,lives; however, they are subject to review for impairment. We review our intangible assets with indefinite lives for impairment annually, as of October 31, and whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable.
Acquired In-process Research and Development (IPR&D)
Acquired IPR&D represents the fair value assigned to research and development assets that have not reached technological feasibility. The value assigned to acquired IPR&D is determined by estimating the costs to develop the acquired technology into commercially viable products, estimating the resulting revenue from the projects and discounting the net cash flows to present value. The revenue and costs projections used to value acquired IPR&D are, as applicable, reduced based on the probability of success of developing a new drug. Additionally, the projections consider the relevant market sizes and growth factors, expected trends in technology and the nature and expected timing of new product introductions by us and our competitors. The rates utilized to discount the net cash flows to their present value are commensurate with the stage of development of the projects and uncertainties in the economic estimates used in the projections. Upon the acquisition of IPR&D, we complete an assessment of whether our acquisition constitutes the purchase of a single asset or a group of assets. We consider multiple factors in this assessment, including the nature of the technology acquired, the presence or absence of separate cash flows, the development process and stage of completion, quantitative significance and our rationale for entering into the transaction.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


If we acquire a business as defined under applicable accounting standards, then the acquired IPR&D is capitalized as an intangible asset. If we acquire an asset or group of assets that do not meet the definition of a business, then the acquired IPR&D is expensed on its acquisition date. Future costs to develop these assets are recorded to research and development expense as they are incurred.
We review amounts capitalized as acquired IPR&D for impairment at least annually, as of October 31, and whenever events or changes in circumstances indicate that the carrying value of the assets might not be recoverable.
When performing our impairment assessment, we calculate the fair value using the same methodology as described above. If the carrying value of our acquired IPR&D exceeds its fair value, then the intangible asset is written-down to its fair value. Certain IPR&D programs have a fair value that is not significantly in excess of carrying value, including our program for the treatment of trigeminal neuralgia (TGN). Such programs could become impaired if assumptions used in determining the fair value change.
Goodwill
Goodwill represents the difference between the purchase price and the fair value of the identifiable tangible and intangible net assets when accounted for using the purchase method of accounting. Goodwill is not amortized, but reviewed for impairment. Goodwill is reviewed annually, as of October 31, and whenever events or changes in circumstances indicate that the carrying value of the goodwill might not be recoverable.
We compare the fair value of our reporting unit to its carrying value. If the carrying value of the net assets assigned to the reporting unit exceeds the fair value of our reporting unit, then we would need to determine the implied fair value of our reporting unit’s goodwill. If the carrying value of our reporting unit’s goodwill exceeds its implied fair value, then we would record an impairment loss equal to the difference. As described in Note 25,24, Segment Information to these consolidated financial statements, we operate in one operating segment which we consider our only reporting unit.
Impairment of Long-Lived Assets
Long-lived assets to be held and used, including property, plant and equipment and definite-lived intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets or asset group may not be recoverable.
Determination of recoverability is based on an estimate of undiscounted future cash flows resulting from the use of the asset and its eventual disposition. In the event that such cash flows are not expected to be sufficient to recover the carrying amount of the assets, the assets are written-down to their fair values. Long-lived assets to be disposed of are carried at fair value less costs to sell.
Contingent Consideration
The consideration for our acquisitions often includes future payments that are contingent upon the occurrence of a particular event. For acquisitions completed before January 1, 2009, we record contingent consideration resulting from a business combination when the contingency is resolved. For acquisitions that qualify as business combinations completed after January 1, 2009, we record an obligation for such contingent payments at fair value on the acquisition date. We estimate the fair value of contingent consideration obligations through valuation models that incorporate probability-adjusted assumptions related to the achievement of the milestones and thus likelihood of making related payments. We revalue these contingent consideration obligations each reporting period. Changes in the fair value of our contingent consideration obligations are recognized withinin our consolidated statements of income. Changes in the fair value of the contingent consideration obligations can result from changes to one or multiple inputs, including adjustments to the discount rates, changes in the amount or timing of expected expenditures associated with product development, changes in the amount or timing of cash flows and reserves associated with products upon commercialization, changes in the assumed achievement or timing of any cumulative sales-based and development milestones, changes in the probability of certain clinical events and changes in the assumed probability associated with regulatory approval.

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Discount rates in our valuation models represent a measure of the credit risk associated with settling the liability. The period over which we discount our contingent obligations is based on the current development stage of the product candidates, our specific development plan for that product candidate adjusted for the probability of completing the development step, and when the contingent payments would be triggered. In estimating the probability of success, we utilize data regarding similar milestone events from several sources, including industry studies and our own experience. These fair value measurements are based on significant inputs not observable in the market. Significant judgment is employed in determining the appropriateness of these assumptions as of the acquisition date and for each subsequent period. Accordingly, changes in assumptions could have a material impact on the amount of contingent consideration expense we record in any given period.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


Derivative Instruments and Hedging Activities
We recognize all derivative instruments as either assets or liabilities at fair value in our consolidated balance sheets. Changes in the fair value of derivatives are recorded each period in current earnings or accumulated other comprehensive income (loss), depending on whether a derivative is designated as part of a hedge transaction and, if so, the type of hedge transaction. We classify the cash flows from these instruments in the same category as the cash flows from the hedged items. We do not hold or issue derivative instruments for trading or speculative purposes.
We assess, both at inception and on an ongoing basis, whether the derivatives that are used in hedging transactions are highly effective in offsetting the changes in cash flows or fair values of the hedged items. We also assess hedge ineffectiveness on a quarterly basis and record the gain or loss related to the ineffective portion to current earnings. If we determine that a forecasted transaction is no longer probable of occurring, we discontinue hedge accounting for the affected portion of the hedge instrument, and any related unrealized gain or loss on the contract is recognized in current earnings.
Translation of Foreign Currencies
The functional currency for most of our foreign subsidiaries is their local currency. For our non-U.S. subsidiaries that transact in a functional currency other than the U.S. dollar, assets and liabilities are translated at current rates of exchange at the balance sheet date. Income and expense items are translated at the average foreign exchange rates for the period. Adjustments resulting from the translation of the financial statements of our foreign operations into U.S. dollars are excluded from the determination of net income and are recorded in accumulated other comprehensive income, a separate component of equity. For subsidiaries where the functional currency differsof the assets and liabilities differ from the local currency, non-monetary assets and liabilities are translated at the rate of exchange in effect on the date assets were acquired while monetary assets and liabilities are translated at current rates of exchange as of the balance sheet date. Income and expense items are translated at the average foreign currency rates for the period. Translation adjustments of these subsidiaries are included in other income (expense), net, in our consolidated statements of income.
Royalty Cost of Sales
We make royalty payments to a number of third parties under license or purchase agreements associated with our acquisition of intellectual property. These royalty payments are typically calculated as a percentage (royalty rate) of the sales of our products withinin a particular year. That royalty rate may remain constant, increase or decrease within each year based on the total amount of sales during the annual period. Each quarterly period, we estimate our total royalty obligation for the full year and recognize the proportional amount as cost of sales based on actual quarterly sales as a percentage of full year estimated sales. For example, if the level of net sales in any calendar year increases the royalty rate within the year, we will record our cost of sales at an even rate over the year, based on the estimated blended royalty rate.
Accounting for Share-Based Compensation
Our share-based compensation programs grant awards that have included stock options, restricted stock units which vest based on stock performance known as market stock units (MSUs), performance-vested restricted stock units which settle in cash (CSPUs), time-vested restricted stock units (RSUs), performance-vested restricted stock units which can be settled in cash or shares of our common stock (PUs) at the sole discretion of the Compensation and Management Development Committee of the Board of Directors and shares issued under our employee stock purchase plan (ESPP). We charge the estimated fair value of awards against income over the requisite service period, which is generally the vesting period. Where awards are made with non-substantive vesting periods (for instance,

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

where a portion of the award vests upon retirement eligibility), we estimate and recognize expense based on the period from the grant date to the date on which the employee is retirement eligible.
The fair values of our stock option grants are estimated as of the date of grant using a Black-Scholes option valuation model. The estimated fair values of the stock options are then expensed over the options’ vesting periods.
The fair values of our MSUs are estimated using a lattice model with a Monte Carlo simulation. We apply an accelerated attribution method to recognize stock basedshare-based compensation expense over the applicable service period, net of estimated forfeitures, when accounting for our MSUs. The probability of actual shares expected to be earned is considered in the grant date valuation, therefore the expense willis not be adjusted to reflect the actual units earned.
The fair values of our RSUs are based on the market value of our stock on the date of grant. Compensation expense for RSUs is recognized straight-line over the applicable service period.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


We apply an accelerated attribution method to recognize stock basedshare-based compensation expense when accounting for our CSPUs and PUs and the fair value of the liability is remeasured at the end of each reporting period through expected settlement. Compensation expense associated with CSPUs and PUs are based upon the stock price and the number of units expected to be earned after assessing the probability that certain performance criteria will be met and the associated targeted payout level that is forecasted will be achieved, net of estimated forfeitures. Cumulative adjustments are recorded each quarter to reflect changes in the stock price and estimated outcome of the performance-related conditions until the date results are determined and settled.
The purchase price of common stock under our ESPP is equal to 85% of the lowerlesser of (i) the fair market value per share of the common stock on the first business day of an offering period orand (ii) the fair market value per share of the common stock on the purchase date. The fair value of the discounted purchases made under our ESPP is calculated using the Black-Scholes model. The fair value of the look-back provision plus the 15% discount is recognized as compensation expense over the 90 day purchase period.
Research and Development Expenses
Research and development expenses consist of upfront fees and milestones paid to collaborators and expenses incurred in performing research and development activities, which include compensation and benefits, facilities expenses,and overhead expenses, clinical trial and related clinical manufacturing expenses write-offs of pre-approved inventory that was previously capitalized that are determined to be no longer realizable,and fees paid to contract research organizations (CROs), clinical supply and manufacturing expenses, write-offs of inventory that was previously capitalized in anticipation of product launch and determined to no longer be realizable, and other outside expenses. Research and development expenses are expensed as incurred. Payments we make for research and development services prior to the services being rendered are recorded as prepaid assets on our consolidated balance sheets and are expensed as the services are provided. We also accrue the costs of ongoing clinical trials associated with programs that have been terminated or discontinued for which there is no future economic benefit at the time the decision is made to terminate or discontinue the program.
From time to time, we enter into development agreements in which we share expenses with a collaborative partner. We record payments received from our collaborative partners for their share of the development costs as a reduction of research and development expense, except as discussed withinin Note 20,19, Collaborative and Other Relationships to these consolidated financial statements. Because an initial indication has been approved for both RITUXAN and GAZYVA, expenses incurred by Genentech in the ongoing development of RITUXAN and GAZYVA are not recorded as research and development expense, but rather reduce our share of profits recorded as a component of unconsolidated joint business revenues.revenues from anti-CD20 therapeutic programs.
For collaborations with commercialized products, if we are the principal, we record revenue and the corresponding operating costs in their respective line items withinin our consolidated statements of income. If we are not the principal, we record operating costs as a reduction of revenue.
Selling, General and Administrative Expenses
Selling, general and administrative expenses are primarily comprised of compensation and benefits associated with sales and marketing, finance, human resources, legal, information technology and other administrative personnel, outside marketing, advertising and legal expenses and other general and administrative costs.
Advertising costs are expensed as incurred. For the years ended December 31, 2014, 20132016, 2015 and 2012,2014, advertising costs totaled $92.9$106.3 million,, $72.7 $108.6 million and $54.3$92.9 million,, respectively.

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Income Taxes
The provision for income taxes includes federal, state, local and foreign taxes. Income taxes are accounted for under the liability method. Deferred tax assets and liabilities are recognized for the estimated future tax consequences of temporary differences between the financial statement carrying amounts and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the year in which the temporary differences are expected to be recovered or settled. We evaluate the realizability of our deferred tax assets and establish a valuation allowance when it is more likely than not that all or a portion of deferred tax assets will not be realized.
All tax effects associated with intercompany transfers of assets withinin our consolidated group, both current and deferred, are recorded as a prepaid tax or deferred charge and recognized through the consolidated statement of income when the asset transferred is sold to a third party or otherwise recovered through amortization of the asset's remaining economic life. If the asset transferred becomes impaired, for example through the discontinuation of a research program, we will expense any remaining deferred charge or prepaid tax.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


We account for uncertain tax positions using a “more-likely-than-not” threshold for recognizing and resolving uncertain tax positions. We evaluate uncertain tax positions on a quarterly basis and consider various factors including, but not limited to, changes in tax law, the measurement of tax positions taken or expected to be taken in tax returns, the effective settlement of matters subject to audit, information obtained during in process audit activities and changes in facts or circumstances related to a tax position. We also accrue for potential interest and penalties related to unrecognized tax benefits in income tax expense.
Contingencies
We are currently involved in various claims and legal proceedings. Loss contingency provisions are recorded if the potential loss from any claim, asserted or unasserted, or legal proceeding is considered probable and the amount can be reasonably estimated or a range of loss can be determined. These accruals represent management’s best estimate of probable loss. Disclosure also is provided when it is reasonably possible that a loss will be incurred or when it is reasonably possible that the amount of a loss will exceed the recorded provision. On a quarterly basis, we review the status of each significant matter and assess its potential financial exposure. Significant judgment is required in both the determination of probability and the determination as to whether an exposure is reasonably estimable. Because of uncertainties related to these matters, accruals are based only on the best information available at the time. As additional information becomes available, we reassess the potential liability related to pending claims and litigation and may change our estimates. These changes in the estimates of the potential liabilities could have a material impact on our consolidated results of operations and financial position.
Earnings per Share
Basic earnings per share is computed using the two-class method. Under the two-class method,by dividing undistributed net income is allocatedattributable to Biogen Inc. by the weighted-average number of common stock and participating securities based on their respective rights to share in dividends. We have determined that our Preferred Stock meets the definition of participating securities. We did not have any shares of Preferred Stock issued and outstanding during 2014, 2013 or 2012.the period.
New Accounting Pronouncements
From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board (FASB) or other standard setting bodies that we adopt as of the specified effective date. Unless otherwise discussed, we do not believe that the impact of recently issued standards that are not yet effective will not have a material impact on our financial position or results of operations upon adoption.
In May 2014 the FASB issued ASUAccounting Standards Update (ASU) No. 2014-09, Revenue from Contracts with Customers (Topic 606), which supersedes all existing revenue recognition requirements, including most industry-specific guidance. The new standard requires a company to recognize revenue when it transfers goods or services to customers in an amount that reflects the consideration that the company expects to receive for those goods or services. The FASB has subsequently issued the following amendments to ASU 2014-09 which have the same effective date and transition date of January 1, 2018:
In August 2015 the FASB issued ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date, which delayed the effective date of the new standard will be effective for us onfrom January 1, 2017. 2017 to January 1, 2018. The FASB also agreed to allow entities to choose to adopt the standard as of the original effective date.

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

In March 2016 the FASB issued ASU No. 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations, which clarifies the implementation guidance on principal versus agent considerations.
In April 2016 the FASB issued ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing, which clarifies certain aspects of identifying performance obligations and licensing implementation guidance.
In May 2016 the FASB issued ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients related to disclosures of remaining performance obligations, as well as other amendments to guidance on collectability, non-cash consideration and the presentation of sales and other similar taxes collected from customers.
In December 2016 the FASB issued ASU No. 2016-20, Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers, which amends certain narrow aspects of the guidance issued in ASU 2014-09 including guidance related to the disclosure of remaining performance obligations and prior-period performance obligations, as well as other amendments to the guidance on loan guarantee fees, contract costs, refund liabilities, advertising costs and the clarification of certain examples.
We are currently evaluating the method of adoption and the potential impact that Topic 606 may have on our financial position and results of operations.
In June 2014,April 2015 the FASB issued ASU No. 2014-11, Transfers2015-05, Intangibles - Goodwill and ServicingOther - Internal-Use Software (Subtopic 350-40): Customer's Accounting for Fees Paid in a Cloud Computing Arrangement. Under this standard, if a cloud computing arrangement includes a software license, the software license element of the arrangement should be accounted for consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the arrangement should be accounted for as a service contract. We adopted this standard as of January 1, 2016, which did not have an impact on our financial position or results of operations.
In July 2015 the FASB issued ASU No. 2015-11, Inventory (Topic 860)330): Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosure.Simplifying the Measurement of Inventory. The new standard expands secured borrowing accountingapplies only to inventory for repurchase-to-maturity transactionswhich cost is determined by methods other than last-in, first-out and repurchase financingsthe retail inventory method, which includes inventory that is measured using first-in, first-out or average cost. Inventory within the scope of this standard is required to be measured at the lower of cost and net realizable value. Net realizable value is the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal and transportation. We adopted this standard as of January 1, 2016, which did not have an impact on our financial position or results of operations.
In September 2015 the FASB issued ASU No. 2015-16, Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments. The new standard requires that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined and sets forth new disclosure requirements for repurchase agreements, securities lending transactions,related to the adjustments. We adopted this standard as of January 1, 2016, which did not have an impact on our financial position or results of operations.
In January 2016 the FASB issued ASU No. 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and repurchase-to-maturity transactionsMeasurement of Financial Assets and Financial Liabilities. This new standard amends certain aspects of accounting and disclosure requirements of financial instruments, including the requirement that areequity investments with readily determinable fair values be measured at fair value with changes in fair value recognized in our results of operations. This new standard does not apply to investments accounted for as secured borrowings. Theunder the equity method of accounting or those that result in consolidation of the investee. Equity investments that do not have readily determinable fair values may be measured at fair value or at cost minus impairment adjusted for changes in observable prices. A financial liability that is measured at fair value in accordance with the fair value option is required to be presented separately in other comprehensive income for the portion of the total change in the fair value resulting from change in the instrument-specific credit risk. In addition, a valuation allowance should be evaluated on deferred tax assets related to available-for-sale debt securities in combination with other deferred tax assets. This new standard will be effective for us on AprilJanuary 1, 2015.2018. The adoption of this standard is not expected to have a material impact on our financial position or results of operations.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

In February 2016 the FASB issued ASU No. 2016-02, Leases (Topic 842). This new standard requires that all lessees recognize the assets and liabilities that arise from leases on the balance sheet and disclose qualitative and quantitative information about its leasing arrangements. This new standard will be effective for us on January 1, 2019. The adoption of this standard is not expected to have a material impact on our net financial position, but will impact the amount of our assets and liabilities. We are currently evaluating the potential impact that this standard may have on our results of operations.
In March 2016 the FASB issued ASU No. 2016-06, Derivatives and Hedging (Topic 815): Contingent Put and Call Options in Debt Instruments. This new standard simplifies the embedded derivative analysis for debt instruments containing contingent call or put options by removing the requirement to assess whether a contingent event is related to interest rates or credit risks. This new standard will be effective for us on January 1, 2017. The adoption of this standard is not expected to have an impact on our financial position or results of operations.
2.    Acquisitions
TYSABRI
On April 2, 2013, we acquired full ownershipIn March 2016 the FASB issued ASU No. 2016-07, Investments - Equity Method and Joint Ventures (Topic 323): Simplifying the Transition to the Equity Method of all remaining rights to TYSABRI from ElanAccounting. This new standard eliminates the requirement that we did not already own or control. Upon the closingwhen an investment qualifies for use of the transaction, weequity method as a result of an increase in the level of ownership interest or degree of influence, an adjustment must be made an upfrontto the investment, results of operations and retained earnings retroactively on a step-by-step basis as if the equity method had been in effect during all previous periods that the investment has been held. This new standard will be effective for us on January 1, 2017. The adoption of this standard is not expected to have a material impact on our financial position or results of operations.
In March 2016 the FASB issued ASU No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. This new standard requires recognition of the income tax effects of vested or settled awards in the income statement and involves several other aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of $3.25 billionawards as either equity or liabilities and classification on the statement of cash flows. This new standard will be effective for us on January 1, 2017. The adoption of this standard is not expected to Elan, which was funded fromhave a material impact on our existingfinancial position, results of operations or statements of cash flows upon adoption.
In June 2016 the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. This new standard changes the impairment model for most financial assets and our collaboration agreement with Elan was terminated.
Wecertain other instruments. Under the new standard, entities holding financial assets and net investment in leases that are not accounted for at fair value through net income to be presented at the net amount expected to be collected. An allowance for credit losses will be a valuation account that will be deducted from the amortized cost basis of the financial asset to present the net carrying value at the amount expected to be collected on the financial asset. This new standard will be effective for us on January 1, 2020. The adoption of this transaction asstandard is not expected to have a material impact on our financial position or results of operations.
In August 2016 the acquisitionFASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments. This new standard clarifies certain aspects of the statement of cash flows, including the classification of debt prepayment or debt extinguishment costs or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowing, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate-owned life insurance policies, distributions received from equity method investees and beneficial interests in securitization transactions. This new standard also clarifies that an entity should determine each separately identifiable source of use within the cash receipts and payments on the basis of the nature of the underlying cash flows. In situations in which cash receipts and payments have aspects of more than one class of cash flows and cannot be separated by source or use, the appropriate classification should depend on the activity that is likely to be the predominant source or use of cash flows for the item. This new standard will be effective for us on January 1, 2018. The adoption of this standard is not expected to have a material impact on our statements of cash flows upon adoption.
In October 2016 the FASB issued ASU No. 2016-16, Income Taxes (Topic 740): Intra-Entity Transfer of Assets Other Than Inventory. This new standard eliminates the exception for an intra-entity transfer of an asset as we did not acquire any employees from Elan nor did we acquire any significant processes that we did not previously perform or manage under the collaboration agreement.other than inventory. Under the collaboration agreement, we manufactured TYSABRInew standard, entities should recognize the income tax consequences on an intra-entity transfer of an asset other than inventory when the transfer occurs. This new standard will be effective for us on January 1, 2018 and collaborated with Elanwill be applied on the product's marketing, commercial, regulatory, distribution and ongoing development activities. The collaboration agreement was designeda modified retrospective basis through a cumulative-effect adjustment directly to effect an equal sharing of worldwide profits and losses generated by the activitiesretained earnings as of the collaboration. For additional information related tobeginning of the period of adoption. We are currently evaluating the potential impact this collaboration, please read Note 20, Collaborativestandard may have on our financial position and Other Relationships to these consolidated financial statements.results of operations.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


In January 2017 the FASB issued ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. This new standard clarifies the definition of a business and provides a screen to determine when an integrated set of assets and activities is not a business. The $3.25 billion upfront payment was capitalized inscreen requires that when substantially all of the second quarter of 2013 as an intangible asset within our consolidated balance sheet as TYSABRI had reached technological feasibility. We adjusted thefair value of the gross assets acquired (or disposed of) is concentrated in a single identifiable asset or a group of similar identifiable assets, the set is not a business. This new standard will be effective for us on January 1, 2018. However, we have adopted this intangible asset by $84.4 million relatedstandard as of January 1, 2017, with prospective application to deferred revenue from two sales-based milestones previously paid by Elan as well as transaction costs. The net intangible asset capitalized was $3,178.3 million. Commencing in the second quarter of 2013, we began amortizing this intangible asset over the estimated useful life using an economic consumption method based on actual and expected revenue generated from the sales of our TYSABRI product, which was 17 years.any business development transaction.
Following the April 2, 2013 closing of the transaction, we began recording 100% of U.S. revenues, cost of sales and operating expenses related to TYSABRI within our consolidated statements of income. Under the terms of the acquisition agreement, we continued to share TYSABRI profits with Elan on an equal basis until April 30, 2013. We recorded the profit split for the month ended April 30, 2013, as cost of sales within our consolidated statements of income as we controlled TYSABRI effective April 2, 2013. Between May 1, 2013 and April 30, 2014, we made contingent payments to Elan of 12% on worldwide net sales of TYSABRI. Commencing May 1, 2014 and thereafter, we will make contingent payments to Elan of 18% on annual worldwide net sales up to $2.0 billion and 25% on annual worldwide net sales that exceed $2.0 billion. In 2014, the $2.0 billion threshold was pro-rated for the portion of 2014 remaining after the first
2.        Acquisitions
Convergence Pharmaceuticals
On February 12, months expired. Royalty payments to Elan and other third parties are recognized as cost of sales within our consolidated statements of income.
Stromedix, Inc.
In March 2012,2015, we completed our acquisition of all of the outstanding stock of Stromedix, Inc. (Stromedix). Convergence Pharmaceuticals (Convergence), a clinical-stage biopharmaceutical company with a focus on developing product candidates for neuropathic pain. Convergence’s lead candidate was a Phase 2 clinical candidate BIIB074 (CNV1014802), which had demonstrated clinical activity in proof-of-concept studies for TGN. Additionally, BIIB074 had potential applicability in several other neuropathic pain states, including lumbosacral radiculopathy and erythromelalgia.
The purchase price includedconsisted of a $75.0$200.1 million cash payment and up to a maximum of $487.5 million inat closing, plus contingent consideration in the form of development and approval milestones up to a maximum of $450.0 million, of which $275.0$350.0 million related directly to was associated with the development and approval of STX-100BIIB074 for the treatment of idiopathic pulmonary fibrosis (IPF).TGN. The acquisition was funded from our existing cash on hand and was accounted for as the acquisition of a business. In addition to acquiring the outstanding stock of the entity and obtaining the rights to STX-100,BIIB074 and additional product candidates in preclinical development, we obtainedretained the services of key employees and the rights to a second antibody and an antibody conjugate, which are both in preclinical development.of Convergence.
UponIn connection with our acquisition of Convergence, we recorded a contingent consideration obligationliability of $122.2$274.5 million representing the fair value of the contingent consideration. This amount was estimated through a valuation model that incorporated industry-based probability-adjustedprobability adjusted assumptions relating to the achievement of these milestones and thus the likelihood of us making the contingent payments. This fair value measurement was based upon significant inputs not observable in the market and therefore represented a Level 3 measurement.
The purchase price, as adjusted, consisted of the following:
(In millions) 
Cash portion of consideration$200.1
Contingent consideration274.5
Total purchase price$474.6
During the second quarter of 2015 we adjusted our preliminary estimate of the fair value of the assets acquired and contingent consideration as of the date of acquisition as a result of finalizing the purchase price accounting. This resulted in an increase in the value of our estimated contingent consideration and goodwill by $36.0 million, respectively. Our revised purchase price allocation is reflected in the chart below. Our purchase price allocation is complete.
Subsequent changes in the fair value of thisthe contingent consideration obligation arewill be recognized as adjustments to contingent consideration and reflected withinin our consolidated statements of income. We allocated $219.2In the fourth quarter of 2016 a $50.0 million and $48.2 million of the total purchase price to acquired IPR&D and goodwill, respectively. During 2013, we adjusted the goodwill by $4.1 million to establish a deferred tax assetmilestone related to our transaction.BIIB074 in an additional neuropathic pain indication was earned and paid, resulting in a reduction to the contingent consideration. For additional information related to ourthe fair value of this obligation, please read Note 8,7, Fair Value Measurements to these consolidated financial statements.
Prior to the acquisition of Stromedix, we had an equity interest equal to approximately 5.0% of the company’s total capital stock (on an “as converted” basis) pursuant to a license agreement we entered into with Stromedix in 2007 for the development of the STX-100 product candidate. Based on the fair market value of this equity interest derived from the purchase price, we recognized a gain of approximately $9.0 million in 2012, which was recorded as a component of other income (expense), net within our consolidated statement of income.
3.Gain on Sale of Rights
During the third quarter of 2012, we sold all of our rights, including rights to royalties, related to BENLYSTA (belimumab) to a DRI Capital managed fund (DRI). Under the terms of the BENLYSTA sale agreement, we received payments from DRI equal to a multiple of royalties payable by the Human Genome Sciences, Inc. and GlaxoSmithKline plc for the period covering October 2011 to September 2014 and a one-time contingency payment that could be paid to us if the cumulative royalties over the full royalty term exceed an agreed amount.
The payments received during 2014, 2013 and 2012 totaled $16.8 million, $24.9 million and $46.8 million, respectively. These payments were recorded as a gain on sale of rights within our consolidated statements of income.
The period under which we would receive royalties expired in September 2014. Therefore, we will not receive any additional payments under this agreement.

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BIOGEN IDEC INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

The following table summarizes the estimated fair values of the separately identifiable assets acquired and liabilities assumed as of February 12, 2015, as adjusted:

4.    Accounts Receivable
(In millions) 
In-process research and development$424.6
Other intangible assets7.6
Goodwill128.3
Deferred tax liability(84.9)
Other, net(1.0)
Total purchase price$474.6
Our accounts receivableestimate of the fair value of the IPR&D programs acquired was determined through a probability adjusted discounted cash flow analysis utilizing a discount rate of 11%. This valuation was primarily arisedriven by the value associated with the lead candidate, BIIB074, which is in development for the treatment of TGN and was expected to be completed no earlier than 2020, at a remaining cost of approximately $145.0 million. The fair value associated with BIIB074 for the treatment of TGN was $200.0 million. We recorded additional IPR&D assets related to the use of BIIB074 in two additional neuropathic pain indications, with a total estimated value of $220.0 million. The remaining cost of development for these two indications was approximately $415.0 million, with an expected completion date of no earlier than 2021. These fair value measurements were based on significant inputs not observable in the market and thus represented Level 3 fair value measurements.
We attributed the goodwill recognized to the Convergence workforce's expertise in chronic pain research and clinical development and to establishing a deferred tax liability for the acquired IPR&D intangible assets which had no tax basis. The goodwill was not tax deductible.
Pro forma results of operations would not be materially different as a result of the acquisition of Convergence and therefore are not presented. Subsequent to the acquisition date, our results of operations include the results of operations of Convergence.
3.        Restructuring, Business Transformation and Other Cost Saving Initiatives
2015 Cost Saving Initiatives
2015 Restructuring Charges
On October 21, 2015, we announced a corporate restructuring, which included the termination of certain pipeline programs and an 11% reduction in workforce. Under this restructuring, cash payments were estimated to total approximately $120.0 million, of which $15.9 million were related to previously accrued 2015 incentive compensation, resulting in net restructuring charges totaling approximately $102.0 million. These amounts were substantially paid by the end of 2016.
For the year ended December 31, 2016, we recognized total net restructuring charges of $8.0 million. We previously recognized $93.4 million of restructuring charges in our consolidated statements of income during the fourth quarter of 2015. Our restructuring reserve is included in accrued expenses and other in our consolidated balance sheets.
The following table summarizes the charges and spending related to our 2015 restructuring program during 2016:
(In millions)
Workforce
Reduction
 
Pipeline
Programs
 Total
Restructuring reserve as of December 31, 2015$33.7
 $3.6
 $37.3
Expense4.9
 5.4
 10.3
Payments(31.2) (9.0) (40.2)
Adjustments to previous estimates, net(5.2) 2.9
 (2.3)
Restructuring reserve as of December 31, 2016$2.2
 $2.9
 $5.1

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

2016 Organizational Changes and Cost Saving Initiatives
2016 Restructuring Charges
During the third quarter of 2016 we initiated cost saving measures primarily intended to realign our organizational structure due to the changes in roles and workforce resulting from productour decision to spin off our hemophilia business, and to achieve further targeted cost reductions. For the year ended December 31, 2016, we recognized charges totaling $17.7 million related to this effort, which are in addition to, and separate from, the 2015 corporate restructuring described above. These amounts, which were substantially incurred and paid by the end of 2016, are primarily related to severance and are reflected in restructuring charges in our consolidated statements of income.
Cambridge, MA Manufacturing Facility
In June 2016 following an evaluation of our current and future manufacturing capabilities and capacity needs, we determined that we intend to vacate and cease manufacturing in our 67,000 square foot small-scale biologics manufacturing facility in Cambridge, MA and also vacate our 46,000 square foot warehouse space in Somerville, MA.
In December 2016 we subleased our rights to the manufacturing facility in Cambridge, MA to Brammer Bio MA, LLC (Brammer). Brammer also purchased from us certain manufacturing equipment, leasehold improvements and other assets in exchange for shares of Brammer common LLC interests and assumed manufacturing operations effective January 1, 2017. In December 2016 we also closed and vacated our warehouse space in Somerville, MA.
Our departure from these facilities shortened the expected useful lives of certain leasehold improvements and other assets at these facilities. As a result, we recorded additional depreciation expense to reflect the assets' new shorter useful lives. For the year ended December 31, 2016, we recognized approximately $45.5 million of this additional depreciation, which was recorded as cost of sales in our consolidated statements of income.
Under the terms of the agreement, Brammer will also provide manufacturing and other transition and support services to us.
In the fourth quarter of 2016 we recognized charges totaling $7.4 million for severance costs related to certain employees separated from Biogen in connection with this transaction. These amounts will be substantially incurred and paid by the end of first quarter of 2017 and are reflected in restructuring charges in our consolidated statements of income.
4.    Reserves for Discounts and Allowances
An analysis of the change in reserves for discounts and allowances is summarized as follows:
(In millions)Discounts 
Contractual
Adjustments
 Returns Total
2016       
Beginning balance$56.1
 $548.7
 $57.9
 $662.7
Current provisions relating to sales in current year592.6
 2,044.5
 30.9
 2,668.0
Adjustments relating to prior years(1.4) 1.5
 (16.8) (16.7)
Payments/returns relating to sales in current year(522.5) (1,576.0) (1.0) (2,099.5)
Payments/returns relating to sales in prior years(53.2) (536.0) (19.8) (609.0)
Ending balance$71.6
 $482.7
 $51.2
 $605.5

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(In millions)Discounts 
Contractual
Adjustments
 Returns Total
2015       
Beginning balance$47.6
 $387.1
 $49.1
 $483.8
Current provisions relating to sales in current year459.7
 1,732.1
 37.6
 2,229.4
Adjustments relating to prior years(1.3) (16.3) (14.7) (32.3)
Payments/returns relating to sales in current year(405.9) (1,258.1) (2.6) (1,666.6)
Payments/returns relating to sales in prior years(44.0) (296.1) (11.5) (351.6)
Ending balance$56.1
 $548.7
 $57.9
 $662.7
(In millions)Discounts 
Contractual
Adjustments
 Returns Total
2014       
Beginning balance$47.0
 $345.5
 $33.7
 $426.2
Current provisions relating to sales in current year347.3
 1,265.4
 39.1
 1,651.8
Adjustments relating to prior years(1.0) (28.5) 13.5
 (16.0)
Payments/returns relating to sales in current year(299.7) (933.4) (4.1) (1,237.2)
Payments/returns relating to sales in prior years(46.0) (261.9) (33.1) (341.0)
Ending balance$47.6
 $387.1
 $49.1
 $483.8
The total revenue-related reserves above, included in our consolidated balance sheets, are summarized as follows:
 As of December 31,
(In millions)2016 2015
Reduction of accounts receivable$166.9
 $144.6
Component of accrued expenses and other438.6
 518.1
Total revenue-related reserves$605.5
 $662.7
5.        Inventory
The components of inventory are summarized as follows:
 As of December 31,
(In millions)2016 2015
Raw materials$170.4
 $213.0
Work in process698.7
 577.6
Finished goods170.3
 143.0
Total inventory$1,039.4
 $933.6
    
Balance Sheet Classification:   
Inventory$1,001.6
 $893.4
Investments and other assets37.8
 40.2
Total inventory$1,039.4
 $933.6
Long-term inventory, which primarily consists of work in process, is included in investments and other assets in our consolidated balance sheets.

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

As of December 31, 2015, our inventory included $24.7 million associated with our ZINBRYTA program, $24.2 million associated with our FLIXABI program and $18.4 million associated with our BENEPALI program, which had been capitalized in advance of regulatory approval. The European Commission (EC) approved the marketing authorization applications for BENEPALI and FLIXABI, two anti-tumor necrosis factor (TNF) biosimilars, for marketing in the E.U. in January 2016 and May 2016, respectively. In addition, ZINBRYTA was approved for the treatment of relapsing forms of MS in the U.S. in May 2016 and Europe and mainly representin the E.U. in July 2016. For information on our pre-approval inventory policy, please read Note 1, Summary of Significant Accounting Policies to these consolidated financial statements
Inventory amounts due from our wholesale distributors, public hospitals andwritten down as a result of excess, obsolescence, unmarketability or other government entities. Amounts determined to be uncollectiblereasons are charged to cost of sales, and totaled $48.2 million, $41.9 million and $50.6 million for the years ended December 31, 2016, 2015 and 2014, respectively.
6.        Intangible Assets and Goodwill
Intangible Assets
Intangible assets, net of accumulated amortization, impairment charges and adjustments, are summarized as follows:
   As of December 31, 2016 As of December 31, 2015
(In millions)Estimated Life Cost 
Accumulated
Amortization
 Net Cost 
Accumulated
Amortization
 Net
Out-licensed patents13-23 years $543.3
 $(523.6) $19.7
 $543.3
 $(506.0) $37.3
Developed technology15-23 years 3,005.3
 (2,634.3) 371.0
 3,005.3
 (2,552.9) 452.4
In-process research and developmentIndefinite until commercialization 648.0
 
 648.0
 730.5
 
 730.5
Trademarks and trade namesIndefinite 64.0
 
 64.0
 64.0
 
 64.0
Acquired and in-licensed rights and patents6-18 years 3,481.7
 (776.1) 2,705.6
 3,303.2
 (502.3) 2,800.9
Total intangible assets  $7,742.3
 $(3,934.0) $3,808.3
 $7,646.3
 $(3,561.2) $4,085.1
Amortization of acquired intangible assets totaled $385.6 million, $382.6 million and $489.8 million for the years ended December 31, 2016, 2015 and 2014, respectively. Amortization of acquired intangible assets during 2016 included impairment charges of $12.2 million related to two of our IPR&D intangible assets. Amortization of acquired intangible assets during 2014 included impairment charges of $34.7 million related to one of our out-licensed patents and $16.2 million related to one of our IPR&D intangible assets.
Out-licensed Patents
Out-licensed patents to third-parties primarily relate to patents acquired in connection with the merger of Biogen, Inc. and IDEC Pharmaceuticals Corporation in 2003. During 2014 we recorded a charge of $34.7 million related to the impairment of one of our out-licensed patents to reflect a change in its estimated fair value due to a change in the underlying competitive market for that product. The charge was included in amortization of acquired intangible assets in our consolidated statements of income. The fair value of the intangible asset was based on a discounted cash flow calculated using Level 3 fair value measurements and inputs including estimated revenues. There were no impairment charges related to our out-licensed patents during 2016 or written-off against2015.
Developed Technology
Developed technology primarily relates to our AVONEX product, which was recorded in connection with the reserve. To date, our historical reservesmerger of Biogen, Inc. and write-offsIDEC Pharmaceuticals Corporation in 2003. The net book value of accounts receivablethis asset as of December 31, 2016, was $363.3 million.

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

IPR&D
IPR&D represents the fair value assigned to research and development assets that we acquire and have not been significant.reached technological feasibility at the date of acquisition. Upon commercialization, we will determine the estimated useful life. In connection with our acquisition of Convergence in February 2015, we acquired IPR&D programs with an estimated fair value of $424.6 million. This amount has and will be adjusted for foreign exchange rate fluctuations. For a more detailed description of this transaction, please read Note 2, Acquisitions to these consolidated financial statements.
An analysis of anticipated lifetime revenues and anticipated development costs is performed annually during our long- range planning cycle, which was updated in the third quarter of 2016. This analysis is based upon certain assumptions that we evaluate on a periodic basis, including anticipated future product sales, the expected impact of changes in the amount of development costs and the probabilities of our programs succeeding, the introduction of new products by our competitors and changes in our commercial and pipeline product candidates.  
During the fourth quarter of 2016 we terminated our collaboration agreements with Rodin Therapeutics, Inc. and Ataxion Inc., resulting in impairment losses of $8.7 million and $3.5 million, respectively, reflecting the full value of the assets recorded upon entering into the collaboration agreements. These impairment losses are included in amortization of acquired intangible assets in our consolidated statements of income.
During the third quarter of 2014 we updated the probabilities of success related to the early stage programs acquired through our recent acquisitions. The change in probability of success, combined with a delay in one of the projects, resulted in an impairment loss of $16.2 million in one of our IPR&D assets during 2014. This impairment is included in amortization of acquired intangible assets in our consolidated statements of income.
Acquired and In-licensed Rights and Patents
Acquired and in-licensed rights and patents primarily relate to our acquisition of all remaining rights to TYSABRI from Elan Corporation plc (Elan). The net book value of this asset as of December 31, 2016, was $2,493.2 million.
The creditnet change in acquired and economic conditions within Italy, Spainin-licensed rights and Portugal, among other memberspatents during the year ended December 31, 2016, reflects:
$60.0 million milestone payment due to Ionis Pharmaceuticals, Inc. (Ionis) for the approval of SPINRAZA in the U.S. in December 2016;
$50.0 million in total milestone payments due to Samsung Bioepis, which became payable upon the approval of BENEPALI and FLIXABI in the E.U. continuein January 2016 and May 2016, respectively;
$32.0 million in total milestone payments due to remain uncertain. Uncertain creditAbbVie, Inc. (AbbVie), which became payable upon the approval of ZINBRYTA in the U.S. in May 2016 and economic conditions have generally ledthe E.U. in July 2016; and
$26.5 million upon the approval of ALPROLIX in the E.U. in May 2016 which is comprised of a $20.0 million contingent payment due to the former owners of Syntonix Pharmaceuticals, Inc. (Syntonix) and $6.5 million related to the establishment of a lengtheningcorresponding deferred tax liability.
For additional information on our relationships with Samsung Bioepis, AbbVie and Ionis, please read Note 19, Collaborative and Other Relationships to these consolidated financial statements.
Estimated Future Amortization of time to collect our accounts receivable in some of these countries. In Portugal and select regions in Spain, where our collections have slowed and a significant portion of these receivables are routinely being collected beyond our contractual payment terms and over periods in excess of one year, we have discounted our receivables and reduced related revenuesIntangible Assets
Our amortization expense is based on the periodeconomic consumption of timeintangible assets. Our most significant intangible assets are related to our AVONEX and TYSABRI products. Annually, during our long-range planning cycle, we perform an analysis of anticipated lifetime revenues of AVONEX and TYSABRI. This analysis is also updated whenever events or changes in circumstances would significantly affect the anticipated lifetime revenues of either product.

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Our most recent long range planning cycle was completed in the third quarter of 2016. Based upon this analysis, the estimated future amortization of acquired intangible assets is expected to be as follows:
(In millions)As of December 31, 2016
2017$334.8
2018312.7
2019295.2
2020259.7
2021242.8
Goodwill
The following table provides a roll forward of the changes in our goodwill balance:
 As of December 31,
(In millions)2016 2015
Goodwill, beginning of year$2,663.8
 $1,760.2
Increase to goodwill1,026.9
 908.1
Other(21.4) (4.5)
Goodwill, end of year$3,669.3
 $2,663.8
The increase in goodwill during 2016 was related to $1.2 billion in contingent milestones achieved (exclusive of $173.1 million in tax benefits) and payable to the former shareholders of Fumapharm AG or holders of their rights. Other includes changes related to foreign exchange rate fluctuations. The increase in goodwill during 2015 was related to $900.0 million in contingent milestones achieved (exclusive of $120.2 million in tax benefits) and payable to the former shareholders of Fumapharm AG or holders of their rights and $128.3 million related to our acquisition of Convergence.
For additional information related to future contingent payments to the former shareholders of Fumapharm AG or holders of their rights, please read Note 21, Commitments and Contingencies to these consolidated financial statements. For additional information related to our acquisition of Convergence, please read Note 2, Acquisitions to these consolidated financial statements.
As of December 31, 2016, we had no accumulated impairment losses related to goodwill.

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

7.        Fair Value Measurements
The tables below present information about our assets and liabilities that are regularly measured and carried at fair value and indicate the level within the fair value hierarchy of the valuation techniques we utilized to determine such fair value:
(In millions)As of
December 31,
2016
 
Quoted
Prices in
Active
Markets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Assets:       
Cash equivalents$2,039.6
 $
 $2,039.6
 $
Marketable debt securities:       
Corporate debt securities2,663.8
 
 2,663.8
 
Government securities2,172.5
 
 2,172.5
 
Mortgage and other asset backed securities561.7
 
 561.7
 
Marketable equity securities24.9
 24.9
 
 
Derivative contracts61.0
 
 61.0
 
Plan assets for deferred compensation34.5
 
 34.5
 
Total$7,558.0
 $24.9
 $7,533.1
 $
Liabilities:       
Derivative contracts$13.6
 $
 $13.6
 $
Contingent consideration obligations467.6
 
 
 467.6
Total$481.2
 $
 $13.6
 $467.6
(In millions)As of
December 31,
2015
 
Quoted
Prices
in Active
Markets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Assets:       
Cash equivalents$909.5
 $
 $909.5
 $
Marketable debt securities:       
Corporate debt securities1,510.9
 
 1,510.9
 
Government securities2,875.9
 
 2,875.9
 
Mortgage and other asset backed securities494.1
 
 494.1
 
Marketable equity securities37.5
 37.5
 
 
Derivative contracts27.2
 
 27.2
 
Plan assets for deferred compensation40.1
 
 40.1
 
Total$5,895.2
 $37.5
 $5,857.7
 $
Liabilities:       
Derivative contracts$14.7
 $
 $14.7
 $
Contingent consideration obligations506.0
 
 
 506.0
Total$520.7
 $
 $14.7
 $506.0
The fair value of Level 2 instruments classified as cash equivalents and marketable debt securities were determined through third-party pricing services. For a description of our validation procedures related to prices provided by third-party pricing services, refer to Note 1, Summary of Significant Accounting Policies: Fair Value Measurements, to these consolidated financial statements.

F- 30

BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Debt Instruments
The fair values of our debt instruments, which are Level 2 liabilities, are summarized as follows:
 As of December 31,
(In millions)2016 2015
Notes payable to Fumedica$6.1
 $9.4
6.875% Senior Notes due March 1, 2018583.7
 602.6
2.900% Senior Notes due September 15, 20201,521.5
 1,497.5
3.625% Senior Notes due September 15, 20221,026.6
 1,014.2
4.050% Senior Notes due September 15, 20251,796.0
 1,764.6
5.200% Senior Notes due September 15, 20451,874.5
 1,757.6
Total$6,808.4
 $6,645.9
The fair value of our notes payable to Fumedica was estimated using market observable inputs, including current interest and foreign currency exchange rates. The fair values of each of our series of Senior Notes were determined through market, observable, and corroborated sources. For additional information related to our debt instruments, please read Note 11, Indebtedness to these consolidated financial statements.
Contingent Consideration Obligations
The following table provides a roll forward of the fair values of our contingent consideration obligations which includes Level 3 measurements:
 As of December 31,
(In millions)2016 2015
Fair value, beginning of year$506.0
 $215.5
Additions
 274.5
Changes in fair value14.8
 30.5
Payments and other(53.2) (14.5)
Fair value, end of year$467.6
 $506.0
As of December 31, 2016 and 2015, approximately $246.8 million and $301.3 million, respectively, of the fair value of our total contingent consideration obligations was reflected as a component of other long-term liabilities in our consolidated balance sheets with the remaining balance reflected as a component of accrued expenses and other. Payments and other for 2016 includes $7.9 million of a Convergence milestone converted to a short-term obligation under the terms of the acquisition agreement.
There were no changes in valuation techniques or transfers between fair value measurement levels during the years ended December 31, 2016 and 2015. The fair values of the intangible assets and contingent consideration liabilities were based on a probability-adjusted discounted cash flow calculation using Level 3 fair value measurements and inputs including estimated revenues and probabilities of success. For additional information related to the valuation techniques and inputs utilized in valuation of our financial assets and liabilities, please read Note 1, Summary of Significant Accounting Policies to these consolidated financial statements.
Convergence
In connection with our acquisition of Convergence in February 2015 we recorded a contingent consideration obligation of $274.5 million. This valuation was based on probability weighted net cash outflow projections of $450.0 million, discounted using a rate of 2.0%, which was the estimated cost of debt financing for market participants. This liability reflected the revised estimate those amountsfrom the date of acquisition for our initial clinical development plans, resulting probabilities of success and the timing of certain milestone payments. For a more detailed description of this transaction, please read Note 2, Acquisitions to these consolidated financial statements.
As of December 31, 2016 and 2015, the fair value of this contingent consideration obligation was $258.9 million and $297.5 million, respectively. Our most recent valuation was determined based upon probability weighted net cash flow projections of $400.0 million, discounted using a rate of 2.7%, which is a measure of the credit risk associated with settling the liability.

F- 31

BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

For 2016 compared to 2015, the net decrease in the fair value of this obligation was primarily due to achievement of a $50.0 million milestone related to a second indication, partially offset by changes in the discount rate and an increase in the probability of success related to the achievement of certain developmental milestones. Approximately $148.4 million is reflected as a component of accrued expenses and other in our consolidated balance sheets as we expect to make the payment within one year.
Stromedix Inc.
In connection with our acquisition of Stromedix Inc. (Stromedix) in March 2012 we recorded a contingent consideration obligation of $122.2 million. As of December 31, 2016 and 2015, the fair value of this contingent consideration obligation was $133.2 million and $131.5 million, respectively. Our most recent valuation was determined based upon probability weighted net cash outflow projections of $419.0 million, discounted using a rate of 2.2%, which is a measure of the credit risk associated with settling the liability.
For 2016 compared to 2015, the net increase in the fair value of this obligation was primarily due to changes in the discount rate, partially offset by changes in the expected timing related to the achievement of certain remaining developmental milestones. Approximately $56.9 million is reflected as a component of accrued expenses and other in our consolidated balance sheets as we expect to make the payment within one year.
Biogen Idec International Neuroscience GmbH
In connection with our acquisition of Biogen Idec International Neuroscience GmbH (BIN), formerly Panima Pharmaceuticals AG (Panima), in December 2010 we recorded a contingent consideration obligation of $81.2 million. As of December 31, 2016 and 2015, the fair value of this contingent consideration obligation was $75.5 million and $77.0 million, respectively. Our most recent valuation was determined based upon probability weighted net cash outflow projections of $361.7 million, discounted using a rate of 2.7%, which is a measure of the credit risk associated with settling the liability.
For 2016 compared to 2015, the net decrease in the fair value of this obligation was primarily due to payment of $3.3 million in developmental milestones, partially offset by changes in the discount rate. Approximately $15.5 million is reflected as a component of accrued expenses and other in our consolidated balance sheets as we expect to make the payment within one year.
Acquired IPR&D
In connection with our acquisition of Convergence, we also allocated $424.6 million of the total purchase price to acquired IPR&D, which was capitalized as an intangible asset. The amount allocated to acquired IPR&D was based on significant inputs not observable in the market and thus represented a Level 3 fair value measurement. This estimate was also adjusted from our preliminary estimate as of the date of acquisition to reflect revised estimates to our initial clinical development plans, resulting probabilities of success and the timing of certain milestone payments. These assets will be paid,tested for impairment annually until commercialization, after which time the IPR&D will be amortized over its estimated useful life. For a more detailed description of this transaction, please read Note 2, Acquisitions to these consolidated financial statements.
8.    Financial Instruments
The following table summarizes our financial assets with maturities of less than 90 days from the date of purchase included in cash and cash equivalents on the accompanying consolidated balance sheet:
 As of December 31,
(In millions)2016 2015
Commercial paper$31.0
 $21.9
Overnight reverse repurchase agreements
 134.7
Money market funds741.7
 673.8
Short-term debt securities1,266.9
 79.1
Total$2,039.6
 $909.5

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

The carrying values of our commercial paper, including accrued interest, overnight reverse repurchase agreements, money market funds and our short-term debt securities approximate fair value due to their short term maturities. Our overnight reverse repurchase agreements were collateralized with agency-guaranteed mortgage-backed securities and represented approximately 0.7% of total assets as of December 31, 2015.
The following tables summarize our marketable debt and equity securities, classified as available for sale:
As of December 31, 2016 (In millions)
Fair
Value
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Amortized
Cost
Corporate debt securities       
Current$1,408.6
 $0.2
 $(0.6) $1,409.0
Non-current1,255.2
 1.2
 (4.7) 1,258.7
Government securities       
Current1,156.0
 0.2
 (0.3) 1,156.1
Non-current1,016.5
 0.5
 (3.4) 1,019.4
Mortgage and other asset backed securities       
Current4.0
 
 
 4.0
Non-current557.7
 0.8
 (2.2) 559.1
Total marketable debt securities$5,398.0
 $2.9
 $(11.2) $5,406.3
Marketable equity securities, non-current$24.9
 $0.7
 $(9.3) $33.5
As of December 31, 2015 (In millions)
Fair
Value
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Amortized
Cost
Corporate debt securities       
Current$394.3
 $
 $(0.5) $394.8
Non-current1,116.6
 0.1
 (4.1) 1,120.6
Government securities       
Current1,723.4
 0.1
 (1.1) 1,724.4
Non-current1,152.5
 
 (3.1) 1,155.6
Mortgage and other asset backed securities       
Current2.8
 
 
 2.8
Non-current491.3
 0.1
 (1.8) 493.0
Total marketable debt securities$4,880.9
 $0.3
 $(10.6) $4,891.2
Marketable equity securities, non-current$37.5
 $9.2
 $
 $28.3
Summary of Contractual Maturities: Available-for-Sale Securities
The estimated fair value and amortized cost of our marketable debt securities available-for-sale by contractual maturity are summarized as follows:
 As of December 31, 2016 As of December 31, 2015
(In millions)
Estimated
Fair  Value
 
Amortized
Cost
 
Estimated
Fair  Value
 
Amortized
Cost
Due in one year or less$2,568.6
 $2,569.1
 $2,120.5
 $2,122.0
Due after one year through five years2,552.6
 2,559.7
 2,575.9
 2,583.9
Due after five years276.8
 277.5
 184.5
 185.3
Total available-for-sale securities$5,398.0
 $5,406.3
 $4,880.9
 $4,891.2
The average maturity of our marketable debt securities available-for-sale as of December 31, 2016 and 2015 was 12 months and 16 months, respectively.

F- 33

BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Proceeds from Marketable Debt Securities
The proceeds from maturities and sales of marketable debt securities and resulting realized gains and losses are summarized as follows:
 For the Years Ended December 31,
(In millions)2016 2015 2014
Proceeds from maturities and sales$7,378.9
 $4,063.0
 $2,718.9
Realized gains$3.3
 $1.5
 $0.7
Realized losses$4.3
 $3.5
 $0.5
Realized losses for the year ended December 31, 2016, primarily relate to sales of corporate bonds, agency mortgage-backed securities and other asset-backed securities. Realized losses for the year ended December 31, 2015, primarily relate to sales of corporate bonds, agency mortgage-backed securities and other asset-backed securities. Realized losses for the year ended December 31, 2014, primarily relate to sales of agency mortgage-backed securities and government securities.
Strategic Investments
As of December 31, 2016 and 2015, our strategic investment portfolio was comprised of investments totaling $99.9 million and $96.0 million, respectively, which are included in investments and other assets in our consolidated balance sheets. Our strategic investment portfolio includes investments in equity securities of certain biotechnology companies and investments in venture capital funds where the underlying investments are in equity securities of biotechnology companies.
9.    Derivative Instruments
Foreign Currency Forward Contracts - Hedging Instruments
Due to the global nature of our operations, portions of our revenues and operating expenses are recorded in currencies other than the U.S. dollar. The value of revenues and operating expenses measured in U.S. dollars is therefore subject to changes in foreign currency exchange rates. In order to mitigate these changes we use foreign currency forward contracts to lock in exchange rates associated with a portion of our forecasted international revenues and operating expenses.
Foreign currency forward contracts in effect as of December 31, 2016 and 2015, had durations of 1 to 18 months, respectively. These contracts have been designated as cash flow hedges and accordingly, to the extent such period exceeds one year, using the country’s market-based borrowing rate for such period. The related receivables are classified at the time of sale as non-current assets. We accrete interest incomeeffective, any unrealized gains or losses on these receivables,foreign currency forward contracts are reported in accumulated other comprehensive income (loss) (referred to as AOCI in the tables below). Realized gains and losses for the effective portion of such contracts are recognized in revenue when the sale of product in the currency being hedged is recognized and, beginning in the fourth quarter of 2015, in operating expenses when the expense in the currency being hedged is recorded. To the extent ineffective, hedge transaction gains and losses are reported in other income (expense), net.
The notional value of foreign currency forward contracts that were entered into to hedge forecasted revenues and operating expenses is summarized as follows:
 
Notional Amount
As of December 31,
Foreign Currency: (In millions)2016 2015
Euro$871.7
 $945.5
Swiss francs
 80.8
Canadian dollar
 76.7
Total foreign currency forward contracts$871.7
 $1,103.0

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

The portion of the fair value of these foreign currency forward contracts that was included in accumulated other comprehensive income (loss) in total equity reflected net gains of $49.8 million, $1.8 million and $72.1 million for the years ended December 31, 2016, 2015 and 2014, respectively. We expect all contracts to be settled over the next 18 months and any amounts in accumulated other comprehensive income (loss) to be reported as an adjustment to revenue or operating expense. We consider the impact of our and our counterparties’ credit risk on the fair value of the contracts as well as the ability of each party to execute its contractual obligations. As of December 31, 2016 and 2015, credit risk did not change the fair value of our foreign currency forward contracts.
The following table summarizes the effect of foreign currency forward contracts designated as hedging instruments on our consolidated statements of income:
For the Years Ended December 31,
Net Gains/(Losses)
Reclassified from AOCI into Net Income
(Effective Portion)
 
Net Gains/(Losses)
Recognized into Net Income
(Ineffective Portion)
Location 2016 2015 2014 Location 2016 2015 2014
Revenue $5.3
 $173.2
 $6.8
 Other income (expense) $2.9
 $4.9
 $(1.5)
Operating expenses $(1.5) $
 $
 Other income (expense) $0.1
 $
 $
Interest Rate Contracts - Hedging Instruments
We have entered into interest rate lock contracts or interest rate swap contracts on certain borrowing transactions to manage our exposure to interest rate changes and to reduce our overall cost of borrowing.
Interest Rate Lock Contracts
During 2015 we entered into treasury rate locks, with an aggregated notional amount of $1.1 billion, which were designated as cash flow hedges to hedge against changes in the 10-year and 30-year U.S. treasury interest rates that could have impacted our anticipated debt offering. In connection with the issuance of our 4.05% and 5.20% Senior Notes, as described in Note 11, Indebtedness, we settled the treasury rate locks and realized an $8.5 million gain. As the hedging relationship was effective, the gain was recorded in AOCI and will be recognized in other income (expense), net over the life of the 4.05% and 5.20% Senior Notes.
Interest Rate Swap Contracts
In connection with the issuance of our 2.90% Senior Notes, as described in Note 11, Indebtedness, we entered into interest rate swaps with an aggregate notional amount of $675.0 million, which expire on September 15, 2020. The interest rate swap contracts are designated as hedges of the fair value changes in the 2.90% Senior Notes attributable to changes in interest rates. Since the specific terms and notional amount of the swaps match the debt being hedged, it is assumed to be a highly effective hedge and all changes in the fair value of the swaps are recorded as a component of the 2.90% Senior Notes with no net impact recorded in income. Any net interest payments made or received on the interest rate swap contracts are recognized as a component of interest expense in our consolidated statements of income.
Foreign Currency Forward Contracts - Other Derivatives
We also enter into other foreign currency forward contracts, usually with durations of one month or less, to mitigate the foreign currency risk related to certain balance sheet positions. We have not elected hedge accounting for these transactions.
The aggregate notional amount of these outstanding foreign currency contracts was $902.1 million and $721.0 million as of December 31, 2016 and 2015, respectively. Net losses of $29.2 million, $23.8 million and $15.5 million related to these contracts were recognized as a component of other income (expense), net, withinfor the years ended December 31, 2016, 2015 and 2014, respectively.
Summary of Derivatives
While certain of our derivatives are subject to netting arrangements with our counterparties, we do not offset derivative assets and liabilities in our consolidated statementsbalance sheets.

F- 35

OurBIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

The following table summarizes the fair value and presentation in our consolidated balance sheets of our outstanding derivatives including those designated as hedging instruments:
(In millions)Balance Sheet LocationFair Value
As of December 31, 2016
Hedging Instruments:  
Asset derivativesOther current assets$50.4
 Investments and other assets$6.6
Liability derivativesOther long-term liabilities$4.6
Other Derivatives:  
Asset derivativesOther current assets$4.0
Liability derivativesAccrued expenses and other$9.0
(In millions)Balance Sheet LocationFair Value
As of December 31, 2015
Hedging Instruments:  
Asset derivativesOther current assets$16.6
 Investments and other assets$0.3
Liability derivativesAccrued expenses and other$10.2
 Other long-term liabilities$2.5
Other Derivatives:  
Asset derivativesOther current assets$10.3
Liability derivativesAccrued expenses and other$2.0
10.      Property, Plant and Equipment
Property, plant and equipment are recorded at historical cost, net accounts receivable balances from product sales in selected European countriesof accumulated depreciation. Components of property, plant and equipment, net are summarized as follows:
 As of December 31, 2014
(In millions)
Current
Balance Included
within Accounts
Receivable, net
 
Non-Current
Balance  Included
within Investments
and Other Assets
 Total
Spain$62.5
 $5.0
 $67.5
Italy$51.4
 $0.5
 $51.9
Portugal$15.1
 $7.6
 $22.7
 As of December 31,
(In millions)2016 2015
Land$137.8
 $74.7
Buildings1,107.8
 1,035.6
Leasehold improvements123.7
 166.6
Machinery and equipment1,105.8
 1,079.6
Computer software and hardware746.8
 647.1
Furniture and fixtures60.6
 72.9
Construction in progress658.6
 441.2
Total cost3,941.1
 3,517.7
Less: accumulated depreciation(1,439.3) (1,330.1)
Total property, plant and equipment, net$2,501.8
 $2,187.6
Depreciation expense totaled $309.3 million, $217.9 million and $198.4 million for 2016, 2015 and 2014, respectively.
 As of December 31, 2013
(In millions)
Current
Balance Included
within Accounts
Receivable, net
 
Non-Current
Balance  Included
within Investments
and Other Assets
 Total
Spain$113.3
 $6.8
 $120.1
Italy$76.1
 $2.4
 $78.5
Portugal$10.4
 $8.2
 $18.6
For 2016, 2015 and 2014, we capitalized interest costs related to construction in progress totaling approximately $12.9 million, $10.4 million and $6.4 million, respectively.
Approximately $14.2 million and $45.9 million of the total net accounts receivable balances for these countries were overdue more than one year as of December 31, 2014 and 2013, respectively. Solothurn, Switzerland Facility
During the first quarter of 2016 we closed on the purchase of land in Solothurn, Switzerland for 64.4 million Swiss Francs (approximately $62.5 million). We are building a biologics manufacturing facility on this land in the Commune of Luterbach over the next several years. As of December 31, 2016 and 2015, we had approximately $481.5 million and $99.0 million, respectively, capitalized as construction in progress related to the construction of this facility.

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Research Triangle Park Facility Purchase
On August 24, 2015, we purchased from Eisai, Inc. (Eisai) its drug product manufacturing facility and supporting infrastructure in Research Triangle Park (RTP), North Carolina for $104.8 million. The purchase price consisted of $58.6 million for buildings, $25.9 million for machinery and equipment and $20.3 million for land.
On August 24, 2015, we also amended our existing 10-year lease related to Eisai's oral solid dose products manufacturing facility in RTP, North Carolina where we manufacture our and Eisai's oral solid dose products. As amended, the lease provides for a three-year term and our agreement to purchase the facility upon expiration of the lease term and Eisai's completion of certain activities. Accordingly, we recorded the assets along with a corresponding financing obligation on our consolidated balance sheet for $20.3 million, the net present value of the future minimum lease payments. The assets were recorded as a component of buildings and machinery and equipment. We expect to complete the purchase of the oral solid products manufacturing facility at the end of the lease term in the third quarter of 2018.
11.     Indebtedness
Our indebtedness is summarized as follows:
 As of December 31,
(In millions)2016 2015
Current portion:   
Notes payable to Fumedica$3.0
 $3.1
Financing arrangement for the purchase of the RTP facility1.7
 1.7
Current portion of notes payable and other financing arrangements$4.7
 $4.8
Non-current portion:   
6.875% Senior Notes due March 1, 2018$558.5
 $565.3
2.900% Senior Notes due September 15, 20201,485.3
 1,485.5
3.625% Senior Notes due September 15, 2022993.2
 992.2
4.050% Senior Notes due September 15, 20251,734.8
 1,733.4
5.200% Senior Notes due September 15, 20451,721.5
 1,721.1
Notes payable to Fumedica3.0
 5.9
Financing arrangement for the purchase of the RTP facility16.4
 18.1
Non-current portion of notes payable and other financing arrangements$6,512.7
 $6,521.5
The following is a summary of our principal indebtedness as of December 31, 2016:
$550.0 million aggregate principal amount of 6.875% Senior Notes due March 1, 2018, valued at 99.184% of par;
$1.5 billion aggregate principal amount of 2.90% Senior Notes due September 15, 2020, valued at 99.792% of par;
$1.0 billion aggregate principal amount of 3.625% Senior Notes due September 15, 2022, valued at 99.920% of par;
$1.75 billion aggregate principal amount of 4.05% Senior Notes due September 15, 2025, valued at 99.764% of par; and
$1.75 billion aggregate principal amount of 5.20% Senior Notes due September 15, 2045, valued at 99.294% of par.
The costs associated with these offerings of approximately $52.0 million have been recorded as a reduction to the carrying amount of the debt on our consolidated balance sheet. These costs along with the discounts will be amortized as additional interest expense using the effective interest rate method over the period from issuance through maturity.
These notes are senior unsecured obligations. The notes may be redeemed at our option at any time at 100% of the principal amount plus accrued interest and a specified make-whole amount. The 6.875% Senior Notes due in

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

2018 contain a change of control provision that may require us to purchase the notes under certain circumstances. There is also an interest rate adjustment feature that requires us to pay interest at an increased rate on the notes if the credit rating on the notes declines below investment grade. The remaining Senior Notes contain a change of control provision that may require us to purchase the notes at a price equal to 101% of the principal amount plus accrued and unpaid interest to the date of purchase under certain circumstances.
In connection with the 2.90% Senior Notes offering due in 2020, we entered into interest rate swap contracts. The carrying value of the 2.90% Senior Notes includes approximately $4.6 million related to changes in the fair value of these contracts. For additional information, please read Note 9, Derivative Instruments, to these consolidated financial statements.
In connection with the 6.875% Senior Notes due in 2018, we entered into interest rate swap contracts where we received a fixed rate and paid a variable rate. These contracts were terminated in December 2008. Upon termination of these swaps, the carrying amount of the 6.875% Senior Notes due in 2018 was increased by $62.8 million and is being amortized using the effective interest rate method over the remaining life of the Senior Notes and is being recognized as a reduction of interest expense. As of December 31, 2016, $9.9 million remains to be amortized.
Notes Payable to Fumedica
In connection with our 2006 distribution agreement with Fumedica, we issued notes totaling 61.4 million Swiss Francs which were payable to Fumedica in varying amounts from June 2008 through June 2018. Our remaining note payable to Fumedica had a carrying value of 6.2 million Swiss Francs ($6.0 million) and 8.9 million Swiss Francs ($9.0 million) as of December 31, 2016 and 2015, respectively.
Credit Facility
In August 2015 we entered into a $1.0 billion, five-year senior unsecured revolving credit facility under which we are permitted to draw funds for working capital and general corporate purposes. The terms of the revolving credit facility include a financial covenant that requires us not to exceed a maximum consolidated leverage ratio. As of December 31, 2016, we had no outstanding borrowings and were in compliance with all covenants under this facility.
Financing Arrangement
During 2015 we recorded a financing obligation in relation to the amendment of our lease agreement of Eisai's oral solid dose products manufacturing facility in RTP, North Carolina where we manufacture our and Eisai's oral solid dose products. As of December 31, 2016 and 2015, the financing obligation totaled approximately $18.1 million and $19.8 million, respectively. For additional information, please read Note 10, Property, Plant and Equipment to these consolidated financial statements.
Debt Maturity
The total gross payments, excluding our financing arrangement, due under our debt arrangements are as follows:
(In millions)As of December 31, 2016
2017$3.1
2018553.1
2019
20201,500.0
2021
2022 and thereafter4,500.0
Total$6,556.2
The fair value of our debt is disclosed in Note 7, Fair Value Measurements to these consolidated financial statements.

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

12.      Equity
Preferred Stock
We have 8.0 million shares of Preferred Stock authorized, of which 1.75 million shares are authorized as Series A, 1.0 million shares are authorized as Series X junior participating and 5.25 million shares are undesignated. Shares may be issued without a vote or action of stockholders from time to time in classes or series with the designations, powers, preferences, and the relative, participating, optional or other special rights of the shares of each such class or series and any qualifications, limitations or restrictions thereon as set forth in the instruments governing such shares. Any such Preferred Stock may rank prior to common stock as to dividend rights, liquidation preference or both, and may have full or limited voting rights and may be convertible into shares of common stock. No shares of Preferred Stock were issued and outstanding during 2016, 2015 and 2014.
Common Stock
The following table describes the number of shares authorized, issued and outstanding of our common stock as of December 31, 2016 and 2015:
 As of December 31, 2016 As of December 31, 2015
(In millions)Authorized Issued Outstanding Authorized Issued Outstanding
Common stock1,000.0
 238.5
 215.9
 1,000.0
 241.2
 218.6
Share Repurchases
In July 2016 our Board of Directors authorized a program to repurchase up to $5.0 billion of our common stock (2016 Share Repurchase Program). This authorization does not have an expiration date. Repurchased shares will be retired. As of December 31, 2016, we repurchased and retired 3.3 million shares of common stock at a cost of $1.0 billion under our 2016 Share Repurchase Program.
In May 2015 our Board of Directors authorized a program to repurchase up to $5.0 billion of our common stock (2015 Share Repurchase Program), which was completed as of December 31, 2015. As of December 31, 2015, we repurchased and retired approximately 16.8 million shares of common stock at a cost of $5.0 billion under our 2015 Share Repurchase Program.
In February 2011 our Board of Directors authorized a program to repurchase up to 20.0 million shares of our common stock (2011 Share Repurchase Program), which has been used principally to offset common stock issuances under our share-based compensation plans. The 2011 Share Repurchase Program does not have an expiration date. We did not repurchase any shares of common stock under our 2011 Share Repurchase Program during the years ended December 31, 2016 and 2015. During 2014 we receivedpurchased approximately $59.62.9 million shares of common stock at a cost of $886.8 million under our 2011 Share Repurchase Program. We have approximately 1.3 million shares remaining available for repurchase under this authorization.
13.      Accumulated Other Comprehensive Income (Loss)
The following table summarizes the changes in accumulated other comprehensive income (loss), net of tax by component:
(In millions)Unrealized Gains (Losses) on Securities Available for Sale Unrealized Gains (Losses) on Cash Flow Hedges Unfunded Status of Postretirement Benefit Plans Translation Adjustments Total
Balance, December 31, 2015$(0.8) $10.2
 $(37.8) $(195.6) $(224.0)
Other comprehensive income (loss) before reclassifications(10.6) 51.6
 5.1
 (138.6) (92.5)
Amounts reclassified from accumulated other comprehensive income (loss)0.6
 (4.0) 
 
 (3.4)
Net current period other comprehensive income (loss)(10.0) 47.6
 5.1
 (138.6) (95.9)
Balance, December 31, 2016$(10.8) $57.8
 $(32.7) $(334.2) $(319.9)

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(In millions)Unrealized Gains (Losses) on Securities Available for Sale Unrealized Gains (Losses) on Cash Flow Hedges Unfunded Status of Postretirement Benefit Plans Translation Adjustments Total
Balance, December 31, 2014$(0.4) $71.7
 $(31.6) $(99.2) $(59.5)
Other comprehensive income (loss) before reclassifications(1.7) 110.8
 (6.2) (96.4) 6.5
Amounts reclassified from accumulated other comprehensive income (loss)1.3
 (172.3) 
 
 (171.0)
Net current period other comprehensive income (loss)(0.4) (61.5) (6.2) (96.4) (164.5)
Balance, December 31, 2015$(0.8) $10.2
 $(37.8) $(195.6) $(224.0)
(In millions)Unrealized Gains (Losses) on Securities Available for Sale Unrealized Gains (Losses) on Cash Flow Hedges Unfunded Status of Postretirement Benefit Plans Translation Adjustments Total
Balance, December 31, 2013$5.6
 $(23.7) $(19.6) $10.0
 $(27.7)
Other comprehensive income (loss) before reclassifications0.4
 101.7
 (12.0) (109.2) (19.1)
Amounts reclassified from accumulated other comprehensive income (loss)(6.4) (6.3) 
 
 (12.7)
Net current period other comprehensive income (loss)(6.0) 95.4
 (12.0) (109.2) (31.8)
Balance, December 31, 2014$(0.4) $71.7
 $(31.6) $(99.2) $(59.5)
The following table summarizes the amounts reclassified from accumulated other comprehensive income:
(In millions)Income Statement Location
Amounts Reclassified from
Accumulated Other Comprehensive Income
For the Years Ended December 31,
2016 2015 2014
Gains (losses) on securities available for saleOther income (expense)$(0.9) $(2.0) $9.9
 Income tax benefit (expense)0.3
 0.7
 (3.5)
       
Gains (losses) on cash flow hedgesRevenues5.3
 173.2
 6.8
 Operating expenses(1.5) 
 
 Other income (expense)0.2
 (0.1) 
 Income tax benefit (expense)
 (0.8) (0.5)
       
Total reclassifications, net of tax $3.4
 $171.0
 $12.7

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

14.      Earnings per Share
Basic and diluted earnings per share are calculated as follows:
 For the Years Ended December 31,
(In millions)2016 2015 2014
Numerator:     
Net income attributable to Biogen Inc.$3,702.8
 $3,547.0
 $2,934.8
Denominator:     
Weighted average number of common shares outstanding218.4
 230.7
 236.4
Effect of dilutive securities:     
Stock options and employee stock purchase plan0.1
 0.1
 0.1
Time-vested restricted stock units0.2
 0.3
 0.5
Market stock units0.1
 0.1
 0.2
Dilutive potential common shares0.4
 0.5
 0.8
Shares used in calculating diluted earnings per share218.8
 231.2
 237.2
Amounts excluded from the calculation of net income per diluted share because their effects were anti-dilutive were insignificant.
Earnings per share for the years ended December 31, 2016, 2015 and 2014, reflects, on a weighted average basis, the repurchase of 0.7 million shares, 4.6 million shares and 1.0 million shares, respectively, of our common stock under our share repurchase authorizations.
15.     Share-based Payments
Share-based Compensation Expense
The following table summarizes share-based compensation expense included in our consolidated statements of income:
 For the Years Ended December 31,
(In millions)2016 2015 2014
Research and development$84.5
 $88.6
 $102.1
Selling, general and administrative121.7
 127.3
 150.3
Restructuring charges(1.8) (8.6) 
Subtotal204.4
 207.3
 252.4
Capitalized share-based compensation costs(14.6) (11.0) (10.0)
Share-based compensation expense included in total cost and expenses189.8
 196.3
 242.4
Income tax effect(54.0) (55.8) (72.2)
Share-based compensation expense included in net income attributable to Biogen Inc.$135.8
 $140.5
 $170.2

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

The following table summarizes share-based compensation expense associated with each of our share-based compensation programs:
 For the Years Ended December 31,
(In millions)2016 2015 2014
Market stock units$38.4
 $38.1
 $37.4
Time-vested restricted stock units120.0
 119.0
 115.4
Cash settled performance units16.3
 22.4
 65.5
Performance units18.6
 13.9
 21.9
Employee stock purchase plan11.1
 13.9
 12.2
Subtotal204.4
 207.3
 252.4
Capitalized share-based compensation costs(14.6) (11.0) (10.0)
Share-based compensation expense included in total cost and expenses$189.8
 $196.3
 $242.4
Windfall tax benefits from vesting of stock awards, exercises of stock options and ESPP participation were $12.6 million, $78.2 million and $96.4 million in payments from Spain2016, 2015 and 2014, respectively. These amounts have been calculated under the alternative transition method.
As of December 31, 2016, unrecognized compensation cost related to receivables aged greaterunvested share-based compensation was approximately $189.8 million, net of estimated forfeitures. We expect to recognize the cost of these unvested awards over a weighted-average period of 1.9 years.
Share-Based Compensation Plans
We have three share-based compensation plans pursuant to which awards are currently being made: (i) the Biogen Inc. 2006 Non-Employee Directors Equity Plan (2006 Directors Plan); (ii) the Biogen Inc. 2008 Amended and Restated Omnibus Equity Plan (2008 Omnibus Plan); and (iii) the Biogen Inc. 2015 Employee Stock Purchase Plan (ESPP).
Directors Plan
In May 2006 our stockholders approved the 2006 Directors Plan for share-based awards to our directors. Awards granted from the 2006 Directors Plan may include stock options, shares of restricted stock, restricted stock units, stock appreciation rights and other awards in such amounts and with such terms and conditions as may be determined by a committee of our Board of Directors, subject to the provisions of the plan. We have reserved a total of 1.6 million shares of common stock for issuance under the 2006 Directors Plan. The 2006 Directors Plan provides that awards other than stock options and stock appreciation rights will be counted against the total number of shares reserved under the plan in a 1.5-to-1 ratio. In June 2015 our stockholders approved an amendment to extend the term of the 2006 Directors Plan until June 2025.
Omnibus Plans
In June 2008 our stockholders approved the 2008 Omnibus Plan for share-based awards to our employees. Awards granted from the 2008 Omnibus Plan may include stock options, shares of restricted stock, restricted stock units, performance shares, shares of phantom stock, stock appreciation rights and other awards in such amounts and with such terms and conditions as may be determined by a committee of our Board of Directors, subject to the provisions of the plan. Shares of common stock available for issuance under the 2008 Omnibus Plan consist of 15.0 million shares reserved for this purpose, plus shares of common stock that remained available for issuance under our 2005 Omnibus Equity Plan on the date that our stockholders approved the 2008 Omnibus Plan, plus shares that were subject to awards under the 2005 Omnibus Equity Plan that remain unissued upon the cancellation, surrender, exchange or termination of such awards. The 2008 Omnibus Equity Plan provides that awards other than stock options and stock appreciation rights will be counted against the total number of shares available under the plan in a 1.5-to-1 ratio.
We have not made any awards pursuant to the 2005 Omnibus Equity Plan since our stockholders approved the 2008 Omnibus Plan, and do not intend to make any awards pursuant to the 2005 Omnibus Equity Plan in the future, except that unused shares under the 2005 Omnibus Equity Plan have been carried over for use under the 2008 Omnibus Plan.

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Stock Options
We currently do not grant stock options to our employees or directors. Outstanding stock options previously granted to our employees and directors generally have a ten-year term and vest over a period of between one year.and four years, provided the individual continues to serve at Biogen through the vesting dates. Options granted under all plans are exercisable at a price per share not less than the fair market value of the underlying common stock on the date of grant. The estimated fair value of options, including the effect of estimated forfeitures, is recognized over the options’ vesting periods. The fair value of the stock options granted in 2010 was estimated as of the date of grant using a Black-Scholes option valuation model. There were no grants of stock options made in 2016, 2015 and 2014. As of December 31, 2016, all outstanding options were exercisable.
The expected life of options granted is derived using assumed exercise rates based on historical exercise patterns and represents the period of time that options granted are expected to be outstanding. Expected stock price volatility is based upon implied volatility for our exchange-traded options and other factors, including historical volatility. After assessing all available information on either historical volatility, implied volatility, or both, we have concluded that a combination of both historical and implied volatility provides the best estimate of expected volatility. The risk-free interest rate used is determined by the market yield curve based upon risk-free interest rates established by the Federal Reserve, or non-coupon bonds that have maturities equal to the expected term. The dividend yield of zero is based upon the fact that we have not historically granted cash dividends, and do not expect to issue dividends in the foreseeable future. Stock options granted prior to January 1, 2006 were valued based on the grant date fair value of those awards, using the Black-Scholes option pricing model, as previously calculated for pro-forma disclosures.
The following table summarizes our stock option activity:
 Shares 
Weighted
Average
Exercise
Price
Outstanding at December 31, 2015107,000
 $53.94
Granted
 $
Exercised(41,000) $53.75
Cancelled
 $
Outstanding at December 31, 201666,000
 $54.06
The total intrinsic values of options exercised in 2016, 2015 and 2014 totaled $10.4 million, $38.0 million and $42.7 million, respectively. The aggregate intrinsic values of options outstanding as of December 31, 2016 totaled $15.0 million. The weighted average remaining contractual term for options outstanding as of December 31, 2016 was 2.0 years.
The following table summarizes the amount of tax benefit realized for stock options and cash received from the exercise of stock options:
 For the Years Ended December 31,
(In millions)2016 2015 2014
Tax benefit realized for stock options$4.0
 $11.9
 $13.0
Cash received from the exercise of stock options$2.2
 $6.3
 $8.5
Market Stock Units (MSUs)
MSUs awarded to employees prior to 2014 vested in four equal annual increments beginning on the first anniversary of the grant date. Participants may ultimately earn between 0% and 150% of the target number of units granted based on actual stock performance.
MSUs awarded to employees in 2014, 2015 and 2016 vest in three equal annual increments beginning on the first anniversary of the grant date, and participants may ultimately earn between 0% and 200% of the target number of units granted based on actual stock performance.

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

The vesting of these awards is subject to the respective employee’s continued employment. The number of MSUs granted represents the target number of units that are eligible to be earned based on the attainment of certain market-based criteria involving our stock price. The number of MSUs earned is calculated at each annual anniversary from the date of grant over the respective vesting periods, resulting in multiple performance periods. Accordingly, additional MSUs may be issued or currently outstanding MSUs may be cancelled upon final determination of the number of awards earned. Compensation expense, including the effect of forfeitures, is recognized over the applicable service period.
The following table summarizes our MSU activity:
 Shares 
Weighted
Average
Grant Date
Fair Value
Unvested at December 31, 2015269,000
 $339.89
Granted (a)168,000
 $328.03
Vested(155,000) $244.68
Forfeited(52,000) $371.62
Unvested at December 31, 2016230,000
 $355.60
(a)
MSUs granted in 2016 include approximately 15,000 and 20,000 MSUs issued in 2016 based upon the attainment of performance criteria set for 2013 and 2012, respectively, in relation to awards granted in those years. The remainder of MSUs granted during 2016 include awards granted in conjunction with our annual awards made in February 2016 and MSUs granted in conjunction with the hiring of employees. These grants reflect the target number of shares eligible to be earned at the time of grant.
We value grants of MSUs using a lattice model with a Monte Carlo simulation. This valuation methodology utilizes several key assumptions, including the 60 calendar day average closing stock price on grant date for MSUs awarded prior to 2014, the 30 calendar day average closing stock price on the date of grant for MSUs awarded in 2014, 2015 and 2016, expected volatility of our stock price, risk-free rates of return and expected dividend yield.
The assumptions used in our valuation are summarized as follows:
 For the Years Ended December 31,
 2016 2015 2014
Expected dividend yield—% —% —%
Range of expected stock price volatility38.2% - 40.7% 31.0% - 33.2% 31.7% - 35.1%
Range of risk-free interest rates0.6% - 0.9% 0.2% - 1.0% 0.1% - 0.7%
30 calendar day average stock price on grant date$260.67 - $304.86 $277.35 - $426.27 $280.88 - $335.65
Weighted-average per share grant date fair value$328.03 $493.43 $395.22
The total fair values of MSUs vested in 2016, 2015 and 2014 totaled $39.3 million, $109.0 million and $117.4 million, respectively.
Cash Settled Performance Units (CSPUs)
CSPUs awarded to employees vest in three equal annual increments beginning on the first anniversary of the grant date. The vesting of these awards is subject to the respective employee’s continued employment with such awards settled in cash. The number of CSPUs granted represents the target number of units that are eligible to be earned based on the attainment of certain performance measures established at the beginning of the performance period, which ends on December 31 of each year. Participants may ultimately earn between 0% and 200% of the target number of units granted based on the degree of actual performance metric achievement. Accordingly, additional CSPUs may be issued or currently outstanding CSPUs may be cancelled upon final determination of the number of units earned. CSPUs awarded prior to 2014 are settled in cash based on the 60 calendar day average closing stock price through each vesting date once the actual vested and earned number of units is known. CSPUs awarded in 2014, 2015 and 2016 will be settled in cash based on the 30 calendar day average closing stock price through each vesting date, once the actual vested and earned number of units is known. Since no shares are issued, these awards do not dilute equity. Compensation expense, including the effect of forfeitures, is recognized over the applicable service period.

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

The following table summarizes our CSPU activity:
Shares
Unvested at December 31, 2015192,000
Granted (a)86,000
Vested(117,000)
Forfeited(39,000)
Unvested at December 31, 2016122,000
(a)CSPUs granted in 2016 include awards granted in conjunction with our annual awards made in February 2016 and CSPUs granted in conjunction with the hiring of employees. These grants reflect the target number of shares eligible to be earned at the time of grant.
The total cash paid in settlement of CSPUs vested in 2016, 2015 and 2014 totaled $31.9 million, $79.8 million and $92.8 million, respectively. 
Performance-vested Restricted Stock Units (PUs)
In 2014 we revised our long term incentive program to include a new type of award granted to certain employees in the form of restricted stock units that may be settled in cash or shares of our common stock at the sole discretion of the Compensation and Management Development Committee of our Board of Directors. These awards are structured and accounted for the same way as the cash settled performance units, and vest in three equal annual increments beginning on the first anniversary of the grant date. The number of PUs granted represents the target number of units that are eligible to be earned based on the attainment of certain performance measures established at the beginning of the performance period, which ends on December 31 of each year. Participants may ultimately earn between 0% and 200% of the target number of units granted based on the degree of actual performance metric achievement. Accordingly, additional PUs may be issued or currently outstanding PUs may be cancelled upon final determination of the number of units earned. PUs settling in cash are based on the 30 calendar day average closing stock price through each vesting date once the actual vested and earned number of units is known. Compensation expense, including the effect of forfeitures, is recognized over the applicable service period.
The following table summarizes our PU activity:
Shares
Unvested at December 31, 2015103,000
Granted (a)55,000
Vested(31,000)
Forfeited(17,000)
Unvested at December 31, 2016110,000
(a)PUs granted in 2016 include awards granted in conjunction with our annual awards made in February 2016 and PUs granted in conjunction with the hiring of employees. These grants reflect the target number of shares eligible to be earned at the time of grant.
During 2015 32,000 PU were converted to share settlements, of which approximately 11,000 shares were vested and issued. All other PUs that vested in 2015 were settled in cash totaling $12.4 million.
All PUs that vested in 2016 were settled in cash totaling $8.1 million.
Time-Vested Restricted Stock Units (RSUs)
RSUs awarded to employees generally vest no sooner than one-third per year over three years on the anniversary of the date of grant, or upon the third anniversary of the date of the grant, provided the employee remains continuously employed with us, except as otherwise provided in the plan. Shares of our common stock will be delivered to the employee upon vesting, subject to payment of applicable withholding taxes. RSUs awarded to directors for service on our Board of Directors vest on the first anniversary of the date of grant, provided in each case that the director continues to serve on our Board of Directors through the vesting date. Shares of our common stock will be delivered to the director upon vesting and are not subject to any withholding taxes. The fair value of all RSUs is based on the market value of our stock on the date of grant. Compensation expense, including the effect of forfeitures, is recognized over the applicable service period.

F- 45

BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

The following table summarizes our RSU activity:
 Shares 
Weighted
Average
Grant Date
Fair Value
Unvested at December 31, 2015810,000
 $323.87
Granted (a)649,000
 $268.52
Vested(406,000) $285.13
Forfeited(165,000) $310.30
Unvested at December 31, 2016888,000
 $303.49
(a)
RSUs granted in 2016 primarily represent RSUs granted in conjunction with our annual awards made in February 2016 and awards made in conjunction with the hiring of new employees. RSUs granted in 2016 also include approximately 11,000 RSUs granted to our Board of Directors.
RSUs granted in 2015 and 2014 had weighted average grant date fair values of $388.88 and $321.72, respectively.
The total fair values of RSUs vested in 2016, 2015 and 2014 totaled $104.6 million, $239.7 million and $281.1 million, respectively. 
Employee Stock Purchase Plan (ESPP)
In June 2015 our stockholders approved the Biogen Inc. 2015 ESPP (2015 ESPP). The 2015 ESPP, which became effective on July 1, 2015, replaced the Biogen Idec Inc. 1995 ESPP (1995 ESPP), which expired on June 30, 2015. The maximum aggregate number of shares of our common stock that may be purchased under the 2015 ESPP is 6.2 million.
The following table summarizes our ESPP activity:
 For the Years Ended December 31,
(In millions, except share amounts)2016 2015 2014
Shares issued under the 2015 ESPP190,000
 78,000
 **
Shares issued under the 1995 ESPP
 98,000
 180,000
Cash received under the 2015 ESPP$41.5
 $19.3
 **
Cash received under the 1995 ESPP$
 $30.0
 $46.4

F- 46

BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

16.      Income Taxes
Income Tax Expense
Income before income tax provision and the income tax expense consist of the following:
 For the Years Ended December 31,
(In millions)2016 2015 2014
Income before income taxes (benefit):     
Domestic$3,655.4
 $3,386.7
 $2,557.4
Foreign1,277.6
 1,380.6
 1,389.2
Total$4,933.0
 $4,767.3
 $3,946.6
Income tax expense (benefit):     
Current:     
Federal$1,304.3
 $1,214.1
 $1,159.5
State55.1
 38.6
 65.2
Foreign52.9
 54.5
 73.4
Total1,412.3
 1,307.2
 1,298.1
Deferred:     
Federal$(125.6) $(129.6) $(280.9)
State(3.8) (1.9) (21.0)
Foreign(45.6) (14.1) (6.3)
Total(175.0) (145.6) (308.2)
Total income tax expense$1,237.3
 $1,161.6
 $989.9
Deferred Tax Assets and Liabilities
Significant components of our deferred tax assets and liabilities are summarized as follows:
 As of December 31,
(In millions)2016 2015
Deferred tax assets:   
Tax credits$201.1
 $189.3
Inventory, other reserves and accruals250.6
 243.9
Intangibles, net459.8
 328.3
Net operating loss65.9
 24.7
Share-based compensation61.5
 63.8
Other49.0
 35.8
Valuation allowance(16.1) (14.1)
Total deferred tax assets$1,071.8
 $871.7
Deferred tax liabilities:   
Purchased intangible assets$(376.6) $(440.1)
Depreciation, amortization and other(113.5) (102.7)
Total deferred tax liabilities$(490.1) $(542.8)
In addition to deferred tax assets and liabilities, we have recorded prepaid tax and deferred charges related to intercompany transactions. As of December 31, 2016 and 2015, the total deferred charges and prepaid taxes were $989.8 million and $697.9 million, respectively.


F- 47

BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Tax Rate
A reconciliation between the U.S. federal statutory tax rate and our effective tax rate is summarized as follows:
 For the Years Ended December 31,
 2016 2015 2014
Statutory rate35.0 % 35.0 % 35.0 %
State taxes0.9
 0.5
 1.2
Taxes on foreign earnings(9.6) (10.0) (9.5)
Credits and net operating loss utilization(1.4) (1.3) (1.1)
Purchased intangible assets1.2
 1.0
 1.2
Manufacturing deduction(1.9) (1.8) (1.8)
Other permanent items0.5
 0.7
 0.5
Other0.4
 0.3
 (0.4)
Effective tax rate25.1 % 24.4 % 25.1 %
Our effective tax rate for 2016 compared to 2015 increased primarily due to a net state tax benefit in 2015 resulting from the remeasurement of one of our uncertain tax positions, described below, and a higher relative percentage of our earnings being attributed to the U.S., a higher tax jurisdiction.
Our effective tax rate for 2015 compared to 2014 benefited from lower taxes on foreign earnings and reflects a $27.0 million benefit from the 2015 remeasurement of one of our uncertain tax positions.
As of December 31, 2016, we had net operating losses and general business credit carry forwards for federal income tax purposes of approximately $22.5 million and $140.0 million, respectively, which begin to expire in 2020. Additionally, for state income tax purposes, we had net operating loss carry forwards of approximately $86.4 million, which begin to expire in 2017. For state income tax purposes, we also had research and investment credit carry forwards of approximately $126.6 million, which begin to expire in 2017. For foreign income tax purposes, we had $489.4 million of net operating loss carryforwards, which begin to expire in 2021.
In assessing the realizability of our deferred tax assets, we have considered whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. In making this determination, under the applicable financial reporting standards, we are allowed to consider the scheduled reversal of deferred tax liabilities, projected future taxable income and tax planning strategies. Our estimates of future taxable income take into consideration, among other items, our estimates of future income tax deductions related to the exercise of stock options. Based upon the level of historical taxable income and income tax liability and projections for future taxable income over the periods in which the deferred tax assets are utilizable, we believe it is more likely than not that we will realize the net benefits of the deferred tax assets of our wholly owned subsidiaries. In the event that actual results differ from our estimates or we adjust our estimates in future periods, we may need to establish a valuation allowance, which could materially impact our financial position and results of operations.
As of December 31, 2016, undistributed foreign earnings of non-U.S. subsidiaries included in consolidated retained earnings and other basis differences aggregated approximately $7.6 billion. We intend to reinvest these earnings indefinitely in operations outside the U.S. The residual U.S. tax liability, if cumulative amounts were repatriated, would be between $1.8 billion to $2.3 billion as of December 31, 2016.

F- 48

BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Accounting for Uncertainty in Income Taxes
A reconciliation of the beginning and ending amount of our unrecognized tax benefits is summarized as follows:
(In millions)2016 2015 2014
Balance at January 1,$67.9
 $131.5
 $110.1
Additions based on tax positions related to the current period7.2
 10.5
 20.8
Additions for tax positions of prior periods36.3
 19.5
 86.1
Reductions for tax positions of prior periods(13.3) (49.9) (23.4)
Statute expirations(1.4) (1.2) (1.6)
Settlements(64.3) (42.5) (60.5)
Balance at December 31,$32.4
 $67.9
 $131.5
We and our subsidiaries are routinely examined by various taxing authorities. We file income tax returns in the U.S. federal jurisdiction, various U.S. states, and foreign jurisdictions. With few exceptions, including the proposed disallowance we discuss below, we are no longer subject to U.S. federal tax examination for years before 2013 or state, local, or non-U.S. income tax examinations for years before 2005.
Included in the balance of unrecognized tax benefits as of December 31, 2016, 2015 and 2014 are $26.9 million, $15.7 million and $53.6 million (net of the federal benefit on state issues), respectively, of unrecognized tax benefits that, if recognized, would affect the effective income tax rate in future periods.
We recognize potential interest and penalties accrued related to unrecognized tax benefits in income tax expense. In 2016 we recognized a net interest expense of $9.1 million. In 2015 we recognized net interest expense of $3.1 million. In 2014 we recognized a net interest expense of approximately $4.1 million. We have accrued approximately $25.2 million and $12.5 million for the payment of interest as of December 31, 2016 and 2015, respectively.
In March 2015 we received a final assessment from the Danish Tax Authority (SKAT) for fiscal 2009 regarding withholding taxes and the treatment of certain intercompany transactions involving a Danish affiliate and another of our affiliates. In April 2016 we received final assessments from the SKAT for 2011 and 2013 regarding withholding taxes for similar intercompany transactions. The total amount assessed for 2009, 2011 and 2013 is estimated to be $58.3 million, including interest. For the assessments related to 2011 and 2013 we have made payments to SKAT totaling $12.2 million. We continue to dispute the assessments for all of these periods and believe that the positions taken in our historical filings are valid.
Federal Uncertain Tax Positions
During the year ended December 31, 2015, the net effect of adjustments to one of our uncertain tax positions was a net benefit of approximately $27.0 million, primarily related to the state impact of a federal uncertain tax item.
It is reasonably possible that we will adjust the value of our uncertain tax positions related to our revenues from anti-CD20 therapeutic programs and certain transfer pricing issues as we receive additional information from various taxing authorities, including reaching settlements with the authorities. In addition, the IRS and other national tax authorities routinely examine our intercompany transfer pricing with respect to intellectual property related transactions and it is possible that they may disagree with one or more positions we have taken with respect to such valuations.

F- 49

BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

17.      Other Consolidated Financial Statement Detail
Supplemental Cash Flow Information
Supplemental disclosure of cash flow information for the years ended December 31, 2016, 2015 and 2014, is as follows:
 For the Years Ended December 31,
(In millions)2016 2015 2014
Cash paid during the year for:     
Interest$281.2
 $39.1
 $41.2
Income taxes$1,642.2
 $1,674.8
 $1,163.2
Non-cash Operating, Investing and Financing Activity
In December 2016 we accrued $454.8 million related to the recent settlement and license agreement with Forward Pharma A/S (Forward Pharma). For additional information related to this transaction, please read Note 21, Commitment and Contingencies to these consolidated financial statements.
In the fourth quarter of 2016 we accrued $300.0 million upon reaching $11.0 billion in total cumulative sales of Fumapharm Products. The amount, net of tax benefit, was accounted for as an increase to goodwill in accordance with the accounting standard applicable to business combinations when we acquired Fumapharm and is expected to be paid in the first quarter of 2017. For additional information related to this transaction, please read Note 21, Commitments and Contingencies to these consolidated financial statements.
In connection with the construction of our manufacturing facility in Solothurn, Switzerland, we accrued charges related to processing equipment and engineering services of approximately $100.0 million in our consolidated balance sheet. For additional information related to this transaction, please read Note 10, Property, Plant and Equipment to these consolidated financial statements.
In February 2015 upon completion of our acquisition of Convergence, we recorded a contingent consideration obligation of $274.5 million as part of the purchase price. For additional information related to this transaction, please read Note 2, Acquisitions to these consolidated financial statements.
Other Income (Expense), Net
Components of other income (expense), net, are summarized as follows:
 For the Years Ended December 31,
(In millions)2016 2015 2014
Interest income$63.4
 $22.1
 $12.2
Interest expense(260.0) (95.5) (29.5)
Gain (loss) on investments, net6.0
 (3.8) 11.8
Foreign exchange gains (losses), net(9.8) (32.7) (11.6)
Other, net(17.0) (13.8) (8.7)
Total other income (expense), net$(217.4) $(123.7) $(25.8)
Other Current Assets
Other current assets include prepaid taxes totaling approximately $817.0 million and $550.6 million as of December 31, 2016 and 2015, respectively.

F- 50

BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Accrued Expenses and Other
Accrued expenses and other consists of the following:
 As of December 31,
(In millions)2016 2015
Current portion of contingent consideration obligations$580.8
 $504.7
Accrued TECFIDERA litigation settlement and license charges454.8
 
Revenue-related reserves for discounts and allowances438.6
 518.1
Employee compensation and benefits282.9
 270.8
Royalties and licensing fees195.8
 167.9
Construction in progress134.0
 87.9
Collaboration expenses130.9
 31.2
Other685.7
 516.2
Total accrued expenses and other$2,903.5
 $2,096.8
PricingOut-licensed Patents
Out-licensed patents to third-parties primarily relate to patents acquired in connection with the merger of TYSABRIBiogen, Inc. and IDEC Pharmaceuticals Corporation in Italy - AIFA
In2003. During 2014 we recorded a charge of $34.7 million related to the fourth quarterimpairment of 2011, Biogen Idec Italia SRL,one of our Italian subsidiary, receivedout-licensed patents to reflect a notice from the Italian National Medicines Agency (Agenzia Italiana del Farmaco or AIFA) stating that sales of TYSABRI for the period from mid-February 2009 through mid-February 2011 exceeded by EUR30.7 million a reimbursement limit established pursuantchange in its estimated fair value due to a Price Determination Resolution (Price Resolution) granted by AIFAchange in December 2006. In December 2011,the underlying competitive market for that product. The charge was included in amortization of acquired intangible assets in our consolidated statements of income. The fair value of the intangible asset was based on a discounted cash flow calculated using Level 3 fair value measurements and inputs including estimated revenues. There were no impairment charges related to our interpretation thatout-licensed patents during 2016 or 2015.
Developed Technology
Developed technology primarily relates to our AVONEX product, which was recorded in connection with the Price Resolution by its terms only applied to the first 24 monthsmerger of TYSABRI sales (which beganBiogen, Inc. and IDEC Pharmaceuticals Corporation in mid-February 2007), we filed an appeal against AIFA in administrative court in Rome, Italy seeking a ruling that the reimbursement limit does not apply to the periods beginning in mid-February 2009 and that the position2003. The net book value of AIFA is unenforceable. That appeal is pending. Since being notified in the fourth quarterthis asset as of 2011 that AIFA believed a reimbursement limitDecember 31, 2016, was in effect, we deferred revenue on sales of TYSABRI as if the reimbursement limit were in effect for each biannual period beginning in mid-February 2009.$363.3 million.

F- 2127

BIOGEN IDEC INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

IPR&D

IPR&D represents the fair value assigned to research and development assets that we acquire and have not reached technological feasibility at the date of acquisition. Upon commercialization, we will determine the estimated useful life. In July 2013,connection with our acquisition of Convergence in February 2015, we negotiatedacquired IPR&D programs with an agreementestimated fair value of $424.6 million. This amount has and will be adjusted for foreign exchange rate fluctuations. For a more detailed description of this transaction, please read Note 2, Acquisitions to these consolidated financial statements.
An analysis of anticipated lifetime revenues and anticipated development costs is performed annually during our long- range planning cycle, which was updated in principlethe third quarter of 2016. This analysis is based upon certain assumptions that we evaluate on a periodic basis, including anticipated future product sales, the expected impact of changes in the amount of development costs and the probabilities of our programs succeeding, the introduction of new products by our competitors and changes in our commercial and pipeline product candidates.  
During the fourth quarter of 2016 we terminated our collaboration agreements with AIFA's PriceRodin Therapeutics, Inc. and Reimbursement Committee that would have resolved allAtaxion Inc., resulting in impairment losses of AIFA's claims relating to sales of TYSABRI in excess$8.7 million and $3.5 million, respectively, reflecting the full value of the reimbursement limit forassets recorded upon entering into the periods from February 2009 through January 2013 for an aggregate repaymentcollaboration agreements. These impairment losses are included in amortization of EUR33.3 million. The agreement was sent toacquired intangible assets in our consolidated statements of income.
During the Avvocatura Generale dello Stata (Attorney General) for its opinion. As a resultthird quarter of this agreement in principle,2014 we recorded a liability and reduction to revenueupdated the probabilities of EUR15.4 million at June 30, 2013. That adjustment approximated 50% of the claimsuccess related to the period from February 2009early stage programs acquired through January 2011 as the likelihoodour recent acquisitions. The change in probability of makingsuccess, combined with a payment to resolve AIFA's claims for that period was then probable and the amount could be estimated. This agreement in principle was not finalized, and AIFA and Biogen Idec Italia SRL remain in discussions about a resolution relating to the claims at issue in that agreement in principle. In October 2014, we proposed a revised settlement for the period from February 2009 through January 2013 of EUR35.6 million to be paiddelay in one payment. We continueof the projects, resulted in an impairment loss of $16.2 million in one of our IPR&D assets during 2014. This impairment is included in amortization of acquired intangible assets in our consolidated statements of income.
Acquired and In-licensed Rights and Patents
Acquired and in-licensed rights and patents primarily relate to believe that a settlement with AIFA relating to these claims is probable and have retained the EUR15.4 million liability recorded as of June 30, 2013.
In June 2014, AIFA approved a resolution, effective for a 24 month term, setting the price for TYSABRI in Italy. The resolution also eliminated the reimbursement limit from February 2013 going forward. As a result, we recognized $53.5 million of TYSABRI revenues related to the periods beginning February 2013 that were previously deferred. An aggregate amount of $77.6 million remains deferred as of December 31, 2014 related to the periods from mid-February 2011 through January 2013.
5.    Reserves for Discounts and Allowances
As a result of our acquisition of all remaining rights to TYSABRI from Elan we began recognizing reservesCorporation plc (Elan). The net book value of this asset as of December 31, 2016, was $2,493.2 million.
The net change in acquired and in-licensed rights and patents during the year ended December 31, 2016, reflects:
$60.0 million milestone payment due to Ionis Pharmaceuticals, Inc. (Ionis) for discounts and allowances for U.S. TYSABRI revenuethe approval of SPINRAZA in the second quarterU.S. in December 2016;
$50.0 million in total milestone payments due to Samsung Bioepis, which became payable upon the approval of 2013. Prior periods included reserves for discountsBENEPALI and allowances for restFLIXABI in the E.U. in January 2016 and May 2016, respectively;
$32.0 million in total milestone payments due to AbbVie, Inc. (AbbVie), which became payable upon the approval of world TYSABRI revenueZINBRYTA in the U.S. in May 2016 and worldwide AVONEX revenue. In addition, following our commercial launchesthe E.U. in July 2016; and
$26.5 million upon the approval of recent products, we began recognizing reserves for discountsALPROLIX in the E.U. in May 2016 which is comprised of a $20.0 million contingent payment due to the former owners of Syntonix Pharmaceuticals, Inc. (Syntonix) and allowances$6.5 million related to these products' revenue. Gross product revenues forthe establishment of a corresponding deferred tax liability.
For additional information on our relationships with Samsung Bioepis, AbbVie and Ionis, please read Note 19, 2012Collaborative and Other Relationships include salesto these consolidated financial statements.
Estimated Future Amortization of TYSABRI to Elan under our collaboration agreement, which did not have any corresponding reserves for discounts and allowances.Intangible Assets
AnOur amortization expense is based on the economic consumption of intangible assets. Our most significant intangible assets are related to our AVONEX and TYSABRI products. Annually, during our long-range planning cycle, we perform an analysis of anticipated lifetime revenues of AVONEX and TYSABRI. This analysis is also updated whenever events or changes in circumstances would significantly affect the change in reserves is summarized as follows:anticipated lifetime revenues of either product.

(In millions)Discounts 
Contractual
Adjustments
 Returns Total
2014       
Beginning balance$47.0
 $335.6
 $33.7
 $416.3
Current provisions relating to sales in current year347.3
 1,258.8
 39.1
 1,645.2
Adjustments relating to prior years(1.0) (27.2) 13.5
 (14.7)
Payments/returns relating to sales in current year(299.7) (933.4) (4.1) (1,237.2)
Payments/returns relating to sales in prior years(46.0) (261.9) (33.1) (341.0)
Ending balance$47.6
 $371.9
 $49.1
 $468.6
(In millions)Discounts 
Contractual
Adjustments
 Returns Total
2013       
Beginning balance$14.3
 $196.0
 $26.8
 $237.1
Current provisions relating to sales in current year236.3
 851.4
 22.9
 1,110.6
Adjustments relating to prior years(0.7) (16.4) 1.1
 (16.0)
Payments/returns relating to sales in current year(189.7) (560.4) 
 (750.1)
Payments/returns relating to sales in prior years(13.2) (135.0) (17.1) (165.3)
Ending balance$47.0
 $335.6
 $33.7
 $416.3

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BIOGEN IDEC INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


(In millions)Discounts 
Contractual
Adjustments
 Returns Total
2012       
Beginning balance$11.9
 $120.0
 $23.7
 $155.6
Current provisions relating to sales in current year96.5
 534.2
 22.0
 652.7
Adjustments relating to prior years(0.3) (4.7) (0.1) (5.1)
Payments/returns relating to sales in current year(83.6) (363.2) (4.3) (451.1)
Payments/returns relating to sales in prior years(10.2) (90.3) (14.5) (115.0)
Ending balance$14.3
 $196.0
 $26.8
 $237.1
The total reserves above, includedOur most recent long range planning cycle was completed in our consolidated balance sheets, are summarizedthe third quarter of 2016. Based upon this analysis, the estimated future amortization of acquired intangible assets is expected to be as follows:
 As of December 31,
(In millions)2014 2013
Reduction of accounts receivable$124.6
 $151.4
Component of accrued expenses and other344.0
 264.9
Total reserves$468.6
 $416.3
(In millions)As of December 31, 2016
2017$334.8
2018312.7
2019295.2
2020259.7
2021242.8
6.    Inventory
Goodwill
The componentsfollowing table provides a roll forward of inventory are summarized as follows:the changes in our goodwill balance:
 As of December 31,
(In millions)2014 2013
Raw materials$128.3
 $115.0
Work in process511.5
 435.4
Finished goods164.2
 108.6
Total inventory$804.0
 $659.0
 As of December 31,
(In millions)2016 2015
Goodwill, beginning of year$2,663.8
 $1,760.2
Increase to goodwill1,026.9
 908.1
Other(21.4) (4.5)
Goodwill, end of year$3,669.3
 $2,663.8
The increase in goodwill during 2016 was related to $1.2 billion in contingent milestones achieved (exclusive of $173.1 million in tax benefits) and payable to the former shareholders of Fumapharm AG or holders of their rights. Other includes changes related to foreign exchange rate fluctuations. The increase in goodwill during 2015 was related to $900.0 million in contingent milestones achieved (exclusive of $120.2 million in tax benefits) and payable to the former shareholders of Fumapharm AG or holders of their rights and $128.3 million related to our acquisition of Convergence.
AsFor additional information related to future contingent payments to the former shareholders of December 31, 2014 our inventory includes $6.3 million associated with our ZINBRYTA (daclizumab high yield process) program, which has been capitalized in advanceFumapharm AG or holders of regulatory approval. As of December 31, 2013, our inventory included $93.7 million associated with our ELOCTATE, ALPROLIX and PLEGRIDY programs, which were capitalized in advance of regulatory approval. ELOCTATE, ALPROLIX and PLEGRIDY were approved during 2014. For information on our pre-approval inventory policy,their rights, please read Note 1,21, Summary of Significant Accounting PoliciesCommitments and Contingencies to these consolidated financial statements
Amounts written downstatements. For additional information related to excess, obsolete, unmarketable or other inventory are chargedour acquisition of Convergence, please read Note 2, Acquisitions to costthese consolidated financial statements.
As of sales, and totaled $50.6 million, $47.3 million, and $24.8 million for the years ended December 31, 2014, 2013, and 2012, respectively.2016, we had no accumulated impairment losses related to goodwill.

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BIOGEN IDEC INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


7.    Intangible Assets and Goodwill
Intangible Assets7.        Fair Value Measurements
IntangibleThe tables below present information about our assets netand liabilities that are regularly measured and carried at fair value and indicate the level within the fair value hierarchy of accumulated amortization, impairment chargesthe valuation techniques we utilized to determine such fair value:
(In millions)As of
December 31,
2016
 
Quoted
Prices in
Active
Markets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Assets:       
Cash equivalents$2,039.6
 $
 $2,039.6
 $
Marketable debt securities:       
Corporate debt securities2,663.8
 
 2,663.8
 
Government securities2,172.5
 
 2,172.5
 
Mortgage and other asset backed securities561.7
 
 561.7
 
Marketable equity securities24.9
 24.9
 
 
Derivative contracts61.0
 
 61.0
 
Plan assets for deferred compensation34.5
 
 34.5
 
Total$7,558.0
 $24.9
 $7,533.1
 $
Liabilities:       
Derivative contracts$13.6
 $
 $13.6
 $
Contingent consideration obligations467.6
 
 
 467.6
Total$481.2
 $
 $13.6
 $467.6
(In millions)As of
December 31,
2015
 
Quoted
Prices
in Active
Markets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Assets:       
Cash equivalents$909.5
 $
 $909.5
 $
Marketable debt securities:       
Corporate debt securities1,510.9
 
 1,510.9
 
Government securities2,875.9
 
 2,875.9
 
Mortgage and other asset backed securities494.1
 
 494.1
 
Marketable equity securities37.5
 37.5
 
 
Derivative contracts27.2
 
 27.2
 
Plan assets for deferred compensation40.1
 
 40.1
 
Total$5,895.2
 $37.5
 $5,857.7
 $
Liabilities:       
Derivative contracts$14.7
 $
 $14.7
 $
Contingent consideration obligations506.0
 
 
 506.0
Total$520.7
 $
 $14.7
 $506.0
The fair value of Level 2 instruments classified as cash equivalents and adjustments,marketable debt securities were determined through third-party pricing services. For a description of our validation procedures related to prices provided by third-party pricing services, refer to Note 1, Summary of Significant Accounting Policies: Fair Value Measurements, to these consolidated financial statements.

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Debt Instruments
The fair values of our debt instruments, which are Level 2 liabilities, are summarized as follows:
   As of December 31, 2014 As of December 31, 2013
(In millions)Estimated Life Cost 
Accumulated
Amortization
 Net Cost 
Accumulated
Amortization
 Net
Out-licensed patents13-23 years $543.3
 $(481.7) $61.6
 $578.0
 $(450.8) $127.2
Developed technology15-23 years 3,005.3
 (2,396.8) 608.5
 3,005.3
 (2,165.4) 839.9
In-process research and developmentIndefinite until commercialization 314.1
 
 314.1
 327.4
 
 327.4
Trademarks and tradenamesIndefinite 64.0
 
 64.0
 64.0
 
 64.0
Acquired and in-licensed rights and patents6-17 years 3,280.4
 (300.1) 2,980.3
 3,240.0
 (123.8) 3,116.2
Total intangible assets  $7,207.1
 $(3,178.6) $4,028.5
 $7,214.7
 $(2,740.0) $4,474.7
 As of December 31,
(In millions)2016 2015
Notes payable to Fumedica$6.1
 $9.4
6.875% Senior Notes due March 1, 2018583.7
 602.6
2.900% Senior Notes due September 15, 20201,521.5
 1,497.5
3.625% Senior Notes due September 15, 20221,026.6
 1,014.2
4.050% Senior Notes due September 15, 20251,796.0
 1,764.6
5.200% Senior Notes due September 15, 20451,874.5
 1,757.6
Total$6,808.4
 $6,645.9
AmortizationThe fair value of acquiredour notes payable to Fumedica was estimated using market observable inputs, including current interest and foreign currency exchange rates. The fair values of each of our series of Senior Notes were determined through market, observable, and corroborated sources. For additional information related to our debt instruments, please read Note 11, Indebtedness to these consolidated financial statements.
Contingent Consideration Obligations
The following table provides a roll forward of the fair values of our contingent consideration obligations which includes Level 3 measurements:
 As of December 31,
(In millions)2016 2015
Fair value, beginning of year$506.0
 $215.5
Additions
 274.5
Changes in fair value14.8
 30.5
Payments and other(53.2) (14.5)
Fair value, end of year$467.6
 $506.0
As of December 31, 2016 and 2015, approximately $246.8 million and $301.3 million, respectively, of the fair value of our total contingent consideration obligations was reflected as a component of other long-term liabilities in our consolidated balance sheets with the remaining balance reflected as a component of accrued expenses and other. Payments and other for 2016 includes $7.9 million of a Convergence milestone converted to a short-term obligation under the terms of the acquisition agreement.
There were no changes in valuation techniques or transfers between fair value measurement levels during the years ended December 31, 2016 and 2015. The fair values of the intangible assets totaledand contingent consideration liabilities were based on a probability-adjusted discounted cash flow calculation using Level 3 fair value measurements and inputs including estimated revenues and probabilities of success. For additional information related to the valuation techniques and inputs utilized in valuation of our financial assets and liabilities, please read Note 1, $489.8Summary of Significant Accounting Policies to these consolidated financial statements.
Convergence
In connection with our acquisition of Convergence in February 2015 we recorded a contingent consideration obligation of $274.5 million. This valuation was based on probability weighted net cash outflow projections of $450.0 million, discounted using a rate of 2.0%, which was the estimated cost of debt financing for market participants. This liability reflected the revised estimate from the date of acquisition for our initial clinical development plans, resulting probabilities of success and the timing of certain milestone payments. For a more detailed description of this transaction, please read Note 2, Acquisitions to these consolidated financial statements.
As of December 31, 2016 and 2015, the fair value of this contingent consideration obligation was $258.9 million and $297.5 million, respectively. Our most recent valuation was determined based upon probability weighted net cash flow projections of $400.0 million, discounted using a rate of 2.7%, which is a measure of the credit risk associated with settling the liability.

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

For 2016 compared to 2015, the net decrease in the fair value of this obligation was primarily due to achievement of a $50.0 million milestone related to a second indication, partially offset by changes in the discount rate and an increase in the probability of success related to the achievement of certain developmental milestones. Approximately $148.4 million is reflected as a component of accrued expenses and other in our consolidated balance sheets as we expect to make the payment within one year.
Stromedix Inc.
In connection with our acquisition of Stromedix Inc. (Stromedix) in March 2012 we recorded a contingent consideration obligation of $122.2 million. As of December 31, 2016 and 2015, the fair value of this contingent consideration obligation was $133.2 million and $131.5 million, respectively. Our most recent valuation was determined based upon probability weighted net cash outflow projections of $419.0 million, discounted using a rate of 2.2%, which is a measure of the credit risk associated with settling the liability.
For 2016 compared to 2015, the net increase in the fair value of this obligation was primarily due to changes in the discount rate, partially offset by changes in the expected timing related to the achievement of certain remaining developmental milestones. Approximately $56.9 million is reflected as a component of accrued expenses and other in our consolidated balance sheets as we expect to make the payment within one year.
Biogen Idec International Neuroscience GmbH
In connection with our acquisition of Biogen Idec International Neuroscience GmbH (BIN), formerly Panima Pharmaceuticals AG (Panima), in December 2010 we recorded a contingent consideration obligation of $81.2 million. As of December 31, 2016 and 2015, the fair value of this contingent consideration obligation was $75.5 million and $77.0 million, respectively. Our most recent valuation was determined based upon probability weighted net cash outflow projections of $361.7 million, discounted using a rate of 2.7%, which is a measure of the credit risk associated with settling the liability.
For 2016 compared to 2015, the net decrease in the fair value of this obligation was primarily due to payment of $3.3 million in developmental milestones, partially offset by changes in the discount rate. Approximately $15.5 million is reflected as a component of accrued expenses and other in our consolidated balance sheets as we expect to make the payment within one year.
Acquired IPR&D
In connection with our acquisition of Convergence, we also allocated $424.6 million of the total purchase price to acquired IPR&D, which was capitalized as an intangible asset. The amount allocated to acquired IPR&D was based on significant inputs not observable in the market and thus represented a Level 3 fair value measurement. This estimate was also adjusted from our preliminary estimate as of the date of acquisition to reflect revised estimates to our initial clinical development plans, resulting probabilities of success and the timing of certain milestone payments. These assets will be tested for impairment annually until commercialization, after which time the IPR&D will be amortized over its estimated useful life. For a more detailed description of this transaction, please read Note 2, $342.9Acquisitions to these consolidated financial statements.
8.    Financial Instruments
The following table summarizes our financial assets with maturities of less than 90 days from the date of purchase included in cash and cash equivalents on the accompanying consolidated balance sheet:
 As of December 31,
(In millions)2016 2015
Commercial paper$31.0
 $21.9
Overnight reverse repurchase agreements
 134.7
Money market funds741.7
 673.8
Short-term debt securities1,266.9
 79.1
Total$2,039.6
 $909.5

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

The carrying values of our commercial paper, including accrued interest, overnight reverse repurchase agreements, money market funds and our short-term debt securities approximate fair value due to their short term maturities. Our overnight reverse repurchase agreements were collateralized with agency-guaranteed mortgage-backed securities and represented approximately 0.7% of total assets as of December 31, 2015.
The following tables summarize our marketable debt and equity securities, classified as available for sale:
As of December 31, 2016 (In millions)
Fair
Value
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Amortized
Cost
Corporate debt securities       
Current$1,408.6
 $0.2
 $(0.6) $1,409.0
Non-current1,255.2
 1.2
 (4.7) 1,258.7
Government securities       
Current1,156.0
 0.2
 (0.3) 1,156.1
Non-current1,016.5
 0.5
 (3.4) 1,019.4
Mortgage and other asset backed securities       
Current4.0
 
 
 4.0
Non-current557.7
 0.8
 (2.2) 559.1
Total marketable debt securities$5,398.0
 $2.9
 $(11.2) $5,406.3
Marketable equity securities, non-current$24.9
 $0.7
 $(9.3) $33.5
As of December 31, 2015 (In millions)
Fair
Value
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Amortized
Cost
Corporate debt securities       
Current$394.3
 $
 $(0.5) $394.8
Non-current1,116.6
 0.1
 (4.1) 1,120.6
Government securities       
Current1,723.4
 0.1
 (1.1) 1,724.4
Non-current1,152.5
 
 (3.1) 1,155.6
Mortgage and other asset backed securities       
Current2.8
 
 
 2.8
Non-current491.3
 0.1
 (1.8) 493.0
Total marketable debt securities$4,880.9
 $0.3
 $(10.6) $4,891.2
Marketable equity securities, non-current$37.5
 $9.2
 $
 $28.3
Summary of Contractual Maturities: Available-for-Sale Securities
The estimated fair value and amortized cost of our marketable debt securities available-for-sale by contractual maturity are summarized as follows:
 As of December 31, 2016 As of December 31, 2015
(In millions)
Estimated
Fair  Value
 
Amortized
Cost
 
Estimated
Fair  Value
 
Amortized
Cost
Due in one year or less$2,568.6
 $2,569.1
 $2,120.5
 $2,122.0
Due after one year through five years2,552.6
 2,559.7
 2,575.9
 2,583.9
Due after five years276.8
 277.5
 184.5
 185.3
Total available-for-sale securities$5,398.0
 $5,406.3
 $4,880.9
 $4,891.2
The average maturity of our marketable debt securities available-for-sale as of December 31, 2016 and 2015 was 12 months and 16 months, respectively.

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Proceeds from Marketable Debt Securities
The proceeds from maturities and sales of marketable debt securities and resulting realized gains and losses are summarized as follows:
 For the Years Ended December 31,
(In millions)2016 2015 2014
Proceeds from maturities and sales$7,378.9
 $4,063.0
 $2,718.9
Realized gains$3.3
 $1.5
 $0.7
Realized losses$4.3
 $3.5
 $0.5
Realized losses for the year ended December 31, 2016, primarily relate to sales of corporate bonds, agency mortgage-backed securities and other asset-backed securities. Realized losses for the year ended December 31, 2015, primarily relate to sales of corporate bonds, agency mortgage-backed securities and other asset-backed securities. Realized losses for the year ended December 31, 2014, primarily relate to sales of agency mortgage-backed securities and government securities.
Strategic Investments
As of December 31, 2016 and 2015, our strategic investment portfolio was comprised of investments totaling $99.9 million and $96.0 million, respectively, which are included in investments and other assets in our consolidated balance sheets. Our strategic investment portfolio includes investments in equity securities of certain biotechnology companies and investments in venture capital funds where the underlying investments are in equity securities of biotechnology companies.
9.    Derivative Instruments
Foreign Currency Forward Contracts - Hedging Instruments
Due to the global nature of our operations, portions of our revenues and operating expenses are recorded in currencies other than the U.S. dollar. The value of revenues and operating expenses measured in U.S. dollars is therefore subject to changes in foreign currency exchange rates. In order to mitigate these changes we use foreign currency forward contracts to lock in exchange rates associated with a portion of our forecasted international revenues and operating expenses.
Foreign currency forward contracts in effect as of December 31, 2016 and 2015, had durations of 1 to 18 months, respectively. These contracts have been designated as cash flow hedges and accordingly, to the extent effective, any unrealized gains or losses on these foreign currency forward contracts are reported in accumulated other comprehensive income (loss) (referred to as AOCI in the tables below). Realized gains and losses for the effective portion of such contracts are recognized in revenue when the sale of product in the currency being hedged is recognized and, beginning in the fourth quarter of 2015, in operating expenses when the expense in the currency being hedged is recorded. To the extent ineffective, hedge transaction gains and losses are reported in other income (expense), net.
The notional value of foreign currency forward contracts that were entered into to hedge forecasted revenues and $202.2operating expenses is summarized as follows:
 
Notional Amount
As of December 31,
Foreign Currency: (In millions)2016 2015
Euro$871.7
 $945.5
Swiss francs
 80.8
Canadian dollar
 76.7
Total foreign currency forward contracts$871.7
 $1,103.0

F- 34

BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

The portion of the fair value of these foreign currency forward contracts that was included in accumulated other comprehensive income (loss) in total equity reflected net gains of $49.8 million, $1.8 million and $72.1 million for the years ended December 31, 2016, 2015 and 2014, respectively. We expect all contracts to be settled over the next 18 months and any amounts in accumulated other comprehensive income (loss) to be reported as an adjustment to revenue or operating expense. We consider the impact of our and our counterparties’ credit risk on the fair value of the contracts as well as the ability of each party to execute its contractual obligations. As of December 31, 2016 and 2015, credit risk did not change the fair value of our foreign currency forward contracts.
The following table summarizes the effect of foreign currency forward contracts designated as hedging instruments on our consolidated statements of income:
For the Years Ended December 31,
Net Gains/(Losses)
Reclassified from AOCI into Net Income
(Effective Portion)
 
Net Gains/(Losses)
Recognized into Net Income
(Ineffective Portion)
Location 2016 2015 2014 Location 2016 2015 2014
Revenue $5.3
 $173.2
 $6.8
 Other income (expense) $2.9
 $4.9
 $(1.5)
Operating expenses $(1.5) $
 $
 Other income (expense) $0.1
 $
 $
Interest Rate Contracts - Hedging Instruments
We have entered into interest rate lock contracts or interest rate swap contracts on certain borrowing transactions to manage our exposure to interest rate changes and to reduce our overall cost of borrowing.
Interest Rate Lock Contracts
During 2015 we entered into treasury rate locks, with an aggregated notional amount of $1.1 billion, which were designated as cash flow hedges to hedge against changes in the 10-year and 30-year U.S. treasury interest rates that could have impacted our anticipated debt offering. In connection with the issuance of our 4.05% and 5.20% Senior Notes, as described in Note 11, Indebtedness, we settled the treasury rate locks and realized an $8.5 million gain. As the hedging relationship was effective, the gain was recorded in AOCI and will be recognized in other income (expense), net over the life of the 4.05% and 5.20% Senior Notes.
Interest Rate Swap Contracts
In connection with the issuance of our 2.90% Senior Notes, as described in Note 11, 2013 and 2012Indebtedness, we entered into interest rate swaps with an aggregate notional amount of $675.0 million, which expire on September 15, 2020. The interest rate swap contracts are designated as hedges of the fair value changes in the 2.90% Senior Notes attributable to changes in interest rates. Since the specific terms and notional amount of the swaps match the debt being hedged, it is assumed to be a highly effective hedge and all changes in the fair value of the swaps are recorded as a component of the 2.90% Senior Notes with no net impact recorded in income. Any net interest payments made or received on the interest rate swap contracts are recognized as a component of interest expense in our consolidated statements of income.
Foreign Currency Forward Contracts - Other Derivatives
We also enter into other foreign currency forward contracts, usually with durations of one month or less, to mitigate the foreign currency risk related to certain balance sheet positions. We have not elected hedge accounting for these transactions.
The aggregate notional amount of these outstanding foreign currency contracts was $902.1 million and $721.0 million as of December 31, 2016 and 2015, respectively. Net losses of $29.2 million, $23.8 million and $15.5 million related to these contracts were recognized as a component of other income (expense), net, for the years ended December 31, 2016, 2015 and 2014, respectively.
Summary of Derivatives
While certain of our derivatives are subject to netting arrangements with our counterparties, we do not offset derivative assets and liabilities in our consolidated balance sheets.

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

The following table summarizes the fair value and presentation in our consolidated balance sheets of our outstanding derivatives including those designated as hedging instruments:
(In millions)Balance Sheet LocationFair Value
As of December 31, 2016
Hedging Instruments:  
Asset derivativesOther current assets$50.4
 Investments and other assets$6.6
Liability derivativesOther long-term liabilities$4.6
Other Derivatives:  
Asset derivativesOther current assets$4.0
Liability derivativesAccrued expenses and other$9.0
(In millions)Balance Sheet LocationFair Value
As of December 31, 2015
Hedging Instruments:  
Asset derivativesOther current assets$16.6
 Investments and other assets$0.3
Liability derivativesAccrued expenses and other$10.2
 Other long-term liabilities$2.5
Other Derivatives:  
Asset derivativesOther current assets$10.3
Liability derivativesAccrued expenses and other$2.0
10.      Property, Plant and Equipment
Property, plant and equipment are recorded at historical cost, net of accumulated depreciation. Components of property, plant and equipment, net are summarized as follows:
 As of December 31,
(In millions)2016 2015
Land$137.8
 $74.7
Buildings1,107.8
 1,035.6
Leasehold improvements123.7
 166.6
Machinery and equipment1,105.8
 1,079.6
Computer software and hardware746.8
 647.1
Furniture and fixtures60.6
 72.9
Construction in progress658.6
 441.2
Total cost3,941.1
 3,517.7
Less: accumulated depreciation(1,439.3) (1,330.1)
Total property, plant and equipment, net$2,501.8
 $2,187.6
Depreciation expense totaled $309.3 million, $217.9 million and $198.4 million for 2016, 2015 and 2014, respectively.
For 2016, 2015 and 2014, we capitalized interest costs related to construction in progress totaling approximately $12.9 million, $10.4 million and $6.4 million, respectively.
Solothurn, Switzerland Facility
During the first quarter of 2016 we closed on the purchase of land in Solothurn, Switzerland for 64.4 million Swiss Francs (approximately $62.5 million). We are building a biologics manufacturing facility on this land in the Commune of Luterbach over the next several years. As of December 31, 2016 and 2015, we had approximately $481.5 million and $99.0 million, respectively, capitalized as construction in progress related to the construction of this facility.

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Research Triangle Park Facility Purchase
On August 24, 2015, we purchased from Eisai, Inc. (Eisai) its drug product manufacturing facility and supporting infrastructure in Research Triangle Park (RTP), North Carolina for $104.8 million. The purchase price consisted of $58.6 million for buildings, $25.9 million for machinery and equipment and $20.3 million for land.
On August 24, 2015, we also amended our existing 10-year lease related to Eisai's oral solid dose products manufacturing facility in RTP, North Carolina where we manufacture our and Eisai's oral solid dose products. As amended, the lease provides for a three-year term and our agreement to purchase the facility upon expiration of the lease term and Eisai's completion of certain activities. Accordingly, we recorded the assets along with a corresponding financing obligation on our consolidated balance sheet for $20.3 million, the net present value of the future minimum lease payments. The assets were recorded as a component of buildings and machinery and equipment. We expect to complete the purchase of the oral solid products manufacturing facility at the end of the lease term in the third quarter of 2018.
11.     Indebtedness
Our indebtedness is summarized as follows:
 As of December 31,
(In millions)2016 2015
Current portion:   
Notes payable to Fumedica$3.0
 $3.1
Financing arrangement for the purchase of the RTP facility1.7
 1.7
Current portion of notes payable and other financing arrangements$4.7
 $4.8
Non-current portion:   
6.875% Senior Notes due March 1, 2018$558.5
 $565.3
2.900% Senior Notes due September 15, 20201,485.3
 1,485.5
3.625% Senior Notes due September 15, 2022993.2
 992.2
4.050% Senior Notes due September 15, 20251,734.8
 1,733.4
5.200% Senior Notes due September 15, 20451,721.5
 1,721.1
Notes payable to Fumedica3.0
 5.9
Financing arrangement for the purchase of the RTP facility16.4
 18.1
Non-current portion of notes payable and other financing arrangements$6,512.7
 $6,521.5
The following is a summary of our principal indebtedness as of December 31, 2016:
$550.0 million aggregate principal amount of 6.875% Senior Notes due March 1, 2018, valued at 99.184% of par;
$1.5 billion aggregate principal amount of 2.90% Senior Notes due September 15, 2020, valued at 99.792% of par;
$1.0 billion aggregate principal amount of 3.625% Senior Notes due September 15, 2022, valued at 99.920% of par;
$1.75 billion aggregate principal amount of 4.05% Senior Notes due September 15, 2025, valued at 99.764% of par; and
$1.75 billion aggregate principal amount of 5.20% Senior Notes due September 15, 2045, valued at 99.294% of par.
The costs associated with these offerings of approximately $52.0 million have been recorded as a reduction to the carrying amount of the debt on our consolidated balance sheet. These costs along with the discounts will be amortized as additional interest expense using the effective interest rate method over the period from issuance through maturity.
These notes are senior unsecured obligations. The notes may be redeemed at our option at any time at 100% of the principal amount plus accrued interest and a specified make-whole amount. The 6.875% Senior Notes due in

F- 37

BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

2018 contain a change of control provision that may require us to purchase the notes under certain circumstances. There is also an interest rate adjustment feature that requires us to pay interest at an increased rate on the notes if the credit rating on the notes declines below investment grade. The remaining Senior Notes contain a change of control provision that may require us to purchase the notes at a price equal to 101% of the principal amount plus accrued and unpaid interest to the date of purchase under certain circumstances.
In connection with the 2.90% Senior Notes offering due in 2020, we entered into interest rate swap contracts. The carrying value of the 2.90% Senior Notes includes approximately $4.6 million related to changes in the fair value of these contracts. For additional information, please read Note 9, Derivative Instruments, to these consolidated financial statements.
In connection with the 6.875% Senior Notes due in 2018, we entered into interest rate swap contracts where we received a fixed rate and paid a variable rate. These contracts were terminated in December 2008. Upon termination of these swaps, the carrying amount of the 6.875% Senior Notes due in 2018 was increased by $62.8 million and is being amortized using the effective interest rate method over the remaining life of the Senior Notes and is being recognized as a reduction of interest expense. As of December 31, 2016, $9.9 million remains to be amortized.
Notes Payable to Fumedica
In connection with our 2006 distribution agreement with Fumedica, we issued notes totaling 61.4 million Swiss Francs which were payable to Fumedica in varying amounts from June 2008 through June 2018. Our remaining note payable to Fumedica had a carrying value of 6.2 million Swiss Francs ($6.0 million) and 8.9 million Swiss Francs ($9.0 million) as of December 31, 2016 and 2015, respectively.
Credit Facility
In August 2015 we entered into a $1.0 billion, five-year senior unsecured revolving credit facility under which we are permitted to draw funds for working capital and general corporate purposes. The terms of the revolving credit facility include a financial covenant that requires us not to exceed a maximum consolidated leverage ratio. As of December 31, 2016, we had no outstanding borrowings and were in compliance with all covenants under this facility.
Financing Arrangement
During 2015 we recorded a financing obligation in relation to the amendment of our lease agreement of Eisai's oral solid dose products manufacturing facility in RTP, North Carolina where we manufacture our and Eisai's oral solid dose products. As of December 31, 2016 and 2015, the financing obligation totaled approximately $18.1 million and $19.8 million, respectively. For additional information, please read Note 10, Property, Plant and Equipment to these consolidated financial statements.
Debt Maturity
The total gross payments, excluding our financing arrangement, due under our debt arrangements are as follows:
(In millions)As of December 31, 2016
2017$3.1
2018553.1
2019
20201,500.0
2021
2022 and thereafter4,500.0
Total$6,556.2
The fair value of our debt is disclosed in Note 7, Fair Value Measurements to these consolidated financial statements.

F- 38

BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

12.      Equity
Preferred Stock
We have 8.0 million shares of Preferred Stock authorized, of which 1.75 million shares are authorized as Series A, 1.0 million shares are authorized as Series X junior participating and 5.25 million shares are undesignated. Shares may be issued without a vote or action of stockholders from time to time in classes or series with the designations, powers, preferences, and the relative, participating, optional or other special rights of the shares of each such class or series and any qualifications, limitations or restrictions thereon as set forth in the instruments governing such shares. Any such Preferred Stock may rank prior to common stock as to dividend rights, liquidation preference or both, and may have full or limited voting rights and may be convertible into shares of common stock. No shares of Preferred Stock were issued and outstanding during 2016, 2015 and 2014.
Common Stock
The following table describes the number of shares authorized, issued and outstanding of our common stock as of December 31, 2016 and 2015:
 As of December 31, 2016 As of December 31, 2015
(In millions)Authorized Issued Outstanding Authorized Issued Outstanding
Common stock1,000.0
 238.5
 215.9
 1,000.0
 241.2
 218.6
Share Repurchases
In July 2016 our Board of Directors authorized a program to repurchase up to $5.0 billion of our common stock (2016 Share Repurchase Program). This authorization does not have an expiration date. Repurchased shares will be retired. As of December 31, 2016, we repurchased and retired 3.3 million shares of common stock at a cost of $1.0 billion under our 2016 Share Repurchase Program.
In May 2015 our Board of Directors authorized a program to repurchase up to $5.0 billion of our common stock (2015 Share Repurchase Program), which was completed as of December 31, 2015. As of December 31, 2015, we repurchased and retired approximately 16.8 million shares of common stock at a cost of $5.0 billion under our 2015 Share Repurchase Program.
In February 2011 our Board of Directors authorized a program to repurchase up to 20.0 million shares of our common stock (2011 Share Repurchase Program), which has been used principally to offset common stock issuances under our share-based compensation plans. The 2011 Share Repurchase Program does not have an expiration date. We did not repurchase any shares of common stock under our 2011 Share Repurchase Program during the years ended December 31, 2016 and 2015. During 2014 we purchased approximately 2.9 million shares of common stock at a cost of $886.8 million under our 2011 Share Repurchase Program. We have approximately 1.3 million shares remaining available for repurchase under this authorization.
13.      Accumulated Other Comprehensive Income (Loss)
The following table summarizes the changes in accumulated other comprehensive income (loss), net of tax by component:
(In millions)Unrealized Gains (Losses) on Securities Available for Sale Unrealized Gains (Losses) on Cash Flow Hedges Unfunded Status of Postretirement Benefit Plans Translation Adjustments Total
Balance, December 31, 2015$(0.8) $10.2
 $(37.8) $(195.6) $(224.0)
Other comprehensive income (loss) before reclassifications(10.6) 51.6
 5.1
 (138.6) (92.5)
Amounts reclassified from accumulated other comprehensive income (loss)0.6
 (4.0) 
 
 (3.4)
Net current period other comprehensive income (loss)(10.0) 47.6
 5.1
 (138.6) (95.9)
Balance, December 31, 2016$(10.8) $57.8
 $(32.7) $(334.2) $(319.9)

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(In millions)Unrealized Gains (Losses) on Securities Available for Sale Unrealized Gains (Losses) on Cash Flow Hedges Unfunded Status of Postretirement Benefit Plans Translation Adjustments Total
Balance, December 31, 2014$(0.4) $71.7
 $(31.6) $(99.2) $(59.5)
Other comprehensive income (loss) before reclassifications(1.7) 110.8
 (6.2) (96.4) 6.5
Amounts reclassified from accumulated other comprehensive income (loss)1.3
 (172.3) 
 
 (171.0)
Net current period other comprehensive income (loss)(0.4) (61.5) (6.2) (96.4) (164.5)
Balance, December 31, 2015$(0.8) $10.2
 $(37.8) $(195.6) $(224.0)
(In millions)Unrealized Gains (Losses) on Securities Available for Sale Unrealized Gains (Losses) on Cash Flow Hedges Unfunded Status of Postretirement Benefit Plans Translation Adjustments Total
Balance, December 31, 2013$5.6
 $(23.7) $(19.6) $10.0
 $(27.7)
Other comprehensive income (loss) before reclassifications0.4
 101.7
 (12.0) (109.2) (19.1)
Amounts reclassified from accumulated other comprehensive income (loss)(6.4) (6.3) 
 
 (12.7)
Net current period other comprehensive income (loss)(6.0) 95.4
 (12.0) (109.2) (31.8)
Balance, December 31, 2014$(0.4) $71.7
 $(31.6) $(99.2) $(59.5)
The following table summarizes the amounts reclassified from accumulated other comprehensive income:
(In millions)Income Statement Location
Amounts Reclassified from
Accumulated Other Comprehensive Income
For the Years Ended December 31,
2016 2015 2014
Gains (losses) on securities available for saleOther income (expense)$(0.9) $(2.0) $9.9
 Income tax benefit (expense)0.3
 0.7
 (3.5)
       
Gains (losses) on cash flow hedgesRevenues5.3
 173.2
 6.8
 Operating expenses(1.5) 
 
 Other income (expense)0.2
 (0.1) 
 Income tax benefit (expense)
 (0.8) (0.5)
       
Total reclassifications, net of tax $3.4
 $171.0
 $12.7

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

14.      Earnings per Share
Basic and diluted earnings per share are calculated as follows:
 For the Years Ended December 31,
(In millions)2016 2015 2014
Numerator:     
Net income attributable to Biogen Inc.$3,702.8
 $3,547.0
 $2,934.8
Denominator:     
Weighted average number of common shares outstanding218.4
 230.7
 236.4
Effect of dilutive securities:     
Stock options and employee stock purchase plan0.1
 0.1
 0.1
Time-vested restricted stock units0.2
 0.3
 0.5
Market stock units0.1
 0.1
 0.2
Dilutive potential common shares0.4
 0.5
 0.8
Shares used in calculating diluted earnings per share218.8
 231.2
 237.2
Amounts excluded from the calculation of net income per diluted share because their effects were anti-dilutive were insignificant.
Earnings per share for the years ended December 31, 2016, 2015 and 2014, reflects, on a weighted average basis, the repurchase of 0.7 million shares, 4.6 million shares and 1.0 million shares, respectively, of our common stock under our share repurchase authorizations.
15.     Share-based Payments
Share-based Compensation Expense
The following table summarizes share-based compensation expense included in our consolidated statements of income:
 For the Years Ended December 31,
(In millions)2016 2015 2014
Research and development$84.5
 $88.6
 $102.1
Selling, general and administrative121.7
 127.3
 150.3
Restructuring charges(1.8) (8.6) 
Subtotal204.4
 207.3
 252.4
Capitalized share-based compensation costs(14.6) (11.0) (10.0)
Share-based compensation expense included in total cost and expenses189.8
 196.3
 242.4
Income tax effect(54.0) (55.8) (72.2)
Share-based compensation expense included in net income attributable to Biogen Inc.$135.8
 $140.5
 $170.2

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

The following table summarizes share-based compensation expense associated with each of our share-based compensation programs:
 For the Years Ended December 31,
(In millions)2016 2015 2014
Market stock units$38.4
 $38.1
 $37.4
Time-vested restricted stock units120.0
 119.0
 115.4
Cash settled performance units16.3
 22.4
 65.5
Performance units18.6
 13.9
 21.9
Employee stock purchase plan11.1
 13.9
 12.2
Subtotal204.4
 207.3
 252.4
Capitalized share-based compensation costs(14.6) (11.0) (10.0)
Share-based compensation expense included in total cost and expenses$189.8
 $196.3
 $242.4
Windfall tax benefits from vesting of stock awards, exercises of stock options and ESPP participation were $12.6 million, $78.2 million and $96.4 million in 2016, 2015 and 2014, respectively. These amounts have been calculated under the alternative transition method.
As of December 31, 2016, unrecognized compensation cost related to unvested share-based compensation was approximately $189.8 million, net of estimated forfeitures. We expect to recognize the cost of these unvested awards over a weighted-average period of 1.9 years.
Share-Based Compensation Plans
We have three share-based compensation plans pursuant to which awards are currently being made: (i) the Biogen Inc. 2006 Non-Employee Directors Equity Plan (2006 Directors Plan); (ii) the Biogen Inc. 2008 Amended and Restated Omnibus Equity Plan (2008 Omnibus Plan); and (iii) the Biogen Inc. 2015 Employee Stock Purchase Plan (ESPP).
Directors Plan
In May 2006 our stockholders approved the 2006 Directors Plan for share-based awards to our directors. Awards granted from the 2006 Directors Plan may include stock options, shares of restricted stock, restricted stock units, stock appreciation rights and other awards in such amounts and with such terms and conditions as may be determined by a committee of our Board of Directors, subject to the provisions of the plan. We have reserved a total of 1.6 million shares of common stock for issuance under the 2006 Directors Plan. The 2006 Directors Plan provides that awards other than stock options and stock appreciation rights will be counted against the total number of shares reserved under the plan in a 1.5-to-1 ratio. In June 2015 our stockholders approved an amendment to extend the term of the 2006 Directors Plan until June 2025.
Omnibus Plans
In June 2008 our stockholders approved the 2008 Omnibus Plan for share-based awards to our employees. Awards granted from the 2008 Omnibus Plan may include stock options, shares of restricted stock, restricted stock units, performance shares, shares of phantom stock, stock appreciation rights and other awards in such amounts and with such terms and conditions as may be determined by a committee of our Board of Directors, subject to the provisions of the plan. Shares of common stock available for issuance under the 2008 Omnibus Plan consist of 15.0 million shares reserved for this purpose, plus shares of common stock that remained available for issuance under our 2005 Omnibus Equity Plan on the date that our stockholders approved the 2008 Omnibus Plan, plus shares that were subject to awards under the 2005 Omnibus Equity Plan that remain unissued upon the cancellation, surrender, exchange or termination of such awards. The 2008 Omnibus Equity Plan provides that awards other than stock options and stock appreciation rights will be counted against the total number of shares available under the plan in a 1.5-to-1 ratio.
We have not made any awards pursuant to the 2005 Omnibus Equity Plan since our stockholders approved the 2008 Omnibus Plan, and do not intend to make any awards pursuant to the 2005 Omnibus Equity Plan in the future, except that unused shares under the 2005 Omnibus Equity Plan have been carried over for use under the 2008 Omnibus Plan.

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Stock Options
We currently do not grant stock options to our employees or directors. Outstanding stock options previously granted to our employees and directors generally have a ten-year term and vest over a period of between one and four years, provided the individual continues to serve at Biogen through the vesting dates. Options granted under all plans are exercisable at a price per share not less than the fair market value of the underlying common stock on the date of grant. The estimated fair value of options, including the effect of estimated forfeitures, is recognized over the options’ vesting periods. The fair value of the stock options granted in 2010 was estimated as of the date of grant using a Black-Scholes option valuation model. There were no grants of stock options made in 2016, 2015 and 2014. As of December 31, 2016, all outstanding options were exercisable.
The expected life of options granted is derived using assumed exercise rates based on historical exercise patterns and represents the period of time that options granted are expected to be outstanding. Expected stock price volatility is based upon implied volatility for our exchange-traded options and other factors, including historical volatility. After assessing all available information on either historical volatility, implied volatility, or both, we have concluded that a combination of both historical and implied volatility provides the best estimate of expected volatility. The risk-free interest rate used is determined by the market yield curve based upon risk-free interest rates established by the Federal Reserve, or non-coupon bonds that have maturities equal to the expected term. The dividend yield of zero is based upon the fact that we have not historically granted cash dividends, and do not expect to issue dividends in the foreseeable future. Stock options granted prior to January 1, 2006 were valued based on the grant date fair value of those awards, using the Black-Scholes option pricing model, as previously calculated for pro-forma disclosures.
The following table summarizes our stock option activity:
 Shares 
Weighted
Average
Exercise
Price
Outstanding at December 31, 2015107,000
 $53.94
Granted
 $
Exercised(41,000) $53.75
Cancelled
 $
Outstanding at December 31, 201666,000
 $54.06
The total intrinsic values of options exercised in 2016, 2015 and 2014 totaled $10.4 million, $38.0 million and $42.7 million, respectively. The changeaggregate intrinsic values of options outstanding as of December 31, 2016 totaled $15.0 million. The weighted average remaining contractual term for options outstanding as of December 31, 2016 was 2.0 years.
The following table summarizes the amount of tax benefit realized for stock options and cash received from the exercise of stock options:
 For the Years Ended December 31,
(In millions)2016 2015 2014
Tax benefit realized for stock options$4.0
 $11.9
 $13.0
Cash received from the exercise of stock options$2.2
 $6.3
 $8.5
Market Stock Units (MSUs)
MSUs awarded to employees prior to 2014 vested in amortizationfour equal annual increments beginning on the first anniversary of acquired intangiblethe grant date. Participants may ultimately earn between 0% and 150% of the target number of units granted based on actual stock performance.
MSUs awarded to employees in 2014, 2015 and 2016 vest in three equal annual increments beginning on the first anniversary of the grant date, and participants may ultimately earn between 0% and 200% of the target number of units granted based on actual stock performance.

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

The vesting of these awards is subject to the respective employee’s continued employment. The number of MSUs granted represents the target number of units that are eligible to be earned based on the attainment of certain market-based criteria involving our stock price. The number of MSUs earned is calculated at each annual anniversary from the date of grant over the respective vesting periods, resulting in multiple performance periods. Accordingly, additional MSUs may be issued or currently outstanding MSUs may be cancelled upon final determination of the number of awards earned. Compensation expense, including the effect of forfeitures, is recognized over the applicable service period.
The following table summarizes our MSU activity:
 Shares 
Weighted
Average
Grant Date
Fair Value
Unvested at December 31, 2015269,000
 $339.89
Granted (a)168,000
 $328.03
Vested(155,000) $244.68
Forfeited(52,000) $371.62
Unvested at December 31, 2016230,000
 $355.60
(a)
MSUs granted in 2016 include approximately 15,000 and 20,000 MSUs issued in 2016 based upon the attainment of performance criteria set for 2013 and 2012, respectively, in relation to awards granted in those years. The remainder of MSUs granted during 2016 include awards granted in conjunction with our annual awards made in February 2016 and MSUs granted in conjunction with the hiring of employees. These grants reflect the target number of shares eligible to be earned at the time of grant.
We value grants of MSUs using a lattice model with a Monte Carlo simulation. This valuation methodology utilizes several key assumptions, including the 60 calendar day average closing stock price on grant date for MSUs awarded prior to 2014, the 30 calendar day average closing stock price on the date of grant for MSUs awarded in 2014, 2015 and 2016, expected volatility of our stock price, risk-free rates of return and expected dividend yield.
The assumptions used in our valuation are summarized as follows:
 For the Years Ended December 31,
 2016 2015 2014
Expected dividend yield—% —% —%
Range of expected stock price volatility38.2% - 40.7% 31.0% - 33.2% 31.7% - 35.1%
Range of risk-free interest rates0.6% - 0.9% 0.2% - 1.0% 0.1% - 0.7%
30 calendar day average stock price on grant date$260.67 - $304.86 $277.35 - $426.27 $280.88 - $335.65
Weighted-average per share grant date fair value$328.03 $493.43 $395.22
The total fair values of MSUs vested in 2016, 2015 and 2014 totaled $39.3 million, $109.0 million and $117.4 million, respectively.
Cash Settled Performance Units (CSPUs)
CSPUs awarded to employees vest in three equal annual increments beginning on the first anniversary of the grant date. The vesting of these awards is subject to the respective employee’s continued employment with such awards settled in cash. The number of CSPUs granted represents the target number of units that are eligible to be earned based on the attainment of certain performance measures established at the beginning of the performance period, which ends on December 31 of each year. Participants may ultimately earn between 0% and 200% of the target number of units granted based on the degree of actual performance metric achievement. Accordingly, additional CSPUs may be issued or currently outstanding CSPUs may be cancelled upon final determination of the number of units earned. CSPUs awarded prior to 2014 are settled in cash based on the 60 calendar day average closing stock price through each vesting date once the actual vested and earned number of units is known. CSPUs awarded in 2014, 2015 and 2016 will be settled in cash based on the 30 calendar day average closing stock price through each vesting date, once the actual vested and earned number of units is known. Since no shares are issued, these awards do not dilute equity. Compensation expense, including the effect of forfeitures, is recognized over the applicable service period.

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

The following table summarizes our CSPU activity:
Shares
Unvested at December 31, 2015192,000
Granted (a)86,000
Vested(117,000)
Forfeited(39,000)
Unvested at December 31, 2016122,000
(a)CSPUs granted in 2016 include awards granted in conjunction with our annual awards made in February 2016 and CSPUs granted in conjunction with the hiring of employees. These grants reflect the target number of shares eligible to be earned at the time of grant.
The total cash paid in settlement of CSPUs vested in 2016, 2015 and 2014 totaled $31.9 million, $79.8 million and $92.8 million, respectively. 
Performance-vested Restricted Stock Units (PUs)
In 2014 we revised our long term incentive program to include a new type of award granted to certain employees in the form of restricted stock units that may be settled in cash or shares of our common stock at the sole discretion of the Compensation and Management Development Committee of our Board of Directors. These awards are structured and accounted for the same way as the cash settled performance units, and vest in three equal annual increments beginning on the first anniversary of the grant date. The number of PUs granted represents the target number of units that are eligible to be earned based on the attainment of certain performance measures established at the beginning of the performance period, which ends on December 31 of each year. Participants may ultimately earn between 0% and 200% of the target number of units granted based on the degree of actual performance metric achievement. Accordingly, additional PUs may be issued or currently outstanding PUs may be cancelled upon final determination of the number of units earned. PUs settling in cash are based on the 30 calendar day average closing stock price through each vesting date once the actual vested and earned number of units is known. Compensation expense, including the effect of forfeitures, is recognized over the applicable service period.
The following table summarizes our PU activity:
Shares
Unvested at December 31, 2015103,000
Granted (a)55,000
Vested(31,000)
Forfeited(17,000)
Unvested at December 31, 2016110,000
(a)PUs granted in 2016 include awards granted in conjunction with our annual awards made in February 2016 and PUs granted in conjunction with the hiring of employees. These grants reflect the target number of shares eligible to be earned at the time of grant.
During 2015 32,000 PU were converted to share settlements, of which approximately 11,000 shares were vested and issued. All other PUs that vested in 2015 were settled in cash totaling $12.4 million.
All PUs that vested in 2016 were settled in cash totaling $8.1 million.
Time-Vested Restricted Stock Units (RSUs)
RSUs awarded to employees generally vest no sooner than one-third per year over three years on the anniversary of the date of grant, or upon the third anniversary of the date of the grant, provided the employee remains continuously employed with us, except as otherwise provided in the plan. Shares of our common stock will be delivered to the employee upon vesting, subject to payment of applicable withholding taxes. RSUs awarded to directors for service on our Board of Directors vest on the first anniversary of the date of grant, provided in each case that the director continues to serve on our Board of Directors through the vesting date. Shares of our common stock will be delivered to the director upon vesting and are not subject to any withholding taxes. The fair value of all RSUs is based on the market value of our stock on the date of grant. Compensation expense, including the effect of forfeitures, is recognized over the applicable service period.

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

The following table summarizes our RSU activity:
 Shares 
Weighted
Average
Grant Date
Fair Value
Unvested at December 31, 2015810,000
 $323.87
Granted (a)649,000
 $268.52
Vested(406,000) $285.13
Forfeited(165,000) $310.30
Unvested at December 31, 2016888,000
 $303.49
(a)
RSUs granted in 2016 primarily represent RSUs granted in conjunction with our annual awards made in February 2016 and awards made in conjunction with the hiring of new employees. RSUs granted in 2016 also include approximately 11,000 RSUs granted to our Board of Directors.
RSUs granted in 2015 and 2014 had weighted average grant date fair values of $388.88 and $321.72, respectively.
The total fair values of RSUs vested in 2016, 2015 and 2014 totaled $104.6 million, $239.7 million and $281.1 million, respectively. 
Employee Stock Purchase Plan (ESPP)
In June 2015 our stockholders approved the Biogen Inc. 2015 ESPP (2015 ESPP). The 2015 ESPP, which became effective on July 1, 2015, replaced the Biogen Idec Inc. 1995 ESPP (1995 ESPP), which expired on June 30, 2015. The maximum aggregate number of shares of our common stock that may be purchased under the 2015 ESPP is 6.2 million.
The following table summarizes our ESPP activity:
 For the Years Ended December 31,
(In millions, except share amounts)2016 2015 2014
Shares issued under the 2015 ESPP190,000
 78,000
 **
Shares issued under the 1995 ESPP
 98,000
 180,000
Cash received under the 2015 ESPP$41.5
 $19.3
 **
Cash received under the 1995 ESPP$
 $30.0
 $46.4

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

16.      Income Taxes
Income Tax Expense
Income before income tax provision and the income tax expense consist of the following:
 For the Years Ended December 31,
(In millions)2016 2015 2014
Income before income taxes (benefit):     
Domestic$3,655.4
 $3,386.7
 $2,557.4
Foreign1,277.6
 1,380.6
 1,389.2
Total$4,933.0
 $4,767.3
 $3,946.6
Income tax expense (benefit):     
Current:     
Federal$1,304.3
 $1,214.1
 $1,159.5
State55.1
 38.6
 65.2
Foreign52.9
 54.5
 73.4
Total1,412.3
 1,307.2
 1,298.1
Deferred:     
Federal$(125.6) $(129.6) $(280.9)
State(3.8) (1.9) (21.0)
Foreign(45.6) (14.1) (6.3)
Total(175.0) (145.6) (308.2)
Total income tax expense$1,237.3
 $1,161.6
 $989.9
Deferred Tax Assets and Liabilities
Significant components of our deferred tax assets and liabilities are summarized as follows:
 As of December 31,
(In millions)2016 2015
Deferred tax assets:   
Tax credits$201.1
 $189.3
Inventory, other reserves and accruals250.6
 243.9
Intangibles, net459.8
 328.3
Net operating loss65.9
 24.7
Share-based compensation61.5
 63.8
Other49.0
 35.8
Valuation allowance(16.1) (14.1)
Total deferred tax assets$1,071.8
 $871.7
Deferred tax liabilities:   
Purchased intangible assets$(376.6) $(440.1)
Depreciation, amortization and other(113.5) (102.7)
Total deferred tax liabilities$(490.1) $(542.8)
In addition to deferred tax assets and liabilities, we have recorded prepaid tax and deferred charges related to intercompany transactions. As of December 31, 2016 and 2015, the total deferred charges and prepaid taxes were $989.8 million and $697.9 million, respectively.


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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Tax Rate
A reconciliation between the U.S. federal statutory tax rate and our effective tax rate is summarized as follows:
 For the Years Ended December 31,
 2016 2015 2014
Statutory rate35.0 % 35.0 % 35.0 %
State taxes0.9
 0.5
 1.2
Taxes on foreign earnings(9.6) (10.0) (9.5)
Credits and net operating loss utilization(1.4) (1.3) (1.1)
Purchased intangible assets1.2
 1.0
 1.2
Manufacturing deduction(1.9) (1.8) (1.8)
Other permanent items0.5
 0.7
 0.5
Other0.4
 0.3
 (0.4)
Effective tax rate25.1 % 24.4 % 25.1 %
Our effective tax rate for 2016 compared to 2015 increased primarily due to a net state tax benefit in 2015 resulting from the remeasurement of one of our uncertain tax positions, described below, and a higher relative percentage of our earnings being attributed to the U.S., a higher tax jurisdiction.
Our effective tax rate for 2015 compared to 2014 benefited from lower taxes on foreign earnings and reflects a $27.0 million benefit from the 2015 remeasurement of one of our uncertain tax positions.
As of December 31, 2016, we had net operating losses and general business credit carry forwards for federal income tax purposes of approximately $22.5 million and $140.0 million, respectively, which begin to expire in 2020. Additionally, for state income tax purposes, we had net operating loss carry forwards of approximately $86.4 million, which begin to expire in 2017. For state income tax purposes, we also had research and investment credit carry forwards of approximately $126.6 million, which begin to expire in 2017. For foreign income tax purposes, we had $489.4 million of net operating loss carryforwards, which begin to expire in 2021.
In assessing the realizability of our deferred tax assets, we have considered whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. In making this determination, under the applicable financial reporting standards, we are allowed to consider the scheduled reversal of deferred tax liabilities, projected future taxable income and tax planning strategies. Our estimates of future taxable income take into consideration, among other items, our estimates of future income tax deductions related to the exercise of stock options. Based upon the level of historical taxable income and income tax liability and projections for future taxable income over the periods in which the deferred tax assets are utilizable, we believe it is more likely than not that we will realize the net benefits of the deferred tax assets of our wholly owned subsidiaries. In the event that actual results differ from our estimates or we adjust our estimates in future periods, we may need to establish a valuation allowance, which could materially impact our financial position and results of operations.
As of December 31, 2016, undistributed foreign earnings of non-U.S. subsidiaries included in consolidated retained earnings and other basis differences aggregated approximately $7.6 billion. We intend to reinvest these earnings indefinitely in operations outside the U.S. The residual U.S. tax liability, if cumulative amounts were repatriated, would be between $1.8 billion to $2.3 billion as of December 31, 2016.

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Accounting for Uncertainty in Income Taxes
A reconciliation of the beginning and ending amount of our unrecognized tax benefits is summarized as follows:
(In millions)2016 2015 2014
Balance at January 1,$67.9
 $131.5
 $110.1
Additions based on tax positions related to the current period7.2
 10.5
 20.8
Additions for tax positions of prior periods36.3
 19.5
 86.1
Reductions for tax positions of prior periods(13.3) (49.9) (23.4)
Statute expirations(1.4) (1.2) (1.6)
Settlements(64.3) (42.5) (60.5)
Balance at December 31,$32.4
 $67.9
 $131.5
We and our subsidiaries are routinely examined by various taxing authorities. We file income tax returns in the U.S. federal jurisdiction, various U.S. states, and foreign jurisdictions. With few exceptions, including the proposed disallowance we discuss below, we are no longer subject to U.S. federal tax examination for years before 2013 or state, local, or non-U.S. income tax examinations for years before 2005.
Included in the balance of unrecognized tax benefits as of December 31, 2016, 2015 and 2014 are $26.9 million, $15.7 million and $53.6 million (net of the federal benefit on state issues), respectively, of unrecognized tax benefits that, if recognized, would affect the effective income tax rate in future periods.
We recognize potential interest and penalties accrued related to unrecognized tax benefits in income tax expense. In 2016 we recognized a net interest expense of $9.1 million. In 2015 we recognized net interest expense of $3.1 million. In 2014 we recognized a net interest expense of approximately $4.1 million. We have accrued approximately $25.2 million and $12.5 million for the payment of interest as of December 31, 2016 and 2015, respectively.
In March 2015 we received a final assessment from the Danish Tax Authority (SKAT) for fiscal 2009 regarding withholding taxes and the treatment of certain intercompany transactions involving a Danish affiliate and another of our affiliates. In April 2016 we received final assessments from the SKAT for 2011 and 2013 regarding withholding taxes for similar intercompany transactions. The total amount assessed for 2009, 2011 and 2013 is estimated to be $58.3 million, including interest. For the assessments related to 2011 and 2013 we have made payments to SKAT totaling $12.2 million. We continue to dispute the assessments for all of these periods and believe that the positions taken in our historical filings are valid.
Federal Uncertain Tax Positions
During the year ended December 31, 2014 was primarily driven by a$60.2 million increase in amortization2015, the net effect of acquired and in-licensed rights and patents as we recognized a full year of expense related to our TYSABRI rights in 2014 versus nine months of expense in 2013, total impairment charges of $50.9 million relatedadjustments to one of our out-licensed patents and oneuncertain tax positions was a net benefit of approximately $27.0 million, primarily related to the state impact of a federal uncertain tax item.
It is reasonably possible that we will adjust the value of our IPR&D intangibleuncertain tax positions related to our revenues from anti-CD20 therapeutic programs and certain transfer pricing issues as we receive additional information from various taxing authorities, including reaching settlements with the authorities. In addition, the IRS and other national tax authorities routinely examine our intercompany transfer pricing with respect to intellectual property related transactions and it is possible that they may disagree with one or more positions we have taken with respect to such valuations.

F- 49

BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

17.      Other Consolidated Financial Statement Detail
Supplemental Cash Flow Information
Supplemental disclosure of cash flow information for the years ended December 31, 2016, 2015 and 2014, is as follows:
 For the Years Ended December 31,
(In millions)2016 2015 2014
Cash paid during the year for:     
Interest$281.2
 $39.1
 $41.2
Income taxes$1,642.2
 $1,674.8
 $1,163.2
Non-cash Operating, Investing and Financing Activity
In December 2016 we accrued $454.8 million related to the recent settlement and license agreement with Forward Pharma A/S (Forward Pharma). For additional information related to this transaction, please read Note 21, Commitment and Contingencies to these consolidated financial statements.
In the fourth quarter of 2016 we accrued $300.0 million upon reaching $11.0 billion in total cumulative sales of Fumapharm Products. The amount, net of tax benefit, was accounted for as an increase to goodwill in accordance with the accounting standard applicable to business combinations when we acquired Fumapharm and is expected to be paid in the first quarter of 2017. For additional information related to this transaction, please read Note 21, Commitments and Contingencies to these consolidated financial statements.
In connection with the construction of our manufacturing facility in Solothurn, Switzerland, we accrued charges related to processing equipment and engineering services of approximately $100.0 million in our consolidated balance sheet. For additional information related to this transaction, please read Note 10, Property, Plant and Equipment to these consolidated financial statements.
In February 2015 upon completion of our acquisition of Convergence, we recorded a contingent consideration obligation of $274.5 million as part of the purchase price. For additional information related to this transaction, please read Note 2, Acquisitions to these consolidated financial statements.
Other Income (Expense), Net
Components of other income (expense), net, are summarized as follows:
 For the Years Ended December 31,
(In millions)2016 2015 2014
Interest income$63.4
 $22.1
 $12.2
Interest expense(260.0) (95.5) (29.5)
Gain (loss) on investments, net6.0
 (3.8) 11.8
Foreign exchange gains (losses), net(9.8) (32.7) (11.6)
Other, net(17.0) (13.8) (8.7)
Total other income (expense), net$(217.4) $(123.7) $(25.8)
Other Current Assets
Other current assets include prepaid taxes totaling approximately $817.0 million and lower expected lifetime revenues$550.6 million as of AVONEX as discussed further below.December 31, 2016 and 2015, respectively.

F- 50

BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Accrued Expenses and Other
Accrued expenses and other consists of the following:
 As of December 31,
(In millions)2016 2015
Current portion of contingent consideration obligations$580.8
 $504.7
Accrued TECFIDERA litigation settlement and license charges454.8
 
Revenue-related reserves for discounts and allowances438.6
 518.1
Employee compensation and benefits282.9
 270.8
Royalties and licensing fees195.8
 167.9
Construction in progress134.0
 87.9
Collaboration expenses130.9
 31.2
Other685.7
 516.2
Total accrued expenses and other$2,903.5
 $2,096.8
Out-licensed Patents
Out-licensed patents to third-parties primarily relate to patents acquired in connection with the merger of Biogen, Inc. and IDEC Pharmaceuticals Corporation in 2003. During 2014, we recorded a charge of $34.7 million related to the impairment of one of our out-licensed patents to reflect a change in its estimated fair value due to a change in the underlying competitive market for that product, which occurred during the first quarter of 2014.product. The charge iswas included in amortization of acquired intangible assets.assets in our consolidated statements of income. The fair value of the intangible asset was based on a discounted cash flow calculated using Level 3 fair value measurements and inputs including estimated revenues. There were no impairment charges related to our out-licensed patents during 2016 or 2015.
Developed Technology
Developed technology primarily relates to our AVONEX product, which was recorded in connection with the merger of Biogen, Inc. and IDEC Pharmaceuticals Corporation in 2003. The net book value of this asset as of December 31, 2014,2016, was $599.3$363.3 million. We amortize this intangible asset using the economic consumption method based on actual and expected revenues generated from the sales

F- 27

In-process Research and Development (IPR&D)BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

IPR&D
IPR&D represents the fair value assigned to research and development assets that we acquire thatand have not reached technological feasibility at the date of acquisition. Upon commercialization, we will determine the estimated useful life. In connection with our acquisition of Convergence in February 2015, we acquired IPR&D programs with an estimated fair value of $424.6 million. This amount has and will be adjusted for foreign exchange rate fluctuations. For a more detailed description of this transaction, please read Note 2, Acquisitions to these consolidated financial statements.
An analysis of anticipated lifetime revenues and anticipated development costs is performed annually during our long- range planning cycle, which was updated in the third quarter of 2014.2016. This analysis is based upon certain assumptions that we evaluate on a periodic basis, including anticipated future product sales, the expected impact of changes in the amount of development costs and the probabilities of our programs succeeding, the introduction of new products by our competitors and changes in our commercial and pipeline product candidates.  

F- 24

TableDuring the fourth quarter of Contents2016 we terminated our collaboration agreements with Rodin Therapeutics, Inc. and Ataxion Inc., resulting in impairment losses of $8.7 million and $3.5 million, respectively, reflecting the full value of the assets recorded upon entering into the collaboration agreements. These impairment losses are included in amortization of acquired intangible assets in our consolidated statements of income.
BIOGEN IDEC INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


During the third quarter of 2014, we updated the probabilities of success related to the early stage programs acquired through our recent acquisitions. The change in probability of success, combined with a delay in one of the projects, resulted in an impairment loss of $16.2 million in one of our IPR&D assets during 2014. In addition, we have adjusted the value of our contingent consideration liabilities to reflect these lower probabilities of success in connection with these earlier stage programs resulting in a net gain of $49.4 million in the third quarter of 2014. The2014. This impairment charge wasis included in amortization of acquired intangible assets and the gains were recorded in (gain) loss on fair value remeasurementour consolidated statements of contingent consideration. The fair values of the intangible assets and contingent consideration liabilities were based on a probability-adjusted discounted cash flow calculation using Level 3 fair value measurements and inputs including estimated revenues and probabilities of success.income.
Acquired and In-licensed Rights and Patents
Acquired and in-licensed rights and patents primarily relate to our acquisition of all remaining rights to TYSABRI from Elan. The net intangible asset capitalized related to this acquisition was $3,178.3 million. In the second quarter of 2013, we began amortizing this intangible asset over the estimated useful life using an economic consumption method based on actual and expected revenues generated from the sales of our TYSABRI product.Elan Corporation plc (Elan). The net book value of this asset as of December 31, 20142016, was $2,921.0$2,493.2 million. For a more detailed description of this transaction, please read Note 2, Acquisitions to these consolidated financial statements.
The increasenet change in acquired and in-licensed rights and patents during the year ended December 31, 2016, reflects:
$60.0 million2014 milestone payment due to Ionis Pharmaceuticals, Inc. (Ionis) for the approval of SPINRAZA in the U.S. in December 2016;
$50.0 million in total milestone payments due to Samsung Bioepis, which became payable upon the approval of BENEPALI and FLIXABI in the E.U. in January 2016 and May 2016, respectively;
$32.0 million in total milestone payments due to AbbVie, Inc. (AbbVie), was primarily related towhich became payable upon the $20.0approval of ZINBRYTA in the U.S. in May 2016 and the E.U. in July 2016; and
$26.5 million upon the approval of ALPROLIX in the E.U. in May 2016 which is comprised of a $20.0 million contingent payment due to the former owners of Syntonix which became payable upon the approval of ALPROLIX in the U.S. by the U.S. FoodPharmaceuticals, Inc. (Syntonix) and Drug Administration (FDA) in the first quarter of 2014. We have recorded an additional $7.8$6.5 million of acquired in-licensed rights and patents related to this consideration, along withthe establishment of a corresponding deferred tax liability of the same amount.liability.
For additional information on our relationships with Samsung Bioepis, AbbVie and Ionis, please read Note 19, Collaborative and Other Relationships to these consolidated financial statements.
Estimated Future Amortization of Intangible Assets
Our amortization expense is based on the economic consumption of the intangible assets. Our most significant intangible assets are related to our AVONEX and TYSABRI products. Annually, during our long-range planning cycle, we perform an analysis of anticipated lifetime revenues of AVONEX and TYSABRI. This analysis is also updated whenever events or changes in circumstances would significantly affect the anticipated lifetime revenues of either product.

F- 28

BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Our most recent long range planning cycle was updatedcompleted in the third quarter of 2014. Our analysis included an increase in the expected future product revenues of TYSABRI, resulting in a decrease in amortization expense as compared to prior quarters. Our analysis also included a decrease in the expected future product revenues of AVONEX, resulting in an increase in amortization expense as compared to prior quarters. The results of our TYSABRI and AVONEX analyses were impacted by changes in the estimated impact of TECFIDERA, as well as other existing and potential oral and alternative MS formulations, including PLEGRIDY, that may compete with TYSABRI and AVONEX.2016. Based upon this recent analysis, the estimated future amortization forof acquired intangible assets is expected to be as follows:
(In millions)As of December 31, 2014As of December 31, 2016
2015$344.3
2016313.2
2017286.3
$334.8
2018283.7
312.7
2019273.6
295.2
Total$1,501.1
2020259.7
2021242.8

F- 25

BIOGEN IDEC INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


Goodwill
The following table provides a roll forward of the changes in our goodwill balance:
As of December 31,As of December 31,
(In millions)2014 20132016 2015
Goodwill, beginning of year$1,232.9
 $1,201.3
$2,663.8
 $1,760.2
Increase to goodwill527.3
 35.7
1,026.9
 908.1
Other
 (4.1)(21.4) (4.5)
Goodwill, end of year$1,760.2
 $1,232.9
$3,669.3
 $2,663.8
The increase in goodwill during 20142016 was related to $600.0 million$1.2 billion in contingent paymentsmilestones achieved (exclusive of $72.7$173.1 million in tax benefits) madeand payable to the former shareholders of Fumapharm AG or holders of their rights. Other includes changes related to foreign exchange rate fluctuations. The increase in goodwill during 2015 was related to $900.0 million in contingent milestones achieved (exclusive of $120.2 million in tax benefits) and payable to the former shareholders of Fumapharm AG or holders of their rights and $128.3 million related to our acquisition of Convergence.
For additional information related to future contingent payments to the former shareholders of Fumapharm AG or holders of their rights, please read Note 22,21, Commitments and Contingencies to these consolidated financial statements. For additional information related to our acquisition of Convergence, please read Note 2, Acquisitions to these consolidated financial statements.
As of December 31, 2014,2016, we had no accumulated impairment losses related to goodwill.

F- 29

8.    Fair Value Measurements
BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

7.        Fair Value Measurements
The tables below present information about our assets and liabilities that are regularly measured and carried at fair value and indicate the level within the fair value hierarchy of the valuation techniques we utilized to determine such fair value:
(In millions)As of
December 31,
2014
 
Quoted
Prices in
Active
Markets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
As of
December 31,
2016
 
Quoted
Prices in
Active
Markets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Assets:              
Cash equivalents$716.3
 $
 $716.3
 $
$2,039.6
 $
 $2,039.6
 $
Marketable debt securities:              
Corporate debt securities1,063.0
 
 1,063.0
 
2,663.8
 
 2,663.8
 
Government securities849.8
 
 849.8
 
2,172.5
 
 2,172.5
 
Mortgage and other asset backed securities198.3
 
 198.3
 
561.7
 
 561.7
 
Marketable equity securities6.9
 6.9
 
 
24.9
 24.9
 
 
Venture capital investments14.5
 
 
 14.5
Derivative contracts72.7
 
 72.7
 
61.0
 
 61.0
 
Plan assets for deferred compensation36.9
 
 36.9
 
34.5
 
 34.5
 
Total$2,958.4
 $6.9
 $2,937.0
 $14.5
$7,558.0
 $24.9
 $7,533.1
 $
Liabilities:              
Derivative contracts$5.4
 $
 $5.4
 $
$13.6
 $
 $13.6
 $
Contingent consideration obligations215.5
 
 
 215.5
467.6
 
 
 467.6
Total$220.9
 $
 $5.4
 $215.5
$481.2
 $
 $13.6
 $467.6

F- 26

BIOGEN IDEC INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


(In millions)As of
December 31,
2013
 
Quoted
Prices
in Active
Markets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
As of
December 31,
2015
 
Quoted
Prices
in Active
Markets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Assets:              
Cash equivalents$424.7
 $
 $424.7
 $
$909.5
 $
 $909.5
 $
Marketable debt securities:              
Corporate debt securities439.8
 
 439.8
 
1,510.9
 
 1,510.9
 
Government securities674.7
 
 674.7
 
2,875.9
 
 2,875.9
 
Mortgage and other asset backed securities131.4
 
 131.4
 
494.1
 
 494.1
 
Marketable equity securities11.2
 11.2
 
 
37.5
 37.5
 
 
Venture capital investments21.9
 
 
 21.9
Derivative contracts3.8
 
 3.8
 
27.2
 
 27.2
 
Plan assets for deferred compensation22.7
 
 22.7
 
40.1
 
 40.1
 
Total$1,730.2
 $11.2
 $1,697.1
 $21.9
$5,895.2
 $37.5
 $5,857.7
 $
Liabilities:              
Derivative contracts$23.5
 $
 $23.5
 $
$14.7
 $
 $14.7
 $
Contingent consideration obligations280.9
 
 
 280.9
506.0
 
 
 506.0
Total$304.4
 $
 $23.5
 $280.9
$520.7
 $
 $14.7
 $506.0
The fair value of Level 2 instruments classified as cash equivalents and marketable debt securities were determined through third partythird-party pricing services. For a description of our validation procedures related to prices provided by third partythird-party pricing services, refer to Note 1, Summary of Significant Accounting Policies: Fair Value Measurements, to these consolidated financial statements.
Marketable Equity Securities and Venture Capital Investments
Our marketable equity securities represent investments in publicly traded equity securities. Our venture capital investments, which are all Level 3 measurements, include investments in certain venture capital funds, accounted for at fair value, that primarily invest in small privately-owned, venture-backed biotechnology companies. These venture capital investments represented approximately 0.1% and 0.2% of total assets of December 31, 2014 and 2013, respectively.
The following table provides a roll forward of the fair value of our venture capital investments, which includes Level 3 measurements:
 As of December 31,
(In millions)2014 2013
Fair value, beginning of year$21.9
 $20.3
Unrealized gains included in earnings5.4
 10.5
Unrealized losses included in earnings(7.3) (6.3)
Purchases
 0.7
Settlements(5.5) (3.3)
Fair value, end of year$14.5
 $21.9

F- 2730

BIOGEN IDEC INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


Debt Instruments
The fair values of our debt instruments, which are Level 2 liabilities, are summarized as follows:
As of December 31,As of December 31,
(In millions)2014 20132016 2015
Notes payable to Fumedica$12.6
 $17.5
$6.1
 $9.4
6.875% Senior Notes due March 1, 2018634.6
 647.9
583.7
 602.6
2.900% Senior Notes due September 15, 20201,521.5
 1,497.5
3.625% Senior Notes due September 15, 20221,026.6
 1,014.2
4.050% Senior Notes due September 15, 20251,796.0
 1,764.6
5.200% Senior Notes due September 15, 20451,874.5
 1,757.6
Total$647.2
 $665.4
$6,808.4
 $6,645.9
The fair value of our notes payable to Fumedica was estimated using market observable inputs, including current interest and foreign currency exchange rates. The fair valuevalues of each of our 6.875%series of Senior Notes waswere determined through market, observable, and corroborated sources. For additional information related to our debt instruments, please read Note 12,11, Indebtedness to these consolidated financial statements.
Contingent Consideration Obligations
The following table provides a roll forward of the fair values of our contingent consideration obligations which includes Level 3 measurements:
As of December 31,As of December 31,
(In millions)2014 20132016 2015
Fair value, beginning of year$280.9
 $293.9
$506.0
 $215.5
Additions
 

 274.5
Changes in fair value(38.9) (0.5)14.8
 30.5
Payments(26.5) (12.5)
Payments and other(53.2) (14.5)
Fair value, end of year$215.5
 $280.9
$467.6
 $506.0
 As of December 31, 20142016 and 2013,2015, approximately $200.0$246.8 million and $251.9$301.3 million,, respectively, of the fair value of our total contingent consideration obligations werewas reflected as componentsa component of other long-term liabilities withinin our consolidated balance sheets with the remaining balancesbalance reflected as a component of accrued expenses and other. Payments and other for 2016 includes $7.9 million of a Convergence milestone converted to a short-term obligation under the terms of the acquisition agreement.
There were no changes in valuation techniques or transfers between fair value measurement levels during the years ended December 31, 2016 and 2015. The fair values of the intangible assets and contingent consideration liabilities were based on a probability-adjusted discounted cash flow calculation using Level 3 fair value measurements and inputs including estimated revenues and probabilities of success. For additional information related to the changesvaluation techniques and inputs utilized in fair value,valuation of our financial assets and liabilities, please read Note 7,1, Intangible Assets and GoodwillSummary of Significant Accounting Policies to these consolidated financial statements.
Convergence
In connection with our acquisition of Convergence in February 2015 we recorded a contingent consideration obligation of $274.5 million. This valuation was based on probability weighted net cash outflow projections of $450.0 million, discounted using a rate of 2.0%, which was the estimated cost of debt financing for market participants. This liability reflected the revised estimate from the date of acquisition for our initial clinical development plans, resulting probabilities of success and the timing of certain milestone payments. For a more detailed description of this transaction, please read Note 2, Acquisitions to these consolidated financial statements.
As of December 31, 2016 and 2015, the fair value of this contingent consideration obligation was $258.9 million and $297.5 million, respectively. Our most recent valuation was determined based upon probability weighted net cash flow projections of $400.0 million, discounted using a rate of 2.7%, which is a measure of the credit risk associated with settling the liability.

F- 31

BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

For 2016 compared to 2015, the net decrease in the fair value of this obligation was primarily due to achievement of a $50.0 million milestone related to a second indication, partially offset by changes in the discount rate and an increase in the probability of success related to the achievement of certain developmental milestones. Approximately $148.4 million is reflected as a component of accrued expenses and other in our consolidated balance sheets as we expect to make the payment within one year.
Stromedix Inc.
In connection with our acquisition of Stromedix Inc. (Stromedix) in March 2012 we recorded a contingent consideration obligation of $122.2 million.$122.2 million. As of December 31, 20142016 and 2013,2015, the fair value of this contingent consideration obligation was $130.5$133.2 million and $140.7$131.5 million, respectively. Our most recent valuation was determined based upon probability weighted net cash outflow projections of $419.0 million, discounted using a rate of 3.0%2.2%, which is a measure of the credit risk associated with settling the liability.
For 20142016 compared to 2013,2015, the net decrease in the fair value of this obligation was primarily due changes in the probability and expected timing related to the achievement of certain remaining developmental milestones and in the discount rate.
Upon completion of our purchase of the noncontrolling interest in our joint venture investments in Biogen Dompé SRL and Biogen Dompé Switzerland GmbH in September 2011, we recorded a contingent consideration obligation of $38.8 million. As of December 31, 2014 and 2013, the fair value of this contingent consideration obligation was $15.5 million and $31.6 million, respectively. Our most recent valuation was determined based upon probability weighted net cash outflow projections of $22.0 million, discounted using a rate of 2.0%, which is a measure of the credit risk associated with settling the liability. For 2014 compared to 2013, the net decreaseincrease in the fair value of this obligation was primarily due to paymentschanges in the discount rate, partially offset by changes in the expected timing related to the achievement of $16.5certain remaining developmental milestones. Approximately $56.9 million sales-basedis reflected as a component of accrued expenses and regulatory approval milestones.other in our consolidated balance sheets as we expect to make the payment within one year.
Biogen Idec International Neuroscience GmbH
In connection with our acquisition of Biogen Idec International Neuroscience GmbH (BIN), formerly Panima Pharmaceuticals AG (Panima), in December 2010 we recorded a contingent consideration obligation of $81.2 million. As of December 31, 20142016 and 2013,2015, the fair value of this contingent consideration obligation was $69.5$75.5 million and $108.6$77.0 million,, respectively. Our most recent valuation was determined based upon probability weighted net cash outflow projections of $362.5$361.7 million,, discounted using a rate of 3.6%2.7%, which is a measure of the credit risk associated with settling the liability.
For 20142016 compared to 2013,2015, the net decrease in the fair value of this obligation was primarily due to $10.0payment of $3.3 million of payments of developmentin developmental milestones, partially offset by changes in the probabilitydiscount rate. Approximately $15.5 million is reflected as a component of accrued expenses and expected timing relatedother in our consolidated balance sheets as we expect to make the achievement of certain remaining developmental milestones and in the discount rate.payment within one year.

F- 28

BIOGEN IDEC INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


Acquired IPR&D
In connection with our acquisition of Stromedix,Convergence, we also allocated $219.2$424.6 million of the total purchase price to acquired IPR&D, which was capitalized as an intangible asset. The amount allocated to acquired IPR&D was based on significant inputs not observable in the market and thus represented a Level 3 fair value measurement. This estimate was also adjusted from our preliminary estimate as of the date of acquisition to reflect revised estimates to our initial clinical development plans, resulting probabilities of success and the timing of certain milestone payments. These assets arewill be tested for impairment annually and whenever events or changes in circumstances indicate that the carrying value of the assets might not be recoverable, until commercialization, after which time the IPR&D iswill be amortized over its estimated economicuseful life. For a more detailed description of this transaction, please read Note 2, Acquisitions to these consolidated financial statements.
There were no changes in valuation techniques or transfers between fair value measurement levels during the years ended December 31, 2014 and 2013. During the third quarter 2014, we updated the probabilities of success related to the early stage programs acquired through our recent acquisitions. We have adjusted the value of our contingent consideration liabilities to reflect these changes. For additional information, please read Note 7, Intangible Assets and Goodwill to these consolidated financial statements. For additional information related to the valuation techniques and inputs utilized in valuation of
8.    Financial Instruments
The following table summarizes our financial assets with maturities of less than 90 days from the date of purchase included in cash and liabilities, please read Note 1, Summary of Significant Accounting Policies to thesecash equivalents on the accompanying consolidated financial statements.
9.    Financial Instruments
Marketable Securities
The following tables summarize our marketable debt and equity securities:balance sheet:
As of December 31, 2014 (In millions)
Fair
Value
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Amortized
Cost
Available-for-sale:       
Corporate debt securities       
Current$370.4
 $
 $(0.2) $370.6
Non-current692.6
 0.2
 (1.5) 693.9
Government securities       
Current269.9
 
 (0.1) 270.0
Non-current579.9
 0.3
 (0.4) 580.0
Mortgage and other asset backed securities       
Current0.2
 
 
 0.2
Non-current198.1
 0.2
 (0.2) 198.1
Total marketable debt securities$2,111.1
 $0.7
 $(2.4) $2,112.8
Marketable equity securities, non-current$6.9
 $1.2
 $(0.2) $5.9
 As of December 31,
(In millions)2016 2015
Commercial paper$31.0
 $21.9
Overnight reverse repurchase agreements
 134.7
Money market funds741.7
 673.8
Short-term debt securities1,266.9
 79.1
Total$2,039.6
 $909.5

As of December 31, 2013 (In millions)
Fair
Value
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Amortized
Cost
Available-for-sale:       
Corporate debt securities       
Current$100.7
 $
 $
 $100.7
Non-current339.1
 0.4
 (0.1) 338.8
Government securities       
Current519.5
 
 
 519.5
Non-current155.2
 
 (0.1) 155.3
Mortgage and other asset backed securities       
Current
 
 
 
Non-current131.4
 
 (0.1) 131.5
Total marketable debt securities$1,245.9
 $0.4
 $(0.3) $1,245.8
Marketable equity securities, non-current$11.2
 $8.7
 $
 $2.5

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BIOGEN IDEC INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


The following table summarizes our financial assets with maturities of less than 90 days from the date of purchase included within cash and cash equivalents on the accompanying consolidated balance sheet:
 As of December 31,
(In millions)2014 2013
Commercial paper$54.2
 $1.2
Overnight reverse repurchase agreements305.0
 22.4
Money market funds321.2
 396.0
Short-term debt securities35.9
 5.1
Total$716.3
 $424.7
The carrying values of our commercial paper, including accrued interest, overnight reverse repurchase agreements, money market funds and our short-term debt securities approximate fair value due to their short term maturities. Our overnight reverse repurchase agreements were collateralized with agency-guaranteed mortgage-backed securities and represented approximately 0.7% of total assets as of December 31, 2015.
The following tables summarize our marketable debt and equity securities, classified as available for sale:
As of December 31, 2016 (In millions)
Fair
Value
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Amortized
Cost
Corporate debt securities       
Current$1,408.6
 $0.2
 $(0.6) $1,409.0
Non-current1,255.2
 1.2
 (4.7) 1,258.7
Government securities       
Current1,156.0
 0.2
 (0.3) 1,156.1
Non-current1,016.5
 0.5
 (3.4) 1,019.4
Mortgage and other asset backed securities       
Current4.0
 
 
 4.0
Non-current557.7
 0.8
 (2.2) 559.1
Total marketable debt securities$5,398.0
 $2.9
 $(11.2) $5,406.3
Marketable equity securities, non-current$24.9
 $0.7
 $(9.3) $33.5
As of December 31, 2015 (In millions)
Fair
Value
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Amortized
Cost
Corporate debt securities       
Current$394.3
 $
 $(0.5) $394.8
Non-current1,116.6
 0.1
 (4.1) 1,120.6
Government securities       
Current1,723.4
 0.1
 (1.1) 1,724.4
Non-current1,152.5
 
 (3.1) 1,155.6
Mortgage and other asset backed securities       
Current2.8
 
 
 2.8
Non-current491.3
 0.1
 (1.8) 493.0
Total marketable debt securities$4,880.9
 $0.3
 $(10.6) $4,891.2
Marketable equity securities, non-current$37.5
 $9.2
 $
 $28.3
Summary of Contractual Maturities: Available-for-Sale Securities
The estimated fair value and amortized cost of our marketable debt securities available-for-sale by contractual maturity are summarized as follows:
As of December 31, 2014 As of December 31, 2013As of December 31, 2016 As of December 31, 2015
(In millions)
Estimated
Fair  Value
 
Amortized
Cost
 
Estimated
Fair  Value
 
Amortized
Cost
Estimated
Fair  Value
 
Amortized
Cost
 
Estimated
Fair  Value
 
Amortized
Cost
Due in one year or less$640.5
 $640.8
 $620.2
 $620.2
$2,568.6
 $2,569.1
 $2,120.5
 $2,122.0
Due after one year through five years1,343.7
 1,345.2
 573.1
 572.9
2,552.6
 2,559.7
 2,575.9
 2,583.9
Due after five years126.9
 126.8
 52.6
 52.7
276.8
 277.5
 184.5
 185.3
Total available-for-sale securities$2,111.1
 $2,112.8
 $1,245.9
 $1,245.8
$5,398.0
 $5,406.3
 $4,880.9
 $4,891.2
The average maturity of our marketable debt securities available-for-sale as of December 31, 20142016 and 2013,2015 was 1512 months and 1316 months, respectively.

F- 33

BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Proceeds from Marketable Debt Securities
The proceeds from maturities and sales of marketable debt securities and resulting realized gains and losses are summarized as follows:
For the Years Ended December 31,For the Years Ended December 31,
(In millions)2014 2013 20122016 2015 2014
Proceeds from maturities and sales$2,718.9
 $5,190.1
 $2,749.6
$7,378.9
 $4,063.0
 $2,718.9
Realized gains$0.7
 $6.6
 $2.1
$3.3
 $1.5
 $0.7
Realized losses$0.5
 $2.1
 $3.5
$4.3
 $3.5
 $0.5
Realized losses for the year ended December 31, 2016, primarily relate to sales of corporate bonds, agency mortgage-backed securities and other asset-backed securities. Realized losses for the year ended December 31, 2015, primarily relate to sales of corporate bonds, agency mortgage-backed securities and other asset-backed securities. Realized losses for the year ended December 31, 2014,, primarily relate to sales of agency mortgage-backed securities and government securities. Realized losses for the year ended December 31, 2013, primarily relate to sales of agency mortgage-backed securities and corporate securities. Realized losses for the year ended December 31, 2012, primarily relate to sales of agency mortgage-backed securities.
Strategic Investments
As of December 31, 20142016 and 2013,2015, our strategic investment portfolio was comprised of investments totaling $47.8$99.9 million and $56.9$96.0 million, respectively, which are included in investments and other assets in our accompanying consolidated balance sheets.
Our strategic investment portfolio includes investments in marketable equity securities of certain biotechnology companies and our investments in venture capital funds accounted for at fair value which totaled $21.4 million and $33.1 million aswhere the underlying investments are in equity securities of December 31, 2014 and 2013, respectively. Our strategic investment portfolio also includes other equity investments in privately-held companies and additional investments in venture capital funds accounted for under the cost method. The carrying value of these investments totaled $26.4 million and $23.8 million, as of December 31, 2014 and 2013, respectively.biotechnology companies.

F- 30

BIOGEN IDEC INC. AND SUBSIDIARIES9.    Derivative Instruments
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


10.Derivative Instruments
Foreign Currency Forward Contracts - Hedging Instruments
Due to the global nature of our operations, portions of our revenues and operating expenses are earnedrecorded in currencies other than the U.S. dollar. The value of revenues and operating expenses measured in U.S. dollars is therefore subject to changes in foreign currency exchange rates. In order to mitigate these changes we use foreign currency forward contracts to lock in exchange rates associated with a portion of our forecasted international revenues.revenues and operating expenses.
Foreign currency forward contracts in effect as of December 31, 20142016 and 2013,2015, had durations of1 to 15 months and 1 to 18 months, respectively. These contracts have been designated as cash flow hedges and accordingly, to the extent effective, any unrealized gains or losses on these foreign currency forward contracts are reported in accumulated other comprehensive income (loss) (referred to as AOCI in the tables below). Realized gains and losses for the effective portion of such contracts are recognized in revenue when the sale of product in the currency being hedged is recognized.recognized and, beginning in the fourth quarter of 2015, in operating expenses when the expense in the currency being hedged is recorded. To the extent ineffective, hedge transaction gains and losses are reported in other income (expense), net.
The notional value of foreign currency forward contracts that were entered into to hedge forecasted revenues and operating expenses is summarized as follows:
Notional Amount
As of December 31,
Notional Amount
As of December 31,
Foreign Currency: (In millions)2014 20132016 2015
Euro$1,174.6
 $636.3
$871.7
 $945.5
Swiss francs
 80.8
Canadian dollar56.7
 34.0

 76.7
British pound sterling34.5
 72.3
Australian dollar19.9
 
Japanese yen16.6
 
Total foreign currency forward contracts$1,302.3
 $742.6
$871.7
 $1,103.0

F- 34

BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

The portion of the fair value of these foreign currency forward contracts that was included in accumulated other comprehensive income (loss) withinin total equity reflected net gains of $72.1$49.8 million, $1.8 million and losses of $23.6$72.1 million and $11.8 million for the years ended December 31, 2014, 20132016, 2015 and 2012,2014, respectively. We expect all contracts to be settled over the next 1518 months and any amounts in accumulated other comprehensive income (loss) to be reported as an adjustment to revenue.revenue or operating expense. We consider the impact of our and our counterparties’ credit risk on the fair value of the contracts as well as the ability of each party to execute its contractual obligations. As of December 31, 20142016 and 2013,2015, credit risk did not change the fair value of our foreign currency forward contracts.
The following table summarizes the effect of derivativesforeign currency forward contracts designated as hedging instruments on our consolidated statements of income:
For the Years Ended December 31,
Net Gains/(Losses)
Reclassified from AOCI into Net Income
(Effective Portion)
Net Gains/(Losses)
Reclassified from AOCI into Net Income
(Effective Portion)
 
Net Gains/(Losses)
Recognized into Net Income
(Ineffective Portion)
Net Gains/(Losses)
Reclassified from AOCI into Net Income
(Effective Portion)
 
Net Gains/(Losses)
Recognized into Net Income
(Ineffective Portion)
Location 2014 2013 2012 Location 2014 2013 2012 2016 2015 2014 Location 2016 2015 2014
Revenue $6.8
 $(13.2) $35.1
 Other income (expense) $(1.5) $(0.2) $4.8
 $5.3
 $173.2
 $6.8
 Other income (expense) $2.9
 $4.9
 $(1.5)
Operating expenses $(1.5) $
 $
 Other income (expense) $0.1
 $
 $
Interest Rate Contracts - Hedging Instruments
We have entered into interest rate lock contracts or interest rate swap contracts on certain borrowing transactions to manage our exposure to interest rate changes and to reduce our overall cost of borrowing.
Interest Rate Lock Contracts
During 2015 we entered into treasury rate locks, with an aggregated notional amount of $1.1 billion, which were designated as cash flow hedges to hedge against changes in the 10-year and 30-year U.S. treasury interest rates that could have impacted our anticipated debt offering. In connection with the issuance of our 4.05% and 5.20% Senior Notes, as described in Note 11, Indebtedness, we settled the treasury rate locks and realized an $8.5 million gain. As the hedging relationship was effective, the gain was recorded in AOCI and will be recognized in other income (expense), net over the life of the 4.05% and 5.20% Senior Notes.
Interest Rate Swap Contracts
In connection with the issuance of our 2.90% Senior Notes, as described in Note 11, Indebtedness, we entered into interest rate swaps with an aggregate notional amount of $675.0 million, which expire on September 15, 2020. The interest rate swap contracts are designated as hedges of the fair value changes in the 2.90% Senior Notes attributable to changes in interest rates. Since the specific terms and notional amount of the swaps match the debt being hedged, it is assumed to be a highly effective hedge and all changes in the fair value of the swaps are recorded as a component of the 2.90% Senior Notes with no net impact recorded in income. Any net interest payments made or received on the interest rate swap contracts are recognized as a component of interest expense in our consolidated statements of income.
Foreign Currency Forward Contracts - Other Derivatives
We also enter into other foreign currency forward contracts, usually with durations of one month durations,or less, to mitigate the foreign currency risk related to certain balance sheet positions. We have not elected hedge accounting for these transactions.
The aggregate notional amount of these outstanding foreign currency contracts was $365.2$902.1 million and $273.3$721.0 million as of December 31, 20142016 and 2013,2015, respectively. Net losses of $15.5$29.2 million, $23.8 million and net gains of $5.2 million and $4.2$15.5 million related to these contracts were recognized as a component of other income (expense), net, for the years ended December 31, 2014, 20132016, 2015 and 2012,2014, respectively.

F- 31

BIOGEN IDEC INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


Summary of Derivatives
While certain of our derivatives are subject to netting arrangements with our counterparties, we do not offset derivative assets and liabilities withinin our consolidated balance sheets.

F- 35

BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

The following table summarizes the fair value and presentation in our consolidated balance sheets forof our outstanding derivatives including those designated as hedging instruments:
(In millions)Balance Sheet LocationFair Value
As of December 31, 2014
Balance Sheet LocationFair Value
As of December 31, 2016
Hedging Instruments:    
Asset derivativesOther current assets$69.5
Other current assets$50.4
Investments and other assets$1.9
Investments and other assets$6.6
Liability derivativesAccrued expenses and other$
Other long-term liabilities$4.6
Other long-term liabilities$
Other Derivatives:    
Asset derivativesOther current assets$1.3
Other current assets$4.0
Liability derivativesAccrued expenses and other$5.4
Accrued expenses and other$9.0
(In millions)Balance Sheet LocationFair Value
As of December 31, 2013
Balance Sheet LocationFair Value
As of December 31, 2015
Hedging Instruments:    
Asset derivativesOther current assets$0.6
Other current assets$16.6
Investments and other assets$0.3
Liability derivativesAccrued expenses and other$23.4
Accrued expenses and other$10.2
Other long-term liabilities$2.5
Other Derivatives:    
Asset derivativesOther current assets$3.2
Other current assets$10.3
Liability derivativesAccrued expenses and other$0.1
Accrued expenses and other$2.0
11.  Property, Plant and Equipment
10.      Property, Plant and Equipment
Property, plant and equipment are recorded at historical cost, net of accumulated depreciation. Components of property, plant and equipment, net are summarized as follows:
As of December 31,As of December 31,
(In millions)2014 20132016 2015
Land$56.9
 $59.7
$137.8
 $74.7
Buildings947.7
 961.5
1,107.8
 1,035.6
Leasehold improvements155.5
 139.6
123.7
 166.6
Machinery and equipment1,011.3
 944.5
1,105.8
 1,079.6
Computer software and hardware547.8
 559.2
746.8
 647.1
Furniture and fixtures64.3
 60.3
60.6
 72.9
Construction in progress168.6
 144.2
658.6
 441.2
Total cost2,952.1
 2,869.0
3,941.1
 3,517.7
Less: accumulated depreciation(1,186.4) (1,118.3)(1,439.3) (1,330.1)
Total property, plant and equipment, net$1,765.7
 $1,750.7
$2,501.8
 $2,187.6
Depreciation expense totaled $198.4$309.3 million,, $187.8 $217.9 million and $164.3$198.4 million for 2014, 20132016, 2015 and 2012,2014, respectively.
For 2014, 20132016, 2015 and 2012,2014, we capitalized interest costs related to construction in progress totaling approximately $6.4$12.9 million,, $7.8 $10.4 million and $25.4$6.4 million,, respectively.
Solothurn, Switzerland Facility
During the first quarter of 2016 we closed on the purchase of land in Solothurn, Switzerland for 64.4 million Swiss Francs (approximately $62.5 million). We are building a biologics manufacturing facility on this land in the Commune of Luterbach over the next several years. As of December 31, 2016 and 2015, we had approximately $481.5 million and $99.0 million, respectively, capitalized as construction in progress related to the construction of this facility.

F- 3236

BIOGEN IDEC INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


Weston Exit CostsResearch Triangle Park Facility Purchase
As a resultOn August 24, 2015, we purchased from Eisai, Inc. (Eisai) its drug product manufacturing facility and supporting infrastructure in Research Triangle Park (RTP), North Carolina for $104.8 million. The purchase price consisted of $58.6 million for buildings, $25.9 million for machinery and equipment and $20.3 million for land.
On August 24, 2015, we also amended our decisionexisting 10-year lease related to relocate our corporate headquarters to Cambridge, Massachusetts, we vacated part of our Weston, MassachusettsEisai's oral solid dose products manufacturing facility in RTP, North Carolina where we manufacture our and Eisai's oral solid dose products. As amended, the fourthlease provides for a three-year term and our agreement to purchase the facility upon expiration of the lease term and Eisai's completion of certain activities. Accordingly, we recorded the assets along with a corresponding financing obligation on our consolidated balance sheet for $20.3 million, the net present value of the future minimum lease payments. The assets were recorded as a component of buildings and machinery and equipment. We expect to complete the purchase of the oral solid products manufacturing facility at the end of the lease term in the third quarter of 2013. We incurred a charge of $27.2 million in connection with this move. This charge represented our remaining lease obligation for the vacated portion of our Weston, Massachusetts facility, net of sublease income expected to be received. The term of our sublease to the vacated portion of our Weston, Massachusetts facility started in January 2014 and will continue through the remaining term of our lease agreement.2018.
12. Indebtedness
11.     Indebtedness
Our indebtedness is summarized as follows:
 As of December 31,
(In millions)2014 2013
Current portion:   
Note payable to Fumedica$3.1
 $3.5
Current portion of notes payable$3.1
 $3.5
Non-current portion:   
6.875% Senior notes due March 1, 2018573.5
 580.1
Note payable to Fumedica8.6
 12.3
Non-current portion of notes payable$582.1
 $592.4
 As of December 31,
(In millions)2016 2015
Current portion:   
Notes payable to Fumedica$3.0
 $3.1
Financing arrangement for the purchase of the RTP facility1.7
 1.7
Current portion of notes payable and other financing arrangements$4.7
 $4.8
Non-current portion:   
6.875% Senior Notes due March 1, 2018$558.5
 $565.3
2.900% Senior Notes due September 15, 20201,485.3
 1,485.5
3.625% Senior Notes due September 15, 2022993.2
 992.2
4.050% Senior Notes due September 15, 20251,734.8
 1,733.4
5.200% Senior Notes due September 15, 20451,721.5
 1,721.1
Notes payable to Fumedica3.0
 5.9
Financing arrangement for the purchase of the RTP facility16.4
 18.1
Non-current portion of notes payable and other financing arrangements$6,512.7
 $6,521.5
The following is a summary description of our principal indebtedness as of December 31, 2014:2016:
Senior Notes
On March 4, 2008, we issued $550.0 million aggregate principal amount of 6.875% Senior Notes due March 1, 2018, that were originally pricedvalued at 99.184% of par;
$1.5 billion aggregate principal amount of 2.90% Senior Notes due September 15, 2020, valued at 99.792% of par;
$1.0 billion aggregate principal amount of 3.625% Senior Notes due September 15, 2022, valued at 99.920% of par;
$1.75 billion aggregate principal amount of 4.05% Senior Notes due September 15, 2025, valued at 99.764% of par; and
$1.75 billion aggregate principal amount of 5.20% Senior Notes due September 15, 2045, valued at 99.294% of par.
The discount iscosts associated with these offerings of approximately $52.0 million have been recorded as a reduction to the carrying amount of the debt on our consolidated balance sheet. These costs along with the discounts will be amortized as additional interest expense using the effective interest rate method over the period from issuance through maturity.
These notes are senior unsecured obligations. Interest on the notes is payable March 1 and September 1 of each year. The notes may be redeemed at our option at any time at 100% of the principal amount plus accrued interest and a specified make-whole amount. The notes6.875% Senior Notes due in

F- 37

BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

2018 contain a change of control provision that may require us to purchase the notes under certain circumstances. There is also an interest rate adjustment feature that requires us to pay interest at an increased rate on the notes if the credit rating on the notes declines below investment grade.
Upon The remaining Senior Notes contain a change of control provision that may require us to purchase the issuancenotes at a price equal to 101% of the principal amount plus accrued and unpaid interest to the date of purchase under certain circumstances.
In connection with the 2.90% Senior Notes offering due in 2020, we entered into interest rate swap contracts. The carrying value of the 2.90% Senior Notes includes approximately $4.6 million related to changes in the fair value of these contracts. For additional information, please read Note 9, 6.875%Derivative Instruments, to these consolidated financial statements.
In connection with the 6.875% Senior Notes due in 2018, we entered into interest rate swap contracts where we received a fixed rate and paid a variable rate. These contracts were terminated in December 2008. Upon termination of these swaps, the carrying amount of the 6.875% Senior Notes due in 2018 was increased by $62.8$62.8 million and is being amortized using the effective interest rate method over the remaining life of the Senior Notes and is being recognized as a reduction of interest expense. As of December 31, 2014, $25.32016, $9.9 million remains to be amortized.
Notes Payable to Fumedica
In connection with our 2006 distribution agreement with Fumedica, we issued notes totaling 61.4 million Swiss Francs which were payable to Fumedica in varying amounts from June 2008 through June 2018. Our remaining note payable to Fumedica had a carrying value of 11.66.2 million Swiss Francs ($11.7($6.0 million) and 8.9 million) and 14.0 million Swiss Francs ($15.8 million)($9.0 million) as of December 31, 20142016 and 2013,2015, respectively.
Credit Facility
In March 2013,August 2015 we entered into a $750.0 million$1.0 billion, five-year senior unsecured revolving credit facility under which we wereare permitted to draw funds for working capital and general corporate purposes. The terms of the revolving credit facility includedinclude a financial covenant that requiredrequires us not to not exceed a maximum debtconsolidated leverage ratio. As of December 31, 2016, we had no outstanding borrowings and were in compliance with all covenants under this facility.
Financing Arrangement
During 2015 we recorded a financing obligation in relation to EBITDA ratio. In March 2014, the revolving creditamendment of our lease agreement of Eisai's oral solid dose products manufacturing facility expiredin RTP, North Carolina where we manufacture our and was not renewed.

F- 33

TableEisai's oral solid dose products. As of ContentsDecember 31, 2016 and 2015, the financing obligation totaled approximately $18.1 million and $19.8 million, respectively. For additional information, please read Note 10, Property, Plant and Equipment to these consolidated financial statements.
BIOGEN IDEC INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


Debt Maturity
The total gross payments, excluding our financing arrangement, due under our debt arrangements are as follows:
(In millions)As of December 31, 2014As of December 31, 2016
2015$3.1
20163.2
20173.2
$3.1
2018553.2
553.1
2019

2020 and thereafter
20201,500.0
2021
2022 and thereafter4,500.0
Total$562.7
$6,556.2
The fair value of our debt is disclosed in Note 8,7, Fair Value Measurements to these consolidated financial statements.

F- 38

13. Equity
BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

12.      Equity
Preferred Stock
We have 8,000,0008.0 million shares of Preferred Stock authorized, of which 1,750,0001.75 million shares are authorized as Series A, 1,000,0001.0 million shares are authorized as Series X junior participating and 5,250,0005.25 million shares are undesignated. Shares may be issued without a vote or action of stockholders from time to time in classes or series with the designations, powers, preferences, and the relative, participating, optional or other special rights of the shares of each such class or series and any qualifications, limitations or restrictions thereon as set forth in the instruments governing such shares. Any such Preferred Stock may rank prior to common stock as to dividend rights, liquidation preference or both, and may have full or limited voting rights and may be convertible into shares of common stock. We did not have anyNo shares of Preferred Stock were issued and outstanding during 2014, 20132016, 2015 and 2012.2014.
Common Stock
The following table describes the number of shares authorized, issued and outstanding of our common stock as of December 31, 20142016 and 2013:2015:
As of December 31, 2014 As of December 31, 2013As of December 31, 2016 As of December 31, 2015
(In thousands)Authorized Issued Outstanding Authorized Issued Outstanding
(In millions)Authorized Issued Outstanding Authorized Issued Outstanding
Common stock1,000,000
 257,126
 234,563
 1,000,000
 255,973
 236,332
1,000.0
 238.5
 215.9
 1,000.0
 241.2
 218.6
Share Repurchases
In July 2016 our Board of Directors authorized a program to repurchase up to $5.0 billion of our common stock (2016 Share Repurchase Program). This authorization does not have an expiration date. Repurchased shares will be retired. As of December 31, 2016, we repurchased and retired 3.3 million shares of common stock at a cost of $1.0 billion under our 2016 Share Repurchase Program.
In May 2015 our Board of Directors authorized a program to repurchase up to $5.0 billion of our common stock (2015 Share Repurchase Program), which was completed as of December 31, 2015. As of December 31, 2015, we repurchased and retired approximately 16.8 million shares of common stock at a cost of $5.0 billion under our 2015 Share Repurchase Program.
In February 2011 our Board of Directors authorized thea program to repurchase of up to 20.0 million shares of our common stock. This authorizationstock (2011 Share Repurchase Program), which has been used principally to offset common stock issuances under our share-based compensation plans. The 2011 Share Repurchase Program does not have an expiration date. In We did not repurchase any shares of common stock under our 2011 Share Repurchase Program during the years ended December 31, 2016 and 2015. During 2014, we purchased approximately 2.9 million shares were repurchasedof common stock at a cost of $886.8$886.8 million. As of December 31, 2014, under our 2011 Share Repurchase Program. We have approximately 1.3 million shares of our common stock remainedremaining available for repurchase under the 2011this authorization.
We repurchased approximately 2.0 million shares at a cost of approximately $400.3 million under the 2011 authorization in 2013.

F- 34

BIOGEN IDEC INC. AND SUBSIDIARIES13.      Accumulated Other Comprehensive Income (Loss)
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


14.  Accumulated Other Comprehensive Income (Loss)
The following table summarizes the changes in accumulated other comprehensive income (loss), net of tax by component:
(In millions)Unrealized Gains (Losses) on Securities Available for Sale Unrealized Gains (Losses) on Foreign Currency Forward Contracts Unfunded Status of Postretirement Benefit Plans Translation Adjustments TotalUnrealized Gains (Losses) on Securities Available for Sale Unrealized Gains (Losses) on Cash Flow Hedges Unfunded Status of Postretirement Benefit Plans Translation Adjustments Total
Balance, December 31, 2013$5.6
 $(23.7) $(19.6) $10.0
 $(27.7)
Balance, December 31, 2015$(0.8) $10.2
 $(37.8) $(195.6) $(224.0)
Other comprehensive income (loss) before reclassifications0.4
 101.7
 (12.0) (109.2) (19.1)(10.6) 51.6
 5.1
 (138.6) (92.5)
Amounts reclassified from accumulated other comprehensive income (loss)(6.4) (6.3) 
 
 (12.7)0.6
 (4.0) 
 
 (3.4)
Net current period other comprehensive income (loss)(6.0) 95.4
 (12.0) (109.2) (31.7)(10.0) 47.6
 5.1
 (138.6) (95.9)
Balance, December 31, 2014$(0.4) $71.7
 $(31.6) $(99.2) $(59.5)
Balance, December 31, 2016$(10.8) $57.8
 $(32.7) $(334.2) $(319.9)

(In millions)Unrealized Gains (Losses) on Securities Available for Sale Unrealized Gains (Losses) on Foreign Currency Forward Contracts Unfunded Status of Postretirement Benefit Plans Translation Adjustments Total
Balance, December 31, 2012$4.2
 $(10.7) $(21.7) $(27.1) $(55.3)
Other comprehensive income (loss) before reclassifications11.8
 (26.7) 2.1
 37.1
 24.3
Amounts reclassified from accumulated other comprehensive income (loss)(10.4) 13.7
 
 
 3.3
Net current period other comprehensive income (loss)1.4
 (13.0) 2.1
 37.1
 27.6
Balance, December 31, 2013$5.6
 $(23.7) $(19.6) $10.0
 $(27.7)
(In millions)Unrealized Gains (Losses) on Securities Available for Sale Unrealized Gains (Losses) on Foreign Currency Forward Contracts Unfunded Status of Postretirement Benefit Plans Translation Adjustments Total
Balance, December 31, 2011$
 $32.8
 $(9.0) $(50.3) $(26.5)
Other comprehensive income (loss) before reclassifications5.1
 (11.8) (12.7) 23.2
 3.8
Amounts reclassified from accumulated other comprehensive income (loss)(0.9) (31.7) 
 
 (32.6)
Net current period other comprehensive income (loss)4.2
 (43.5) (12.7) 23.2
 (28.7)
Balance, December 31, 2012$4.2
 $(10.7) $(21.7) $(27.1) $(55.3)

F- 3539

BIOGEN IDEC INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


(In millions)Unrealized Gains (Losses) on Securities Available for Sale Unrealized Gains (Losses) on Cash Flow Hedges Unfunded Status of Postretirement Benefit Plans Translation Adjustments Total
Balance, December 31, 2014$(0.4) $71.7
 $(31.6) $(99.2) $(59.5)
Other comprehensive income (loss) before reclassifications(1.7) 110.8
 (6.2) (96.4) 6.5
Amounts reclassified from accumulated other comprehensive income (loss)1.3
 (172.3) 
 
 (171.0)
Net current period other comprehensive income (loss)(0.4) (61.5) (6.2) (96.4) (164.5)
Balance, December 31, 2015$(0.8) $10.2
 $(37.8) $(195.6) $(224.0)
(In millions)Unrealized Gains (Losses) on Securities Available for Sale Unrealized Gains (Losses) on Cash Flow Hedges Unfunded Status of Postretirement Benefit Plans Translation Adjustments Total
Balance, December 31, 2013$5.6
 $(23.7) $(19.6) $10.0
 $(27.7)
Other comprehensive income (loss) before reclassifications0.4
 101.7
 (12.0) (109.2) (19.1)
Amounts reclassified from accumulated other comprehensive income (loss)(6.4) (6.3) 
 
 (12.7)
Net current period other comprehensive income (loss)(6.0) 95.4
 (12.0) (109.2) (31.8)
Balance, December 31, 2014$(0.4) $71.7
 $(31.6) $(99.2) $(59.5)
The following table summarizes the amounts reclassified from accumulated other comprehensive income:
(In millions)Income Statement Location
Amounts Reclassified from
Accumulated Other Comprehensive Income
Income Statement Location
Amounts Reclassified from
Accumulated Other Comprehensive Income
For the Years Ended December 31,
2014 2013 20122016 2015 2014
Gains (losses) on securities available for saleOther income (expense)$9.9
 $15.9
 $1.4
Other income (expense)$(0.9) $(2.0) $9.9
Income tax benefit (expense)(3.5) (5.5) (0.5)Income tax benefit (expense)0.3
 0.7
 (3.5)
            
Gains (losses) on foreign currency forward contractsRevenues6.8
 (13.2) 35.1
Gains (losses) on cash flow hedgesRevenues5.3
 173.2
 6.8
Operating expenses(1.5) 
 
Other income (expense)0.2
 (0.1) 
Income tax benefit (expense)(0.5) (0.5) (3.4)Income tax benefit (expense)
 (0.8) (0.5)
            
Total reclassifications, net of tax $12.7
 $(3.3) $32.6
 $3.4
 $171.0
 $12.7

F- 40

15.  Earnings per Share
BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

14.      Earnings per Share
Basic and diluted earnings per share are calculated as follows:
For the Years Ended December 31,For the Years Ended December 31,
(In millions)2014 2013 20122016 2015 2014
Numerator:          
Net income attributable to Biogen Idec Inc.$2,934.8
 $1,862.3
 $1,380.0
Net income attributable to Biogen Inc.$3,702.8
 $3,547.0
 $2,934.8
Denominator:          
Weighted average number of common shares outstanding236.4
 236.9
 237.9
218.4
 230.7
 236.4
Effect of dilutive securities:          
Stock options and employee stock purchase plan0.1
 0.3
 0.5
0.1
 0.1
 0.1
Time-vested restricted stock units0.5
 0.8
 1.0
0.2
 0.3
 0.5
Market stock units0.2
 0.3
 0.3
0.1
 0.1
 0.2
Dilutive potential common shares0.8
 1.4
 1.8
0.4
 0.5
 0.8
Shares used in calculating diluted earnings per share237.2
 238.3
 239.7
218.8
 231.2
 237.2
Amounts excluded from the calculation of net income per diluted share because their effects were anti-dilutive were insignificant.
Earnings per share for the years ended December 31, 2014, 20132016, 2015 and 2012,2014, reflects, on a weighted average basis, the repurchase of 1.00.7 million shares, 0.94.6 million shares and 5.81.0 million shares, respectively, of our common stock under our share repurchase authorizations.

F- 36

BIOGEN IDEC INC. AND SUBSIDIARIES15.     Share-based Payments
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


16. Share-based Payments
Share-based Compensation Expense
The following table summarizes share-based compensation expense included withinin our consolidated statements of income:
For the Years Ended December 31,For the Years Ended December 31,
(In millions)2014 2013 20122016 2015 2014
Research and development$102.1
 $95.6
 $74.7
$84.5
 $88.6
 $102.1
Selling, general and administrative150.3
 160.3
 109.6
121.7
 127.3
 150.3
Restructuring charges(1.8) (8.6) 
Subtotal252.4
 255.9
 184.3
204.4
 207.3
 252.4
Capitalized share-based compensation costs(10.0) (9.8) (5.4)(14.6) (11.0) (10.0)
Share-based compensation expense included in total cost and expenses242.4
 246.1
 178.9
189.8
 196.3
 242.4
Income tax effect(72.2) (73.3) (53.4)(54.0) (55.8) (72.2)
Share-based compensation expense included in net income attributable to Biogen Idec Inc.$170.2
 $172.8
 $125.5
Share-based compensation expense included in net income attributable to Biogen Inc.$135.8
 $140.5
 $170.2

F- 41

BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

The following table summarizes share-based compensation expense associated with each of our share-based compensation programs:
For the Years Ended December 31,For the Years Ended December 31,
(In millions)2014 2013 20122016 2015 2014
Stock options$
 $0.6
 $2.3
Market stock units37.4
 32.8
 23.3
$38.4
 $38.1
 $37.4
Time-vested restricted stock units115.4
 103.5
 93.0
120.0
 119.0
 115.4
Performance-vested restricted stock units settled in shares
 
 0.1
Cash settled performance units65.5
 109.8
 60.4
16.3
 22.4
 65.5
Performance units21.9
 
 
18.6
 13.9
 21.9
Employee stock purchase plan12.2
 9.2
 5.2
11.1
 13.9
 12.2
Subtotal252.4
 255.9
 184.3
204.4
 207.3
 252.4
Capitalized share-based compensation costs(10.0) (9.8) (5.4)(14.6) (11.0) (10.0)
Share-based compensation expense included in total cost and expenses$242.4
 $246.1
 $178.9
$189.8
 $196.3
 $242.4
Windfall tax benefits from vesting of stock awards, exercises of stock options and ESPP participation were $96.4$12.6 million,, $73.5 $78.2 million and $54.7$96.4 million in 2014, 20132016, 2015 and 2012,2014, respectively. These amounts have been calculated under the alternative transition method.
As of December 31, 2014,2016, unrecognized compensation cost related to unvested share-based compensation was approximately $198.5$189.8 million,, net of estimated forfeitures. We expect to recognize the cost of these unvested awards over a weighted-average period of 1.9 years.
Share-Based Compensation Plans
We have three share-based compensation plans pursuant to which awards are currently being made: (i) the Biogen Idec Inc. 2006 Non-Employee Directors Equity Plan (2006 Directors Plan); (ii) the Biogen Idec Inc. 2008 Amended and Restated Omnibus Equity Plan (2008 Omnibus Plan); and (iii) the Biogen Idec Inc. 19952015 Employee Stock Purchase Plan (ESPP).
Directors Plan
In May 2006 our stockholders approved the 2006 Directors Plan for share-based awards to our directors. Awards granted from the 2006 Directors Plan may include stock options, shares of restricted stock, restricted stock units, stock appreciation rights and other awards in such amounts and with such terms and conditions as may be determined by a committee of our Board of Directors, subject to the provisions of the plan. We have reserved a total of 1.6 million shares of common stock for issuance under the 2006 Directors Plan. The 2006 Directors Plan provides that awards other than stock options and stock appreciation rights will be counted against the total number of shares reserved under the plan in a 1.5-to-1 ratio.

F- 37

BIOGEN IDEC INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


Omnibus Plans
In June 2008 our stockholders approved the 2008 Omnibus Plan for share-based awards to our employees. Awards granted from the 2008 Omnibus Plan may include stock options, shares of restricted stock, restricted stock units, performance shares, shares of phantom stock, stock appreciation rights and other awards in such amounts and with such terms and conditions as may be determined by a committee of our Board of Directors, subject to the provisions of the plan. Shares of common stock available for issuance under the 2008 Omnibus Plan consist of 15.0 million shares reserved for this purpose, plus shares of common stock that remained available for issuance under our 2005 Omnibus Equity Plan on the date that our stockholders approved the 2008 Omnibus Plan, plus shares that were subject to awards under the 2005 Omnibus Equity Plan whichthat remain unissued upon the cancellation, surrender, exchange or termination of such awards. The 2008 Omnibus Equity Plan provides that awards other than stock options and stock appreciation rights will be counted against the total number of shares available under the plan in a 1.5-to-1 ratio.
We have not made any awards pursuant to the 2005 Omnibus Equity Plan since our stockholders approved the 2008 Omnibus Plan, and do not intend to make any awards pursuant to the 2005 Omnibus Equity Plan in the future, except that unused shares under the 2005 Omnibus Equity Plan have been carried over for use under the 2008 Omnibus Plan.

F- 42

BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Stock Options
We currently do not grant stock options to our employees or directors. Outstanding stock options previously granted to our employees and directors generally have a ten-year term and vest over a period of between one and four years, provided the individual continues to serve at Biogen Idec through the vesting dates. Options granted under all plans are exercisable at a price per share not less than the fair market value of the underlying common stock on the date of grant. The estimated fair value of options, including the effect of estimated forfeitures, is recognized over the options’ vesting periods. The fair value of the stock options granted in 2010 was estimated as of the date of grant using a Black-Scholes option valuation model. There were no grants of stock options made in 2014, 20132016, 2015 and 2012.2014. As of December 31, 2016, all outstanding options were exercisable.
The expected life of options granted is derived using assumed exercise rates based on historical exercise patterns and represents the period of time that options granted are expected to be outstanding. Expected stock price volatility is based upon implied volatility for our exchange-traded options and other factors, including historical volatility. After assessing all available information on either historical volatility, implied volatility, or both, we have concluded that a combination of both historical and implied volatility provides the best estimate of expected volatility. The risk-free interest rate used is determined by the market yield curve based upon risk-free interest rates established by the Federal Reserve, or non-coupon bonds that have maturities equal to the expected term. The dividend yield of zero is based upon the fact that we have not historically granted cash dividends, and do not expect to issue dividends in the foreseeable future. Stock options granted prior to January 1, 2006 were valued based on the grant date fair value of those awards, using the Black-Scholes option pricing model, as previously calculated for pro-forma disclosures.
The following table summarizes our stock option activity:
Shares 
Weighted
Average
Exercise
Price
Shares 
Weighted
Average
Exercise
Price
Outstanding at December 31, 2013384,000
 $55.49
Outstanding at December 31, 2015107,000
 $53.94
Granted
 $

 $
Exercised(163,000) $53.46
(41,000) $53.75
Cancelled
 $

 $
Outstanding at December 31, 2014221,000
 $56.98
Outstanding at December 31, 201666,000
 $54.06
The total intrinsic values of options exercised in 2014, 20132016, 2015 and 20122014 totaled $42.7$10.4 million,, $86.2 $38.0 million, and $63.0$42.7 million,, respectively. The aggregate intrinsic values of options outstanding as of December 31, 20142016 totaled $62.6 million.$15.0 million. The weighted average remaining contractual term for options outstanding as of December 31, 20142016 was 3.02.0 years. As of December 31, 2014, all of the options outstanding were exercisable.

F- 38

BIOGEN IDEC INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


The following table summarizes the amount of tax benefit realized for stock options and cash received from the exercise of stock options:
For the Years Ended December 31,For the Years Ended December 31,
(In millions)2014 2013 20122016 2015 2014
Tax benefit realized for stock options$13.0
 $29.4
 $20.9
$4.0
 $11.9
 $13.0
Cash received from the exercise of stock options$8.5
 $28.1
 $38.8
$2.2
 $6.3
 $8.5
Market Stock Units (MSUs)
MSUs awarded to employees prior to 2014 vested in four equal annual increments beginning on the first anniversary of the grant date. Participants may ultimately earn between 0% and 150% of the target number of units granted based on actual stock performance.
MSUs awarded to employees in 2014, 2015 and 2016 vest in three equal annual increments beginning on the first anniversary of the grant date, and participants may ultimately earn between 0% and 200% of the target number of units granted based on actual stock performance.

F- 43

BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

The vesting of these awards is subject to the respective employee’s continued employment. The number of MSUs granted represents the target number of units that are eligible to be earned based on the attainment of certain market-based criteria involving our stock price. The number of MSUs earned is calculated at each annual anniversary from the date of grant over the respective vesting periods, resulting in multiple performance periods. Accordingly, additional MSUs may be issued or currently outstanding MSUs may be cancelled upon final determination of the number of awards earned. Compensation expense, including the effect of forfeitures, is recognized over the applicable service period.
The following table summarizes our MSU activity:
Shares 
Weighted
Average
Grant Date
Fair Value
Shares 
Weighted
Average
Grant Date
Fair Value
Unvested at December 31, 2013550,000
 $128.04
Unvested at December 31, 2015269,000
 $339.89
Granted (a)246,000
 $395.22
168,000
 $328.03
Vested(363,000) $107.89
(155,000) $244.68
Forfeited(30,000) $192.85
(52,000) $371.62
Unvested at December 31, 2014403,000
 $219.29
Unvested at December 31, 2016230,000
 $355.60
(a)
MSUs granted in 20142016 include approximately 22,00015,000, and 27,00020,000, 37,000 and 33,000 MSUs issued in 20142016 based upon the attainment of performance criteria set for 2013 2012, 2011 and 2010,2012, respectively, in relation to awards granted in those years. The remainder of MSUs granted during 20142016 include awards granted in conjunction with our annual awards made in February 20142016 and MSUs granted in conjunction with the hiring of employees. These grants reflect the target number of shares eligible to be earned at the time of grant.
We value grants of MSUs using a lattice model with a Monte Carlo simulation. This valuation methodology utilizes several key assumptions, including the 60 calendar day average closing stock price on grant date for MSUs awarded prior to 2014, the 30 calendar day average closing stock price on the date of grant for MSUs awarded in 2014, 2015 and 2016, expected volatility of our stock price, risk-free rates of return and expected dividend yield.
The assumptions used in our valuation are summarized as follows:
For the Years Ended December 31,For the Years Ended December 31,
2014 20132016 2015 2014
Expected dividend yield—% —%—% —% —%
Range of expected stock price volatility31.7% - 35.1% 21.7% - 25.7%38.2% - 40.7% 31.0% - 33.2% 31.7% - 35.1%
Range of risk-free interest rates0.1% - 0.7% 0.1% - 0.7%0.6% - 0.9% 0.2% - 1.0% 0.1% - 0.7%
30 calendar day average stock price on grant date$280.88 - $335.65 **$260.67 - $304.86 $277.35 - $426.27 $280.88 - $335.65
60 calendar day average stock price on grant date** $150.33 - $240.14
Weighted-average per share grant date fair value$395.22 $193.45$328.03 $493.43 $395.22
The total fair values of MSUs vested in 2014, 20132016, 2015 and 20122014 totaled $39.3 million, $109.0 million and $117.4 million, $50.9 million, and $29.6 million, respectively.

F- 39

BIOGEN IDEC INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


Cash Settled Performance Units (CSPUs)
CSPUs awarded to employees vest in three equal annual increments beginning on the first anniversary of the grant date. The vesting of these awards is subject to the respective employee’s continued employment with such awards settled in cash. The number of CSPUs granted represents the target number of units that are eligible to be earned based on the attainment of certain performance measures established at the beginning of the performance period, which ends on December 31 of each year. Participants may ultimately earn between 0% and 200% of the target number of units granted based on the degree of actual performance metric achievement. Accordingly, additional CSPUs may be issued or currently outstanding CSPUs may be cancelled upon final determination of the number of units earned. CSPUs awarded prior to 2014 are settled in cash based on the 60 calendar day average closing stock price through each vesting date once the actual vested and earned number of units is known. CSPUs awarded in 2014, 2015 and 2016 will be settled in cash based on the 30 calendar day average closing stock price through each vesting date, once the actual vested and earned number of units is known. Since no shares are issued, these awards willdo not dilute equity. Compensation expense, including the effect of forfeitures, is recognized over the applicable service period.

F- 44

BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

The following table summarizes our CSPU activity:
 Shares
Unvested at December 31, 20132015514,000192,000
Granted (a)177,00086,000
Vested(316,000117,000)
Forfeited(40,00039,000)
Unvested at December 31, 20142016335,000122,000
(a)
CSPUs granted in 2014 include approximately 106,000 CSPUs issued in 2014 based upon the attainment of performance criteria set for 2013 in relation to awards granted in 2013. The remainder of the CSPUs granted in 20142016 include awards granted in conjunction with our annual awards made in February 20142016 and CSPUs granted in conjunction with the hiring of employees. These grants reflect the target number of shares eligible to be earned at the time of grant.
The total cash paid in settlement of CSPUs vested in 2014, 20132016, 2015 and 20122014 totaled $31.9 million, $79.8 million and $92.8 million, $48.3 million, and $28.7 million, respectively. 
Performance-vested Restricted Stock Units (PUs)
Beginning in the first quarter ofIn 2014 we revised our long term incentive program to include a new type of award granted to certain employees in the form of restricted stock units that may be settled in cash or shares of our common stock at the sole discretion of the Compensation and Management Development Committee of our Board of Directors. These awards are structured and accounted for the same way as the cash settled performance units, and vest in three equal annual increments beginning on the first anniversary of the grant date. The number of PUs granted represents the target number of units that are eligible to be earned based on the attainment of certain performance measures established at the beginning of the performance period, which ends on December 31 of each year. Participants may ultimately earn between 0% and 200% of the target number of units granted based on the degree of actual performance metric achievement. Accordingly, additional PUs may be issued or currently outstanding PUs may be cancelled upon final determination of the number of units earned. PUs settling in cash are based on the 30 calendar day average closing stock price through each vesting date once the actual vested and earned number of units is known. Compensation expense, including the effect of forfeitures, is recognized over the applicable service period.
The following table summarizes our PU activity:
 Shares
Unvested at December 31, 20132015103,000
Granted (a)57,00055,000
Vested(31,000
)
Forfeited(17,000
)
Unvested at December 31, 2014201657,000110,000

(a)PUs granted in 2016 include awards granted in conjunction with our annual awards made in February 2016 and PUs granted in conjunction with the hiring of employees. These grants reflect the target number of shares eligible to be earned at the time of grant.
F- 40

TableDuring 2015 32,000 PU were converted to share settlements, of Contentswhich approximately 11,000 shares were vested and issued. All other PUs that vested in 2015 were settled in cash totaling $12.4 million.
BIOGEN IDEC INC. AND SUBSIDIARIESAll PUs that vested in 2016 were settled in cash totaling $8.1 million.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


Time-Vested Restricted Stock Units (RSUs)
RSUs awarded to employees generally vest no sooner than one-third per year over three years on the anniversary of the date of grant, or upon the third anniversary of the date of the grant, provided the employee remains continuously employed with us, except as otherwise provided in the plan. Shares of our common stock will be delivered to the employee upon vesting, subject to payment of applicable withholding taxes. RSUs awarded to directors for service on our Board of Directors vest on the first anniversary of the date of grant, provided in each case that the director continues to serve on our Board of Directors through the vesting date. Shares of our common stock will be delivered to the director upon vesting and are not subject to any withholding taxes. The fair value of all RSUs is based on the market value of our stock on the date of grant. Compensation expense, including the effect of forfeitures, is recognized over the applicable service period.

F- 45

BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

The following table summarizes our RSU activity:
Shares 
Weighted
Average
Grant Date
Fair Value
Shares 
Weighted
Average
Grant Date
Fair Value
Unvested at December 31, 20131,660,000
 $135.95
Unvested at December 31, 2015810,000
 $323.87
Granted (a)464,000
 $321.72
649,000
 $268.52
Vested(885,000) $117.74
(406,000) $285.13
Forfeited(102,000) $193.24
(165,000) $310.30
Unvested at December 31, 20141,137,000
 $221.01
Unvested at December 31, 2016888,000
 $303.49
(a)
RSUs granted in 20142016 primarily represent RSUs granted in conjunction with our annual awards made in February 20142016 and awards made in conjunction with the hiring of new employees. RSUs granted in 20142016 also include approximately 9,00011,000 RSUs granted to our Board of Directors.
RSUs granted in 20132015 and 20122014 had weighted average grant date fair values of $176.53$388.88 and $124.54,$321.72, respectively.
The total fair values of RSUs vested in 2014, 20132016, 2015 and 20122014 totaled $104.6 million, $239.7 million and $281.1 million, $209.7 million, and $191.9 million, respectively. 
Employee Stock Purchase Plan (ESPP)
In June 2015 our stockholders approved the Biogen Inc. 2015 ESPP (2015 ESPP). The 2015 ESPP, which became effective on July 1, 2015, replaced the Biogen Idec Inc. 1995 ESPP (1995 ESPP), which expired on June 30, 2015. The maximum aggregate number of shares of our common stock that may be purchased under the 2015 ESPP is 6.2 million.
The following table summarizes our ESPP activity:
 For the Years Ended December 31,
(In millions, except share amounts)2014 2013 2012
Shares issued under ESPP180,000
 245,000
 274,000
Cash received under ESPP$46.4
 $38.7
 $28.7
 For the Years Ended December 31,
(In millions, except share amounts)2016 2015 2014
Shares issued under the 2015 ESPP190,000
 78,000
 **
Shares issued under the 1995 ESPP
 98,000
 180,000
Cash received under the 2015 ESPP$41.5
 $19.3
 **
Cash received under the 1995 ESPP$
 $30.0
 $46.4

F- 4146

BIOGEN IDEC INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

16.      Income Taxes

17.  Income Taxes
Income Tax Expense
Income before income tax provision and the income tax expense consist of the following:
For the Years Ended December 31,For the Years Ended December 31,
(In millions)2014 2013 20122016 2015 2014
Income before income taxes (benefit):          
Domestic$2,557.4
 $1,953.0
 $1,398.0
$3,655.4
 $3,386.7
 $2,557.4
Foreign1,389.2
 527.6
 457.1
1,277.6
 1,380.6
 1,389.2
Total$3,946.6
 $2,480.6
 $1,855.1
$4,933.0
 $4,767.3
 $3,946.6
Income tax expense (benefit):          
Current:          
Federal$1,159.5
 $700.9
 $507.9
$1,304.3
 $1,214.1
 $1,159.5
State65.2
 98.4
 35.6
55.1
 38.6
 65.2
Foreign73.4
 46.8
 44.0
52.9
 54.5
 73.4
Total1,298.1
 846.1
 587.5
1,412.3
 1,307.2
 1,298.1
Deferred:          
Federal$(280.9) $(200.6) $(133.0)$(125.6) $(129.6) $(280.9)
State(21.0) (35.9) (13.0)(3.8) (1.9) (21.0)
Foreign(6.3) (8.6) 29.1
(45.6) (14.1) (6.3)
Total(308.2) (245.1) (116.9)(175.0) (145.6) (308.2)
Total income tax expense$989.9
 $601.0
 $470.6
$1,237.3
 $1,161.6
 $989.9
The 2012 deferred tax expense on foreign earnings includes an expense of $33.1 million related to capitalized interest at our Denmark manufacturing facility. Of this amount, $29.0 million represents the correction of an error in our accounting that had accumulated over several prior years. We do not consider this correction to be material.
Deferred Tax Assets and Liabilities
Significant components of our deferred tax assets and liabilities are summarized as follows:
As of December 31,As of December 31,
(In millions)2014 20132016 2015
Deferred tax assets:      
Tax credits$69.0
 $64.1
$201.1
 $189.3
Inventory, other reserves, and accruals217.3
 169.6
Inventory, other reserves and accruals250.6
 243.9
Intangibles, net251.7
 124.2
459.8
 328.3
Net operating loss20.6
 14.7
65.9
 24.7
Share-based compensation86.0
 85.0
61.5
 63.8
Other60.0
 84.8
49.0
 35.8
Valuation allowance(11.5) (1.5)(16.1) (14.1)
Total deferred tax assets$693.1
 $540.9
$1,071.8
 $871.7
Deferred tax liabilities:      
Purchased intangible assets$(432.8) $(550.8)$(376.6) $(440.1)
Unrealized gain on investments and cumulative translation adjustment
 (3.2)
Inventory, other reserves and accruals(1.1) (24.9)
Depreciation, amortization and other(105.9) (112.6)(113.5) (102.7)
Total deferred tax liabilities$(539.8) $(691.5)$(490.1) $(542.8)
In addition to deferred tax assets and liabilities, we have recorded prepaid tax and deferred charges related to intercompany transactions. As of December 31, 20142016 and 2013,2015, the total deferred charges and prepaid taxes were $238.9$989.8 million and $248.9$697.9 million, respectively.


F- 4247

BIOGEN IDEC INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


During 2013, we recorded a deferred charge of $203.7 million in connection with an intercompany transfer of the intellectual property for ZINBRYTA. The net book value of this deferred charge as of December 31, 2014 and 2013 was $179.9 million and $193.5 million, respectively. The deferred charge will be amortized to income tax expense over the economic life of the ZINBRYTA program. If the ZINBRYTA program were to be discontinued, we will accelerate the amortization of this deferred charge and record an expense equal to its remaining net book value.
Tax Rate
A reconciliation between the U.S. federal statutory tax rate and our effective tax rate is summarized as follows:
For the Years Ended December 31,For the Years Ended December 31,
2014 2013 20122016 2015 2014
Statutory rate35.0 % 35.0 % 35.0 %35.0 % 35.0 % 35.0 %
State taxes1.2
 3.1
 0.9
0.9
 0.5
 1.2
Taxes on foreign earnings(9.5) (6.7) (6.2)(9.6) (10.0) (9.5)
Credits and net operating loss utilization(1.1) (2.6) (3.5)(1.4) (1.3) (1.1)
Purchased intangible assets1.2
 1.5
 1.2
1.2
 1.0
 1.2
Manufacturing deduction(1.8) (6.6) (2.1)(1.9) (1.8) (1.8)
Other permanent items0.5
 0.8
 (0.4)0.5
 0.7
 0.5
Contingent consideration(0.4) 
 0.5
Other
 (0.3) 
0.4
 0.3
 (0.4)
Effective tax rate25.1 % 24.2 % 25.4 %25.1 % 24.4 % 25.1 %
Our effective tax rate for 20142016 compared to 20132015 increased primarily asdue to a resultnet state tax benefit in 2015 resulting from the remeasurement of the absenceone of a benefit related to the 2013 change in our uncertain tax position related to our U.S. federal manufacturing deduction and our unconsolidated joint businesspositions, described below, under "Accounting for Uncertainty in Income Taxes", lower current year expenses eligible for the orphan drug credit and a lowerhigher relative manufacturing deduction due to unqualified products, partially offset by a higher percentage of our 2014 incomeearnings being earned outsideattributed to the U.S., a higher tax jurisdiction.
Our effective tax rate for 20132015 compared to 2012 decreased primarily as2014 benefited from lower taxes on foreign earnings and reflects a result of a change in our uncertain tax position related to our U.S. federal manufacturing deduction and our unconsolidated joint business, described below under "Accounting for Uncertainty in Income Taxes", lower intercompany royalties owed by a foreign wholly owned subsidiary to a U.S. wholly owned subsidiary on$27.0 million benefit from the international sales2015 remeasurement of one of our products, the reinstatement of the federal research and developmentuncertain tax credit and the 2012 correction of an error in our deferred tax accounting, which increased our rate in the prior year. These favorable items were partially offset by higher relative earnings in the U.S. from the commercial launch of TECFIDERA, lower orphan drug credits due to reduced expenditures in eligible clinical trials and higher state taxes.positions.
As of December 31, 2014,2016, we had net operating losses and general business credit carry forwards for federal income tax purposes of approximately $28.5$22.5 million and $6.6$140.0 million,, respectively, which begin to expire in 2020. Additionally, for state income tax purposes, we had net operating loss carry forwards of approximately $108.1$86.4 million,, which begin to expire in 2015.2017. For state income tax purposes, we also had research and investment credit carry forwards of approximately $116.8$126.6 million,, which begin to expire in 2015.2017. For foreign income tax purposes, we had $29.4$489.4 million of net operating loss carryforwards, which begin to expire in 2020.2021.
In assessing the realizability of our deferred tax assets, we have considered whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. In making this determination, under the applicable financial reporting standards, we are allowed to consider the scheduled reversal of deferred tax liabilities, projected future taxable income and tax planning strategies. Our estimates of future taxable income take into consideration, among other items, our estimates of future income tax deductions related to the exercise of stock options. Based upon the level of historical taxable income and income tax liability and projections for future taxable income over the periods in which the deferred tax assets are utilizable, we believe it is more likely than not that we will realize the net benefits of the deferred tax assets of our wholly owned subsidiaries. In the event that actual results differ from our estimates or we adjust our estimates in future periods, we may need to establish a valuation allowance, which could materially impact our financial position and results of operations.

F- 43

BIOGEN IDEC INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


As of December 31, 2014,2016, undistributed foreign earnings of non-U.S. subsidiaries included in consolidated retained earnings and other basis differences aggregated approximately $4.6 billion.$7.6 billion. We intend to reinvest these earnings indefinitely in operations outside the U.S. The residual U.S. tax liability, if cumulative amounts were repatriated, would be between $1.5$1.8 billion to $1.6$2.3 billion as of December 31, 2014.2016.

F- 48

BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Accounting for Uncertainty in Income Taxes
A reconciliation of the beginning and ending amount of our unrecognized tax benefits is summarized as follows:
(In millions)2014 2013 20122016 2015 2014
Balance at January 1,$110.1
 $125.9
 $64.4
$67.9
 $131.5
 $110.1
Additions based on tax positions related to the current period20.8
 11.9
 13.0
7.2
 10.5
 20.8
Additions for tax positions of prior periods86.1
 71.7
 69.8
36.3
 19.5
 86.1
Reductions for tax positions of prior periods(23.4) (92.1) (18.6)(13.3) (49.9) (23.4)
Statute expirations(1.6) (1.9) (1.9)(1.4) (1.2) (1.6)
Settlements(60.5) (5.4) (0.8)(64.3) (42.5) (60.5)
Balance at December 31,$131.5
 $110.1
 $125.9
$32.4
 $67.9
 $131.5
We and our subsidiaries are routinely examined by various taxing authorities. We file income tax returns in the U.S. federal jurisdiction, various U.S. states, and foreign jurisdictions. With few exceptions, including the proposed disallowance we discuss below, we are no longer subject to U.S. federal tax examination for years before 2013 or state, local, or non-U.S. income tax examinations for years before 2004.2005.
Included in the balance of unrecognized tax benefits as of December 31, 2014, 20132016, 2015 and 20122014 are $53.6$26.9 million,, $32.5 $15.7 million and $109.5$53.6 million (net of the federal benefit on state issues), respectively, of unrecognized tax benefits that, if recognized, would affect the effective income tax rate in future periods.
We recognize potential interest and penalties accrued related to unrecognized tax benefits in income tax expense. In 2014,2016 we recognized a net interest expense of $4.1 million. During 2013,$9.1 million. In 2015 we recognized net interest expense of $4.5 million.$3.1 million. In 2012,2014 we recognized a net interest expense of approximately $0.1$4.1 million. We have accrued approximately $17.6$25.2 million and $11.3$12.5 million for the payment of interest as of December 31, 20142016 and 2013,2015, respectively.
In December 2014,March 2015 we received a notice offinal assessment from the Danish Tax Authority (SKAT) for fiscal 2009 regarding withholding taxes and the treatment of certain intercompany transactions involving oura Danish affiliate and another of our affiliates. The audits of our tax filingsIn April 2016 we received final assessments from the SKAT for 2010 through2011 and 2013 are not completed but have been prepared in a manner consistent with prior filings, withregarding withholding taxes for similar transactions, which may result in an assessment for those years.intercompany transactions. The total amount assessed for 2009, 2011 and 2013 is $51.1estimated to be $58.3 million,, including interest. For the assessments related to 2011 and 2013 we have made payments to SKAT totaling $12.2 million. We continue to dispute the assessments for all of these periods potentially under dispute, weand believe that the positions taken in our taxhistorical filings are valid and we are contesting the assessment vigorously.valid.
Federal Uncertain Tax Positions
During 2013, we received updated technical guidance from the IRS concerning our current and prior year filings and calculation of our U.S. federal manufacturing deduction and overall tax classification of our unconsolidated joint business. Based on this guidance we reevaluated the level of our unrecognized benefits related to uncertain tax positions, and recorded a $49.8 million income tax benefit. This benefit is for a previously unrecognized position and relates to years 2005 through 2012. We recorded an offsetting expense of $11.3 million for non-income based state taxes, which is recorded in other income (expense) within our consolidated statements of income.
In October 2011, in conjunction with our examination, the IRS proposed a disallowance of approximately $130 million in deductions for tax years 2007, 2008 and 2009 related to payments for services provided by our wholly owned Danish subsidiary located in Hillerød, Denmark. We believe that these items represent valid deductible business expenses and are vigorously defending our position. We have initiated a mutual agreement procedure between the IRS and SKAT for the years 2001 through 2009, in an attempt to reach agreement on the issue. In addition, we have applied for a bilateral advanced pricing agreement for the years 2010 through 2014 to resolve similar issues for the subsequent years.

F- 44

BIOGEN IDEC INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


During the year ended December 31, 2014,2015, the net effect of adjustments to one of our uncertain tax positions was a net expensebenefit of $2.0approximately $27.0 million,. primarily related to the state impact of a federal uncertain tax item.
It is reasonably possible that we will adjust the value of our uncertain tax positions related to our unconsolidated joint businessrevenues from anti-CD20 therapeutic programs and certain transfer pricing issues as we receive additional information from various taxing authorities, including reaching settlements with the authorities. In addition, the IRS and other national tax authorities routinely examine our intercompany transfer pricing with respect to intellectual property related transactions and it is possible that they may disagree with one or more positions we have taken with respect to such valuations.

F- 49

18.  Other Consolidated Financial Statement Detail
BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

17.      Other Consolidated Financial Statement Detail
Supplemental Cash Flow Information
Supplemental disclosure of cash flow information for the years ended December 31, 2014, 20132016, 2015 and 2012,2014, is as follows:
For the Years Ended December 31,For the Years Ended December 31,
(In millions)2014 2013 20122016 2015 2014
Cash paid during the year for:          
Interest$41.2
 $53.6
 $65.4
$281.2
 $39.1
 $41.2
Income taxes$1,163.2
 $643.2
 $526.6
$1,642.2
 $1,674.8
 $1,163.2
Non-cash Operating, Investing and Financing Activity
In December 2016 we accrued $454.8 million related to the recent settlement and license agreement with Forward Pharma A/S (Forward Pharma). For additional information related to this transaction, please read Note 21, Commitment and Contingencies to these consolidated financial statements.
In the fourth quarter of 2014,2016 we accrued $250.0$300.0 million upon reaching $4.0$11.0 billion in total cumulative sales of Fumapharm Products. The amount, net of tax benefit, was accounted for as an increase to goodwill in accordance with the accounting standard applicable to business combinations when we acquired Fumapharm and is expected to be paid in the first quarter of 2015.2017. For additional information related to this transaction, please read Note 22,21, CommitmentCommitments and Contingencies to these consolidated financial statements.
In July and November 2013,connection with the construction of two office buildingsour manufacturing facility in Cambridge, Massachusetts was completedSolothurn, Switzerland, we accrued charges related to processing equipment and we started leasing the facilities. Upon completion of the construction of the buildings, we determined that we were no longer considered the owner of the buildings because we did not have any unusual or significant continuing involvement.  Consequently, we derecognized the buildings and their associated financing obligationengineering services of approximately $161.5$100.0 million fromin our consolidated balance sheet. For additional information related to this transaction, please read Note 10, Property, Plant and Equipment to these consolidated financial statements.
In March 2012,February 2015 upon completion of our acquisition of Stromedix,Convergence, we recorded $219.2 million of in-process research and development and $48.2 million of goodwill. In addition, we also recorded a contingent consideration obligation of $274.5 million as part of the purchase price. For additional information related to this transaction, please read Note 2, $122.2 millionAcquisitions. to these consolidated financial statements.
Other Income (Expense), Net
Components of other income (expense), net, are summarized as follows:
For the Years Ended December 31,For the Years Ended December 31,
(In millions)2014 2013 20122016 2015 2014
Interest income$12.2
 $8.2
 $29.5
$63.4
 $22.1
 $12.2
Interest expense(29.5) (31.9) (36.5)(260.0) (95.5) (29.5)
Impairments on investments
 (2.8) (5.5)
Gain (loss) on investments, net11.8
 21.7
 10.6
6.0
 (3.8) 11.8
Foreign exchange gains (losses), net(11.6) (15.2) (2.5)(9.8) (32.7) (11.6)
Other, net(8.7) (14.9) 3.7
(17.0) (13.8) (8.7)
Total other income (expense), net$(25.8) $(34.9) $(0.7)$(217.4) $(123.7) $(25.8)
Other Current Assets
Other current assets include prepaid taxes totaling approximately $817.0 million and $550.6 million as of December 31, 2016 and 2015, respectively.

F- 4550

BIOGEN IDEC INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


Accrued Expenses and Other
Accrued expenses and other consists of the following:
As of December 31,As of December 31,
(In millions)2014 20132016 2015
Current portion of contingent consideration obligations$580.8
 $504.7
Accrued TECFIDERA litigation settlement and license charges454.8
 
Revenue-related reserves for discounts and allowances438.6
 518.1
Employee compensation and benefits$393.8
 $343.4
282.9
 270.8
Revenue-related rebates344.0
 264.9
Current portion of contingent consideration obligations265.5
 54.0
Royalties and licensing fees172.4
 160.7
195.8
 167.9
Deferred revenue120.9
 172.7
Clinical development expenses65.9
 55.2
Construction in progress134.0
 87.9
Collaboration expenses130.9
 31.2
Other456.8
 304.3
685.7
 516.2
Total accrued expenses and other$1,819.3
 $1,355.2
$2,903.5
 $2,096.8
Other Long-Term LiabilitiesPricing of TYSABRI in Italy - AIFA
Other long-term liabilities consistsIn the fourth quarter of 2011 Biogen Italia SRL, our Italian subsidiary, received a notice from the Italian National Medicines Agency (Agenzia Italiana del Farmaco or AIFA) that sales of TYSABRI after mid-February 2009 through mid-February 2011 exceeded by EUR30.7 million a reimbursement limit established pursuant to a Price Determination Resolution granted by AIFA in December 2006. In January 2012 we filed an appeal against AIFA in administrative court in Rome, Italy seeking a ruling that the reimbursement limit in the Price Determination Resolution should apply as written to only “the first 24 months” of TYSABRI sales, which ended in mid-February 2009. That appeal is still pending. Since being notified in the fourth quarter of 2011 that AIFA believed a reimbursement limit was still in effect, we deferred revenue on sales of TYSABRI as if the reimbursement limit were in effect for each biannual period beginning in mid-February 2009.
In July 2013 we negotiated an agreement in principle with AIFA's Price and Reimbursement Committee that would have resolved all of AIFA's claims relating to sales of TYSABRI in excess of the following:reimbursement limit for the periods from February 2009 through January 2013 for an aggregate repayment of EUR33.3 million. As a result of this agreement in principle, we recorded a liability and reduction to revenue of EUR15.4 million at June 30, 2013, which approximated 50% of the claim related to the period from mid-February 2009 through mid-February 2011. As of December 31, 2016, we have approximately EUR79 million recorded as accrued expenses and other in our consolidated balance sheets for the periods mid-February 2009 through January 2013, respectively.
In June 2014 AIFA approved a resolution affirming that there is no reimbursement limit from and after February 2013. As a result, we recognized $53.5 million of TYSABRI revenues related to the periods February 2013 through June 2014 that were previously deferred.
In January 2017 we negotiated an agreement in principle with AIFA's Price and Reimbursement Committee to settle all of AIFA's existing claims relating to sales of TYSABRI in excess of the reimbursement limit for the periods from February 2009 through January 2013 for an aggregate repayment of EUR37.4 million. The agreement is subject to ratification by AIFA. If this most recent settlement agreement is accepted, we will recognize approximately EUR42 million in revenue upon final resolution of this matter.

F- 51

BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)
 As of December 31,
(In millions)2014 2013
Employee compensation and benefits$200.7
 $161.5
Contingent consideration obligation200.0
 251.9
Taxes payable142.2
 177.1
Other107.2
 68.7
Total other long-term liabilities$650.1
 $659.2

19. Investments in Variable Interest Entities
18.     Investments in Variable Interest Entities
Consolidated Variable Interest Entities
Our consolidated financial statements include the financial results of variable interest entities in which we are the primary beneficiary.
Knopp
In August 2010, we entered into a license agreement with Knopp Neurosciences, Inc. (Knopp), a subsidiary of Knopp Holdings, LLC, for the development, manufacture and commercialization of dexpramipexole. Under the terms of the license agreement we made a $26.4 million upfront payment and agreed to pay Knopp development and sales-based milestone payments as well as royalties on future commercial sales. In addition, we also purchased 30.0% of the Class B common shares of Knopp for $60.0 million. Upon entering into the license agreement, we began consolidating the results of Knopp as we determined that we had the power through the license agreement to direct the activities that most significantly impacted its economic performance and were therefore its primary beneficiary.
At the end of December 2012, we learned that a Phase 3 trial investigating dexpramipexole in people with amyotrophic lateral sclerosis (ALS) did not meet its primary endpoint and failed to show efficacy in its key secondary endpoints. Based on these results, we discontinued development of dexpramipexole in ALS. In 2013, we terminated The following are our license agreement and executed our put option on our Class B common shares. We deconsolidated the results of Knopp upon termination of the license agreement.significant variable interest entities.
During the year ended December 31, 2012, $113.0 million of expense was reflected within our consolidated statements of income.

F- 46

BIOGEN IDEC INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


Neurimmune SubOne AG
In 2007 we entered into a collaboration agreement with Neurimmune SubOne AG (Neurimmune), a subsidiary of Neurimmune AG, for the development and commercialization of antibodies for the treatment of Alzheimer’s disease. Neurimmune conducts research to identify potential therapeutic antibodies and we are responsible for the development, manufacturing and commercialization of all products. Our anti-amyloid beta antibody, BIIB037 program,aducanumab, for the treatment of Alzheimer’s disease resulted from this collaboration. In December 2014,September 2015 we reported positive interim data fromannounced that the first patient had been enrolled in a Phase 1b3 trial for aducanumab, which triggered a $60.0 million milestone payment due to Neurimmune. As we consolidate the financial results of BIIB037.Neurimmune, we recognized this payment as a charge to noncontrolling interest in the third quarter of 2015. Based upon our current development plans for aducanumab, we may pay Neurimmune up to $335.0$275.0 million in remaining milestone payments, of which $60.0 million is due upon the initiation of a late stage clinical trial.payments. We may also pay royalties in the low-to-mid-teens on sales of any resulting commercial products.
We determined that we are the primary beneficiary of Neurimmune because we have the power through the collaboration to direct the activities that most significantly impact the entity’s economic performance and are required to fund 100% of the research and development costs incurred in support of the collaboration agreement. Accordingly, we consolidate the results of Neurimmune.
AmountsWe are required to reimburse Neurimmune for amounts that are incurred by Neurimmune for research and development expenses in support of the collaboration that we reimbursecollaboration. Amounts reimbursed are reflected in research and development expense in our consolidated statements of income. InDuring the second quarter ofyears ending December 31, 2016, 2015 and 2014, we recorded a $10.0 million milestone payment in connection with the achievement of certain clinical goals in the Phase 1 trial of our BIIB037 program for Alzheimer’s disease, which was reflected as a charge to noncontrolling interests, net of tax, within our consolidated statements of income.these amounts were immaterial. Future milestone payments and royalties, if any, will be reflected withinin our consolidated statements of income as a charge to the noncontrolling interest, net of tax, when such milestones are achieved. During the years ending December 31, 2014, 2013 and 2012, $44.1 million, $27.2 million and $13.3 million, respectively, of expense was reflected within our consolidated statements of income.
The assets and liabilities of Neurimmune are not significant to our financial position or results of operations as it is a research and development organization. We have provided no financing to Neurimmune other than previously contractually required amounts.
Rodin Therapeutics, Inc.
In December 2015 we paid $8.0 million for preferred stock in Rodin Therapeutics, Inc. (Rodin) and entered into an option and collaboration agreement which gave us the right to purchase all remaining outstanding shares of Rodin at any time until 35 days after acceptance of an Investigational New Drug (IND) application by the FDA. As we determined that we were the primary beneficiary of Rodin, we consolidated the results of Rodin and recorded an IPR&D intangible asset of approximately $8.7 million and assigned approximately $10.9 million to noncontrolling interest.
During the fourth quarter of 2016 we terminated our collaboration agreement with Rodin. Upon termination of the collaboration agreement, we deconsolidated the results of Rodin and impaired the IPR&D asset, resulting in an impairment loss of $8.7 million related to the IPR&D asset recorded upon entering into the collaboration agreement.
The assets and liabilities of Rodin were not significant to our financial position or results of operations as Rodin is a research and development organization. We had provided no financing to Rodin other than the contractually required amounts disclosed above.
Ataxion Inc.
In February 2014 we paid $1.6 million for preferred stock ofin Ataxion, Inc. (Ataxion) and entered into an option and collaboration agreement which givesgave us the right to purchase all outstanding shares of Ataxion at any time until 30 days after delivery of a Phase 1 clinical trial study report. Ataxion is a discovery-stage biopharmaceutical company developing product candidates focused on a group of orphan genetic disorders referred to as hereditary ataxias. We committed to make additional investments in Ataxion's preferred shares of up to $6.2 million if certain development milestones are achieved. In December 2014,As we made an additional investment of $2.3 million in Ataxion as the first development milestone was achieved. Ifdetermined that we exercise our option to purchase the outstanding shares of Ataxion, we could pay additional amounts upon achievement of clinical and commercial milestones.
In the Ataxion relationship, through our fixed price option to purchase the company, purchases of equity and presence on the program advisory committee, we are deemed to bewere the primary beneficiary of Ataxion, a variable interest entity. Therefore, we consolidateconsolidated the results of Ataxion. As part of the initial consolidation of Ataxion weand recorded an IPR&D intangible asset of $3.5 million and assigned that amount to minority interest withinnoncontrolling interest.

F- 52

BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

During the fourth quarter of 2016 we terminated our shareholders' equity.option agreement with Ataxion. Upon termination of the collaboration agreement, we deconsolidated the results of Ataxion and impaired the IPR&D asset, resulting in an impairment loss of $3.5 million related to the IPR&D asset recorded upon entering into the collaboration agreement.
The assets and liabilities of Ataxion arewere not significant to our financial position or results of operations as itAtaxion is a research and development organization. We havehad provided no financing to Ataxion other than the contractually required amounts.amounts disclosed above.
Unconsolidated Variable Interest Entities
We have relationships with other variable interest entities that we do not consolidate as we lack the power to direct the activities that significantly impact the economic success of these entities. These relationships include investments in certain biotechnology companies.companies and research collaboration agreements.
As of December 31, 20142016 and 2013,2015, the total carrying value of our investments in biotechnology companies that we have determined to be variable interest entities, but do not consolidate as we do not have the power to direct their activities, totaled $7.9$47.4 million and $5.5$29.2 million,, respectively. Our maximum exposure to loss related to these variable interest entities is limited to the carrying value of our investments.
We have also entered into research collaborationscollaboration agreements with certain variable interest entities where we are required to fund certain development activities. These development activities are included in research and development expense withinin our consolidated statements of income, as they are incurred. We have provided no financing to these variable interest entities other than previously contractually required amounts.

F- 47

BIOGEN IDEC INC. AND SUBSIDIARIES19.      Collaborative and Other Relationships
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


20.  Collaborative and Other Relationships
In connection with our business strategy, we have entered into various collaboration agreements which provide us with rights to develop, produce and market products using certain know-how, technology and patent rights maintained by our collaborative partners. Terms of the various collaboration agreements may require us to make milestone payments upon the achievement of certain product research and development objectives and pay royalties on future sales, if any, of commercial products resulting from the collaboration.
Depending on the collaborative arrangement, we may record funding receivablesreceivable or payable balances with our partners, based on the nature of the cost-sharing mechanism and activity within the collaboration. Our significant collaboration arrangements are discussed below.
Genentech (Roche Group)
We collaboratehave certain business and financial rights with respect to RITUXAN for the treatment of non-Hodgkin's lymphoma (NHL), chronic lymphocytic leukemia (CLL) and other conditions, GAZYVA indicated for the treatment of CLL and follicular lymphoma, and other potential anti-CD20 therapies under a collaboration agreement with Genentech, onInc. (Genentech), a wholly-owned member of the development and commercialization of RITUXAN. In addition, in the U.S., we share operating profits and losses relating to GAZYVA with Genentech.Roche Group. The Roche Group and its sub-licensees maintain sole responsibility for the development, manufacturing and commercialization of GAZYVA in the U.S.
Our collaboration agreement will continue in effect until we mutually agree to terminate the collaboration, except that if we undergo a change in control, as defined in the collaboration agreement, Genentech has the right to present an offer to buy the rights to RITUXAN and we must either accept Genentech’s offer or purchase Genentech’s rights on the same terms as its offer. Genentech will also be deemed concurrently to have purchased our rights to any other anti-CD20 products in development in exchange for a royalty and our rights to GAZYVA in exchange for the compensation described in the table below. Our collaboration with Genentech was created through a contractual arrangement and not through a joint venture or other legal entity.
RITUXAN
Genentech is responsible for the worldwide manufacturing of RITUXAN. Development and commercialization rights and responsibilities under this collaboration are divided as follows:
U.S.
We share with Genentech co-exclusive rights to develop, commercialize and market RITUXAN in the U.S.
Canada
We and Genentech have assigned our rights under our collaboration agreement with respect to Canada to Roche.
Outside the U.S. and Canada
We have granted Genentech exclusive rights to develop, commercialize and market RITUXAN outside the U.S. and Canada. Under the terms of separate sublicense agreements between Genentech and Roche, development and commercialization of RITUXAN outside the U.S. and Canada is the responsibility of Roche and its sublicensees. We do not have any direct contractual arrangements with Roche or it sublicensees.
Under the terms of the collaboration agreement, Roche pays us royalties between 10% and 12% on sales of RITUXAN outside the U.S. and Canada, with the royalty period lasting 11 years from the first commercial sale of RITUXAN on a country-by-country basis. The royalty periods for the substantial portion of the royalty-bearing sales in the rest of world markets expired during 2012 and 2013. We expect future revenue on sales of RITUXAN in the rest of world will be limited to our share of pre-tax co-promotion profits in Canada.
GAZYVA
Prior to approval, we recognized 35% of the development and commercialization expenses as research and development expense and selling, general and administrative expense, respectively, in our consolidated statements of income. After GAZYVA was approved by the FDA in the fourth quarter of 2013, we began to recognize our share of the development and commercialization expenses as a reduction of our share of pre-tax profits in revenues from unconsolidated joint business.
Commercialization of GAZYVA will impact our percentage of the co-promotion profits for RITUXAN, as summarized in the table below.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


Ocrelizumab
Genentech is solely responsible for further development and commercialization of ocrelizumab, a humanized anti-CD20 monoclonal antibody currently in development for MS, and funding future costs. Genentech cannot develop ocrelizumab in CLL, NHL or RA. We will receive tiered royalties between 13.5% and 24% on U.S. sales of ocrelizumab if approved for commercial sale by the FDA. Commercialization of ocrelizumab does not impact the percentage of the co-promotion profits we receive for RITUXAN.
Profit-sharing Formula
RITUXAN
Genentech is responsible for the worldwide manufacturing of RITUXAN. Development and commercialization rights and responsibilities under this collaboration are divided as follows:
U.S.
We share with Genentech co-exclusive rights to develop, commercialize and market RITUXAN in the U.S.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Canada
We and Genentech have assigned our rights under our collaboration agreement with respect to Canada to the Roche Group.
GAZYVA
We recognize our share of the development and commercialization expenses of GAZYVA as a reduction of our share of pre-tax profits in revenues from anti-CD20 therapeutic programs.
Commercialization of GAZYVA impacts our percentage of the co-promotion profits for RITUXAN, as summarized in the table below.
OCREVUS (Ocrelizumab)
Genentech is solely responsible for development and commercialization of OCREVUS, a humanized anti-CD20 monoclonal antibody currently in development for MS, and funding future costs. Genentech cannot develop OCREVUS in CLL, NHL or Rheumatoid Arthritis (RA). We will receive tiered royalties between 13.5% and 24% on U.S. net sales of OCREVUS if approved for commercial sale by the FDA. The FDA has accepted for review the Biologics License Application for OCREVUS for the treatment of relapsing multiple sclerosis (RMS) and primary-progressive multiple sclerosis (PPMS), and has granted the application Priority Review Designation. There will be a 50% reduction to these royalties if a biosimilar to OCREVUS is approved in the U.S. In addition, we will receive a 3% royalty on net sales of OCREVUS outside the U.S., with the royalty period lasting 11 years from the first commercial sale of OCREVUS on a country-by-country basis. In June 2016 the European Medicines Agency (EMA) validated its marketing authorization application (MAA) of OCREVUS for the treatment of RMS and PPMS in the E.U.
Commercialization of OCREVUS will not impact the percentage of the co-promotion profits we receive for RITUXAN or GAZYVA.
Profit-sharing Formulas
RITUXAN Profit Share
Our current pretax co-promotion profit-sharing formula for RITUXAN provides for a 30% share on the first $50.0$50.0 million of co-promotion operating profits earned each calendar year. Our share of annual co-promotion profits in excess of $50.0$50.0 million varies, as summarized in the table below, upon the following events:
Until GAZYVA First Non-CLL FDA Approval40.0%
After GAZYVA First Non-CLL FDA Approval until First GAZYVA Threshold Date39.0%
After First GAZYVA Threshold Date until Second GAZYVA Threshold Date37.5%
After Second GAZYVA Threshold Date35.0%
First Non-CLL GAZYVA FDA Approval means the FDA’s first approval of GAZYVA in an indication other than CLL.
First GAZYVA Threshold Date means the earlier of (1) the date of the First Non-CLL GAZYVA FDA approval if U.S. gross sales of GAZYVA for the preceding consecutive 12 month period were at least $150.0$150.0 million or (2) the first day of the calendar quarter after the date of the First Non-CLL GAZYVA FDA Approval that U.S. gross sales of GAZYVA within any consecutive 12 month period have reached $150.0 million.$150.0 million.
Second GAZYVA Threshold Date means the first day of the calendar quarter after U.S. gross sales of GAZYVA within any consecutive 12 month period have reached $500.0 million.$500.0 million. The Second GAZYVA Threshold Date can be achieved regardless of whether GAZYVA has been approved in a non-CLL indication.
Our share of RITUXAN pre-tax profits in the U.S. decreased to 39% from 40% as GAZYVA was approved by the FDA in follicular lymphoma in February 2016.
In addition, should the FDA approve an anti-CD20 product other than ocrelizumabOCREVUS or GAZYVA that is acquired or developed by Genentech and subject to the collaboration agreement, our share of the co-promotion operating profits would be between 30% and 38% based on certain events.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

GAZYVA Profit Share
Our current pretax profit-sharing formula for GAZYVA provides for a 35% share on the first $50.0$50.0 million of operating profits earned each calendar year. Our share of annual profits in excess of $50.0$50.0 million varies, as summarized in the table below, upon the following events:
Until First GAZYVA Threshold Date39.0%
After First GAZYVA Threshold Date until Second GAZYVA Threshold Date37.5%
After Second GAZYVA Threshold Date35.0%
OurIn 2016, 2015 and 2014, our share of operating losses on GAZYVA is 35%.
Unconsolidated Joint Business Revenues
During the first quarter of 2013, we reduced our share of RITUXAN revenues from unconsolidated joint business by approximately $49.7 million, of which revenue on sales in the rest of world for RITUXAN was reduced by $41.2 million and pre-tax profits in the U.S. were reduced by $8.5 million, to reflect our share of the royalties and interest awarded to Hoechst in its arbitration with Genentech.35%.

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BIOGEN IDEC INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


Revenues from unconsolidated joint businessAnti-CD20 Therapeutic Programs
Revenues from anti-CD20 therapeutic programs are summarized as follows:
 For the Years Ended December 31,
(In millions)2014 2013 2012
Biogen Idec’s share of pre-tax profits in the U.S. for RITUXAN and GAZYVA (1)$1,114.1
 $1,085.2
 $1,031.7
Reimbursement of selling and development expenses in the U.S. for RITUXAN3.0
 2.1
 1.6
Revenue on sales in the rest of world for RITUXAN78.3
 38.7
 104.6
Total unconsolidated joint business revenues$1,195.4
 $1,126.0
 $1,137.9
 For the Years Ended December 31,
(In millions)2016 2015 2014
Biogen's share of pre-tax profits in the U.S. for RITUXAN and GAZYVA, including the reimbursement of selling and development expenses$1,249.5
 $1,269.8
 $1,117.1
Revenue on sales in the rest of world for RITUXAN65.0
 69.4
 78.3
Total revenues from anti-CD20 therapeutic programs$1,314.5
 $1,339.2
 $1,195.4
(1) GAZYVA sales began inIn 2016 the fourth quarter of 2013.
In 2014, 2013, and 2012, the 40%39% profit-sharing threshold was met during the first quarter. In 2015 and 2014, the 40% profit-sharing threshold was met during the first quarter.
Prior to regulatory approval, we record our share of the expenses incurred by the collaboration for the development of anti-CD20 products in research and development expense in our consolidated statements of income. We incurred $25.7 million and $35.4 million in development expense for the years ended December 31, 2013 and 2012, respectively. After an anti-CD20 product is approved, we record our share of the development expenses related to that product as a reduction of our share of pre-tax profits in revenues from unconsolidated joint business.anti-CD20 therapeutic programs.
Elan
On April 2, 2013, we acquired full ownership of all remaining rights to TYSABRI from Elan that we did not already own or control. Upon the closing of the transaction, our collaboration agreement with Elan was terminated. For additional information related to this transaction, please read Note 2, Acquisitions to these consolidated financial statements.
We previously collaborated with Elan on the development, manufacture and commercialization of TYSABRI. Under the terms of our collaboration agreement, we manufactured TYSABRI and collaborated with Elan on the product’s marketing, commercial distribution and ongoing development activities. The agreement was designed to effect an equal sharing of profits and losses generated by the activities of our collaboration. Under the agreement, however, once sales of TYSABRI exceeded specific thresholds, Elan was required to make milestone payments to us in order to continue sharing equally in the collaboration’s results.
In the U.S., we previously sold TYSABRI to Elan who then sold the product to third party distributors. Our sales price to Elan in the U.S. was set prior to the beginning of each quarterly period to effect an approximate equal sharing of the gross profit between Elan and us. We recognized revenue for sales in the U.S. of TYSABRI upon Elan’s shipment of the product to the third party distributors, at which time all revenue recognition criteria had been met. We incurred manufacturing and distribution costs, research and development expenses, commercial expenses, and general and administrative expenses related to TYSABRI. We recorded these expenses to their respective line items within our consolidated statements of income when they were incurred. Research and development and sales and marketing expenses were shared equally with Elan and the reimbursement of these expenses was recorded as reductions of the respective expense categories. During the years ended December 31, 2013 and 2012, we recorded $11.7 million and $43.7 million, respectively, as reductions of research and development expense resulting from reimbursements from Elan. In addition, for the years ended December 31, 2013 and 2012, we recorded $20.6 million and $99.9 million, respectively, as reductions of selling, general and administrative expense resulting from reimbursements from Elan.
In the rest of world, we previously were responsible for distributing TYSABRI to customers and were primarily responsible for all operating activities. Generally, we recognized revenue for sales of TYSABRI in the rest of world at the time of product delivery to our customers. We made payments to Elan which effected an equal sharing of rest of world collaboration operating profits. These payments also included the reimbursement we paid to Elan for half of the third-party royalties that Elan paid on behalf of the collaboration relating to rest of world sales. These amounts were reflected in the collaboration profit sharing line in our consolidated statements of income. For the years ended December 31, 2013 and 2012, $85.4 million and $317.9 million, respectively, was reflected in the collaboration profit sharing line for our collaboration with Elan.

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BIOGEN IDEC INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


Acorda
In 2009 we entered into a collaboration and license agreement with Acorda Therapeutics, Inc. (Acorda) to develop and commercialize products containing fampridine in markets outside the U.S.U.S, including FAMPYRA. We also have responsibility for regulatory activities and the future clinical development of related products in those markets.
In July 2011, the EC granted a conditional marketing authorization for fampridine in the E.U., under the trade name FAMPYRA, which triggered a $25.0 million milestone payment. This payment was made to Acorda in 2011 and was capitalized as an intangible asset.
Under the terms of the collaboration and license agreement, we pay Acorda tiered royalties based on the level of ex-U.S. net sales. We may pay up to $375.0$375.0 million of additional milestone payments to Acorda based on the successful achievement of certain regulatory and commercial milestones. The next expected milestone would be $15.0$15.0 million,, due if ex-U.S. net sales reach $100.0$100.0 million over a period of four consecutive quarters. We will capitalize these additional milestones as intangible assets upon achievement of the milestone which will then be amortized utilizing an economic consumption model and recognized as amortization of acquired intangible assets. Royalty payments are recognized as a cost of goods sold.
In connection with the collaboration and license agreement, we have also entered into a supply agreement with Acorda for the commercial supply of FAMPYRA. This agreement is a sublicense arrangement of an existing agreement between Acorda and Alkermes, who acquired Elan Drug Technologies, the original party to the license with Acorda. During the years ending December 31, 2014, 20132016, 2015 and 2012,2014, total cost of sales related to royalties and commercial supply of FAMPRYA reflected withinin our consolidated statementstatements of income were $29.2$31.5 million, $30.6 million and $29.2 million, respectively.

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

AbbVie
We have a collaboration agreement with AbbVie aimed at advancing the development and commercialization of ZINBRYTA in MS, which was approved for the treatment of relapsing forms of MS in the U.S. in May 2016 and the E.U. in July 2016. We made milestone payments totaling $32.0 million related to these approvals, which were capitalized as intangible assets, net in our consolidated balance sheets.
Under the agreement, we and AbbVie conduct ZINBRYTA co-promotion activities in the U.S., $24.3E.U. and Canadian territories (Collaboration Territory), where development and commercialization costs and profits are shared equally. Outside of the Collaboration Territory, we are solely responsible for development and commercialization of ZINBRYTA and will pay a tiered royalty to AbbVie as a percentage of net sales in the low to high teens.
We are responsible for manufacturing and research and development activities in both the Collaboration Territory and outside the Collaboration Territory and will record these activities within their respective lines in our consolidated statements of income, net of any reimbursement of research and development expenditures received from AbbVie. For the years ended December 31, 2016, 2015 and 2014, the collaboration incurred $48.6 million, $113.8 million and $20.2$117.8 million for research and development activities, for which we recognized $24.3 million, $60.8 million and $67.4 million, respectively, in our consolidated statements of income. During 2015 we made milestone payments of $16.0 million for the development of ZINBRYTA as a result of filing for regulatory approval in the U.S. and E.U. during the year. These payments were recorded as research and development expense in our consolidated statements of income.
Prior to regulatory approval, we also recognized $22.0 million of pre-commercialization expenses within our selling, general and administrative expense, which represents 50% of the collaboration's pre-commercialization costs for 2016. After ZINBRYTA was approved by the FDA and EMA in 2016, we began to recognize our share of the collaboration activities within the U.S., respectively.E.U. and Canadian territories as described below.
Co-promotion Profits and Losses
In the U.S., AbbVie recognizes revenues on sales to third parties and we recognize our 50% share of the co-promotion profits or losses as a component of total revenues in our consolidated statements of income. The collaboration began selling ZINBRYTA in the U.S. in the third quarter of 2016. For the year ended December 31, 2016, we recognized a net reduction in revenue of $21.9 million to reflect our share of an overall net loss within the collaboration.
The following table provides a summary of the U.S. collaboration and our share of the co-promotion losses on ZINBRYTA in the U.S.:
 For the Year Ended December 31,
(In millions)2016
Product revenues, net$6.1
Costs and expenses50.0
Co-promotion losses in the U.S.$43.9
Biogen's share of co-promotion losses in the U.S.$21.9
In the E.U. and Canada, we recognize revenues on sales to third parties in product revenues, net in our consolidated statements of income. We also record the related cost of revenues and sales and marketing expenses to their respective line items in our consolidated statements of income as these costs are incurred. We reimburse AbbVie for their 50% share of the co-promotion profits or losses in the E.U. and Canada. This reimbursement is recognized in collaboration profit (loss) sharing in our consolidated statements of income. We began to recognize product revenues on sales of ZINBRYTA in the E.U. in the third quarter of 2016. For the year ended December 31, 2016, we recognized income of $4.9 million to reflect AbbVie's 50% sharing of the net collaboration losses in the E.U. and Canada.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Swedish Orphan Biovitrum AB (publ)
In January 2007 we acquired 100% of the stock of Syntonix. Syntonix, now known as Bioverativ Therapeutics Inc. (formerly Biogen Hemophilia Inc.), had previously entered into a collaboration agreement with Swedish Orphan Biovitrum AB (publ) (Sobi) to jointly develop and commercialize Factor VIII and Factor IX hemophilia products, including ELOCTATE and ALPROLIX. In February 2010, we restructured theUnder an amended and restated collaboration agreement, and assumed full development responsibilities and costs, as well as manufacturing rights. In addition, the cross-royalty rates were reduced and commercial rights for certain territories were changed. As a result, we now have commercial rights for North America (the Biogen Idec North America Territory) and for rest of the world markets outside of Europe, Russia, Turkey and certain countries in the Middle EastSobi Territory, as defined below (the Biogen Idec Direct Territory). Subject to the exercise of an option right that Sobi controls, Sobi will havehas commercial rights in substantially all of Europe, Russia Turkey and certain countries in Northern Africa and the Middle East (the Sobi Territory). The collaboration agreement was amended and restated in April 2014. (References to the collaboration agreement refer to the amended and restated collaboration agreement).
Under the terms of the collaboration agreement, following our submission of a MAA to the EMA for each product developed under the collaboration, Sobi may exercise an option to take over final regulatory approval, pre-launch and commercialization activities in the Sobi Territory by making a payment into escrow of $10.0 million per product. In November 2014 Sobi exercised its option to assume final development and commercialization ofactivities in the Sobi Territory for ELOCTA (trade(the trade name for ELOCTATE in the E.U.) within. In July 2015 Sobi exercised its option to assume final development and commercialization of ALPROLIX in the Sobi Territory and depositedTerritory. Upon each exercise of opt-in right under the terms of the collaboration agreement, Sobi made a $10.0 million to be heldpayment in escrow. Upon EMA regulatory approval
ELOCTA was approved by the EC in November 2015 and Sobi had its first commercial sale of each such product, Sobi will be liable to reimburse us 50%ELOCTA in January 2016. In March 2016 the EC approved the transfer of the sum of all shared manufacturing and development expenses incurred by usmarketing authorization for ELOCTA in the E.U. from October 1, 2009 through the earlier of the date on whichBiogen to Sobi, is registered asmaking Sobi the marketing authorization holder of ELOCTA in the E.U. As the marketing authorization holder, Sobi assumes full legal responsibility for ELOCTA, from a regulatory perspective, during its entire life cycle in the applicable product or 90 days post-regulatory approval, as well as 100%E.U. As of certain development expenses incurred exclusively for the benefit of the Sobi Territory (the Opt-In Consideration). Through December 31, 2014,2016, approximately $175$144.0 million in expenditures for ELOCTA, may benet of the $10.0 million escrow payment and other royalty adjustments as described in the table and its footnote (3) below, are reimbursable by Sobi under the collaboration agreement due to its election to assume final development and commercialization of ELOCTA within the Sobi Territory, which is the Opt-In Consideration for ELOCTA. This reimbursement will be recognized by us as royalty revenue in proportion to collaboration revenues, over a ten-year period, consistent with the initial patent term of the product.
ALPROLIX was approved in the E.U. by the EC in May 2016 and Sobi had its first commercial sale in June 2016. In September 2016 the EC approved the transfer of the marketing authorization for ALPROLIX in the E.U. from Biogen to Sobi, making Sobi the marketing authorization holder of ALPROLIX in the E.U. As the marketing authorization holder, Sobi assumes full legal responsibility for ALPROLIX, from a regulatory perspective, during its entire life cycle in the E.U. As of December 31, 2016, approximately $150$123.0 million in expenditures for ALPROLIX, may benet of the $10.0 million escrow payment and other royalty adjustments as described in the table and its footnote (3) below, are reimbursable to us by Sobi under the collaboration agreement ifdue to Sobi's election to assume final development and commercialization of ALPROLIX in the Sobi should exercise its option rightTerritory, which is the Opt-In Consideration for ALPROLIX. This reimbursement will be recognized by us as royalty revenue in proportion to collaboration revenues, over a ten-year period, consistent with respect to ALPROLIX. the initial patent term of the product.
The escrow payment made with respect toOpt-In Consideration for each product will be applied to the amount of the Opt-In Consideration to be reimbursedpaid by Sobi. To effect Sobi’s reimbursement to us for the Opt-In Consideration exceeding the escrowSobi using a cross-royalty cash payment for the applicable product, the cross-royalty structure for direct sales in each company’s respective territories will be adjusted untilas an adjustment to the Opt-In Consideration is paid in full (the Reimbursement Period). The mechanism for reimbursement is outlinedBase Rate in the table below.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


Under the collaboration agreement, amountscash payments are payable as follows:
     
Rates should Sobi exercise
its option right(3)
Royalty and Net Revenue Share Rates:Method 
Rate prior to 1st
commercial sale in
the Sobi Territory:
 
Base Rate following
1st commercial sale in
the Sobi Territory:
 
Rate during the
Reimbursement
Period:
Sobi rate to Biogen Idec on net sales in the Sobi TerritoryRoyalty N/A 10 to 12% 
Base Rate
plus 5%
Biogen Idec rate to Sobi on net sales in the Biogen Idec North America TerritoryRoyalty 2% 10 to 12% 
Base Rate
less 5%
Biogen Idec rate to Sobi on net sales in the Biogen Idec Direct TerritoryRoyalty 2% 15 to 17% 
Base Rate
less 5%
Biogen Idec rate to Sobi on net revenue(1) 
from the Biogen Idec Distributor Territory(2)
Net
Revenue
Share
 10% 50% 
Base Rate
less 15%
Rates post Sobi Opt-In(3)
Royalty and Net Revenue Share Rates:Method
Base Rate following
1st commercial sale in
the Sobi Territory:
Rate during the
Reimbursement
Period:
Sobi rate to Biogen on net sales in the Sobi TerritoryRoyalty12%Base Rate
plus 5%
Biogen rate to Sobi on net sales in the Biogen North America TerritoryRoyalty12%Base Rate
less 5%
Biogen rate to Sobi on net sales in the Biogen Direct TerritoryRoyalty17%Base Rate
less 5%
Biogen rate to Sobi on net revenue(1)
from the Biogen Distributor Territory(2)
Net
Revenue
Share
50%Base Rate
less 15%
(1)Net revenue represents Biogen Idec’sBiogen’s pre-tax receipts from third-party distributors, less expenses incurred by Biogen Idec in the conduct of commercialization activities supporting the distributor activities.
(2)The Biogen Idec Distributor Territory represents Biogen Idec territories where sales are derived utilizing a third-party distributor.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(3)A credit will be issued to Sobi against its reimbursement of the Opt-in Consideration for each product in an amount equal to the difference in the rate paid by Biogen Idec to Sobi on sales in the Biogen Idec territories for certain periods prior to the first commercial sale in the Sobi Territory versus the rate that otherwise would have been payable on such sales.
We are recording revenue at the effective royalty rate expected over the term of the agreement of approximately 14% and recording cost of sales at the effective royalty rate expected over the term of the agreement of approximately 11%.
If the reimbursement of the Opt-in Consideration has not been achieved within six years of the first commercial sale of such product, we maintain the right to require Sobi to pay any remaining balances due to us within 90 days of the six yearsix-year anniversary date of the first commercial sale.
Should Sobi not exercise its option right with respect to ALPROLIX or should Sobi terminateFollowing the spin-off of our hemophilia business, this collaboration agreement with respect Sobi will continue with Bioverativ, an independent public company. For additional information about the spin-off, please see Note 1, Summary of Significant Accounting Policies and Note 26, Subsequent Events to one or both products, we will obtain full worldwide development and commercialization rights for such affected products and we will be obligated to pay royalties to Sobi subject to separate terms, as defined in the collaboration agreement. In addition, if EMA approval for any product is not granted within 18 months of the applicable EMA filing date, Sobi shall have the right to require that the escrow payment be refunded and revoke its option right for such product.these consolidated financial statements.
AbbVie Biotherapeutics, Inc.
We have a collaboration agreement with AbbVie Biotherapeutics, Inc., a subsidiary of AbbVie, Inc. (AbbVie) aimed at advancing the development and commercialization of ZINBRYTA in MS. Under the agreement, development and commercialization costs and profits in North America and the E.U. are shared equally and we are responsible for the manufacture of ZINBRYTA.
Based upon our current development plans, we may incur up to an additional $60.0 million of payments upon achievement of development and commercial milestones related to the development of ZINBRYTA, of which $16.0 million will be due upon filing with the FDA and EMA.
A summary of activity related to this collaboration is as follows:
 
For the Years Ended
December 31,
(In millions)2014 2013 2012
Total development expense incurred by the collaboration$117.8
 $133.4
 $128.0
Biogen Idec’s share of development expense reflected within our consolidated statements of income$67.4
 $71.0
 $65.6

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


IsisIonis Pharmaceuticals, Inc.
Long-Term Strategic Research Collaboration
In September 2013 we entered into a six yearsix-year research collaboration with Ionis, formerly known as Isis Pharmaceuticals Inc. (Isis) under which both companies collaborate to perform discovery level research and then develop and commercialize antisense or other therapeutics for the treatment of neurological disorders. Under the collaboration, IsisIonis will perform research on a set of neurological targets identified within the agreement. Once the research has reached a specific stage of development, we will make the determination whether antisense is the preferred approach to develop a therapeutic candidate or whether another modality is preferred. If antisense is selected, IsisIonis will continue development and identify a product candidate. If another modality is used, we will assume the responsibility for identifying a product candidate and developing it.
Under the terms of this agreement, we paid IsisIonis an upfront amount of $100.0 million. Of this payment, we recorded prepaid research and discovery services of approximately $25.0 million, representing the value of the IsisIonis full time equivalent employee resources which are required by the collaboration to provide research and discovery services to us over the next six years.term. The remaining $75.0 million of the upfront payment was recorded as research and development expense in the third quarter of 2013, the period in which we entered into the collaboration, as it representsrepresented the purchase of intellectual property that hashad not reached technological feasibility.
IsisIonis is also eligible to receive milestone payments, license fees and royalty payments for all product candidates developed through this collaboration, with the specific amount dependent upon the modality of the product candidate advanced by us. During the years ending December 31, 2016, 2015 and 2014,, we made paymentstriggered milestones of $5.5 million, $20.0 million to Isisand $20.0 million, respectively, related to the advancement of ISIS-BIIB3IONIS-SOD1Rxto treat a neurodegenerative disease. for the treatment of ALS and other neurological targets identified.
For non-ALS antisense product candidates, IsisIonis will be responsible for global development through the completion of a Phase 2 trial and we will provide advice on the clinical trial design and regulatory strategy. For ALS antisense product candidates, we are responsible for global development, clinical trial design and regulatory strategy. We have an option to license a product candidate until completion of the Phase 2 trial. If we exercise our option, we will pay IsisIonis up to a $70.0 million license fee and assume global development, regulatory and commercialization responsibilities. IsisIonis could receive additional milestone payments upon the achievement of certain regulatory milestones of up to $130.0 million, plus additional amounts related to the cost of clinical trials conducted by IsisIonis under the collaboration, and royalties on future sales if we successfully develop the product candidate after option exercise.   
For product candidates using a different modality, we will be responsible for global development through all stages and will owe Isispay Ionis up to $90.0 million upon the achievement of certain regulatory milestones.milestones and royalties on future sales if we successfully develop the product candidate.

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Product Collaborations
In December, June and January 2012 we entered into three separate exclusive worldwide option and collaboration agreements with Isis Pharmaceuticals, Inc. (Isis)Ionis under which both companies will develop and commercialize SPINRAZA (nusinersen) for the treatment of SMA, antisense therapeutics for up to three gene targets Isis’ product candidatesand IONIS-DMPKRX for the treatment of myotonic dystrophy type 1 (DM1), respectively.
SPINRAZA (nusinersen)
In January 2012 we entered into an exclusive worldwide option and collaboration agreement with Ionis under which both companies will develop and commercialize the antisense investigational drug candidate, ISIS-SMNRxSPINRAZA, for the treatment of spinal muscular atrophy (SMA), respectively.SMA. Under the terms of this agreement, we paid Ionis $29.0 million as an upfront payment. During 2014 we amended the agreement to adjust the amount of potential additional payments and terms of the exercise of our opt-in right to license SPINRAZA, which included providing for additional opt-in scenarios, based on the filing or acceptance of a new drug application (NDA) or marketing authorization application with the FDA or EMA. Consistent with the initial agreement, Ionis remained responsible for conducting the pivotal/Phase 3 trials and we provided input on the clinical trial design and regulatory strategy for the development of SPINRAZA.
During 2016, 2015 and 2014, we triggered clinical trial payments of $35.3 million, $42.8 million and $57.3 million, respectively, related to the advancement of the program.
In August 2016 we and Ionis announced that SPINRAZA met the primary endpoint for the interim analysis of the Phase 3 trial evaluating SPINRAZA in infantile-onset SMA. In November 2016 we and Ionis announced that SPINRAZA met the primary endpoint for the interim analysis of the Phase 3 trial evaluating SPINRAZA in later-onset SMA. During the third quarter of 2016 we exercised our option to develop and commercialize SPINRAZA and paid Ionis a $75.0 million license fee in connection with the option exercise. This amount was recognized as research and development expense in our consolidated statements of income. In December 2016 SPINRAZA was approved by the FDA for the treatment of SMA in pediatric and adult patients in the U.S. During the fourth quarter of 2016 we accrued a $60.0 million milestone payment due to Ionis for the approval of SPINRAZA in the U.S. This amount was capitalized in intangible assets, net in our consolidated balance sheets.
During the years ending December 31, 2016, 2015 and 2014, $257.8 million, $74.9 million and $27.7 million, respectively, were reflected in research and development expense in our consolidated statements of income related to the advancement of the program.
We may pay Ionis up to approximately $90.0 million in additional milestone payments upon the achievement of certain regulatory milestones as well as a royalty rate in the mid-teens on future sales of SPINRAZA.
Antisense Therapeutics
Under the terms of the December 2012 agreement forrelating to the development and commercialization of up to three gene targets we provided IsisIonis with an upfront payment of $30.0$30.0 million and willagreed to make potential additional payments, prior to licensing, of up to $10.0$10.0 million based on the development of the selected product candidate as well as a mark-up of the cost estimate of the Phase 1 and Phase 2 trials. IsisDuring 2015 we triggered a $10.0 million milestone payment. Ionis will be responsible for global development of any product candidate through the completion of a Phase 2 trial and we will provide advice on the clinical trial design and regulatory strategy. We have an option to license the product candidate until completion of the Phase 2 trial. If we exercise our option, we will pay IsisIonis up to a $70.0$70.0 million license fee and assume global development, regulatory and commercialization responsibilities. IsisIonis could receive up to another $130.0$130.0 million in milestone payments upon the achievement of certain regulatory milestones as well as royalties on future sales if we successfully develop the product candidate after option exercise.

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ISIS-DMPKIONIS-DMPKRx 
Under the terms of the June 2012 agreement for the DM1 candidate, we provided IsisIonis with an upfront payment of $12.0$12.0 million and willagreed to make potential additional payments, prior to licensing, of up to $59.0$59.0 million based on the development of the selected product candidate. During 2014 and 2013, we made payments of $14.0 million and $10.0 million, respectively, to Isis related to the selection and advancement of ISIS-DMPKRx to treat DM1. Isis will be responsible for global development of any product candidate through the completion of a Phase 2 trial and we will provide advice on the clinical trial design and regulatory strategy. We also have an option to license the product candidate until completion of the Phase 2 trial. If we exercise our option, we will pay Isis up to a $70.0 million license fee and assume global development, regulatory and commercialization responsibilities. Isis could receive up to another $130.0 million in milestone payments upon the achievement of certain regulatory milestones as well as royalties on future sales if we successfully develop the product candidate after option exercise.
During the years ending December 31, 2014, 2013 and 2012, $10.9 million, $11.2 million and $22.0 million, respectively, were reflected within our consolidated statements of income.
ISIS-SMNRx
Under the terms of the January 2012 agreement for the antisense investigation drug, ISIS-SMNRx, we paid Isis $29.0 million as an upfront payment.
During 2014,2015 we amended the agreement to adjust the amount of potential additional payments and terms of the exercise of our opt-in rightby an additional $4.2 million due to license ISIS-SMNRx. Consistent with the initial agreement, Isis remains responsible for conducting the pivotal/Phase 3 trials. We are providing input onchanges in the clinical trial design and regulatory strategy fordesign.

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During 2016 we terminated the development of ISIS-SMNthe IONIS-DMPKRx. During 2014, we made clinical trial payments of $57.3 millionproduct candidate to Isis relatedtreat DM1 and returned the product to the advancement of the program. We are recognizing these payments as research and development expenses as the trial costs are incurred.
We may exercise our opt-in right upon completion of and data review of the first successful Phase 2/3 trial or completion of both Phase 2/3 trials. An amendment in December 2014 provided for additional opt-in scenarios, based on the filing or the acceptance of a new drug application or marketing authorization application with the FDA or EMA. Under the amended collaboration agreement, we may pay Isis up to approximately $325.0 million in a license fee and payments, including $100.0 million in payments associated with the clinical development of ISIS-SMNRx prior to licensing, a license fee and $150.0 million in milestone payments upon the achievement of certain regulatory milestones as well as royalties on future sales of ISIS-SMNRx if we successfully develop ISIS-SMNRx after option exercise.
Ionis. During the years ending December 31, 20142016, 20132015 and 20122014, $3.1 million, $27.7 million, $13.6$9.0 million and $39.6$10.9 million, respectively, were reflected withinin research and development expense in our consolidated statements of income.
Eisai Co., Ltd.
BAN2401 and E2609 Collaboration
OnIn March 4, 2014 we entered into a collaboration agreement with Eisai Co., Ltd. (Eisai) (Eisai Collaboration Agreement) to jointly develop and commercialize two Eisai product candidates for the treatment of Alzheimer’s disease, BAN2401, a monoclonal antibody that targets amyloid-beta aggregates, and E2609, a BACE inhibitor, (Eisai Collaboration Agreement).inhibitor. Under the Eisai Collaboration Agreement, Eisai serves as the global operational and regulatory lead for both compounds and all costs, including research, development, sales and marketing expenses, will be shared equally by us and Eisai. Following marketing approval in major markets, such as the U.S., the E.U. and Japan, we will co-promote BAN2401 and E2609 with Eisai and share profits equally. In smaller markets, Eisai will distribute these products and pay us a royalty. The Eisai Collaboration Agreement also provides the parties with certain rights and obligations in the event of a change in control of either party.
The Eisai Collaboration Agreement also provides Eisai an option to jointly develop and commercialize BIIB037,aducanumab, our anti-amyloid beta antibody candidate for Alzheimer’s disease (BIIB037(Aducanumab Option) and an option to jointly develop and commercialize one of our anti-tau monoclonal antibodies (Anti-Tau Option). Upon exercise of each of the BIIB037Aducanumab Option and the Anti-Tau Option, we will execute a separate collaboration agreement with Eisai on terms and conditions that mirror the Eisai Collaboration Agreement.
BIIB037Aducanumab Option
Eisai may exercise the BIIB037Aducanumab Option after either (i) completion of both the current Phase 1b clinical trial for BIIB037aducanumab and the current Phase 2 clinical trial for BAN2401 (Post-Phase 2 BIIIB037Aducanumab Option), or (ii) completion of the Phase 3 clinical trial for BIIB037aducanumab (Post-Phase 3 BIIB037Aducanumab Option) under certain conditions.

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The consideration we will receive if Eisai exercises the Post-Phase 2 BIIB037Aducanumab Option depends on the development status of BAN2401. If BAN2401 is then determined to advance to Phase 3, we will be entitled to receive a single payment from Eisai upon regulatory approval of BIIB037aducanumab and we will no longer be required to pay Eisai any milestone payments for products containing BAN2401 under the Eisai Collaboration Agreement. If the development of BAN2401 has instead been terminated, we will receive development and commercial milestone payments from Eisai (Post-Phase 2 BIIB037Aducanumab Milestone Payments). If Eisai does not exercise its Post-Phase 2 BIIB037Aducanumab Option, we may elect to terminate the Eisai Collaboration Agreement with respect to BAN2401 but, under certain conditions, will have the option to reinstate the Eisai Collaboration Agreement after completion of a BAN2401 Phase 3 clinical trial.
If Eisai exercises its Post-Phase 3 BIIB037Aducanumab Option, Eisai will be required to pay us all Phase 3 development and commercialization costs plus a mark-up and an amount equal to any unpaid Post-Phase 2 BIIB037Aducanumab Milestone Payments that would have been payable if Eisai had exercised its Post-Phase 2 BIIB037Aducanumab Option.
Anti-Tau Option
Eisai may exercise the Anti-Tau Option after completion of the Phase 1 clinical trial of such anti-tau monoclonal antibody. If Eisai exercises its Anti-Tau Option, we will receive an upfront payment from Eisai and will be entitled to additional development and commercial milestone payments.
Upon the effective date of the Eisai Collaboration Agreement, we paid Eisai $100.0 million and recorded $17.7 million, reflecting the fair value of the options granted under the Eisai Collaboration Agreement, both of which were classified as research and development expense withinin our consolidated statements of income. During the second quarter of 2014 Eisai exercised its option under the Eisai Collaboration Agreement to expand the joint development and commercialization activities to include Japan. Upon such exercise, we paid Eisai an additional $35.0 million, and recorded $21.6 million in the second quarter of 2014 as research and development expense withinin our consolidated statements of income, which represented the difference between the payment made upon exercise of the option and the fair value of that option recorded as research and development expense upon closing of the agreement in the first quarter of 2014. During the fourth quarter of 2016 we recognized a $50.0 million milestone payment related to the initiation of a phase 3

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trial for E2609, which is included in research and development expense in our consolidated statements of income. We could pay Eisai up to an additional $1.0 billion under the Eisai Collaboration Agreement based on the future achievement of certain development, regulatory and commercial milestones.
A summary of activityIn addition to our arrangements with Eisai, Neurimmune is entitled to milestone and royalty payments related to this collaboration is as follows:
 
For the Years Ended
December 31,
(In millions)2014 2013 2012
Total development expense incurred by the collaboration$57.5
 $
 $
Biogen Idec’s share of development expense, excluding upfront and milestone payments, reflected within our consolidated statements of income$29.1
 $
 $
For additional information related to our obligations for the payment of milestones and royalties related to our development and commercialization of BIIB037aducanumab and certain anti-tau antibodies, please read aboutantibodies. For additional information regarding our relationshipagreement with Neurimmune, inplease see Note 19,18, Investments in Variable Interest Entities to these consolidated financial statements.
A summary of activity related to our collaboration with Eisai is as follows:
 
For the Years Ended
December 31,
(In millions)2016 2015 2014
Total development expense incurred by the collaboration$95.1
 $84.1
 $57.5
Biogen’s share of development expense, excluding upfront and milestone payments, reflected in our consolidated statements of income$50.5
 $40.4
 $29.1
Applied Genetic Technologies Corporation
In July 2015 we announced a collaboration and license agreement to develop gene-based therapies for multiple ophthalmic diseases with Applied Genetic Technologies Corporation (AGTC). The collaboration will focus on the development of a portfolio of AGTC’s therapeutic programs, including both a clinical-stage candidate for X-linked Retinoschisis (XLRS) and a pre-clinical candidate for the treatment of X-Linked Retinitis Pigmentosa (XLRP). The agreement also includes options for early stage discovery programs in two ophthalmic diseases and one non-ophthalmic condition, as well as an equity investment in AGTC.
During the third quarter of 2015 we made an upfront payment of $124.0 million, which included a $30.0 million equity investment in AGTC, prepaid research and development expenditures of $58.4 million and total licensing and other fees of $35.6 million. The $58.4 million of prepaid research and development expenditures were recorded in investments and other assets in our consolidated balance sheets and will be expensed as the services are provided. During 2015 we recorded $54.5 million as research and development expense associated with AGTC in our consolidated statements of income, including the $35.6 million total licensing and other fees, $6.5 million in research and development services, a $7.5 million premium on our equity investment and a $5.0 million clinical development milestone related to XLRS. During 2016 we recorded $26.5 million in research and development services in research and development expense in our consolidated statements of income.
AGTC is eligible to receive development, regulatory and commercial milestone payments aggregating in excess of $1.1 billion, which includes up to $472.5 million collectively for the two lead programs and up to $592.5 million across the discovery programs. AGTC is also eligible to receive royalties in the mid-single digit to mid-teen percentages of annual net sales.
We were granted worldwide commercialization rights for the XLRS and XLRP programs. AGTC has an option to share development costs and profits after the initial clinical trial data are available, and an option to co-promote the second of these products to be approved in the U.S. AGTC will lead the clinical development programs of XLRS through product approval and of XLRP through the completion of first-in-human trials. We will support the clinical development costs, subject to certain conditions, following the first-in-human study for XLRS and IND-enabling studies for XLRP. Under the manufacturing license, we have received an exclusive license to use AGTC’s proprietary technology platform to make AAV vectors for up to six genes, three of which are in AGTC’s discretion, in exchange for payment of milestones and royalties.
University of Pennsylvania
In May 2016 we entered into a collaboration and alliance with the University of Pennsylvania (UPenn) to advance gene therapy and gene editing technologies. The collaboration will primarily focus on the development of therapeutic approaches that target the eye, skeletal muscle and the central nervous system. The alliance is also expected to focus on the research and validation of next-generation gene transfer technology using adeno-associated virus gene delivery vectors and exploring the expanded use of genome editing technology as a potential therapeutic platform.

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During the second quarter of 2016 we paid Penn an upfront fee of $20.0 million, which was recorded as research and development expense in our consolidated statements of income, and prepaid research and development expenditures of $15.0 million, which was recorded in investments and other assets in our consolidated balance sheets. We also expect to fund an additional $47.5 million in the aggregate in research and development costs extending over the next three to five years in seven preclinical research and development programs, as well as the exploration of genome-editing technology.
If all of the collaborations programs are successful and we exercise all of our options under the Penn collaboration and alliance, we may be required to make future payments of over $2.0 billion in research funding, options and milestone payments, in addition to royalties payable on net sales of products.
Sangamo BioSciences, Inc.
OnIn February 22, 2014 we completed an exclusive worldwide research, development and commercialization collaboration and license agreement with Sangamo BioSciences, Inc. (Sangamo) under which both companies will develop and commercialize product candidates for the treatment of two inherited blood disorders, sickle cell disease and beta-thalassemia. The collaboration is currently in the research stage of development.
Under the terms of the agreement, we paid Sangamo an upfront payment of $20.0 million in cash, with additional payments of up to approximately $300.0 million based on the achievement of certain development, regulatory and commercial milestones, plus royalties based on sales. We recorded the $20.0 million upfront payment as research and development expense.expense in our consolidated statements of income. Under this arrangement, Sangamo will be responsible for identifying a product candidate for the treatment of beta-thalassemia and advancing that candidate through a completed Phase 1 human clinical trial, at which point we would assume responsibility for development. We will jointly develop a sickle cell disease candidate through the potential filing of an investigative new drug application, after which we would assume clinical responsibilities. We will lead the global development and commercialization efforts and Sangamo will have the option to assume co-promotion responsibilities in the U.S.
During the year ended years ending December 31, 2016, 2015 and 2014,, $13.4 million, $13.6 million and $28.9 million, respectively, of expense was reflected withinin our consolidated statements of income.
Following the spin-off of our hemophilia business, this collaboration and license agreement with Sangamo will continue with Bioverativ, an independent public company. For additional information about the spin-off, please see Note 1, Summary of Significant Accounting Policies and Note 26, Subsequent Events to these consolidated financial statements.

Mitsubishi Tanabe Pharma Corporation
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BIOGEN IDEC INC. AND SUBSIDIARIESDuring the third quarter of 2016 we discontinued our development of amiselimod. We expect to formally terminate the agreement and return the program to MTPC in the first quarter of 2017. We will have no further license to or continuing involvement in the development of this compound. For the year ended December 31, 2016, $22.8 million was reflected in research and development expense in our consolidated statements of income.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


Other Research and Discovery Arrangements
During the yearyears ended December 31, 2016, 2015 and 2014,, we entered into several research, discovery and other related arrangements that resulted in $10.3 million, $9.7 million and $40.0 million, respectively, recorded as research and development expense withinin our consolidated statements of income and $3.6 million recorded as prepaid research and development assets within our consolidated balance sheets.
During the year ended December 31, 2013, we entered into research, discovery and other arrangements that resulted in $35.0 million recorded as investments and other assets within our consolidated balance sheets and $4.0 million recorded as research and development expense within our consolidated statements of income.
These additional arrangements include the potential for future milestone payments based on clinical and commercial development over a period of several years.

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Samsung Bioepis
Joint Venture Agreement
In February 2012 we entered into a joint venture agreement with Samsung BioLogics Co. Ltd. (Samsung Biologics), establishing an entity, Samsung Bioepis, to develop, manufacture and market biosimilar pharmaceuticals. Samsung Biologics contributed 280.5 billion South Korean won (approximately $250.0 million)$250.0 million) for an 85% stake in Samsung Bioepis and we contributed approximately 49.5 billion South Korean won (approximately $45.0 million)$45.0 million) for the remaining 15% ownership interest. Our investment is limited to this contribution asUnder the joint venture agreement, we have no obligation to provide any additional funding. As of December 31, 2014,funding and our ownership interest has decreasedmay be diluted due to financings in which we do not participate. As of December 31, 2016, our ownership interest is approximately 10% as Samsung Bioepis has secured6.5%, which reflects the effect of additional equity financing from Samsung Biologics andfinancings in which we havedid not participated in such financing.participate. We maintain an option to purchase additional stock in Samsung Bioepis that would allow us to increase our ownership percentage up to 49.9%. The exercise of this option is within our control and is based on paying for 49.9% of the total investment made by Samsung Biologics into Samsung Bioepis in excess of what we have already contributed duringunder the agreement plus interest.
On December 17, 2013,a rate that will represent their return on capital. If we do not exercise this option by a date in 2018 determined pursuant to our rights under the joint venture agreement, withthis option will expire and Samsung Biologics we entered into an agreement withwill have the right to purchase all of Samsung Bioepis to commercialize anti-TNF biosimilar product candidates in Europe and in the case of one anti-TNF biosimilar, Japan. Under the terms of this agreement, we paid $36.0 million, which was recorded as a research and development expense within our consolidated statements of income as the programs they relate to had not achieved regulatory approval. Samsung Bioepis is eligible to receive an additional $85.0 million in additional milestones related to clinical development and regulatory approval of the product candidates. Upon commercialization, there will be a 50% profit share with Samsung Bioepis.Bioepis’ shares then held by us.
Samsung Biologics has the power to direct the activities of Samsung Bioepis which will most significantly and directly impact its economic performance. We account for this investment under the equity method of accounting as we maintain the ability to exercise significant influence over Samsung Bioepis through a presence on the entity’s Board of Directors and our contractual relationship. Under the equity method, we recordrecorded our original investment at cost and subsequently adjust the carrying value of our investmentsinvestment for our share of equity in the entity’s income or losses according to our percentage of ownership. If losses accumulate, we will record our share of losses until our investment has been fully depleted. Once our investment has been fully depleted, we will recognize additional losses only if we provide or are required to provide additional funding. As of December 31, 2014 and 2013, the carrying value of our investment in Samsung Bioepis totaled 9.1 billion and 25.2 billion South Korean won (approximately $8.6 million and $23.9 million), respectively, which is classified as a component of investments and other assets within our consolidated balance sheets. We recognize our share of the results of operations related to our investment in Samsung Bioepis one quarter in arrears when the results of the entity become available, which is reflected as equity in loss of investee, net of tax withinin our consolidated statements of income. During the years ended December 31, 2014, 20132015 and 2012,2014, we recognized a loss on our investment of $12.5 million and $15.1 million, $17.2respectively. During 2015, as our share of losses exceeded the carrying value of our investment, we suspended recognizing additional losses and will continue to do so unless we commit to providing additional funding.
Commercial Agreement
In December 2013 pursuant to our rights under the joint venture agreement with Samsung Biologics, we entered into an agreement with Samsung Bioepis to commercialize, over a 10-year term, three anti-tumor necrosis factor (TNF) biosimilar product candidates in Europe and in the case of one anti-TNF biosimilar, Japan. Under the terms of this agreement, we have made total upfront and clinical development milestone payments of $46.0 million, all of which have been recorded as research and $4.5development expense in our consolidated statements of income as the programs they relate to had not achieved regulatory approval. We also agreed to make additional milestone payments of $25.0 million respectively.upon regulatory approval in the E.U. for each of the three anti-TNF biosimilar product candidates. During the year ended December 31, 2016, we paid $50.0 million in milestone payments, which have been capitalized in intangible assets, net in our consolidated balance sheets as BENEPALI received regulatory approval in the E.U. in January 2016 and FLIXABI received regulatory approval in the E.U. in May 2016. In July 2016 the EMA accepted Samsung Bioepis' MAA for SB5, an adalimumab biosimilar candidate referencing HUMIRA.
We began to recognize revenue on sales of BENEPALI in the E.U. in the first quarter of 2016 and FLIXABI in the E.U. in the third quarter of 2016. We reflect revenues on sales of BENEPALI and FLIXABI to third parties in product revenues, net in our consolidated statements of income and record the related cost of revenues and sales and marketing expenses in our consolidated statements of income to their respective line items when these costs are incurred. We share 50% of the profit or loss related to our commercial agreement with Samsung Bioepis. This profit sharing with Samsung Bioepis is recognized in collaboration profit (loss) sharing in our consolidated statements of income. For the year ended December 31, 2016, we recognized a net expense of $15.1 million related to the collaboration profit share.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Other Services

Simultaneous with the formation of Samsung Bioepis, we also entered into a license agreement, a technical development services agreement and a manufacturing agreement with Samsung Bioepis. Under the terms of the license agreement, we granted Samsung Bioepis an exclusive license to use, develop, manufacture and commercialize biosimilar products created by Samsung Bioepis using Biogen Idec product-specific technology. In exchange, we will receive single digit royalties on all biosimilar products developed and commercialized by Samsung Bioepis. Under the terms of the technical development services agreement, we provide Samsung Bioepis technical development and technology transfer services, which include, but are not limited to, cell culture development, purification process development, formulation development and analytical development. Under the terms of our manufacturing agreement, we manufacture clinical and commercial quantities of bulk drug substance of biosimilar products for Samsung Bioepis pursuant to contractual terms. Under limited circumstances, we may also supply Samsung Bioepis with quantities of drug product of biosimilar products for use in clinical trials through arrangements with third partythird-party contract manufacturers.
For the years ended December 31, 2014, 20132016, 2015 and 2012,2014, we recognized $58.5$20.2 million,, $43.1 $62.9 million and $13.3$58.5 million, respectively, in other revenues in relation to these services, which is reflected as a component of other revenues withinin our consolidated statementstatements of income.
20.    Litigation
We are currently involved in various claims and legal proceedings, including the matters described below. For information as to our accounting policies relating to claims and legal proceedings, including use of estimates and contingencies, please read Note 1, Summary of Significant Accounting Policies to these consolidated financial statements.
21.  Litigation
’755With respect to some loss contingencies, an estimate of the possible loss or range of loss cannot be made until management has further information, including, for example, (i) which claims, if any, will survive dispositive motion practice; (ii) information to be obtained through discovery; (iii) information as to the parties' damages claims and supporting evidence; (iv) the parties’ legal theories; and (v) the parties' settlement positions.
The claims and legal proceedings in which we are involved also include challenges to the scope, validity or enforceability of the patents relating to our products, pipeline or processes, and challenges to the scope, validity or enforceability of the patents held by others. These include claims by third parties that we infringe their patents. An adverse outcome in any of these proceedings could result in one or more of the following and have a material impact on our business or consolidated results of operations and financial position: (i) loss of patent protection; (ii) inability to continue to engage in certain activities; and (iii) payment of significant damages, royalties, penalties and/or license fees to third parties.
Loss Contingencies
Forward Pharma German Patent Litigation
On May 28, 2010, Biogen Idec MA Inc. (BIMA)November 18, 2014, Forward Pharma A/S (Forward Pharma) filed a complaint in the U.S. District Court for the District of New Jersey alleging infringement by Bayer Healthcare Pharmaceuticals Inc. (Bayer) (manufacturer, marketer and seller of BETASERON and manufacturer of EXTAVIA), EMD Serono, Inc. (manufacturer, marketer and seller of REBIF), Pfizer, Inc. (co-marketer of REBIF), and Novartis Pharmaceuticals Corp. (marketer and seller of EXTAVIA) of our U.S. Patent No. 7,588,755 (’755 Patent), which claims the use of interferon beta for immunomodulation or treating a viral condition, viral disease, cancers or tumors. The complaint seeks monetary damages, including lost profits and royalties. Bayer had previously filed a complaintsuit against us in the same court, onRegional Court of Düsseldorf, Germany (the German Infringement Litigation) alleging that TECFIDERA infringes German Utility Model DE 20 2005 022 112 U1 (the utility model), which was issued in April 2014 and expired in October 2015. Forward Pharma subsequently extended its allegations to assert that TECFIDERA infringes Forward Pharma's European Patent No. 2,801,355 (the '355 patent), which was issued in May 27, 2010, seeking2015 and expires in October 2025. We have entered a declaratory judgmentsettlement and license agreement with Forward Pharma that it does not infringe the ’755 Patentwill provide us an irrevocable license to all intellectual property owned by Forward Pharma and that the patent is invalid, and seeking monetary reliefresult in the formtermination of attorneys' fees, coststhe German Infringement Litigation. For more information on the settlement and expenses. The court haslicense agreement please read Note 21, Commitments and Contingencies to these consolidated the two lawsuits, and we refer to the two actions as the “Consolidated ’755 Patent Actions.”financial statements.
Bayer, Pfizer, Novartis and EMD Serono have all filed counterclaims in the Consolidated ’755 Patent Actions seeking declaratory judgments
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Italian National Medicines Agency
In the fourth quarter of 2011 Biogen Idec Italia SRL received notice from the Italian National Medicines Agency (Agenzia Italiana del Farmaco or AIFA) that sales of TYSABRI after mid-February 2009 exceeded a reimbursement limit established pursuant to a Price Determination Resolution (Price Resolution) granted by AIFA in December 2006. On December 23, 2011,January 12, 2012, we filed an appeal in the Regional Administrative Tribunal of Lazio (Il Tribunale Amministrativo Regionale per il Lazio) in Rome, Italy seeking a ruling that the reimbursement limit in the Price Resolution should apply as written to only “the first 24 months” of TYSABRI sales, which ended in mid-February 2009. The appeal is still pending. Earlier this yearIn June 2014 AIFA approved a resolution affirming that that there is no reimbursement limit from and after February 2013. AIFAIn January 2017 we negotiated an agreement in principle with AIFA's Price and Biogen Idec Italia SRL are discussing a possible resolutionReimbursement Committee to settle all of AIFA's existing claims relating to sales of TYSABRI in excess of the reimbursement limit for the periodperiods from mid-FebruaryFebruary 2009 through January 2013.2013 for an aggregate repayment of EUR37.4 million. The agreement is subject to ratification by AIFA.
Average Manufacturer PriceFor additional information regarding this matter, please read Note 17, Other Consolidated Financial Statement Detail to these consolidated financial statements.
Qui Tam Litigation
On SeptemberJuly 6, 2011, we and several other pharmaceutical companies were served with2015, a complaint originallyqui tam action filed under seal on October 28, 2008 inbehalf of the United States and certain states were unsealed by the U.S. District Court for the Eastern District of Pennsylvania by Ronald Streck on behalfMassachusetts. The action alleges sales and promotional activities in violation of himselfthe federal False Claims Act and thestate law counterparts, and seeks single and treble damages, civil penalties, interest, attorneys’ fees and costs. Our motion to dismiss is pending. The United States 24 stateshas not made an intervention decision. An estimate of the possible loss or range of loss cannot be made at this time.
Securities Litigation
We and certain current and former officers are defendants in In re Biogen Inc. Securities Litigation, filed by a shareholder on August 18, 2015 in the U.S. District Court for the District of Columbia (collectivelyMassachusetts. The amended complaint alleges violations of federal securities laws under 15 U.S.C. §78j(b) and §78t(a) and 17 C.F.R. §240.10b-5. The lead plaintiff sought a declaration of the “States”).action as a class action, certification as a representative of the class and its counsel as class counsel, and an award of damages, interest and attorneys' fees. On July 1, 2016, the U.S. District Court dismissed the case and in September 2016 denied the plaintiff's motion to vacate the order of dismissal. The plaintiff has appealed. An estimate of the possible loss or range of loss cannot be made at this time.
We and certain current and former officers are also defendants in an action filed by another shareholder on October 20, 2016 in the U.S. District Court for the District of Massachusetts, related to the matter described above. The complaint alleges thatviolations of federal securities laws under 15 U.S.C. §78j(b) and §78t(a) and 17 C.F.R. §240.10b-5 and seeks a declaration of the action as a class action and an award of damages, interest and attorney's fees. An estimate of the possible loss or range of loss cannot be made at this time.
Other Matters
Interference Proceeding with Forward Pharma
In April 2015 the U.S. Patent and Trademark Office (USPTO) declared an interference between Forward Pharma’s pending U.S. Patent Application No. 11/576,871 and our U.S. Patent No. 8,399,514 (the '514 patent). The '514 patent includes claims covering the treatment of multiple sclerosis with 480 mg of dimethyl fumarate as provided for in our TECFIDERA label. We are awaiting a decision in this matter.
Inter Partes Review Proceeding
On March 22, 2016, the USPTO instituted inter partes review of the '514 patent on the petition of the Coalition for Affordable Drugs V LLC, an entity associated with a hedge fund. We are awaiting a decision in this matter.
On April 18, 2016, Swiss Pharma International AG filed petitions in the USPTO for inter partes review of U.S. Patent Nos. 8,349,321 and 8,900,577, relating to specific formulations of natalizumab (TYSABRI), and U.S. Patent No. 8,815,236, relating to methods for treating MS and Crohn's disease using specific formulations of natalizumab (TYSABRI). In October 2016 the USPTO declined to institute proceedings under all three petitions. Swiss Pharma filed requests for rehearing, which are pending.

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

European Patent Office Oppositions
In June 2016 the European Patent Office issued a written decision confirming its earlier revocation of our European patent number 2 137 537 (the '537 patent), which we have appealed. The '537 patent includes claims covering the treatment of MS with 480 mg of dimethyl fumarate as provided for in our TECFIDERA label.
Patent Revocation Matter
In December 2015 Swiss Pharma International AG brought an action in the Patents Court of the United Kingdom to revoke the UK counterpart of our European Patent Number 1 485 127 (“Administration of agents to treat inflammation”) (the '127 patent), which was issued in June 2011 and concerns administration of natalizumab (TYSABRI) to treat MS. The patent expires in February 2023. Subsequently, the same entity brought an actions in the District Court of The Hague (on January 11, 2016) and the German Patents Court (on March 3, 2016) to invalidate the Dutch and German counterparts of the '127 patent. In September 2016 we resolved the UK action by agreeing to revocation of the UK patent. A hearing has been scheduled in the Dutch action for early 2017 and the German action for early 2018.
'755 Patent Litigation
On May 28, 2010, Biogen MA Inc. (formerly Biogen Idec violatedMA Inc.) filed a complaint in the False Claims Act, 31 U.S.C. § 3729 et seq.U.S. District Court for the District of New Jersey alleging infringement by Bayer Healthcare Pharmaceuticals Inc. (Bayer) (manufacturer, marketer and local statutory counterparts by under reporting Average Manufacturer Price (AMP) informationseller of BETASERON and manufacturer of EXTAVIA), EMD Serono, Inc. (EMD Serono) (manufacturer, marketer and seller of REBIF), Pfizer Inc. (co-marketer of REBIF) and Novartis Pharmaceuticals Corp. (Novartis) (marketer and seller of EXTAVIA) of our U.S. Patent No. 7,588,755 ('755 Patent), which claims the use of interferon beta for immunomodulation or treating a viral condition, viral disease, cancers or tumors. The complaint seeks monetary damages, including lost profits and royalties. Bayer had previously filed a complaint against us in the same court, on May 27, 2010, seeking a declaratory judgment that it does not infringe the '755 Patent and that the patent is invalid, and seeking monetary relief in the form of attorneys' fees, costs and expenses. The court has consolidated the two lawsuits, and we refer to the Centerstwo actions as the “Consolidated '755 Patent Actions.”
Bayer, Pfizer, Novartis and EMD Serono have all filed counterclaims in the Consolidated '755 Patent Actions seeking declaratory judgments of patent invalidity and non-infringement, and seeking monetary relief in the form of costs and attorneys' fees, and EMD Serono and Bayer have each filed a counterclaim seeking a declaratory judgment that the '755 Patent is unenforceable based on alleged inequitable conduct. Bayer has also amended its complaint to seek such a declaration. Trial has been set for Medicare and Medicaid Services. The United States and the States have declined to intervene. We believe we have good and valid defenses. We have not formed an opinion that an unfavorable outcome under the remaining claims is either “probable” or “remote”. Trial is scheduled for the first half of 2016.September 2017.
Government Matters
We have learned that state and federal governmental authorities are investigating our sales and promotional practices and have received related subpoenas. We have alsoare cooperating with the government.
On March 4, 2016, we received a subpoena from the federal government for documents relating to our relationship with certain pharmacy benefit managers.non-profit organizations that provide assistance to patients taking drugs sold by Biogen. We are cooperating with the government.
On July 1, 2016, we received a civil investigative demand from the federal government for documents and information relating to our treatment of certain service agreements with wholesalers when calculating and reporting Average Manufacturer Prices in these matters.connection with the Medicaid Drug Rebate Program. We are cooperating with the government.
On December 5, 2016, we received a subpoena from the federal government for documents relating to government price reporting, rebate payments and Biogen's co-pay assistance programs for AVONEX, TECFIDERA, TYSABRI and PLEGRIDY. We are cooperating with the government.
On December 29, 2016, we received a civil investigative demand from the federal government for documents and information relating to our relationships with entities providing clinical education and reimbursement support services. We are cooperating with the government.

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BIOGEN IDEC INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


Qui Tam Litigation
In August, 2012, we learned that a relator, on behalf of the United States and certain states, filed a suit under seal on February 17, 2011 against us, Elan Corporation, plc, and Elan Pharmaceuticals, Inc. in the United States District Court for the Western District of Virginia. We have neither seen nor been served with the complaint, but understand that it was filed under the Federal False Claims Act.
Forward Pharma Litigation
On November 18, 2014 Forward Pharma A/S (“Forward Pharma”) filed suit against us in the Regional Court of Dusseldorf, Germany alleging that TECFIDERA infringes German Utility Model DE 20 2005 022 112 U1, which was registered on April 24, 2014, published on June 5, 2014 and expires in October 2015.
Forward Pharma seeks a declaration of infringement and a determination of damages. We believe that we have good and valid defenses to the complaint and will vigorously defend against it. We have not formed an opinion that an unfavorable outcome is either “probable” or “remote” and are unable to estimate the magnitude or range of any potential loss.
Product Liability and Other Legal Proceedings
We are also involved in product liability claims and other legal proceedings generally incidental to our normal business activities. While the outcome of any of these proceedings cannot be accurately predicted, we do not believe the ultimate resolution of any of these existing matters would have a material adverse effect on our business or financial condition.
22.Commitments and Contingencies
Leases
We rent laboratory21.    Commitments and office spaceContingencies
TECFIDERA Litigation Settlement and certain equipment under non-cancelable operating leases. These lease agreements contain various clauses for renewal at our optionLicense Agreement
In January 2017 we agreed to enter into a settlement and in certain cases, escalation clauses typically linkedlicense agreement with Forward Pharma that will provide us an irrevocable license to rates of inflation. Rental expense under these leases, net of amounts recognized in relation to exiting our Weston, Massachusetts facility, which terminate at various dates through 2028, amounted to $62.4 million in 2014. Rent expense was $56.1 million in 2013all intellectual property owned by Forward Pharma and $49.0 million in 2012. In addition to rent, the leases may require us to pay additional amounts for taxes, insurance, maintenance and other operating expenses.
As of December 31, 2014, minimum rental commitments under non-cancelable leases, net of income from subleases, for each of the next five years and total thereafter were as follows:
(In millions)2015 2016 2017 2018 2019 Thereafter Total
Minimum lease payments (1)$67.8
 $70.8
 $70.6
 $61.7
 $58.9
 $411.3
 $741.1
Less: income from subleases(5.6) (6.0) (6.0) (6.3) (6.3) (35.2) (65.4)
Net minimum lease payments$62.2
 $64.8
 $64.6
 $55.4
 $52.6
 $376.1
 $675.7
(1)As a result of our decision to relocate our corporate headquarters to Cambridge, Massachusetts, we vacated part of our Weston, Massachusetts facilityresults in the fourth quarter of 2013. We incurred a charge of $27.2 million in connection with this move. This charge represented our remaining lease obligation for the vacated portion of our Weston, Massachusetts facility, net of sublease income expected to be received. The term of our sublease to the vacated portion of our Weston, Massachusetts facility started in January 2014 and will continue through the remaining term of our lease agreement.
Under certain of our lease agreements, we are contractually obligated to return leased space to its original condition upon termination of the lease agreement. AtGerman Infringement Litigation. Under the inceptionterms of the settlement and license agreement with Forward Pharma, we have agreed to pay Forward Pharma $1.25 billion in cash. Under certain circumstances outlined in the agreement, we will pay Forward Pharma royalties on net sales of our products for the treatment of multiple sclerosis that are covered by a lease with such conditions,Forward Pharma patent and have dimethyl fumarate (“DMF”) as an active pharmaceutical ingredient.
During the fourth quarter of 2016 we record an asset retirement obligation liabilityrecognized a pre-tax charge of $454.8 million related to this matter. This amount represents the fair value of estimated royalties on our sales of TECFIDERA during the period April 2014 through December 31, 2016. When the cash payment is made following approval of the settlement and a corresponding capital asset in an amount equal tolicense agreement, we will recognize assets of $656.3 million and $138.9 million, reflecting the estimated fair value of the obligation. In subsequent periods, for each such lease,license acquired that is attributable to the U.S. and E.U., respectively. If Forward Pharma does not receive a patent in either the Interference Proceeding pending in the U.S. or the pending European Opposition Proceeding (which proceedings are defined in the settlement and license agreement), we record interest expensewould likely recognize an immediate impairment charge equal to accrete the asset retirement obligation liability to full value and depreciate each capitalized asset retirement obligation asset, both over the term of the associated lease agreement. Our asset retirement obligations werelicense that is attributable to that jurisdiction as additional litigation expense and we would not significant as of December 31, 2014be obligated to pay Forward Pharma royalties in such jurisdiction. If Forward Pharma receives a patent in either the U.S. Interference Proceeding or 2013.
Tax Related Obligations
We exclude liabilities pertaining to uncertain tax positions from our summary of contractual obligations asthe E.U. Opposition Proceeding, we cannot make a reliable estimate ofwould amortize the period of cash settlement with the respective taxing authorities. As of December 31, 2014, we have approximately $80.2 million of net liabilities associated with uncertain tax positions.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


Other Funding Commitments
As of December 31, 2014, we have several on-going clinical studies in various clinical trial stages. Our most significant clinical trial expenditures are to CROs. The contracts with CROs are generally cancellable, with notice, at our option. We have recorded accrued expenses of approximately $41.6 million on our consolidated balance sheet for expenditures incurred by CROs as of December 31, 2014. We have approximately $472.3 million in cancellable future commitments based on existing CRO contracts as of December 31, 2014.
Contingent Development, Regulatory and Commercial Milestone Payments
Based on our development plans as of December 31, 2014, we have committed to make potential future milestone payments to third parties of up to approximately $2.8 billion as part of our various collaborations, including licensing and development programs. Payments under these agreements generally become due and payable only upon achievement of certain development, regulatory or commercial milestones. Because the achievement of these milestones had not occurred as of December 31, 2014, such contingencies have not been recorded in our financial statements. Amountsassets related to contingent milestone payments are not considered contractual obligationsa license of intellectual property in the related jurisdiction utilizing an economic consumption model and we may be obligated to royalties on a country by country basis in Europe and other ex-U.S. markets.
For additional information with respect to the terms of this agreement, including potential royalties payable, please read the Settlement and License Agreement dated January 17, 2017, between Biogen Swiss Manufacturing GmbH, Biogen International Holding Ltd, Forward Pharma A/S and the other parties thereto which is filed as they are contingent onExhibit 10.41 to this 2016 Form 10-K. For additional information related to the successful achievement of certain development, regulatory approval and commercial milestones.ongoing Interference Proceeding with Forward Pharma in the U.S. or the European Office Opposition in the E.U., please read Note 20, Litigation to these consolidated financial statements.
TYSABRI Contingent Payments
On April 2,In 2013 we acquired from Elan full ownership of all remaining rights to TYSABRI from Elan that we did not already own or control. Under the terms of the acquisition agreement, we are obligated to make contingent payments to Elan of 18% on annual worldwide net sales up to $2.0 billion and 25% on annual worldwide net sales that exceed $2.0 billion. Royalty payments to Elan and other third parties are recognized as cost of sales withinin our consolidated statements of income. Elan was acquired by Perrigo Company plc (Perrigo) in December 2013. Following that acquisition, we began making these royalty payments to Perrigo.
Contingent Consideration related to Business Combinations
In connection with our purchase of the noncontrolling interests in our joint venture investments in Biogen Dompé SRL and Biogen Dompé Switzerland GmbH and our acquisitions of Convergence, Stromedix and Biogen Idec International Neuroscience GmbH (BIN) and Biogen Idec Hemophilia Inc. (BIH), we may pay upagreed to approximately $850 million in remaining milestonesmake additional payments based upon the achievement of certain milestone events. These milestones may not be achieved.
As the acquisitions of the noncontrolling interests in our joint venture investments and our acquisitions ofConvergence, Stromedix and BIN, formerly Panima Pharmaceuticals AG, occurred after January 1, 2009, we record contingent consideration liabilities at their fair value on the acquisition date and revalue these obligations each reporting period. We may pay up to approximately $1.2 billion in remaining milestones related to these acquisitions. For additional information related to our acquisition of StromedixConvergence please read Note 2, Acquisitions, to ourthese consolidated financial statements included in this report.statements.
BIH
In connection with our acquisition
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Fumapharm AG
In 2006 we acquired Fumapharm AG. As part of this acquisition we acquired FUMADERM and TECFIDERA (together, Fumapharm Products). We paid $220.0 million upon closing of the transaction and agreed to pay an additional $15.0 million if a Fumapharm Product was approved for MS in the U.S. or E.U. In the second quarter of 2013 we paid this $15.0 million contingent payment as TECFIDERA was approved in the U.S. for MS by the FDA. We are also required to make additional contingent payments to former shareholders of Fumapharm AG or holders of their rights based on the attainment of certain cumulative sales levels of Fumapharm Products and the level of total net sales of Fumapharm Products in the prior twelve month period, as defined in the acquisition agreement.
During 2014,2016 we paid a $25.0 million$1.2 billion in contingent paymentpayments as we reached the $1.0$7.0 billion, $8.0 billion, $9.0 billion and $10.0 billion cumulative sales levellevels related to the Fumapharm Products in 2013, a $150.0 million contingent payment as we reached the $2.0 billion cumulative sales level related to Fumapharm Products in the secondfourth quarter of 2014, a $200.0 million contingent payment as we reached2015 and the $3.0 billion cumulative sales level in thefirst, second and third quarterquarters of 20142016, respectively, and accrued $250.0$300.0 million upon reaching $4.0$11.0 billion in total cumulative sales of Fumapharm Products in the fourth quarter of 2014.2016.

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BIOGEN IDEC INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


We will owe an additional $300.0 million contingent payment for every additional $1.0 billion in cumulative sales level of Fumapharm Products reached if the prior 12 months sales of the Fumapharm Products exceed $3.0 billion, until such time as the cumulative sales level reaches $20.0 billion, at which time no further contingent paymentpayments shall be due. If the prior 12 months sales of Fumapharm Products are less than $3.0 billion, contingent payments remain payable on a decreasing tiered basis. These payments will be accounted for as an increase to goodwill as incurred, in accordance with the accounting standard applicable to business combinations when we acquired Fumapharm. Any portion of the payment which is tax deductible will be recorded as a reduction to goodwill. Payments are due within 60 days following the end of the quarter in which the applicable cumulative sales level has been reached.
Contingent Development, Regulatory and Commercial Milestone Payments
Based on our development plans as of December 31, 2016, we could make potential future milestone payments to third parties of up to approximately $3.1 billion, including approximately $0.5 billion in development milestones, approximately $0.8 billion in regulatory milestones and approximately $1.8 billion in commercial milestones as part of our various collaborations, including licensing and development programs. Payments under these agreements generally become due and payable upon achievement of certain development, regulatory or commercial milestones. Because the achievement of these milestones had not occurred as of December 31, 2016, such contingencies have not been recorded in our financial statements. Amounts related to contingent milestone payments are not considered contractual obligations as they are contingent on the successful achievement of certain development, regulatory approval and commercial milestones.
Other Funding Commitments
As of December 31, 2016, we have several on-going clinical studies in various clinical trial stages. Our most significant clinical trial expenditures are to contract research organizations (CROs). The contracts with CROs are generally cancellable, with notice, at our option. We have recorded accrued expenses of approximately $21.0 million on our consolidated balance sheet for expenditures incurred by CROs as of December 31, 2016. We have approximately $500.0 million in cancellable future commitments based on existing CRO contracts as of December 31, 2016.
Tax Related Obligations
We exclude liabilities pertaining to uncertain tax positions from our summary of contractual obligations as we cannot make a reliable estimate of the period of cash settlement with the respective taxing authorities. As of December 31, 2016, we have approximately $47.8 million of net liabilities associated with uncertain tax positions.
Solothurn, Switzerland Facility
On December 1, 2015, we purchased land in Solothurn, Switzerland where we are building a biologics manufacturing facility over the next several years. As of December 31, 2016, we had contractual commitments of $176.3 million for the construction of this facility.

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BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Leases
We rent laboratory and office space and certain equipment under non-cancelable operating leases. These lease agreements contain various clauses for renewal at our option and, in certain cases, escalation clauses typically linked to rates of inflation. Rental expense under these leases, net of amounts recognized in relation to exiting our manufacturing facility in Cambridge, Massachusetts and our Weston, Massachusetts facility, which terminate at various dates through 2028, amounted to $68.7 million, $68.6 million and $62.4 million in 2016, 2015 and 2014, respectively. In addition to rent, the leases may require us to pay additional amounts for taxes, insurance, maintenance and other operating expenses.
As of December 31, 2016, minimum rental commitments under non-cancelable leases, net of income from subleases, for each of the next five years and total thereafter were as follows:
(In millions)2017 2018 2019 2020 2021 Thereafter Total
Minimum lease payments$75.3
 $69.8
 $69.1
 $65.7
 $64.6
 $331.9
 $676.4
Less: income from subleases (1)(8.9) (15.2) (15.5) (15.7) (16.2) (55.4) (126.9)
Net minimum lease payments$66.4
 $54.6
 $53.6
 $50.0
 $48.4
 $276.5
 $549.5
23.  (1)Guarantees
Represents sublease income expected to be received for the vacated manufacturing facility in Cambridge, MA, the vacated portion of our Weston, Massachusetts facility and other facilities throughout the world. For additional information related to the sublease of the vacated manufacturing facility in Cambridge, MA, please read Note 3, Restructuring, Business Transformation and Other Cost Savings Initiatives to these consolidated financial statements.
Under certain of our lease agreements, we are contractually obligated to return leased space to its original condition upon termination of the lease agreement. At the inception of a lease with such conditions, we record an asset retirement obligation liability and a corresponding capital asset in an amount equal to the estimated fair value of the obligation. In subsequent periods, for each such lease, we record interest expense to accrete the asset retirement obligation liability to full value and depreciate each capitalized asset retirement obligation asset, both over the term of the associated lease agreement. Our asset retirement obligations were not significant as of December 31, 2016 or 2015.
Eisai Financing Arrangement
During 2015 we amended our existing lease related to Eisai's oral solid dose products manufacturing facility in RTP, North Carolina where we manufacture our and Eisai's oral solid dose products. For additional information, please read Note 10, Property, Plant and Equipment to these consolidated financial statements. As of December 31, 20142016, the net present values of the future minimum lease payments were as follows:
(In millions)As of December 31, 2016
2017$2.0
201816.7
Total18.7
Less: interest(0.6)
Net present value of the future minimum lease payments$18.1
22.      Guarantees
As of December 31, 2016 and 2013,2015, we did not have significant liabilities recorded for guarantees.
We enter into indemnification provisions under our agreements with other companies in the ordinary course of business, typically with business partners, contractors, clinical sites and customers. Under these provisions, we generally indemnify and hold harmless the indemnified party for losses suffered or incurred by the indemnified party as a result of our activities. These indemnification provisions generally survive termination of the underlying agreement. The maximum potential amount of future payments we could be required to make under these indemnification provisions is unlimited. However, to date we have not incurred material costs to defend lawsuits or settle claims related to these indemnification provisions. As a result, the estimated fair value of these agreements is minimal. Accordingly, we have no liabilities recorded for these agreements as of December 31, 20142016 and 2013.2015.

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24.  Employee Benefit Plans
BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

23.      Employee Benefit Plans
We sponsor various retirement and pension plans. Our estimates of liabilities and expenses for these plans incorporate a number of assumptions, including expected rates of return on plan assets and interest rates used to discount future benefits.
401(k) Savings Plan
We maintain a 401(k) Savings Plan, which is available to substantially all regular employees in the U.S. over the age of 21.21. Participants may make voluntary contributions. We make matching contributions according to the 401(k) Savings Plan’s matching formula. All matching contributions and participant contributions vest immediately. The 401(k) Savings Plan also holds certain transition contributions on behalf of participants who previously participated in the Biogen, Inc. Retirement Plan. The expense related to our 401(k) Savings Plan primarily consists of our matching contributions.
Expense related to our 401(k) Savings Plan totaled $49.3$45.2 million,, $39.3 $51.8 million and $32.8$49.3 million for the years ended December 31, 2014, 20132016, 2015 and 2012,2014, respectively.
Deferred Compensation Plan
We maintain a non-qualified deferred compensation plan, known as the Supplemental Savings Plan (SSP), which allows a select group of management employees in the U.S. to defer a portion of their compensation. The SSP also provides certain credits to highly compensated U.S. employees, which are paid by the company. These credits are known as the Restoration Match. The deferred compensation amounts are accrued when earned. Such deferred compensation is distributable in cash in accordance with the rules of the SSP. Deferred compensation amounts under such plan as of December 31, 20142016 and 20132015, totaled approximately $105.2$128.5 million and $84.7$126.9 million,, respectively, and are included in other long-term liabilities within the accompanyingin our consolidated balance sheets. The SSP also holds certain transition contributions on behalf of participants who previously participated in the Biogen, Inc. Retirement Plan. The Restoration Match and participant contributions vest immediately. Distributions to participants can be either in one lump sum payment or annual installments as elected by the participants.
Pension Plans
Our retiree benefit plans include defined benefit plans for employees in our affiliates in Switzerland and Germany as well as other insignificant defined benefit plans in certain other countries in which we maintain an operating presence.
Our Swiss plan is a government-mandated retirement fund that provides employees with a minimum investment return. The minimum investment return is determined annually by the Swiss government and was 1.75%1.25% in 20142016 and 1.5%1.75% in 20132015 and 2012,2014, respectively. Under thisthe Swiss plan, both we and certain of our employees with annual earnings in excess of government determined amounts are required to make contributions into a fund managed by an independent investment fiduciary. Employer contributions must be in an amount at least equal to the employee’s contribution. Minimum employee contributions are based on the respective employee’s age, salary and gender. As of December 31, 20142016 and 2013,2015, the PlanSwiss plan had an unfunded net pension obligation of approximately $31.9$39.1 million and $22.6$42.4 million,, respectively, and plan assets which totaled approximately $43.9$68.6 million and $38.1$63.9 million,, respectively. In 2014, 20132016, 2015 and 2012,2014, we recognized expense totaling $9.8$15.3 million,, $10.9 $12.9 million and $3.8$9.8 million,, respectively, related to our Swiss plan.
The obligations under the German planplans are unfunded and totaled $24.8$35.4 million and $20.0$27.6 million as of December 31, 20142016 and 2013,2015, respectively. Net periodic pension cost related to the German planplans totaled $3.5$4.2 million,, $3.3 $4.0 million and $1.9$3.5 million for the years ended December 31, 2014, 20132016, 2015 and 2012,2014, respectively.

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25.  Segment Information
BIOGEN INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

24.      Segment Information
We operate as one operating segment, which is focused on discovering, developing, manufacturing and delivering therapies forto people living with serious neurological, rare and autoimmune and hematologic disorders, and, therefore, ourdiseases. Our Chief Executive Officer (CEO), as the chief operating decision-maker, manages and allocates resources to the operations of our company ason a single operating segment. total company basis. Our research and development organization is responsible for the research and discovery of new product candidates and supports development and registration efforts for potential future products. Our pharmaceutical, operations and technology organization manages the development of the manufacturing processes, clinical trial supply, commercial product supply, distribution, buildings and facilities. Our commercial organization is responsible for U.S. and international development of our commercial products. The company is also supported by corporate staff functions. Managing and allocating resources on a total company basis enables our CEO to assess the overall level of resources available and how to best deploy these resources across functions, therapeutic areas, and research and development projects that are in line with our long-term company-wide strategic goals. Consistent with this decision-making process, our CEO uses consolidated, single-segment financial information for purposes of evaluating performance, forecasting future period financial results, allocating resources and setting incentive targets.
Enterprise-wide disclosures about product revenues, other revenues and long-lived assets by geographic area and information relating to major customers are presented below. Revenues are primarily attributed to individual countries based on location of the customer or licensee.
Revenue by product is summarized as follows:
For the Years Ended December 31,For the Years Ended December 31,
2014 2013 20122016 2015 2014
(In millions)
United
States
 
Rest of
World
 Total 
United
States
 
Rest of
World
 Total 
United
States
 
Rest of
World
 Total
United
States
 
Rest of
World
 Total 
United
States
 
Rest of
World
 Total 
United
States
 
Rest of
World
 Total
Multiple Sclerosis (MS):                                  
TECFIDERA$3,169.4
 $798.7
 $3,968.1
 $2,908.2
 $730.2
 $3,638.4
 $2,426.6
 $482.6
 $2,909.2
AVONEX$1,956.7
 $1,056.4
 $3,013.1
 $1,902.4
 $1,103.1
 $3,005.5
 $1,793.7
 $1,119.4
 $2,913.1
1,675.3
 638.2
 2,313.5
 1,790.2
 840.0
 2,630.2
 1,956.7
 1,056.4
 3,013.1
PLEGRIDY27.8
 16.7
 44.5
 
 
 
 
 
 
305.0
 176.7
 481.7
 227.1
 111.4
 338.5
 27.8
 16.7
 44.5
TECFIDERA2,426.6
 482.6
 2,909.2
 864.4
 11.7
 876.1
 
 
 
TYSABRI1,025.1
 934.4
 1,959.5
 814.2
 712.3
 1,526.5
 383.1
 752.8
 1,135.9
1,182.9
 780.9
 1,963.8
 1,103.1
 783.0
 1,886.1
 1,025.1
 934.4
 1,959.5
FAMPYRA
 80.2
 80.2
 
 74.0
 74.0
 
 57.4
 57.4

 84.9
 84.9
 
 89.7
 89.7
 
 80.2
 80.2
ZINBRYTA
 7.8
 7.8
 
 
 
 
 
 
Hemophilia:                                  
ELOCTATE445.2
 68.0
 513.2
 308.3
 11.4
 319.7
 58.4
 
 58.4
ALPROLIX72.1
 3.9
 76.0
 
 
 
 
 
 
268.0
 65.7
 333.7
 208.9
 25.6
 234.5
 72.1
 3.9
 76.0
ELOCTATE58.4
 
 58.4
 
 
 
 
 
 
Other product revenues:                                  
FUMADERM
 62.5
 62.5
 
 60.2
 60.2
 
 59.7
 59.7

 45.9
 45.9
 
 51.4
 51.4
 
 62.5
 62.5
SPINRAZA4.6
 
 4.6
 
 
 
 
 
 
BENEPALI
 100.6
 100.6
 
 
 
 
 
 
FLIXABI
 0.1
 0.1
 
 
 
 
 
 
Total product revenues$5,566.7
 $2,636.7
 $8,203.4
 $3,581.0
 $1,961.3
 $5,542.3
 $2,176.8
 $1,989.3
 $4,166.1
$7,050.4
 $2,767.5
 $9,817.9
 $6,545.8
 $2,642.7
 $9,188.5
 $5,566.7
 $2,636.7
 $8,203.4

F- 6071

BIOGEN IDEC INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


Geographic Information
The following tables contain certain financial information by geographic area:
December 31, 2016 (In millions)U.S. 
Europe(1)
 Germany Asia Other Total
Product revenues from external customers$7,050.4
 $1,533.5
 $703.7
 $217.3
 $313.0
 $9,817.9
Revenues from anti-CD20 therapeutic programs$1,249.5
 $1.9
 $
 $
 $63.1
 $1,314.5
Other revenues from external customers$224.7
 $70.0
 $1.5
 $20.2
 $
 $316.4
Long-lived assets$1,272.3
 $1,219.3
 $1.8
 $7.0
 $1.4
 $2,501.8
           
December 31, 2015 (In millions)U.S. 
Europe(1)
 Germany Asia Other Total
Product revenues from external customers$6,545.8
 $1,497.6
 $668.1
 $143.7
 $333.3
 $9,188.5
Revenues from anti-CD20 therapeutic programs$1,269.8
 $3.5
 $
 $
 $65.9
 $1,339.2
Other revenues from external customers$142.0
 $29.6
 $1.6
 $62.9
 $
 $236.1
Long-lived assets$1,296.5
 $879.4
 $2.3
 $7.7
 $1.7
 $2,187.6
           
December 31, 2014 (In millions)U.S. 
Europe(1)
 Germany Asia Other TotalU.S. 
Europe(1)
 Germany Asia Other Total
Product revenues from external customers$5,566.7
 $1,383.9
 $811.8
 $112.8
 $328.2
 $8,203.4
$5,566.7
 $1,383.9
 $811.8
 $112.8
 $328.2
 $8,203.4
Revenues from unconsolidated joint business$1,117.1
 $7.7
 $
 $
 $70.6
 $1,195.4
Revenues from anti-CD20 therapeutic programs$1,117.1
 $7.7
 $
 $
 $70.6
 $1,195.4
Other revenues from external customers$212.6
 $31.6
 $1.8
 $58.5
 $
 $304.5
$212.6
 $31.6
 $1.8
 $58.5
 $
 $304.5
Long-lived assets$1,055.5
 $701.9
 $2.5
 $2.6
 $3.2
 $1,765.7
$1,055.5
 $701.9
 $2.5
 $2.6
 $3.2
 $1,765.7
           
December 31, 2013 (In millions)U.S. 
Europe(1)
 Germany Asia Other Total
Product revenues from external customers$3,581.0
 $1,170.2
 $417.7
 $93.2
 $280.2
 $5,542.3
Revenues from unconsolidated joint business$1,087.3
 $1.6
 $
 $3.2
 $33.9
 $1,126.0
Other revenues from external customers$193.5
 $26.1
 $1.2
 $43.1
 $
 $263.9
Long-lived assets$984.4
 $758.3
 $2.5
 $2.1
 $3.3
 $1,750.7
           
December 31, 2012 (In millions)U.S. 
Europe(1)
 Germany Asia Other Total
Product revenues from external customers$2,176.8
 $1,216.2
 $409.2
 $93.2
 $270.7
 $4,166.1
Revenues from unconsolidated joint business$1,033.3
 $14.3
 $
 $27.5
 $62.8
 $1,137.9
Other revenues from external customers$170.2
 $27.9
 $1.1
 $13.3
 $
 $212.5
Long-lived assets$996.6
 $738.6
 $1.9
 $2.9
 $2.2
 $1,742.2
(1)Represents amounts related to Europe less those attributable to Germany.
Revenues from Unconsolidated Joint BusinessAnti-CD20 Therapeutic Programs
Approximately 12%11%, 16%12% and 21%12% of our total revenues in 2014, 20132016, 2015 and 2012,2014, respectively, are derived from our joint business arrangementcollaboration agreement with Genentech. For additional information related to our collaboration with Genentech, please read Note 20,19, Collaborative and Other Relationships to these consolidated financial statements.
Significant Customers
We recorded revenue from two wholesalers accounting for 33%35% and 27%22% of gross product revenues in 2014, 32%2016, 34% and 24%26% of gross product revenues in 2013,2015, and 20%33% and 10%27% of gross product revenues in 2012,2014, respectively.
Other
As of December 31, 2014, 20132016, 2015 and 2012,2014, approximately $676.0$643.6 million,, $731.1 $684.9 million and $713.4$676.0 million,, respectively, of our long-lived assets were related to our manufacturing facilities in Denmark. For 2014 compared to 2013, the decrease in the balance
As of December 31, 2016 and 2015, approximately $545.5 million and $161.5 million, respectively, of our long-lived assets were related to the construction of a biologics manufacturing facilitiesfacility in Denmark was dueSolothurn, Switzerland.
For additional information related to foreign currency exchange rates.our manufacturing facility in Solothurn, Switzerland, please read Note 10, Property, plant and equipment to these consolidated financial statements.

F- 6172

BIOGEN IDEC INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)


26.  
25.      Quarterly Financial Data (Unaudited)
(In millions, except per share amounts)
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Total
Year
2014(a) (b) (c) (b) (b)  
Product revenues$1,742.8
 $2,056.3
 $2,117.3
 $2,287.0
 $8,203.4
Unconsolidated joint business revenues$296.9
 $303.3
 $290.7
 $304.5
 $1,195.4
Other revenues$90.1
 $61.9
 $103.4
 $49.2
 $304.5
Total revenues$2,129.8
 $2,421.5
 $2,511.4
 $2,640.7
 $9,703.3
Gross profit (1)$1,850.5
 $2,129.6
 $2,208.8
 $2,343.4
 $8,532.3
Net income$479.7
 $723.1
 $856.1
 $882.6
 $2,941.6
Net income attributable to Biogen Idec Inc.$480.0
 $714.5
 $856.9
 $883.5
 $2,934.8
Basic earnings per share attributable to Biogen Idec Inc.$2.03
 $3.02
 $3.63
 $3.75
 $12.42
Diluted earnings per share attributable to Biogen Idec Inc.$2.02
 $3.01
 $3.62
 $3.74
 $12.37
(In millions, except per share amounts)
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Total
Year
2013 (d)  (e)  (e) (f)  (e)  
Product revenues$1,095.8
 $1,385.9
 $1,453.6
 $1,607.1
 $5,542.3
Unconsolidated joint business revenues$264.6
 $288.8
 $303.2
 $269.4
 $1,126.0
Other revenues$54.7
 $48.8
 $71.0
 $89.4
 $263.9
Total revenues$1,415.1
 $1,723.5
 $1,827.8
 $1,965.9
 $6,932.2
Gross profit (1)$1,281.4
 $1,492.8
 $1,593.1
 $1,707.3
 $6,074.5
Net income$426.7
 $490.7
 $487.6
 $457.3
 $1,862.3
Net income attributable to Biogen Idec Inc.$426.7
 $490.7
 $487.6
 $457.3
 $1,862.3
Basic earnings per share attributable to Biogen Idec Inc.$1.80
 $2.07
 $2.06
 $1.94
 $7.86
Diluted earnings per share attributable to Biogen Idec Inc.$1.79
 $2.06
 $2.05
 $1.92
 $7.81
(In millions, except per share amounts)
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Total
Year
2016(a) (b) (b) (c) (b) (d) (e)  
Product revenues, net$2,309.4
 $2,466.0
 $2,539.6
 $2,502.9
 $9,817.9
Revenues from anti-CD20 therapeutic programs$329.5
 $349.2
 $317.6
 $318.2
 $1,314.5
Other revenues$87.9
 $79.0
 $98.6
 $50.9
 $316.4
Total revenues$2,726.8
 $2,894.2
 $2,955.8
 $2,872.0
 $11,448.8
Gross profit (1)$2,413.8
 $2,523.9
 $2,538.9
 $2,493.5
 $9,970.1
Net income$969.2
 $1,048.4
 $1,030.2
 $647.9
 $3,695.7
Net income attributable to Biogen Inc.$970.9
 $1,049.8
 $1,032.9
 $649.2
 $3,702.8
Net income per share:         
Basic earnings per share attributable to Biogen Inc.$4.44
 $4.79
 $4.72
 $3.00
 $16.96
Diluted earnings per share attributable to Biogen Inc.$4.43
 $4.79
 $4.71
 $2.99
 $16.93
Weighted-average shares used in calculating:         
Basic earnings per share attributable to Biogen Inc.218.9
 219.1
 218.9
 216.6
 218.4
Diluted earnings per share attributable to Biogen Inc.219.3
 219.4
 219.4
 217.0
 218.8
(In millions, except per share amounts)
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Total
Year
2015    (f) (g) (a) (h)  
Product revenues, net$2,172.3
 $2,198.6
 $2,391.7
 $2,425.9
 $9,188.5
Revenues from anti-CD20 therapeutic programs$330.6
 $337.5
 $337.2
 $333.9
 $1,339.2
Other revenues$52.0
 $55.6
 $49.0
 $79.5
 $236.1
Total revenues$2,555.0
 $2,591.6
 $2,777.9
 $2,839.3
 $10,763.8
Gross profit (1)$2,242.6
 $2,305.5
 $2,467.9
 $2,507.5
 $9,523.4
Net income$820.2
 $924.8
 $1,019.5
 $828.7
 $3,593.2
Net income attributable to Biogen Inc.$822.5
 $927.3
 $965.6
 $831.6
 $3,547.0
Net income per share:         
Basic earnings per share attributable to Biogen Inc.$3.50
 $3.94
 $4.16
 $3.77
 $15.38
Diluted earnings per share attributable to Biogen Inc.$3.49
 $3.93
 $4.15
 $3.77
 $15.34
Weighted-average shares used in calculating:         
Basic earnings per share attributable to Biogen Inc.235.0
 235.3
 232.2
 220.4
 230.7
Diluted earnings per share attributable to Biogen Inc.235.6
 235.7
 232.6
 220.8
 231.2
(1) Gross profit is calculated as total revenues minusless cost of sales, excluding amortization of acquired intangible assets.
Full year amounts may not sum due to rounding.
(a)
Net income and net income attributable to Biogen Idec Inc., for the first quarter of 2014,2016 and the fourth quarter of 2015, includes pre-tax restructuring charges to researchtotaling $9.7 million and development expense of $117.7$93.4 million recorded upon entering into the collaboration agreement with Eisai.
(b)Product revenues and total revenues for the second, third and fourth quarters of 2014 includes net revenues, respectively related to ALPROLIX, ELOCTATE and PLEGRIDY. Commercial sales of ALPROLIX commenced in the second quarter of 2014 and commercial sales of ELOCTATE and PLEGRIDY commenced in the third quarter of 2014.2015 corporate restructuring program.
(c)Product revenues and total revenues for the second quarter of 2014 includes the recognition of $53.5 million of revenue previously deferred in Italy relating to the pricing agreement with AIFA.
(d)Our share of revenues from unconsolidated joint business reflects a charge of $41.5 million for damages and interest awarded to Hoechst in Genentech's arbitration with Hoechst for RITUXAN.
(e)Product revenues and total revenues for the second, third and fourth quarters of 2013 includes 100% of net revenues related to sales of TYSABRI as a result of our acquisition of all remaining rights to TYSABRI from Elan on April 2, 2013 and net revenues related to sales of TECFIDERA, which was approved by the FDA in March 2013 and commenced commercial sales in April 2013.
(f)Net income and net income attributable to Biogen Idec Inc., for the third quarter of 2013, includes a charge to research and development expense of $75.0 million related to an upfront payment made in connection with our collaboration agreement entered into with Isis.

F- 6273

BIOGEN IDEC INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(b)
Net income and net income attributable to Biogen Inc. for the second, third and fourth quarters of 2016 includes pre-tax additional depreciation expense totaling $15.8 million, $15.7 million and $14.0 million, respectively, as part of our determination to cease manufacturing in our small-scale biologics manufacturing facility in Cambridge, MA as well as vacate our warehouse space in Somerville, MA. Our departure from these facilities has shortened the expected useful lives of certain leasehold improvements and other assets at these facilities.
(c)
Net income and net income attributable to Biogen Inc. for the third quarter of 2016 includes a pre-tax charge to research and development expense of $75.0 million for a license fee paid to Ionis as we exercised our option to develop and commercialize SPINRAZA.
(d)
Net income and net income attributable to Biogen Inc. for the fourth quarter of 2016 includes a pre-tax charge to research and development expense of $50.0 million for a milestone payment due to Eisai related to the initiation of a phase 3 trial for E2609.
(e)
Net income and net income attributable to Biogen Inc. for the fourth quarter of 2016 includes a pre-tax charge of $454.8 million related to the January 2017 settlement and license agreement with Forward Pharma.
(f)
Net income and net income attributable to Biogen Inc. for the third quarter of 2015 includes a pre-tax charge to research and development expense of $48.1 million recorded upon entering into the collaboration agreement with AGTC.
(g)
Net income attributable to Biogen Inc. for the third quarter of 2015 reflects the attribution of a $60.0 million charge to noncontrolling interests, net of tax, related to a milestone payment due Neurimmune upon the enrollment of the first patient in a Phase 3 trial for aducanumab.
(h)
Net income and net income attributable to Biogen Inc. for the fourth quarter of 2015 includes a pre-tax charge to research and development expense of $60.0 million recorded upon entering into the collaboration agreement with MTPC.

27.26.      Subsequent Events
Convergence Pharmaceuticals
On January 11, 2015,February 1, 2017, we announced that we plan to acquire Convergence Pharmaceuticals (Convergence), a clinical-stage biopharmaceutical company with a focus on developing ion channel-modulating product candidates for neuropathic pain. The acquisition will be centered oncompleted the development of Convergence’s Phase 2 clinical candidate (CNV1014802), which has demonstrated clinical activity in proof of concept studies for trigeminal neuralgia (TGN), a chronic orphan disease consisting of debilitating, episodic facial pain. Additionally, CNV1014802 has demonstrated proof of concept for treating pain associated with lumbosacral radiculopathy, more commonly known as sciatica, and has potential applicability in several other neuropathic pain states.
Under the termsdistribution of the transaction,issued and outstanding common stock of Bioverativ to Biogen stockholders. For additional information related to the distribution of Bioverativ, please read Note 1, Summary of Significant Accounting Policies, to these consolidated financial statements.
In connection with the distribution, we entered into a separation and distribution agreement and various other agreements (including a transition services agreement, a tax matters agreement, a manufacturing and supply agreement, an employee matters agreement, an intellectual property matters agreement and certain other commercial agreements). These agreements govern the separation and distribution and the relationship between the two companies going forward. They also provide for the performance of services by each company for the benefit of the other for a period of time (including under the manufacturing and supply agreement pursuant to which we will pay Convergence shareholders an upfront payment of $200.0 million. Convergence shareholders are eligiblemanufacture and supply certain products and materials to receive additional payments up to $475.0 million contingent on future milestones.
Completion of the transaction is subject to customary closing conditions, including antitrust clearance in the U.S. under the Hart-Scott-Rodino Antitrust Improvements Act of 1976.Bioverativ).


F- 63


REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
To the Board of Directors and Shareholders of Biogen Idec Inc.
In our opinion, the accompanying consolidated balance sheets and the related consolidated statements of income, comprehensive income, equity and cash flows present fairly, in all material respects, the financial position of Biogen Idec Inc. and its subsidiaries at December 31, 20142016 and December 31, 2013,2015, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 20142016 in conformity with accounting principles generally accepted in the United States of America. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2014,2016, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). The.The Company's management is responsible for these financial statements, for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in Management’s AnnualManagement's Report on Internal Control over Financial Reporting appearing under Itemitem 9A. Our responsibility is to express opinions on these financial statements and on the Company's internal control over financial reporting based on our integrated audits. We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the financial statements are free of material misstatement and whether effective internal control over financial reporting was maintained in all material respects. Our audits of the financial statements included examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.
A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.
Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
/s/ PricewaterhouseCoopers LLP
Boston, Massachusetts
February 4, 20152, 2017

F- 64


EXHIBIT INDEX
Exhibit No.  Description
2.1† Asset Purchase Agreement among Biogen Idec International Holding Ltd., Elan Pharma International Limited and Elan Pharmaceuticals, Inc., dated as of February 5, 2013. Filed as Exhibit 2.1 to our Current Report on Form 8-K/A filed on February 12, 2013.
2.2Separation Agreement between Biogen Inc. and Bioverativ Inc. Filed as Exhibit 2.1 to our Current Report on Form 8-K filed on February 2, 2017.
3.1  Amended and Restated Certificate of Incorporation, as amended. Filed as Exhibit 3.1 to our Quarterly Report on Form 10-Q for the quarter ended June 30, 2012.
3.2 Second Amended and Restated Bylaws, as amended.Certificate of Amendment to the Certificate of Incorporation. Filed as Exhibit 3.1 to our QuarterlyCurrent Report on Form 10-Q for the quarter ended September 30, 2012.8-K filed on March 27, 2015.
3.3Third Amended and Restated Bylaws. Filed as Exhibit 3.2 to our Current Report on Form 8-K filed on March 27, 2015.
4.1  Reference is made to Exhibit 3.1 for a description of the rights, preferences and privileges of our Series A Preferred Stock and Series X Junior Participating Preferred Stock.
4.2  Indenture between Biogen Idec and The Bank of New York Trust Company, N.A. dated as of February 26, 2008. Filed as Exhibit 4.1 to our Registration Statement on Form S-3 (File No. 333-149379).
4.3  First Supplemental Indenture between Biogen Idec and The Bank of New York Trust Company, N.A. dated as of March 4, 2008. Filed as Exhibit 4.1 to our Current Report on Form 8-K filed on March 4, 2008.
4.4Indenture, dated September 15, 2015, between Biogen Inc. and U.S. Bank National Association. Filed as Exhibit 4.1 to our Current Report on Form 8-K filed on September 16, 2015.
4.5First Supplemental Indenture, dated September 15, 2015, between Biogen Inc. and U.S. Bank National Association. Filed as Exhibit 4.2 to our Current Report on Form 8-K filed on September 16, 2015.
10.1  Credit Agreement, amongdated August 28, 2015, between Biogen Idec,Inc., Bank of America, N.A., as administrative agent, swing line lender and an L/C issuer, and the other lenders party thereto. Filed as Exhibit 10.1 to our QuarterlyCurrent Report on Form 10-Q for the quarter ended March 31, 2013.8-K filed on September 1, 2015.
10.2†  Expression Technology Agreement between Biogen Idec and Genentech. Inc. dated March 16, 1995. Filed as an exhibit to Biogen Idec’s Quarterly Report on Form 10-Q for the quarter ended March 31, 1995.
10.3  Letter Agreement between Biogen Idec and Genentech, Inc. dated May 21, 1996. Filed as Exhibit 10.1 to our Current Report on Form 8-K filed on June 6, 1996.
10.4†  Second Amended and Restated Collaboration Agreement between Biogen Idec and Genentech, Inc. dated as of October 18, 2010. Filed as Exhibit 10.5 to our Annual Report on Form 10-K for the year ended December 31, 2010.
10.5†  Letter agreement regarding GA101 financial terms between Biogen Idec and Genentech, Inc. dated October 18, 2010. Filed as Exhibit 10.6 to our Annual Report on Form 10-K for the year ended December 31, 2010.
10.6*  Biogen Idec Inc. 2008 Amended and Restated Omnibus Equity Plan. Filed as Exhibit 10.1 to our Quarterly Report on Form 10-Q for the quarter ended March 31, 2014.
10.7*  Form of performance unit award agreement under the Biogen Idec Inc. 2008 Omnibus Equity Plan. Filed as Exhibit 10.2 to our Quarterly Report on Form 10-Q for the quarter ended March 31, 2014.
10.8* Form of market stock unit award agreement under the Biogen Idec Inc. 2008 Omnibus Equity Plan. Filed as Exhibit 10.3 to our Quarterly Report on Form 10-Q for the quarter ended March 31, 2014.
10.9*  Form of restricted stock unit award agreement under the Biogen Idec Inc. 2008 Omnibus Equity Plan. Filed as Exhibit 10.1 to our Current Report on Form 8-K filed on August 1, 2008.
10.10*  Form of nonqualified stock option award agreement under the Biogen Idec Inc. 2008 Omnibus Equity Plan. Filed as Exhibit 10.2 to our Current Report on Form 8-K filed on August 1, 2008.


Exhibit No.Description
10.11*  Form of cash-settled performance shares award agreement under the Biogen Idec Inc. 2008 Omnibus Equity Plan. Filed as Exhibit 10.1 to our Quarterly Report on Form 10-Q for the quarter ended March 31, 2010.
10.12* Form of performance shares award agreement under the Biogen Idec Inc. 2008 Omnibus Equity Plan. Filed as Exhibit 10.12 to our Annual Report on Form 10-K for the year ended December 31, 2013.
10.13*  Form of market stock unit award agreement under the Biogen Idec Inc. 2008 Omnibus Equity Plan. Filed as Exhibit 10.2 to our Quarterly Report on Form 10-Q for the quarter ended March 31, 2010.
10.14*  Biogen Idec Inc. 2006 Non-Employee Directors Equity Plan, as amended. Filed as Appendix A to our Definitive Proxy Statement on Schedule 14A filed on April 28, 2010.
10.15*Amendment to Biogen Idec Inc. 2006 Non-Employee Directors Equity Plan dated June 1, 2011. Filed as Exhibit 10.410.1 to our Quarterly Report on Form 10-Q for the quarter ended June 30, 2011.March 31, 2015.
10.16*10.15*  Biogen Idec Inc. 2005 Omnibus Equity Plan. Filed as Appendix A to our Definitive Proxy Statement on Schedule 14A filed on April 15, 2005.

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Exhibit No.Description
10.17*10.16*  Amendment No. 1 to the Biogen Idec Inc. 2005 Omnibus Equity Plan dated April 4, 2006. Filed as Exhibit 10.1 to our Quarterly Report on Form 10-Q for the quarter ended March 31, 2007.
10.18*10.17*  Amendment No. 2 to the Biogen Idec Inc. 2005 Omnibus Equity Plan dated February 12, 2007. Filed as Exhibit 10.2 to our Quarterly Report on Form 10-Q for the quarter ended March 31, 2007.
10.19*10.18*  Amendment to the Biogen Idec Inc. 2005 Omnibus Equity Plan dated April 18, 2008. Filed as Exhibit 10.7 to our Quarterly Report on Form 10-Q for the quarter ended June 30, 2008.
10.20*10.19*  Amendment to Biogen Idec Inc. 2005 Omnibus Equity Plan dated October 13, 2008. Filed as Exhibit 10.30 to our Annual Report on Form 10-K for the year ended December 31, 2008.
10.21*10.20*  Biogen Idec Inc. 2003 Omnibus Equity2015 Employee Stock Purchase Plan. Filed as Exhibit 10.73Appendix A to our Current Report on Form 8-K filed on November 12, 2003.
10.22*Amendment to Biogen Idec Inc. 2003 Omnibus Equity Plan. Filed as Exhibit 10.1 to our Quarterly Report on Form 10-Q for the quarter ended March 31, 2005.
10.23*Amendment to Biogen Idec Inc. 2003 Omnibus Equity Plan dated April 18, 2008. Filed as Exhibit 10.6 to our Quarterly Report on Form 10-Q for the quarter ended June 30, 2008.
10.24*Amendment to Biogen Idec Inc. 2003 Omnibus Equity Plan dated October 13, 2008. Filed as Exhibit 10.34 to our Annual Report on Form 10-K for the year ended December 31, 2008.
10.25*Biogen Idec Inc. 1995 Employee Stock Purchase Plan as amended and restated effective April 6, 2005. Filed as Appendix B to ourBiogen's Definitive Proxy Statement on Schedule 14A filed on April 15, 2005.30, 2015.
10.26*10.21*  Biogen Idec Inc. 2008 Performance-Based Management Incentive Plan. Filed as Appendix B to Biogen Idec’s Definitive Proxy Statement on Schedule 14A filed on May 8, 2008.
10.27*10.22*  Voluntary Executive Supplemental Savings Plan, as amended and restated effective January 1, 2004. Filed as Exhibit 10.13 to our Annual Report on Form 10-K for the year ended December 31, 2003.
10.28*10.23*  Supplemental Savings Plan, as amended and restated effective January 1, 2012.amended. Filed as Exhibit 10.3910.23 to our Annual Report on Form 10-K for the year ended December 31, 2011.2015.
10.29*10.24*  Voluntary Board of Directors Savings Plan, as amended and restated effective January 1, 2012.amended. Filed as Exhibit 10.4010.24 to our Annual Report on Form 10-K for the year ended December 31, 2011.2015.
10.30*10.25*  Biogen Idec Inc. Executive Severance Policy — U.S. Executive Vice President, as amended effective January 1, 2014. Filed as Exhibit 10.39 to our Annual Report on Form 10-K for the year ended December 31, 2013.
10.31*10.26*  Biogen Idec Inc. Executive Severance Policy — International Executive Vice President, as amended effective January 1, 2014. Filed as Exhibit 10.40 Annual Report on Form 10-K for the year ended December 31, 2013.
10.32*10.27*  Biogen Idec Inc. Executive Severance Policy — U.S. Senior Vice President, as amended effective October 13, 2008. Filed as Exhibit 10.53 to our Annual Report on Form 10-K for the year ended December 31, 2008.
10.33*10.28*  Biogen Idec Inc. Executive Severance Policy — International Senior Vice President, as amended effective October 13, 2008. Filed as Exhibit 10.54 to our Annual Report on Form 10-K for the year ended December 31, 2008.
10.34*10.29*  Annual Retainer Summary for Board of Directors. Filed as Exhibit 10.1 to our Quarterly Report on Form 10-Q for the quarter ended September 30, 2014.
10.35*10.30*  Form of indemnification agreement for directors and executive officers. Filed as Exhibit 10.1 to our Current Report on Form 8-K filed on June 7, 2011.
10.36*10.31*  Employment Agreement between Biogen Idec and George A. Scangos amended as of August 23, 2013. Filed as Exhibit 10.1 to our Current Report on Form 8-K filed on August 26, 2013.
10.37*10.32*  Letter regarding employment arrangement of Paul J. Clancy dated August 17, 2007. Filed as Exhibit 10.49 to our Annual Report on Form 10-K for the year ended December 31, 2007.

10.38*
Exhibit No.  Letter regarding employment arrangement of Douglas E. WilliamsDescription
10.33*Employment Agreement between Biogen Inc. and Michel Vounatsos dated December 7, 2010.18, 2016. Filed as Exhibit 10.5710.1 to our AnnualCurrent Report on Form 10-K for the year ended8-K filed on December 31, 2011.19, 2016.
10.39*Letter regarding employment arrangement of Steven H. Holtzman dated November 19, 2010. Filed as Exhibit 10.58 to our Annual Report on Form 10-K for the year ended December 31, 2011.
10.40*10.34*  Letter regarding employment arrangement of Kenneth DiPietro dated December 12, 2011. Filed as Exhibit 10.49 to our Annual Report on Form 10-K for the year ended December 31, 2012.
10.41*10.35* Letter regarding employment arrangement of Alfred Sandrock.Sandrock dated May 7, 2013. Filed as Exhibit 10.1 to our Quarterly Report on Form 10-Q for the quarter ended June 30, 2013.

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Exhibit No.Description
10.42*

10.36*
 Letter agreement regarding separationemployment arrangement of Raymond PawlickiAlfred Sandrock dated November 5, 2013.October 19, 2015. Filed as Exhibit 10.5110.37 to our Annual Report on Form 10-K for the year ended December 31, 2013.2015.
10.43*+10.37* Letter regarding employment arrangement of Adam Koppel.
10.44*+Letter regarding employment arrangement of Adriana Karaboutis.
21Subsidiaries.Susan Alexander dated December 13, 2005. Filed as Exhibit 2110.58 to our annual reportAnnual Report on Form 10-K for the year ended December 31, 2012.2009.
10.38*Letter regarding employment arrangement of Adriana Karaboutis dated August 7, 2014. Filed as Exhibit 10.44 to our Annual Report on Form 10-K for the year ended December 31, 2014.
10.39*Letter regarding employment arrangement of John Cox dated May 19, 2016. Filed as Exhibit 10.1 to our Quarterly Report on Form 10-Q for the quarter ended June 30, 2016.
10.40*Letter regarding separation arrangement of Tony Kingsley dated November 12, 2015. Filed as Exhibit 10.42 to our Annual Report on Form 10-K for the year ended December 31, 2015.
10.41Settlement and License Agreement, dated January 17, 2017, between Biogen Swiss Manufacturing GmbH, Biogen International Holding Ltd, Forward Pharma A/S and the other parties thereto. Filed as Exhibit 10.1 to our Current Report on Form 8-K filed on February 1, 2017.
21+Subsidiaries.
23+  Consent of PricewaterhouseCoopers LLP, an Independent Registered Public Accounting Firm.
31.1+  Certification of the Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2+  Certification of the Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1++  Certification of the Chief Executive Officer and the Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101++  The following materials from Biogen Idec Inc.’s Annual Report on Form 10-K for the year ended December 31, 2014,2016, formatted in XBRL (Extensible Business Reporting Language): (i) the Consolidated Statements of Income, (ii) the Consolidated Statements of Comprehensive Income, (iii) the Consolidated Balance Sheets, (iv) the Consolidated Statements of Cash Flows, (v) the Consolidated Statements of Equity and (vi) Notes to Consolidated Financial Statements.

^References to “our” filings mean filings made by Biogen Idec Inc. and filings made by IDEC Pharmaceuticals Corporation prior to the merger with Biogen, Inc. Unless otherwise indicated exhibits were previously filed with the Securities and Exchange Commission under Commission File Number 0-19311 and are incorporated herein by reference.
*Management contract or compensatory plan or arrangement.
Confidential treatment has been granted or requested with respect to portions of this exhibit.
+Filed herewith.
++Furnished herewith.

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