Table of Contents

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 10-K
ýFORMANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 193410-K

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the fiscal year ended December 28, 201831, 2021
or
TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the transition period from to

Commission File Number: 000-30235
¨
TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
Commission File Number: 000-30235
exel-20211231_g1.jpg
EXELIXIS, INC.
(Exact name of registrant as specified in its charter)

Delaware04-3257395
(State or other jurisdiction of incorporation or organization)(I.R.S. Employer Identification Number)

1851 Harbor Bay Parkway
Alameda, CA 94502
(650) 837-7000
(Address, including zip code, and telephone number, including area code, of registrant’s principal executive offices)
Securities Registered Pursuantregistered pursuant to Section 12(b) of the Act:
Title of Each Classeach classTrading Symbol(s)Name of Each Exchangeeach exchange on Which Registeredwhich registered
Common Stock $.001 Par Value per ShareEXELThe Nasdaq Stock Market LLC

Securities Registered Pursuantregistered 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  ý No ¨
Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act.  Yes  ¨ No ý
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  ý No ¨
Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes  ý No ¨
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 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. ¨
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.
Large accelerated filerýAccelerated filer¨
Non-accelerated filer¨Smaller reporting company¨
Emerging growth company¨
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. ¨
Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. ☒
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).  Yes  ¨ No ý
State the aggregate market value of the voting and non-voting common equity held by non-affiliates computed by reference to the price at which the common equity was last sold, or the average bid and asked price of such common equity, as of the last business day of the registrant’s most recently completed second fiscal quarter: $5,531.1 million (based on the closing sales price of the registrant’s common stock on June 29, 2018.$5,680,065,864. Excludes an aggregate of approximately 40.9 million shares of the registrant’s common stock held by persons who were directors and/or executive officers of the registrant at June 29, 2018July 2, 2021 on the basis that such persons may be deemed to have been affiliates of the registrant at such date. Exclusion of such shares should not be construed to indicate that any such person possesses the power, direct or indirect, to direct or cause the direction of the management or policies of the registrant or that such person is controlled by or under common control with the registrant.)
As of February 12, 2019, there were 300,129,630Number shares of the registrant’s common stock outstanding.outstanding as of February 7, 2022: 319,448,174
DOCUMENTS INCORPORATED BY REFERENCE
Certain portions of the registrant’s definitive proxy statement to be filed with the Securities and Exchange Commission pursuant to Regulation 14A, not later than April 27, 2019,30, 2022, in connection with the registrant’s 20182022 Annual Meeting of Stockholders are incorporated herein by reference into Part III of this Annual Report on Form 10-K.




EXELIXIS, INC.
ANNUAL REPORT ON FORM 10-K
INDEX
Page
Item 1.
Item 1A.
Item 1B.
Item 2.
Item 3.
Item 4.
Item 5.
Item 6.
Item 7.
Item 7A.
Item 8.
Item 9.
Item 9A.
Item 9B.
Item 9C.
Item 10.
Item 11.
Item 12.
Item 13.
Item 14.
Item 15.
Item 16.
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PART I
SPECIAL NOTE REGARDING FORWARD LOOKING STATEMENTS
Some of the statements under the captions “Risk Factors,” “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and “Business” and elsewhere in this Annual Report on Form 10-K are forward-looking statements. These statements are based on our current expectations, assumptions, estimates and projections about our business and our industry and involve known and unknown risks, uncertainties and other factors that may cause our company’s or our industry’s results, levels of activity, performance or achievements to be materially different from any future results, levels of activity, performance or achievements expressed or implied in, or contemplated by, the forward-looking statements. Our actual results and the timing of events may differ significantly from the results discussed in the forward-looking statements. Factors that might cause such a difference include those discussed inunder the heading “Item 1A. Risk Factors” as well as those discussed elsewhere in this Annual Report on Form 10-K.
These and many other factors could affect our future financial and operating results. We undertake no obligation to update any forward-looking statement to reflect events after the date of this report.
RISK FACTOR SUMMARY
Investing in our securities involves a high degree of risk. Below is a summary of material factors that make an investment in our securities speculative or risky. Importantly, this summary does not address all of the risks that we face. Additional discussion of the risks summarized in this risk factor summary, as well as other risks that we face, can be found under the heading “Item 1A. Risk Factors” below.
Our ability to grow our company is dependent upon the commercial success of CABOMETYX in its approved indications and the continued clinical development, regulatory approval, clinical acceptance and commercial success of the cabozantinib franchise in additional indications.
If we are unable to obtain or maintain coverage and reimbursement for our products from third-party payers, our business will suffer.
Pricing for pharmaceutical products, both in the U.S. and in foreign countries, has come under increasing attention and scrutiny by federal, state and foreign national governments, legislative bodies and enforcement agencies. These activities may result in actions that have the effect of reducing our revenue or harming our business or reputation.
The entrance of generic competitors and legislative and regulatory action designed to reduce the barriers to the development, approval and adoption of generic drugs in the U.S. could limit the revenue we derive from our products, most notably CABOMETYX, which could have a material adverse impact on our business, financial condition and results of operations.
We are subject to healthcare laws, regulations and enforcement, as well as laws and regulations relating to privacy, data collection and processing of personal data; our failure to comply with those laws could have a material adverse impact on our business, financial condition and results of operations.
Clinical testing of cabozantinib for new indications, or of new product candidates, is a lengthy, costly, complex and uncertain process that may fail ultimately to demonstrate safety and efficacy data for those products sufficiently differentiated to compete in our highly competitive market environment.
The regulatory approval processes of the U.S. Food and Drug Administration and comparable foreign regulatory authorities are lengthy, uncertain and subject to change, and may not result in regulatory approvals for additional cabozantinib indications or for our other product candidates, which could have a material adverse impact on our business, financial condition and results of operations.
We may be unable to expand our discovery and development pipeline, which could limit our growth and revenue potential.
Our profitability could be negatively impacted if expenses associated with our extensive clinical development, business development and commercialization activities, both for the cabozantinib franchise and our earlier-stage product candidates, grow more quickly than the revenues we generate.
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Our clinical, regulatory and commercial collaborations with major companies make us reliant on those companies for their continued performance and investments, which subjects us to a number of risks. For example, we rely on Ipsen and Takeda for the commercial success of CABOMETYX in its approved indications outside of the U.S., and we are unable to control the amount or timing of resources expended by these collaboration partners in the commercialization of CABOMETYX in its approved indications outside of the U.S. In addition, our growth potential is dependent in part upon companies with which we have entered into research collaborations, in-licensing arrangements and similar business development relationships.
Data breaches, cyber attacks and other failures in our information technology operations and infrastructure could compromise our intellectual property or other sensitive information, damage our operations and cause significant harm to our business and reputation.
If we are unable to adequately protect our intellectual property, third parties may be able to use our technology, which could adversely affect our ability to compete in the market.
If the COVID-19 pandemic is further prolonged or becomes more severe, our business operations and corresponding financial results could suffer, which could have a material adverse impact on our financial condition and prospects for growth.
The loss of key personnel or the inability to retain and, where necessary, attract additional personnel could impair our ability to operate and expand our operations.
BASIS OF PRESENTATION
We have adopted a 52- or 53-week fiscal year policy that generally ends on the Friday closest to December 31st. Fiscal year 20162021, which was a 52-week year, ended December 31, 2021, fiscal year 2020, which was a 52-week fiscal year, ended on December 30, 2016; fiscal year 2017 ended on December 29, 2017; fiscal year 2018 ended on December 28, 2018;January 1, 2021 and fiscal year 2019, will endwhich was a 53-week fiscal year, ended on January 3, 2020. For convenience, references in this report as of and for the fiscal years ended (or ending, as applicable) December 30, 2016, December 29, 2017, December 28, 2018January 1, 2021 and January 3, 2020 are indicated as being as of and for the years ended (or ending, as applicable) December 31, 2016, 2017, 20182020 and 2019, respectively. The annual period and quarterly period ending January 3, 2020 are a 53-week fiscal year and a 14-week fiscal quarter, respectively; all other annual periods presented are 52-week fiscal years and all interim periods presented are 13-week fiscal quarters.
Item 1. Business
Overview
Exelixis, Inc. (Exelixis, we, our or us) is an oncology-focused biotechnology company that aimsstrives to accelerate the discovery, development and commercialization of new medicines for difficult-to-treat cancers. OurUsing our considerable drug discovery, and development capabilities and commercialization platform are the foundations upon whichresources and capabilities, we intend to bringhave invented and brought to market novel, effectiveinnovative therapies that appropriately balance patient benefits and tolerable therapiesrisks; we will continue to build on this foundation as we strive to provide cancer patients with additionalnew treatment options.options that improve upon current standards of care.
Since we were founded in 1994,Today, four products resulting from our discovery efforts have progressed through clinical development and received regulatory approval; three have a growing commercial presence worldwide, and we expect that the fourth will soon enter the marketplaceoriginated in Japan. TwoExelixis laboratories are derived from cabozantinib,available to be prescribed to patients. Sales related to our flagship molecule, cabozantinib, account for the large majority of our revenues. Cabozantinib is an inhibitor of multiple tyrosine kinases including MET, AXL, VEGF receptors and RET. These are:RET and has been approved by the U.S. Food and Drug Administration (FDA) and in 61 other countries as: CABOMETYX® (cabozantinib) tablets approved for advanced renal cell carcinoma (RCC), both alone and in combination with Bristol-Myers Squibb Company’s (BMS) OPDIVO® (nivolumab), for previously treated hepatocellular carcinoma (HCC) and, currently by the FDA, for previously treated, radioactive iodine (RAI)-refractory differentiated thyroid cancer (DTC); and COMETRIQ® (cabozantinib) capsules approved for progressive, metastatic medullary thyroid cancer (MTC). For physicians treating these types of cancer, cabozantinib has become or is becoming a standardan important drug in their selection of care. Beyond its approved indications, cabozantinib is currently the focus of a broad clinical development program, and is being investigated both alone and in combination with other therapies in a wide variety of cancers. The growth that we have experienced in recent years is largely attributable to cabozantinib’s clinical and commercial success; consistent with our values and legal obligations, we are committed to ensuring that all patients who are prescribed cabozantinib are able to access this essential medicine.effective therapies.
The other two products resulting from our discovery efforts are: COTELLIC® (cobimetinib), an inhibitor of MEK approved as part of amultiple combination regimenregimens to treat specific forms of advanced melanoma and marketed under a collaboration with Genentech, Inc. (a member of the Roche Group) (Genentech); and MINNEBRO™MINNEBRO® (esaxerenone), an oral, non-steroidal, selective blocker of the mineralocorticoid receptor (MR) approved for the treatment of hypertension in Japan and licensed to Daiichi Sankyo Company, Limited (Daiichi Sankyo). For additional information about these products, see “—Collaborations and Business Development Activities—Other Collaborations.”
Over the courseThe year 2021 was our fifth year of 2018,profitability. Our total revenues from thegrew by approximately 45% as a result of markedly increased sales of CABOMETYXour cabozantinib products by our commercial organization in the U.S. and COMETRIQ and from theincreased royalties and milestone payments receivedmilestones earned pursuant to collaboration agreements with our partners, coupled with disciplined expense management, have fueled the growth ofex-U.S. partners. Our plan is to utilize our organization. We believe we can continue to grow in a sustainable manner, supported by a healthyoperating cash positionflows and profitability over the past two fiscal years. We are utilizing our cash and investments to enable future successexpand the cabozantinib franchise by expanding the development program for cabozantinibpotentially adding new indications in areas of unmet medical need. We will also leverage our operating cash flows to continue advancing our diverse small molecule and by building a pipeline of new drug candidates through reinitiated internal drug discovery efforts and the execution of strategic transactions that align with our oncology drug development and commercialization expertise. The following report details the progress we made executing our growth strategy in 2018.
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biotherapeutics programs, exploring multiple modalities and mechanisms of action to discover new oncology drugs. So far, these drug discovery and preclinical activities have resulted in four clinical-stage compounds: XL092, a next-generation oral tyrosine kinase inhibitor (TKI); XB002, an antibody drug conjugate (ADC) that targets tissue factor (TF); XL102, a potent, selective and orally bioavailable covalent inhibitor of cyclin-dependent kinase 7 (CDK7); and XL114, a novel anti-cancer compound that inhibits the CARD11-BCL10-MALT1 (CBM) complex.
Exelixis Marketed Products: CABOMETYX and COMETRIQ
As detailed below, CABOMETYX was firstand COMETRIQ have been approved to treat patients with various forms of cancer by the U.S. Food and Drug Administration (FDA) on April 25, 2016,FDA for the treatment of patients with advanced RCC who have received prior anti-angiogenic therapy and byU.S. market, the European Commission (EC) on September 9, 2016, similarly for the treatment of advanced RCC in adults in the European Union (EU) following prior VEGF-targeted therapy. On December 19, 2017, the FDA approved the expanded indication for CABOMETYX to include previously untreated patients with advanced RCC,markets and the EC approved CABOMETYX on May 17, 2018Japanese Ministry of Health, Labour and Welfare (MHLW), as a first-line treatment for adults with intermediate- or poor-risk advanced RCC. Most recently, CABOMETYX was approvedwell as by the FDA on comparable regulatory authorities across other markets worldwide.

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ProductIndicationApproval DateRegimenMajor Markets
CABOMETYX®
(cabozantinib)
Renal Cell Carcinoma (RCC)
Patients with advanced RCC who have received prior anti-angiogenic therapyApril 25, 2016MonotherapyU.S.
Advanced RCC in adults following prior VEGF-targeted therapySeptember 9, 2016MonotherapyEU
Patients with advanced RCCDecember 19, 2017MonotherapyU.S.
First-line treatment of adults with intermediate- or poor-risk advanced RCCMay 17, 2018MonotherapyEU
Patients with curatively unresectable or metastatic RCCMarch 25, 2020MonotherapyJapan
First-line treatment of patients with advanced RCCJanuary 22, 2021Combination with OPDIVO® (nivolumab)U.S.
First-line treatment for patients with advanced RCCMarch 31, 2021Combination with OPDIVOEU
Patients with unresectable or metastatic RCCAugust 25, 2021Combination with OPDIVOJapan
Hepatocellular Carcinoma (HCC)
HCC in adults who have previously been treated with sorafenibNovember 15, 2018MonotherapyEU
Patients with HCC who have been previously treated with sorafenibJanuary 14, 2019MonotherapyU.S.
Patients with unresectable HCC that has progressed after cancer chemotherapyNovember 27, 2020MonotherapyJapan
Differentiated Thyroid Cancer (DTC)
Adult and pediatric patients 12 years of age and older with locally advanced or metastatic DTC that has progressed following prior VEGF receptor-targeted therapy and who are RAI-refractory or ineligibleSeptember 17, 2021MonotherapyU.S.
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COMETRIQ®
(cabozantinib)
Medullary Thyroid Cancer (MTC)
Patients with progressive, metastatic MTCNovember 29, 2012MonotherapyU.S.
Adult patients with progressive, unresectable locally advanced or metastatic MTCMarch 25, 2014MonotherapyEU
In 2021, 2020 and 2019, for the treatment of patients with HCC who have been previously treated with sorafenib, which followed the EC’s earlier approval of CABOMETYX on November 15, 2018, for the treatment of HCC in adults previously treated with sorafenib. COMETRIQ, our first marketed product, was approved by the FDA on November 29, 2012, for the treatment of patients with progressive, metastatic MTC, and in March 2014, the EC granted COMETRIQ a conditional marketing authorization for the treatment of adult patients with progressive, unresectable locally advanced or metastatic MTC. In 2018 and 2017, weU.S. commercial organization generated $619.3$1,077.3 million, $741.6 million and $349.0$760.0 million, respectively, in net product revenues from sales of CABOMETYX and COMETRIQ inCOMETRIQ. Outside the U.S.
Outside, we rely on collaboration partners for the commercialization of CABOMETYX and COMETRIQ; Ipsen Pharma SAS (Ipsen) is responsible for all territories outside of the U.S. and Japan, CABOMETYX and COMETRIQ are marketed by our collaboration partner Ipsen Pharma SAS (Ipsen). Should CABOMETYX and COMETRIQ be approved in Japan, they will be marketed by our collaboration partner Takeda Pharmaceutical Company Limited (Takeda). is responsible for the Japanese market. In 20182021, 2020 and 2017,2019, we earned $32.3$105.2 million, $78.4 million and $3.8$62.4 million, respectively, of gross royalties foron net sales of cabozantinib products incorporating cabozantinib outside of the U.S. For additional information on the terms of our collaboration agreements with Ipsen and Takeda, see “—Collaborations—Collaborations and Business Development Activities—Cabozantinib Commercial Collaborations.
Renal Cell Carcinoma - CABOMETYX is Now thea Leading Tyrosine Kinase Inhibitor (TKI)TKI Treatment Option for Patients with Advanced RCC
CABOMETYX has become a standard of care for the treatment of patients suffering from advanced RCC, and a growing number of these patients have been or will be treated with CABOMETYX. Kidney cancer is among the top ten most commonly diagnosed forms of cancer among both men and women in the U.S., with Estimates suggest that approximately 30,00033,000 patients requiring systemic treatment. Globally, approximately 68,000 patientsin the U.S. and over 71,000 worldwide will require systemic treatment for kidney cancer. A growing number of these patientscancer in 2022, with RCC have been or will be treated with CABOMETYX, which has become a new standard of care for the treatment of patients suffering from this difficult-to-treat disease; in fact, as of December 2018, CABOMETYX was the TKI of choice among physicians treating theseover 15,000 patients in termsneed of new prescriptions.a first-line treatment in the U.S.
Since CABOMETYX was first approved, we have deployed our promotional and medical affairs teams have been focused on educatingto educate physicians about CABOMETYX’s unique clinical profile. WeCABOMETYX, and we believe that the product’s success of CABOMETYX is attributable to thisthe strength of the clinical profile, derived fromdata reflected in its FDA-approved labeling for advanced RCC. The CABOMETYX label incorporates the results of ourthe METEOR, CABOSUN and CheckMate -9ER clinical trials,trials. In July 2015, we announced positive results of METEOR, and CABOSUN.a phase 3 pivotal trial comparing CABOMETYX isto everolimus in patients with advanced RCC who have experienced disease progression following treatment with at least one prior VEGF receptor inhibitor. These results formed the basis for the FDA’s approval in April 2016, following which CABOMETYX became the first and only single-agent therapy approved in the U.S. for previously treated advanced RCC to demonstrate statistically significant and clinically meaningful improvements in three key efficacy parameters in a global pivotal trial: overall survival (OS); progression-free survival (PFS); and objective response rate (ORR). In addition,Subsequently, in October 2016, we announced positive results from CABOSUN, a randomized, open-label, active-controlled phase 2 trial conducted by the Alliance for Clinical Trials in Oncology, comparing cabozantinib with sunitinib in patients with previously untreated advanced RCC with intermediate- or poor-risk disease. These results formed the basis for the FDA’s approval in December 2017 of CABOMETYX for previously untreated patients with advanced RCC, and for this patient population, CABOMETYX is the only approved single-agent therapy to improvedemonstrate improved PFS and ORR compared with sunitinib, a first-generation TKI that was the previous standard of care. It is
CABOMETYX has also noteworthydemonstrated positive clinical results in combination with immune checkpoint inhibitors (ICIs), most notably in CheckMate -9ER, an open-label, randomized, multinational phase 3 pivotal trial evaluating OPDIVO, an ICI developed by BMS, in combination with CABOMETYX versus sunitinib in patients with previously untreated, advanced or metastatic RCC. Results from CheckMate -9ER demonstrated that on September 7, 2018, the combination of CABOMETYX and OPDIVO doubled PFS and ORR and reduced the risk of disease progression or death by 40% compared with sunitinib, and formed the basis for the FDA’s approval of the combination in January 2021 as a first-line treatment of patients with advanced RCC. The National Comprehensive Cancer Network (NCCN), the nation’s foremost non-profit alliance of leading cancer centers, updated has included the combination of CABOMETYX with OPDIVO in its Clinical Practice Guidelines to recommendfor Kidney Cancer as a Category 1 option for the first-line treatment of patients with clear cell RCC. The NCCN also lists single-agent CABOMETYX as the only TKIa category 1 preferred regimen in subsequent treatments for patients with preferred status for advancedclear cell RCC, patients who have progressed on prior therapy and for the treatment of advanced RCC regardless of patient risk status (favorable-, intermediate-, and poor risk). These updated recommendations strengthened the differentiation of CABOMETYX from other TKIs approved for this indication, leading many physicians to consider CABOMETYXas a preferred therapeutic option, despite numerous competing products approved to treat advanced RCC. For additional information aboutsystemic therapy regimen for non-clear cell RCC, supporting CABOMETYX’s profile as expressedposition in the METEOR and CABOSUN clinical trial data, see “—Cabozantinib Development Program—Clinical Trials Supporting Regulatory Approvals.”RCC treatment landscape.
In markets outside the U.S. in 2018,2021, we continued to work closely with our collaboration partner Ipsen in support of its regulatory strategy and commercialization efforts for CABOMETYX as a treatment for advanced RCC.RCC, both as a single
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agent and in combination with OPDIVO, as well as in preparation for submission of applications for approvals of CABOMETYX in combination with other therapies, and similarly with our collaboration partner Takeda with respect to the Japanese market. As a result of the approvals of CABOMETYX and/or the combination of CABOMETYX with OPDIVO for RCC indications in more than ten territories61 countries outside of the U.S., including the Member States of the EU, Japan, the U.K., Canada, Brazil, Taiwan, South Korea and Australia, CABOMETYX has continued to grow markedly outside the U.S. both in sales revenue and the number of RCC patients benefiting from its clinical effect. Additionally, with respect to the Japanese market, our partner Takeda is advancing its clinical development activities in Japan support of potential future regulatory filings for CABOMETYX in both RCC and HCC.
Hepatocellular Carcinoma - the CABOMETYX Label Expanded to IncludeOffers an Important Alternative for Patients with Previously Treated HCC
According to published studies, liver cancer is a leading cause of cancer death worldwide, accounting for more than 700,000800,000 deaths and 800,000900,000 new cases each year. In the U.S., the incidence of liver cancer has more than tripled since 1980. Although HCC is the most common form of liver cancer, making up about three-fourths of the estimated nearly 42,000 new

more than 41,000 cases of liver cancer estimated to be diagnosed in the U.S. during 2018,2022, this patient population washas long been underserved. Prior to 2017, there was only one approved systemic therapy for the treatment of HCC. Then, in 2017 and 2018, fourSince that time, multiple new therapies were approved in the U.S. for HCC, oneboth for previously untreated patients and three for patients previously treated with sorafenib. Given the introduction of new and demonstrably more effective therapies, including ICI combination therapies, we believe the second- and later-line market for HCC markettherapies has the potential to grow significantly in coming years, as thethese new treatment options are expected to resultimprove longer-term outcomes, thereby resulting in an increasinga greater number of patients receiving multiple lines of therapy. With the recent approval of CABOMETYX in January 2019 for HCC patients previously treated with sorafenib, we aimexpect to continue to play a key role in the advancement of therapeutic optionstreatment landscape for these patients.
The FDA’s approval of CABOMETYX for thisCABOMETYX’s HCC indication was based on our phase 3 pivotal study, CELESTIAL. The CELESTIAL study met its primary endpoint, demonstrating that cabozantinib significantly improved OS, as compared to placebo. For additional information on CELESTIAL, see “—Cabozantinib Development Program—Clinical Trials Supporting Regulatory Approvals—HCC - CELESTIAL.” Upon FDA approval, we were immediately prepared to offer CABOMETYX to all eligible HCC patients in the U.S. who may benefit from this treatment option. We were able to take action so quickly due to the strength of our existing commercial and medical affairs organizations, in addition to our well-established distribution network and our ability to leverage our RCC commercialization experience. The NCCN’s inclusion ofNCCN has included CABOMETYX in its Clinical Practice Guidelines for Hepatobiliary Cancers as a Category 1 option for the treatment of patients with HCC (Child-Pugh Class A only) who have been previously treated with sorafenib, providing further supportssupport for CABOMETYX as an important new treatment option for eligible HCC patients.
Outside the U.S., the EC’s approval of CABOMETYX provided physicians in the EU with a second approved therapy for the second-line treatment of this aggressive and difficult-to-treat cancer.cancer, and approvals from Health Canada and the Japanese MHLW brought a much-needed therapy to HCC patients in those countries. In addition to the Member States of the EU, Japan, the U.K. and Canada, CABOMETYX is also approved for previously treated HCC indications in Brazil, Taiwan, South Korea, Australia and Hong Kong, among other countries.
Differentiated Thyroid Cancer - a New Opportunity for CABOMETYX to Help an Underserved Patient Population
Published studies indicate that approximately 44,000 new cases of thyroid cancer will be diagnosed in the U.S. in 2022. Differentiated thyroid tumors, which make up about 90% of all thyroid cancers, are typically treated with surgery followed by ablation of the remaining thyroid with radioiodine (RAI). Approximately 5% to 15% of differentiated thyroid tumors are resistant to RAI treatment. With limited treatment options, these patients have a life expectancy of only three to six years from the time metastatic lesions are detected. New treatment options are therefore urgently needed.In December 2020, we announced that COSMIC-311, our phase 3 pivotal trial evaluating cabozantinib in patients with RAI-refractory DTC who have progressed after up to two prior VEGF receptor-targeted therapies, met its co-primary endpoint of demonstrating significant improvement in PFS as compared with placebo. These results formed the basis for the FDA’s approval in September 2021 of CABOMETYX for the treatment of adult and pediatric patients 12 years of age and older with locally advanced or metastatic DTC that has progressed following prior VEGF receptor-targeted therapy and who are RAI-refractory or ineligible. We commenced the commercial launch of CABOMETYX in this patient group upon the FDA’s approval, and we have seen a strong uptake in prescriptions for CABOMETYX in previously treated DTC during the months that followed.
Outside the U.S., our collaboration partner Ipsen submitted a variation application to the European Medicines Agency (EMA) seeking approval of CABOMETYX as a treatment for patients with previously treated, RAI-refractory DTC, with the EMA validating the variation application and beginning its centralized review process in August 2021.
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Medullary Thyroid Cancer - COMETRIQ, the First Commercial Approval of Cabozantinib
We estimateEstimates suggest that there are between 500 and 700 first-line and second-line patientswill be approximately 940 MTC cases diagnosed in the U.S. who will be eligiblein 2022, and COMETRIQ has served as an important treatment option for COMETRIQ.these patients since January 2013. The FDA’s approval of COMETRIQ for thisprogressive, metastatic MTC indication was based on our phase 3 trial, EXAM. The EXAM trial met its primary endpoint, demonstrating a statistically significant and clinically meaningful prolongation in PFS for cabozantinib, as compared to placebo. For additional information on EXAM, see “—Cabozantinib Development Program—Clinical Trials Supporting Regulatory Approvals—MTC - EXAM.” In 2018 and 2017, we generated $19.3 million and $25.0 million, respectively, in net product revenues from salesconnection with the approval of COMETRIQ for the treatment of progressive, metastatic MTC, we were subject to post-marketing requirements, including a requirement to conduct the EXAMINER clinical study, comparing a lower 60mg dose of cabozantinib with the labeled dose of 140 mg. Although EXAMINER did not meet the prespecified statistical noninferiority criterion for PFS (per Response Evaluation Criteria in Solid Tumors (RECIST) v. 1.1. as assessed by independent review) in the U.S.cabozantinib 60 mg arm compared with the 140 mg arm, it provided another rich data set of cabozantinib experience in MTC. In the meantime, we will continue to market COMETRIQ capsules for MTC patients at the labeled dose of 140 mg.
Exelixis Development Programs
We have extensive expertise in the clinical development of oncology products, which we leverage when exploring additional clinical uses of cabozantinib in combination with other therapies and advancing that effort to new regulatory approvals. Those activities comprise the broad cabozantinib development program described below. In addition, we also apply that expertise to advancing our company’s next generation of cancer treatments: new, innovative therapies that have the potential to help future cancer patients recover stronger and live longer. Accordingly, we are initiating clinical studies for our small molecule drug candidates—XL092, XL102 and XL114—as well as for our first biotherapeutics product candidate, XB002, and these activities are described under “—Other Development Programs - Advancing Exelixis’ Future Cancer Therapy Candidates.”
A summary of our cabozantinib and other development programs is provided below.
Cabozantinib Development Program
Cabozantinib inhibits the activity of tyrosine kinases, including MET, AXL, VEGF receptors, and RET. These receptor tyrosine kinases are involved in both normal cellular function and in pathologic processes such as oncogenesis, metastasis, tumor angiogenesis, drug resistance and maintenance of the tumor microenvironment. Objective tumor responses have been observed in patients treated with cabozantinib in more than 20multiple individual tumor types investigated in phase 1, 2 and 23 clinical trials to date, reflecting the medicine’s broad clinical potential. We are currently evaluatingcontinue to evaluate cabozantinib, both as a single agent and in combination with immune checkpoint inhibitors (ICIs),ICIs, in a broad development program comprising over 75100 ongoing or planned clinical trials across multiple indications.tumor types. We, along with our clinical and commercial collaboration partners, sponsor some of those trials, and independent investigators conduct the remaining trials through our Cooperative Research and Development Agreement (CRADA) with the National Cancer Institute’s Cancer Therapy Evaluation Program (NCI-CTEP) or our investigator sponsored trial (IST) program. In addition to co-sponsoringco-funding select trials with us, our commercial collaboration partners Ipsen and Takeda also conduct trials in their respective territories through similar independently-sponsored programs.

The following two tables summarize select cabozantinib clinical development activities, one describing studies that evaluate the potential of cabozantinib as a single-agent, and the other describing studies that evaluate the potential of cabozantinib in combination with one or moreother therapies, including ICIs:
CLINICAL DEVELOPMENT PROGRAM FOR CABOZANTINIB, SINGLE-AGENT
IndicationStatus Update
Thyroid Cancer
Progressive, metastatic medullary thyroid cancerApproved in U.S. and EU (EXAM)
Progressive, metastatic medullary thyroid cancerPost-marketing study (EXAMINER)
DifferentiatedSecond-line differentiated thyroid cancer (DTC) after prior VEGF receptor-targeted therapyPhase 3Approved in U.S. (COSMIC-311)
Renal Cell Carcinoma (RCC)
Advanced RCCApproved in U.S., EU and EUJapan (METEOR and CABOSUN)
First- or second-line papillary RCCRandomized phase 2† (PAPMET)(PAPMET/SWOG S1500)
Metastatic variant histology RCCPhase 2* (CABOSUN II)
Locally advanced non-metastatic clear cell RCCPhase 2*
Clear cell or non-clear cell metastatic RCCPhase 2*
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Hepatocellular Carcinoma (HCC)
Second- and later-line HCC after prior sorafenib
Approved in U.S. on January 14, 2019; approved in EU in November 2018and Japan (CELESTIAL)
Advanced HCC with Child-Pugh class B cirrhosis after first-line therapyPhase 2*
Non-Small Cell Lung Cancer (NSCLC)
EGFR wild-typePhase 2†
Molecular alterations in RET, ROS1, MET, AXL, or NTRK1Phase 2*
Additional Trials
High-risk prostate cancerPhase 2* (SPARC)
Metastatic castration-resistant prostate cancer (mCRPC) with genomic alterationsPhase 2*
Metastatic urothelial carcinoma (UC)Phase 2* (ATLANTIS)
Advanced or metastatic UCPhase 2†
Colorectal cancer (CRC)Phase 2*
High-grade uterine sarcomasPhase 2§
Metastatic gastrointestinal stromal tumorPhase 2§ (CABOGIST)
Pancreatic neuroendocrine tumors and carcinoid tumorsPhase 2* and Phase 3† (CABINET)
Metastatic adrenocortical carcinomaPhase 2*
Metastatic pheochromocytomas and paragangliomasPhase 2*
Plexiform neurofibromas (pediatric and adult cohorts)Phase 2*
Relapsed osteosarcoma or Ewing sarcomaNeuroendocrine neoplasmsPhase 2†2*
Soft-tissue sarcomasPhase 2†
Refractory germ cell tumorsPhase 2*
High-risk pediatric solid tumorsPhase 2* (CaboMain)
Pediatric refractory sarcoma, Wilms tumor and other rare tumorsPhase 2†
High-grade pediatric gliomaPhase 2*
____________________
*    Trial conducted through our IST program.
†     Trial conducted through collaboration with NCI-CTEP.
§     Trial sponsored by the European Organization for Research and Treatment of Cancer.

*Trial conducted through our IST program.
Trial conducted through collaboration with NCI-CTEP.
§Trial sponsored by the European Organization for Research and Treatment of Cancer.


CLINICAL DEVELOPMENT PROGRAM FOR CABOZANTINIB, IN COMBINATION WITH IMMUNE CHECKPOINT INHIBITORSOTHER THERAPIES
IndicationCombination RegimenStatus Update
Genitourinary Cancers
First-line advanced RCC+ nivolumabApproved in U.S., EU and Japan (CheckMate -9ER)
First-line advanced or metastatic RCC+ nivolumab + ipilimumabPhase 3 pivotal trial (CheckMate 9ER)(COSMIC-313)
Cisplatin-Ineligible advanced UCmCRPC that progressed during or following treatment with one novel hormonal therapy (NHT)+ pembrolizumabatezolizumabPhase 2* (PemCab)3 pivotal trial (CONTACT-02)
Advanced RCC that progressed during or following treatment with an immune checkpoint inhibitor (ICI)+ atezolizumabPhase 3 pivotal trial (CONTACT-03)
First-line metastatic RCC+ nivolumab vs. nivolumab after 4 cycles of nivolumab + ipilimumabPhase 3† randomized (PDIGREE)
Advanced or metastatic non-clear cell RCC+ nivolumabPhase 2*
Gastrointestinal CancersAdvanced RCC with bone metastasis+ radium-223 dichloridePhase 2† (RadiCaL)
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Cisplatin-Ineligible advanced UC+ pembrolizumabPhase 2* (PemCab)
Neoadjuvant muscle-invasive UC+ atezolizumabPhase 2* (ABATE)
Genitourinary tumors+ nivolumab ± ipilimumabPhase 1b†
Genitourinary tumors+ nivolumab + ipilimumabPhase 2† (ICONIC)
Advanced non-clear cell RCC+ nivolumab + ipilimumabPhase 2*
Metastatic RCC+ nivolumab after cytoreductive surgeryPhase 2* (Cyto-KIK)
Metastatic RCC+ avelumabPhase 1b*
Locally advanced or metastatic UC+ enfortumab vedotinPhase 1*
Metastatic hormone-sensitive prostate cancer+ abiraterone + nivolumabPhase 1* (CABIOS)
Metastatic RCC+ nivolumab ± CBM 588Phase 1*
Gastrointestinal Cancers
First-line advanced HCC+ atezolizumabPhase 3 pivotal trial (COSMIC-312), including a single-agent cabozantinib exploratory arm
Second-First- and later-line advanced HCC+ nivolumab ± ipilimumabPhase 1/2 (Checkmate(CheckMate 040)
Neoadjuvant locally advanced HCC± nivolumabPhase 1b*
KRAS wild-type metastatic CRC and cMET amplified metastatic CRCHCC who are not candidates for curative intent treatment
± panitumumab

+ nivolumab + ipilimumab + transarterial chemoembolization
Phase 1* (CaboMAb)2*
Lung CancersAdvanced HCC+ pembrolizumabPhase 2*
NSCLCRefractory metastatic microsatellite stable CRC+nivolumabPhase 2*
Metastatic, refractory pancreatic cancer+ atezolizumabPhase 2*
Metastatic pancreatic adenocarcinoma+pembrolizumabPhase 2*
Metastatic colorectal adenocarcinoma+trifluridine/tipiracilPhase 1*
Thyroid Cancers
Advanced DTC+ nivolumab ±+ ipilimumabPhase 2†
GynecologicLung Cancers
Metastatic NSCLC previously treated with an ICI and platinum-containing chemotherapy+ atezolizumabPhase 3 pivotal trial (CONTACT-01)
Previously treated non-squamous NSCLC+ nivolumabRandomized phase 2†
Gynecologic Cancers
Advanced or metastatic endometrial cancer+ nivolumabPhase 2†
Metastatic, triple negative breast cancer+ nivolumabPhase 2*Neuroendocrine Tumors (NET) and Carcinoid
Breast cancer with brain metastasesAdvanced carcinoid tumors± trastuzumab+ nivolumabPhase 2*
Poorly differentiated neuroendocrine carcinomas+ nivolumab + ipilimumabPhase 2†
Head and Neck Cancers
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Recurrent, metastatic squamous cell carcinoma+ cetuximabPhase 1*
Recurrent, metastatic squamous cell carcinoma+ pembrolizumabPhase 2*
Melanoma
Unresectable, advanced melanoma+ nivolumab + ipilimumabPhase 2*
Advanced, metastatic melanoma+ pembrolizumabPhase 2*
Sarcoma
Unresectable or metastatic leiomyosarcoma and other soft tissue sarcomas+ temozolomidePhase 2*
Sarcomas of the extremities+ radiation therapyPhase 2*
Metastatic soft tissue sarcomas+ PD-1 + CTLA-4 inhibitionPhase 2*
Angiosarcoma pre-treated with taxane+ nivolumabPhase 2†
Additional Trials in Multiple Tumor Types
Advanced solid tumors+ atezolizumabPhase 1b (COSMIC-012) with 1820 cabozantinib and atezolizumab expansion cohorts, including mCRPC, RCC, UC, castration-resistant prostate cancer (CRPC), HCC, colorectal adenocarcinoma, DTC, NSCLC, endometrial cancer, ovarian cancer, breast cancer, gastric or gastroesophageal junction adenocarcinoma and head and neck cancer, (COSMIC-021), and 2two single-agent cabozantinib exploratory cohorts (UC(NSCLC and NSCLC)mCRPC), and one single-agent atezolizumab exploratory cohort (mCRPC)
Genitourinary tumors+ nivolumab ± ipilimumabPhase 1b†
Advanced CRC, HCC, gastric, gastroesophageal or esophageal adenocarcinoma+ durvalumabPhase 1* (CAMILLA)
Metastatic or recurrent gastric or gastro-esophageal adenocarcinoma+ pembrolizumabPhase 2*
Advanced non-squamous NSCLC, UC and advanced malignant mesothelioma+ pemetrexedPhase 1*
Multiple solid tumor types and HIV+ nivolumabPhase 1†
Advanced solid tumors+ pamiparibPhase 1*
Pediatric multiple tumor types+ retinoic acidPhase 1*
____________________
*Trial conducted through our IST program.
Trial conducted through collaboration with NCI-CTEP.
§
*    Trial conducted through our IST program.
†     Trial conducted through collaboration with NCI-CTEP.
§     Trial sponsored by the European Organization for Research and Treatment of Cancer.
Clinical Trials Supporting Regulatory Approvals
RCC - METEOR
In July 2015, we announced positive results of METEOR, a phase 3 pivotal trial comparing CABOMETYX to everolimus in patients with advanced RCC who have experienced disease progression following treatment with at least one prior VEGF receptor inhibitor. METEOR met its primary endpoint, demonstrating a statistically significant and clinically

meaningful increase in PFS for CABOMETYX. The median PFS was 7.4 months for the CABOMETYX arm versus 3.8 months for the everolimus arm. CABOMETYX also significantly improved ORR, a secondary endpoint, compared with everolimus. In September 2015, The New England Journal of Medicine (NEJM) published the complete, detailed positive results from the primary analysis of METEOR, and these results were also presented at the European Society for Medical Oncology (ESMO) 2015 Congress. After additional follow up, METEOR also met its other secondary endpoint of OS, as presented in June 2016 at the American Society of Clinical Oncology (ASCO) 2016 Annual Meeting and published in Lancet Oncology. The median OS was 21.4 months for patients receiving CABOMETYX versus 16.5 months for those receiving everolimus. The safety profile in the study and in later analyses was consistent with the established profile of cabozantinib and other TKIs.
On the basis of the data from the METEOR trial, the FDA approved CABOMETYX for the treatment of patients with advanced RCC following prior antiangiogenic therapy, and the European Medicines Agency (EMA) approved CABOMETYX for the treatment of advanced RCC in adults following prior VEGF-targeted therapy.
RCC - CABOSUN
In October 2016, we announced positive results from CABOSUN, a randomized, open-label, active-controlled phase 2 trial comparing cabozantinib with sunitinib in patients with previously untreated advanced RCC with intermediate- or poor-risk disease conducted by The Alliance for Clinical Trials in Oncology under our CRADA with NCI-CTEP. These results were presented at the ESMO 2016 Congress in October 2016 and subsequently published in the Journal of Clinical Oncology in November 2016. CABOSUN met its primary endpoint, demonstrating a statistically significant and clinically meaningful improvement in investigator-assessed PFS compared with sunitinib. The median PFS for cabozantinib was 8.2 months versus 5.6 months for sunitinib. Investigator-assessedORR, a secondary endpoint, was also significantly improved, at 33% for cabozantinib versus 12% for sunitinib, and median OS, another secondary endpoint, showed a trend favoring cabozantinib with 30.3 months versus 21.8 months for sunitinib. Updated results from CABOSUN were presented at the ESMO 2017 Congress in September 2017 and subsequently published in the European Journal of Cancer in May 2018. The updated results included the analysis from a blinded independent radiology review committee (IRRC), which confirmed the primary efficacy endpoint results of investigator-assessed PFS, as well as an updated investigator-assessed analysis. Per the IRRC analysis, the median PFS for cabozantinib was 8.6 months versus 5.3 months for sunitinib, and both the updated investigator assessment and IRRC analysis demonstrated consistent and statistically significant improvement of PFS with cabozantinib as compared to sunitinib. The updated OS analysis had a data cut-off of July 1, 2017, and showed a favorable trend for patients randomized to cabozantinib compared to sunitinib that was not statistically significant. Median OS was 26.6 months for patients receiving cabozantinib versus 21.2 months for those receiving sunitinib. The safety profile in the study and in later analyses was consistent with the established profile of cabozantinib and other TKIs.
On the basis of the data from the CABOSUN trial, the FDA approved CABOMETYX for the treatment of patients with previously untreated, advanced or metastatic RCC on December 19, 2017, and we commenced our commercial launch of CABOMETYX for this new indication immediately upon such approval. Additionally, on May 17, 2018, the EC approved cabozantinib as a first-line treatment for adults with intermediate- or poor-risk advanced RCC.
RCC - Retrospective Analyses of CABOSUN and METEOR
As the advanced RCC treatment landscape continues to evolve and include multiple ICI treatment options, biomarker analyses are of increasing importance to help select for advanced RCC patients who would potentially derive the most clinical benefit from CABOMETYX. Two relevant retrospective analyses were presented at the ESMO 2018 Congress in October 2018 that described the potential utility of CABOMETYX in patients with advanced RCC regardless of their PD-L1 status, as well as in those patients with advanced RCC who progressed on previous ICI monotherapy or combination treatment.
The first analysis of data from the CABOSUN and METEOR trials evaluated the effect of PD-L1 expression on clinical outcomes with cabozantinib in advanced RCC and demonstrated that cabozantinib improved clinical outcomes regardless of PD-L1 status, relative to sunitinib or everolimus, the respective comparator arms for each trial. The findings showed that PD-L1 expression was associated with shorter median PFS and OS in both METEOR and CABOSUN. Treatment with cabozantinib, however, improved PFS and OS compared with everolimus (METEOR) and sunitinib (CABOSUN) in both PD-L1 positive and PD-L1 negative patients. An additional retrospective analysis found that cabozantinib was active in patients previously treated with ICIs, either alone or in combination with anti-VEGF or other therapies. At a median follow-up of 12 months, ORR was 33%, disease control rate (DCR) was 79% and the one-year OS rate was 53%. Together, these analyses evaluating data from the CABOSUN and METEOR clinical trials contribute to cabozantinib’s unique product profile, as well as its value as a treatment option for patients with advanced RCC within an evolving and competitive treatment landscape that includes multiple ICI treatment options.

HCC - CELESTIAL
In October 2017, we announced positive results of CELESTIAL, our phase 3 pivotal trial comparing cabozantinib to placebo in patients with HCC who had received previous treatment with sorafenib. The CELESTIAL trial, which we initiated in September 2013, was designed to enroll 760 patients who had received prior systemic therapy with sorafenib, could have received up to two prior systemic therapies for HCC, and must have progressed following at least one prior therapy. The CELESTIAL trial was conducted at more than 100 sites globally in 19 countries and enrollment was completed in September 2017. Patients were randomized 2:1 to receive 60 mg of cabozantinib daily or placebo and were stratified based on etiology of the disease (hepatitis C, hepatitis B or other), geographic region (Asia or other regions) and presence of extrahepatic spread and/or macrovascular invasion (yes or no). No cross-over was allowed between the study arms.
In October 16, 2017, we announced that CELESTIAL had met its primary endpoint, with cabozantinib providing a statistically significant and clinically meaningful improvement versus placebo in OS, and that the independent data monitoring committee (IDMC), recommended CELESTIAL be stopped for efficacy. In January 2018, statistically significant and clinically meaningful positive results from the second interim analysis of CELESTIAL were presented during an oral session at the 2018 ASCO’s Gastrointestinal Cancers Symposium. In July 2018, the NEJM also published the complete, detailed positive results from CELESTIAL. In the total population of second- and third-line patients, median OS was 10.2 months with cabozantinib versus 8.0 months with placebo (hazard ratio (HR) 0.76; 95% confidence interval (CI) 0.63-0.92; p=0.0049). Median PFS was more than doubled, at 5.2 months with cabozantinib and 1.9 months with placebo (HR 0.44; 95% CI 0.36-0.52; p<0.0001). ORR was 4% with cabozantinib and 0.4% with placebo (p=0.0086). Disease control (partial response (PR) or stable disease (SD)) was achieved by 64% of patients in the cabozantinib group compared with 33% in the placebo group. In a subgroup analysis of patients whose only prior therapy for HCC was sorafenib (70% of patients in the study), median OS was 11.3 months with cabozantinib versus 7.2 months with placebo (HR 0.70; 95% CI 0.55-0.88). PFS in the subgroup was 5.5 months with cabozantinib versus 1.9 months with placebo (HR 0.40; 95% CI 0.32-0.50). The safety profile of cabozantinib observed in the study was consistent with the established profile of cabozantinib and other TKIs.
On the basis of the data from the CELESTIAL trial, the FDA approved CABOMETYX on January 14, 2019 for the treatment of patients with HCC who have been previously treated with sorafenib, and we commenced our commercial launch of CABOMETYX for this new indication immediately upon such approval. Additionally, on November 15, 2018, our partner Ipsen received EC approval of CABOMETYX as a monotherapy for HCC in adults who have previously been treated with sorafenib.
MTC - EXAM
In October 2011, we announced positive results from EXAM, a phase 3 international, multi-center, randomized double-blinded controlled trial of COMETRIQ in patients with progressive, metastatic MTC. EXAM met its primary endpoint, demonstrating a statistically significant and clinically meaningful prolongation in PFS for COMETRIQ-treated patients compared to those receiving placebo, with median PFS of 11.2 months in the COMETRIQ arm versus 4.0 months in the placebo arm. In addition, the ORR was 27% with PRs observed only among patients in the COMETRIQ arm, and the median duration of objective response was 14.7 months for patients treated with COMETRIQ. These primary results were presented at the ASCO 2012 Annual Meeting in June 2012 and subsequently published in the Journal of Clinical Oncology in October 2013. In November 2014, we announced completion of the OS analysis, a secondary endpoint of the study. Consistent with an earlier interim analysis, there was no statistically significant difference in OS between the treatment arms. The median OS was 26.6 months for the COMETRIQ arm and 21.1 months for the placebo arm. We presented the final results at the ASCO 2015 Annual Meeting and submitted the results to regulatory authorities to satisfy post-marketing commitments. The safety profile in the study was consistent with the established profile of cabozantinib and other TKIs.
On the basis of the data from the EXAM trial, the FDA approved COMETRIQ on November 29, 2012, for the treatment of patients with progressive, metastatic MTC. In March 2014, the EC granted COMETRIQ a conditional marketing authorization for the treatment of adult patients with progressive, unresectable locally advanced or metastatic MTC. COMETRIQ is marketed and commercialized in the EU by Ipsen. In connection with the approval of COMETRIQ for the treatment of progressive, metastatic MTC, we were subject to post-marketing requirements, all of which have been satisfied, other than a requirement to conduct the EXAMINER clinical study, comparing a lower dose of cabozantinib with the labeled dose of 140 mg. EXAMINER is evaluating safety and PFS in progressive, metastatic MTC patients and is ongoing.
Late-Stage Exelixis Sponsored Trials Evaluating Cabozantinib as a Monotherapy
DTC - COSMIC-311
Published studies indicate that approximately 54,000 new cases of thyroid cancer will be diagnosed in the U.S. in 2019. With the incidence of thyroid cancer increasing more rapidly than any other type of cancer in the U.S., and limited

options available to patients whose disease has progressed following treatment with radioiodine (RAI) and anti-VEGFR therapy, we believe there is an urgent need for new treatment options.
Informed by cabozantinib’s encouraging clinical activity in phase 1 and 2 studies in patients with RAI-refractory differentiated thyroid cancer (DTC), in October 2018 we initiated COSMIC-311, a multicenter, randomized, double-blind, placebo-controlled phase 3 pivotal trial evaluating cabozantinib in patients with RAI-refractory DTC who have progressed after up to two prior VEGFR-targeted therapies. The co-primary endpoints for the trial are PFS and ORR. The trial aims to enroll approximately 300 patients at approximately 150 sites globally. Patients will be randomized in a 2:1 ratio to receive either cabozantinib 60 mg or placebo once daily.
Trials Conducted Under our Clinical Collaboration Agreements
Cabozantinib has shownWe continue to invest significantly in the exploration of additional clinical anti-tumor activity with objective responses observed in more than 20 formsuses of cancer in phase 1 and 2 evaluation; we are, therefore, focused on advancing a broad cabozantinib clinical development program to fully investigate its therapeutic potential, both alone and in combination with other therapies. In particular, given that clinical observations from early-stage clinical trials evaluating cabozantinib in combination with ICIs have shown preliminary promising activity across a diverse range of tumors, and that patients have been able to tolerate these drug combinations, we are focused on exploring the potential of cabozantinib in combination with ICI’sICIs in later-stage settings.additional late-stage or other potentially label-enabling trials.
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Combination Studies with Bristol-Myers Squibb Company (BMS)BMS
Preclinical data and clinical observations from an ongoing phase 1 trial evaluating cabozantinib in combination with nivolumab, with or without ipilimumab, in patients with previously treated genitourinary tumors suggest that cabozantinib may result in a more immune-permissive tumor environment. In consideration of those results, in February 2017, we entered into a clinical collaboration agreement with BMS for the purpose of conducting clinical studies combining cabozantinib with BMS’ PD-1 ICI, nivolumab, both with or without BMS’ CTLA-4 ICI, ipilimumab.
As part Based on the data from CheckMate -9ER, the first clinical trial conducted under this collaboration, the FDA approved CABOMETYX in combination with OPDIVO on January 22, 2021 as a first-line treatment of the collaboration, we are evaluatingpatients with advanced RCC. We continue to evaluate these combinations in COSMIC-313, a phase 3 pivotal trial in previously untreated or metastatic advanced RCC and in a phase 1/2 trial in both previously treated and previously untreated advanced HCC. We also intend to evaluate these combinations in other phase 3 pivotal trials in various other tumor types, including UC.RCC. Pursuant to our agreements with BMS, each party will beis responsible for supplying finished drug product for the applicable clinical trial, and responsibility for the payment of costs for each trial will beis determined on a trial-by-trial basis. For additional information on the terms of the clinical trial collaboration agreement, see “—Collaborations—Collaborations and Business Development Activities—Cabozantinib Development Collaborations—BMS.
RCC - CheckMate 9ER
CheckMate 9ER is an open-label,COSMIC-313. In May 2019, we initiated COSMIC-313, a multicenter, randomized, multi-nationaldouble-blinded, controlled phase 3 pivotal trial evaluating the triplet combination of cabozantinib, nivolumab inand ipilimumab versus the combination with cabozantinib versus sunitinibof nivolumab and ipilimumab in patients with previously untreated advanced intermediate- or metastaticpoor-risk RCC. The original trial protocol required patients to bePatients were randomized 1:1:1 to onethe experimental arm of three arms: cabozantinib and nivolumab;the triplet combination of cabozantinib, nivolumab and ipilimumab;ipilimumab or sunitinib. However, followingto the positive results of CheckMate 214, BMS’s phase 3 trial evaluating nivolumab combined with ipilimumab versus sunitinib monotherapy in patients with previously untreated metastatic RCC and in an effort to accelerate the development of the cabozantinib and nivolumab combination, the trial protocol was amended to remove the triplet combination. The modified protocol for the trial aims to enroll approximately 580 patients with previously untreated, advanced or metastatic RCC of all risk groups. Patients are being randomized 1:1 to receive either 40 mg of cabozantinib daily and 240 mgcontrol arm of nivolumab every 2 weeks, or 50 mg of sunitinib daily on a 4-weeks-on/2-weeks-off schedule.and ipilimumab in combination with matched placebo. The primary endpoint for the trial is PFS, and secondary endpoints include OS and ORR. Based on long-term follow-up results for CheckMate 214, in which the combination of nivolumab and ipilimumab showed a longer median OS compared to original assumptions, we expanded the enrollment target for COSMIC-313 to provide additional power to assess the secondary endpoint is OS. The triplet combination continuesof OS for COSMIC-313. We completed the expanded enrollment of 855 patients in March 2021 and expect to be evaluated in an ongoing phase 1breport top-line results of the event-driven analyses from the trial in patients with advanced genitourinary malignanciesthe first half of 2022. We are sponsoring COSMIC-313, and a separate phase 3 trial evaluating the triplet combination versusBMS is providing nivolumab and ipilimumab is in preparation.
HCC - Checkmate 040
CheckMate 040 is a large, multi-cohort phase 1/2 trial in patients with previously treated and previously untreated advanced HCC, including a cohort evaluating treatment regimens that include cabozantinib in combination with nivolumab or in combination with both nivolumab and ipilimumab. This cohort containing the cabozantinib combination treatment regimens enrolled approximately 30 patients into each of two groups in accordance with the trial protocol, with one group receiving 40 mg of cabozantinib daily and 3 mg of nivolumab every two weeks, and the other group receiving 40 mg of cabozantinib daily, 3 mg of nivolumab every two weeks and 1 mg ipilimumab every six weeks. The primary objectives for the cohorts are safety and tolerability, ORR and durationstudy free of response (DOR) and the secondary objectives include time to progression (TTP), PFS and OS.

charge.
Combination Studies with the Roche Group (Roche)
Diversifying our exploration of cabozantinib combinations with ICIs, in February 2017, we entered into a master clinical supply agreement with F. Hoffmann-La Roche Ltd. (Roche) for the purpose of evaluating cabozantinib and Roche’s anti-PD-L1 ICI, atezolizumab, in locally advanced or metastatic solid tumors. As part of the collaboration,clinical supply agreement, we are evaluating this combination in a phase 1b trial in locally advanced or metastatic tumors, COSMIC-021, and a phase 3 pivotal trial in previously untreated advanced HCC. Depending on resultsInformed by the data generated from the phase 1b trial, COSMIC-021, we may also evaluateentered into a joint clinical research agreement with Roche in December 2019, pursuant to which we are evaluating this combination in various other tumor types, including NSCLC.three late-stage clinical trials: the first, CONTACT-01, focuses on patients with metastatic non-small cell lung cancer (NSCLC) who have been previously treated with an ICI and platinum-containing chemotherapy; the second, CONTACT-02, focuses on patients with metastatic castration-resistant prostate cancer (mCRPC) who have been previously treated with one novel hormonal therapy (NHT); and the third, CONTACT-03, focuses on patients with inoperable, locally advanced or metastatic RCC who have progressed during or following treatment with an ICI as the immediate preceding therapy. For additional information on the terms of the masterjoint clinical supplyresearch agreement, see “—Collaborations—Collaborations and Business Development Activities—Cabozantinib Development Collaborations—Roche.
Locally Advanced or Metastatic Solid Tumors - COSMIC-021
. In June 2017, we initiated COSMIC-021, a phase 1b dose escalation study that is evaluating the safety and tolerability of cabozantinib in combination with Roche’s atezolizumab in patients with locally advanced or metastatic solid tumors. We are the trial sponsor of COSMIC-021, and Roche is providing atezolizumab free of charge.
The study is divided into two parts: a dose-escalation phase, which was completed in 2018; and an expansion cohort phase, which is ongoing. The dose-escalation phase of the trial enrolled 12 patients with advanced RCC, and results were presented at the ESMO 2018 Congress. The primary objective was to determine the optimal dose and schedule of daily oral administration of cabozantinib when given in combination with atezolizumab to inform the trial’s subsequent expansion stage. Cabozantinib doses of 40 mg daily and 60 mg daily were evaluated. All patients received the standard atezolizumab dosing regimen of 1200 mg infusion once every 3 weeks. The dose-escalation phase of the study determined the optimal dose of cabozantinib as 40 mg daily when given in combination with the standard atezolizumab dosing regimen of 1200 mg infusion once every 3 weeks. No dose-limiting toxicities or serious adverse events (AEs) were noted. Dose reductions and higher grade AEs were less frequent with the 40 mg cabozantinib dosing cohort. Encouraging clinical activity was also observed. The safety profile for the combination in the dose-escalation phase of the trial was consistent with the established profile of each combination agent, and no new safety signals have emerged.
Enrollment in the expansion stagephase of this study which is currently ongoing, includes the following eighteen20 combination therapy tumor expansion cohorts:
cohorts in NSCLC, mCRPC, RCC and various other tumor types. Encouraging efficacy and safety data has emerged from the trial and has been instrumental in guiding our clinical development strategy for cabozantinib in combination with ICIs, including supporting the initiation of COSMIC-312, CONTACT-01, CONTACT-02 and CONTACT-03. Moreover, certain cohorts have been expanded, including a cohort of patients with advanced non-squamous NSCLC without a defined tumor genetic alteration (EGFR, ALK, ROS1, or BRAF)mCRPC who have not received prior therapybeen previously treated with an ICI;
patients with NSCLC without a defined tumor genetic alteration who have progressed following treatment with an ICI;
patients with NSCLC with an EGFR mutation who have progressed following treatment with an EGFR-targeting TKI for metastatic disease;
patients with UC who have progressed following treatment with an ICI;
patients with CRPC who have previously received enzalutamide and/or abiraterone acetate and experienced radiographic disease progression in soft tissue;
patients with RCC with clear cell histology who have not had prior systemic anticancer therapy;
patients with RCC with non-clear cell histology who have not had prior systemic anticancer therapy for inoperable, locally advanced, recurrent or metastatic disease;
patients with UC who have progressed on or after platinum-containing chemotherapy;
patients with UC who are ineligible for cisplatin-based chemotherapytissue (Cohort 6) and have not received prior systemic chemotherapy for inoperable, locally advanced or metastatic disease;
patients with UC who are eligible for cisplatin-based chemotherapy and have not received prior systemic chemotherapy for inoperable, locally advanced or metastatic disease;
patients with triple-negative breast cancer (TNBC) who have progressed following treatment with at least one prior systemic therapy for inoperable, locally advanced, recurrent or metastatic disease;
patients with epithelial ovarian cancer (EOC) who have platinum-resistant or refractory disease;
patients with endometrial cancer who have progressed following treatment with at least one prior systemic therapy for inoperable, locally advanced, recurrent or metastatic disease;
patients with advanced HCC who have a Child-Pugh score of A and have not had prior systemic anticancer therapy for inoperable, locally advanced, recurrent or metastatic disease;

patients with gastric or gastroesophageal junction adenocarcinoma who have progressed following treatment with platinum-containing or fluoropyrimidine-containing chemotherapy for inoperable locally advanced, recurrent or metastatic disease;
patients with colorectal adenocarcinoma who have progressed following treatment with systemic chemotherapy that contained fluoropyrimidine in combination with oxaliplatin or irinotecan for metastatic disease;
patients with head and neck cancer of squamous cell histology who have progressed following treatment with platinum-containing chemotherapy for inoperable locally advanced, recurrent or metastatic disease; and
patients with DTC who are radio-refractory or deemed ineligible for treatment with iodine-131.
Each expansion cohort will initially enroll approximately 30 patients, and cohorts may be further expanded, including the cohorts of patients with UC or NSCLC who have been previously treated with an ICI,ICI. Data from Cohort 6, announced in May 2021 and presented at the European Society for Medical Oncology (ESMO) 2021 Congress in September 2021, resulted in an investigator assessed ORR per RECIST v. 1.1 of 23% and a totalblinded independent radiology committee (BIRC) assessed ORR per RECIST v. 1.1 of up15%. Other more detailed results from Cohort 6 were also presented at the ESMO 2021 Congress, including investigator assessed PFS per RECIST v. 1.1 of 5.5 months and BIRC assessed PFS per RECIST v. 1.1 of 5.7 months. While these results show promise, following discussions with the FDA, we will not pursue a regulatory submission for the combination regimen based
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solely on the Cohort 6 results; however, we will continue to 1,000 patients. In addition, there are two exploratory cohorts that will evaluate cabozantinib as a single-agent therapythe combination regimen in patients with NSCLC without a defined tumor genetic alteration andpreviously treated mCRPC in patients with UC, in each case who have progressed following treatment with an ICI.the CONTACT-02 phase 3 pivotal trial.
HCC - COSMIC-312
COSMIC-312. In December 2018, we initiated COSMIC-312, a multicenter, randomized, controlled phase 3 pivotal trial evaluating cabozantinib in combination with atezolizumab versus sorafenib in previously untreated advanced HCC. The co-primary endpoints of the trial are PFS and OS. An exploratoryalso includes a third arm will also evaluateevaluating cabozantinib monotherapy in this first-line setting. The study aimssetting in order to enroll approximately 640 patients at up to 200 sites globally. Patients will be randomized to oneaddress the contribution of three arms: cabozantinib and atezolizumab (40 mg); sorafenib; or cabozantinib (60 mg). The co-primary endpointscomponents for the trial are PFS and OS.
combination therapy. We are sponsoring COSMIC-312, and Ipsen will co-fundis co-funding the trial. Ipsen will have access to the results to support potential future regulatory submissions outside of the U.S. and Japan. Roche is providing atezolizumab free of charge. In August 2020, we announced the completion of patient enrollment in COSMIC-312, providing the requisite patient population to conduct the event-driven analyses of the trial’s two primary endpoints of PFS and OS. Separately, patient enrollment remains open in mainland China in order to enroll a sufficient number of patients to enable local registration, if supported by the clinical data. Patients are being randomized to one of three arms: cabozantinib (40 mg) in combination with atezolizumab; sorafenib; or cabozantinib monotherapy (60 mg). In June and November 2021, we announced results from COSMIC-312, which were presented at the ESMO Asia Virtual Oncology Week in November 2021. The trial met one of the primary endpoints, demonstrating significant improvement in BIRC assessed PFS at the planned primary analysis, reducing the risk of disease progression or death by 37% compared with sorafenib (hazard ration [HR]: 0.63; 99% confidence interval [CI]: 0.44-0.91; P=0.0012; pre-specified critical P-value of 0.01). Median PFS was 6.8 months for cabozantinib in combination with atezolizumab versus 4.2 months for sorafenib. The interim OS analysis performed at the same time did not reach statistical significance (HR: 0.90; 96% CI: 0.69-1.18; P=0.438). Median OS was 15.4 months for cabozantinib in combination with atezolizumab versus 15.5 months for sorafenib. The trial is continuing as planned to the final analysis of OS, anticipated during the first quarter of 2022, and we intend to submit an sNDA to the FDA for the combination regimen if supported by the final OS analysis.
NSCLC - CONTACT-01. Lung cancer is the second most common type of cancer in the U.S., with more than 236,000 new cases expected to be diagnosed in 2022. The disease is the leading cause of cancer-related mortality in both men and women, causing 25% of all cancer-related deaths. The majority (84%) of lung cancer cases are NSCLC, which mainly comprise adenocarcinoma, squamous cell carcinoma and large cell carcinoma. The five-year survival rate for patients with NSCLC is 25%, but that rate falls to just 7% for those with advanced or metastatic disease. Due to the urgent need for treatment options for patients with NSCLC and based on positive early-stage results from COSMIC-021, in June 2020, we and Roche initiated CONTACT-01, a global, multicenter, randomized, open-label phase 3 pivotal trial evaluating cabozantinib in combination with atezolizumab versus docetaxel in patients with metastatic NSCLC who have been previously treated with an ICI and platinum-containing chemotherapy. Patients are randomized 1:1 to the experimental arm of cabozantinib in combination with atezolizumab or to the control arm of docetaxel. The primary endpoint for the trial is OS, and secondary endpoints include PFS, ORR and DOR, in each case per RECIST v. 1.1. In November 2021, we announced the completion of enrollment of 366 patients at 117 sites globally. Based on current event rates, we anticipate announcing results of the interim OS analysis in the second half of 2022. CONTACT-01 is sponsored by Roche and co-funded by us. In addition, both Ipsen and Takeda have opted into and are co-funding the trial, and both companies will have access to the results to support potential future regulatory submissions in their respective territories outside of the U.S.
mCRPC - CONTACT-02. According to the American Cancer Society, in 2022, approximately 268,500 new cases of prostate cancer will be diagnosed, and 34,500 people will die from the disease. Prostate cancer that has spread beyond the prostate and does not respond to androgen-suppression therapies—a common treatment for prostate cancer—is known as mCRPC. Researchers estimate that in 2020, 43,000 men were diagnosed with mCRPC, which has a median survival of less than two years. In response to this significant unmet need and based on positive early-stage results from Cohort 6 of COSMIC-021, in June 2020, we and Roche initiated CONTACT-02, a global, multicenter, randomized, open-label phase 3 pivotal trial evaluating cabozantinib in combination with atezolizumab in patients with mCRPC who have been previously treated with one NHT. The trial aims to enroll approximately 580 patients at approximately 280 sites globally, and we expect to complete enrollment in the second half of 2022. Patients are being randomized 1:1 to the experimental arm of cabozantinib in combination with atezolizumab or to the control arm of a second NHT (either abiraterone and prednisone or enzalutamide). The two primary endpoints for the trial are PFS per RECIST v. 1.1 as assessed by BIRC and OS, and secondary endpoints include ORR, prostate-specific antigen response rate and DOR. CONTACT-02 is sponsored by us and co-funded by Roche. In addition, both Ipsen and Takeda have opted into and are co-funding the trial, and both companies will have access to the results to support potential future regulatory submissions in their respective territories outside of the U.S.
RCC - CONTACT-03. Taking into account the rapidly evolving treatment landscape for RCC and based on positive early-stage results from COSMIC-021, in July 2020, we and Roche initiated CONTACT-03, a global, multicenter, randomized, open-label phase 3 pivotal trial evaluating cabozantinib in combination with atezolizumab versus cabozantinib alone in
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patients with inoperable, locally advanced or metastatic RCC who progressed during or following treatment with an ICI as the immediate preceding therapy. Patients are randomized 1:1 to the experimental arm of cabozantinib in combination with atezolizumab or to the control arm of cabozantinib alone. The two primary endpoints for the trial are PFS per RECIST v. 1.1 as assessed by BIRC and OS, and secondary endpoints include PFS, ORR and DOR as assessed by the investigators. CONTACT-03 is sponsored by Roche and co-funded by us. In addition, both Ipsen and Takeda have the right to opt in and co-fund the trial and if doing so, they will have access to the results to support potential future regulatory submissions in their respective territories outside of the U.S. In January 2022, we announced the completion of enrollment of 523 patients at 168 sites globally. Based on current event rates, we anticipate announcing results of PFS and the first interim OS analysis in the second half of 2022. We intend to use the data from CONTACT-03 to further study the therapeutic potential of cabozantinib in this patient population, both as a single agent and in combination with ICIs.
Other Trials Evaluating Cabozantinib in Combination with other Therapies
RCC - CANTATA: In January 2021 Calithera Biosciences, Inc. (Calithera) announced that the CANTATA trial did not meet its primary endpoint of improving PFS per independent review for Calithera’s teleaglenastat (also known as CB-839) plus cabozantinib as compared with cabozantinib alone in previously treated advanced or metastatic RCC. The HR was 0.94 (p=0.65), and median PFS was 9.2 months among patients treated with telaglenastat and cabozantinib as compared to 9.3 months for patients treated with cabozantinib and placebo. We provided cabozantinib for the trial through a material supply agreement with Calithera.
Trials Conducted through our CRADA with NCI-CTEP and our IST Program
In October 2011, we entered into a CRADA with NCI-CTEP for the clinical development of cabozantinib. Through ourThe CRADA with NCI-CTEP and our IST program we have been able to expandenabled further expansion of the cabozantinib development program while avoiding over-burdeningwith less burden on our internal development resources. OurThis CRADA reflects a major commitment by NCI-CTEP to support the broad exploration of cabozantinib’s potential in a wide variety of cancers, each representing a substantial unmet medical need. Through this mechanism, NCI-CTEP provides funding for as many as 20 active clinical trials of cabozantinib each year for a five-year period. TheWe and NCI-CTEP have extended the term of the CRADA was extended in October 2016 for an additional five-year period through October 2021,2026, provided that both parties maintain the right to terminate the CRADA for any reason upon sixty days’ notice, for an uncured material breach upon thirty days’ notice and immediately for safety concerns. Investigational New Drug (IND) applications for trials under the CRADA are held by NCI-CTEP. NCI-CTEP also retains rights to any inventions made in whole or in part by NCI-CTEP investigators. However, for inventions that claim the use and/or the composition of cabozantinib, we have an automatic option to elect a worldwide, non-exclusive license to cabozantinib inventions for commercial purposes, with the right to sublicense to affiliates or collaborators working on our behalf, as well as an additional, separate option to negotiate an exclusive license to cabozantinib inventions. Further, before any trial proposed under the CRADA may commence, the protocol is subject to our review and approval, and the satisfaction of certain other conditions. WeAs reflected by the results from completed trials and given the numerous ongoing and planned clinical trials, we believe our CRADA with NCI-CTEP has and will enable us to continue to expand the cabozantinib development program broadly in a cost-efficient manner. A summary of key trials under this collaboration is provided below.
Advanced Genitourinary Tumors
Results fromPDIGREE is a phase 3 trial led by The Alliance that is enrolling 1,046 intermediate- or poor-risk advanced RCC patients who have a clear cell component in their tumors. All patients are initially treated with up to 4 cycles of induction ipilimumab combined with nivolumab. Subsequently, patients are treated based on their response to the induction therapy. Patients achieving a complete response (CR) continue on maintenance nivolumab, while patients with progressive disease (PD) are switched to cabozantinib monotherapy. Patients who neither achieve a CR nor develop PD during induction are randomized 1:1 trial evaluating cabozantinibto either maintenance nivolumab or nivolumab in combination with nivolumabcabozantinib 40 mg daily. The primary endpoint is OS, while PFS, CR rate, ORR and safety are among the secondary endpoints.
In February 2021, positive initial results were announced from PAPMET (also known as SWOG S1500), a randomized phase 2 trial conducted by the Southwest Oncology Group evaluating cabozantinib versus sunitinib in patients with previously treated genitourinary tumors being conducted under our CRADAmetastatic papillary RCC. PAPMET met its primary endpoint, demonstrating a statistically significant and clinically meaningful prolongation of PFS, with NCI-CTEPa median PFS of 9.0 months for cabozantinib (95% CI: 6-12) versus 5.6 months for sunitinib (95% CI: 3-7) (HR: 0.60; 95% CI: 0.37-0.97; P=0.019). Detailed results from PAPMET were first presented at the ESMO 2016 Congress in October 2016 and most recently updated at the 2018 ASCOvirtual American Society of Clinical Oncology (ASCO) Genitourinary Cancers Symposium in February 2018. 2021 and published in The updated data reported results from 78 patients treated with either cabozantinib and nivolumab with or without ipilimumab. Forty-nine patients were treated with the doublet combination of cabozantinib and nivolumab and 29 patients were treated with the triplet combination of cabozantinib, nivolumab and ipilimumab. Among the nineteen patients with metastatic UC who were evaluable for response, the ORR across all treatment groups was 42% (2 complete responses (CRs) and 6 PRs of 19 patients) and the DCR (DCR = CR, PR and SD) was 84%. Seven of eight (88%) metastatic UC patients with an objective response had not progressed at the time of the data cut-off. Median PFS in this patient population was 12.8 months and the OS rate at 12 months was 77%. Among the 13 patients with metastatic RCC who were evaluable for response, ORR was 54 percent (7 PRs of 13 patients) and the DCR was 100%. In the overall study the ORR in 64 evaluable patients was 36% (3 CRs and 20 PRs) with a median DOR of 24 months. 78 patients were included in the safety analysis. No dose-limitingLancet.
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toxicity was observed in the study. Based on general tolerability, the recommended cabozantinib dose for the expanded dose cohorts and for future late stage evaluation was determined as cabozantinib at 40 mg daily oral dose combined with nivolumab at 3 mg/kg every 2 weeks and ipilimumab at 1 mg/kg every 3 weeks for 4 doses. The safety profile for the combination in the trial was consistent with the established profile of each combination agent, and no new safety signals have emerged. This phase 1b study supported the choice of dose for the ongoing CheckMate 9ER trial in previously untreated advanced RCC.
DTC
Results from a phase 2 single-arm, open-label trial evaluating cabozantinib for the first-line treatment of metastatic RAI-refractory DTC, an IST conducted by the Center for Rare Cancers and Personalized Therapy at the Abramson Cancer Center of the University of Pennsylvania, were presented at the 2018 Multidisciplinary Head and Neck Cancers Symposium in February 2018. The primary endpoint of the trial was ORR. Patients were administered oral cabozantinib 60 mg once daily. Among the 35 patients who were evaluable for response, PR was achieved by 54% of patients (n=19), and SD was reported in 43 percent of patients (n=15) per RECIST 1.1. All but one evaluated patient experienced a decrease in tumor target lesions. Secondary endpoints of the trial included PFS, TTP, DOR and clinical benefit rate (CBR), defined as the number of patients achieving an objective response or stable disease for at least 6 months. The CBR at six months was 80% (n=28). With a median follow up for the study of 35 weeks, the median PFS had not been reached. The median TTP among those patients who progressed was 35 weeks. The safety profile in the study was consistent with the established profile of cabozantinib and other TKIs. It was on the basis of these encouraging trial results and results from earlier phase 1 and 2 trials in RAI-refractory DTC patients who had received prior systemic therapies that we initiated COSMIC-311.
NSCLC
In November 2014, we announced positive top-line results fromRADICAL is a randomized phase 2 trial being conducted by The Alliance that plans to enroll up to 210 patients with advanced RCC. All patients must have at least 2 sites of cabozantinibbone metastases and erlotinib alone ormay have received up to 2 prior lines of systemic therapy. Patients are randomized 1:1 to be treated with cabozantinib in combination with radium-223 dichloride or cabozantinib as second- or third-line therapy ina single agent. The primary endpoint is symptomatic skeletal event-free survival, while secondary endpoints include PFS, OS, ORR and safety.
Neuroendocrine Tumors
The Alliance is leading the CABINET study that treats patients with stage IV EGFR wild-type NSCLC. This trial (Study E1512) was sponsored through our CRADAwell- or moderately-differentiated neuroendocrine tumors (NETs). CABINET includes 2 separate randomized studies, one for patients with NCI-CTEPpancreatic NETs and was conducted by the ECOG-ACRIN Cancer Research Group.other for patients with carcinoid tumors. The positive results from this trial were reported atplanned enrollment for the ASCO 2015 Annual Meeting in May 2015pancreatic NET study is 185 patients and subsequently published online in Lancet Oncology in November 2016.for the carcinoid study is 210 patients. Both studies randomize previously treated patients 2:1 to cabozantinib 60 mg daily or placebo. The study met its primary endpoint demonstrating significant increasesfor both studies is PFS per Response Evaluation Criteria in PFS for cabozantinib and the combination of cabozantinib plus erlotinib when individually compared to the erlotinib arm. The safety profile for the combination in the trial was consistent with the established profile of other TKI/TKI combination therapies. InformedSolid Tumors 1.1 as determined by these clinical results, we are working with clinical collaborators to explore cabozantinib’s further development in NSCLC, including potential combination approaches with ICIs, such as within one of the expansion cohorts of COSMIC-021, our phase 1b study with Roche evaluating the combination of cabozantinib and atezolizumab.a blinded IRRC.
Other Cancer Indications
ThereOverall, there are 4666 ongoing and 3026 planned externally sponsored trials evaluating the clinical and therapeutic potential of cabozantinib, including those administered through our CRADA with NCI-CTEP and our IST program. Like our CRADA with NCI-CTEP, our IST program helps us to continue to evaluate cabozantinib across a broad range of tumor types.
These externally sponsored trials include signal seeking studies of single-agent cabozantinib, novel combinations, and randomized trials. The monotherapy trials are focused on solid tumors including genitourinary neoplasms, gastrointestinal malignancies, lung cancer and a variety of less common tumor types. The combination studies include trials combining cabozantinib with several different ICIs, as well as studies adding cabozantinib to various other anti-cancer therapies, including monoclonal antibodies and(mAbs), chemotherapeutic agents, small molecules which target specific cellular pathways. Randomizedpathways, or radiation. In addition to the various trials within thedescribed above, our CRADA include aincludes an ongoing randomized phase 32 study in neuroendocrine tumors and phase 2 trials in both endometrial cancerNSCLC, also in combination with checkpoint inhibitors and in prostate cancer in combination with docetaxel.an ICI.
A complete listing of all ongoing cabozantinib trials can be found at www.ClinicalTrials.gov.
Other Development Programs - Advancing Exelixis’ Future Cancer Therapy Candidates
We have advanced several other product candidates into clinical trials during recent years, including both small molecules and biotherapeutics that we have discovered or in-licensed and believe may have the potential to benefit patients with a variety of cancers. The following table summarizes our current and planned clinical development activities outside of the cabozantinib franchise:
CLINICAL DEVELOPMENT PROGRAM FOR PIPELINE
Product
Mechanism of Action

Setting

Status Update
XL092Next-generation tyrosine kinase inhibitor (TKI) targeting MET/VEGFR/AXL/MERAdvanced or metastatic solid tumors
Phase 1b trials evaluating single-agent and immune checkpoint inhibitor (ICI)
combination regimens ongoing
In combination with atezolizumab and with avelumab (STELLAR-001)
In combination with nivolumab, with nivolumab and ipilimumab and with nivolumab and bempegaldesleukin (STELLAR-002)
Potential to initiate late-stage trials in 2022 (including STELLAR-303)
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XB002Next-generation tissue factor (TF)-targeting antibody-drug conjugate (ADC)Advanced solid tumorsPhase 1 trial evaluating single-agent ongoing

Potential to add combination regimens with ICIs and other targeted therapies in 2022
XL102Potent, selective, orally bioavailable cyclin-dependent kinase 7 (CDK7) inhibitorAdvanced or metastatic solid tumors
Phase 1 trial evaluating single-agent
and combination regimens ongoing
In combination with fulvestrant, with abiraterone and prednisone and potentially with other anti-cancer regimens
XL114CARD11-BCL10-MALT1 (CBM) complex inhibitorNon-Hodgkin’s lymphoma (NHL)Phase 1 trial evaluating single-agent planned for first half of 2022
XL092 Development Program
XL092 is theThe first internally-discoveredcompound discovered at Exelixis compound to enter the clinic following the company’s reinitiationour re-initiation of drug discovery activities.activities in 2017 was XL092, is a next-generation oral TKI that targets VEGF receptors, MET, AXL, MER and other kinases implicated in cancer’s growth and spread. The molecule isIn designing XL092, we sought to build upon our experience with cabozantinib, retaining a similar target profile while improving key characteristics, including the subject of an active IND that we submitted to the FDA in December 2018, and that the FDA accepted in January 2019.pharmacokinetic half-life. We are evaluating XL092 will initially be studied in a multi-centergrowing clinical development program across various tumor types.
Advanced Solid Tumors - STELLAR-001. Following the FDA’s acceptance of our IND for XL092, in February 2019, we initiated STELLAR-001, a multicenter phase 1b clinical trial evaluating the pharmacokinetics, safety, tolerability and preliminary anti-tumor activity of XL092. STELLAR-001 is divided into dose-escalation and expansion phases. In October 2020, we presented data at the 32nd EORTC-NCI-AACR (ENA) Symposium that suggest XL092 has a desirable therapeutic profile. We believe it pairs the potential for significant anti-tumor activity with a much shorter clinical pharmacokinetic half-life than cabozantinib, and also presents the potential for synergistic effects in combination with ICIs. In consideration of these data, we amended the phase 1 study protocol in October 2020 to include dose-escalation and expansion cohorts for XL092 in combination with atezolizumab, and again in March 2021 to include dose-escalation and expansion cohorts for XL092 in combination avelumab, an ICI developed by Merck KGaA, Darmstadt, Germany (Merck KGaA) and Pfizer Inc. (Pfizer). We are continuing to enroll patients into the dose-escalation cohorts of the combination part of the trial, and we expect that once recommended doses are established for single-agent XL092, XL092 in combination with atezolizumab and XL092 in combination with avelumab, the trial will begin to enroll expansion cohorts for patients with clear cell and non-clear cell RCC, colorectal cancer (CRC), hormone-receptor positive breast cancer mCRPC and urothelial carcinoma (UC). The primary efficacy endpoints for the expansion phase may include ORR per RECIST v. 1.1 and PFS per RECIST v. 1.1.
Advanced Solid Tumors - STELLAR-002. In December 2021, we initiated STELLAR-002, a multicenter phase 1 clinical trial designed to evaluate its pharmacokinetics,evaluating the safety, tolerability and tolerability. The trialefficacy of XL092 in combination with either nivolumab, nivolumab and ipilimumab, or nivolumab and bempegaldesleukin, an investigational CD122-preferential IL-2–pathway agonist developed by Nektar Therapeutics (Nektar). STELLAR-002 is divided into dose-escalation and expansion phases. The dose-escalation phase of the trial is enrolling patients with advanced solid tumors and will determine the recommended dose in patients for each of the XL092 combination regimens. Depending on the dose-escalation results, STELLAR-002 may enroll expansion cohorts for patients with clear cell and non-clear cell RCC, mCRPC and UC. The primary efficacy endpoint of the expansion phase will be ORR, except for the cohort of patients with mCRPC, for which the primary efficacy endpoint will be duration of radiographic PFS. To better understand the individual contribution of the therapies, treatment arms in the expansion cohorts may include XL092 as a single agent in addition to the ICI combination regimens.
In addition to clinical updates for XL092 expected in 2022, we plan to initiate the first global phase 3 pivotal trial for the compound in the first half of the year, and other pivotal trials may follow throughout the year. This first planned trial, STELLAR-303, will evaluate XL092 in combination with atezolizumab versus regorafenib in patients with metastatic microsatellite stable CRC who have progressed after or are intolerant to the current standard of care. Preclinical data and emerging results from STELLAR-001 for XL092, both alone and in combination with ICIs, reinforce our belief in the
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opportunity for XL092, which pairs a target profile similar to cabozantinib with a potentially significantly improved safety profile. The decision to initiate STELLAR-303 is also supported by data from a CRC cohort of COSMIC-021, our phase 1b study evaluating cabozantinib in combination with atezolizumab, and from CAMILLA, a phase 1 IST evaluating cabozantinib in combination with durvalumab or with durvalumab and tremelimumab. Results from both of these trials were presented at the ASCO Gastrointestinal Cancers Symposium in January 2022. We intend to develop XL092 in novel combination regimens in a broad array of future potential indications where cabozantinib has demonstrated RECIST v. 1.1 anti-tumor activity.
XB002 Development Program
XB002 (formerly ICON-2) is our lead TF-targeting ADC program, which we in-licensed from Iconic, Inc. (Iconic). XB002 is an ADC composed of human mAb against TF that is conjugated to a cytotoxic agent. TF is highly expressed on tumor cells and in the tumor microenvironment, and TF overexpression, while not oncogenic itself, facilitates angiogenesis, metastasis and other processes important to tumor development and progression. After binding to TF on tumor cells, XB002 is internalized, and the cytotoxic agent is released, resulting in targeted tumor cell death. XB002 is a rationally designed next-generation ADC that leverages proprietary linker-payload technology. Based on promising preclinical data, we exercised our exclusive option to license XB002 in December 2020, resulting in our assuming responsibility for all subsequent clinical development of XB002. For additional information on our business development activities with Iconic, see “—Collaborations and Business Development Activities—Research Collaborations, In-licensing Arrangements and Other Business Development Activities—Iconic.” Following the FDA’s acceptance of our IND for XB002, in June 2021, we initiated a multicenter phase 1, open-label clinical trialdesigned to evaluate itssafety, tolerability, pharmacokinetics and preliminary anti-tumor activity in patients with advanced solid tumors. The trial is divided into dose-escalation and cohort-expansion phases. The dose-escalation phase of the trial is enrolling patients with advanced solid tumors, with the primary objective of determining the maximum tolerated dose or recommended dose levels for intravenous infusion of XB002 as a dose for daily oral administration of XL092 suitable for further evaluation.single agent. Assuming positive data from the initial phase of

the trial, the expansioncohort-expansion phase is designed to further explore the selected dose of XL092XB002 in individual tumor cohorts, wherewhich may include forms of NSCLC, cervical cancer, ovarian cancer, UC, squamous cell head and neck cancers, pancreatic cancer, esophageal cancer, mCRPC, triple negative breast cancer and hormone-receptor positive breast cancer, and will evaluate ORR per RECIST v. 1.1 as a primary endpoint as well as XB002’s safety, tolerability and initialpharmacokinetic profile. We expect to provide clinical updates from the ongoing phase 1 study of XB002 during 2022. We also intend to initiate additional dose-escalation and expansion cohorts to evaluate the potential of XB002 in combination with ICIs and other targeted therapies across a wide range of tumor types, including indications other than those currently addressed by commercially available TF-targeted therapies. Since initiating the XB002 phase 1 trial, we amended our exclusive option and license agreement with Iconic in December 2021 to acquire broad rights to use the anti-TF antibody used in XB002 for any application, including conjugated to other payloads, as well as rights within oncology to a number of other anti-TF antibodies developed by Iconic, including for use in ADCs and multispecific biotherapeutics.
For additional information on our business development activities with Iconic, see “—Collaborations and Business Development Activities—Research Collaborations, In-licensing Arrangements and Other Business Development Activities—Iconic.”
XL102 Development Program
XL102 (formerly AUR102) is the lead compound under our research collaboration with Aurigene Discovery Technologies Limited (Aurigene). It is a potent, selective and orally bioavailable covalent inhibitor of CDK7, which is an important regulator of the cellular transcriptional and cell cycle machinery. Based on encouraging preclinical data for XL102, which we and Aurigene presented at the 32nd ENA Symposium in October 2020, we exercised our exclusive option to license XL102 in December 2020, resulting in our assuming responsibility for all subsequent clinical development of XL102. For additional information on our collaboration with Aurigene, see “—Collaborations and Business Development Activities—Research Collaborations, In-licensing Arrangements and Other Business Development Activities—Aurigene.”
Following the FDA’s acceptance of our IND for XL102, in January 2021, we initiated a multicenter phase 1, open-label clinical trialdesigned to evaluate itssafety, tolerability, pharmacokinetics and preliminary anti-tumor activity, wouldboth as a single agent and in combination with other anti-cancer therapies, in up to 298 patients with inoperable, locally advanced or metastatic solid tumors. The trial is divided into dose-escalation and cohort-expansion phases. The dose-escalation phase of the trial is enrolling patients with advanced solid tumors, with the primary objective of determining the maximum tolerated dose or recommended dose levels for daily oral administration of XL102 as a single agent, as well as in combination with fulvestrant for patients with hormone-receptor positive breast cancer and with abiraterone and prednisone for patients with mCRPC. Combinations with other agents may also be evaluated. Assuming positive data from the initial phase of the trial, the cohort-expansion phase is designed to further explore the selected dose of XL102 as a
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single agent and in combination regimens in individual tumor cohorts, including ovarian cancer, triple-negative breast cancer, hormone-receptor positive breast cancer and mCRPC, and will evaluate ORR per RECIST v. 1.1, as well as XL102’s safety, tolerability and pharmacokinetic profile. We expect to provide clinical updates from the ongoing phase 1 study of XL102 during 2022.
XL114 Development Program
XL114 (formerly AUR104) is a novel anti-cancer compound that inhibits activation of the CBM complex, a key component of signaling downstream of B- and T-cell receptors, which promotes B- and T-cell lymphoma survival and proliferation. Constitutive activation of B- or T-cell receptor signaling is a common feature of B-cell and T-cell lymphomas, and therefore we believe CBM is an attractive target for the development of new anti-cancer therapies with the potential to treat lymphoid malignancies. Notably, the CBM complex is downstream of BTK, inhibitors of which are approved therapies for certain B-cell lymphomas. Inhibitors of CBM complex activation may therefore provide options for patients who develop resistance to BTK inhibitors. At the American Association of Cancer Research Annual Meeting in April 2021, Aurigene presented preclinical data (Abstract 1266) demonstrating that XL114 exhibited potent anti-proliferative activity in a large panel of cancer cell lines ranging from hematological cancers to solid tumors with excellent selectivity over normal cells. We exercised our exclusive option to in-license XL114 in October 2021, resulting in our assuming responsibility for all subsequent clinical development, manufacturing and commercialization of XL114. For additional information on our collaboration with Aurigene, see “—Collaborations and Business Development Activities—Research Collaborations, In-licensing Arrangements and Other Business Development Activities —Aurigene.”
The FDA accepted our IND application for XL114 in October 2021, and we plan to initiate a phase 1 clinical trial evaluating the safety, tolerability, pharmacokinetics and preliminary anti-tumor activity of the compound as a monotherapy in patients with non-Hodgkin’s lymphoma (NHL) in the first half of 2022. The trial will be divided into dose-escalation and cohort-expansion phases and will aim to enroll approximately 144 patients with advanced NHL. The dose-escalation phase of the trial will determine the maximum tolerated dose or recommended dose levels for daily oral administration of XL114 as a monotherapy. Assuming positive data from the initial phase of the trial, the cohort-expansion phase will enroll subjects in cohorts with diffuse large cell B-cell lymphoma, chronic lymphocytic leukemia or small lymphocytic lymphoma, and mantle cell lymphoma, and will evaluate ORR based on lymphoma-specific response criteria.
Expansion of the Exelixis Pipeline: Drug Discovery and Business Development ProgramsPipeline
We are actively focused on expandingworking to expand our oncology product pipeline through internal drug discovery efforts, which encompass our diverse small molecule and targetedbiotherapeutics programs exploring multiple modalities and mechanisms of action. This approach provides a high degree of flexibility with respect to target selection and allows us to prioritize those targets that we believe have the greatest chance of yielding impactful therapeutics. As part of our strategy, our drug discovery activities include research collaborations, in-licensing arrangements and other strategic transactions that serve to increase our discovery bandwidth and allow us to access a wide range of technology platforms. We also opened a new laboratory building on our Alameda campus in 2021, effectively tripling our available lab space and significantly enhancing the capacity and capability of our small molecule discovery efforts. As of the date of this Annual Report, we are currently advancing more than 10 discovery programs and expect to progress up to five new development candidates into preclinical development during 2022. In addition, we will continue to engage in business development activities.initiatives with the goal of acquiring and in-licensing promising oncology platforms and assets and then further characterize and develop them utilizing our established preclinical and clinical development infrastructure.
Drug DiscoverySmall Molecule Programs
As we continue to work to maximize the clinical, therapeuticOur small molecule discovery programs are supported by a robust and commercial potential of cabozantinib, we are also working to rebuild our product pipeline by discovering and developing new cancer therapies for patients. From 2000 until 2012, we had an active discovery group that advanced 22 compounds to the IND stage, either independently or with collaboration partners, including cabozantinib and cobimetinib. We built significantexpanding infrastructure, including a library of 4.6 million compounds, and gainedcompounds. We have extensive experience in the identification and optimization of drug candidates against multiple target classes for oncology, inflammation and metabolic diseases.
In 2016, we resumed internalSince our inception in 1994, our drug discovery effortsgroup has advanced 25 compounds to the IND stage, either independently or with the goal of identifying novelcollaboration partners, and promising therapeutic candidatestoday we deploy our drug discovery expertise in medicinal chemistry, tumor biology and pharmacology to advance into clinical trials. Furthest along in thesesmall molecule drug candidates toward and through preclinical development. These efforts is XL092. For additional information on XL092, see “—XL092 Development Program.
Ourare led by our experienced scientists, including some of the same scientists that led the efforts to discover cabozantinib, cobimetinib and esaxerenone, each of which are now commercially distributed drug products. In pursuit of new discovery organization is leveraging that history in a focused and measured manner. We are concentratingdrug discoveries, we concentrate our in-house work on the most demanding and time-sensitive aspects of lead optimization and use contract research organizations to support more routine activities, thereby minimizing our internal footprint
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while still maintaining an agile, competitive approach. We arealso augment our small molecule discovery activities through research collaborations and will continue to be judiciousin-licensing arrangements with other companies engaged in the selection of targets, focusing on those with robust preclinical validation datasets. We remainsmall molecule discovery, including:
STORM Therapeutics LTD (STORM), which is focused on oncology as a therapeutic area,the discovery and prioritize those targets that we believe, for example, are key componentsdevelopment of signaling pathways frequently deregulated in human cancers or are componentsinhibitors of mechanisms that contribute to tumor-mediated immune suppression. We anticipate that our experience identifying high quality lead compounds against a variety of target classes through use of our propriety compound library, coupled with our expertise in medicinal chemistry, tumor biology and pharmacology, will permit us to prosecute competitive and productive discovery programs in areas of high potential.novel RNA modifying enzymes, including ADAR1;
Business Development
We are alsoAurigene, which is focused on augmenting our pipeline by entering into collaborative relationships or in-licensing agreementsthe discovery and development of novel small molecules as therapies for attractive, early-stage oncology assetscancer; and then further developing them utilizing our established and validated clinical development infrastructure. As part of this strategy, in January 2018, we entered into an exclusive collaboration and license agreement with 
StemSynergyTherapeutics, Inc. (StemSynergy) for, which is focused on the discovery and development of novel oncology compounds aimed to inhibit tumor growth by targeting Casein Kinase 1 alpha (CK1α), and the Notch pathway.
For additional information on these research collaborations and in-licensing arrangements related to our small molecule programs, see “—Collaborations and Business Development Activities—Research Collaborations, In-licensing Arrangements and Other Business Development Activities.”
Amongst our small molecule programs, furthest along are XL092, which was discovered at Exelixis, and XL102 and XL114, which were discovered at Aurigene. XL092 and XL102 entered the clinic in 2019 and 2021, respectively, and we plan to initiate a componentphase 1 clinical trial for XL114 in the first half of 2022. For additional information on these clinical trial programs, see “—Exelixis Development Programs—Other Development Programs - Advancing Exelixis’ Future Cancer Therapy Candidates.” In addition, we continue to make progress on multiple, additional lead optimization programs for inhibitors of a variety of targets that we believe play significant roles in tumor growth, and we anticipate that some of these other programs could reach development candidate status in 2022.
Biotherapeutics Programs
We are also focusing our drug discovery activities on discovering and advancing various biotherapeutics that have the Wnt signaling pathway implicatedpotential to become anti-cancer therapies, such as bispecific antibodies, ADCs and other innovative treatments. The great potential of these classes has been evidenced by the multiple regulatory approvals for the commercial sale of ADCs in key oncogenic processes. Additionally, in May 2018,the past several years. To facilitate the growth of these programs, we have established multiple research collaborations and in-licensing arrangements and entered into other strategic transactions that provide us with access to antibodies and binders, which are the starting point for use with additional technology platforms that we employ to generate next-generation ADCs or multispecific antibodies. Our current research collaborations and in-licensing arrangements for biotherapeutics programs include:
WuXi Biologics Ireland Limited, a collaborationwholly owned subsidiary of WuXi Biologics (Cayman) Inc. (individually and license agreement with Invenra, Inc. (Invenra)collectively referred to as WuXi Bio), which is focused on developingleveraging WuXi Bio’s panel of mAbs for the development of ADC, bispecific and certain other novel tumor-targeting biotherapeutics applications;
Adagene Inc. (Adagene), which is focused on using Adagene’s SAFEbodyTM technology to develop novel masked ADCs or other innovative biotherapeutics with potential for improved therapeutic index;
Catalent, Inc.’s wholly owned subsidiaries Redwood Bioscience, Inc., R.P. Scherer Technologies, LLC and Catalent Pharma Solutions, Inc. (individually and collectively referred to as Catalent), which is focused on the discovery and development of multiple ADCs using Catalent’s proprietary SMARTag® site-specific bioconjugation technology;
NBE-Therapeutics AG (NBE), which is focused on the discovery and development of multiple ADCs by leveraging NBE’s unique expertise and proprietary platforms in ADC discovery, including NBE’s SMAC-Technology™ (a site-specific conjugation technology) and novel payloads;
Iconic, which is focused on the advancement of a next-generation biologics, to discoverTF-targeting ADC program in solid tumors; and develop
Invenra, Inc. (Invenra), which is focused on the discovery and development of novel binders and multispecific antibodies for the treatment of cancer.

We have already made considerablesignificant progress under our collaborations with both StemSynergy and Invenrathese arrangements and believe we will continue to do so in 2019.2022 and future years. For example, based on promising preclinical data for XB002, we exercised our exclusive option to license XB002 in December 2020. Following the FDA’s acceptance of our IND for XB002 in April 2021, we initiated a phase 1 clinical trial in June 2021. For additional information on our collaboration with StemSynergy,XB002, see “—Collaborations—StemSynergy Collaboration,Exelixis Development Programs—Other Development Programs - Advancing Exelixis’ Future Cancer Therapy Candidates—XB002 Development Program.Also, as a direct result of these arrangements, we designated XB010, our first ADC advanced internally, as a development candidate in late 2021.
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XB010, which targets the tumor antigen 5T4, incorporates antibodies sourced from Invenra and was constructed using Catalent’s SMARTag site-specific bioconjugation platform.

In addition, in May 2021, we executed an asset purchase agreement with GamaMabs Pharma SA (GamaMabs), under which we will, upon the closing of the asset purchase and subject to certain conditions, acquire all rights, title and interest in GamaMabs’ antibody program directed at anti-Müllerian hormone receptor 2 (AMHR2), a novel oncology target with relevance in multiple forms of cancer. And most recently, in January 2022, we announced an amendment to our May 2019 exclusive option and license agreement with Iconic to acquire broad rights to use the anti-TF antibody used in XB002 for any application, including conjugated to other payloads. For additional information on these specific research collaborations, in-licensing arrangements and other strategic transactions related to our collaboration with Invenra,biotherapeutics programs, see “—Collaborations—Invenra Collaboration.Collaborations and Business Development Activities—Research Collaborations, In-licensing Arrangements and Other Business Development Activities.
Collaborations and Business Development Activities
We are seeking additional, external collaborative relationships around assetshave established multiple collaborations with leading biopharmaceutical companies for the commercialization and technologies that complementfurther development of the cabozantinib franchise. Additionally, we have made considerable progress under our in-house drug discoveryexisting research collaborations and development efforts. These collaborative relationships are aimed at expandingin-licensing arrangements to further enhance our early-stage pipeline and expand our ability to discover, develop and commercialize novel therapies with the goal of providing new treatment options for cancer patients and their physicians.
Collaborations
We have established multiple collaborations with leading pharmaceutical companies for the commercializationexpect to enter into additional, external collaborative relationships around assets and furthertechnologies that complement our drug discovery and clinical development of cabozantinib, as well as with smaller, discovery-focused biotechnology companies to expand our product pipeline. Additionally, in lineefforts. Consistent with our business strategy prior to the commercialization of our first product, COMETRIQ, we also entered into other collaborations with leading pharmaceutical companies including Genentech and Daiichi Sankyo and BMS for other compounds and programs in our portfolio. Under each of our collaborations, we are entitled to receive milestones and royalties or, in the case of cobimetinib, royalties from sales outside the U.S. and a share of profits (or losses) from commercialization in the U.S.

Cabozantinib Commercial Collaborations
Ipsen Collaboration
In February 2016, we entered into a collaboration and license agreement with Ipsen for the commercialization and further development of cabozantinib. Pursuant to the terms ofUnder the collaboration agreement, Ipsen received exclusive commercialization rights for current and potential future cabozantinib indications outside of the U.S., Canada and Japan. The collaboration agreement was subsequently amended on three occasions, including in December 2016 to include commercialization rights in Canada. We have also agreed to collaborate with Ipsen on the development of cabozantinib for current and potential future indications. The parties’ efforts are governed through a joint steering committee and appropriate subcommittees established to guide and oversee the collaboration’s operation and strategic direction; provided, however, that we retain final decision-making authority with respect to cabozantinib’s ongoing development.
In consideration for the exclusive license and other rights contained in the collaboration agreement, including commercialization rights in Canada, Ipsen paid us aggregate upfront payments of $210.0 million.million in 2016. As of December 31, 2018,2021, we achieved aggregate milestone payments of $275.0$462.5 million related to regulatory and commercial progress by Ipsen since the inception of the collaboration agreement, including a milestone paymentspayment during 20182021 of (i) $50.0 million upon the EMA filing and the approval of cabozantinib as a treatment for patients with previously untreated RCC, (ii) $25.0$12.5 million upon Ipsen’s achievementsubmission of $100.0 million of net sales cumulatively over four consecutive fiscal quarters, (iii) $50.0 million upona variation application to the EMA filing and the approval of cabozantinibfor CABOMETYX as a treatment for patients with previously treated, HCC, (iv) $5.0RAI-refractory DTC. In addition, we recorded in license revenues a $100.0 million uponmilestone from Ipsen in connection with the approval by Health Canadaachievement of $400.0 million of net sales of cabozantinib forin the treatmentrelated Ipsen license territory over four consecutive quarters, and we expect to receive the milestone payment in the first quarter of adults with advanced RCC who have received prior VEGF-targeted therapy and (v) $20.0 million upon the initiation of COSMIC-312.2022.
We are also eligible to receive future development and regulatory milestone payments from Ipsen, totaling an aggregate of $84.0$46.5 million upon additional approvals of cabozantinib in future indications and/or jurisdictions, as well as contingent payments of up to $519.5$350.0 million and CAD$26.5 million associated with future sales volume milestones. We will further receive royalties on net sales of cabozantinib by Ipsen outside of the U.S. and Japan. We were initially entitled to receive a tiered royalty of 2% to 12% on the initial $150.0 million of net sales; this amount was reached in the second quarter of 2018. As ofDuring the year ended December 31, 20182021 and going forward, we are entitled to receive a tiered royalty of 22% to 26% on annual net sales, (withwith separate tiers for Canada);Canada; these 22% to 26% royalty tiers reset each calendar year. In Canada, we are entitled to receive a tiered royalty of 22% on the first CAD$30.0 million of annual net sales and a tiered royalty thereafter to 26% on annual net sales; these 22% to 26% royalty tiers for Canada will also reset each calendar year. As of December 31, 2018,2021, we have earned royalties of $36.3$272.1 million on net sales of cabozantinib by Ipsen since the inception of the collaboration agreement.
Consistent
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We received notification that, effective January 1, 2021, Royalty Pharma plc (Royalty Pharma) acquired from GlaxoSmithKline (GSK) all rights, title and interest in royalties on total net sales of any product containing cabozantinib for non-U.S. markets for the full term of the royalty and for the U.S. market through September 2026, after which time U.S. royalties will revert back to GSK. Accordingly, and consistent with our historical agreement with GlaxoSmithKline (GSK),GSK, we are required to pay a 3% royalty to GSKRoyalty Pharma on alltotal net sales of any product incorporating cabozantinib, including net sales by Ipsen.
We are responsible for funding cabozantinib-related development costs for those trials in existence at the time we entered into the collaboration agreement with Ipsen; global development costs for additional trials are shared between the parties, with Ipsen reimbursing us for 35% of such costs, provided Ipsen chooses to opt into such trials. In accordance with the collaboration agreement, Ipsen has opted into and is co-funding:co-funding certain clinical trials, including: CheckMate 9ER; CheckMate 040 (though-9ER, COSMIC-021, COSMIC-311, COSMIC-312, CONTACT-01 and CONTACT-02. With respect to Ipsen’s decision in the second quarter of 2021 to opt into and co-fund COSMIC-311 development costs, Ipsen will not be co-funding the triplet armis now responsible for 35% of the study evaluating cabozantinib with nivolumabglobal development costs of COSMIC-311 and ipilimumab);is obligated to reimburse us for these costs, as well as an additional payment calculated as a percentage of COSMIC-311 development costs, triggered by the dose escalation phase and first eight expansion cohortstiming of COSMIC-021; and COSMIC-312.the exercise of its option.
We remain responsible for manufacturing and supply of cabozantinib for all development and commercialization activities under the collaboration agreement. In connection with the collaboration agreement,Relatedly, we entered into a supply agreement with Ipsen to supply finished and labeled drug product to Ipsen for distribution in the territories outside of the U.S. and Japan for the term of the collaboration agreement as well as a quality agreement that provides respective quality responsibilities for the aforementioned supply. Furthermore, at the time we entered into the collaboration agreement, the parties also entered into a pharmacovigilance agreement, which defines each partner’s responsibilities for safety reporting. The pharmacovigilance agreement also requires us to maintain the global safety database for cabozantinib. To meet our obligations to regulatory authorities for the reporting of safety data from territories outside of the U.S. and Japan from sources other than our sponsored global clinical development trials, we rely on data collected and reported to us by Ipsen.
Unless earlier terminated, earlier, the collaboration agreement has a term that continues, on a product-by-product and country-by-country basis, until the latter of (i)(1) the expiration of patent claims related to cabozantinib, (ii)(2) the expiration of regulatory exclusivity covering cabozantinib or (iii)(3) ten years after the first commercial sale of cabozantinib, other than COMETRIQ. The supply agreement will continue in effect until expiration or termination of the collaboration agreement. The collaboration agreement may be terminated for cause by either party based on uncured material breach of either the collaboration agreement or the supply agreement by the other party, bankruptcy of the other party or for safety reasons. We may terminate the collaboration agreement if Ipsen challenges or opposes any patent covered by the collaboration

agreement. Ipsen may terminate the collaboration agreement if the FDA or EMA orders or requires substantially all cabozantinib clinical trials to be terminated. Ipsen also has the right to terminate the collaboration agreement on a region-by-region basis after the first commercial sale of cabozantinib in advanced RCC in the given region. Upon termination by either party, all licenses granted by us to Ipsen will automatically terminate, and, except in the event of a termination by Ipsen for our material breach, the licenses granted by Ipsen to us shall survive such termination and shall automatically become worldwide, or, if Ipsen were to terminate only for a particular region, then for the terminated region. Following termination by us for Ipsen’s material breach, or termination by Ipsen without cause or because we undergo a change of control by a party engaged in a competing program, Ipsen is prohibited from competing with us for a period of time.
Takeda Collaboration
In January 2017, we entered into a collaboration and license agreement with Takeda. PursuantTakeda, which was subsequently amended on three occasions to, thisamong other things, modify the amount of reimbursements we receive for costs associated with our required pharmacovigilance activities and milestones we are eligible to receive, as well as modify certain cost sharing obligations related to the Japan-specific development costs associated with CONTACT-01 and CONTACT-02. Under the collaboration agreement, Takeda has exclusive commercialization rights for current and potential future cabozantinib indications in Japan, and the parties have agreed to collaborate on the clinical development of cabozantinib in Japan. The operation and strategic direction of the parties’ collaboration is governed through a joint executive committee and appropriate subcommittees.
In consideration for the exclusive license and other rights contained in the collaboration agreement, we received aan upfront payment of $50.0 million upfront nonrefundable payment from Takeda. Effective March 2018,Takeda in 2017. As of December 31, 2021, we amendedhave also achieved regulatory and development milestones in the aggregate of $127.0 million related to regulatory and commercial progress by Takeda since the inception of the collaboration agreement, including milestone payments during 2021 of (1) $20.0 million upon Takeda’s first commercial sale in Japan of CABOMETYX in combination with OPDIVO for the treatment of patients with unresectable or metastatic RCC and (2) $15.0 million in connection with the initiations of CONTACT-01 and CONTACT-02. We are eligible
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to modify the milestones wereceive additional regulatory and development milestone payments, without limit, for additional potential future indications.
We are further eligible to receive under this agreement, and ascommercial milestones, including milestone payments earned for the first commercial sale of December 31, 2018, we are eligible to receive development, regulatory and first-sale milestone paymentsa product, of up to $90.0 million related to both previously treated and previously untreated RCC and previously treated HCC, as well as additional development, regulatory and first-sale milestone payments for potential future indications. The collaboration agreement$119.0 million. We also provides that we are eligible to receive pre-specified payments of up to $83.0 million associated with sales volume milestones and royalties on the net sales of cabozantinib in Japan. We are entitled to receive a tiered royalty of 15% to 24% on the initial $300.0 million of net sales, and following this initial $300.0 million of net sales, we are then entitled to receive a tiered royalty of 20% to 30% on annual net sales thereafter; these 20% to 30% royalty tiers will reset each calendar year. As of December 31, 2021, we have earned royalties of $10.2 million on net sales of cabozantinib by Takeda since the inception of the collaboration agreement.
Consistent with our historical agreement with GSK, we are required to pay a 3% royalty to GSKRoyalty Pharma on alltotal net sales of any product incorporating cabozantinib, including net sales by Takeda.
Except for CONTACT-01 and CONTACT-02, Takeda is responsible for 20% of the costs associated with the global cabozantinib development plan’s current and future trials, provided Takeda opts into such trials, and 100% of costs associated with the cabozantinib development activities that are exclusively for the benefit of Japan. In accordance with the collaboration agreement, Takeda has opted into and is co-funding CheckMate 9ER.-9ER, certain cohorts of COSMIC-021, CONTACT-01 and CONTACT-02.
Pursuant to the terms ofUnder the collaboration agreement, we are responsible for the manufacturing and supply of cabozantinib for all development and commercialization activities under the collaboration agreement. In connection with the collaboration agreement,Relatedly, we entered into a clinical supply agreement covering the supply of cabozantinib to Takeda for the term of the collaboration agreement, as well as a quality agreement that provides respective quality responsibilities for the aforementioned supply. Furthermore, at the time we entered into the collaboration agreement, the parties also entered into a safety data exchange agreement, which defines each partner’s responsibility for safety reporting. This agreement also requires us to maintain the global safety database for cabozantinib. To meet our obligations to regulatory authorities for the reporting of safety data from Japan from sources other than our sponsored global clinical development trials, we rely on data collected and reported to us by Takeda.
Unless earlier terminated, the collaboration agreement has a term that continues, on a product-by-product basis, until the earlier of (i)(1) two years after first generic entry with respect to such product in Japan or (ii)(2) the later of (A) the expiration of patent claims related to cabozantinib and (B) the expiration of regulatory exclusivity covering cabozantinib in Japan. The collaboration agreement may be terminated for cause by either party based on uncured material breach by the other party, bankruptcy of the other party or for safety reasons. For clarity, Takeda’s failure to achieve specified levels of commercial performance, based upon sales volume and/or promotional effort, during the first six years of the collaboration will constitute a material breach of the collaboration agreement. We may terminate the agreement if Takeda challenges or opposes any patent covered by the collaboration agreement. At any time prior to August 1, 2023, the parties may mutually agree to terminate the collaboration agreement if Japan’s Pharmaceuticals and Medical Devices Agency is unlikely to grant any approval of the marketing authorization application (MAA) in any cancer indication in Japan. After the commercial launch of cabozantinib in Japan, Takeda may terminate the collaboration agreement upon twelve months’ prior written notice following the third anniversary of the first commercial sale of cabozantinib in Japan. Upon termination by either party, all licenses granted by us to Takeda will automatically terminate, and the licenses granted by Takeda to us shall survive such termination and shall automatically become worldwide.

Cabozantinib Development Collaborations
BMS
In February 2017, we entered into a clinical trial collaboration agreement with BMS for the purpose of exploring the therapeutic potential of cabozantinib in combination with BMS’s ICIs, nivolumab and/or ipilimumab, to treat a variety of types of cancer. As part of the collaboration, we are evaluating these combinationsthe triplet combination of cabozantinib, nivolumab and ipilimumab as a treatment optionsoption for RCC and HCC in the CheckMate 9ER and CheckMate 040 trials, respectively. We also intend to evaluate these combinations in other phase 3 pivotal trials in various other tumor types, including UC.COSMIC-313 trial. For descriptionsa description of the Checkmate 9ER and Checkmate 040 trials,COSMIC-313 trial, see “—Exelixis Development Programs—Cabozantinib Development Program—Trials Conducted Under our Clinical Collaboration Agreements—Combination Studies with BMS.”
Pursuant to the terms ofUnder the collaboration agreement with BMS, which was subsequently amended on three occasions, each party granted to the other a non-exclusive, worldwide (within the collaboration territory as defined in the collaboration agreement and its supplemental agreements), non-transferable, royalty-free license to use the other party’s compounds in the conduct of each clinical trial. The parties’ efforts are governed through a joint development committee established to guide and oversee the collaboration’s operation. Each trial will beis conducted under a combination IND application, unless otherwise required by a regulatory authority. Each party will beis responsible for supplying finished drug product for the
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applicable clinical trial, and unless otherwise agreed betweenresponsibility for the parties,payment of costs for each such trial will be shared equally betweendetermined on a trial-by-trial basis. Following the parties, unless twoFDA’s approval of CABOMETYX in combination with OPDIVO as a first-line treatment of patients with advanced RCC, we and BMS compounds will be utilized in such trial, in which case BMS will bear two-thirdscommenced the commercial launch of the costs for such study treatment armscombination and we will bear one-third of the costs. Unless earlier terminated, the collaboration agreement will remain in effect until the completion of all clinical trials under the collaboration, all related trial data has been deliveredhave agreed to both partiespursue commercialization and the completion of any then agreed upon analysis. The collaboration agreement may be terminated for cause by either party based on uncured material breach by the other party, bankruptcy of the other party or for safety reasons. Upon termination by either party, the licenses granted to each party to conduct a combined therapy trial will terminate.marketing efforts independently.
Roche
In February 2017, we entered into a master clinical supply agreement with Roche for the purpose of evaluating cabozantinib and Roche’s ICI, atezolizumab, in locally advanced or metastatic solid tumors. Pursuant to the terms ofUnder this agreement with Roche, in June 2017, we initiated COSMIC-021 and in December 2018, we initiated COSMIC-312. We are the trial sponsor of both trials, and Roche is providing atezolizumab free of charge. For descriptions of the COSMIC-021 and COSMIC-312 trials, see “—Exelixis Development Programs—Cabozantinib Development Program—Trials Conducted Under our Clinical Collaboration Agreements—Combination Studies with Roche.”
StemSynergy CollaborationBuilding upon encouraging clinical activity observed in COSMIC-021, in December 2019 we entered into a joint clinical research agreement with Roche for the purpose of further evaluating the combination of cabozantinib with atezolizumab in patients with locally advanced or metastatic solid tumors, including in the CONTACT-01, CONTACT-02 and CONTACT-03 studies. If a party to the joint clinical research agreement proposes any additional combined therapy trials beyond these three ongoing phase 3 pivotal trials, the joint clinical research agreement provides that such proposing party must notify the other party and that if agreed to, any such additional combined therapy trial will become part of the collaboration, or if not agreed to, the proposing party may conduct such additional combined therapy trial independently, subject to specified restrictions set forth in the joint clinical research agreement.
Under the joint clinical research agreement, each party granted to the other a non-exclusive, worldwide (excluding, in our case, territory already the subject of a license by us to Takeda), non-transferable, royalty-free license, with a right to sublicense (subject to limitations), to use the other party’s intellectual property and compounds solely as necessary for the party to perform its obligations under the joint clinical research agreement. The parties’ efforts will be governed through a joint steering committee established to guide and oversee the collaboration and the conduct of the combined therapy trials. Each party will be responsible for providing clinical supply for all combined therapy trials, and the cost of the supply will be borne by such party. The clinical trial expenses for each combined therapy trial agreed to be conducted jointly under the joint clinical research agreement will be shared equally between the parties, and the clinical trial expenses for each additional combined therapy trial not agreed to be conducted jointly under the joint clinical research agreement will be borne by the proposing party, except that the cost of clinical supply for all combined therapy trials will be borne by the party that owns the applicable product.
Unless earlier terminated, the joint clinical research agreement provides that it will remain in effect until the completion of all combined therapy trials under the collaboration, the delivery of all related trial data to both parties, and the completion of any then agreed-upon additional analyses. The joint clinical research agreement may be terminated for cause by either party based on any uncured material breach by the other party, bankruptcy of the other party or for safety reasons. Upon termination by either party, the licenses granted to each party will terminate upon completion of any ongoing activities under the joint clinical research agreement.
XL092 Clinical Collaborations
In January 2018,an effort to diversify our exploration of the therapeutic potential of XL092, we have also entered into multiple supply agreements to evaluate XL092 in various combination trials, including with Roche’s atezolizumab, Merck KGaA and Pfizer’s avelumab, BMS’ nivolumab and ipilimumab and Nektar’s bempegaldesleukin. These supply agreements will facilitate the efficient exploration of the safety and efficacy of XL092 in combinations with a variety of established cancer therapies as we continue to build a broad development program for XL092. For descriptions of our ongoing clinical trials evaluating XL092 in combination with other therapies, see “—Exelixis Development Programs—Other Development Programs - Advancing Exelixis’ Future Cancer Therapy Candidates—XL092 Development Program.”
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Research Collaborations, In-licensing Arrangements and Other Business Development Activities
STORM
In October 2021, we entered into an exclusive collaboration and license agreement with StemSynergySTORM to discover and advance novel drug candidates intended for the treatment of cancer. Our collaboration focuses initially on the RNA modifying enzyme ADAR1, building on early work by STORM applying its proprietary RNA epigenetic platform, as well as exploring an additional undisclosed target. Under the agreement, we made an upfront payment in exchange for exclusive licenses to these two discovery programs. STORM is responsible for discovery and generation of lead candidates for both target programs, and we will assume responsibility for IND-enabling studies and all subsequent clinical development, manufacturing and commercialization activities.STORM is eligible for potential development, regulatory and commercial milestone payments, as well as royalties on potential sales. We have also committed to contribute research funding to STORM for discovery and preclinical development work for each program.
GamaMabs
In May 2021, we entered into an asset purchase agreement with GamaMabs to acquire all rights, title and interest in GamaMabs’ AMHR2 antibody program. Under the agreement, we made an upfront payment in exchange for an initial technology transfer of certain materials and documents, additional payments for subsequent technology transfers and will make a final payment upon the closing of the transaction. As a result of the transaction, we will own or control 100% of GamaMabs’ AMHR2 antibody program, including all assets pertaining to GamaMabs’ mAb drug product murlentamab (GM-102). GamaMabs is eligible for potential development and regulatory milestone payments.
WuXi Bio
In March 2021, we entered into an exclusive license agreement with WuXi Bio to support the continued expansion of our oncology biotherapeutics pipeline by leveraging WuXi Bio’s panel of mAbs for the development of ADC, bispecific and certain other novel tumor-targeting biotherapeutics applications. Under the agreement, we made an upfront payment in exchange for an exclusive license to a panel of mAbs directed to a preclinically validated target discovered using WuXi Bio’s integrated technology platforms. We will assume responsibility for all subsequent clinical development, manufacturing and commercialization activities under the agreement.WuXi Bio is eligible for potential development, regulatory and commercial milestone payments, as well as royalties on potential sales.
Adagene
In February 2021, we entered into a collaboration and license agreement with Adagene to utilize Adagene’s SAFEbody technology platform to generate masked versions of mAbs from our growing preclinical pipeline for the development of ADCs or other innovative biotherapeutics against Exelixis-nominated targets. Under the agreement, we made an upfront payment in exchange for an exclusive, worldwide license to develop and commercialize any potential ADC products generated by Adagene with respect to an initial target, as well as a second target we may nominate during the collaboration term. For each target that we nominate, we would then assume responsibility for all subsequent clinical development, manufacturing and commercialization for that program.Adagene is eligible for potential development, regulatory and commercial milestone payments, as well as royalties on potential sales .
Catalent
In September 2020, we entered into a collaboration and license agreement with Catalent to develop multiple ADCs using Catalent’s proprietary SMARTag site-specific bioconjugation technology. Under the agreement, we made an upfront payment in exchange for an exclusive option to license up to four targets using Catalent’s ADC platform over a three-year period. In addition, we have the right to extend the target selection term to five years and nominate up to two additional targets for an additional payment. For each option we decide to exercise, we will be required to pay an exercise fee, and we would then assume responsibility for all subsequent clinical development, manufacturing and commercialization for that program. Catalent would then become eligible for potential development, regulatory and commercial milestone payments, as well as royalties on potential sales. We have also committed to contribute research funding to Catalent for discovery and preclinical development work.
NBE
In September 2020, we entered into a collaboration and license agreement with NBE to discover and develop multiple ADCs for oncology applications by leveraging NBE’s unique expertise and proprietary platforms in ADC discovery,
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including NBE’s SMAC-Technology and novel payloads. Under the Agreement, we made an upfront payment in exchange for exclusive options to nominate four targets using NBE’s ADC platform over a two-year period. In addition, within the first 18 months of the agreement term, we also have the right to extend the target selection term to three years for an additional payment. For each option we decide to exercise, we will be required to pay an exercise fee, and we would then assume responsibility for all subsequent clinical development, manufacturing and commercialization connected with any resulting program. NBE would then become eligible for potential development, regulatory and commercial milestone payments, as well as royalties on potential sales. We have also committed to contribute research funding to NBE for discovery and preclinical development work.
Aurigene
In July 2019, we entered into an exclusive collaboration, option and license agreement with Aurigene to in-license as many as six oncology target programs to discover and develop small molecules as therapies for cancer, and in April 2021, we expanded the collaboration to include three additional early discovery programs for a total of nine programs. Under the agreement, we made upfront payments in exchange for exclusive options to license eight of the nine programs to date, and we will pay an additional upfront payment upon the nomination of the ninth program. Based on encouraging preclinical data for XL102, the lead Aurigene program targeting CDK7, we exercised our exclusive option to license XL102 in December 2020, resulting in our assuming responsibility for all subsequent clinical development, manufacturing and commercialization of XL102 and payment of an exercise fee to Aurigene. We also submitted an IND for XL102 in November 2020, and following the FDA’s acceptance of the IND in December 2020, we initiated a phase 1 clinical trial of XL102 in January 2021 designed to evaluate its pharmacokinetics, safety, tolerability and preliminary efficacy, both as a single agent and in combination with other anticancer therapies. For additional information on XL102, see “—Exelixis Development Programs—Other Development Programs - Advancing Exelixis’ Future Cancer Therapy Candidates—XL102 Development Program.” In addition, we exercised our exclusive option to in-license XL114, Aurigene’s novel CBM inhibitor, in October 2021, resulting in our assuming responsibility for all subsequent clinical development, manufacturing and commercialization of XL114 and payment of an option exercise fee to Aurigene. Following the FDA’s acceptance of our IND application for the small molecule in October 2021, we plan to initiate a phase 1 clinical trial evaluating XL114 as a monotherapy in patients with NHL in the first half of 2022. For additional information on XL114, see “—Exelixis Development Programs—Other Development Programs - Advancing Exelixis’ Future Cancer Therapy Candidates—XL114 Development Program.” With respect to each of XL102 and XL114, Aurigene is eligible for potential development, regulatory and commercial milestone payments, as well as royalties on potential sales.
Beyond XL102 and XL114, we are continuing to work with Aurigene to advance the other small molecule programs through preclinical development. For each additional option we decide to exercise, we will be required to pay an exercise fee, and we would then assume responsibility for all subsequent clinical development, manufacturing and commercialization for that program. Aurigene would then become eligible for potential development, regulatory and commercial milestone payments, as well as royalties on potential sales. We are also responsible for research funding for the discovery and preclinical development of novel oncology compounds targeting CK1α, a component of the Wnt signaling pathway implicated in key oncogenic processes. Activation of β-catenin, a key downstream component of the pathway, is increased in multiple tumors, including a majority of colorectal cancers, where mutations in the APC gene that result in β-catenin stabilization are prevalent. Compounds targeting CK1α have also been shown to induce degradation of β-catenin and pygopus, another member of the pathway, in preclinical CRC models, and to inhibit the growth of tumors. Importantly, their GI-sparing qualities may help overcome limitations of other approaches targeting the Wnt pathway.work on these programs. Under the terms ofagreement, Aurigene retains limited development and commercial rights for India and Russia.
Iconic
In May 2019, we entered into an exclusive option and license agreement with Iconic to advance an innovative next-generation ADC program for cancer, leveraging Iconic’s expertise in targeting TF in solid tumors. Under the original May 2019 agreement, we will partner with StemSynergygained an exclusive option to conduct preclinical and clinical studies with compounds targeting CK1α. We paid StemSynergylicense XB002, Iconic’s lead TF ADC program, in exchange for an upfront payment of $3.0 millionto Iconic and a commitment for preclinical development funding. Based on encouraging preclinical data, we exercised our exclusive option to license XB002 in initial research and development funding, and we plan to provide StemSynergy with additional research and development funding of up to $1.2 million during 2019 on an as needed basis. StemSynergy will also be eligibleDecember 2020, resulting in our assuming responsibility for up to $56.5 million in milestones for the first product to emerge from the collaboration, including preclinical andall subsequent clinical development, manufacturing and regulatory milestone payments, commercial milestones,commercialization for XB002 and payment of an option exercise fee to Iconic. Following the FDA’s acceptance of our IND for XB002 in April 2021, we initiated a phase 1 clinical trial of XB002 in June 2021 designed to evaluate its pharmacokinetics, safety, tolerability and preliminary efficacy as a monotherapy in patients with advanced solid tumors. For additional information on XLB002, see “—Exelixis Development Programs—Other Development Programs - Advancing Exelixis’ Future Cancer Therapy Candidates—XB002 Development Program.”
In January 2022, we announced an amendment to our agreement with Iconic, which we entered into in December 2021, to acquire broad rights to use the anti-TF antibody used in XB002 for any application, including conjugated to other payloads, as well as single-digit royalties on worldwide sales. Werights within oncology to a number of other anti-TF antibodies developed by Iconic, including for use in ADCs and multispecific biotherapeutics. Under the amended agreement, we made a final payment to Iconic and will not
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owe Iconic any further payments, but we will continue to be solely responsible for the commercialization of products that arise from the collaboration.milestone payments and royalties owed to other companies pursuant to prior agreements between Iconic and those companies.
Invenra Collaboration
In May 2018, we entered into a collaboration and license agreement with Invenra which is focused on developing next-generation biologics, to discover and develop multispecific antibodies for the treatment of cancer. Invenra is responsible for antibody lead discovery and generation while we will lead IND-enabling studies, manufacturing, clinical development in single-agent and combination therapy regimens, and future regulatory and commercialization activities. The collaboration agreement also provides that we will receive an exclusive, worldwide license to one preclinical, multispecific antibody asset, and that we will pursue up to sixmultiple additional discovery projects across three different programs during the term of the collaboration, which in total are directed to three discovery programs.

collaboration. In consideration for the exclusive worldwide license and other rights contained in the collaboration agreement, we paid Invenra an upfront payment of $2.0 million and a project initiation fee of $2.0 million. In JanuaryOctober 2019, we initiatedexpanded our secondcollaboration to include the development of novel binders against six additional targets, which we can use to generate multispecific antibodies based on Invenra’s B-BodyTM technology platform, or with other platforms and formats at our option. We amended the agreement again in March 2020 and January 2021 to enable the use of target binders in non-Invenra platform-based modalities, such as ADC platforms, and to enable the development of biparatropic antibodies, respectively. Then in August 2021, we further expanded our collaboration to include an additional 20 targets for biotherapeutics discovery project,and development, for which we paid an additional project initiation fee of $2.0 million.agreed to pay Invenra exclusivity payments and research program funding over a three-year period.
Under the collaboration, Invenra is eligible to receive payments of up to $131.5 million based on the achievement of specificfor project initiation fees and potential development, regulatory and regulatory milestones for a product containing the lead preclinical asset in the first indication. Upon successful commercialization of a product, Invenra is eligible to receive globalcommercial milestone payments, up to $325.0 million if certain sales thresholds are achieved as well as single-digit tiered royalties on net sales of theany approved product.products. We also have the right to initiate four additional discovery projectsexercise options with respect to certain of Invenra’s other research programs in exchange for development subject to an upfrontoption exercise payment, of $2.0 millionand Invenra is eligible for each project, as well as additional global milestone payments and royalties for any products that arise from these optioned research programs.
StemSynergy
In January 2018, we entered into an exclusive collaboration and license agreement with StemSynergy for the discovery efforts.
Unless earlier terminated,and development of novel oncology compounds targeting CK1α, a component of the collaborationWnt signaling pathway implicated in key oncogenic processes, including in colorectal cancers. One such compound, EXEL-4329, reached development candidate status in 2021. In May 2021, we amended the agreement hasto provide for an additional research platform to explore inhibitors of the Notch pathway, a termmajor developmental pathway that continues,regulates cancer stem cells in Notch-driven cancers, such as certain types of T-cell lymphomas and esophageal adenocarcinomas. Under the agreement, we paid StemSynergy upfront payments in each of 2018 and 2021, and StemSynergy is eligible for additional research and development funding on a product-by-productan as needed basis. StemSynergy is also eligible for potential development, regulatory and country-by-country basis, untilcommercial milestone payments, as well as royalties on potential sales. We will be solely responsible for the latercommercialization of (i) ten years afterproducts that arise from the first commercial sale of such product in such country or (ii) expiration of patent claims covering the product in such country. We may terminate the collaboration agreement in its entirety or on a project-by-project basis at any time prior to commercialization, for any or no reason, upon thirty days’ written notice to Invenra. The collaboration agreement also may be terminated by either party for a material breach by the other, subject to notice and cure provisions.collaboration.
Other Collaborations
Prior to the commercialization of our first product, COMETRIQ, our primary business strategy was focused on the development and out-license of compounds to pharmaceutical and biotechnology companies under collaboration agreements that allowed us to retain economic participation in compounds and support additional development of our proprietary products. Our collaboration agreements with Genentech and Daiichi Sankyo and BMS described below are representative of this historical strategy. We have since evolved and are now a fully-integrated biopharmaceutical company focused on driving the expansion and depth of our product offerings through the continued development of the cabozantinib internalfranchise and drug discovery efforts, including research collaborations, in-licensing arrangements and execution ofother strategic transactions that align with our oncology drug development, regulatory and commercialization expertise, all to improve care and outcomes for people with cancer around the world. While the historical collaboration agreements described below have the potential to provide future revenue, and while we have already received some collaboration revenues from these arrangements, we do not expect to receive significant revenues from these historical collaboration agreements unless and until our partnered compounds generate substantial sales in the territories and indications where they are approved, or if not yet approved, enter late-stage clinical development.approved. If these events occur, then the milestone payments, royalties or other rights and benefits under our historical collaboration agreements could become substantial.
Genentech - Cobimetinib
In December 2006, we out-licensed the further development and commercialization of cobimetinib to Genentech pursuant to a worldwide collaboration agreement. Cobimetinib is a reversible inhibitor of MEK, a kinase that is a
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component of the RAS/RAF/MEK/ERK pathway. This pathway mediates signaling downstream of growth factor receptors, and is prominently activated in a wide variety of human tumors. Under the terms of the collaboration agreement, we developed cobimetinib through the determination of the maximum tolerated dose in a phase 1 clinical trial, and Genentech had the option to co-develop cobimetinib, an option that Genentech exercised, and in March 2009, we granted to Genentechreceived an exclusive worldwide revenue-bearing license to cobimetinib at which point Genentech becameand is responsible for completingall future clinical development of the phase 1 clinical trial and subsequent clinical development. We received aggregate upfront and milestone payments of $50.0 million under our collaboration agreement with Genentech and are not eligible for any additional milestone payments.
compound. On November 10, 2015, the FDA approved cobimetinib, under the brand name COTELLIC, in combination with Genentech’s ZelborafZELBORAF (vemurafenib) as a treatment for patients with BRAF V600E or V600K mutation-positive advanced melanoma. COTELLIC in combination with ZelborafZELBORAF has also been approved in Switzerland, the EU, Canada, Australia, Brazil and multiple additional countries for use in the same indication. Prior toOn July 30, 2020, the FDA’s approval of COTELLIC, in November 2013, we exercised an option under the collaboration agreement to co-promote COTELLIC in the U.S., which allows for us to provide up to 25% of the total sales force forFDA approved cobimetinib indications in the U.S. Between November 2015 and December 2017, we fielded 25% of the sales force promoting COTELLIC, in combination with Zelboraf as aGenentech’s ZELBORAF and TECENTRIQ® (atezolizumab) for the treatment for patients withof BRAF V600 mutation-positive advanced melanoma in the U.S. However, following a review of the commercial landscape, commencing in January 2018, we and Genentech scaled back the personal promotion of COTELLIC in this indication in the U.S. This decision is not indicative of any change in our intention to promote COTELLIC for other therapeutic indications for which it may be approved in the future.

Cobimetinib Profit Sharing and Royalty Revenuespreviously untreated patients.
Under the terms of our collaboration agreement, as amended in July 2017, we share in the profits and losses received or incurred in connection with COTELLIC’s commercialization in the U.S. This profit and loss share has multiple tiers: we receive 50% of profits and losses from the first $200.0 million of U.S. actual sales, decreasing to 30% of profits and losses from U.S. actual sales in excess of $400.0 million. These tiers will reset each calendar year. The revenue for each sale of COTELLIC applied to the profit and loss statement for the collaboration agreement (Genentech Collaboration P&L) is calculated using the average of the quarterly net selling prices of COTELLIC and any additional branded Genentech product(s) prescribed with COTELLIC in such sale. U.S. commercialization costs for COTELLIC are then applied to the Genentech Collaboration P&L, subject to reduction based on the number of Genentech products in any given combination including COTELLIC. In addition to our profit share in the U.S., under the terms of the collaboration agreement, we are entitled to low double-digit royalties on net sales of COTELLIC outside the U.S. During 2018,2021, we earned royalties of $5.6$4.1 million on net sales of COTELLIC outside the U.S. and a $8.1 million profit on the profit and loss sharing of U.S. actual sales which are recorded in Collaborationcollaboration services revenues.
Unless earlier terminated, Since the inception of the collaboration agreement, has a term that continues until the expirationwe have also received aggregate upfront and milestone payments of the last payment obligation with respect to the licensed products under the collaboration. Genentech has the right to terminate the collaboration agreement without cause at$50.0 million and are not eligible for any time. If Genentech terminates the collaboration agreement without cause, all licenses that were granted to Genentech under the agreement terminate and revert to us. Additionally, if Genentech terminates the collaboration agreement without cause, or we terminate the collaboration agreement for cause, we would receive, subject to certain conditions, licenses from Genentech to research, develop and commercialize reverted product candidates. The collaboration agreement may be terminated for cause by either party based on uncured material breach by the other party.
Cobimetinib Clinical Development Programadditional milestone payments.
In addition to its established commercialization of COTELLIC, Genentech continues to make significant progress with respect to the clinical development, regulatory status and commercial potential of cobimetinib. Cobimetinib is being evaluated in a broad development program consisting of more than 50multiple clinical trials by Genentech or through Genentech’s investigator sponsored trial program, including two phase 3 pivotal trials currently underway exploring the combination of cobimetinib with atezolizumab or atezolizumab alone in BRAF wild type melanoma (IMspire170) and the combination of cobimetinib with atezolizumab and vemurafenib in BRAF V600 mutant melanoma (IMspire150). Additionally, although IMblaze370, a third phase 3 pivotal trial conducted by Genentech evaluating the combination of cobimetinib with atezolizumab in CRC did not meet its primary endpoint as announced in May 2018, Genentech continues to pursue the cobimetinib development program and is conducting a series of early-stage clinical trials investigating the combination of cobimetinib and atezolizumab in multiple tumor settings.IST program. Should these trials prove positiveyield supporting data and Genentech obtain regulatory approvals based on such positive results,supporting data, we believe that cobimetinib couldmay provide us with a potentially meaningfulan additional source of revenue in the future.
MelanomaDaiichi Sankyo - coBRIM. In July 2014, we announced positive top-line results from coBRIM, the phase 3 pivotal trial conducted by Genentech evaluating cobimetinib in combination with vemurafenib in previously untreated patients with unresectable locally advanced or metastatic melanoma harboring a BRAF V600E or V600K mutation. The primary endpoint was investigator-determined PFS, and secondary endpoints included OS, ORR, IRRC-determined PFS and DOR. coBRIM met its primary endpoint, demonstrating a statistically significant increase in investigator-determined PFS. The median PFS was 9.9 months for the combination of cobimetinib and vemurafenib versus 6.2 months for vemurafenib alone. The median PFS as established by an IRRC, a secondary endpoint, was 11.3 months for the combination arm compared to 6.0 months for the control arm. ORR, another secondary endpoint, was 68% for the combination versus 45% for vemurafenib alone. Data were published in the NEJM and presented at the ESMO 2014 Congress in September 2014.Updated results for PFS and ORR from coBRIM were then presented at the ASCO 2015 Annual Meeting in June 2015 and showed a median PFS of 12.3 months for the combination of cobimetinib and vemurafenib versus 7.2 months for vemurafenib alone, and an ORR of 70% for the combination of vemurafenib and cobimetinib versus 50% for vemurafenib alone. In November 2015, we announced that the coBRIM trial also met its OS secondary endpoint, demonstrating a statistically significant increase in OS for the combination of cobimetinib and vemurafenib compared to vemurafenib monotherapy. The median OS was 22.3 months for the combination of cobimetinib and vemurafenib versus 17.4 months for vemurafenib alone. The safety profile of the combination was consistent with that observed in a previous study.
CoBRIM served as the basis for the regulatory approval of COTELLIC in combination with Zelboraf as a treatment for patients with BRAF V600E or V600K mutation-positive advanced melanoma in the U.S., Switzerland, the EU, Canada, Australia, Brazil and other countries.

Melanoma - IMspire150. In January 2017, Genentech initiated IMspire150, a phase 3 pivotal trial evaluating the combination of cobimetinib, vemurafenib and atezolizumab vs. cobimetinib plus vemurafenib in previously untreated BRAF V600 mutation positive patients with metastatic or unresectable locally advanced melanoma. This trial, which has a primary endpoint of PFS, was based on the results of Genentech’s ongoing phase 1b trial in the same patient population. The trial completed enrollment of approximately 500 patients in April 2018. Genentech has announced that top-line results are expected during 2019, and should the results prove positive, Genentech also intends to submit regulatory filings for this combination in 2019.
Melanoma - IMspire170. In October 2017, Genentech initiated IMspire170, a phase 3 trial comparing cobimetinib plus atezolizumab to pembrolizumab in previously untreated BRAF WT patients with metastatic or unresectable locally advanced melanoma. IMspire170 was based on the results of Genentech’s ongoing phase 1b trial in the same patient population. This trial, which has a primary endpoint of PFS, is designed to enroll 450 patients; the first patient was enrolled in December 2017. Genentech has announced that top-line results for the trials are expected during 2019, and should the results prove positive, Genentech also intends to submit regulatory filings for this combination in 2019.
Other Cancer Indications. In addition to IMspire150 and IMspire170, additional earlier-stage clinical trials are ongoing studying the combination of cobimetinib with a variety of agents in multiple tumor types. These include:
the combination of cobimetinib and vemurafenib in additional melanoma patient populations and settings;
a phase 2 trial of cobimetinib in combination with taxanes, with or without atezolizumab in first-line TNBC (COLET);
Phase 2 studies of cobimetinib in combination with atezolizumab in RCC, head and neck squamous cell carcinoma, UC and hormone receptor positive, HER2 negative breast cancer;
Phase 1/2 studies of cobimetinib in combination with atezolizumab in melanoma and NSCLC, in combination with vemurafenib and atezolizumab in melanoma, and in combination with venetoclax in relapsed or refractory acute myeloid leukemia and multiple myeloma;
a phase 1b study evaluating the safety, tolerability and pharmacokinetics of cobimetinib in combination with atezolizumab and bevacizumab in patients with metastatic CRC; and
a phase 1b/2 study of cobimetinib in combination with atezolizumab (one arm of a randomized umbrella study) in metastatic pancreatic ductal adenocarcinoma.
A complete listing of all ongoing cobimetinib trials can be found at www.ClinicalTrials.gov.
Daiichi SankyoEsaxerenone
In March 2006, we entered into a collaboration agreement with Daiichi Sankyo for the discovery, development and commercialization of novel therapies targeted against the MR, a nuclear hormone receptor implicated in a variety of cardiovascular and metabolic diseases. Under the terms of thecollaboration agreement, we granted to Daiichi Sankyo an exclusive, worldwide license to certain intellectual property primarily relating to compounds that modulate MR, including esaxerenone, an oral, non-steroidal, selective MR antagonist. Daiichi Sankyo is responsible for all further preclinical and clinical development, regulatory, manufacturing and commercialization activities for the compounds and we do not have rights to reacquire such compounds, except as described below. Duringcompounds.
In January 2019, the research term, which concluded in November 2007, we jointly identified drug candidates with Daiichi Sankyo for further development. Esaxerenone is the only remaining drug candidate identifiedJapanese MHLW first approved esaxerenone under the collaboration that continues to be developed by Daiichi Sankyo, and we are entitled to receive payments upon attainment of pre-specified development, regulatory and commercialization milestones for esaxerenone
In September 2017, Daiichi Sankyo reported positive top-line results from ESAX-HTN,brand name MINNEBRO, as a phase 3 pivotal trial of esaxerenone, and submitted a Japanese regulatory application for esaxerenone for antreatment essential hypertension indication in February 2018, for which we received a $20.0 million milestone payment, which we recorded in the first quarter of 2018. Data from ESAX-HTN were published in the Journal of Hypertension in June 2018. Daiichi Sankyo’s application was then approved by the Japanese Ministry of Health, Labour and Welfare (MHLW) in January 2019, and the first commercial sale of the branded esaxerenone product MINNEBRO in Japan will trigger the payment of a $20.0 million milestone payment to us.. As of December 31, 2018, and after giving effect to the milestone payment associated with the Japanese regulatory application for esaxerenone,2021, we have achievedreceived an aggregateaggregate of $45.5$65.5 million in development,development, regulatory and commercialization milestone payments related to MINNEBRO over the life of the collaboration agreement. Weagreement and are eligible to receive additional commercialization milestone payments of up to $110.0 million, including the $20.0 million milestone payment associated with the first commercial sale of MINNEBRO in Japan. In addition, we$90.0 million. We are also entitled to receivereceive low double-digit royalties on sales of MINNEBRO. As of December 31, 2021, we have earned royalties of $5.3 million on net sales of MINNEBRO by Daiichi Sankyo may terminatesince the agreement upon 90 days’ written notice,approval of MINNEBRO in which case Daiichi Sankyo’s payment obligations would cease, its license relating to compounds that modulate MR would terminate and revert to us and we would receive, subject to certain terms and conditions, licenses from Daiichi Sankyo to research,

develop and commercialize compounds that were discovered under the collaboration. In addition, pursuantJanuary 2019. Pursuant to a license agreement we entered into with Ligand Pharmaceuticals, Inc. (Ligand), we are required to pay a royalty of 0.5% to Ligand on net sales of MINNEBRO.
Daiichi Sankyo also continues to advancehas further advanced the development program for esaxerenone, with an ongoingand in November 2019, Daiichi Sankyo announced positive results from a phase 3 pivotal trial evaluating esaxerenone as a treatment option for patients in Japan with diabetic nephropathy. Should this trial prove positive and Daiichi Sankyo obtain regulatory approval based on such positivethese results, and taking into account the approval of MINNEBRO by the MHLW in January 2019 for the treatment of hypertension and Daiichi Sankyo’s subsequent commercial sales of MINNEBRO, we believe that esaxerenone willmay provide an additional source of revenue in the future.
BMS - ROR Collaboration Agreement
In October 2010, we entered into a worldwide collaboration with BMS pursuant to which each party granted to the other certain intellectual property licenses to enable the parties to discover, optimize and characterize ROR antagonists that may subsequently be developed and commercialized by BMS. Under the terms of the collaboration agreement, we were responsible for activities related to the discovery, optimization and characterization of the ROR antagonists during the collaborative research period which began on October 8, 2010 and ended on July 8, 2013. Since the end of the collaborative research period, BMS has and will continue to have sole responsibility for any further research, development, manufacture and commercialization of products developed under the collaboration and will bear all costs and expenses associated with those activities.
For each product developed by BMS under the collaboration, we will be eligible to receive payments upon the achievement by BMS of development and regulatory milestones. As of December 31, 2017, we have earned aggregate development and regulatory milestones of $12.5 million, including a $2.5 million development milestone payment in February 2017 in connection with the achievement of certain preclinical milestones set forth in the collaboration agreement and a $10.0 million regulatory milestone payment in October 2017 in connection with BMS’s filing of a Clinical Trial Authorization in Europe for a first in-human study of an RORγ inverse agonist. We are eligible for additional development and regulatory milestone payment of up to $240.0 million in the aggregate and commercialization milestones of up to $150.0 million in the aggregate, as well as royalties on commercial net sales, depending on the advancement of the product candidate and eventual product.
The collaboration agreement was amended and restated in April 2011 in connection with an assignment of patents to a wholly-owned subsidiary. BMS may, at any time, terminate the collaboration agreement upon certain prior notice to us on a product-by-product and country-by-country basis. In addition, either party may terminate the agreement for the other party’s uncured material breach. In the event of termination by BMS at will or by us for BMS’s uncured material breach, the license granted to BMS would terminate, the right to such product would revert to us and we would receive a royalty-bearing license for late-stage reverted compounds and a royalty-free license for early-stage reverted compounds from BMS to develop and commercialize such product in the related country. In the event of termination by BMS for our uncured material breach, BMS would retain the right to such product, subject to continued payment of milestones and royalties.
Manufacturing and Product Supply
We do not own or operate manufacturing facilities,or distribution facilities or resources for chemistry, manufacturing and control (CMC) development activities, preclinical, clinical or commercial production and distribution offor our current products. Instead, we have multiple contractual agreements in place withrely on various third-party contract manufacturing organizations who,to conduct these operations on our behalf, manufacture clinicalbehalf. As our operations continue to grow in these areas, we continue to expand our supply chain through secondary third-party contract manufacturers, distributors and suppliers. Specifically, we entered into agreements with secondary contract manufacturing organizations to produce additional commercial supplies of CABOMETYX tablets and COMETRIQ. Ascabozantinib drug substance, which bolsters our operationscommercial supply chain and serves to mitigate the risk of supply chain interruptions or other failures. For our portfolio of small molecules and biotherapeutics, we continue to expand due to our development and commercial progress, we expect to enter into new agreements with additional third-party contract manufacturers and suppliers as needed. This will continue for the foreseeable future for all of our product candidates and all of our current and future commercial products. We have selectednetwork through well-established and reputable global third-party contract manufacturers for our drug substanceCMC development and drug product manufacturing that have good
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regulatory standing, largesuitable manufacturing capacities and multiple manufacturing sites within their business footprint.capabilities. These third parties must comply with applicable regulatory requirements, including the FDA’s Current Good Manufacturing Practices,Practice (GMP), the EC’s Guidelines on Good Distribution Practice (GDP), as well as other stringent regulatory requirements enforced by the FDA or foreign regulatory agencies, as applicable, and are subject to routine inspections by such regulatory agencies.
Through In addition, through our third-party contract manufacturers and data service providers, we have implemented product serialization designedcontinue to provide serialized commercial products as required to comply with the Drug Supply Chain Security Act (DSCSA), pursuant to which all prescription pharmaceutical products manufactured and distributed in the U.S. were required to be serialized as of November 27, 2018..
We monitor and evaluate the performance of our third-party contract manufacturers on an ongoing basis to ensurefor compliance with these requirements and to affirm their continuing capabilities to meet both our commercial and clinical

needs. We also have contracted with a third-party logistics provider, with multiple distribution locations, to provide shipping and warehousing services for our commercial supply of both CABOMETYX and COMETRIQ in the U.S. We employ highly skilled personnel with both technical and manufacturing experience to diligently manage the activities at our third-party contract manufacturers and other supply chain partners, and our quality department audits them on a periodic basis.
We source raw materials that are used to manufacture our drug substance from multiple third-party suppliers in Asia, Europe and Europe.North America. We stock sufficient quantities of these materials and provide them to our third-party drug substance contract manufacturers to ensureso they can manufacture adequate drug substance quantities per our requirements, for both clinical and commercial purposes. We then store drug substance at third-party facilities and provide appropriate amounts to our third-party drug product contract manufacturers, who then manufacture, package and label our specified quantities of finished goods for COMETRIQ and CABOMETYX, respectively. In addition, we rely on our third-party contract manufacturers to source materials such as excipients, components and reagents, which are required to manufacture our drug substance and finished drug product.
WithinIn addition to having expanded our supply chain to include secondary contract manufacturing organizations, we have established and continue to maintain sufficient safety stock amountsinventories for both our drug substance and drug products, and we store these quantities in multiple locations. The quantities that we store are based on our business needs and take into account scenarios for market demand, production lead times, potential supply interruptions and shelf life for our drug substance and drug products. In parallel, for business continuity reasons,While our response to the COVID-19 pandemic has included more frequent engagement with our vendors to maintain the consistency and effectiveness of our third-party contract manufacturers and other supply chain partners, we expecthave not experienced significant production delays or seen significant impairment to establish additional suppliers for our drug substancesupply chain as a result of the COVID-19 pandemic. For a more detailed discussion of the impact of the COVID-19 pandemic and drug product manufacturers soon.our risk mitigation efforts, see “Management’s Discussion and Analysis of Financial Condition and Results of Operations—COVID-19 Update” in Part II, Item 7 of this Annual Report on Form 10-K. We believe that our current manufacturing network has the appropriate capacity to produce sufficient commercial quantities of CABOMETYX to support the currently approved advanced RCC, HCC and HCCDTC indications, as well as potential additional indications if trials evaluating CABOMETYX in those indications prove to be successful and gain regulatory approval in the future. Our manufacturing footprint also enables us to fulfill our supply obligations for CABOMETYX and COMETRIQ to our collaboration partners Ipsen and Takeda, for global development and commercial purposes.
Marketing Sales and DistributionSales
We have a fully integrated commercial team consisting of sales, marketing, market access, and commercial operations functions. Our sales team promotes CABOMETYX and COMETRIQ in the U.S. In addition, although we currently do not co-promote COTELLIC alongside Genentech, we have the right to do so and will do so if we, in consultation with Genentech, deem it useful and appropriate to realize COTELLIC’s commercial objectives. We use customary pharmaceutical company practices to market our products in the U.S. and concentrate our efforts on oncologists, oncology nurses, pharmacists and pharmacists. other healthcare professionals. In addition to using customary in-person pharmaceutical company practices, we also utilize digital marketing technologies to expand our engagement opportunities with customers. 
Our commercial products, CABOMETYX and COMETRIQ, are sold initially through wholesale distribution and specialty pharmacy channels and then, if applicable, resold to hospitals and other organizations that provide CABOMETYX and COMETRIQ to end-user patients. To facilitate our commercial activities in the U.S., we also employ various third-party vendors,third parties, such as advertising agencies, market research firms and vendors providing other sales-support related services as needed.needed, including digital marketing and other non-personal promotion. We believe that our commercial team and distribution practices are sufficient to ensurefacilitate our marketing efforts reachin reaching our target audience and deliverour delivery of our products to patients in a timely and compliant fashion.
In addition, we rely on Ipsen and Takeda for ongoing and further commercialization and distribution of CABOMETYX in territories outside of the U.S., as well as for access and distribution activities for the approved products under named patient use programs or similar programs with the effect of introducing earlier patient access to CABOMETYX,
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and we also rely on Ipsen for these same activities with respect to the commercialization and distribution of COMETRIQ outside of the U.S. For COTELLIC, we rely on Genentech, as our collaboration partner, for all current and future commercialization and marketing activities, with the exception of the limited co-promotion activities highlighted above.
To help ensure that all eligible patients in the U.S. have appropriate access to CABOMETYX and COMETRIQ, we have established a comprehensive reimbursement and patient support program called Exelixis Access Services (EASE). Through EASE, we provide co-pay assistance to qualified, commercially insured patients to help minimize out-of-pocket costs and provide free drug to uninsured or under-insured patients who meet certain clinical and financial criteria. In addition, EASE provides comprehensive reimbursement support services, such as prior authorization support, benefits investigation and, if needed, appeals support. Beyond financial assistance, patients who participate in EASE also receive treatment coordination through a dedicated case manager, as well as clinical outreach and support from a network of oncology nurses or other healthcare professionals who help many of these patients better understand how to take their medication and mitigate side effects.
Seasonal Operations and Backlog
Sales of our marketed products do not reflect any significant degree of seasonality.
The markets in which we operate are characterized by short lead times and the absence of significant backlogs. We do not believe that backlog information is material to our business as a whole.

Environment,Environmental, Health and Safety
In support of the development and expansion of our product pipeline, we have resumed discovery activities. Our research and development processes involve the controlled use of certain hazardous materials and chemicals. We are subject toIn the U.S., at the federal, state and local levels, and in other foreign countries, we are subject to environmental, health and workplace safety laws and regulations governing the use, manufacture, storage, handling and disposal of hazardous materials. While we have incurred, and may continue to incur, expenditures to ensure we are inmaintain compliance with these laws and regulations, we do not expect the cost of complying with these laws and regulations to be material.
Laboratory Safety Program
Due to the focus of our business in discovering and developing drug products, many of our employees work in our on-site laboratory facilities. All new laboratory staff are trained on chemical hygiene, the use of personal protective equipment, and certain other relevant laboratory safety topics, such as working with blood-borne pathogens, and current staff are retrained regularly. We also extend these trainings to facilities staff and others who support our work in the labs. In an effort to maintain a safe environment for all staff, we regularly perform thorough safety inspections of our laboratories, and continuously update our procedures based on the observations made during these inspections. Additionally, we conduct periodic industrial hygiene monitoring to ensure lab staff working with certain known hazardous chemicals do not exceed regulated exposure limits, and we regularly test and certify fume hoods, biosafety cabinets and other individual pieces of equipment on which employees rely to maintain a safe work environment.
Workplace Safety Measures in Response to COVID-19
We will continue to monitor the latest guidance issued by health authorities and have instituted several policies and procedures to protect against the spread of COVID-19 among our workforce. Since the third quarter of 2021, we have implemented a vaccination mandate and maintain several enhanced safety and social distancing protocols at our headquarters. In addition, we also offer on-site, rapid PCR COVID-19 testing, and utilize a mobile device app and web interface, which enable our team members to perform daily symptom tracking and schedule on-site tests at the Exelixis headquarters, and which also provide contact tracing and educational resources for any team member who may have tested positive.
Other policies and procedures currently include frequent disinfection of common areas by our operations staff and investments in re-engineering workspace safety, such as providing ample supplies of hand sanitizer, sanitizing wipes and facemasks for use by our staff, and adjusting our ventilation systems in an effort to minimize risks of airborne transmission. Although the COVID-19 pandemic has presented several new challenges for us, to date, we have only experienced a modest impact on our productivity without significant interruptions in our general business operations. For a more detailed discussion of the impact of the COVID-19 pandemic and our risk mitigation efforts, see “Management’s Discussion and Analysis of Financial Condition and Results of Operations—COVID-19 Update” in Part II, Item 7 of this Annual Report on Form 10-K.

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Government Regulation
Clinical Development
The FDA and comparable regulatory agencies in state and local jurisdictions and in foreign countries impose substantial requirements upon the clinical development, manufacture and marketing of pharmaceutical products. These agencies and other federal, state and local entities regulate, among other things, research and development activities and the testing, marketing approval, manufacture, quality control, safety, effectiveness, labeling, storage, distribution, post-marketing safety reporting, export, import, record keeping, advertising and promotion of our products.
The process required by the FDA before product candidates may be marketed in the U.S. generally involves the following:
nonclinical laboratory and animal tests, some of which must be conducted in accordance with Good Laboratory Practices;Practices (GLP);
submission of an IND, which contains results of nonclinical studies (e.g., laboratory evaluations of the chemistry, formulation, stability and toxicity of the product candidate), together with manufacturing information, analytical data, any available clinical data or literature and a proposed clinical protocol, and must become effective before human clinical trials may begin;
approval by an independent institutional review board or ethics committee at each clinical trial site before each trial may be initiated;
adequate and well-controlled human clinical trials conducted in accordance with the protocol, IND and Good Clinical Practice (GCP) to establish the safety and efficacy of the investigational drug candidate for its proposed intended use;
for drug products, submission of ana New Drug Application (NDA) to the FDA for commercial marketing, or generally of a supplemental New Drug Application (sNDA),an sNDA, for approval of a new indication if the product is already approved for another indication;
for biologicalbiotherapeutic products, submission of a Biologics License Application (BLA) to the FDA for commercial marketing, or generally a supplemental Biologics License Application (sBLA) for approval of a new indication if the product is already approved for another indication;
pre-approval inspection of manufacturing facilities and selected clinical investigators, clinical trial sites and/or Exelixis as the clinical trial sponsor for their compliance with Good Manufacturing Practices (GMP)GMP and Good Clinical Practices (GCP);GCP, respectively;
payment of user fees for FDA review of an NDA or BLA unless a fee waiver applies;
agreement with the FDA on the final labeling for the product;
if the FDA convenes an advisory committee, satisfactory completion of the advisory committee review; and
FDA approval of the NDA or sNDA, or BLA or sBLA.
The testing and approval process requires substantial time, effort and financial resources. Prior to commencing the first human clinical trial with a product candidate, we must submit an IND to the FDA. The IND automatically becomes effective 30 days after receipt by the FDA, unless the FDA, within the 30-day time period, raises concerns or questions about the conduct of the clinical trial. In such a case, the IND sponsor and the FDA must resolve any outstanding concerns before the clinical trial can begin. Submission of an IND may not result in FDA authorization to commence a clinical trial. A separate submission to the existing IND must be made for each successive clinical trial conducted during product development. Further, an independent institutional review board for each medical center proposing to conduct the clinical trial must review and approve the plan for any clinical trial and provide its informed consent form before the trial commences at that center. Regulatory authorities or an institutional review board or the sponsor may suspend a clinical trial at any time on various grounds, including a finding that the subjects or patients are being exposed to an unacceptable health risk.
For purposes of NDA approval, human clinical trials are typically conducted in three sequential phases that may overlap.overlap or be combined:
Phase 1 - Studies,studies, which involve the initial introduction of a new drug product candidate into humans, are initially conducted in a limited number of subjects to test the product candidate for safety, tolerability, absorption, metabolism, distribution and excretion in healthy humans or patients. In rare cases, a Phase 1 study that is designed to assess effectiveness may serve as the basis for FDA marketing approval of a drug or for a label expansion. For instance, at FDA’s discretion, a product may receive approval based on a Phase 1b study if effectiveness results from the study are extremely compelling, approval of the drug would address a significant unmet patient need, and the drug is being approved through the accelerated approval pathway. As discussed below, Accelerated Approval generally requires a post-approval study to confirm clinical benefit.
Phase 2 - Studiesstudies are conducted with groups of patients afflicted with a specified disease in order to provide enough data to evaluate the preliminary efficacy, optimal dosage, and common short-term side effect and risks associated with the drug. Multiple phase 2 clinical trials may be conducted by the sponsor to obtain information prior to beginning larger and more expensive phase 3 clinical trials. Phase 2 studies are typically well controlled, closely monitored, and conducted in a relatively small number of patients, usually involving no more than several hundred subjects. In some cases, a sponsor may decide to run what is referred to as a “phase 2b”

evaluation, which is a second, confirmatory phase 2 trial that could, if positive, serve as a pivotal trial in the approval of a product candidate.
Phase 3 - When earlier phase evaluations provide preliminary evidence suggesting that a dosage range of the product is effective and has an acceptable safety profile, phase 3 trialsstudies are performedconducted to gather the additional information about effectiveness and safety that is needed toacross a higher number of patients and evaluate the overall benefit-risk relationship of the drug product candidate following earlier phase evaluations, which will have provided preliminary evidence suggesting an effective dosage range
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and acceptable safety profile for the product candidate. Phase 3 trials are also intended to provide an adequate basis for physician labeling. Phase 3 trials are undertaken in large patient populations to further evaluate dosage, to provide statistically significant evidencelabeling of clinical efficacy and to further test for safety in an expanded patient population at multiple clinical trial sites.the product if it is approved.
The FDA may require, or companies may pursue, additional clinical trials after a product is approved. These so-called phase 4post-marketing or “phase 4” studies may be madedeemed a condition to be satisfied after a drug receives approval. Failure to satisfy such post-marketing commitments can result in FDA enforcement action, up to and including withdrawal of NDA approval. The results of phase 4 studies can confirm the effectiveness
FDA Review and Approval
For approval of a product candidate and can provide important safety informationnew drug or changes to augment the FDA’s adverselabeling of an approved drug, reaction reporting system. Theincluding new indications, the results of product development, preclinical studies and clinical trials are submitted to the FDA as part of an NDA, or as part of an sNDA. The submission of an NDA requires payment of a substantial user fee to the FDA. The FDA may convene an advisory committee to provide clinical insight on NDA review questions. Althoughquestions, although the FDA is not required to follow the recommendations of an advisory committee, the agency usually does so.committee. The FDA may initially issue a Refuse to File letter for an incomplete NDA or sNDA, or it may deny approval of an NDA or sNDA by way of a Complete Response letter if the applicable regulatory criteria are not satisfied, or it mayalternatively require additional clinical and/or nonclinical data and/or an additional phase 3 pivotal clinical trial. Even if such data are submitted, the FDA may ultimately decide that the NDA or sNDA does not satisfy the criteria for approval. An NDA may be approved with significant restrictions on its labeling, marketing and distribution under a Risk Evaluation and Mitigation Strategy. Once issued, the FDA may withdraw product approval if ongoing regulatory standards are not met or if safety problems occur after the product reaches the market. In addition, the FDA may require testing and surveillance programs to monitor the effect of approved products that have been commercialized, and the FDA has the power to prevent or limit further marketing of a product based on the results of these post-marketing programs.
Satisfaction of FDA development and approval requirements or similar requirements of state, local and foreign regulatory agencies typically takes several years, and the actual time required may vary substantially based upon the type, complexity and novelty of the product or disease. Government regulation may delay or prevent marketing of product candidates for new diseases for a considerable period of time and impose costly procedures upon our activities. The FDA or any other regulatory agency may not grant approvals for new indications for our product candidates on a timely basis, if at all. Success in early stage clinical trials does not ensure success in later stage clinical trials. Targets and pathways identified in vitro may be determined to be less relevant in clinical studies and results in animal model studies may not be predictive of human clinical results. Data obtained from clinical activities are not always conclusive and may be susceptible to varying interpretations, which could delay, limit or prevent regulatory approval. Even if a product candidate receives regulatory approval, the approval may be significantly limited to specific disease states, patient populations and dosages. Further, even after regulatory approval is obtained, later discovery of previously unknown problems with a product may result in restrictions on the product or even complete withdrawal of the product from the market, including withdrawal of the NDA approval.
Any products manufactured or distributed by us pursuant to FDA approvals are subject to continuing regulation by the FDA, including obtaining prior FDA approval of certain changes to the approved NDA, record-keeping requirements, and reporting of adverse experiences with, and interruptions in the manufacture of, the drug. Drug manufacturers and their subcontractors are required to register their establishments with the FDA and certain state agencies,agencies. Thus, we and our third-party contract manufacturing organizations are subject to periodic unannounced inspections by the FDA and certain state agencies for compliance with GMP, which impose certain manufacturing requirements including(including procedural and documentation requirements,requirements) upon us and our third-party manufacturers.
The FDA closely regulates the marketing and promotion of drugs, including restricting the promotion of uses for which a drug is not approved by the agency. Not only must a company have appropriate substantiation to support claims made about a drug, under the FDA’s current interpretation of the relevant laws, a company can make only those claims relating to safety and efficacy that are for indications for which the FDA has approved the drug and that are otherwise consistent with the FDA-approved label for the drug. Failure to comply with these requirements can result in adverse publicity, warning or untitled letters, corrective advertising and potential civil and criminal penalties. Physicians may, in their independent medical judgment, prescribe legally available drugs for uses that are not described in the product’s labeling and that differ from those tested by us and approved by the FDA. Such off-label uses are common across medical specialties. Physicians may believe that such off-label uses are the best treatment for many patients in varied circumstances. The FDA generally does not regulate the behavior of physicians in their choice of treatments. The FDA does, however, restrict manufacturers’ communications on the subject of off-label uses. Additionally, a significant number of pharmaceutical companies have been the target of inquiries and investigations by various U.S. federal and state regulatory, investigative,

prosecutorial and administrative entities in connection with the promotion of products for off-label uses and other sales practices. These investigations have alleged violations of various U.S. federal and state laws and regulations, including claims asserting antitrust violations, violations of the Federal Food, Drug, and Cosmetic Act (FDCA), false claims laws, the Prescription Drug Marketing Act, anti-kickback laws and other alleged violations in connection with the promotion of products for unapproved uses, pricing and Medicare and/or Medicaid reimbursement.contract manufacturing organizations.
In the U.S., the Orphan Drug Act of 1983, as amended, is intended to incentivizeprovides incentives for the development of drugs and biologicalbiotherapeutic products for rare diseases or conditions that affect fewer than 200,000 people in the U.S. (or that affects more than 200,000 persons in the U.S. and for which there is no reasonable expectation that the cost of developing and making available the drug in the U.S. for such disease or condition will be recovered from sales of the drug in the U.S.). If aCertain of the incentives turn on the drug isfirst being developed for a rare disease or condition, todesignated as an orphan drug. To be eligible for designation as an orphan drug (Orphan Drug Designation), the drug must have the potential to treat such rare disease or condition as described above. In addition, the FDA must not have previously approved a drug considered the “same drug,” as defined in the FDA’s orphan drug regulations, for the same orphan-designated indication. If the FDA has previously approved another same drug for the same indication to obtain orphan drug designation,or the sponsor of the subsequent drug would be required tomust provide a plausible hypothesis of clinical superiority over the previously approved drug to obtain an orphan designation.same drug. Upon FDA receipt of Orphan Drug Designation, the sponsor is eligible for tax credits of up to 50%25% for qualified clinical trial expenses the ability to apply for grant funding, and waiver of the Prescription Drug User Fee Act (PDUFA) application fee. Following the passage of the Tax Cuts and Jobs Act of 2017, for clinical trial expenses incurred in tax years 2018 and going forward, the tax credit is reduced to 25%. In addition, upon marketing approval, an orphan-designated drug could be eligible for seven years of market exclusivity if no drug considered the same drug was previously approved for the same orphan condition (or if the subsequent drug is demonstrated to be clinically superior to any such previously approved orphan-designated indication.same drug). Such orphan drug exclusivity, if awarded, would only block the approval of any drug considered the same drug for the same orphan indication. Moreover, a subsequent same drug could break a previouslyan approved drug’s orphan exclusivity through a demonstration of clinical superiority over the previously approved drug.
Expedited FDA Approval Pathways
The FDA has various programs including Fast Track, priority review and accelerated approval, whichthat are intended to expedite or simplify the process for developing and reviewing promising drugs, or to provide for the approval of a drug on the basis of a surrogate endpoint. Generally, drugs that are eligible for these programs are those for serious or life-threatening conditions, those with the potential to address unmet medical needs and those that offer meaningful benefits over existing treatments. For example, Examples of such programs included Fast Track designation, breakthrough therapy designation, priority review and accelerated approval, and the eligibility criteria of and benefits for each program vary:
Fast Track is a process designed to facilitate the development and expedite the review of drugs intended to treat serious or life-threatening diseases or conditions that demonstrate the potential to fill unmet medical needs. needs, by providing, among other things, eligibility for accelerated approval if relevant criteria are met, and rolling review,
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which allows submission of individually completed sections of an NDA or for FDA review before the entire submission is completed.
Breakthrough therapy designation is a process designed to expedite the development and review of drugs that are intended, alone or in combination with one or more other drugs, to treat a serious or life-threatening disease or condition, and preliminary clinical evidence indicates that the drug may demonstrate substantial improvement over existing therapies on one or more clinically significant endpoints. Drugs designated as breakthrough therapies are also eligible for accelerated approval. The FDA will seek to ensure the sponsor of a breakthrough therapy product candidate receives intensive guidance on an efficient drug development program, intensive involvement of senior managers and experienced staff on a proactive, collaborative and cross-disciplinary review, and rolling review.
Priority review is designed to shorten the review period for drugs that treat serious conditions and that, if approved, would offer significant advances in safety or effectiveness or would provide a treatment where no adequate therapy exists. Under priority review, the FDA aims to take action on the application within six months as compared to a standard review time of 10 months. Certain other types of drug applications areSponsors may also eligible for priority review. Although Fast Track andobtain a priority review do not affect the standardsvoucher upon approval of an NDA for approval, the FDA will attemptcertain qualifying diseases and conditions that can be applied to facilitate early and frequent meetings with a sponsor of a Fast Track designated drug and expedite review of the application for a drug designated for priority review. subsequent NDA submission
Accelerated approval provides for an earlier approval for a new drug that is intended to treat a serious or life-threatening disease or condition and that fillsprovides a meaningful advantage over available therapies and demonstrates an unmet medical need basedeffect on a surrogate endpoint, or certainan intermediate clinical endpoints,endpoint, which is considered reasonably likely to predict clinical benefit. As a condition of approval, the FDA may requirerequires that a sponsor of a product candidate receiving accelerated approval perform post-marketing clinical trials or provide data on established clinical endpoints from the same trial to confirm the clinically meaningful outcomeclinical benefit as predicted by the surrogate marker trial. In additionThe failure to conduct such trials, or confirm the Fast Track,clinically meaningful outcome in such trials, may result in withdrawal of the approval of the drug or the indication approved under accelerated approval and priority review programs, approval.
Specifically, with respect to oncology products, the FDA also designates Breakthrough Therapy statusmay review applications under the Real-Time Oncology Review (RTOR) pilot program established by the FDA’s Oncology Center of Excellence. The RTOR pilot program, which allows an applicant to drugspre-submit components of the application to allow the FDA to review clinical data before the complete filing is submitted, aims to explore a more efficient review process to ensure that safe and effective treatments are intended, alone or in combination with one or more other drugs,available to treat a serious or life-threatening disease or condition,patients as early as possible, while maintaining and preliminary clinical evidence indicates thatimproving review quality. Drugs considered for review under the drug mayRTOR pilot program must be likely to demonstrate substantial improvementimprovements over existing therapies on one or more clinically significant endpoints, such as substantial treatment effects observed early in clinical development. Drugs designated as breakthrough therapies are also eligible for accelerated approval. The FDA will seek to ensure the sponsor of aavailable therapy, which may include drugs previously granted breakthrough therapy product candidate receives: intensive guidance on an efficient drug development program; intensive involvement of senior managersdesignation for the same or other indications, and experienced staff on a proactive, collaborativemust have straight-forward study designs and cross-disciplinary review;endpoints that can be easily interpreted.
Abbreviated FDA Approval Pathways and rolling review.Generic Products
The Drug Price Competition and Patent Term Restoration Act of 1984 (The Hatch-Waxman Act)
The Hatch-Waxman Act established two abbreviated approval pathways for drug products in which potential competitors may rely upon the FDA’s prior approval of the same or similar drug product.
Abbreviated New Drug Application (ANDA). An ANDA may be approved by the FDA if the applicant demonstrates that the proposed generic product is the same as the approved drug, which is referred to as the Reference Listed Drug (RLD). Generally, an ANDA must contain data and information showing that the proposed generic product and RLD (1) have the same active ingredient, in the same strength and dosage form, to be delivered via the same route of administration, (2) are intended for the same uses, and (3) are bioequivalent. This is instead of independently demonstrating the proposed product’s safety and effectiveness which are inferred from the fact that the product is the same as the RLD, which the FDA

previously found to be safe and effective. Furthermore, conductingthrough clinical development. Conducting bioequivalence testing is generally less time consuming and costly than conducting a full set of clinical trials in humans. In this regard, the FDA has published draft guidance containing product-specific bioequivalence recommendations for drug products containing cabozantinib, the active pharmaceutical ingredient in CABOMETYX and COMETRIQ, as it does for many FDA-approved therapeuticdrug products.
505(b)(2) NDAs. A 505(b)(2) applicationNDA is onean application for which one or more of the investigations relied upon by the applicant for approval were not conducted by or for the applicant and for which the applicant has not obtained a right of reference or use from the person by or for whom the investigations were conducted. Under Section 505(b)(2) NDA of the FDCA,Federal Food, Drug, and Cosmetic Act (FDCA), an applicant may rely, in part, on the FDA’s previous approval of a similar product, or published literature, in support of its application. If the 505(b)(2) applicant establishes that reliance on the FDA’s prior findings of safety and efficacy for an approved product is
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scientifically appropriate, it may eliminate the need to conduct certain preclinical or clinical studies. The FDA may require additional studies or measurements, including comparability studies.
Unlike a full NDA for which the sponsor has conducted or obtained a right of reference to all the data essential to approval, the filing of both an ANDA application andor a 505(b)(2) applicationNDA may be delayed due to patent or exclusivity protections covering an approved product. The Hatch-Waxman Act provides (a) up to five years of exclusivity for the first approval of a new chemical entity (NCE) exclusivity and (b) three years of exclusivity for approval of an NDA or supplemental applicationsNDA for a product that is not an NCE but rather where the application contains new clinical studies conducted or sponsored by the sponsor and considered essential to the approval of the NDA or sNDA (three-year “changes” exclusivity). NCE exclusivity runs from the time of approval of the NDA and bars FDA from accepting for review of any ANDA or 505(b)(2) applicationNDA for a drug containing the same active moiety for five years (or for four years if the application contains a paragraphParagraph IV certification that a reference product patent is invalid or not infringed by the ANDA/505(b)(2) NDA product). The three-year “changes” exclusivity generally bars the FDA from approving any ANDA or 505(b)(2) NDA application that relies on the information supporting the approval of the drug or the change to the drug for which the information was submitted and the exclusivity granted.
Both Congress and the FDA are considering, and have enacted, various legislative and regulatory proposals focused on drug competition, including legislation focused on drug patenting and provision of drug to generic applicants for testing. For example, the Ensuring Innovation Act, enacted in April 2021, amended the FDA’s statutory authority for granting NCE exclusivity to reflect the agency’s existing regulations and longstanding interpretation that award NCE exclusivity based on a drug’s active moiety, as opposed to its active ingredient, which is intended to limit the applicability of NCE exclusivity, thereby potentially facilitating generic competition. The FDA has also released, and continues to implement, a Drug Competition Action Plan, which proposes actions to broaden access to generic drugs and lower consumers’ healthcare costs by, among other things, improving the efficiency of the generic drug approval process and supporting the development of complex generic drugs. In addition, the Further Consolidated Appropriations Act, 2020, which incorporated the framework from the Creating and Restoring Equal Access To Equivalent Samples (CREATES) legislation, purports to promote competition in the market for drugs and biotherapeutic products by facilitating the timely entry of lower-cost generic and biosimilar versions of those drugs and biotherapeutic products, including by allowing ANDA, 505(b)(2) NDA or biosimilar developers to obtain access to branded drug and biotherapeutic product samples.
Orange Book Listing. An NDA sponsor must identify to the FDA patents that claim the drug substance or drug product or approved method of using the drug. When the drug is approved, those patents are among the information about the product that is listed in the FDA publication, Approved Drug Products with Therapeutic Equivalence Evaluations, which is referred to as the Orange Book. Any applicant who files an ANDA or a 505(b)(2) NDA must certify, for each patent listed in the Orange Book for the RLD that (1) no patent information on the drug product that is the subject of the application has been submitted to the FDA, (2) such patent has expired, (3) the listed patent will expire on a particular date and approval is sought after patent expiration, or (4) such patent is invalid or will not be infringed upon by the manufacture, use or sale of the drug product for which the application is submitted. An ANDA or 505(b)(2) NDA applicant may also submit a statement that it intends to carve-out from the labeling of its product an RLD’s use that is protected by exclusivity or a method of use patent. The fourth certification described above is known as a Paragraph IV certification. A notice of the Paragraph IV certification must be provided to each owner of the patent that is the subject of the certification and to the reference NDA holder. The reference NDA holder and patent owners may initiate a patent infringement lawsuit in response to the Paragraph IV notice. Filing such a lawsuit within 45 days of the receipt of the Paragraph IV certification notice prevents the FDA from approving the ANDA or 505(b)(2) NDA until the earlier of 30 months, expiration of the patent, settlement of the lawsuit, or a decision in the infringement case that is favorable to the ANDA or 505(b)(2) NDA applicant. The ANDA or 505(b)(2) applicationNDA also will not receive final approval until any applicable non-patent exclusivity listed in the Orange Book for the RLD has expired. We intend to defend vigorously any patents for our approved products.
RegulationRegulatory Approval Outside of the United States
In addition to regulations in the U.S., we are subject to regulations of other countries governing clinical trials and the manufacturing, commercial sales and distribution of our products outside of the U.S. Whether or not we obtain FDA approval for a product, we must obtain approval by the comparable regulatory authorities of countries outside of the U.S. before we can commence clinical trials in such countries and approval of the regulators of such countries or economic areas, such as the EU, before we may market products in those countries or areas. The approval process and requirements governing the conduct of clinical trials, product licensing, pricing and reimbursement vary greatly from place to place, and the time may be longer or shorter than that required for FDA approval.
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The way clinical trials are conducted in the EU will undergohas undergone a major change whenwith the application of Regulation (EU) 536/2014, governing clinical trials in the EU, repealing the existing Directive 2001/20/EC comes into application in 2019.EC. This new regulation harmonizes the assessment and supervision processes for clinical trials throughout the EU, via an EU portal and database. Thedatabase, which the EMA will set up and maintain the portal and database, in collaboration with the Member States and the EC. Following the EC’s confirmation of full functionality of the Clinical Trials Information System (CTIS) through an independent audit, which was published in the Official Journal of the European Union in August 2021, Regulation (EU) 536/2014 became applicable concurrent with the CTIS “go-live” date on January 31, 2022.
Under EU regulatory systems, a company may submit MAAsa marketing authorization application (MAA) either under centralized or decentralized procedure. Under the centralized procedure, MAAs are submitted to the EMA for scientific review by the Committee for Medicinal

Products for Human Use (CHMP) so that an opinion is issued on product approvability. The opinion is considered by the EC which is responsible for granting the centralized marketing authorization in the form of a binding EC decision. If the application is approved, the EC grants a single marketing authorization that is valid for all EU member statesMember States as well as Iceland, Liechtenstein and Norway, collectively the European Economic Area (EEA).Area. The decentralized and mutual recognition procedures, as well as national authorization procedure are available for products for which the centralized procedure is not compulsory. The mutual recognition procedure provides for the EU member statesMember States selected by the applicant to mutually recognize a national marketing authorization that has already been granted by the competent authority of another member state,Member State, referred to as the Reference Member State (RMS). The decentralized procedure is used when the product in question has yet to be granted a marketing authorization in any member state.Member State. Under this procedure the applicant can select the member stateMember State that will act as the RMS. In both the mutual recognition and decentralized procedures, the RMS reviews the application and submits its assessment of the application to the member statesMember States where marketing authorizations are being sought, referred to as Concerned Member States. Within 90 days of receiving the application and assessment report, each Concerned Member State must decide whether to recognize the RMS assessment.assessment or reject it on the basis of potential serious risk to public health. If a member state does not agree with the assessment, and the disputed points cannot be resolved, the matter is eventually referred to the Coordination Group on Mutual Recognition and Decentralised proceduresProcedures in the first instance to reach an agreement and failing to reach such an agreement, a referral to the EMA and the CHMP for arbitration that will result in an opinion to form the basis of a decision to be issued by the EC binding on all member states.Member States. If the application is successful during the decentralized or mutual recognition procedure, national marketing authorizations will be granted by the competent authorities in each of the member statesMember States chosen by the applicant.
Conditional marketing authorizations may be granted in the centralized procedure for a limited number of medicinal products for human use referenced in EU law applicable to conditional marketing authorizations where the clinical dataset is not comprehensive, if (1) the risk-benefit balance of the product is positive, (2) it is likely that the applicant will be in a position to provide the required comprehensive clinical trial data, (3) unmet medical needs will be fulfilled and (4) the benefit to public health of the immediate availability on the market of the medicinal product outweighs the risk inherent in the fact that additional data are still required. Specific obligations, such as the completion of ongoing or new studies and obligations relating to the collection of pharmacovigilance data, may be amongst the conditions stipulated in the marketing authorization.
As in the U.S., we may apply for designation of a product as an Orphanorphan drug for the treatment of a specific indication in the EU before the application for marketing authorization is made. In the EU, orphan designation is available for products in development which are either: (a) intended for the diagnosis, prevention or treatment of life-threatening or chronically debilitating conditions affecting not more than 5 in 10,000 persons in the EU,EU; or (b) intended for the diagnosis, prevention or treatment of a life-threatening, seriously debilitating or serious and chronic condition in the Community andaffecting a larger number of persons but when, without incentives, it is unlikely that sales of the drug in the EU would be sufficient to justify the necessary investment in developing the medicinal product. Additionally, the sponsor of an application for designation of a product as an orphan drug designationin the EU must establish that there exists no satisfactory authorized method of diagnosis, prevention, or treatment of the condition or even if such treatment exists, the product will be of significant benefit to those affected by that condition.
Orphan drugs in the EU enjoy economic and marketing benefits, including up to ten years of market exclusivity for the approved indication unless another applicant for a similar medicinal product can show that its product is safer, more effective or otherwise clinically superior to the orphan-designated product. The period of market exclusivity may be reduced to six years if at the end of the fifth year it is established that the criteria for orphan designation are no longer met, including where it is shown that the product is sufficiently profitable not to justify maintenance of market exclusivity.
Healthcare and Privacy Regulation
Federal and state healthcare laws, including fraud and abuse and health information privacy and security laws, also apply togovern our business. If we fail to comply with those laws, we could face substantial penalties and our business, results of operations, financial condition and prospects could be adversely affected. The laws that may affect our ability to operate
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include, but are not limited to: the federal Anti-Kickback Statute (AKS), which prohibits.prohibits, among other things, soliciting, receiving, offering or paying remuneration, directly or indirectly, to induce or in returnreward for, the purchase or recommendation of an item or service reimbursable under a federal healthcare program, such as the Medicare and Medicaid programs;Medicaid; the FDCA and its implementing regulations, which prohibit, among other things, the introduction or delivery for introduction into interstate commerce of any drug that is adulterated or misbranded; and federal civil and criminal false claims laws, including the civil False Claims Act, and civil monetary penalty laws, which prohibit, among other things, individuals or entities from knowingly presenting, or causing to be presented, claims for payment from Medicare, Medicaid, or other third-party payers that are false or fraudulent. Additionally, we are subject to state law equivalents of each of the above federal laws, which may be broader in scope and apply regardless of whether the payer is a federalgovernmental healthcare program, and many of which differ from each other in significant ways and may not have the same effect, further complicate compliance efforts.

Numerous federal and state laws, including state security breach notification laws, state health information privacy laws and federal and state consumer protection laws, govern the collection, use and disclosure of personal information. For example, in June 2018, California Governor Jerry Brown signed the California Consumer Privacy Act of 2018, as amended (CCPA), which takes effectwent into operation on January 1, 2020 and will broadly definedefines personal information, giveaffords California residents expanded privacy rights and protections and provideprovides for civil penalties for violations and a private right of action forrelated to certain data security breaches. There are similarThese protections will be expanded by the California Privacy Rights Act (CPRA), which was approved by California voters in November 2020 and will be operational in most key respects on January 1, 2023. Similar legislative proposals have passed or are being advanced in other states, as well as in Congress.and Congress is considering additional federal privacy legislation. In addition, most healthcare providersprofessionals and facilities who are expected tomay prescribe our products and from whom we may obtain patient health information, are subject to privacy and security requirements under the Health Insurance Portability and Accountability Act of 1996, as amended by the Health Information Technology and Clinical Health Act (HIPAA). Although we are not directly subjectconsidered to be a covered entity or business associate under HIPAA with respect to our clinical and commercial activities, we could be subject to criminal penalties if we obtain and/use or disclose individually identifiable health information from a HIPAA-covered entity, including healthcare providers, in a manner that is not authorized or permitted by HIPAA. The legislative and regulatory landscape for privacy and data protection continues to evolve, and there has been an increasing amount of focus on privacy and data protection issues with the potential to affect our business, including recently enacted laws in a majority ofall 50 states requiring security breach notification. Thesenotification in some circumstances. The CCPA, CPRA, HIPAA and these other laws could create liability for us or increase our cost of doing business. Other countries also have, or are developing, laws governing the collection, use and transmission of personal information. International laws, such as the EU General Data Protection Regulation 2016/679 (GDPR), could also apply to our operations. Failure to provide adequate privacy protections and Swiss Federal Act on Data Protection, regulate the processing of personal data within the EUmaintain compliance with applicable privacy laws could jeopardize business transactions across borders and between countriesresult in the EU and countries outside of the EU, including the U.S. On April 27, 2016, the EU legislature adopted the GDPR, which replaced the prior Directive 95/46/EC when it took effect on May 25, 2018, and it is directly applicable in all Member States. The GDPR applies to EU-based organizations engaged in the processing of personal data belonging to EU data subjects. The GDPR has an extra-territorial effect in the sense that it applies to a “controller” or “processor” who is not established in the EU and is engaged in processing of personal data of EU subjects. Furthermore, in October 2015, the Court of Justice of the EU declared the previous framework, the International Safe Harbor Privacy Principles (the Safe Harbor) invalid for data transfer between the U.S. and the EU. The Safe Harbor has now been replaced by the EU-U.S. Privacy Shield, a framework for transatlantic exchanges of personal data for commercial purposes between the EU and the U.S. in accordance with the principles of the GDPR.  Accordingly, there may be an immediate impact on companies located in the U.S. as they devote resources to comply with these new obligations.  The GDPR establishes a tiered approach to penalties for breach which enables the data protection authorities of the various Member States to impose fines for certain infringements, including the breach of requirements relating to international transfers or the basic principles for processing of personal data (such as conditions for obtaining consent from that individual whose data is being transferred). The severity of these fines may be up to the higher of 4% of annual worldwide revenue or €20 million.significant penalties.
In addition, the Patient Protection and Affordable Care Act of 2010, as amended by the Health Care and Education Reconciliation Act (the PPACA)(PPACA) created a federal requirement under the federal Open Payments program, that requires certain manufacturers to track and report to the Centers for Medicare and& Medicaid Services annually certain payments and other transfers of value provided to physicians (defined to include doctors, dentists, optometrists, podiatrists and chiropractors), other healthcare professionals (such as physician assistance and nurse practitioners) and teaching hospitals, made inas well as ownership interests held by such physicians and their immediate family during the previous calendar year. In addition, there are also an increasing number of state laws that require manufacturers to make reports to states on pricing and marketing information. These laws may affect our sales, marketing, and other promotional activities by imposing administrative and compliance burdens on us. In addition, given the lack of clarity with respect to these laws and their implementation, our reporting actions could be subject to the penalty provisions of the pertinent state and federal authorities.
Because our products are covered in the U.S. by the Medicaid programs, we have various obligations, including government price reporting and rebate requirements, which generally require us to pay substantial rebates or offer our products be offereddrugs at substantial rebates/discounts to Medicaid and certain purchasers (including “covered entities” purchasing under the 340B Drug Discount Program (the 340B Program)). We are also required to discount suchour products to authorized users of the Federal Supply Schedule of the General Services Administration, under which additional laws and requirements apply. These programs require submission of pricing data and calculation of discounts and rebates pursuant to complex statutory formulas and regulatory guidance, as well as the entry into government procurement contracts governed by the Federal Acquisition Regulations, and the guidance governing such calculations is not always clear. Compliance with such requirements can require significant investment in personnel, systems and resources, but failureresources. Failure to properly calculate prices, or to offer required discounts or rebates could subject us to substantial penalties.Subject to the application in the EU of the Transparency Directive 89/105/EEC, which aims to ensure the transparency of measures adopted to control pricing
Coverage and reimbursement, pricing and reimbursement in the EU/EEA is governed by national rules and policy and may vary from Member State to Member State.
Reimbursement
Sales of our approved products and any future products of ours will depend, in part, on the extent to which their costs will be covered by third-party payers, such as government health programs, commercial insurance and managed healthcare organizations. PatientsEach third-party payer may be less likely to use ourhave its own policy regarding what products if coverage is not providedit will cover, the conditions under which it will cover such products, and reimbursement is inadequate to cover a significant portion of the cost of our products. In addition, although to date qualified patients who

would not otherwise be able to afford our products have been able to receive financial support from us in some cases, and from independent patient support foundations in other cases, these programs have recently been subject to significant government scrutiny, and in the future these patients may no longer be able to use ourhow much it will pay for such products. Third-party payers may limit coverage to specific drug products on an approved list, also known as a formulary, which might not include all of the FDA-approved drugs for a particular indication. Moreover, a third-party payer’s decision to provide coverage for a drug product
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does not imply that an adequateguarantee what reimbursement rate, if any, will be approved. Additionally, a third-party payer’s decisionPatients may be less likely to use our products if coverage is not provided and reimbursement may not cover a particular drug product does not ensure that other payers will also provide coverage forsignificant portion of the drug product, or will provide coverage at an adequate reimbursement rate.cost of our products.
In the U.S. and other potentially significant markets for our products, government authorities and third-party payers are increasingly attempting to limit or regulate the price of medical products and services, particularly for new and innovativeproducts and therapies, which may result in lower average selling prices. In some cases, for example, third-party payers try to encourage the use of less expensive generic products through their prescription benefits coverage and reimbursement and co-pay policies. Further, the increased emphasis on managed healthcare in the U.S. and on country-specific and national pricing and reimbursement controls in the EU will put additional pressure on product pricing, reimbursement and usage, which may adversely affect our future product sales and results of operations. These pressures can arise from rules and practices of managed care groups, judicial decisions and governmental laws and regulations related to Medicare, Medicaid and healthcare reform, pharmaceutical reimbursement policies and pricing in general. Adoption of price controls and cost-containment measures, and adoption of more restrictive policies in jurisdictions with existing coverage and/or reimbursement controls and measures, could have a material adverse impact on our net product revenues and results of operations.
Healthcare Reform
The U.S. and some foreign jurisdictionscountries are considering proposals or have enacted legislative and regulatory changes to the healthcare system that could affect our ability to sell our products profitably. Among policy makers and payers in the U.S. and elsewhere, there is significant interest in promoting changes in healthcare systems with the stated goals of containing healthcare costs, improving quality and/or expanding access.
There has been particular and increasing legislative and enforcement interest in the U.S. with respect to drug pricing practices, particularly with respect to drugs that have been subject to relatively large price increases over relatively short time periods. At the federal level,practices. In particular, there have been several recent U.S. Congressional inquiries, hearings and proposed billsand enacted federal legislation and rules, as well as executive orders, designed to, among other things, bringthings: reduce or limit the prices of drugs and make them more transparencyaffordable for patients (including, for example, by tying the prices that Medicare reimburses for physician-administered drugs to drug pricing, review the relationship between pricing and manufacturer patient programs, and reform government program reimbursement methodologies for drugs. Also, the Trump administration’s budget proposal for fiscal year 2019 contains drug price control measures that could be enacted during the 2019 budget process orprices of drugs in other future legislation, including measures to permitcountries); reform the structure and financing of Medicare Part D planspharmaceutical benefits; implement additional data collection and transparency reporting regarding drug pricing, rebates, fees and other remuneration provided by drug manufacturers; enable the government to negotiate prices under Medicare; revise rules associated with the calculation of average manufacturer price of certain drugsand best price under Medicaid; eliminate the AKS discount safe harbor protection for manufacturer rebate arrangements with Medicare Part B,D plan sponsors; create new AKS safe harbors applicable to allow some statescertain point-of-sale discounts to negotiate drug pricespatients and fixed fee administrative fee payment arrangements with pharmacy benefit managers; and revise the rebate methodology under the Medicaid and to eliminate cost sharing for generic drugs for low-income patients. Further,Drug Rebate Program. For instance, President Biden issued an executive order in October 2018, the Centers for Medicare & Medicaid Services (CMS) proposed a rule that would require drug manufacturers to disclose drug prices in television advertisements. While any proposed measure will require authorization through additionalJuly 2021 supporting legislation to become effective,enact some of these drug pricing reforms, and in response, the U.S. Department of Health and Human Services (HHS) released a Comprehensive Plan for Addressing High Drug Prices in September 2021 with specific legislative and administrative policies that Congress could enact to help improve affordability of and the Trump administration have each indicated that they will continueaccess to seek new legislative and/or administrative measures to control drug costs.prescription drugs. At the state level, legislatures have increasingly passed legislation and implemented regulations designed to control pharmaceutical and biologicalbiotherapeutic product pricing, including price or patient reimbursement constraints, discounts, restrictions on certain product access andpricing or reimbursement at the state government level, limitations on discounts to patients, marketing cost disclosure and transparency measures, and, in some cases, policies to encourage importation from other countries (subject to federal approval) and bulk purchasing. Withpurchasing, including the National Medicaid Pooling Initiative. These laws may affect our sales, marketing, and other promotional activities by imposing administrative and compliance burdens on us. In addition, given the lack of clarity with respect to drug pricing transparency, for example, in October 2017, California Governor Jerry Brown signed legislation known as SB-17, which requires, among other provisions, pharmaceutical manufacturers to provide notice of price increases above a defined threshold to certain purchasersthese laws and related reportstheir implementation, our reporting actions could be subject to the government. SB-17 is currently subject to challenge, but inpenalty provisions of the meantime, manufacturers must comply with its requirements.pertinent state and federal authorities.
In theThe U.S., the pharmaceutical industry has already been significantly affectedimpacted by major legislative initiatives and related political contests. For instance, efforts to repeal, substantially modify or invalidate some or all of the provisions of the PPACA, some of which have been successful, create considerable uncertainties for all businesses involved in healthcare, including our own. In addition, there are pending federal and state-level legislative proposals that would significantly expand government-provided health insurance coverage, ranging from establishing a single-payer, national health insurance system to more limited “buy-in” options to existing public health insurance programs, each of which could have a significant impact on the healthcare industry. It is also possible that additional governmental actions will be taken in response to the ongoing COVID-19 pandemic, and that such actions would have a significant impact on these public health insurance programs.
As a result of these developments and trends, third-party payers are increasingly attempting to contain healthcare costs by limiting coverage and the level of reimbursement of new drugs. These entities could refuse, limit or condition
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coverage for our products, such as by using tiered reimbursement or pressing for new forms of contracting, including, for example, the PPACA. Since January 2017, President Trump has signed two Executive Orders designed to delay the implementation of certain provisions of the PPACA or otherwise circumvent some of the requirements for health insurance mandatedmovement by the PPACA. Concurrently, Congress has considered legislation that would repeal or repeal and replace all or part of the PPACA. While Congress has not passed comprehensive repeal legislation, two bills affecting the implementation of certain taxes under the PPACA recently have been enacted. The Tax Cuts and Jobs Act of 2017 includes a provision repealing, effective January 1, 2019, the tax-based shared responsibility payment imposed by the PPACA on certain individuals who fail to maintain qualifying health coverage for all or part of a year that is commonly referred to as the “individual mandate.” Additionally, on January 23, 2018, President Trump signed a continuing resolution on appropriations for fiscal year 2018 that delayed the implementation of certain PPACA-mandated fees, including the so-called “Cadillac” tax on certain high cost employer-sponsored insurance plans, the annual fee imposed on certain health insurance providers based on market share, and the medical device excise tax on non-exempt medical devices. Congress may continue to consider legislation to repeal and replace some or all elements of the PPACA, and in December 2018, a Texas U.S. District

Court Judge ruled that the PPACA is unconstitutional in its entirety because of the repeal of the “individual mandate” that was part of the Tax Cuts and Jobs Act. Although that ruling is being appealed, we cannot predict the outcome of this litigation, including a possible decision by the United States Supreme Court, or whether other healthcare reform initiatives will continue to be pursued or adopted in the future. Further federal, state and foreign legislative and regulatory developments are likely, and we expect ongoing initiatives to increase pressure on drug pricing, which could have a negative impact on our revenue or sales ofinsurers towards “value-based” contracting, any products or future approved products.
Other legislative changes have also been proposed and adopted since the PPACA was enacted. For example, the Budget Control Act of 2011 resulted in aggregate reductions in Medicare payments to providers of up to 2% per fiscal year, starting in 2013, and the American Taxpayer Relief Act of 2012, among other things, reduced Medicare payments to several types of providers and increased the statute of limitations period for the government to recover overpayments to providers from three to five years. Further, in November 2018, CMS proposed a rule that would allow Medicare Part D and Medicare Advantage plans to limit coverage under certain defined circumstances for certain drugs, including cancer medicines, pursuant to exceptions to the existing “protected classes” policy. Such laws or regulations, and others that may affect our business that have been recently enacted or may in the future be enacted, may result in additional reductions in Medicare and other healthcare funding for our products. In the future, there will likely continue to be additional proposals relating to the reform of the U.S. healthcare system, some of which could further limit coverageadversely affect product sales. Due to general uncertainty in the current regulatory and reimbursementhealthcare policy environment, and specifically regarding positions that the Biden Administration may take with respect to these issues, we are unable to predict the impact of drug products,any legislative, regulatory, third-party payer or policy actions, including our approved products and any future approved products. Any reduction in reimbursement from Medicare or other government programs may result in a similar reduction in payments from private payers. The implementation ofpotential cost containment measures or otherand healthcare reforms may prevent us from being able to generate revenue, attain profitability or commercialize our products.reform measures.
In addition, in some non-U.S. jurisdictions,foreign countries, the proposed pricing for a drug must be approved before its cost may be funded within the respective national healthcare system. The requirements governing drug pricing vary widely from country to country. For example, EU member statesMember States may restrict the range of medicinal products for which their national healthcare systems provide reimbursement and may control the prices of medicinal products for human use. A member stateMember State may approve a specific price for the medicinal product or it may instead adopt a system of direct or indirect controls on the profits the medicinal product generates for the company placing it on the market. Pricing and reimbursement negotiations with governmental authorities or payers in EU Member States can take six to 12 months or longer after the initial marketing authorization is granted for a product, or after the marketing authorization for a new indication is granted. To obtain reimbursement and/or pricing approval in some countries, drug manufacturers and collaboration partners may also be required to conduct a study or otherwise provide data that seeks to establish the cost effectiveness of a new drug compared with other available established therapies. Other cost-control initiatives are similarly focused on affordability and accessibility, such as the Regulation on Health Technology Assessment (HTA) adopted in December 2021 and other upcoming legislative and policy changes aimed at increasing cooperation between EU Member States, and once enacted may further impact the price and reimbursement status of many medicinal products. There can be no assurance that any country that has price controls, or reimbursement limitations or other requirements for pharmaceutical products will allow favorable reimbursement and pricing arrangements for any of our products on cost-effectiveness grounds. Historically, products launched in countries in the EU Member States and other non-U.S. jurisdictions do not follow the price structures of the U.S., and they generally tend to be priced significantly lower.
Competition
There are many companies focused on the development of small molecules, antibodies and antibodiesother treatments for cancer. Our competitors and potential competitors include major pharmaceutical and biotechnology companies, as well as academic research institutions, clinical reference laboratories and government agencies that are pursuing research activities similar to ours. Many of the organizations competing with us have greater capital resources, larger research and development staff and facilities, more experience in obtainingdeeper regulatory approvalsexpertise and more extensive product manufacturing and commercial capabilities than we do, which may allowafford them to have a competitive advantage.
Competition for Cabozantinib
We believe that our ability to successfully compete will depend on, among other things:
efficacy, safety and reliability of cabozantinib;cabozantinib, both alone and in combination with other therapies;
timing and scope of regulatory approval;
the speed at which we develop cabozantinib for the treatment of additional tumor types beyond its approved indications;
our ability to complete clinical development and obtain regulatory approvals for cabozantinib;cabozantinib, both alone and in combination with other therapies;
our ability to manufacture and sell commercial quantities of cabozantinib product to the market;
our ability to successfully commercialize cabozantinib, both as a single agent and as part of any combination therapy regimen, and secure coverage and adequate reimbursement in approved indications;
product acceptance by physicians and other health care providers;
the level of our collaboration partners’ investments in the resources necessary to successfully commercialize cabozantinib, or any combination therapy regimen that includes cabozantinib, in territories where it is approved outside of the U.S.; they are approved; 
skills of our employees and our ability to recruit and retain skilled employees;
protection of our intellectual property;property, including our ability to enforce our intellectual property rights against potential generic competition; and

the availability of substantial capital resources to fund development and commercialization activities.
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We believe that the quality and breadth of activity observed with cabozantinib, the skill of our employees and our ability to recruit and retain skilled employees, our patent portfolio and our capabilities for research and drug development are competitive strengths. However, many large pharmaceutical and biotechnology companies have significantly larger intellectual property estates than we do, more substantial capital resources than we have, and greater capabilities and experience than we do in preclinical and clinical development, sales, marketing, manufacturing and regulatory affairs.
The marketsFurthermore, the specific indications for which we intend to pursue regulatory approval ofCABOMETYX is currently or may be approved, based on the results from clinical trials currently evaluating cabozantinib, are highly competitive. WeSeveral novel therapies and combinations of therapies have been approved, are awarein advanced stages of productsclinical development or are under expedited regulatory review in researchthese indications, and these other therapies are currently competing or development by our competitors that are intendedexpected to treat all of the tumor types we are targeting, and should they demonstrate suitable clinical evidence, any of these products may compete with cabozantinib. We believe our future success will depend upon our ability to maintain a competitive position with respect to technological advances and the shifting landscape of therapeutic strategy following the advent of immunotherapy.CABOMETYX. While we have adaptedhad success in adapting our development strategy for the cabozantinib franchise to address the factcompetitive landscape, including through evaluation of therapies that this approachcombine ICIs with other targeted agents, it is uncertain whether current and future clinical trials, including those evaluating cabozantinib in combination with an ICI in HCC, NSCLC and mCRPC, will lead to treating cancer with ICIs,regulatory approvals, or ICIswhether physicians will prescribe regimens containing cabozantinib instead of competing product combinations in approved indications.
Below is a summary of the principal competition for cabozantinib in the indications for which it is approved or for which it has been or is currently being evaluated in potentially label-enabling trials, both as a single agent and in combination with other therapeutic agents, has become highly prevalenttherapies. The information below does not include all competitor products, but rather those approved products that have or we believe may capture significant market share within their respective indications, or with respect to therapies still in indications for which our productsdevelopment, those that are approved, CABOMETYXlikely to overlap with patient populations that are or may become less marketable if our clinical trials fail to show efficacybe treated with cabozantinib or a combination therapy regimen that includes cabozantinib.
Competition in comparison to competing ICI products or ICI product combinations. Furthermore, the complexities of such a strategy has and may continue to require collaboration with some of our competitors.Approved Cabozantinib Indications
CABOMETYX - RCC: We believe the principal competition for CABOMETYX in advanced RCC includes: BMS’ nivolumab;the combination of Merck & Co.’s pembrolizumab and Pfizer’s axitinib; the combination of BMS’s ipilimumab and nivolumab; Pfizer’s axitinib, sunitinib and temsirolimus, each as single-agent therapies; Novartis’ everolimus and pazopanib, each as single-agent therapies; Bayer’s and Onyx Pharmaceuticals’ (a wholly-owned subsidiary of Amgen) (Onyx’s) sorafenib; Roche’s bevacizumab; the combination of Merck & Co.’s pembrolizumab and Eisai’s lenvatinib and Novartis’ everolimus; and Prometheus’ aldesleukin.lenvatinib. Additionally, there are a variety of therapies being developed for advanced RCC, including: the combination of Roche’s bevacizumab and atezolizumab; the combinationPeloton Therapeutics’ (a wholly owned subsidiary of Merck’s pembrolizumabMerck & Co.) belzutifan (also known as MK-6482) and Eisai’s lenvatinib; the combination of Merck’sMerck & Co.’s pembrolizumab, Eisai’s lenvatinib and Pfizer’s axitinib;Peloton Therapeutics’ belzutifan; the combination of Pfizer’s avelumabMerck & Co.’s pembrolizumab and axitinib;quavonlimab and Eisai’s lenvatinib; and the combination of Calithera’s CB-938BMS’ nivolumab and Novartis’ everolimus; AVEO Pharmaceutical’s tivozanib; and generic versions of sorafenib, everolimus and sunitinib.Nektar’s bempegaldesleukin.
The competitive landscape for RCC is evolving rapidly, especially given the entrance and increased adoption of ICI combination therapies and potential entrance of ICI-TKI combination therapies into the RCC treatment landscape, particularly in the first-line setting. This will leadhas led to newchanging trends in prescribing and sequencing of certain drugs and combinations across different lines of therapy. It is therefore difficult to predict how these changes will affect sales of CABOMETYX during 20192022 and going forward.
CABOMETYX - HCC: We believe the principal competition for CABOMETYX in previously treated HCC includes: Bayer’s regorafenib; Bayer’s and Onyx’s sorafenib; BMS’ nivolumab; Eisai’s levantinib; and Merck’s pembrolizumab.lenvatinib. Additionally, there are a variety of therapies being developed for previously treated HCC, including the combination of Roche’s atezolizumab and either Eisai’s Lenvatinib or Bayer’s and Onyx’s sorafenib.
The competitive landscape for HCC has significantly changed with the increased adoption of ICI combination therapies in the first-line setting, which may lead to an increase in prescribing and sequencing of TKIs in subsequent lines of therapy. It is difficult to predict how these changes will affect sales of CABOMETYX during 2022 and going forward.
CABOMETYX - DTC: We believe the principal competition for CABOMETYX in its previously treated DTC indication includes two treatments that are also approved for previously untreated DTC: Bayer’s and Onyx’s sorafenib; and Eisai’s lenvatinib. In addition, we believe there is also competition for CABOMETYX from therapies approved to treat patients with advanced or metastatic RET fusion-positive thyroid cancer who require systemic therapy and who are RAI-refractory (if RAI is appropriate), including: Blueprint Medicine’s and Roche’s pralsetinib; and Loxo Oncology’s (a wholly owned subsidiary of Eli Lilly’s ramucirumab; and generic versionsLilly) selpercatinib.
Other than the approvals of sorafenib.RET inhibitors to treat certain DTC patients, there has been little change in the competitive landscape for RAI-refractory DTC treatments during recent years. Due the limited number of ongoing late-stage clinical trials in this DTC indication, we do not except additional competitors to emerge during 2022.
COMETRIQ:
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COMETRIQ - MTC: We believe that the principal competing anti-cancer therapy to COMETRIQ in progressive, metastatic MTC is Genzyme’s vandetanib, which has been approved by the FDA and the EC for the treatment of symptomatic or progressive MTC in patients with unresectable, locally advanced, or metastatic disease. We believedisease, as well as other therapies that COMETRIQ also faces competition as a treatment for progressive, metastatic MTC from off-label use of certain treatments, including: Bayer’s and Onyx’s sorafenib; Pfizer’s sunitinib; Takeda’s ponatinib; Novartis’ pazopanib; and Eisai’s lenvatinib. Additionally, there are a variety of compounds being developed for MTC with early-stage clinical trials in progress, including: Blueprint Medicine Corporation’s BLU-667 (for certain subsets of MTC patients); and Loxo Oncology, Inc.’s LOXO-292 (which washave been recently granted Breakthrough Therapy Designation by the FDA for the treatment ofapproved to treat patients with advanced or metastatic RET-mutant MTC who require systemic therapy, have progressed following priorincluding: Blueprint Medicine’s and Roche’s pralsetinib; and Loxo Oncology’s selpercatinib.
Other than the recent approvals of RET inhibitors to treat certain MTC patients, there has been little change in the treatment landscape for progressive, metastatic MTC during recent years, and have no acceptable alternative treatment options).due to the limited number of ongoing late-stage clinical trials in this indication, we do not expect many additional competitors to emerge in 2022.
Competition in Potential Cabozantinib Indications Beyond RCC, MTC and previously treated
Cabozantinib in combination with ICI - HCC: We have initiated COSMIC-311, a phase 3 pivotal trial evaluating cabozantinib in patients with DTC who have progressed after up to two prior VEGFR-targeted therapies, and COSMIC-312, athe phase 3 pivotal trial evaluating the combination of cabozantinib and atezolizumab in patients with previously untreated HCC. However, HCC, is continuing as planned to final analysis of OS, and we face a rapidly evolving treatment landscapeintend to submit an sNDA to the FDA for the treatment of both of these indications, as other therapies have recently received regulatory approval or are in advanced stages of clinical development, which may impaircombination regimen if supported by the relative value of CABOMETYX or a combination of CABOMETYX with an ICI in DTC and previously untreated HCC, respectively. Should cabozantinib be approved for this indication of DTC, we believe its principal competition may include: Bayer’s and Onyx’s sorafenib; and Eisai’s lenvatinib.final OS analysis. Should the combination of cabozantinib and atezolizumab be approved for the treatment of patients with previously untreated advanced HCC, we believe its principal competition may include: Eisai’s levantinib; Bayer’s and Onyx’s sorafenib; BMS’s nivolumab; the combination of Merck’sMerck & Co.’s pembrolizumab and Eisai’s lenvatinib; BeiGen and Celgene’s tislelizumab; the combination of Roche’s bevacizumab and atezolizumab;

AstraZeneca’s durvalumab;and the combination of AstraZeneca’s durvalumab and tremelimumab;tremelimumab.
Cabozantinib in combination with ICI – NSCLC: We are evaluating the combination of cabozantinib and atezolizumab in CONTACT-01, a phase 3 pivotal trial evaluating the combination of cabozantinib and atezolizumab in patients with metastatic NSCLC who have been previously treated with an ICI and platinum-containing chemotherapy. Should the combination of cabozantinib and atezolizumab be approved for the treatment of patients with NSCLC, we believe its principal competition may include: Sanofi’s docetaxel; the combination of Sanofi’s docetaxel and Eli Lilly’s ramucirumab; the combination of BMS’ nivolumab and Mirati’s sitravatinib; the combination of Merck & Co.’s pembrolizumab and Eisai’s lenvatinib; Daiichi Sankyo’s DS-1062; and generic versions of sorafenib. Examples of potential competition for cabozantinibdocetaxel.
Cabozantinib in other cancer indications include: other VEGF pathway inhibitors, including Genentech’s bevacizumab and Pfizer’s axitinib; other RET inhibitors including Eisai’s lenvatinib and Takeda’s ponatinib; other MET inhibitors, including Astra Zeneca’s savolitinib, Pfizer’s crizotinib and Mirati’s glesatinib; and ICIs such as BMS’s ipilimumab and nivolumab, Merck’s pembrolizumab and Roche’s atezolizumab.
Competition for Cobimetinib
combination with ICI – mCRPC:We believe that cobimetinib’s principal competition amongst targeted agents includes:are evaluating the combination of Novartis’ trametinibcabozantinib and dabrafenib; andatezolizumab in CONTACT-02, a phase 3 pivotal trial evaluating the combination of Array’s encorafenibcabozantinib and binimetinib. Within the class of ICIs, we believe that cobimetinib’s principal competition includes:atezolizumab in patients with mCRPC who have been previously treated with one NHT. Should the combination of BMS’s ipilimumabcabozantinib and nivolumab; and Merck’s pembrolizumab. The second category, ICIs, are of particular competitive importance vis-a-vis cobimetinib in advanced melanoma as they are already FDAatezolizumab be approved in melanoma patient populations that overlap with those that may be eligible for cobimetinib, they have been rapidly incorporated into the NCCN treatment guidelines, and they are viewed with a high degree of enthusiasm by physicians and key opinion leaders. Ongoing and future trials incorporating ICIs, including combination trials, may further impact usage of cobimetinib in melanoma and potentially in additional tumor types in which cobimetinib may ultimately gain approval.
Competition for Esaxerenone
We believe that esaxerenone’s principal competition for the treatment of hypertensionpatients with mCRPC, we believe its principal competition may include: Janssen Biotech’s (a wholly owned subsidiary of Johnson & Johnson) abiraterone; Astellas Pharma’s and Pfizer’s enzalutamide; Sanofi’s docetaxel; the combination of Merck & Co.’s pembrolizumab and Sanofi’s docetaxel; the combination of Merck & Co.’s pembrolizumab and Astellas Pharma’s and Pfizer’s enzalutamide; the combination of BMS’ nivolumab and Sanofi’s docetaxel; Veru Pharma’s sabizabulin; and generic versions of abiraterone and docetaxel. In addition, we believe there may be competition for the combination of cabozantinib and atezolizumab in Japan will be Bayer’s MR antagonist, finerenone, ifmCRPC from therapies in late-stage development focused on the subset of mCRPC patients who are prostate-specific membrane antigen positive, including: Novartis’ 177Lu-PSMA-617; POINT Biopharma’s 177Lu-PNT2002; Telix International’s 177Lu-DOTA-rosopatamab; and when itCurium US LLC’s 177Lu-PSMA-I&T.
Competition for Cobimetinib and Esaxerenone
There is approved by the MHLW. Finerenone is still in developmentcompetition for this indication,both cobimetinib and results from ongoing clinical studies are not expected during 2019.
Significant Customers
We operate as a single business segment and have operations solelyesaxerenone in the U.S. Duringspecific indications and territories where they are approved, and there are regular new entrants and developments in all aspects of these markets. However, given the year ended December 31, 2018,relatively lesser degree of adoption of these therapies within the broader markets in which they compete and their minimal contribution to our total revenues as out-licensed products, we derived 21% ofdo not believe changes in the competitive landscape in these indications will have a material impact on our revenues from Ipsen, 13% of our revenues from Caremark L.L.C. and 12% of our revenues from affiliates of McKesson Corporation.business.
Patents and Proprietary Rights
We actively seek patent protection in the U.S., EuropeEU and selected other foreign countriesjurisdictions to cover our drug candidates and related technologies. Patents extend for varying periods according to the date of patent filing or grant and the legal term of patents in the various countries where patent protection is obtained. The actual protection afforded by a patent, which can vary from country to country, depends on the type of patent, the scope of its coverage and the availability of legal remedies in the country. We have numerous patents and pending patent applications that relate to methods of screening drug targets, compounds that modulate drug targets, as well as methods of making and using such compounds.
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While many patent applications have been filed relating to the drug candidates that we have developed, the majority of these are not yet issued or allowed. WeTo our knowledge, we own all global patents associated with cabozantinib and cobimetinib, and we either own or have in-licensed all global patents for our other drug candidates, referencedas further described below.
Cabozantinib
Cabozantinib is covered by 10more than 15 issued patents in the U.S., building from U.S. Pat. No. 7,579,473, for the composition-of-mattercomposition of matter of cabozantinib (the ‘473 Patent) and pharmaceutical compositions thereof. This composition of matter patent would expire in September 2024, but we have been granted a patent term extension to extend the term to August 2026. The following table describes the US patents that cover our marketed cabozantinib products, and which are listed in the Orange Book. Except as otherwise noted, the stated expiration dates include any patent term extensions already granted. In addition to the composition of matter patent referenced above, the table includes patents directed to, among other things, particular salts, polymorphs, formulations, or use of the compound in the treatment of specified diseases or conditions. We continue to pursue additional patents and patent term extensions in the U.S. and other territories covering various aspects of our cabozantinib products that may, if issued, extend exclusivity beyond the expiration of the patents listed in the table.
ProductPatent No.General Subject MatterPatent Expiration
CABOMETYX7,579,473Composition of matter2026
8,497,284Methods of treatment2024
8,877,776Salt and polymorphic forms of cabozantinib2030
9,724,342Formulations of cabozantinib2033
10,034,873 Methods of treatment2031
10,039,757Methods of treatment2031
11,091,439 Salt and polymorphic forms of cabozantinib2030
11,091,440 Formulations of cabozantinib2030
11,098,015 Methods of treatment2030
11,141,413 Methods of treatment2037
COMETRIQ7,579,473Composition of matter2026
8,877,776Salt and polymorphic forms of cabozantinib2030
9,717,720Formulations of cabozantinib2032
11,091,439 Salt and polymorphic forms of cabozantinib2030
11,091,440 Formulations of cabozantinib2030
11,098,015 Methods of treatment2030
Given the importance of our intellectual property portfolio to our business operations, we intend to vigorously enforce our rights and defend against challenges that have arisen or may arise with respect to patents and patent applications required for the commercialization of medicines containing cabozantinib. For example, in September 2019, we received a Paragraph IV notice letter regarding an ANDA submitted to the FDA by MSN Pharmaceuticals, Inc. (MSN), requesting approval to market a generic version of CABOMETYX tablets, which MSN then amended with additional Paragraph IV certifications in May 2020 to include the ‘473 Patent and U.S. Patent No. 8,497,284. In response, we filed patent infringement lawsuits against MSN in the United States District Court for the District of Delaware (the Delaware District Court) in October 2019 and May 2020, which were later consolidated and include infringement claims related to the ‘473 Patent and U.S. Patent No. 8,497,284. In addition, in May 2021, we received Paragraph IV certification notice letters regarding an ANDA submitted to the FDA by Teva Pharmaceuticals Development, Inc. and Teva Pharmaceuticals USA, Inc. (individually and collectively referred to as Teva), requesting approval to market a generic version of CABOMETYX tablets. In response, we filed a patent infringement lawsuit against Teva, along with Teva Pharmaceutical Industries Limited (Teva Parent), in the Delaware District Court in June 2021. We cannot predict the outcome of these lawsuits or provide assurance that these lawsuits will prevent the introduction of a generic version of CABOMETYX for any particular length of time, or at all. For a more detailed discussion of these litigation matters, see “Legal Proceedings” in Part I, Item 3 of this Annual Report on Form 10-K.
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ProductPatent No.General Subject MatterPatent Expiration
CABOMETYX7,579,473Composition of matter2026
8,497,284Methods of treatment2024
8,877,776Salt and polymorphic forms of cabozantinib2030
9,724,342Formulations of cabozantinib2033
10,039,757Methods of treatment2031
10,034,873Methods of treatment
2031(1)
COMETRIQ7,579,473Composition of matter2026
8,877,776Salt and polymorphic forms of cabozantinib2030
9,717,720Formulations of cabozantinib2032
____________________
(1)Filed for inclusion in the Orange Book for patients with HCC who have been previously treated with sorafenib
In Europe,the EU, cabozantinib is protected by issued patents covering the composition-of-mattercomposition of matter and methods of use. The issued patent would expire in September 2024, but we have applied for and either have obtained, or expect to obtain Supplementary Protection Certificates in Europethe EU to extend the term to 2029. In addition to the composition of matter patent, the table below includes certain later-expiring patents directed to the commercial product, including, particular salts, polymorphs, formulations, or use of the compound in the treatment of specified diseases or conditions.
ProductPatent No.General Subject MatterPatent Expiration
CABOMETYX2213661Composition of matter and methods of treatment2029
2387563Salt and polymorphic forms of cabozantinib and methods of treatment2030
COMETRIQ2213661Composition of matter and methods of treatment2029
2387563Salt and polymorphic forms of cabozantinib and methods of treatment2030
ProductPatent No.General Subject MatterPatent Expiration
CABOMETYX2213661Composition of matter and methods of treatment2029
2387563Salt and polymorphic forms of cabozantinib and methods of treatment2030
COMETRIQ2213661Composition of matter and methods of treatment2029
2387563Salt and polymorphic forms of cabozantinib and methods of treatment2030

In September 2021, in a final decision before the Technical Board of Appeal, the Opposition Division of the European Patent Office upheld the validity of EP patent 2387563, directed to crystalline forms of cabozantinib malate, pharmaceutical compositions and certain uses thereof. This ruling favors continuing exclusivity of our cabozantinib patent portfolio in the EU through the expiration date of EP patent 2387563 in 2030.
Similarly, in Japan, cabozantinib is protected by an issued patentpatents covering the composition-of-matter,composition of matter, and salts thereof, as well as pharmaceutical compositions and related methods of use. We intend to applyuse, and Takeda has applied for patent term extension in Japan to extend the term to 2029. Foreign counterparts of the issued U.S. and European composition of matter patents have been issued in Australia and Canada and are anticipated to expire in 2024. We have other filed patent applications and issued patents in the U.S. and other selected countries covering certain synthetic methods, salts, polymorphs, formulations, prodrugs, metabolites and combinations of cabozantinib that, if issued, are anticipated to expire as late as 2035.2037. Outside the U.S. and Japan, cabozantinib is licensed to Ipsen;Ipsen, and in Japan, cabozantinib is licensed to Takeda, each in accordance with the respective collaboration agreements. A discussion of risks and uncertainties that may affect our patent position and other proprietary rights is set forth in “Risk Factors,” contained in Part I, Item 1A of this Annual Report on Form 10-K.
Cobimetinib
Cobimetinib is covered by three issued patents in the U.S., including U.S. Pat. No 7,803,839 for the composition of matter of cobimetinib and pharmaceutical compositions thereof. U.S. Pat. No 7,803,839 would normally expire in February 2027, but we have applied for a patent term extension to extend the term to November 2029. Cobimetinib is also covered by an issued patent in Europe (covering the composition-of-matter of cobimetinib and certain methods of use), which would normally expire in October 2026, but we have applied for and are obtaining Supplementary Protection Certificates to extend the term to November 2030. Foreign counterparts of the issued U.S. and European patents are issued or pending in Australia, Canada, Japan and selected other foreign countries. We have filed patent applications in the U.S. and other selected countries covering certain salts and polymorphs of cobimetinib that, if issued, are anticipated to expire in approximately 2036. We have filed patent applications in the U.S. and other selected countries covering certain synthetic methods related to making cobimetinib that, if issued, are anticipated to expire in approximately 2033. Cobimetinib is licensed to Genentech in the U.S. and to Roche outside of the U.S.
Other Drug Candidates
We also have issued patents and pending patent applications, and will continue to file new patent applications, in the U.S., Europethe EU and other selected countries covering the composition-of-matter of our other drug candidates in clinical and/or preclinical

development. We intend to describe these patents in more detail once it is determined that a particular drug candidate warrants further development. development, including XL092, XB002, XL102 and XL114.
We have obtained licenses from various parties that give us rights to technologies that we deem to be necessary or desirable for our research and development. These licenses (both exclusive and non-exclusive) may require us to pay royalties as well as upfront and milestone payments.
We require our scientific personnel to maintain laboratory notebooks and other research records in accordance with our policies, which are designed to strengthen and support our intellectual property protection. In addition to our patented intellectual property, we also rely on trade secrets and other proprietary information, especially when we do not believe that patentprotection is appropriate or can be obtained. We also require all of our employees and consultants, outside scientific collaborators, sponsored researchers and other advisors who receive proprietary information from us to execute confidentiality agreements upon the commencement of employment or consulting relationships with us. These agreements provide that all proprietary information developed or made known to the individual during the course of the individual’s relationship with us is to be kept confidential and not disclosed to third parties except in specific circumstances. Furthermore, our agreements with employees and, in most circumstances, our agreements with consultants, outside scientific collaborators, sponsored researchers and other advisors expressly provide that all inventions, concepts, developments, copyrights, trademarks or other intellectual property developed by an employee during the employment period, or developed by a service provider during the service period or utilizing our proprietary drugs or information, shall be our exclusive property. There can be no assurance, however, that these agreements will provide meaningful protection or adequate remedies for our trade secrets in the event of unauthorized use or disclosure of such information.
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Human Capital Management
Our Employees and Commitment to Diversity, Equity and Inclusion
As of December 31, 2018,2021, we had 484954 full-time equivalent employees, allrepresenting a 23% increase in our employee workforce as compared to December 31, 2020. Of these employees, 509 are members of whichour various research and development teams and 445 are located in the U.S.members of our various commercial and general and administrative teams. Of these employees, 149 hold Ph.D. degrees, 19 hold M.D. (or foreign equivalent) degrees, 30 hold PharmD degrees and 88 hold other professional degrees such as a J.D. or M.B.A. None of our employees are represented by a labor union, and we consider our employee relations to be good.
During the past five years, our employee turnover has remained consistently below average for the U.S. life sciences industry generally. Given our expanding operations and need to further grow our headcount to support our business, we continually assess employee turnover, recruitment initiatives, compensation and benefits programs, safety in performing critical laboratory work, diversity and other matters relevant to human capital management, and we review results with our Board of Directors on a periodic basis.
We are an equal opportunity employer and maintain policies that prohibit unlawful discrimination based on race, color, religion, gender, sexual orientation, gender identity/expression, national origin/ancestry, age, disability, marital and veteran status. We are proud to employ a diverse workforce that, as of December 31, 2021, was 55% non-white and 53% women. In addition, as of December 31, 2021, 50% of our positions that manage other employees directly were held by non-whites and 47% were held by women, and after giving effect to the hiring of our new Chief Medical Officer in January 2022, women made up 33% of our senior leadership team. We strive to build and nurture a culture where all employees feel empowered to be their authentic selves. We respect and appreciate each employee’s unique perspective and experiences, and value their contributions to our mission. It is important that we celebrate, encourage and support similarities and differences to drive innovation for the benefit of our employees, patients and community.
Culture, Compensation and Benefits
At Exelixis, we value being exceptional in what we do and how we lead, excelling for patients by going the extra mile to care for them and exceeding together as a business and contributor to the scientific community. We strive to live these values every day across the company, integrating them into everything from our interview, hiring and onboarding processes, to our performance evaluation, rewards and promotion programs.
We provide generous compensation packages designed to attract and retain high-quality employees, and all of our employees are eligible for cash bonuses and grants of equity awards. We regularly evaluate our compensation programs with an independent compensation consultant and utilize industry benchmarking in an effort to ensure they are competitive compared to similar biotechnology and biopharmaceutical companies with which we compete for talent, as well as fair and equitable across our workforce with respect to gender, race and other personal characteristics. In addition, we are proud to provide a variety of programs and services to help employees meet and balance their needs at work, at home and in life, including an attractive mix of healthcare, insurance and other benefit plans. We deliver a benefits program that is designed to keep our employees and their families healthy, which includes not only medical, dental and vision benefits, but also dependent care, mental health and other wellness benefits. For a discussion of workplace safety measures we have taken, including as a result of the COVID-19 pandemic, see “—Environmental, Health and Safety.”
Beyond compensation and benefits, we also value career development for all employees, and we offer a tuition reimbursement program, as well as professional development courses ranging from technical training, competency-based workshops and leadership development programs facilitated by external partners who are experts in their respective fields. Direct managers also take an active role in identifying individualized development plans to assist their employees in realizing their full potential and creating opportunities for promotions and added responsibilities that enhance the engagement and retention of our workforce.
Corporate Information
We were incorporated in Delaware in November 1994 as Exelixis Pharmaceuticals, Inc. and changed our name to Exelixis, Inc. in February 2000. Our principal executive offices are located at 1851 Harbor Bay Parkway, Alameda, California 94502. Our telephone number is (650) 837-7000. We maintain a site on the worldwide web at www.exelixis.com; however, information found on our website is not incorporated by reference into this report.
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We make available free of charge on or through our website our Securities and Exchange Commission (SEC) filings, including our annual report on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, as soon as reasonably practicable after we electronically file such material with, or furnish it to, the SEC. The SEC maintains a site on the worldwide web that contains reports, proxy and information statements and other information regarding our filings at www.sec.gov.
Item 1A. Risk Factors
In addition to the factorsrisks discussed elsewhere in this report, the following are important factors that make an investment in our securities speculative or risky, and that could cause actual results or events to differ materially from those contained in any forward-looking statements made by us or on our behalf. The risks and uncertainties described below are not the only ones we face. Additional risks and uncertainties not currently known to us or that we deem immaterial also may impair our business operations. If any of the following risks or such other risks actually occur, our business and the value of your investment in our company could be harmed.
Risks Related to the Commercialization of Our Business and IndustryProducts
Our ability to grow our company is critically dependent upon the commercial success of CABOMETYX in its approved indications and the furthercontinued clinical development, regulatory approval, clinical acceptance and commercial success of the cabozantinib franchise in additional indications.
Our mission is to maximize the clinical and commercial potential of cabozantinib, and to position us for future growth through our discovery efforts and expansion of our development pipeline. We anticipate that for the foreseeable future, our ability to maintain or meaningfully increase unrestricted cash flow to fund our commercialbusiness operations and our development and discovery programs is dependentgrowth will depend upon the continued successful commercializationcommercial success of CABOMETYX, for the treatment of RCCboth alone and HCC, in each case in territories where it has been approved and according to the terms of such regulatory approvals. The commercial opportunity for CABOMETYXcombination with other therapies, as a treatment for RCCthe highly competitive indications for which it is approved, and HCC remains subjectpossibly for other indications for which cabozantinib has been or is currently being evaluated in potentially label-enabling clinical trials, if warranted by the data generated from these trials. In this regard, part of our strategy is to a

variety of factors, most importantly, CABOMETYX’s perceived benefit/risk profile as comparedcancer patients who could potentially benefit from this medicine. However, we cannot be certain that the clinical trials we and our collaboration partners are conducting will demonstrate adequate safety and efficacy in these additional indications to receive regulatory approval in the benefit/risk profiles of other treatments available or currentlymajor commercial markets where CABOMETYX is approved. Even if we and our collaboration partners receive the required regulatory approvals to market cabozantinib for additional indications, we and our collaboration partners may not be able to commercialize CABOMETYX effectively and successfully in development for these conditions.additional indications. If revenue from CABOMETYX decreases or remains flat, or if we are unable to expand the number of labeled indications for which CABOMETYX is approved, or if we or our collaboration partners fail to achieve anticipated product royalties and collaboration milestones, we may need to reduce our operating expenses, access other sources of cash or otherwise modify our business plans, which could have a material adverse impact on our business, financial condition and results of operations. Furthermore, as a consequence of our collaboration agreements with Ipsen and Takeda, we rely heavily upon their regulatory, commercial, medical affairs, market access and other expertise and resources for commercialization of CABOMETYX in their respective territories outside of the U.S. We cannot control the amount and timing of resources that our collaborators dedicate to the commercialization of CABOMETYX, or to its marketing and distribution, and our ability to generate revenues from the commercialization of CABOMETYX by our collaborators depends on their ability to obtain and maintain regulatory approvals for, achieve market acceptance of, and to otherwise effectively market, CABOMETYX in its approved indications in their respective territories. Further, foreign sales of CABOMETYX by our collaborators could be adversely affected by the imposition of governmental controls, political and economic instability, trade restrictions or barriers and changes in tariffs, including as a result of the United Kingdom’s (UK) pending withdrawal from the EU (commonly referred to as “Brexit”), escalating global trade and political tensions, or otherwise. If our collaborators are unable to, or do not invest the resources necessary to successfully commercialize CABOMETYX in the EU and other international territories where it has been approved, this could reduce the amount of revenue we are due to receive under these collaboration agreements, thus resulting in harm to our business and operations.
CABOMETYX has been approved for the treatment of advanced RCC in the U.S., the EU and other territories, and for the treatment of previously treated HCC in the U.S. and the EU. Following these approvals, our ability to grow our company remains contingent upon, among other things, further success in the clinical development, regulatory approval and market acceptance of cabozantinib, the active pharmaceutical ingredient in CABOMETYX, in potential additional indications. We cannot be certain that the clinical trials we and our collaboration partners are currently conducting, or may conduct in the future, will demonstrate adequate safety and efficacy in these additional indications to receive regulatory approval. Should we prove unsuccessful in advancing the further clinical development and commercialization of cabozantinib beyond its currently approved indications, we may be unable to execute our business plans, which could have a material adverse impact on our business, financial condition and results of operations. Even if we and our partners receive the required regulatory approvals to market cabozantinib for any additional indications or in additional territories, we and our partners may not be able to effectively commercialize CABOMETYX in these additional indications or territories.
Our ability to grow revenues from sales of CABOMETYX will dependdepends upon the degree of market acceptance among physicians, patients, health carehealthcare payers, and the medical community.
Our ability to increase or maintain revenues from sales of CABOMETYX for its approved indications is, and if approved for additional indications will be, highly dependent upon the extent of market acceptance of CABOMETYX among physicians, patients, foreign and U.S. government health carehealthcare payers such as Medicare and Medicaid, commercial health carehealthcare plans and the medical community. Market acceptance for CABOMETYX could be impacted by numerous factors, including the effectiveness and safety profile, or the perceived effectiveness and safety profile, of CABOMETYX compared to competing products, the strength of CABOMETYX sales and marketing efforts and changes in pricing and reimbursement for CABOMETYX. If CABOMETYX does not continue to be prescribed broadly for the treatment of advanced RCC and achieve market acceptance for the treatment of previously treated HCC, we may not be able to growpatients in its approved indications, our product revenues. The degree of market acceptance of CABOMETYX will depend upon a number of factors, including:
the effectiveness,revenues could flatten or perceived effectiveness, of CABOMETYX in comparison to competing products;
the safety of CABOMETYX, including the existence of serious side effects of CABOMETYX and their severity in comparison to those of competing products;
CABOMETYX’s relative convenience and ease of administration;
potential unexpected results connected with analysis of data from future or ongoing clinical trials of cabozantinib;
the timing of CABOMETYX label expansions for additional indications, if any, relative to competitive treatments;
the price of CABOMETYX relative to competitive therapies;
price increases taken by us and the impact on the net sales price of CABOMETYX as a result of any new laws, regulations or other government initiatives affecting pharmaceutical pricing;
the strength of CABOMETYX sales efforts, marketing, market access and product distribution support;
the sufficiency of commercial and government health insurance coverage and adequacy of reimbursement for CABOMETYX; and
our ability to enforce our intellectual property rights with respect to CABOMETYX.

Further, in the event that any of these or other factors cause market acceptance of CABOMETYX to decrease, this could negatively impact our revenues, which could have a material adverse impact on our business, financial condition and results of operations.
Our competitors may develop products and technologies that impair the relative value of our marketed products and any future product candidates.
The pharmaceutical, biopharmaceutical and biotechnology industries areindustry is competitive highly diversified and are characterized by rapidconstant technological change and diverse offerings of products, particularly in the area of novel oncology therapies. Many of the organizations competing with usour competitors have greater capital resources, larger research and development staff and facilities, more experience in obtainingdeeper regulatory approvalsexpertise and more extensive product manufacturing and commercial capabilities than we do, which may allowafford them to have a competitive advantage. Further, our
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competitors may be more effective at using their technologies to developin-licensing and developing new commercial products. As a result, our competitors may be able to more easily develop products that wouldcould render our products, and those of our collaborators,collaboration partners, obsolete and noncompetitive. There may also be drug candidates that we are not aware of at an earlier stage of development that may compete with our marketed products and product candidates. We face, and will continue to face, intense competition from biotechnology, biopharmaceutical and pharmaceutical companies, as well as academic research institutions, clinical reference laboratories and government agencies that are pursuing scientific and clinical research activities similar to ours. Delays in
Furthermore, the development of cabozantinib for the treatment of additional tumor types, for example, could allow our competitors to bring products to market before us.
Specifically, thespecific indications for which CABOMETYX is currently or may be approved, based on the results from clinical trials currently evaluating cabozantinib, are highly competitive. Several novel therapies and combinations of therapies have been approved, are in advanced stages of clinical development or are under expedited regulatory review in these indications, and these other therapies are currently competing or are expected to compete with CABOMETYX. We believe our future success will depend upon our ability to maintain a competitive position with respect to technological advances and the shifting landscape of therapeutic strategy following the advent of immunotherapy. While we have adaptedhad success in adapting our development strategy for the cabozantinib franchise to address the factcompetitive landscape, including through evaluation of therapies that this approach to treating cancercombine ICIs with ICIsother targeted agents, it is uncertain whether current and future clinical trials, including those evaluating cabozantinib in combination with other therapeutic agents has become highly prevalentan ICI in indications for which our products areHCC, NSCLC and mCRPC, will lead to regulatory approvals, or whether physicians will prescribe regimens containing cabozantinib instead of competing product combinations in approved we cannot ensure that our clinical trials will show efficacy in comparison to competing products or product combinations. Furthermore, the complexities of such a development strategy has and may continue to require collaboration with some of our competitors.
We also may face competition from manufacturers of generic versions of our marketed products, and both Congress and the FDA are seeking to promote generic competition, including through proposals that may limit or reduce the term for patent exclusivity or regulatory exclusivity for branded products. Such generic competition often results in very significant decreases in the overall sales or prices at which branded products can be sold.indications.
If we are unable to maintain or scale adequateincrease our sales, marketing, market access and product distribution capabilities for our products, or enter into or maintain agreements with third parties to do so, we may be unable to maximize product revenues, which could have a material adverse impact on our business, financial condition and results of operations.
Maintaining our sales, marketing, market access and product distribution capabilities requires significant resources, and there are numerous risks involved with managing such amaintaining and continuously improving our commercial organization, including our potential inability to successfully recruit, train, retain and incentivize adequate numbers of qualified and effective sales and marketing personnel. We are competing for talent with numerous commercial-stagecommercial- and precommercial-stage, oncology-focused biotechbiopharmaceutical companies seeking to build out and maintain their commercial organizations, as well as other large pharmaceuticallarger biopharmaceutical organizations that have extensive, well-funded and more experienced sales and marketing operations, and we may be unable to maintain or adequately scale our commercial organization as a result of such competition. If we cannot maintain effective sales, marketing, market access and product distribution capabilities, we may be unable to maximize the commercial potential of CABOMETYX and COMETRIQ in their approved indications. Also, to the extent that the commercial opportunities for CABOMETYX grow over time, we may not properly judgescale the requisite size and experience of our current commercialization teams or the level of distribution necessary to market and sell CABOMETYX successfully in multiplean expanded number of indications. If we are unable to maintain or scale our organizationcommercial function appropriately, or should we have to revert back to primarily telephonic and virtual interactions in lieu of in-person meetings with healthcare professionals for an extended period of time as a result of the COVID-19 pandemic, we may not be able to maximize product revenues, which could have a material adverse impact on our business, financial condition and results of operations.
Our ability to successfully commercialize our products will depend, in part, on the extent to which we are able to adequately distribute the products to eligible patients. We currently rely on third-party providers to handle storage and distribution for our commercial supplies of both CABOMETYX and COMETRIQ in the U.S. Furthermore, we rely on our

collaboration partners for ongoing and further commercialization and distribution of CABOMETYX and COMETRIQ in their respective territories outside of the U.S., as well as for access and distribution activities for the approved products under named patient use programs (or similar programs) with the effect of introducing earlier patient access to CABOMETYX and COMETRIQ.
Our current and anticipated future dependence upon the activities, support, and legal and regulatory compliance of third parties may adversely affect our ability to supply CABOMETYX and COMETRIQ to the marketplace on a timely and competitive basis. These third parties may not provide services in the time required to meet our commercial timelines and objectives or to meet regulatory requirements. We may not be able to maintain or renew our arrangements with third parties, or enter into new arrangements, on acceptable terms, or at all. Third parties could terminate or decline to renew our arrangements based on their own business priorities. If we are unable to contract for these third-party services related to the distribution of CABOMETYXobtain or maintain coverage and COMETRIQ on acceptable terms, our commercialization efforts and those of our collaboration partners may be delayed or otherwise adversely affected, which could have a material adverse impact on our business, financial condition and results of operations.
If we are unable to maintain or obtainreimbursement for our products both sufficient health insurance coverage and adequate reimbursement from third-party payers, our business will suffer.
Our ability to commercialize our products successfully is highly dependent on the extent to which health insurance coverage and adequate reimbursement is, and will be, available from third-party payers, including foreign and U.S. governmental payers, such as Medicare and Medicaid, and private health insurers. Third-party payers continue to scrutinize and manage access to pharmaceutical products and services and may limit reimbursement for newly approved products and indications. Patients mayare generally not be capable of paying for CABOMETYX or COMETRIQ themselves and may rely on third-party payers to pay for, or subsidize, the costs of their medications, among other medical costs. Accordingly, market acceptance of CABOMETYX and COMETRIQ is dependent on the extent to which coverage and reimbursement is available from third-party payers. These entities could refuse, limit or condition coverage for our products, such as by using tiered reimbursement or pressing for new forms of contracting. If third-party payers do not provide coverage or adequate reimbursement for CABOMETYX or COMETRIQ, our revenues and results of operations will suffer. In addition, even if third-party payers provide some coverage or reimbursement for CABOMETYX or COMETRIQ, the availability of such coverage or reimbursement for prescription drugs under private health insurance and managed care plans, which often varies based on the type of contract or plan purchased, may not be sufficient for patients to afford CABOMETYX or COMETRIQ. Third-party payers continue to scrutinize and manage the prices charged for pharmaceutical products and services, and many also limit reimbursement for newly-approved products and indications.
We are subject to certain healthcare laws, regulations and enforcement; our failure to comply with those laws could have a material adverse impact on our business, financial condition and results of operations.
We are subject to certain healthcare laws and regulations and enforcement by the federal government and the states in which we conduct our business. Should our compliance controls prove ineffective at preventing or mitigating the risk and impact of improper conduct or inaccurate reporting, the laws that may affect our ability to operate include, without limitation:
the federal Anti-Kickback Statute (AKS), which governs our business activities, including our marketing practices, medical educational programs, pricing policies, and relationships with healthcare providers or other entities. The AKS has been broadly interpreted to apply to manufacturer arrangements with prescribers, purchasers and formulary managers, among others. Among other things, this statute prohibits persons and entities from knowingly and willfully soliciting, receiving, offering or paying remuneration, directly or indirectly, in exchange for or to induce either the referral of an individual for, or the purchase, order or recommendation of, any good or service for which payment may be made under federal healthcare programs such as the Medicare and Medicaid programs. Remuneration is not defined in the AKS and has been broadly interpreted to include anything of value, including for example, gifts, discounts, coupons, the furnishing of supplies or equipment, credit arrangements, payments of cash, waivers of payments, ownership interests, value-added services to customers, and providing anything at less than its fair market value;
the FDCA and its implementing regulations, which prohibit, among other things, the introduction or delivery for introduction into interstate commerce of any drug that is adulterated or misbranded;
federal civil and criminal false claims laws, including the civil False Claims Act, and civil monetary penalty laws, which prohibit, among other things, individuals or entities from knowingly presenting, or causing to be presented, claims for payment from Medicare, Medicaid, or other third-party payers that are false or fraudulent, or making a false statement to avoid, decrease or conceal an obligation to pay money to the federal government;
federal criminal laws that prohibit executing a scheme to defraud any healthcare benefit program or making false statements relating to healthcare matters;

HIPAA and its implementing regulations, which impose certain requirements relating to the privacy, security and transmission of individually identifiable health information on covered entities and business associates that access such information on behalf of a covered entity;
state law equivalents of each of the above federal laws, such as anti-kickback and false claims laws, which may apply to items or services reimbursed by any third-party payer, including commercial insurers, and state laws governing the privacy and security of health information in certain circumstances, many of which differ from each other in significant ways and may not have the same effect, thus complicating compliance efforts;
the PPACA Open Payments program created under the Physician Payments Sunshine Act and its implementing regulations, which requires certain manufacturers of drugs, devices, biologics and medical supplies that are reimbursable under Medicare, Medicaid, or the Children’s Health Insurance Program, with specific exceptions, to report annually to the government information related to certain payments and other transfers of value to physicians and teaching hospitals, as well as ownership and investment interests held by physicians and their immediate family members;
state laws and regulations that require drug manufacturers to file reports relating to pricing and marketing information, which requires tracking gifts and other remuneration and items of value provided to healthcare professionals and entities, as well as state and local laws requiring the registration of pharmaceutical sales representatives;
the Foreign Corrupt Practices Act, a U.S. law which regulates certain financial relationships with foreign government officials (which could include, for example, certain medical professionals) and its foreign equivalents;
federal and state consumer protection and unfair competition laws, which broadly regulate marketplace activities and activities that potentially harm consumers; and
federal, state and municipal pharmaceutical price and price reporting laws, both existing (e.g., California’s SB-17) and under consideration, which require or propose to require us to provide notice of price increases and/or file complex ancillary reports concerning prices and pricing and discount practices. The legal and regulatory landscape, and associated compliance obligations imposed on pharmaceutical companies, may increase general and administrative costs, cause revenue fluctuations due to speculative buying practices by purchasers, or diminish our revenues as a result of the imposition of caps on pricing and price increases.
These federal and state healthcare fraud and abuse laws, FDA rules and regulations, as well as false claims laws, including the civil False Claims Act, govern certain marketing practices, including off-label promotion. If our operations are found to be in violation of any of the laws described above or any other governmental regulations that apply to us, we, or our officers or employees, may be subject to penalties, including administrative civil and criminal penalties, damages, fines, regulatory penalties, the curtailment or restructuring of our operations, exclusion from participation in Medicare, Medicaid and other federal and state healthcare programs, reputational harm, additional reporting requirements and oversight if we become subject to a corporate integrity agreement or similar agreement, any of which would adversely affect our ability to sell our products and operate our business and also adversely affect our financial results. Of particular concern are suits filed under the civil False Claims Act, known as “qui tam” actions, which can be brought by any individual on behalf of the government. These individuals, commonly known as relators or “whistleblowers,” may potentially then share in amounts paid by the entity to the government in fines or settlement. The filing of qui tam actions has caused a number of pharmaceutical, medical device and other healthcare companies to have to defend civil False Claims Act actions. When an entity is determined to have violated the civil False Claims Act, it may be required to pay up to three times the actual damages sustained by the government, plus civil penalties for each separate false claim. Defending against any such actions can be costly, time-consuming and may require significant financial and personnel resources. Therefore, even if we are successful in defending against any such actions that may be brought against us, our business may be impaired.
Current healthcare laws and regulations in the U.S. and future legislative or regulatory reforms to the U.S. healthcare system may affect our ability to commercialize our marketed products profitably.
TheFederal and state governments in the U.S. and some foreign jurisdictions are considering or have enacted a number of legislative and regulatory proposals to change the U.S. healthcare system in ways that could affect our ability to continue to commercialize CABOMETYX and COMETRIQ profitably. AmongSimilarly, among policy makers and payers, in the U.S. and elsewhere, there is significant interest in promoting such changes in healthcare systems with the stated goals of containing healthcare costs, improving quality and/orand expanding patient access. InThe life sciences industry and specifically the U.S.,
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market for the pharmaceutical industrysale, insurance coverage and distribution of pharmaceuticals has been a particular focus of these efforts and has beenwould likely be significantly affected by any major legislative or regulatory initiatives.

Specifically, we may face uncertainties as a result of executive, legislative and administrativeFor instance, efforts to repeal, substantially modify or invalidate some or all of the provisions of the PPACA. On December 14, 2018, a Texas U.S. District Court Judge ruledPPACA, some of which have been successful, create considerable uncertainties for all businesses involved in healthcare, including our own. Although such efforts have not significantly impacted our business to date, it is possible that the PPACA is unconstitutional in its entirety because the “individual mandate” was repealed by Congress as part of the Tax Cuts and Jobs Act of 2017. While the Texas District Court Judge, as well as the Trump Administration and CMS, have stated that the ruling will have no immediate effect pending an appeal of the decision, it is unclear how this decision, subsequent appeals and other effortsbe subject to repeal and replace the PPACA will impact the PPACA. There is no assurance that the PPACA, as currently enactedadditional judicial or as amendedlegislative challenges in the future, will notwhich may have a material adverse impact on our business, financial condition and results of operations, and we cannot predict how future healthcare reform measures of the Biden Administration and federal or state legislative or administrative changes relating to healthcare reform will affect our business. The Trump Administration has also indicated an intention to regulate prescription drug pricing,
In addition, there are pending federal and recent Congressional hearings have brought increased public attention to the costs of prescription drugs. These actions and the uncertainty about the future of the PPACA and healthcare laws may put downward pressure on pharmaceutical pricing and increase our regulatory burdens and operating costs.
In August 2017, President Trump signed the FDA Reauthorization Act of 2017, which will reauthorize the FDA user fee programs for prescription drugs, generic drugs, medical devices, and biosimilars, under which manufacturers of such products partially pay for the FDA’s pre-market review of their product candidates. The legislation includes, inter alia, measures to expedite the development and approval of generic products, where generic competition is lacking even in the absence of exclusivities or listed patents. The FDA has also released a Drug Competition Action Plan, which proposes actions to broaden access to generic drugs and lower consumers’ health care costs by, among other things, improving the efficiency of the generic drug approval process and supporting the development of complex generic drugs, and the FDA has taken steps to implement this plan. Moreover, both Congress and the FDA are considering variousstate-level legislative and regulatory proposals that would limit or reducesignificantly expand government-provided health insurance coverage, ranging from establishing a single-payer, national health insurance system to more limited “buy-in” options to existing public health insurance programs, each of which could have a significant impact on the term for patent exclusivity or regulatory exclusivityhealthcare industry. It is also possible that additional governmental actions will be taken in response to the biopharmaceutical industry.ongoing COVID-19 pandemic, and that such actions would have a significant impact on these public health insurance programs. While we cannot currently predict the specific outcome or impact onhow future legislation (or enacted legislation that has yet to be implemented) will affect our business, of such regulatory actions or legislation, they doproposals could have the potential to facilitate the developmentimpact access to and future approval of generic versionssales of our products or otherwise limit or reduceproducts. Furthermore, the termexpansion of the 340B Program has increased the number of purchasers who are eligible for significant discounts on branded drugs, including our market exclusivity, which could result in very significant decreasesmarketed products. Because we participate in the overall sales or prices340B Program to sell a portion of our marketed products, and materially harm our business and financial condition.
As a resultchanges in the administration of the overall trend towards cost-effectiveness criteriaprogram could have a material adverse impact on our revenues, including the implementation of the program’s Administrative Dispute Resolution Process, which is in part intended to resolve claims by covered entities that manufacturers have overcharged them for covered outpatient drugs, and managed healthcare in the U.S., third-party payers are increasingly attempting to contain healthcare costs by limiting both coverage and the level of reimbursement of new drugs. Insurers also continue to pursue means of contracting for pharmaceutical “value” or “outcomes.” These entities could refuse or limit coverage for CABOMETYX and COMETRIQ, such as by using tiered reimbursement or pressing for new forms of value-based contracting, which would adversely affect demand for CABOMETYX and COMETRIQ. They may also refuse to provide coverage for uses of CABOMETYX and COMETRIQ for medical indications other than those for which the FDA has granted market approval. AsOffice of Management and Budget initiated review of a result, significant uncertainty exists as to whether and how much third-party payers will cover newly approved drugs, whichnew proposed rule titled “340B Drug Pricing Program; Administrative Dispute Resolution” in turn will put pressure on the pricing of drugs.November 2021. Due to the volatilitygeneral uncertainty in the current economicregulatory and market dynamics,healthcare policy environment, and specifically regarding positions that the Biden Administration may take with respect to these issues, we are unable to predict the impact of any unforeseen or unknown legislative, regulatory, third-party payer or policy actions, which may includeincluding potential cost containment and healthcare reform measures. These policy actions couldIf enacted, we and any third parties we may engage may be unable to adapt to any changes implemented as a result of such measures, and we may have difficulties in sustaining profitability or otherwise experience a material adverse impact on our business, financial condition and results of operations.
Pricing for pharmaceutical products in the U.S. has come under increasing attention and scrutiny by federal and state governments, legislative bodies and enforcement agencies. These activitiesThis may result in actions that have the effect of reducing our revenue or harming our business or reputation.
Many companies in our industry have received a governmental request for documents and information relatingThere continue to drug pricing and patient support programs. Requests could originate in various forms, including through a Congressional inquiry (e.g., from the U.S. Senate Finance Committee) or a subpoena from the U.S. Department of Justice. We could receive a similar request, which would require us to incur significant expense and result in distraction for our management team. Additionally, to the extent there are findings, or even allegations, of improper conduct on the part of the company, these findings could further harm our business, reputation and/or prospects. It is possible that these inquiries could result in: negative publicity or other negative actions that could harm our reputation; changes in our product pricing and distribution strategies; reduced demand for our approved products; and/or reduced reimbursement of approved products, including by federal health care programs such as Medicare and Medicaid and state health care programs.
Specifically, there have been several recentbe U.S. Congressional inquiries, hearings and proposed and enacted federal legislation and rules, as well as executive orders, designed to, among other things, bring more transparency to drug pricing (including requirements for pharmaceutical manufacturers to report price increases and provide a public justification for these increases if they exceed certain benchmarks), reviewthings: reduce or limit the relationship between pricing and manufacturer patient programs, reduce the priceprices of drugs

under Medicare, reform government program reimbursement methodologies for drugs and facilitate value-based arrangements between manufacturers and payers. Also,make them more affordable for patients (including, for example, by tying the Trump Administration’s budget proposalprices that Medicare reimburses for fiscal year 2019 contains drug price control measures that could be enacted duringphysician-administered drugs to the 2019 budget process orprices of drugs in other future legislation, including measures to permitcountries); reform the structure and financing of Medicare Part D planspharmaceutical benefits; implement additional data collection and transparency reporting regarding drug pricing, rebates, fees and other remuneration provided by drug manufacturers; enable the government to negotiate prices under Medicare; revise rules associated with the calculation of average manufacturer price of certain drugsand best price under Medicaid; eliminate the AKS discount safe harbor protection for manufacturer rebate arrangements with Medicare Part B,D plan sponsors; create new AKS safe harbors applicable to allow some statescertain point-of-sale discounts to negotiate drug pricespatients and fixed fee administrative fee payment arrangements with pharmacy benefit managers; and revise the rebate methodology under the Medicaid and to eliminate cost sharing for generic drugs for low-income patients. While any proposed measures will require authorization through additionalDrug Rebate Program. For instance, President Biden issued an executive order in July 2021 supporting legislation to become effective, bothenact some of these drug pricing reforms, and in response, HHS released a Comprehensive Plan for Addressing High Drug Prices in September 2021 with specific legislative and administrative policies that Congress could enact to help improve affordability of and access to prescription drugs. While we cannot know the Trump Administration have indicated that it will continue to seek newfinal form or timing of any such legislative, regulatory and/or administrative measures, to control drug costs. For example, in October 2018, CMS proposedsome of the pending and enacted legislative proposals or executive rulemaking if implemented without successful legal challenges, would likely have a rule that would require drug manufacturers to disclose drug prices in television advertisements,significant and in November 2018, CMS proposedfar-reaching impact on the biopharmaceutical industry and therefore also likely have a rule that would allow Medicare Part Dmaterial adverse impact on our business, financial condition and Medicare Advantage plans to limit coverage under certain defined circumstances for certain drugs, including cancer medicines, pursuant to exceptions to the existing “protected classes” policy. In addition, the U.S. Departmentresults of Health and Human Services (HHS) Office of Inspector General has solicited input for proposed rulemaking related to the potential addition of “safe harbor” regulations for the AKS. This solicitation aims, among other things, at changes to pharmaceutical contracting and discounting (including potentially encouraging value-based contracting). We cannot know what form any final regulations promulgated by CMS or the HHS Office of Inspector General might look like or how they could affect our business.operations.
At the state level, legislatures have increasingly passed legislation and implemented regulations designed to control pharmaceutical and biologicalbiotherapeutic product pricing, including price or patient reimbursement constraints, discounts, restrictions on certain product access andpricing or reimbursement at the state government level, limitations on discounts to patients, marketing cost disclosure and transparency measures, and, in some cases, policies to encourage importation from other countries (subject to federal approval) and bulk purchasing, including
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the National Medicaid Pooling Initiative. With respectIn particular, the obligation to drug pricing transparency, for example, in October 2017, California Governor Jerry Brown signed SB-17, which requires, among other provisions, pharmaceutical manufacturers to provide notice of price increases above a defined threshold to certain purchasers and related reports to the government. SB-17 is currently subject to challenge, but in the meantime, manufacturers must comply with its requirements. We do not know what form legislative proposals concerning drug prices may take in other states or how they would affect us. It is possible that these laws would encourage federal and state healthcare programs to reduce the amount of reimbursements they provide for prescription drugs, and any reduction in reimbursement from these government healthcare programs may result in a similar reduction in payments from private payers. We also believe that pricing transparency requirements, such as the requirement for us, in certain circumstances, to provide lengthy notices of price increases to purchasers under laws such as California’s SB-17 may influence customer ordering patterns for CABOMETYX and COMETRIQ, and that this,which in turn may increase the volatility of our revenues as a reflection of changes in inventory volumes. Therefore, the implementationFurthermore, adoption of these costdrug pricing transparency regulations, and our associated compliance obligations, may increase our general and administrative costs and/or diminish our revenues. Implementation of these federal and/or state cost-containment measures or other healthcare reforms may result in fluctuations in our results of operations and limit our ability to generate product revenue or commercialize our current products, and in the case of drug pricing transparency regulations, may result in fluctuations in our results of operations.
Lengthy regulatory pricing and reimbursement procedures and cost control initiatives imposed by governments outside the U.S. could delay the marketing of and/or those for which we may receive regulatory approvalresult in downward pressure on the future.price of our approved products, resulting in a decrease in revenue.
Further, in some foreign countries, particularlyOutside the U.S., including major markets in the EU and Japan, the pricing and reimbursement of prescription pharmaceuticals is generally subject to governmental control under the respective national health system.control. In these EU countries, pricing and reimbursement negotiations with governmental authorities or payers can take six to twelve12 months or longer after the initial marketing authorization is granted for a product, or after the marketing authorization for a new indication is granted. This can substantially delay broad availability of the product. To obtain reimbursement and/or pricing approval in some countries, our collaboration partner,partners Ipsen and Takeda may also be required to conduct a study or otherwise provide data that seeks to establish the cost effectiveness of CABOMETYX compared with other available established therapies. The conduct of such a study could also result in delays in the commercialization of CABOMETYX.
Additionally, cost-control initiatives, increasingly based on affordability and accessibility, as well as post-marketing assessments of the added value of CABOMETYX and COMETRIQ as compared to existing treatments, could decreaseinfluence the priceprices paid for and net revenues we realize from CABOMETYX and our collaboration partner, Ipsen, might establishCOMETRIQ, or the indications for CABOMETYX,which we are able to obtain reimbursement, which would result in lower license revenues to us.
Enhanced governmental Upcoming legislative and private scrutiny over, or investigations or litigation involving, pharmaceutical manufacturer donations to patient assistance programs offered by charitable foundations may require us to modify our programs and could negatively impact our business practices, harm our reputation, divert the attention of management and increase our expenses.
To help patients afford our products, we have a patient assistance program and also occasionally make donations to independent charitable foundations that help financially needy patients. These types of programs designed to assist patients in affording pharmaceuticals have become the subject of scrutiny. In recent years, some pharmaceutical manufacturers were named in class action lawsuits challenging the legality of their patient assistance programs and support of independent charitable patient support foundations under a variety of federal and state laws. Our patient assistance program and support of independent charitable foundations could become the target of similar litigation. At least one insurer also has directed its network pharmacies to no longer accept manufacturer co-payment coupons for certain

specialty drugs the insurer identified. In addition, certain state and federal enforcement authorities and members of Congress have initiated inquiries about co-pay assistance programs. Some state legislatures have also been considering proposals that would restrict or ban co-pay coupons.
In addition, there has been regulatory review and enhanced government scrutiny of donations by pharmaceutical companies to patient assistance programs operated by charitable foundations. The HHS Office of Inspector General has established specific guidelines permitting pharmaceutical manufacturers to make donations to charitable organizations who provide co-pay assistance to Medicare patients, provided that such organizations are bona fide charities, are entirely independent of and not controlled by the manufacturer, provide aid to applicants on a first-come basis according to consistent financial criteria, and do not link aid to use of a donor’s product. If we are deemed not to have complied with laws or regulationspolicy changes in the operationEU are aimed at increasing cooperation between the EU Member States. Such initiatives, particularly the HTA adopted in December 2021, may further impact the price and reimbursement status of these programs, we could be subject to damages, fines, penalties or other criminal, civil or administrative sanctions or enforcement actions. Further, numerous organizations, including pharmaceutical manufacturers, have received subpoenas from the U.S. Department of JusticeCABOMETYX and other enforcement authorities seeking information related to their patient assistance programs and support, and certain of these organizations have entered into, or have otherwise agreed to, significant civil settlements with applicable enforcement authorities. In connection with these civil settlements, the U.S. government has and mayCOMETRIQ in the future require the affected companies to enter into complex corporate integrity agreements that impose significant reporting and other requirements on those companies. We cannot ensure that our compliance controls, policies and procedures will be sufficient to protect against acts of our employees, business partners or vendors that may violate the laws or regulations of the jurisdictions in which we operate. Regardless of whether we have complied with the law, a government investigation could negatively impact our business practices, harm our reputation, divert the attention of management and increase our expenses.
We are subject to government regulations relating to privacy and data protection that have required us to modify certain of our policies and procedures with respect to the collection and processing of personal data, and future regulations may cause us to incur additional expenses or otherwise limit our ability to collect and process personal data. Failure to maintain compliance with these regulations could jeopardize certain business transactions and create additional liabilities for us.future.
The entrance of generic competitors and legislative and regulatory landscape for privacyaction designed to reduce barriers to the development, approval and data protectionadoption of generic drugs in the U.S. continues to evolve, and there has been an increasing amount of focuscould limit the revenue we derive from our products, most notably CABOMETYX, which could have a material adverse impact on privacy and data protection issues with the potential to affect our business, including state security breach notification laws, state health information privacy lawsfinancial condition and federal and state consumer protection laws, that govern the collection, use and disclosureresults of personal information. For example, in June 2018, California Governor Jerry Brown signed the CCPA, which takes effect on January 1, 2020 and will broadly define personal information, give California residents expanded privacy rights and protections and provide for civil penalties for violations and a private right of action for data breaches. There are similar legislative proposals being advanced in other states, as well as in Congress. In addition, most healthcare providers who are expected to prescribe our products, and from whom we obtain patient health information, are subject to privacy and security requirements under HIPAA. Although we are not directly subject to HIPAA, we could be subject to criminal penalties if we knowingly obtain individually identifiable health information from a HIPAA-covered entity in a manner that is not authorized or permitted by HIPAA. Other countries also have, or are developing, laws governing the collection, use and transmission of personal information. For example, the EU Data Privacy Directive (95/46/EC) and implementing legislation in the various national Member States of the EU was replaced on May 25, 2018 by the more restrictive GDPR, which now regulates the processing of personal data within the EU and between countries in the EU and countries outside of the EU, including the U.S. Switzerland is updating the Swiss Data Protection Act, and updates to data protection laws in other countries may occur in due course. In connection with these new laws, in particular the CCPA and GDPR, we have modified certain of our policies and procedures with respect to the collection and processing of personal data to the extent necessary given our operations and commensurate with similar companies in our industry. We will continue to review all future privacy and other regulations implemented pursuant to the CCPA, GDPR and other applicable laws to assess whether additional procedural safeguards are warranted, which may cause us to incur additional expenses or otherwise limit our ability to collect and process personal data. Failure to provide adequate privacy protections and maintain compliance with these laws and regulations could jeopardize certain domestic and cross-border business transactions and create additional liabilities for us, including the imposition of sanctions or other penalties, as well as increase our cost of doing business.
If competitors use litigation and regulatory means to obtain approval for generic versions of our marketed products, our business will suffer.operations.
Under the FDCA, the FDA can approve an ANDA for a generic version of a branded drug without the applicant undertaking the human clinical testing necessary to obtain approval to market a new drug. The FDA can also approve a

505(b)(2) NDAthe FDCA that relies in whole or in part on the agency’s findings of safety and/or effectiveness for a previously approved drug.drug, where at least some of the information required for approval comes from studies not conducted by or for the applicant and for which the applicant has not obtained a right of reference or use. Both the ANDA and 505(b)(2) NDA processes are discussed in more detail above in “Item 1. Business” under the heading "Government Regulation-The Hatch-Waxman Act.”Business—Government Regulation—FDA Review and Approval—Abbreviated FDA Approval Pathways and Generic Products” in this Annual Report on Form 10-K. In either case, if an ANDA or 505(b)(2) NDA applicant submits an application referencing one of our drugsmarketed products prior to the expiry of one or more listedour Orange Book-listed patents for the drug,applicable product, we may end up engaging in litigationlitigate with the potential generic competitor to protect our patent rights, which would require us to incur significant expense and result in distraction for oursubstantial costs, divert the attention of management, team, and could also have an adverse impact on our stock price. Moreover, if any suchFor example, MSN and Teva have separately submitted ANDAs to the FDA requesting approval to market their respective generic versions of CABOMETYX tablets, and we have subsequently filed patent lawsuits against both companies. For a more detailed discussion of these litigation matters, see “Legal Proceedings” in Part I, Item 3 of this Annual Report on Form 10-K. It is possible that MSN, Teva or other companies, following FDA approval of an ANDA or 505(b)(2) NDAs were to be approved, and if our listed patents covering cabozantinib were held to be invalid (or if any such competingNDA, could introduce generic or otherwise competitor versions of cabozantinib were foundour marketed products before our patents expire if they do not to infringe our patents),patents or if it is determined that our patents are invalid or unenforceable, and we expect that generic cabozantinib products would havebe offered at a significantly lower price compared to our marketed cabozantinib products. Therefore, regardless of the regulatory approach, the introduction of a generic competitors inversion of cabozantinib would likely decrease our revenues derived from the market,U.S. sales of CABOMETYX and the resulting generic competition would negatively affectthereby materially harm our business, financial condition and results of operations. In particular,There are also equivalent procedures in the EU permitting authorization of generic cabozantinibversions and biosimilars of medicinal products would be significantly less costly than oursauthorized in the EU once related data and market exclusivity periods have expired.
The U.S. federal government has also taken numerous legislative and regulatory actions to bringexpedite the development and approval of generic drugs and biosimilars. Both Congress and the FDA are considering, and have enacted,
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various legislative and regulatory proposals focused on drug competition, including legislation focused on drug patenting and provision of drug to market. Companiesgeneric applicants for testing. For example, the Ensuring Innovation Act, enacted in April 2021, amended the FDA’s statutory authority for granting NCE exclusivity to reflect the agency’s existing regulations and longstanding interpretation that produceaward NCE exclusivity based on a drug’s active moiety, as opposed to its active ingredient, which is intended to limit the applicability of NCE exclusivity, thereby potentially facilitating generic equivalents are generally ablecompetition. The FDA has also released a Drug Competition Action Plan, which proposes actions to offer their products atbroaden access to generic drugs and lower prices. Thus, regardlessconsumers’ healthcare costs by, among other things, improving the efficiency of the generic drug approval process and supporting the development of complex generic drugs. In addition, the Further Consolidated Appropriations Act, 2020, which incorporated the framework from the CREATES legislation, purports to promote competition in the market for drugs and biotherapeutic products by facilitating the timely entry of lower-cost generic and biosimilar versions of those drugs and biotherapeutic products, including by allowing ANDA, 505(b)(2) NDA or biosimilar developers to obtain access to branded drug and biotherapeutic product samples. While the full impact of these provisions is unclear at this time, its provisions do have the potential to facilitate the development and future approval of generic versions of our products, introducing generic competition that could have a material adverse impact on our business, financial condition and results of operations.
Risks Related to Healthcare Regulatory and Other Legal Compliance Matters
We are subject to healthcare laws, regulations and enforcement; our failure to comply with those laws could have a material adverse impact on our business, financial condition and results of operations.
We are subject to federal and state healthcare laws and regulations, which laws and regulations are enforced by the federal government and the states in which we conduct our business. Should our compliance controls prove ineffective at preventing or mitigating the risk and impact of improper business conduct or inaccurate reporting, we could be subject to enforcement of the following, including, without limitation:
the federal AKS;
the FDCA and its implementing regulations;
federal civil and criminal false claims laws, including the civil False Claims Act, and the Civil Monetary Penalties Law;
federal criminal laws that prohibit executing a scheme to defraud any healthcare benefit program or making false statements relating to healthcare matters;
HIPAA and its implementing regulations, as amended;
state law equivalents of each of the above federal laws;
the Open Payments program of the PPACA;
state and local laws and regulations that require drug manufacturers to file reports relating to marketing activities, payments and other remuneration and items of value provided to healthcare professionals and entities; and
state and federal pharmaceutical price and price reporting laws and regulations.
In addition, we may be subject to the Foreign Corrupt Practices Act, a U.S. law which regulates certain financial relationships with foreign government officials (which could include, for example, medical professionals employed by national healthcare programs) and its foreign equivalents, as well as federal and state consumer protection and unfair competition laws.
These federal and state healthcare laws and regulations govern drug marketing practices, including off-label promotion. If our operations are found, or even alleged, to be in violation of the laws described above or other governmental regulations that apply to us, we, or our officers or employees, may be subject to significant penalties, including administrative civil and criminal penalties, damages, fines, regulatory approval pathway,penalties, the introductioncurtailment or restructuring of a generic version ofour operations, exclusion from participation in Medicare, Medicaid and other federal and state healthcare programs, imprisonment, reputational harm, additional reporting requirements and oversight, any of which would adversely affect our marketedability to sell our products and operate our business and also adversely affect our financial results. Furthermore, responding to any such allegation and/or defending against any such enforcement actions can be time-consuming and would require significant financial and personnel resources. Therefore, if any state or the federal government initiates an enforcement action against us, our business may be impaired, and even if we are ultimately successful in our defense, litigating these actions could result in verysubstantial costs and divert the attention of management.
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Enhanced governmental and private scrutiny over, or investigations or litigation involving, pharmaceutical manufacturer patient assistance programs and donations to patient assistance foundations created by charitable organizations could negatively impact our business practices, harm our reputation, divert the attention of management and increase our expenses.
To help patients afford our products, we have a patient assistance program and also occasionally make donations to independent charitable foundations that help financially needy patients. These types of programs designed to assist patients with affording pharmaceuticals have become the subject of Congressional interest and enhanced government scrutiny. The HHS Office of Inspector General established guidelines permitting pharmaceutical manufacturers to make donations to charitable organizations that provide co-pay assistance to Medicare patients, provided that manufacturers meet certain specified compliance requirements. In the event we make such donations but are found not to have complied with these guidelines and other laws or regulations respecting the operation of these programs, we could be subject to significant decreasesdamages, fines, penalties or other criminal, civil or administrative sanctions or enforcement actions. We also rely on a third-party hub provider and exercise oversight to monitor patient assistance program activities. Hub providers are generally hired by manufacturers to assist patients with insurance coverage, financial assistance and treatment support after the patients receive a prescription from their healthcare professional. For manufacturers of specialty pharmaceuticals (including our marketed products), the ability to have a single point of contact for their therapies helps ensure efficient medication distribution to patients. Accordingly, our hub activities are also subject to scrutiny and may create risk for us if not conducted appropriately. A variety of entities, including independent charitable foundations and pharmaceutical manufacturers, but not including our company, have received subpoenas from the U.S. Department of Justice and other enforcement authorities seeking information related to their patient assistance programs and support. Should we or our hub providers receive a subpoena or other process, regardless of whether we are ultimately found to have complied with the regulations governing patient assistance programs, this type of government investigation could negatively impact our business practices, harm our reputation, divert the attention of management and increase our expenses.
We are subject to laws and regulations relating to privacy, data protection and the collection and processing of personal data. Failure to maintain compliance with these regulations could create additional liabilities for us.
The legislative and regulatory landscape for privacy and data protection continues to evolve in the overall salesU.S. and other jurisdictions around the world. For example, the CCPA went into operation in 2020 and affords California residents expanded privacy rights and protections, including civil penalties for violations and statutory damages under a private right of action for data security breaches. These protections will be expanded by the CPRA, which will be operational in most key respects on January 1, 2023. Similar legislative proposals have passed or pricesare being advanced in other states, and Congress is also considering additional federal privacy legislation. In addition, most healthcare professionals and facilities are subject to privacy and security requirements under HIPAA with respect to our clinical and commercial activities. Although we are not considered to be a covered entity or business associate under HIPAA, we could be subject to penalties if we use or disclose individually identifiable health information in a manner not authorized or permitted by HIPAA. Other countries also have, or are developing, laws governing the collection, use and transmission of personal information. For example, in the EU, the GDPR regulates the processing of personal data of individuals within the EU, even if, under certain circumstances, that processing occurs outside the EU, and also places restrictions on transfers of such data to countries outside of the EU, including the U.S. Should we fail to provide adequate privacy or data security protections or maintain compliance with these marketed productslaws and materially harmregulations, including the CCPA, CPRA and GDPR, we could be subject to sanctions or other penalties, litigation, an increase in our cost of doing business and financial condition.questions concerning the validity of our data processing activities, including clinical trials.
Risks Related to Growth of Our Product Portfolio and Research and Development
Clinical testing of cabozantinib for new indications, or of new potential product candidates, is a lengthy, costly, complex and uncertain process andthat may fail ultimately to demonstrate safety and efficacy.efficacy data for those products sufficiently differentiated to compete in our highly competitive market environment.
Clinical trials are inherently risky and may reveal that cabozantinib, despite its approval for certain indications, or a new potential product candidate, is ineffective or has an unacceptable safety profile with respect to an intended use. Such results may significantly decrease the likelihood of regulatory approval inof a particularproduct candidate or of an approved product for a new indication. Moreover, the results of preliminary studies do not necessarily predict clinical or commercial success, and later stagelate-stage or other potentially label-enabling clinical trials may fail to confirm the results observed in earlier stageearly-stage trials or preliminary studies. Although we have established timelines for manufacturing and clinical development of cabozantinib
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and our other product candidates based on existing knowledge of our compounds in development and industry metrics, we may not be able to meet those timelines.
We may experience numerous unforeseen events, during or as a result of clinical testing,investigations, that could delay or prevent commercialization of cabozantinib in new indications or of our othernew product candidates, including:and in some cases, as described in the risk factor titled, “If the COVID-19 pandemic is further prolonged or becomes more severe, our business operations and corresponding financial results could suffer, which could have a material adverse impact on our financial condition and prospects for growth,” the COVID-19 pandemic has already increased and may further increase the potential for such events to occur. These events may include:
lack of acceptable efficacy or a tolerable safety profile;
negative or inconclusive clinical trial results maythat require us to conduct further testing or to abandon projects that we had expected to be promising;projects;
discovery or commercialization by our competitors of other compounds or therapies that show significantly improved safety or efficacy compared to cabozantinib or our other product candidates;
our inability to identify and maintain a sufficient number of trial sites, many of which may already be engaged in other clinical trial programs;sites;
lower-than-anticipated patient registration or enrollment in our clinical testing, resultingtesting;
additional complexities posed by clinical trials evaluating cabozantinib or our other product candidates in combination with other therapies, including extended timelines to provide for collaboration on clinical development planning, the delay or cancellation of clinical testing;
failure by our collaboratorscollaboration partners to provide us on a timely basis with an adequate and timely supply of product that complies with the applicable quality and regulatory requirements for a combination trial;trial
reduced staffing or shortages in laboratory supplies and other resources necessary to complete the trials;
failure of our third-party contract research organizations or investigators to satisfy their contractual obligations, including deviating from any trial protocols; and
withholding of authorization from regulators or institutional review boards may withhold authorization to commence or conduct clinical trials of cabozantinib or another product candidate,delays, variations, suspensions or delay, suspend or terminateterminations of clinical research for various reasons, including noncompliance with regulatory requirements or theira determination by these regulators and institutional review boards that participating patients are being exposed to unacceptable health risks.
If we were to have significantthere are further delays in or termination of the clinical testing of cabozantinib or our other product candidates as a result ofdue to any of the events described above or otherwise, our expenses could increase and our ability to generate revenues could be impaired, either of which could adversely impact our financial results. Furthermore, we rely on our clinical and commercial collaboration partners to fund a significant portion of theour clinical development of cabozantinib and our product candidates.programs. Should one or all of our collaboration partners decline to support future planned clinical trials, we will be entirely responsible for the financial obligations associated withfinancing the further development of the cabozantinib franchise or our other product candidates and, as a result, we may be unable to execute our current business plans, which could have a material adverse impact on our business, financial condition and results of operations.

We may not be able to rapidly or effectively continuepursue the further development of the cabozantinib franchise or our other product candidates or meet current or future requirements of the FDA or regulatory authorities in other jurisdictions including those identified based onin accordance with our discussions with the FDAstated timelines or such other regulatory authorities.at all. Our planned clinical trials may not begin on time, or at all, may not be completed on schedule, or at all, may not be sufficient for registration of our product candidates or otherwise may not result in an approvable product.
The duration and the cost of clinical trials vary significantly as a result of factors relating to the clinical trial, including, among others:
the characteristics of the product candidate under investigation;
the number of patients who ultimately participate in the clinical trial;
the duration of patient follow-up that is appropriate in view of the results or required by regulatory authorities;
follow-up; the number of clinical sites included in the trials; and
the length of time required to enroll suitable patient subjects.eligible patients.
Any delay could limit our ability to generate revenues, cause us to incur additional expense and cause the market price of our common stock to decline significantly. Our partners under our collaboration agreements may experience similar risks with respect to the compounds we have out-licensed to them. If any of the events described above were to occur with such programs or compounds, the likelihood of receipt of milestones and royalties under such collaboration agreements could decrease.



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The regulatory approval processes of the FDA and comparable foreign regulatory authorities are lengthy, uncertain and uncertain,subject to change, and may not result in regulatory approvals for additional cabozantinib indications or for our other product candidates, which could have a material adverse impact on our business, financial condition and results of operations.
The activities associated with the research, development and commercialization of the cabozantinib franchise and our other product candidates are subject to extensive regulation by the FDA and other regulatory agencies in the U.S. and, as well as by comparable regulatory authorities in other countries.territories. The processprocesses of obtaining regulatory approvals in the U.S. and other foreign jurisdictions is expensive and often takes many years, if approval is obtained at all, and they can vary substantially based upon the type, complexity and novelty of the product candidates involved. For example, before an NDA or sNDA can be submitted to the FDA, or a MAAmarketing authorization application to the EMA or any application or submission to comparable regulatory authorities in other jurisdictions, the product candidate must undergo extensive clinical trials, which can take many years and require substantial expenditures.
Any clinical trial may fail to produce results satisfactory to the FDA or regulatory authorities in other jurisdictions. For example, the FDA could determine that the design of a clinical trial is inadequate to produce reliable results. The regulatory process also requires preclinical testing, and data obtained from preclinical and clinical activities are susceptible to varying interpretations. The FDA has substantial discretion in the approval process and may refuse to approve any NDA or sNDA or decide that our data is insufficient for approval and require additional preclinical, clinical or other studies. For example, varying interpretations of the data obtained from preclinical and clinical testing could delay, limit or prevent regulatory approval of cabozantinib for any individual, additional indications.
In addition, we may encounter delays or rejections may be encountered based upon changes in regulatory policy, for product approval during the period of product development and regulatory agency review, which maycould cause delays in the approval or rejection of an application for cabozantinib or for our other product candidates. For example, the FDA launched Project Optimus in 2021 as an initiative to reform the dose optimization and dose selection paradigm in oncology drug development, which was driven by the FDA’s concerns that the current paradigm for dose selection may result in doses and schedules of molecularly targeted therapies that are inadequately characterized before initiating pivotal trials. Through collaboration with the biopharmaceutical industry, academia and other stakeholders, the FDA’s goal for this initiative is to advance an oncology dose-finding and dose optimization paradigm that emphasizes dose selections that maximize efficacy as well as safety and tolerability. In support of this initiative, FDA may request sponsors of oncology product candidates to conduct dose optimization studies pre- or post-approval. Recently, in part due to questions raised by the process underlying the approval of the Alzheimer’s disease drug Aduhelm®,government authorities and other stakeholders have been scrutinizing the accelerated approval pathway, with some stakeholders advocating for reforms. Even prior to the Aduhelm approval, FDA has held Oncologic Drugs Advisory Committee meetings to discuss accelerated approvals for which confirmatory trials have not verified clinical benefit. Such scrutiny, among other factors, has resulted in voluntary withdrawals of certain products and indications approved on an accelerated basis. Moreover, spurred by the Aduhelm controversy, the HHS Office of Inspector General has initiated an assessment of how the FDA implements the accelerated approval pathway. At this time, it is not clear what impact, if any, these developments may have on the statutory accelerated approval pathway or our business, financial condition and results of operations.
Even if the FDA or a comparable authority in another jurisdiction approves cabozantinib for one or more new indications, beyond advanced RCC, previously treated HCC and MTC, or one of our other product candidates, thesuch approval may be limited, imposing significant restrictions on the indicated uses, conditions for use, labeling, distribution, advertising, promotion, marketing and/or production of the product and could impose ongoing requirements for post-approvalpost-marketing studies, including additional research and developmentclinical trials, all of which may result in significant expense and clinical trials. For example,limit our and our collaboration partners’ ability to commercialize cabozantinib in one or more new indications. Failure to complete post-marketing requirements of the FDA in connection with the FDA’sa specific approval of COMETRIQ for the treatment of progressive, metastatic MTC, we are subject to a post-marketing requirement to conduct a clinical study comparing a lower dose of cabozantinib to the approved dose of 140 mg daily cabozantinib in progressive, metastatic MTC. Failure to complete any post-marketing requirements in accordance with the timelines and conditions set forth by the FDA could significantly increase costs or delay, limit or eliminateultimately restrict the commercialization of cabozantinib. Further, thesecabozantinib in that indication. Regulatory agencies maycould also impose various administrative, civil or criminal sanctions for failure to comply with regulatory requirements, including withdrawal of product approval.

operations.
We may be unable to expand our discovery and development pipeline, which could limit our growth and revenue potential.
Our business is focused on the discovery, development and commercialization of new medicines for difficult-to-treat cancers. In this regard, we are pursuing internalhave invested in substantial technical, financial and human resources toward drug discovery effortsactivities with the goal of identifying new product candidates to advance into clinical trials. Internal discovery efforts to identify new product candidates require substantial technical, financial and human resources. These internal discovery efforts mayNotwithstanding this investment, many programs that initially show promise in identifying potential product candidates, yetwill ultimately fail to yield product candidates for clinical development for a number ofmultiple reasons. For example, potential product candidates may, on further study, be shown to have inadequate efficacy, harmful side effects, suboptimal pharmaceutical profiles or other characteristics suggesting that they are unlikely to be commercially viable products.
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Apart from our internaldrug discovery efforts, our strategy to expand our development pipeline is also dependent on our ability to successfully identify and acquire or in-license relevant product candidates.candidates and technologies. However, the in-licensing and acquisition of product candidates and technologies is a highly competitive area, and many other companies are pursuing the same or similar product candidates and technologies to those that we may consider attractive. In particular, larger companies with more well-established and diverse revenue streams may have a competitive advantage over us due to their size, financialcapital resources and more extensive clinical development and commercialization capabilities.capabilities may have a competitive advantage over us. Furthermore, companies that perceive us to be a competitor may be unwilling to assign or license rights to us. We may also be unable to in-license or acquire additional relevant product candidates and technologies on acceptable terms that would allow us to realize an appropriate return on our investment. If we are unable to develop suitable product candidates through internal discovery effort or if we are unable to successfully obtain rights to suitable product candidates, our business, financial condition and prospects for growth could suffer. Even if we succeed in our efforts to obtain rights to suitable product candidates and technologies, the competitive business environment may result in higher acquisition or licensing costs, and our investment in these potential products and technologies will remain subject to the inherent risks associated with the development and commercialization of new medicines. In certain circumstances, we may also be reliant on the licensor for the continued development of the in-licensed technology and their efforts to safeguard their underlying intellectual property.
With respect to acquisitions, we may not be able to integrate the target company successfully into our existing business, maintain the key business relationships of the target company, or retain key personnel of anthe acquired business. Furthermore, we could assume unknown or contingent liabilities or otherwise incur unanticipated expenses. Any acquisitions or investments made by us also could result in our spending significant amounts, issuing dilutive securities, assuming or incurring significant debt obligations and contingent liabilities, incurring large one-time expenses and acquiring intangible assets that could result in significant future amortization expense and significant write-offs, any of which could harm our operating results.
Increasing use of social media could give rise to liability and result in harm to our business.
We and our employees are increasingly utilizing social media tools and our website as a means of communication. For example, we use Facebook and Twitter to communicate with the medical community and the investing public, although we do not intend to disclose material, nonpublic information through these means. Despite our efforts to monitor evolving social media communication guidelines and comply with applicable rules, there is risk that the unauthorized use of social media by us or our employees to communicate about our products or business, or inadvertent disclosure of material, nonpublic information through these means, may cause us to be found in violation of applicable laws and regulations, which may give rise to liability and result in harm to our business. In addition, there is also risk of inappropriate disclosure of sensitive information, which could result in significant legal and financial exposure and reputational damages that could potentially have a materially adverse impact on our business, financial condition and results of operations. Furthermore, negative posts or comments about us orIf our productsdrug discovery efforts, including research collaborations, in-licensing arrangements and other business development activities, do not result in social mediasuitable product candidates, our business and prospects for growth could seriously damage our reputation, brand image and goodwill.suffer.
Risks Related to OurFinancial Matters and Capital Requirements Accounting
Our profitability could be negatively impacted if expenses associated with our extensive clinical development, business development and Financial Results
We may be unable to maintain or increase profitability.commercialization activities, both for the cabozantinib franchise and our earlier-stage product candidates, grow more quickly than the revenues we generate.
Although we reported net income of $690.1$231.1 million and $111.8 million for the yearyears ended December 31, 20182021 and 2020, respectively, we may not be able to maintain or increase profitability on a quarterly or annual basis, and we are unable to predict the extent of long-range future profits or losses. The amount of our net profits or losses will depend, in part, on: the level of sales of CABOMETYX and COMETRIQ in the U.S.; our achievement of clinical,development, regulatory and commercial milestones, if any, under our collaboration agreements with Ipsen and Takeda;agreements; the amount of royalties from sales of CABOMETYX and COMETRIQ outside of the U.S. under our collaboration agreements with Ipsen and Takeda;agreements; other collaboration revenues; and the level of our expenses,

including those associated with our extensive drug discovery, clinical development and commercializationbusiness development activities, both for the cabozantinib franchise and any pipelineour earlier-stage product candidates, as well as our general business expansion efforts.plans. Our expected future expenses in particular may also be increased by inflationary pressures, whether resulting from the effects of the COVID-19 pandemic or otherwise, which could increase the costs of outside services, labor, raw materials and finished drug product. We expect to continue to spend significant additionalsubstantial amounts to fund the continued development of the cabozantinib franchise for additional indications and the commercialization of our approved products. In addition, we willintend to continue to expand our oncology product pipeline through our drug discovery efforts, including research collaborations, in-licensing arrangements and the execution ofother strategic transactions that align with our oncology drug development, regulatory and commercial expertise, which efforts could involve substantial costs. To offset these costs in the future, we will need to generate substantial revenues. If these costs exceed our current expectations, or we fail to achieve anticipated revenue targets, the market value of our common stock may decline.
If additional capital is not available to us when we need it, we may be forcedunable to limit the expansion ofexpand our product development programs or commercialization efforts.
As of December 31, 2018, we had $851.6 million in cashofferings and investments, which included $850.5 million available for operations. Our business operations continued to grow substantially during 2018. In order to maintain business growth and maximize the clinical and commercial opportunities for cabozantinib, we plan to continue to execute on the U.S. commercialization plans for CABOMETYX, while reinvesting in our product pipeline through the continued development of cabozantinib, both alone and in combination with other therapies, research and development activities, as well as through strategic transactions. Our ability to execute on these business objectives will depend on many factors including but not limited to:
the commercial success of both CABOMETYX and COMETRIQ and the revenues we generate from those approved products;
costs associated with maintaining our expanded sales, marketing, market access, medical affairs and product distribution capabilities for CABOMETYX and COMETRIQ;
the achievement of stated regulatory and commercial milestones and royalties paid under our collaboration agreements with Ipsen and Takeda;
the commercial success of and revenues generated by products marketed under our collaboration and license agreements;
future clinical trial results;
the level of our investments in the expansion of our pipeline through drug discovery and corporate development activities;
our ability to control costs;
the number and size of clinical trials we conduct and the cost of drug supply for such clinical trials evaluating our products with other therapeutic agents;
trends and developments in the pricing of oncologic therapeutics in the U.S. and abroad, especially in the EU;
scientific developments in the market for oncologic therapeutics and the timing of regulatory approvals for competing oncologic therapies; and
the filing, maintenance, prosecution, defense and enforcement of patent claims and other intellectual property rights.growth.
Our commitment of cash resources to CABOMETYX and the reinvestment in our product pipeline through the continued development of the cabozantinib franchise and our earlier-stage product candidates, and increasing drug discovery activities, as well as through the execution of strategicbusiness development transactions, could require us to obtain additional capital. We may seek such additional capital through some or all of the following methods: corporate collaborations; licensing arrangements; and public or private debt or equity financings. Our ability to obtain additional capital may depend on prevailing economic conditions and financial, business and other factors beyond our control. Disruptions in the U.S. and global financial markets, including any disruptions resulting from government shutdowns, the UK’s pending withdrawal from the EU, rising interest rate environments, increased or changed tariffs and trade restrictions or otherwise, may adversely impact the availability and cost of credit, as well as our ability to raise money in the capital markets. Economic and capital markets conditions have been, and continue to be, volatile. Continued instability in these market conditions may limit our ability to access the capital necessary to fund and grow our business.  Accordingly, weWe do not know whether additional capital will be available when needed, or that, if available, we will obtain additional capital on
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terms favorable to us or our stockholders. If we are unable to raise additional funds when we need them, we may be requiredunable to limit the expansion ofexpand our product development programs or commercialization efforts,offerings and maintain business growth, which could have a material adverse impact on our business, financial condition and results of operations.

Our financial results are impacted by management’s selection of accounting methods, certain assumptions and estimates and future changes in accounting standards.
Our accounting policies and methods are fundamental to how we record and report our financial condition and results of operations. Our management must exercise judgment in selecting and applying many of these accounting policies and methods so they comply with generally accepted accounting principles and reflect management’s judgment of the most appropriate manner to report our financial condition and results of operations. In some cases, management must select the accounting policy or method to apply from two or more alternatives, any of which may be reasonable under the circumstances, yet may result in our reporting materially different results than would have been reported under a different alternative.
Certain accounting policies are critical to the presentation of our financial condition and results of operations. The preparation of our financial statements requires us to make significant estimates, assumptions and judgments that affect the amounts of assets, liabilities, revenues and expenses and related disclosures. We believe our critical accounting policies relating to revenue recognition, clinical trial accruals, inventory and stock-based compensation reflect the more significant estimates and judgments used in the preparation of our Consolidated Financial Statements. Although we base our estimates and judgments on historical experience, our interpretation of existing accounting literature and on various other assumptions that we believe to be reasonable under the circumstances, if our assumptions prove to be materially incorrect, actual results may differ materially from these estimates.
In addition, future changes in financial accounting standards may cause adverse, unexpected revenue fluctuations and affect our financial position or results of operations, particularly those relating to the way we account for revenues and costs. New pronouncements from the Financial Accounting Standards Board (FASB) and varying interpretations of pronouncements have occurred with frequency in the past and are expected to occur again in the future and as a result, we may be required to make changes in our accounting policies. Those changes could adversely affect our reported revenues and expenses, our other results of operations or our current financial position.
The recently passed comprehensive tax reform bill could have a material adverse impact on our business, financial condition and results of operations.
The Tax Cuts and Jobs Act could be amended or subject to technical correction, which could change the financial impacts that were recorded at December 31, 2017 and December 31, 2018, or are expected to be recorded in future periods. Additionally, further guidance may be forthcoming from the FASB and SEC, as well as regulations, interpretations and rulings from federal and state tax agencies, which could result in additional impacts, possibly with retroactive effect.
Our effective tax rate may fluctuate, and we may incur obligations in tax jurisdictions in excess of accrued amounts.
We are subject to income tax in the U.S. as well as numerous U.S. states and territories, municipalities, and other local jurisdictions. As a result, our effective tax rate is derived from various factors including the mix of earnings and applicable tax rates in the various places that we operate, the accounting for stock options and share based awards, and research and development spending. In preparing our financial statements, we estimate the amount of tax that will become payable in each jurisdiction. Our effective tax rate, however, may be different than experienced in the past due to numerous factors, including changes in tax laws such as the passage of the Tax Cuts and Jobs Act, changes in the mix of our earnings from state to state, the results of examinations and audits of our tax filings, or our inability to secure or sustain acceptable agreements with tax authorities. Any of these factors could cause our effective tax rate to fluctuate.
Our ability to use net operating losses and tax credits to offset future taxable income may be subject to limitations.
As of December 31, 2018, we had federal and state net operating loss carryforwards of approximately $1.1 billion. The federal and state net operating loss carryforwards will begin to expire, if not utilized, beginning in 2028 for federal income tax purposes and 2028 for California state income tax purposes. These net operating loss carryforwards could expire unused and be unavailable to offset future income tax liabilities. Under the Internal Revenue Code (the Code) and similar state provisions, certain substantial changes in our ownership could result in an annual limitation on the amount of net operating loss carryforwards that can be utilized in future years to offset future taxable income. The annual limitation may result in the expiration of net operating losses and credit carryforwards before utilization. Based on our review and analysis, we concluded, as of December 31, 2018, that an ownership change, as defined under Section 382, had not occurred. However, if there is an ownership change under Section 382 of the Code in the future, we may not be able to utilize a

material portion of our net operating losses. Furthermore, our ability to utilize our net operating losses is conditioned upon our maintaining profitability and generating U.S. federal taxable income.
The transition away from the London Interbank Offered Rate (LIBOR) could affect the value of certain short-term investments, as well as our ability to seek additional debt financing.
Actions by governmental entities may impact certain financial instruments in which we have invested or may invest in the future. For example, some of these financial instruments may rely in some fashion upon LIBOR, which is an average interest rate, determined by the ICE Benchmark Administration, that banks charge one another for the use of short-term money. The UK's Financial Conduct Authority, which regulates LIBOR, has announced plans to phase out the use of LIBOR by the end of 2021. While only a small percentage of our short-term investments include financial instruments subject to LIBOR, and while we do not currently have any outstanding debt that is subject to LIBOR, there remains uncertainty regarding the future utilization of LIBOR and the nature of any replacement rate, and any potential effects of the transition away from LIBOR on certain instruments in to which we may enter in the future are not known. The transition process may involve, among other things, increased volatility or illiquidity in markets for instruments that currently rely on LIBOR. The transition may also result in reductions in the value of certain instruments or the effectiveness of related transactions such as hedges, increased borrowing costs, uncertainty under applicable documentation, or difficult and costly consent processes.  Any such effects of the transition away from LIBOR, as well as other unforeseen effects, result in expenses, difficulties, complications or delays in connection with future financing efforts, which could have a material adverse impact on our business, financial condition and results of operations.
The UK’s pending withdrawal from the EU may have a negative effect on global economic conditions, financial markets and our business.
Brexit has created significant uncertainty concerning the future relationship between the UK and the EU. While discussions between the UK and the EU focused on finalizing withdrawal issues and transition agreements are ongoing, limited progress to date in these negotiations and ongoing uncertainty within the UK government and parliament sustains the possibility of the UK leaving the EU on March 29, 2019 without a withdrawal agreement and associated transition period in place, which is likely to cause significant market and economic disruption. The effects of Brexit will depend on any agreements the UK makes to retain access to EU markets either during a transitional period or more permanently. Brexit could, among other outcomes, disrupt the free movement of goods, services and people between the UK and the EU, undermine bilateral cooperation in key policy areas and significantly disrupt trade between the UK and the EU. In addition, Brexit could lead to legal uncertainty and potentially divergent national laws and regulations as the UK determines which EU laws to replace or adopt.
Given the lack of comparable precedent, it is unclear what financial, trade, regulatory and legal implications the withdrawal of the UK from the EU would have and how such withdrawal would affect us. For example, we rely on third-party contract manufacturing organization facilities located in the UK, which are responsible for packaging, labeling, storing and subsequently distributing supplies of our product to the EU, and any tariffs, differing regulatory requirements and other restrictions on the free movement of goods between the UK and the EU that result from Brexit may have an adverse impact on this part of our supply chain. In addition, trade restrictions, changes to the regulatory approval or drug cost reimbursement systems, and additional administrative costs may impede the ability of our collaborator Ipsen to market our products in Europe. Furthermore, the announcement of Brexit caused significant volatility in global stock markets and currency exchange rate fluctuations, and the pending withdrawal of the UK from the EU may also adversely affect European and global economic and market conditions, which may cause third-party payers, including governmental organizations, to closely monitor their costs and reduce their spending budgets, and which could contribute to instability in the global financial and foreign exchange markets. Any of these effects of Brexit, among others, could have a material adverse impact on our business, financial condition and results of operations.

Risks Related to Our Relationships with Third Parties
We rely on Ipsen and Takeda for the commercial success of CABOMETYX in its approved indications outside of the U.S., and we are dependentunable to control the amount or timing of resources expended by these collaboration partners in the commercialization of CABOMETYX in its approved indications outside of the U.S.
We rely upon the regulatory, commercial, medical affairs, market access and other expertise and resources of our collaboration partners, Ipsen and Takeda, for commercialization of CABOMETYX in their respective territories outside of the U.S. We cannot control the amount and timing of resources that our collaboration partners dedicate to the commercialization of CABOMETYX, or to its marketing and distribution, and our ability to generate revenues from the commercialization of CABOMETYX by our collaboration partners depends on their ability to obtain and maintain regulatory approvals for, achieve market acceptance of, and to otherwise effectively market, CABOMETYX in its approved indications in their respective territories. Further, the operations of our collaboration partners, and ultimately their sales of CABOMETYX in their respective territories outside of the U.S., could be adversely affected by the degree and effectiveness of their respective corporate responses to the COVID-19 pandemic, as well as by the imposition of governmental price or other controls, political and economic instability, trade restrictions or barriers and changes in tariffs, escalating global trade and political tensions, or other factors. If our collaboration partners are unable or unwilling to invest the resources necessary to commercialize CABOMETYX successfully in the EU, Japan and other international territories where it has been approved, this could reduce the amount of revenue we are due to receive under these collaboration agreements, thus resulting in harm to our business and operations.
Our clinical, regulatory and commercial collaborations with major companies make us reliant on those companies for their continued performance and investments, which subjectsubjects us to a number of risks.
We have established clinical and commercial collaborations with leading pharmaceutical and biotechnologybiopharmaceutical companies including, Ipsen, Takeda, Genentech, Daiichi Sankyo and BMS for the development and ultimate commercialization of certain compounds generated from our research and development efforts. Our dependence on our relationships with collaborators for the development and commercialization of compoundsour products, and our dependence on these collaboration partners subjects us to a number of risks, including:including, but not limited to:
our collaboration partners’ decision to terminate our collaboration, or their failure to comply with the terms of our collaboration agreements and related ancillary agreements, either intentionally or as a result of negligence or other insufficient performance;
our inability to control the amount and timing of resources that our collaborators or potential future collaborators willcollaboration partners devote to the development or commercialization of drug candidates or to their marketing and distribution;our products;
the possibility that collaboratorsour collaboration partners may stop or delay clinical trials, fail to supply us on a timely basis with the product required for a combination trial, or deliver product that fails to meet appropriate quality and regulatory standards and results in a market recall or withdrawal, provide insufficient funding for a clinical trial program, stop a clinical trial or abandon a drug candidate, repeat or conduct new clinical trials or require a new formulation of a drug candidate for clinical testing;standards;
disputes that may arise between us and our collaboratorscollaboration partners that result in the delay or termination of the research, development or commercialization of our drug candidates, or that diminish or delay receipt of the economic benefits we are entitled to receive under the collaboration, or that result in costly litigation or arbitration that diverts management’s attention and resources;arbitration;
our inability to control the U.S. commercial resourcing decisions made and resulting costs incurred by Genentech for COTELLIC, which costs we are obligated to share, in part, under our collaboration agreement with Genentech;
the possibility that our collaboratorscollaboration partners may experience financial difficulties;difficulties that prevent them from fulfilling their obligations under our agreements;
our collaborators’ lack of success in their effortscollaboration partners’ inability to obtain regulatory approvals in a timely manner, or at all;
our collaborators’collaboration partners’ failure to comply with legal and regulatory requirements relevant to the authorization, marketing, distribution and supply of our marketed products in the territories outside the U.S. where they are approved; and
our collaboration partners’ failure to properly maintain or defend our intellectual property rights or their use of our intellectual property rights or proprietary information in such a way as to invite litigation that could jeopardize or invalidate our intellectual property rights or expose us to potential litigation;
our collaborators’ failure to comply with the terms of our collaboration agreements and related ancillary agreements;
our collaborators’ failure to comply with applicable healthcare laws, as well as established guidelines, laws and regulations related to GMP, GCP, GDP and Good Pharmacovigilance Practices;
business combinations or significant changes in a collaborator’s business strategy may adversely affect a collaborator’s willingness or ability to complete its obligations under any arrangement;
the possibility that our collaborators could independently move forward with competing drug candidates developed either independently or in collaboration with others, including our competitors;
our inability to enter into additional collaboration arrangements with other parties in an area or field of exclusivity;
the possibility that future collaborators may require us to relinquish some important rights, such as marketing and distribution rights; and
the possibility that collaborations may be terminated or allowed to expire, which would delay, and may increase the cost of development of our drug candidates.litigation.
If any of these risks materialize, we may not receive collaboration revenues or otherwise realize anticipated benefits from such collaborations, and our product development efforts and prospects for growth could be delayed or disrupted, all of which could have a material adverse impact on our business, financial condition and results of operations.
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Our growth potential is dependent in part upon companies with which we have entered into research collaborations, in-licensing arrangements and similar business development relationships.
To expand our early-stage product pipeline, we have augmented our drug discovery activities with multiple research collaborations and in-licensing arrangements with other companies. Our dependence on our relationships with these research and in-licensing partners subjects us to numerous risks, including, but not limited to:
our research and in-licensing partners’ decision to terminate our relationship, or their failure to comply with the terms of our agreements, either intentionally or as a result of negligent performance;
disputes that may arise between us and our research and in-licensing partners that result in the delay or termination of research activities with respect to any in-licensed assets or supporting technology platforms;
the possibility that our research and in-licensing partners may experience financial difficulties that prevent them from fulfilling their obligations under our agreements;
our research and in-licensing partners’ failure to properly maintain or defend their intellectual property rights or their use of third-party intellectual property rights or proprietary information in such a way as to invite litigation that could jeopardize or invalidate our license to develop these assets or utilize technology platforms;
laws, regulations or practices imposed by countries outside the U.S. that could impact or inhibit scientific research or the development of healthcare products by foreign competitors or otherwise disadvantage healthcare products made by foreign competitors, as well as general political or economic instability in those countries, any of which could complicate, interfere with or impede our relationships with our ex-U.S. research, development and in-licensing partners; and
our research and in-licensing partners’ failure to comply with applicable healthcare laws, as well as established guidelines, laws and regulations related to GMP and GLP.
If any of these risks materialize, we may not be able to expand our product pipeline or otherwise realize a return on the resources we will have invested to develop these early-stage assets, which could have a material adverse impact on our financial condition and prospects for growth.
If third parties upon which we rely to perform clinical trials for cabozantinib in new indications or for new potential product candidates do not perform as contractually required or expected, we may not be able to obtain regulatory approval for or commercialize cabozantinib or other product candidates beyond currently approved indications.
We do not have the ability to conduct clinical trials for cabozantinib or for new potential product candidates independently, including our post-marketing commitments in connection with the approval of COMETRIQ in progressive,

metastatic MTC, so we rely on independent third parties for the performance of these trials, such as the U.S. federal government, (including NCI-CTEP, a department of the National Institutes of Health, with whom we have our CRADA), third-party contract research organizations, medical institutions, clinical investigators and contract laboratories to conduct our clinical trials. If these third parties do not successfully carry out their contractual duties or regulatory obligations or meet expected deadlines, or if the third parties must be replaced or if the quality or accuracy of the data they generate or provide is compromised due to their failure to adhere to our clinical trial or data security protocols or regulatory requirements or for other reasons, our preclinical development activities or clinical trials may be extended, delayed, suspended or terminated, and we may not be able to obtain regulatory approval for or commercialize cabozantinib or other product candidates beyond currently approved indications.indications or obtain regulatory approval for our other product candidates. In addition, due to the complexity of our research initiatives, we may be unable to engage with third-party contract research organizations that have the necessary experience and sophistication to furtherhelp advance our drug discovery efforts, which would impede our ability to identify, develop and commercialize our potential product candidates.
We lack internalour own manufacturing and distribution capabilities necessary for us to produce materials required for certain preclinical activities and to produce and distribute our products for clinical development or for commercial sale, and relyour reliance on third parties to do so, whichfor these services subjects us to various risks.
We do not own or operate manufacturing facilities,or distribution facilities or resources for CMC development activities, preclinical, clinical or commercial production and distribution offor our products.current products and new product candidates. Instead, we have multiple contractual agreements in place withrely on various third-party contract manufacturing organizations that,to conduct these operations on our behalf, manufacture clinical and commercial supplies of CABOMETYX and COMETRIQ.behalf. As our operations continue to grow in these areas, we continue to expand due to our development and commercial progress, we expect to enter into new agreements with additionalsupply chain through secondary third-party contract manufacturers, distributors and suppliers as needed. This will continue for the foreseeable future for all of our product candidates and all of our current and future commercial products.
suppliers. To establish and manage our supply chain requires a significant financial commitment, the creation of numerous third-party contractual relationships and continued oversight of these third parties to ensurefulfill compliance with applicable regulatory requirements. Although we maintain significant resources to directly and effectively oversee the activities and relationships with the companies in our supply chain, we do not have direct control over their operations.
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Our third-party contract manufacturers may not be able to produce material on a timely basis or manufacture material with the required quality standards, or in the quantity required to meet our preclinical, clinical development and commercial needs and applicable regulatory requirements.requirements, including as a result of the COVID-19 pandemic. Although we have not yet experienced significant production delays or seen significant impairment to our supply chain as a result of the COVID-19 pandemic, our third-party contract manufacturers, distributors and suppliers could experience operational delays due to facility closures and other hardships as a result of the COVID-19 pandemic or otherwise, which could impact our supply chain by potentially causing delays to or disruptions in the supply of our commercial or clinical products or product candidates. If our third-party contract manufacturers, distributors and suppliers do not continue to supply us with our products or product candidates in a timely fashion and in compliance with applicable quality and regulatory requirements, or if they otherwise fail or refuse to comply with their obligations to us under our supplymanufacturing, distribution and manufacturingsupply arrangements, we may not have adequate remedies for any breach. Furthermore, their failure to supply us could impair or preclude our ability to meet ourmeeting commercial or clinical product supply requirements or our supply needs for clinical trials, including those being conducted in collaboration withus or our partners, which could delay our product development and future commercialization efforts and have a material adverse impact on our business, financial condition and results of operations. ThroughIn addition, through our third-party contract manufacturers and data service providers, we have implemented product serialization designedcontinue to provide serialized commercial products as required to comply with the DSCSA, pursuant to which all prescription pharmaceutical products manufactured and distributed in the U.S. were required to be serialized as of November 27, 2018.DSCSA. If our third-party contract manufacturers or data service providers fail to support our efforts to continue to comply with DSCSA and any future federal or state electronic pedigree requirements, we may face legal penalties or be restricted from selling our products.
As part of our collaboration agreements with Ipsen and Takeda, we are responsible for the supply of CABOMETYX and COMETRIQ for global development and commercial purposes. Failure to meet our supply obligations under these collaboration agreements could impair our collaborators’ ability to successfully develop and commercialize CABOMETYX and COMETRIQ and generate revenues to which we are entitled under the collaborations.
Our collaborations with outsideIf third-party scientific advisors and collaboratorscontractors we rely on to assist with our drug discovery efforts do not perform as expected, the expansion of our product pipeline may be subject to restriction and change.delayed.
We work with scientific and clinical advisors and collaborators at academic and other institutions, as well as third-party contractors in various locations throughout the world, that assist us in our research and development efforts, including in drug discovery and preclinical development strategy. These advisors and collaboratorsthird parties are not our employees and may have other commitments or pursue other opportunitiescontractual obligations that limit their availability to us. Although these third-party scientific advisors and collaboratorscontractors generally agree not to do competing work, if a conflict of interest between their work for us and their work for another entity arises, we may lose their services. There has also been increased scrutiny surrounding the disclosures of payments made to medical researchers from companies in the pharmaceutical industry, and it is possible that the academic and other institutions that employ these medical researchers may prevent us from engaging them as scientific advisors and collaboratorscontractors or otherwise limit our access to these experts, or that the scientific advisors themselves may now be more reluctant to work with industry partners. In anyEven if these scientific advisors and contractors with whom we have engaged intend to meet their contractual obligations, their ability to perform services may be impacted by increased demand for such services from other companies or by other external factors, such as reduced capacity to perform services, as we experienced in the early stages of these circumstances,the COVID-19 pandemic. If we mayexperience additional delays in the receipt of services, lose

work performed by these scientific advisors and collaboratorscontractors or beare unable to engage them in the first place, and our discovery and development efforts with respect to the matters on which they were working or would work in the future may be significantly delayed or otherwise adversely affected. In addition, although our advisors and collaborators sign agreements not to disclose our confidential information, it is possible that valuable proprietary knowledge may become publicly known through them.
Risks Related to Our Information Technology Data Privacy and Intellectual Property
Data breaches, cyber-attacks and other failures in our information technology operations and infrastructure could compromise our intellectual property or other sensitive information, damage our operations and cause significant harm to our business and reputation.
In the ordinary course of our business, we and our third-party service providers, such as contract research organizations, collect, maintain and transmit sensitive data on our networks and systems, including our intellectual property and proprietary or confidential business information (such as research data and personal information) and confidential information with respect to our customers, clinical trial patients and our businesscollaboration partners. We have also outsourced significant elements of our information technology infrastructure to third parties and, as a result, such third parties may or could have access to our confidential information. The secure maintenance of this information is critical to our business and reputation, and while we have enhanced and are continuing to enhance our cyber-securitycybersecurity efforts commensurate with the growth and complexity of our business, our systems and those of third-party service providers may be vulnerable to a cyber-attack. In addition, we are heavily dependent on the functioning of our information technology infrastructure to carry out our business processes, such as external and internal communications or access to clinical data and other key business information. Accordingly, both inadvertent disruptions to this infrastructure and cyber-attacks could cause us to incur significant remediation or litigation costs, result in product development delays, disrupt keycritical business operations, and divert attention of management andexpend key information technology resources.resources and divert the attention of management.
We believe that companies have been increasingly subject to a wide variety
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Although the aggregate impact of cyber-attacks on our operations and financial condition has not been material to date, we and our third-party service providers have frequently been the target of threats of this nature and expect them to continue. These threats can come from a variety of sources, ranging in sophistication from an individual hacker to a state-sponsored attack and motive (including corporate espionage). Cyber threats may be generic, or they may be custom-crafted against our information systems. Cyber-attacks continue to become more prevalent and much harder to detect and defend against. Our network and storage applications and those of our contract manufacturing organizations, contract research organizations or vendors may be subject to unauthorized access by hackers or breached due to operator error, malfeasance or other system disruptions. It is often difficult to anticipate or immediately detect such incidents and the damage caused by such incidents. TheseAny future data breaches and anybreach and/or unauthorized access or disclosure of our information or intellectual property could compromise our intellectual property and expose our sensitive business information (oror sensitive business information of our collaboration partners, which may lead to significant liability for us).us. A data security breach could also lead to public exposure of personal information of our clinical trial patients, employees or others and others. Any such event that leadsresult in harm to unauthorized access, use or disclosure of personal information, including personal information regarding our patients or employees, could harm our reputation and business, compel us to comply with federal and/or state breach notification laws and foreign law equivalents (includingincluding the GDPR),GDPR, subject us to investigations and mandatory corrective action, andor otherwise subject us to liability under laws and regulations that protect the privacy and security of personal information, which could disrupt our business, result in increased costs or loss of revenue, and/or result in significant financial exposure. Furthermore, the costs of maintaining or upgrading our cyber-securitycybersecurity systems (including the recruitment and retention of experienced information technology professionals, who are in high demand) at the level necessary to keep up with our expanding operations and prevent against potential attacks are increasing, and despite our best efforts, our network security and data recovery measures and those of our vendorsthird-party service providers may still not be adequate to protect against such security breaches and disruptions, which could cause material harm to our business, financial condition and results of operations.
If we are unable to adequately protect our intellectual property, third parties may be able to use our technology, which could adversely affect our ability to compete in the market.
Our success will depend in part upon our ability to obtain patents and maintain adequate protection of the intellectual property related to our technologies and products. The patent positions of biopharmaceutical companies, including our patent position, are generally uncertain and involve complex legal and factual questions. We will be able to protect our intellectual property rights from unauthorized use by third parties only to the extent that our technologies are covered by valid and enforceable patents or are effectively maintained as trade secrets. We will continue to apply for patents covering our technologies and products as, where and when we deem lawful and appropriate. However, these

applications may be challenged or may fail to result in issued patents. Our issued patents have been and may in the future be challenged by third parties as invalid or unenforceable under U.S. or foreign laws, or they may be infringed by third parties, and we are from time to time involved in the defense and enforcement of our patents or other intellectual property rights in a court of law, U.S. Patent and Trademark Office inter partes review or reexamination proceeding, foreign opposition proceeding or related legal and administrative proceeding in the U.S. and elsewhere. The costs of defending our patents or enforcing our proprietary rights in post-issuance administrative proceedings and litigation can be substantial and the outcome can be uncertain. An adverse outcome may allow third parties to use our intellectual property without a license and/or allow third parties to introduce generic and other competing products, any of which would negatively impact our business. Third parties may also attempt to invalidate or design around our patents, or assert that they are invalid or otherwise unenforceable, and seek to introduce generic versions of cabozantinib. In addition, shouldFor example, we received Paragraph IV certification notice letters from MSN and Teva concerning the respective ANDAs that each had filed with the FDA seeking approval to market their respective generic versions of CABOMETYX tablets. Should MSN, Teva or any other third parties receive FDA approval of an ANDA foror a generic version of cabozantinib or an 505(b)(2) NDA with respect to cabozantinib, and if our patents covering cabozantinib were held to be invalid (or ifit is possible that such competing generic versions of cabozantinib were found to not infringe our patents), then theycompany or companies could introduce generic versions of cabozantinib or other such 505(b)(2)our marketed products before our patents expire if they do not infringe our patents or if it is determined that our patents are invalid or unenforceable, and the resulting generic competition would negatively affectcould have a material adverse impact on our business, financial condition and results of operations.
In addition, because patent applications can take many years to issue, third parties may have pending applications, unknown to us, which may later result in issued patents that cover the production, manufacture, commercialization or use of our product candidates. Our existing patents and any future patents we obtain may not be sufficiently broad to prevent others from practicing our technologies or from developing competing products. They may also be negatively impacted by the decisions of foreign courts, which could limit the protection contemplated by the original regulatory approval and our ability to thwart the development of competing products that might otherwise have been determined to infringe our intellectual property rights. Furthermore, others may independently develop similar or alternative technologies or design around our patents. In addition, our patents may be challenged or invalidated or may fail to provide us with any competitive advantages, if, for example, others were the first to invent or to file patent applications for closely related inventions.
The laws of some foreign countries do not protect intellectual property rights to the same extent as the laws of the U.S., and many companies have encountered significant problems in protecting and defending such rights in foreign jurisdictions. Many countries, including certain countries in Europe,the EU, have compulsory licensing laws based on related EU rules, under which a patent owner may be compelled to grant licenses to third parties (for example, the patent owner has failed to “work” the invention in that country or the third-partythird party has patented improvements). In addition, many countries
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limit the enforceability of patents against government agencies or government contractors. In these countries, the patent owner may have limited remedies, which could materially diminish the value of the patent. Initiatives seeking compulsory licensing of life-saving drugs are also becoming increasingly prevalent in developing countries either through direct legislation or international initiatives. Governments in those developing countries could require that we grant compulsory licenses to allow competitors to manufacture and sell their own versions of our products or product candidates, thereby reducing our product sales. Moreover, the legal systems of certain countries, particularly certain developing countries, do not favor the aggressive enforcement of patent and other intellectual property protection, which makes it difficult to stop infringement. We also rely on trade secret protection for some of our confidential and proprietary information. We have takeninformation, and we are taking security measures to protect our proprietary information and trade secrets, butparticularly in light of recent instances of data loss and misappropriation of intellectual property in the biopharmaceutical industry. However, these measures may not provide adequate protection. Whileprotection, and while we seek to protect our proprietary information by entering into confidentiality agreements with employees, collaboratorspartners and consultants, as well as maintain cybersecurity protocols within our information technology infrastructure, we cannot assure youprovide assurance that our proprietary information will not be disclosed, or that we can meaningfully protect our trade secrets. In addition, our competitors may independently develop substantially equivalent proprietary information or may otherwise gain access to our trade secrets.
Litigation or third-party claims of intellectual property infringement could require us to spend substantial time and money and adversely affect our ability to develop and commercialize products.
Our commercial success depends in part upon our ability to avoid infringing patents and proprietary rights of third parties and not to breach any licenses that we have entered into with regard to our technologies and the technologies of third parties. Other parties have filed, and in the future are likely to file, patent applications covering products and technologies that we have developed or intend to develop. If patents covering technologies required by our operations are issued to others, we may have to obtain licenses from third parties, which may not be available on commercially reasonable terms, or at all, and may require us to pay substantial royalties, grant a cross-license to some of our patents to another patent holder or redesign the formulation of a product candidate so that we do not infringe third-party patents, which may be impossible to accomplish or could require substantial time and expense.
In addition, we may be subject to claims that our employees or independent contractors have inadvertently or otherwise used or disclosed trade secrets or other proprietary information of their former employers, or that they used or sought to use patent inventions belonging to their former employers. Furthermore, third parties may obtain patents that relate to our technologies and claim that use of such technologies infringes on their patents or otherwise employs their proprietary technology without authorization. Regardless of their merit, such claims could require us to incur substantial costs includingand divert the diversionattention of management and key technical

personnel in defending ourselves against any such claims or enforcing our own patents. In the event that aof any third party’s successful claim of patent infringement is brought against us,or misappropriation of trade secrets, we may lose valuable intellectual property rights or personnel, which could impede or prevent the achievement of our product development goals, or we may be required to pay damages and obtain one or more licenses from these third parties, subjecting us to substantial royalty payment obligations. We may not be able to obtain these licenses on commercially reasonable terms, or at all. Defense of any lawsuit or failure to obtain any of these licenses could adversely affect our ability to develop and commercialize products.
We may be subjectRisks Related to damages resulting from claimsOur Operations, Managing Our Growth and Employee Matters
If the COVID-19 pandemic is further prolonged or becomes more severe, our business operations and corresponding financial results could suffer, which could have a material adverse impact on our financial condition and prospects for growth.
To date, the COVID-19 pandemic has had a modest impact on our business operations, in particular with respect to our clinical trial, drug discovery and commercial activities. For example, to varying degrees and at different rates across our clinical trials, we experienced declines in screening and enrollment activity during the early days of the COVID-19 pandemic, as well as delays in new site activations and restrictions on the access to treatment sites that we, our employees or independent contractors have wrongfully used or disclosed alleged trade secrets of their former employers.
Many of our employees and independent contractors were previously employed at universities or other biotechnology, biopharmaceutical or pharmaceutical companies, including our competitors or potential competitors. We may be subject to claims that we or these employees or independent contractors have inadvertently or otherwise used or disclosed trade secrets or other proprietary information of their former employers, or used or sought to use patent inventions belonging to their former employers. Litigation may beis necessary to defend against these claims. Even if we are successfulmonitor clinical study progress and administration. As the COVID-19 pandemic continues to have a significant presence in defending against these claims, litigationvarious parts of the world, particularly with the emergence of the Delta, Omicron and other SARS-CoV-2 variants, the impact on our clinical development operations could result in substantial costs and divert management’s attention. If we fail in defending such claims, in addition to paying damages, we may lose valuable intellectual property rightscontinue or personnel. A loss of key research personnel and/grow more severe. We anticipate that a further prolonged, or their work productmore severe, global public health crisis could hamper or preventlimit our ability to developidentify and work with clinical investigators at clinical trial sites globally to enroll, initiate and maintain treatment per protocol of patients for our ongoing clinical trials. Disruptions to medical and administrative operations at clinical trial sites, including staffing and materials shortages and the implementation of crisis management initiatives, have and may continue to reduce personnel and other resources necessary to conduct our clinical trials, which could further delay some of our clinical trial plans or commercializemay require certain trials to be temporarily suspended.
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Moreover, quarantines and travel restrictions have impeded and may continue to impede patient movement or interrupt healthcare services, which we anticipate over time, could also delay, interfere with and potentially negatively impact clinical trial execution, and ultimately results, particularly with respect to clinical trials evaluating our or our collaboration partners’ product candidates that must be administered via intravenous infusion. In addition, increased costs connected with our efforts to mitigate the adverse impacts resulting from the COVID-19 pandemic on our clinical trials could cause the expenses we incur in conducting those clinical trials to increase considerably. Depending upon the duration and severity of the COVID-19 pandemic, we could also experience delays in planning and conducting new clinical trials of the investigative product candidates entering and advancing through our development pipeline, which could severely harmincrease the operating expenses associated with these trials and adversely affect their timelines for completion and ultimately our business.ability to obtain regulatory approvals.
Risks RelatedBoth drug discovery work in our laboratories and outsourced drug discovery activities have fully resumed following temporary suspensions during the early days of the COVID-19 pandemic; however, we may be unable to Employeesmaximize the potential of these programs due to the imposition of increased safety protocols, and Locationshould the effects of the COVID-19 pandemic become more severe, we may have to again scale back or suspend activities in the future. We are also reliant on laboratory materials manufactured and distributed from areas impacted by both the COVID-19 pandemic and other natural disasters, for which supply has become limited. If we are unable to obtain the requisite materials to conduct our planned drug discovery activities, we may be required to redirect the focus of, or even suspend, such activities. Should the COVID-19 pandemic be further prolonged or grow in severity, we may ultimately be unable to achieve our drug discovery and preclinical development objectives within the previously disclosed timelines, which could have a material adverse impact on our prospects for growth.
While we believe that our commercial business has, to date, only experienced a modest impact related to the COVID-19 pandemic, it remains possible that over a longer period, changes to our standard sales and marketing practices, including any shifts from in-person back to primarily telephonic and virtual interactions with healthcare professionals, could negatively impact the flow of important information regarding our medicines, which along with obstacles to patient access to healthcare professionals, could diminish sales of our marketed products.
Although as of the date of this Annual Report on Form 10-K, we continue to maintain sufficient safety stock inventories for our drug substance and drug products and have not experienced significant production delays or seen significant impairment to our supply chain as a result of the COVID-19 pandemic, our third-party contract manufacturers and suppliers could experience operational delays due to facility closures and other hardships as a result of the COVID-19 pandemic, which could impact our supply chain by potentially causing delays to or disruptions in the supply of our commercial or clinical products or product candidates. These delays or disruptions could be further exacerbated if the COVID-19 pandemic begins to impact essential distribution systems, which could substantially increase delivery times and costs, or otherwise adversely affect our ability to provide our products to customers and clinical trial sites and generate product revenues.
In addition, as a result of broad economic shifts during and as a consequence of efforts to address unemployment and other negative economic effects of the COVID-19 pandemic, we may experience reductions in the net price of our products. For example, there may be a substantial shift from private health insurance coverage to government insurance coverage, or additional downward pressure on the prices government purchasers will pay for our products due to significant increases in government debt incurred in connection with relief efforts, as well as significant increases in demand for our patient assistance and/or free drug program or other impacts that may not be foreseeable, all or any of which would adversely affect our product revenues.
While we expect the COVID-19 pandemic to continue to have varying degrees of adverse impact on our business operations and, potentially in the future, our financial results, the extent of such adverse impact will depend on future developments that are highly uncertain and cannot be predicted with confidence at this time. Such developments include, but are not limited to: continued spread of the Delta and Omicron variants in the U.S. and other countries and the potential emergence of other SARS-CoV-2 variants that may prove especially contagious or virulent, the ultimate duration of the pandemic and resulting disruptions to normal business and personal activities in the U.S. and in other countries, and the effectiveness of actions taken globally to contain and treat the disease, including the rate at which vaccinations are made available and are administered, the percentage of the population that becomes fully vaccinated and the effectiveness of the vaccines against Delta, Omicron or other SARS-CoV-2 variants. These continuing or future effects could materially and adversely affect our business, financial condition, results of operations and growth prospects, and exacerbate the other risks and uncertainties described elsewhere in this ‘‘Risk Factors’’ section.
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If we are unable to manage our growth, there could be a material adverse impact on our business, financial condition and results of operations, and our prospects may be adversely affected.
We have experienced and expect to continue to experience growth in the number of our employees and in the scope of our operations.operations, in particular as we continue to expand the cabozantinib franchise into new indications and grow our pipeline of product candidates. This growth places significant demands on our management operational and financial resources, and our current and planned personnel facilities, systems, procedures and controlsoperating practices may not be adequate to support our growth. To effectively manage our growth, we must continue to improve existing, and implement new, facilities, operational and financial systems, and procedures and controls, and mustas well as expand, train and manage our growing employee base, and there can be no assurance that we will effectively manage our growth without experiencing operating inefficiencies or control deficiencies. We expect that we may needcontinue to increase our management personnel to oversee our expanding operations, and recruiting and retaining qualified individuals is difficult. If we are unable to manage our growth effectively, including as a result of the COVID-19 pandemic or otherwise, or we are unsuccessful in recruiting qualified management personnel, there could be a material adverse impact on our business, financial condition and results of operations, and our prospects may be adversely affected.operations.
The loss of key personnel or the inability to retain and, where necessary, attract additional personnel could impair our ability to operate and expand our operations.
We are highly dependent upon the principal members of our management, as well as clinical, commercial and scientific staff, the loss of whose services might adversely impact the achievement of our objectives. Also, we may not have sufficient personnel to execute our business plans. Retaining and, where necessary, recruiting qualified clinical, commercial, scientific and scientificpharmaceutical operations personnel will be critical to support activities related to advancing the development program for the cabozantinib franchise and our other compounds,product candidates, successfully executing upon our commercialization plan for the cabozantinib franchise and our internal proprietary research and development efforts. Competition is intense for experienced clinical, commercial, scientific and scientificpharmaceutical operations personnel, and we may be unable to retain or recruit such personnel with the expertise or experience necessary to allow us to successfully develop and commercialize our products. Further, all of our employees are employed “at will” and, therefore, may leave our employment at any time.
Additionally, in the second quarter of 2018, we moved our corporate headquarters from South San Francisco, California to Alameda, California. This relocation may make it more difficult to retain certain employees, and any resulting loss of talent and need to recruit and train new employees could be disruptive to our business.
Our operations might be interrupted by the occurrence of a natural disaster or other catastrophic event.
Our headquarters in Alameda, California is located in the San Francisco Bay Area, and therefore our facilities are vulnerable to damage from earthquakes. We have limited earthquake insurance, which may not cover all of the damage we may suffer in the event of an earthquake. We are also vulnerable to damage from other types of disasters, including fires and floods, which have become a significant danger in California during recent years, as well as power loss, communications failures, terrorism and similar events, and any insurance we may maintain may be inadequate to cover our losses. If any

disaster were to occur, our ability to operate our business at our facilities could be seriously, or potentially completely, impaired. In addition, a disaster could cause significant delays in our programs and make it difficult for us to recover due to the unique nature of our research activities. Accordingly, an earthquake or other disaster could materially and adversely harm our ability to conduct business.
Facility security breaches may disrupt our operations, subject us to liability and harm our operating results.
Any break-in or trespass at our facilities that results in the misappropriation, theft, sabotage or any other type of security breach with respect to our proprietary and confidential information, including research or clinical data, or that results in damage to our research and development equipment and assets, or that results in physical or psychological harm to any of our employees, could subject us to liability and have a material adverse impact on our business, financial condition and results of operations.
Risks Related to Environmental and Product Liability
We use hazardous chemicals and biological materials in our business. Any claims relating to improper handling, storage or disposal of these materials could be time consuming and costly.
Our research and development processes involve the controlled use of hazardous materials, including chemicals and biological materials. Ourmaterials, and our operations can produce hazardous waste products. We cannot eliminate the risk of accidental contamination or discharge, andor any resultant injury from these materials. Federal, statematerials, and local laws and regulations govern the use, manufacture, storage, handling and disposal of hazardous materials. Wewe may face liability under applicable laws for any injury or contamination that results from our use or the use by our collaboration partners or other third parties of these materials, and suchmaterials. Such liability may exceed our insurance coverage and our total assets. Complianceassets, and in addition, we may be required to indemnify our collaboration partners against all damages and other liabilities arising out of our development activities or products produced in connection with our collaborations with them. Moreover, our continued compliance with environmental laws and regulations may be expensive, and current or future environmental regulations may impair our research, development and production efforts.
In addition, our collaborators may use hazardous materials in connection with our collaborative efforts. In the event of a lawsuit or investigation, we could be held responsible for any injury caused to persons or property by exposure to, or release of, any hazardous materials used by these parties. Further, we may be required to indemnify our collaborators against all damages and other liabilities arising out of our development activities or products produced in connection with these collaborations.
We face potential product liability exposure far in excess of our limited insurance coverage.
We may be held liable if any product we or our collaboratorscollaboration partners develop or commercialize causes injury or is found otherwise unsuitable during product testing, manufacturing, marketing or sale. Regardless of merit or eventual outcome, product liability claims could result in decreased demand for our products and product candidates, injury to our reputation, withdrawal of patients from our clinical trials, product recall, substantial monetary awards to third parties and the inability to commercialize any products that we may develop in the future. These claims might be made directly by consumers, health care providers, pharmaceutical companies or others selling or testing our products. We have obtainedmaintain limited product liability insurance coverage for our clinical trials and commercial activities for cabozantinib in the amount of $20.0 million per occurrence and $20.0 million in the aggregate.cabozantinib. However, our insurance may not reimburse us or may not be sufficient to reimburse us for expenses or losses we may suffer. Moreover, if insurance coverage becomes more expensive, we may not be able to maintain insurance coverage at a reasonable cost or in sufficient amounts to protect us against losses due to liability. On occasion, juries have awarded large judgments in class action lawsuits for claims based on drugs that had unanticipated side effects. In addition, the pharmaceutical, biopharmaceutical and biotechnology industries, in general, have been subject to significant medical malpractice litigation. A successful product liability claim or series
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Risks Related to Our Common Stock
We expect that our quarterly results of operations will fluctuate, and this fluctuation could cause our stock price to decline, causing investor losses.
Our quarterly operating results have fluctuated in the past and are likely to fluctuate in the future. A number of factors, many of which we cannot control, could subject our operating results to volatility, including:
the commercial success of both CABOMETYX and COMETRIQ and the revenues we generate from those approved products;

customer ordering patterns for CABOMETYX and COMETRIQ, which may vary significantly from period to period as a result of multiple factors, including pricing information required to be disclosed by us pursuant to drug pricing transparency laws;
the overall level of demand for CABOMETYX and COMETRIQ, including the impact of any competitive products and the duration of therapy for patients receiving CABOMETYX or COMETRIQ;
the achievement of stated regulatory and commercial milestones and royalties paid under our collaboration agreements with Ipsen and Takeda;
the commercial success of and revenues generated by products marketed under our collaboration and license agreements;
changes in the amount of deductions from gross sales, including changes to the discount percentage of rebates and chargebacks mandated by the government programs in which we participate, including increases in the government discount percentage resulting from price increases we have taken or may take in the future, or due to different levels of utilization by entities entitled to government rebates and chargebacks and changes in patient demographics;
costs associated with maintaining our sales, marketing, market access, medical affairs and product distribution capabilities for CABOMETYX and COMETRIQ;
the achievement of stated regulatory and commercial milestones under our collaboration agreements;
the progress and scope of other development and commercialization activities for cabozantinib and our other compounds;
future clinical trial results;
our future investments in the expansion of our pipeline through drug discovery and business development activities;
the inability to obtain adequate product supply for any approved drug product or inability to do so at acceptable prices;
recognition of upfront licensing or other fees or revenues;
payments of non-refundable upfront or licensing fees, or payment for cost-sharing expenses, to third parties;
the introduction of new technologies or products by our competitors;
the timing and willingness of collaborators to further develop or, if approved, commercialize our product candidates out-licensed to them;
the termination or non-renewal of existing collaborations or third-party vendor relationships;
regulatory actions with respect to our product candidates and any approved products or our competitors’ products;
disputes or other developments relating to proprietary rights, including patents, litigation matters and our ability to obtain patent protection for our technologies;
the timing and amount of expenses incurred for clinical development and manufacturing of cabozantinib;
adjustments to expenses accrued in prior periods based on management’s estimates after the actual level of activity relating to such expenses becomes more certain;
the impairment of acquired goodwill and other assets;
significant fluctuations in interest rates or foreign currency exchange rates;
general and industry-specific economic conditions that may affect our or our collaborators’ research and development expenditures; and
other factors described in this “Risk Factors” section.
In addition, in the fourth quarter of 2018, we determined, based on our facts and circumstances, that it was more likely than not that a substantial portion of our deferred tax assets would be realized and, as a result, substantially all of our valuation allowance against deferred tax assets was released. Therefore, beginning in 2019, we expect to commence recording income tax expense at an estimated tax rate that will likely approximate statutory tax rates, which would result in a significant reduction in our net income and net income per share.
Due to the possibility of such fluctuations in our revenues and expenses, we believe that quarter-to-quarter comparisons of our operating results are not a good indication of our future performance. As a result, in some future

quarters, our operating results may not meet the expectations of securities analysts and investors, which could result in a decline in the price of our common stock.
Our stock price has been and may in the future be highly volatile.
The trading price of our common stock has been highly volatile, and we believe the trading price of our common stock willit may remain highly volatile and mayor fluctuate substantially due to factors such as the following, many of which we cannot control:
adverse or inconclusive results or announcements related to our or our collaborators’ clinical trials or delays in those clinical trials;
the announcement of FDA or other regulatory approval or non-approval, or delays in the FDA or other regulatory review process with respect to cabozantinib, our collaborators’collaboration partners’ product candidates being developed in combination with cabozantinib, or our competitors’ product candidates;
the commercial successperformance of both CABOMETYX and COMETRIQ and the revenues we generate from those approved products;products, including royalties paid under our collaboration and license agreements;
adverse or inconclusive results or announcements related to our or our collaboration partners’ clinical trials or delays in those clinical trials;
the timing of achievement of our clinical, regulatory, partnering, commercial and other milestones such asfor the commencement of clinical development, the completion of a clinical trial, the filing for regulatory approval or the establishment of collaborative arrangements for cabozantinib franchise or any of our other programs or compounds;product candidates;
our ability to make future investments in the expansion of our pipeline through drug discovery, including future research collaborations, in-licensing arrangements and other strategic transactions;
our ability to obtain the materials and services, including an adequate product supply for any approved drug product, from our third-party vendors or do so at acceptable prices;
the timing and amount of expenses incurred for clinical development and manufacturing of cabozantinib;
actions taken by regulatory agencies, both in the U.S. and abroad, with respect to cabozantinib or our clinical trials for cabozantinib;
unanticipated regulatory actions taken by the FDA as a result of changing FDA standards and practices concerning the review of product candidates, including approvals at earlier stages of clinical development or with lesser developed data sets and expedited reviews;
the announcement of new products or clinical trial data by our competitors;
the announcement of regulatory applications, such as MSN’s and Teva’s respective ANDAs, seeking a path to U.S. approval of generic versions of our marketed products;
quarterly variations in our or our competitors’ results of operations;
developmentschanges in our relationships with our collaborators,collaboration partners, including the termination or modification of our agreements;agreements, or other events or conflicts that may affect our collaboration partners’ timing and willingness to develop, or if approved, commercialize our products and product candidates out-licensed to them;
the announcement of an in-licensed product candidate or strategic acquisition;
conflicts or litigation with our collaborators;
litigation, including intellectual property infringement and product liability lawsuits, involving us;
failure to achieve operating results projected by securities analysts;
changes in earnings estimates or recommendations by securities analysts;analysts, or financial guidance from our management team, and any failure to achieve the operating results projected by securities analysts or by our management team;
the entry into new financing arrangements;
developments in the biotechnology, biopharmaceutical or pharmaceutical industry;
sales of large blocks of our common stock or sales of our common stock by our executive officers, directors and significant stockholders;
additions and departures of key personnel or board members;
the extent to which coverage and adequate reimbursement is available for both CABOMETYX and COMETRIQ from government and health administration authorities, private health insurers, managed care programs and other third-party payers;
disposition of any of our technologies or compounds; and
general market, economic and political conditions and other factors, including factors unrelated to our operating performance or the operating performance of our competitors.
These and other factors as well as general economic, political and market conditions, may materially adversely affectcould have material adverse impact on the market price of our common stock. In addition, the stock markets in general, and the markets for biotechnology and pharmaceutical stocks in particular, have historically experienced significant volatility that has often been unrelated or disproportionate to the operating performance of particular companies. For example, negative publicity regarding drug pricing and price increases by pharmaceutical companies has negatively impacted, and may continue to negatively impact,

the markets for biotechnology and pharmaceutical stocks. Likewise, as a result of the pending Brexit and/or significant changes in U.S. social,or global political regulatory and economic conditions, or in laws and policies governing foreign trade and health carehealthcare spending and delivery, including possible repeal and/or replacement of all or portions of PPACA or increases or changes in tariffs and other trade restrictions stemming from Trump administration and foreign government policies, or future potential U.S. federal government shutdowns, the financial markets could continue to experience significant volatility that could also continue to negatively impact the
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markets for biotechnology and pharmaceutical stocks. These broad market fluctuations have adversely affected and may in the future adversely affect the trading price of our common stock. Excessive volatility may continue for an extended period of time following the date of this report.
In the past, following periods of volatility in the market price of a company’s securities, securities class action litigation has often been instituted.initiated. A securities class action suit against us could result in substantial costs and divert management’sthe attention and resources,of management, which could have a material adverse impact on our business, financial condition and results of operations.
Anti-takeover provisions in our charter documents and under Delaware law could make an acquisition of us, which may be beneficial to our stockholders, more difficult and may prevent or deter attempts by our stockholders to replace or remove our current management, which could cause the market price of our common stock to decline.
Provisions in our corporate charter and bylaws may discourage, delay or prevent an acquisition of us, a change in control, or attempts by our stockholders to replace or remove members of our current Board of Directors. Because our Board of Directors is responsible for appointing the members of our management team, these provisions could in turn affect any attempt by our stockholders to replace current members of our management team. These provisions include:
a classified Board of Directors;
a prohibition on actions by our stockholders by written consent;
the inability of our stockholders to call special meetings of stockholders;
the ability of our Board of Directors to issue preferred stock without stockholder approval, which could be used to institute a “poison pill” that would work to dilute the stock ownership of a potential hostile acquirer, effectively preventing acquisitions that have not been approved by our Board of Directors; and
limitations on the removal of directors; and
advance notice requirements for director nominations and stockholder proposals.
Moreover, because we are incorporated in Delaware, we are governed by the provisions of Section 203 of the Delaware General Corporation Law, which prohibits a person who owns in excess of 15% of our outstanding voting stock from merging or combining with us for a period of three years after the date of the transaction in which the person acquired in excess of 15% of our outstanding voting stock, unless the merger or combination is approved in a prescribed manner.
Item 1B. Unresolved Staff Comments
None.
Item 2. Properties
WeOur corporate headquarters is located in Alameda, California, where we lease a total of 134,765254,690 square feet of office and research facilitiesspace. We took possession of an additional 25,749 square feet of space in the San Francisco Bay Area.2021. The lease expires in January 2028.October 2031. We have two five-year options to extend the lease. In October 2019, we entered into a build-to-suit lease andagreement (the Build-to-Suit Lease) for approximately 220,000 square feet of additional office facilities adjacent to our current corporate headquarters. The term of the Build-to-Suit Lease is for a one-time option to terminate the lease without causeperiod of 242 months, which will begin on the last daysubstantial completion of the 8th yearbuilding and tenant improvements by the lessor. We currently anticipate that the term will begin in the first quarter of the initial term.2022. We believe that our existingthese leased facilities as well as our rights to acquire additional space under our existing lease arrangements are sufficient to accommodate our current and near-term needs.
Item 3. Legal Proceedings
In September 2019, we received a notice letter regarding an ANDA submitted to the FDA by MSN, requesting approval to market a generic version of CABOMETYX tablets. MSN’s initial notice letter included a Paragraph IV certification with respect to our U.S. Patent Nos. 8,877,776 (salt and polymorphic forms), 9,724,342 (formulations), 10,034,873 (methods of treatment) and 10,039,757 (methods of treatment), which are listed in the Orange Book for CABOMETYX. MSN’s initial notice letter did not provide a Paragraph IV certification against the ’473 Patent (composition of matter) or U.S. Patent No. 8,497,284 (methods of treatment), each of which is listed in the Orange Book. On October 29, 2019, we filed a complaint in the Delaware District Court for patent infringement against MSN asserting infringement of U.S. Patent No. 8,877,776 arising from MSN’s ANDA filing with the FDA. On November 20, 2019, MSN filed its response to the complaint, alleging that the asserted claims of U.S. Patent No. 8,877,776 are invalid and not infringed. On May 5, 2020, we received notice from MSN that it had amended its ANDA to include additional Paragraph IV certifications. In particular, the ANDA requested approval to market a generic version of CABOMETYX tablets prior to expiration of two previously unasserted CABOMETYX patents: the ‘473 Patent and U.S. Patent No. 8,497,284. On May 11, 2020, we filed a complaint in the Delaware
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District Court for patent infringement against MSN asserting infringement of the ‘473 Patent and U.S. Patent No. 8,497,284 arising from MSN’s amended ANDA filing with the FDA. Neither of our complaints have alleged infringement of U.S. Patent Nos. 9,724,342, 10,034,873 and 10,039,757. On May 22, 2020, MSN filed its response to the complaint, alleging that the asserted claims of the ‘473 Patent and U.S. Patent No. 8,497,284 are invalid and not infringed. On March 23, 2021, MSN filed its First Amended Answer and Counterclaims (amending its prior filing from May 22, 2020), seeking, among other things, a declaratory judgment that U.S. Patent No. 9,809,549 is invalid and would not be infringed by MSN if its generic version of CABOMETYX tablets were approved by the FDA. U.S. Patent No. 9,809,549 is not listed in the Orange Book. On April 7, 2021, we filed our response to MSN’s First Amended Answer and Counterclaims, denying, among other things, that U.S. Patent No. 9,809,549 is invalid or would not be infringed.
On October 1, 2021, pursuant to a stipulation between us and MSN, the Delaware District Court entered an order that (i) MSN’s submission of its ANDA constitutes infringement of certain claims relating to the ‘473 Patent and U.S. Patent No. 8,497,284, if those claims are not found to be invalid, and (ii) upon approval, MSN’s commercial manufacture, use, sale or offer for sale within the U.S., and importation into the U.S., of MSN’s ANDA product prior to the expiration of the ‘473 Patent and U.S. Patent No. 8,497,284 would also infringe certain claims of each patent, if those claims are not found to be invalid. Then, on October 12, 2021, pursuant to a separate stipulation between us and MSN, the Delaware District Court entered an order dismissing MSN’s counterclaims with respect to U.S. Patent No. 9,809,549. In our complaints, we are seeking, among other relief, an order that the effective date of any FDA approval of MSN’s ANDA be a date no earlier than the expiration of all of the ‘473 Patent, U.S. Patent No. 8,497,284 and U.S. Patent No. 8,877,776, the latest of which expires on October 8, 2030, and equitable relief enjoining MSN from infringing these patents. A bench trial has been scheduled for May 2022.
On January 11, 2022, we received notice from MSN that it had further amended its ANDA to assert additional Paragraph IV certifications. The ANDA now requests approval to market a generic version of CABOMETYX tablets prior to expiration of four previously-unasserted CABOMETYX patents that are now listed in the Orange Book: U.S. Patent Nos. 11,091,439 (salt and polymorphic forms) 11,091,440 (formulations) and 11,098,015 (methods of treatment). We have 45 days from the receipt of the January 11, 2022 notice to file a patent infringement claim against MSN relating to the newly challenged patents.
In May 2021, we received notice letters from Teva regarding an ANDA Teva submitted to the FDA, requesting approval to market a generic version of CABOMETYX tablets. Teva’s notice letters included a Paragraph IV certification with respect to our U.S. Patent Nos. 9,724,342 (formulations), 10,034,873 (methods of treatment) and 10,039,757 (methods of treatment), which are listed in the Orange Book and expire in 2033, 2031 and 2031, respectively. Teva’s notice letters did not provide a Paragraph IV certification against any additional CABOMETYX patents. On June 17, 2021, we filed a complaint in the Delaware District Court for patent infringement against Teva, along with Teva Parent, asserting infringement of U.S. Patent Nos. 9,724,342, 10,034,873 and 10,039,757 arising from Teva’s ANDA filing with the FDA. On August 27, 2021, Teva filed its answer and counterclaims to the complaint, alleging that the asserted claims of U.S. Patent Nos. 9,724,342, 10,034,873 and 10,039,757 are invalid and not infringed, and on August 23, 2021, we and Teva entered into a stipulation wherein Teva Parent was dismissed without prejudice from this lawsuit and agreed to be bound by any stipulation, judgment, order or decision rendered as to Teva, including any appeals and any order granting preliminary or permanent injunctive relief against Teva. On September 17, 2021, we filed an answer to Teva’s counterclaims. We are notseeking, among other relief, an order that the effective date of any FDA approval of Teva’s ANDA be a partydate no earlier than the expiration of all of U.S. Patent Nos. 9,724,342, 10,034,873 and 10,039,757, the latest of which expires on July 9, 2033, and equitable relief enjoining Tevafrom infringing these patents. On February 8, 2022, the parties filed a stipulation to any material legal proceedings. stay all proceedings, which was granted by the Delaware District Court on February 9, 2022. The stipulation and order were filed under seal.
We may also from time to time become a party or subject to various other legal proceedings and claims, either asserted or unasserted, which arise in the ordinary course of business. Some of these proceedings have involved, and may involve in the future, claims that are subject to substantial uncertainties and unascertainable damages.

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
Our common stock has traded on the Nasdaq Global Select Market under the symbol “EXEL” since April 11, 2000.
Holders
On February 12, 2019,7, 2022, there were 398347 holders of record of our common stock. The number of record holders is based upon the actual number of holders registered on our books at such date and does not include holders of shares in “street names” or persons, partnerships, associations, corporations or other entities identified in security position listings maintained by depository trust companies.
Dividends
Since inception, we have not paid dividends on our common stock. We currently intend to retain all future earnings, if any, for use in our business and currently do not plan to pay any cash dividends in the foreseeable future. Any future determination to pay dividends will be at the discretion of our Board of Directors.
Unregistered Sales of Equity Securities
There were no unregistered sales of equity securities by us during the year ended December 31, 2018.2021.

There were no repurchases of our common stock during the year ended December 31, 2021.
Performance
This performance graph shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities under that Section and shall not be deemed to be incorporated by reference into any filing of ours under the Securities Act of 1933, as amended.
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The following graph compares, for the five yearfive-year period ended December 31, 2018,2021, the cumulative total stockholder return for our common stock, the Nasdaq Composite Index and the Nasdaq Biotechnology Index. The graph assumes that $100 was invested on December 31, 20132016 in each of our common stock, the Nasdaq Composite Index and the Nasdaq Biotechnology Index and assumes reinvestment of any dividends. The stock price performance on the following graph is not necessarily indicative of future stock price performance.
fiveyearchart2018.jpgexel-20211231_g2.jpg
Year Ended December 31,
201620172018201920202021
Exelixis, Inc.100 204 130 114 135 123 
Nasdaq Composite Total Return100 130 125 173 250 305 
Nasdaq Biotechnology Total Return100 122 109 136 175 175 
Item 6. Reserved
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 December 31,
 2013 2014 2015 2016 2017 2018
Exelixis, Inc.100
 28
 95
 251
 513
 328
Nasdaq Composite Index100
 114
 120
 130
 166
 158
Nasdaq Biotechnology Index100
 136
 150
 117
 142
 127


Item 6. Selected Financial Data
The following Selected Financial Data has been derived from our audited Consolidated Financial Statements and should be read in conjunction with Part II, Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and Part II, Item 8. “Financial Statements and Supplementary Data” contained in this Annual Report on Form 10-K. The consolidated financial information as of December 31, 2018 and 2017 and for the years ended, December 31, 2018, 2017, and 2016 are derived from audited Consolidated Financial Statements included elsewhere in this Annual Report on Form 10-K. The consolidated financial information as of December 31, 2016, 2015 and 2014, and for each of the years ended December 31, 2015 and 2014, are derived from audited Consolidated Financial Statements not included in this Annual Report on Form 10-K.  
 Year Ended December 31,
 2018 2017 2016 2015 2014
 (In thousands, except per share data)
Consolidated Statements of Operations Data:         
Revenues$853,826
 $452,477
 $191,454
 $37,172
 $25,111
Operating expenses:         
Cost of goods sold26,348
 15,066
 6,552
 3,895
 2,043
Research and development182,257
 112,171
 95,967
 96,351
 189,101
Selling, general and administrative206,366
 159,362
 116,145
 57,305
 50,829
Restructuring (recovery) charge
 (32) 914
 1,042
 7,596
Total operating expenses414,971
 286,567
 219,578
 158,593
 249,569
Income (loss) from operations438,855
 165,910
 (28,124) (121,421) (224,458)
Other income (expenses), net13,237
 (7,333) (42,098) (40,268) (37,021)
Income (loss) before income taxes452,092
 158,577
 (70,222) (161,689) (261,479)
Income tax benefit (provision)237,978
 (4,350) 
 (55) 182
Net income (loss)$690,070
 $154,227
 $(70,222) $(161,744) $(261,297)
Net income (loss) per share, basic$2.32
 $0.52
 $(0.28) $(0.77) $(1.34)
Net income (loss) per share, diluted$2.21
 $0.49
 $(0.28) $(0.77) $(1.34)
Shares used in computing net income (loss) per share, basic297,892
 293,588
 250,531
 209,227
 194,299
Shares used in computing net income (loss) per share, diluted312,803
 312,003
 250,531
 209,227
 194,299
 December 31,
 2018 2017 2016 2015 2014
 (In thousands)
Consolidated Balance Sheet Data:         
Cash and investments$851,621
 $457,176
 $479,554
 $253,310
 $242,760
Working capital (deficit)$791,544
 $369,704
 $200,215
 $126,414
 $(3,188)
Total assets$1,422,286
 $655,294
 $595,739
 $332,223
 $323,256
Long-term obligations$29,361
 $255,163
 $237,635
 $420,897
 $312,163
Accumulated deficit$(880,363) $(1,829,172) $(1,983,147) $(1,912,925) $(1,751,181)
Total stockholders’ equity (deficit)$1,287,453
 $284,961
 $89,318
 $(140,806) $(159,324)

Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations
Some of the statements under in this “Management’s Discussion and Analysis of Financial Condition and Results of Operations” are forward-looking statements. These statements are based on our current expectations, assumptions, estimates and projections about our business and our industry and involve known and unknown risks, uncertainties and other factors that may cause our company’s or our industry’s results, levels of activity, performance or achievements to be materially different from any future results, levels of activity, performance or achievements expressed or implied in, or contemplated by, the forward-looking statements. Our actual results and the timing of events may differ significantly from the results discussed in the forward-looking statements. Factors that might cause such a difference include those discussed in “Item 1A. Risk Factors” as well as those discussed elsewhere in this Annual Report on Form 10-K. These and many other factors could affect our future financial and operating results. We undertake no obligation to update any forward-looking statement to reflect events after the date of this report.
We have adopted a 52- or 53-week fiscal year policy that generally ends on the Friday closest to December 31st. Fiscal year 2016 ended on December 30, 2016; fiscal year 2017 ended on December 29, 2017; fiscal year 2018 ended on December 28, 2018; and fiscal year 2019 will end on January 3, 2020. For convenience, references in this report as of and for the fiscal years ended (or ending, as applicable) December 30, 2016, December 29, 2017, December 28, 2018 and January 3, 2020 are indicated as being as of and for the years ended (or ending, as applicable) December 31, 2016, 2017, 2018 and 2019, respectively. The annual period and quarterly period ending January 3, 2020 are a 53-week fiscal year and a 14-week fiscal quarter, respectively; all other annual periods presented are 52-week fiscal years and all interim periods presented are 13-week fiscal quarters.
Overview
We are an oncology-focused biotechnology company that aimsstrives to accelerate the discovery, development and commercialization of new medicines for difficult-to-treat cancers. SinceUsing our considerable drug discovery, development and commercialization resources and capabilities, we were founded in 1994,have invented and brought to market innovative therapies that appropriately balance patient benefits and risks; we will continue to build on this foundation as we strive to provide cancer patients with new treatment options that improve upon current standards of care.
Today, four products resulting from our discovery efforts have progressed through clinical development and received regulatory approval; three have a growing commercial presencethat originated in markets worldwide, and we expect that the fourth will soon enter the marketplace in Japan. TwoExelixis laboratories are derived from cabozantinib,available to be prescribed to patients. Sales related to our flagship molecule, cabozantinib, account for the large majority of our revenues. Cabozantinib is an inhibitor of multiple tyrosine kinases including MET, AXL, VEGF receptors and RET. These are:RET and has been approved by the FDA and in 61 other countries as: CABOMETYX tablets approved for advanced RCC, both alone and in combination with OPDIVO, for previously treated HCC and, currently by the FDA, for previously treated, RAI-refractory DTC; and COMETRIQ capsules approved for progressive metastatic MTC. For these types of cancer, cabozantinib has become or is becoming an important drug in their selection of effective therapies.
The other two other products resulting from our discovery efforts are: COTELLIC, an inhibitor of MEK, approved as part of amultiple combination regimenregimens to treat specific forms of advanced melanoma and marketed under a collaboration with Genentech; and MINNEBRO, an oral, non-steroidal, selective blocker of the MRmineralocorticoid receptor, approved for the treatment of hypertension in Japan and licensed to Daiichi Sankyo. For additional information about these products, see “Business—Collaborations and Business Development Activities—Other Collaborations” in Part I, Item 1 of this Annual Report on Form 10-K.
CABOMETYX was first approvedOur plan is to utilize our operating cash flows and cash and investments to expand the cabozantinib franchise by potentially adding new indications in areas of unmet medical need. We will also leverage our operating cash flows to continue advancing our diverse small molecule and biotherapeutics programs, exploring multiple modalities and mechanisms of action to discover new oncology drugs. So far, these drug discovery and preclinical activities have resulted in four clinical-stage compounds: XL092, a next-generation oral TKI; XB002, a TF-targeting ADC; XL102, a potent, selective and orally bioavailable covalent inhibitor of CDK7; and XL114, a novel anti-cancer compound that inhibits the CBM complex.
Cabozantinib Franchise
On January 22, 2021, the FDA approved CABOMETYX in combination with OPDIVO as a first-line treatment of patients with advanced RCC. This regulatory milestone expands upon the FDA’s prior approvals of CABOMETYX as a monotherapy for previously treated patients with advanced RCC in April 2016 and then in December 2017, approximately two months ahead of the assigned PDUFA action date, the FDA expanded CABOMETYX’s approval in this indication to includefor previously untreated patients with advanced RCC.RCC in December 2017. Additionally, in January 2019, the FDA approved CABOMETYX as afor the treatment forof patients with HCC who have been previously treated with sorafenib. Thissorafenib, and most recent approval was basedrecently, on results from CELESTIAL, our phase 3 pivotal trial evaluating cabozantinib inSeptember 17, 2021, the FDA approved CABOMETYX for the treatment of adult and pediatric patients 12 years of age and older with previously treated HCC, which demonstrated a statistically significantlocally advanced or metastatic DTC that has progressed following prior VEGF receptor-targeted therapy and clinically meaningful improvement in OS versus placebo. Wewho are highly focused on optimizing the execution of this commercial launch in HCC in the U.S. through our commercial and medical affairs organizations and established distribution network.RAI-refractory or ineligible.
To develop and commercialize CABOMETYX and COMETRIQ outside the U.S., we have entered into license agreements with Ipsen and Takeda. We granted to Ipsen has been grantedthe rights to develop and commercialize cabozantinib outside of the U.S. and Japan, and to Takeda has been grantedthe rights to develop and commercialize cabozantinib in Japan. Both partnersIpsen and Takeda also contribute financially and operationally to the further global development and commercialization of the cabozantinib franchise in other potential indications, and we continue to work closely with them on these activities. Utilizing its regulatory expertise and established international oncology marketing network, since the initiation of our collaboration Ipsen has continued to execute on its
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commercialization plans most recently receivingfor CABOMETYX, having received regulatory approval fromapprovals and launched in multiple territories outside of the EC for CABOMETYXU.S., including in the EU, the U.K. and Canada, as a treatment for advanced RCC and for HCC in adults who have previously been treated with sorafenib,sorafenib. In addition, in March 2021, Ipsen and Takeda continues to conduct clinical development activitiesBMS received regulatory approval from the EC for CABOMETYX in bothcombination with OPDIVO as a first-line treatment for patients with advanced RCC, and HCC,both Ipsen and BMS plan to submit applications to approve the combination in other territories beyond the EU. Ipsen also submitted a variation application to the EMA to approve CABOMETYX as a treatment for patients with previously treated, RAI-refractory DTC, with the goalEMA validating the variation and beginning its centralized review process in August 2021. With respect to the Japanese market, Takeda received Manufacturing and Marketing Approvals in 2020 from the Japanese MHLW of supporting future regulatory filingsCABOMETYX as a treatment of patients with curatively unresectable or metastatic RCC and as a treatment of patients with unresectable HCC who progressed after cancer chemotherapy. Most recently, in Japan.August 2021, Takeda and Ono Pharmaceutical Co., Ltd. (Ono), BMS’ development and commercialization partner in Japan, received Manufacturing and Marketing Approval from the Japanese MHLW of CABOMETYX in combination with OPDIVO as a treatment for unresectable or metastatic RCC.
In addition to our regulatory and commercialization efforts in the U.S. and the support provided to our collaboration partners for rest of worldrest-of-world regulatory and commercialization activities, we are also focused on the next wave of cabozantinib’s clinical development program, pursuing other indications for cabozantinib that have the potential to expandincrease the number of cancer patients who could potentially benefit from this medicine. We are evaluatingcontinue to evaluate cabozantinib, both as a single agent and in combination with other

therapies,ICIs, in a broad development program comprising over 75100 ongoing or planned clinical trials across multiple indications.tumor types. We, along with our clinical and commercial collaboration partners, sponsor some of the trials, and independent investigators conduct the remaining trials through our CRADA with NCI-CTEP or our IST program. Informed by the available data from these clinical trials, we continue to advance cabozantinib’s late-stageadvanced the development program. One pivotal trial that has resultedprogram for the cabozantinib franchise with potentially label-enabling trials, including COSMIC-311, and positive results from this effort is COSMIC-311 our phase 3 trial evaluating cabozantinib in patients with RAI-refractoryserved as the basis for the FDA’s September 2021 DTC who have progressed after up to two VEGF receptor-targeted therapies initiated in October 2018.approval for CABOMETYX.
We are particularly interested in examining cabozantinib’s potential in combination with ICIs to determine if such combinations further improve outcomes for patients. Building on preclinical and clinical observations that cabozantinib in combination with ICIs may promote a more immune-permissive tumor environment, potentially resulting in cooperative activitywe initiated numerous pivotal studies to further explore these combination regimens. The first of cabozantinibthese studies to deliver results was CheckMate -9ER, and positive results from CheckMate -9ER served as the basis for the FDA’s, EC’s and MHLW’s approvals of CABOMETYX in combination with these products, weOPDIVO as a first-line treatment of patients with advanced RCC in January 2021, March 2021 and August 2021, respectively. We are evaluating cabozantinib in combinationalso collaborating with a variety of ICIs in multiple clinical trials. The most advanced of these combination studies include Checkmate 9ER,BMS on COSMIC-313, a phase 3 pivotal trial evaluating cabozantinib inthe triplet combination with nivolumab in previously untreated advanced or metastatic RCC, and Checkmate 040, a phase 1/2 trial evaluatingof cabozantinib, in combination with nivolumab and inipilimumab versus the combination with bothof nivolumab and ipilimumab in patients with both previously treated and previously untreated advanced HCC. Both trials areintermediate- or poor-risk RCC. Enrollment for COSMIC-313 was completed in collaboration with BMS. As a further partMarch 2021, and we expect to report top-line results of our clinical collaboration with BMS, we also plan to evaluate cabozantinib and nivolumab with or without ipilimumabthe event-driven analyses from the trial in various other tumor types, including UC. Diversifyingthe first half of 2022.
To expand our exploration of combinations with ICIs, we have also initiated COSMIC-312, a phase 3 pivotal trialmultiple trials evaluating cabozantinib in combination with Roche’s ICI, atezolizumab, versus sorafenib in previously untreated advanced HCC, andatezolizumab. COSMIC-021 is a broad phase 1b dose escalation study evaluating the safety and tolerability of cabozantinib in combination with atezolizumab in patients with a wide variety of locally advanced or metastatic solid tumors. The COSMIC-021 study comprises eighteen tumor expansion cohorts, including multiple therapeutic settings of RCC, UC,Based on encouraging efficacy and NSCLC and single therapeutic settings of HCC, CRPC, TNBC, EOC, endometrial cancer, gastric or gastroesophageal junction adenocarcinoma, colorectal adenocarcinoma, DTC and head and neck cancer of squamous cell histology, and is currently enrolling. Findingssafety data that has emerged from the dose escalation stage oftrial, certain cohorts have been expanded, including Cohort 6 evaluating patients with mCRPC who have been previously treated with enzalutamide and/or abiraterone acetate and experienced radiographic disease progression in soft tissue and another cohort evaluating patients with NSCLC who have been previously treated with an ICI. We announced data from Cohort 6 in May 2021 and presented more detailed results from Cohort 6 at the study demonstrate thatESMO 2021 Congress in September 2021.
Although, following our discussions with the FDA, we will not pursue a regulatory submission for the combination was well-toleratedregimen in mCRPC based solely on the Cohort 6 results, data from COSMIC-021 have been instrumental in guiding our clinical development strategy for cabozantinib in combination with ICIs, including supporting the initiation of COSMIC-312, a phase 3 pivotal trial evaluating cabozantinib in combination with atezolizumab versus sorafenib in previously untreated advanced HCC, and showed encouraging anti-tumor activitythree phase 3 pivotal trials in collaboration with Roche, CONTACT-01, CONTACT-02 and CONTACT-03, evaluating the combination of cabozantinib with atezolizumab in patients with metastatic NSCLC, mCRPC and advanced RCC. Depending on theRCC, respectively. CONTACT-01 and CONTACT-03 are sponsored by Roche and co-funded by us; CONTACT-02 is sponsored by us and co-funded by Roche. In June 2021, we announced results from COSMIC-021,COSMIC-312. The trial met one of the primary endpoints, demonstrating significant improvement in BIRC assessed PFS at the planned primary analysis, reducing the risk of disease progression or death by 37% compared with sorafenib. The interim analysis for the second primary endpoint of OS, performed at the same time as the primary analysis for PFS, did not reach statistical significance. The trial is continuing as planned to the final analysis of OS, anticipated during the first quarter of 2022, and we may also evaluateintend to submit an sNDA to the FDA for the combination regimen if supported by the final OS analysis.
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For additional information on our cabozantinib clinical trials, see “Business—Exelixis Development Programs—Cabozantinib Development Program” in Part I, Item 1 of this combinationAnnual Report on Form 10-K.
Pipeline Activities
Our small molecule discovery programs are supported by a robust and expanding infrastructure, including a library of 4.6 million compounds. We have extensive experience in various other tumor types, including NSCLC. COSMIC-021 also includes two exploratory cohorts that will evaluate cabozantinib as a single-agent therapy in NSCLCthe identification and UC indications.
As we continueoptimization of drug candidates against multiple target classes for oncology, inflammation and metabolic diseases. The first compound to work to maximizeenter the clinical, therapeutic and commercial potentialclinic following our re-initiation of cabozantinib, we also remain committed to building our product pipeline by discovering and developing new cancer therapies for patients. In this regard, we have reinitiated internal drug discovery efforts with the goal of identifying new product candidates to advance into clinical trials. Notably, these efforts are led by some of the same experienced scientists responsible for the discovery of cabozantinib and cobimetinib, which have been approved for commercialization by regulatory authorities, as well as other promising compounds we have discovered, many of which areactivities in various stages of clinical, regulatory and commercial development pursuant to our collaborations with Daiichi Sankyo and BMS. Using our expertise in medicinal chemistry, tumor biology and pharmacology, we are advancing drug candidates toward and through preclinical development. Furthest along in these internal drug discovery efforts is2017 was XL092, a next-generation oral TKI that is currently the subject of an active IND.
These internal drug discovery activities are augmented by efforts to identifytargets VEGF receptors, MET, AXL, MER and in-license promising, early-stage oncology assets and then further develop them utilizing our established clinical development infrastructure. In furtherance of this strategy, in January 2018, we entered into an exclusive global collaboration and license agreement with StemSynergy for the discovery and development of novel oncology compounds aimed to inhibit tumor growth by targeting CK1α, a component of the Wnt signaling pathwayother kinases implicated in cancer’s growth and spread. In designing XL092, we sought to build upon our experience with cabozantinib, retaining a similar target profile while improving key oncogenic processes. Undercharacteristics, including the terms of this agreement, we have partnered with StemSynergy to conduct preclinical and clinical studies with compounds targeting CK1α. Additionally, in May 2018, we entered into a collaboration and license agreement with Invenra which is focused on developing next-generation biologics, to discover and develop multispecific antibodies for the treatment of cancer. Invenra is responsible for antibody lead discovery and generation while we will lead IND-enabling studies, manufacturing, clinical development in single-agent and combination therapy regimens, and future regulatory and commercialization activities. The collaboration agreement also provides that we will receive an exclusive, worldwide license to one preclinical asset, and that we will pursue up to six additional discovery projects during the term of the collaboration, which in total are directed to three discovery programs.pharmacokinetic half-life. To date, we have initiated two large phase 1b clinical trials studying XL092: STELLAR-001 and STELLAR-002. STELLAR-001 is a phase 1b clinical trial evaluating XL092, both as a monotherapy and in combination with either atezolizumab or Merck KGaA’s and Pfizer’s avelumab. We are continuing to enroll patients into the dose-escalation cohorts of the combination part of the trial, and we expect that once recommended doses are established for single-agent XL092, XL092 in combination with atezolizumab and XL092 in combination with avelumab, the trial will begin to enroll expansion cohorts for patients with clear cell and non-clear cell RCC, CRC, hormone-receptor positive breast cancer, mCRPC and UC. STELLAR-002 is a phase 1b clinical trial evaluating XL092 in combination with either nivolumab, nivolumab and ipilimumab, or nivolumab and Nektar’s bempegaldesleukin. We are enrolling patients with advanced solid tumors in dose-escalation cohorts, and depending on the dose-escalation results, STELLAR-002 may enroll expansion cohorts for patients with clear cell and non-clear cell RCC, mCRPC and UC. To better understand the individual contribution of the therapies, treatment arms in the expansion cohorts may include XL092 as a single-agent in addition to the ICI combination regimens. In addition to clinical updates for XL092 expected in 2022, we plan to initiate the first global phase 3 pivotal trial for the compound in the first half of the year, and other pivotal trials may follow throughout the year. This first planned trial, STELLAR-303, will evaluate XL092 in combination with atezolizumab versus regorafenib in patients with metastatic microsatellite stable CRC who have progressed after or are intolerant to the current standard of care.
We also augment our small molecule discovery activities through research collaborations and in-licensing arrangements with other companies. The most advanced compounds to emerge from these arrangements are XL102 , the lead program targeting CDK7 under our collaboration with Aurigene, and XL114, Aurigene’s novel anti-cancer compound that inhibits the CBM complex. Based on encouraging preclinical data, we have exercised our exclusive options to license each of XL102 and XL114 from Aurigene and initiated a phase 1 clinical trial evaluating XL102 in January 2021; we plan to initiate a phase 1 clinical trial for XL114 in the first half of 2022.
Beyond small molecules, we have also launched rigorous efforts to discover and advance various biotherapeutics that have the potential to become anti-cancer therapies, such as bispecific antibodies, ADCs and other innovative treatments. ADCs in particular present a unique opportunity for new cancer treatments, given their capabilities to deliver anti-cancer payload drugs to targets with increased precision while minimizing impact on healthy tissues, and have been validated by the multiple regulatory approvals for the commercial sale of ADCs in the past several years. To facilitate the growth of these programs, we have established multiple research collaborations and in-licensing arrangements and entered into other strategic transactions that provide us with access to antibodies or other binders, which are the starting point for use with additional technology platforms that we employ to generate next-generation ADCs or multispecific antibodies. We have already made significant progress under these arrangements and believe we will continue to do so in 2022 and future years. For example, based on promising preclinical data for XB002, Iconic’s lead TF-targeting ADC program, we exercised our exclusive option to license XB002 in December 2020 and initiated a phase 1 clinical trial in June 2021. We have expanded our access to antibodies through arrangements with WuXi Bio, focused on leveraging WuXi Bio’s panel of mAbs against an undisclosed target for the development of ADC, bispecific and certain other novel tumor-targeting biotherapeutics, and through the execution of an asset purchase agreement with GamaMabs, under which we will, upon the closing of the asset purchase and subject to certain conditions, acquire all rights, title and interest in GamaMabs’ antibody program directed at AMHR2. These antibodies, as well as those originating from our collaboration with Invenra, which was expanded in August 2021 to include an additional 20 oncology targets, provide starting points for the construction of ADCs through our collaborations with NBE and Catalent, utilizing their site-specific conjugation technologies and payloads. In addition, our collaboration with Adagene, focused on using Adagene’s SAFEbody technology to develop novel masked ADCs or other innovative biotherapeutics, provides potential for developing ADCs or other biotherapeutics with improved therapeutic index. As a direct result of these arrangements, we designated XB010, our first ADC advanced internally, as a development candidate in late 2021. XB010, which targets the tumor antigen 5T4, incorporates antibodies sourced from Invenra and was constructed using and Catalent’s SMARTag site-specific bioconjugation platform.
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For additional information on these early-stage trials of our small molecule and biotherapeutic product candidates, see “Business—Exelixis Development Programs—Other Development Programs - Advancing Exelixis’ Future Cancer Therapy Candidates” in Part I, Item 1 of this Annual Report on Form 10-K. For additional information on our specific research collaborations, in-licensing arrangements and other strategic transactions related to our small molecule and biotherapeutics programs, see “Business—Collaborations and Business Development Activities—Research Collaborations, In-licensing Arrangements and Other Business Development Activities” in Part I, Item 1 of this Annual Report on Form 10-K.
As of the date of this Annual Report, we are currently advancing more than 10 discovery projects.programs and expect to progress up to five new development candidates into preclinical development during 2022. In addition, we will continue to engage in business development initiatives with the goal of acquiring and in-licensing promising oncology platforms and assets and then further characterize and develop them utilizing our established preclinical and clinical development infrastructure.
COVID-19 Update
As of the date of this Annual Report on Form 10-K, the COVID-19 pandemic continues to have a modest impact on our business operations, in particular with respect to our clinical trial and commercial activities. We have and continue to undertake considerable efforts to mitigate the various problems presented by this crisis, including as described below:
Clinical Trials. To varying degrees and at different rates across our global clinical trials, we experienced declines in screening and enrollment activity during the early days of the COVID-19 pandemic, as well as delays in new site activations and restrictions on the access to treatment sites that is necessary to monitor clinical study progress and administration. However, we and our collaboration partners, including principal investigators and personnel at clinical trial sites, have been successful overall in preventing material delays to our ongoing and planned clinical trials due to the COVID-19 pandemic. We have done this through ongoing assessment of the COVID-19 pandemic’s impact, which has included staffing and materials shortages and other operational disruptions at clinical trial sites, and wherever possible, we take proactive steps in compliance with guidance issued by the FDA, EMA and other regulatory agencies to support the safety of our patients and their access to treatment, as well as to maintain the high quality of our clinical trials. We recognize, however, that we may have to make further operational adjustments to our ongoing and planned clinical trials and that patient enrollment, and new clinical trial site initiations may again be slowed due to recurring COVID-19 outbreaks and potential reintroduction of certain restrictions intended to mitigate the spread of COVID-19.
Drug Discovery and Preclinical Development. We have fully resumed drug discovery in our laboratories following a temporary suspension of these activities while we observed the shelter in place orders issued by the State of California and Alameda County. While this temporary suspension combined with interruptions in the portion of drug discovery work outsourced to third-party contractors in regions first impacted by COVID-19 caused us to experience modest delays in the advancement of certain of our early-stage programs, we continued to substantially progress our product pipeline despite the COVID-19 pandemic, including the submission of INDs for XB002, XL102 and XL114.
Commercial Activities. Despite the challenges posed by the COVID-19 pandemic, including requiring us to temporarily shift to telephonic and virtual interactions with healthcare professionals, we believe our commercial business was only modestly impacted. Our field employees have now partially resumed their in-person promotional activities while supplementing these activities with telephonic and virtual interactions and we believe they are well-positioned to execute on our commercial objectives.
Supply Chain. We have not experienced significant production delays or seen any significant impairment to our supply chain as a result of the COVID-19 pandemic. In addition, we continue to maintain sufficient safety stock inventories for our commercial drug substance and drug products. We continue to work closely with our third-party contract manufacturers, distributors, suppliers, comparator drug sourcing vendors and collaboration partners to safeguard both the timely production and delivery of our products.
General Business Operations. We have taken numerous precautions, some temporary and others still in place, to help mitigate the risk of transmission of the virus in the workplace, including: initially reducing the number of our employees working on-site at our Alameda headquarters; implementing a vaccination mandate and maintaining enhanced safety and social distancing protocols for those employees who have returned to working on-site, as well as initiating an on-site COVID-19 testing program and limiting certain non-essential business travel for our employees. While most of our employees worked remotely during much of 2020 and early 2021, our Alameda-based workforce has largely returned to working on-site at our headquarters consistent with the policies in place
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prior to the COVID-19 pandemic. As of the date of this Annual Report on Form 10-K, the COVID-19 pandemic has only had a modest impact on our productivity and has not caused significant interruptions in our general business operations. For a discussion of workplace safety measures we have taken as a result of the COVID-19 pandemic, see “Business—Environmental, Health and Safety—Workplace Safety Measures in Response to COVID-19” in Part I, Item 1 of this Annual Report on Form 10-K.
The circumstances and public health requirements surrounding the COVID-19 pandemic continue to be subject to rapid change, and we will continue to monitor new developments that could pose additional risks for us, including the spread of the Delta and Omicron variants in the U.S. and other countries and the potential emergence of other SARS-CoV-2 variants that may prove especially contagious or virulent. Despite our mitigation efforts, we may experience delays or an inability to execute on our clinical and preclinical development plans, reduced revenues or other adverse impacts to our business, which are described in more detail in “Risk Factors” in Part I, Item 1A of this Annual Report on Form 10-K. We recognize that this pandemic will continue to present unique challenges for us throughout 2022, and potentially into 2023.
For additional information regarding our business, see “Business” in Part I, Item 1 of this Annual Report on Form 10-K.


20182021 Business Updates and Financial Highlights
During 2018,2021, we continued to execute on our commercial, development and financialbusiness objectives, generating significant revenuerevenues from operations and enabling the businessus to continue to seek to maximize the clinical and commercial potential of our CABOMETYX and our other internally discovered, commercially available products and to expand theour product pipeline. Significant business updates and financial highlights for 20182021 and subsequent to year endyear-end include:
Business Updates
In January 2021, the FDA approved the combination of CABOMETYX and June 2018,OPDIVO as a first-line treatment of patients with advanced RCC, and we commenced the commercial launch of the combination upon such approval.
In January 2021, we announced amendments to the protocol for COSMIC-021, theinitiation of a phase 1b1 clinical trial of cabozantinibevaluating XL102, both as a single agent and in combination with atezolizumabother anti-cancer therapies in patients with inoperable, locally advanced or metastatic solid tumors.
In February 2021, we announced a collaboration and license agreement with Adagene to utilize Adagene’s SAFEbody technology platform to generate masked versions of mAbs from our growing preclinical pipeline for the development of ADCs or other innovative biotherapeutics.
In February 2021, cabozantinib was the subject of multiple data presentations in forms of RCC and other genitourinary cancers at the virtual 2021 ASCO Genitourinary Cancers Symposium.
In March 2021, we announced an exclusive license agreement with WuXi Bio for a panel of mAbs, which were discovered based on WuXi Bio’s integrated technology platforms for the development of ADC, bispecific and certain other novel tumor-targeting biotherapeutic applications.
In March 2021, we announced a clinical trial collaboration and supply agreement with Merck KGaA and Pfizer to evaluate XL092 in combination with avelumab in patients with locally advanced or metastatic solid tumors, to add new expansion cohorts toUC as part of the trial (for an aggregate of eighteen cohorts), which now includes patients with RCC, UC, NSCLC, CRPC, HCC, TNBC, EOC, endometrial cancer, gastric or gastroesophageal junction adenocarcinoma, colorectal adenocarcinoma, DTC and head and neck cancer of squamous cell histology.ongoing STELLAR-001 phase 1b dose escalation study.
In January 2018, we entered into an exclusive collaboration and license agreement with StemSynergy for the discovery and development of novel oncology compounds aimed to inhibit tumor growth by targeting CK1α.
In February 2018,March 2021, we announced updated results from the NCI-CTEP-sponsoredcompletion of enrollment for COSMIC-313, a phase 13 pivotal trial evaluating the triplet combination of cabozantinib, innivolumab and ipilimumab versus the combination withof nivolumab with or withoutand ipilimumab in patients with refractory genitourinary tumors. The updatedpreviously untreated advanced intermediate- or poor-risk RCC. We expect to report top-line results demonstrated an acceptable tolerability profile and high rates of durable responsesthe event-driven analyses from the trial in the previously treated metastatic UCfirst half of 2022.
In March 2021 and metastatic RCC cohorts.
In April 2018, we appointed Maria C. Freire, Ph.D. to our Board of Directors. Dr. Freire serves as President2021, Ipsen and Executive Director and as a member of the board of directors of the Foundation for the National Institutes of Health, an independent 501(c)(3) charitable organization established by Congress to support the National Institutes of Health by raising private funds for biomedical research and fostering partnerships and alliances around the world.
In May 2018, we entered into a collaboration and license agreement with Invenra to discover and develop multispecific antibodies for the treatment of cancer.
In May 2018, IpsenBMS, respectively, received regulatory approval from the EC for CABOMETYX in combination with OPDIVO as a first-line treatment for adult patients with previously untreated, intermediate- or poor-risk advanced RCC. The EC’s
In April 2021, we announced the FDA’s acceptance of the IND for XB002 and initiated a phase 1 trial evaluating the ADC in patients with advanced solid tumors in June 2021.
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In May 2021, we announced an asset purchase agreement with GamaMabs to acquire GamaMabs’ antibody program directed at AMHR2.
In June 2021, cabozantinib was the subject of multiple data presentations in forms of RCC and DTC at the 2021 ASCO Annual Meeting.
In June 2021, we filed a patent lawsuit against Teva, following receipt of two Paragraph IV certification notice letters from Teva informing us that it had filed an ANDA with the FDA requesting approval to market a generic version of CABOMETYX was basedtablets. For a more detailed discussion of this litigation matter, see “Legal Proceedings” in Part I, Item 3 of this Annual Report on Form 10-K.
In June 2021, we announced results from CABOSUN, a randomizedthe phase 23 COSMIC-312 trial, comparingin which the combination of cabozantinib with sunitiniband atezolizumab met one of the primary endpoints, demonstrating significant improvement in PFS versus sorafenib in patients with previously untreated advanced RCC with intermediate- or poor-risk disease that demonstratedHCC at the planned primary analysis. The interim OS analysis performed at the same time as the primary analysis for PFS did not demonstrate a statistically significant benefit for the combination. Detailed results from COSMIC-312 were later presented at the ESMO Asia Virtual Oncology Week in November 2021. The trial is continuing as planned to the final analysis of OS, anticipated during the first quarter of 2022, and clinically meaningful improvement in PFS and ORR versus sunitinib.we intend to submit an sNDA to the FDA for the combination regimen if supported by the final OS analysis.
In May 2018,August 2021, we announced that IMblaze370, Genentech’s phase 3 pivotal trial evaluating the combinationexpansion of cobimetinibour discovery and licensing collaboration with atezolizumab in patients with CRC, did not meet its primary endpoint. However, Genentech continuesInvenra to pursueinclude an additional 20 oncology targets for multispecific antibody, ADC and other biotherapeutics candidate discovery and development.
In August 2021, Takeda and Ono received regulatory approval from the cobimetinib development program, either as a single-agent orJapanese MHLW to manufacture and market CABOMETYX in combination studies.
In June 2018, clinical data from cabozantinib were the subject of fifteen presentations at the ASCO 2018 Annual Meeting, including a poster presentation covering a sub-group analysis of CELESTIAL, our phase 3 pivotal trial evaluating cabozantinib in patients with previously treated HCC, comparing outcomes by duration of sorafenib treatment in patients whose only prior treatment was sorafenib and outcomes based on age. The findings showed that cabozantinib improved OS and PFS compared with placebo irrespective of duration of prior sorafenib treatment or age category.
In July 2018, we were added to Standard & Poor’s (S&P’s) MidCap 400 index and are classified under S&P’s Global Industry Classification Standard Biotechnology Sub-Industry index.
In July 2018, the NEJM published results from CELESTIAL, our phase 3 pivotal trial evaluating cabozantinib in patients with previously treated HCC. The data demonstrate that cabozantinib provided a statistically significant and clinically meaningful improvement in OS versus placebo.
In September 2018, NCCN updated its Clinical Practice Guidelines to include favorable new recommendations for CABOMETYXOPDIVO as a treatment for patients with advanced RCC, regardless of patient risk status. As part of this update, NCCN also designated CABOMETYX as the only preferred TKI treatment option for previously untreated patients with poor-unresectable or intermediate-risk, and the only preferred TKI treatment option for previously treated patients.metastatic RCC.
In September 2018, Ipsen received regulatory approval from Health Canada2021, the FDA approved CABOMETYX for CABOMETYX as athe treatment in Canada forof adult and pediatric patients with advanced RCC who have received prior VEGF-targeted therapy. Health Canada’s approval of CABOMETYX was based on results from METEOR, our phase 3 trial in which CABOMETYX provided

a statistically significant12 and clinically meaningful improvement in OS, PFS and ORR as compared with everolimus in patients with advanced RCC who have received prior anti-angiogenic therapy.
In October 2018, we initiated COSMIC-311, a phase 3 pivotal trial evaluating cabozantinib in patients with RAI-refractory DTC who have progressed after up to two VEGFR-targeted therapies. This trial was informed by cabozantinib’s encouraging clinical activity in patients with RAI-refractory DTC in phase 1 and 2 studies for which updated data was presented at the 2018 Multidisciplinary Head and Neck Cancers Symposium in February 2018.
In October 2018, clinical data from cabozantinib were the subject of thirteen presentations at ESMO, including a poster presentation covering the results from the dose escalation stage of COSMIC-021, our phase 1b study evaluating the safety and tolerability of cabozantinib in combination with Roche’s atezolizumab in patientsolder with locally advanced or metastatic solid tumors. Findings fromDTC that has progressed following prior VEGF receptor-targeted therapy and who are RAI-refractory or ineligible, and we commenced the dose escalation phasecommercial launch of the trial demonstrate that the combination was well-tolerated and showed encouraging anti-tumor activityCABOMETYX in patients with advanced RCC. this indication upon such approval.
In another poster presentation, data were presented from an analysis that evaluated the effect of PD-L1 expression on clinical outcomes with cabozantinib in advanced RCC from the CABOSUN and METEOR trials. This analysis showed that cabozantinib’s activity was independent of PD-L1 expression. Additionally, a separate retrospective analysis of RCC patients found thatSeptember 2021, cabozantinib was active following prior treatment with immune checkpoint inhibitor therapy either alone orthe subject of multiple data presentations in combination with VEGF-targeted or other prior therapy.
In October 2018, Ipsen received approvals from both the Agência Nacional de Vigilância Sanitária in Brazil for CABOMETYX as a treatment for both previously treated and previously untreated advanced RCC, previously treated RAI-refractory DTC and frommCRPC at the Taiwan FoodESMO 2021 Congress.
In October 2021, we announced an exclusive collaboration and Drug Administrationlicense agreement with STORM to discover and develop inhibitors of novel RNA modifying enzymes, including ADAR1.
In October 2021, we and Aurigene announced that we exercised our exclusive option for CABOMETYXXL114, Aurigene’s novel anti-cancer compound that inhibits the CBM complex, resulting in our assuming responsibility for all subsequent clinical development, manufacturing and commercialization of XL114. Following the FDA’s acceptance of the IND for XL114 in October 2021, we plan to initiate a phase 1 clinical trial evaluating XL114 as a treatment for patients with advanced RCC who have received prior anti-angiogenic therapy.
In November 2018, Ipsen received regulatory approval from the EC for CABOMETYX as a treatment for HCC in adults who have previously been treated with sorafenib. The EC’s approval of CABOMETYX was based on results from CELESTIAL, our phase 3 pivotal trial evaluating cabozantinibmonotherapy in patients with previously treated HCC, which demonstrated a statistically significant and clinically meaningful improvementNHL in OS versus placebo.the first half of 2022
In December 2018,November 2021, we initiated COSMIC-312,announced the completion of enrollment for CONTACT-01, a phase 3 pivotal trial evaluating cabozantinib in combination with atezolizumab versus sorafenibdocetaxel in patients with previously untreated advanced HCC. We are sponsoring COSMIC-312, and Ipsen will co-fund the trial. Ipsen will have access to the results to support potential future regulatory submissions outside of the U.S. and Japan. Roche is providing atezolizumab free of charge.
In January 2019, we announced that our partner Daiichi Sankyo received approval from the MHLW for MINNEBRO as a treatment for patients with hypertension in Japan. MINNEBRO is a compound identified during our research collaboration with Daiichi Sankyo, which the companies entered into in March 2006, and has been subsequently developed by Daiichi Sankyo.
In January 2019, the FDA approved CABOMETYX as a treatment for patients with HCCmetastatic NSCLC who have been previously treated with sorafenib. The FDA’s approvalan ICI and platinum-containing chemotherapy. Based on current event rates, we anticipate announcing results of CABOMETYX was based on results from CELESTIAL,the interim OS analysis in the second half of 2022.
In December 2021, we announced the initiation of STELLAR-002, a phase 1b clinical trial evaluating XL092 in combination with either nivolumab, nivolumab and ipilimumab, or nivolumab and bempegaldesleukin in patients with advanced solid tumors. Previously in June 2021, we announced a clinical trial collaboration and supply agreement with BMS pursuant to which BMS is providing nivolumab, ipilimumab and bempegaldesleukin for use in the trial.
In December 2021, we appointed Jacqueline Wright to our Board of Directors. Ms. Wright currently serves as Corporate Vice President & Chief Digital Officer, U.S. Business at Microsoft Corporation.
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In January 2022, we appointed Vicki L. Goodman, M.D., as Executive Vice President, Product Development & Medical Affairs, and Chief Medical Officer. Dr. Goodman had previously served as Vice President, Clinical Research and Therapeutic Area Head, Late Stage Oncology at Merck & Co.
In January 2022, we announced the completion of enrollment for CONTACT-03, a phase 3 pivotal trial evaluating the efficacy and safety of cabozantinib in combination with atezolizumab versus cabozantinib alone in patients with locally advanced or metastatic RCC who progressed during or following treatment with an ICI as the immediate preceding therapy. Based on current event rates, we anticipate announcing results of PFS and the first interim OS analysis in the second half of 2022.
In January 2022, we announced an amendment to our exclusive option and license agreement with Iconic to acquire broad rights to use the anti-TF antibody incorporated into XB002 for any application, including conjugated to other payloads, as well as rights within oncology to a number of other anti-TF antibodies developed by Iconic, including for use in ADCs and multispecific biotherapeutics.
In January 2022, we presented encouraging data from two early-stage studies evaluating cabozantinib in combination with ICIs in patients with previously treated HCC, which demonstrated a statistically significantCRC at the 2022 ASCO Gastrointestinal Cancers Symposium: cohort 16 from COSMIC-021, evaluating cabozantinib in combination with atezolizumab in patients with metastatic CRC who were previously treated with fluoropyrimidine-containing chemotherapy; and clinically meaningful improvementcohort 2 from CAMILLA, the phase 2 IST evaluating cabozantinib in OS versus placebo.
In January 2019, the FDA accepted our IND for XL092, a next-generation oral TKI and the first compound to advance from our new discovery organization. The phase 1 dose escalation trial will evaluate its pharmacokinetics, safety and tolerabilitycombination with durvalumab in patients with advanced solid tumors, withmismatch repair proficient/micro satellite stable CRC patients who were chemotherapy-refractory.
In February 2022, cabozantinib will be the primary objectivesubject of determining a dose for daily oral administrationmultiple data presentations in forms of XL092 suitable for further evaluation.RCC and other genitourinary cancers at the 2022 ASCO Genitourinary Cancers Symposium.
20182021 Financial Highlights
Net income for 2018 was $690.1 million, or $2.32 per share, basic and $2.21 per share, diluted, compared to $154.2 million, or $0.52 per share, basic and $0.49 per share diluted, for 2017.
Total revenues for 2018 increased to $853.8 million, compared to $452.5 million for 2017.
Net product revenues for 2018 increased to $619.32021 were $1,077.3 million,, compared to $349.0$741.6 million for 2017.
2020.
Total revenues for 2021 were $1,435.0 million, compared to $987.5 million for 2020.
Research and development expenses for 2018 increased to $182.32021 were $693.7 million,, compared to $112.2$547.9 million for 2017.
2020.
Selling, general and administrative expenses for 2018 increased to $206.42021 were $401.7 million,, compared to $159.4$293.4 million for 2017.
2020.
Provision for income taxes for 2021 was $63.1 million, compared to $19.1 million for 2020.

Net income for 2021 was $231.1 million, or $0.73 per share, basic and $0.72 per share, diluted, compared to $111.8 million, or $0.36 per share, basic and $0.35 per share diluted, for 2020.
Cash and investments increased to $851.6 million$1.9 billion at December 31, 2018,2021, compared to $457.2 million$1.5 billion at December 31, 2017.
2020.
During the second quarter of 2018, Ipsen reached $150.0 million in cumulative net sales of cabozantinib, which resulted in an increase in the minimum royalty rate earned by us to 22% of net sales by Ipsen. Previously we had been entitled to receive a tiered royalty of 2% to 12%. Since reaching that milestone, we are entitled to receive a tiered royalty of 22% to 26% of annual net sales.
During the fourth quarter of 2018, we released substantially all of our valuation allowance against our deferred tax assets which resulted in a $244.1 million income tax benefit.
See “Results of Operations” below for a discussion of the detailed components and analysis of the amounts above.
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Outlook, Challenges and Risks
We will continue to face a number of challenges and risks to our business that may impact our ability to execute on our 20192022 business objectives.objectives, and some of these risks to our business have been or may be exacerbated by the COVID-19 pandemic. In particular, we anticipate that for the foreseeable future, we expect our ability to maintain or meaningfully increase unrestrictedgenerate sufficient cash flow to fund our commercialbusiness operations and our development and discovery programsgrowth will be dependentdepend upon the continued successful commercializationcommercial success of CABOMETYX, both alone and in combination with other therapies, as a treatment for the treatment of RCC and HCC, in each case in territories wherehighly competitive indications for which it has beenis approved, and according to the terms of such regulatory approvals, and in potentialpossibly for other indications for which cabozantinib has been or is currently being evaluated in potentially label-enabling clinical trials, if warranted by the data generated from these trials. However, we cannot be certain that the clinical trials we and our collaboration partners are conducting will demonstrate adequate safety and efficacy in late-stage development, such as previously treated RAI-refractory DTC. Thethese additional indications to receive regulatory approval in the major commercial opportunity for CABOMETYX as a treatment of RCC and HCC remains subject to a variety of factors, most importantly, CABOMETYX’s perceived benefit/risk profile as compared to the benefit/risk profiles of other treatments available or currently in development for the treatment of these conditions. Our ability to maintain or meaningfully increase product revenues frommarkets where CABOMETYX is also affected by a number of other factors, includingapproved. Even if we and our collaboration partners receive the highly competitive marketsrequired regulatory approvals to market cabozantinib for whichadditional indications, we intendand our collaboration partners may not be able to pursue regulatory approval of cabozantinibcommercialize CABOMETYX effectively and successfully in these additional indications. In addition, CABOMETYX will only continue to be commercially successful if private third-party and government payers continue to provide coverage and reimbursement. However, as is the prospectcase for new competitiveall innovative pharmaceutical therapies, obtaining and generic competition, and the extent to whichmaintaining coverage and reimbursement for CABOMETYX is available from governmentbecoming increasingly difficult, both within the U.S. and other third-party payers. Obtaining and maintaining appropriate coverage and reimbursement for CABOMETYX is increasingly challenging due to, among other things, the focusin foreign markets, because of growing concerns over healthcare cost containment and other potential austerity measures being discussed incorresponding policy initiatives and activities aimed at expanding access to, and restricting the U.S. and worldwide, as well as increasing interest amongst legislators and policymakers in the U.S. in restricting drug prices through the imposition of, pharmaceutical drug price controls. Our ability to fulfill the commercial potential of cabozantinib also depends on whether data generated by our clinical development activities will support regulatory approval of cabozantinib in additional indications. pharmaceuticals.
Achievement of our 20192022 business objectives will also depend on our ability to maintain a competitive position with respect to the shifting landscape of therapeutic strategy for the treatment of cancer, which we may not be able to do. While we have had success in adapting our development strategy for the cabozantinib franchise and other product candidates to address the competitive landscape, including through evaluation of therapies that combine ICIs with other targeted agents, it is uncertain whether current and future clinical trials will lead to regulatory approvals, or whether physicians will prescribe regimens containing our products instead of competing product combinations in approved indications. Moreover, the complexities of this development strategy have required and are likely to continue to require collaboration with some of our developmentcompetitors. In the longer term, we may eventually face competition from potential manufacturers of generic versions of our marketed products, including the proposed generic versions of CABOMETYX tablets that are the subject of ANDAs submitted to the FDA by MSN and commercialization strategy formulated to navigate increased competition, including thatTeva, and the approval of either MSN’s or Teva’s ANDA could significantly decrease our revenues derived from but not limited to, ICIs, as well as the useU.S. sales of combination therapy to treat cancer. Furthermore,CABOMETYX and thereby materially harm our business, financial condition and results of operations. Separately, our research and development objectives may be impeded as we work to scaleby the challenges of scaling our organization to meet the demands of expanded drug development, unanticipated delays in clinical testing and the inherent risks and uncertainties associated with drug discovery activities.operations, all of which may be increased as a result of the COVID-19 pandemic. In connection with efforts to expand our product pipeline, we may be unsuccessful in discovering new drug candidates or we may not be able to successfully identifyidentifying appropriate candidates for in-licensing or acquisition.
Some of these challenges and risks are specific to our business, and others are common to companies in the pharmaceuticalbiopharmaceutical industry with development and commercial operations. As described under “—COVID-19 Update” above, these risks have been or may be exacerbated by the COVID-19 pandemic. For a completemore detailed discussion of challenges and risks we face, including those relating to the COVID-19 pandemic, see “Risk Factors” in Part I, Item 1A of this Annual Report on Form 10-K.

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Results of Operations
We have adopted a 52- or 53-week fiscal year policy that ends on the Friday closest to December 31st. Fiscal 2021, which was a52-week fiscal year, ended December 31, 2021 and fiscal year 2020, which was a 52-week fiscal year, ended January 1, 2021. For convenience, references in this report as of and for the fiscal year ended January 1, 2021 are indicated as being as of and for the year ended December 31, 2020.
This discussion and analysis generally addresses 2021 and 2020 items and year-over-year comparisons between 2021 and 2020. Discussions of 2019 items and year-over-year comparisons between 2020 and 2019 that are not included in this Annual Report on Form 10-K can be found in “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations” in our Annual Report on Form 10-K for the fiscal year ended December 31, 2020, submitted to the U.S. Securities and Exchange Commission (SEC) on February 10, 2021.
Revenues
Revenues by category were as follows (dollars in thousands):
 Year Ended December 31, 
 Percentage Change -
2018 v. 2017
 
 Percentage Change -
2017 v. 2016
 2018 2017 2016  
Net product revenues$619,279
 $349,008
 135,375
 77% 158%
Collaboration revenues234,547
 103,469
 56,079
 127% 85%
Total revenues$853,826
 $452,477
 $191,454
 89% 136%
Collaboration revenues for the year ended December 31, 2018 were impacted by our adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). For additional information on our adoption of Topic 606, see “Note 1. Organization and Summary of Significant Accounting Policies—Recently Adopted

Accounting Pronouncements,” “Note 2. Revenues” and “Note 3. Collaboration Agreements” in our “Notes to Consolidated Financial Statements” contained in Part II, Item 8 of this Annual Report on Form 10-K.
 Year Ended December 31,Percent Change
 20212020
Net product revenues$1,077,256 $741,550 45 %
License revenues249,956 167,295 49 %
Collaboration services revenues107,758 78,693 37 %
Total revenues$1,434,970 $987,538 45 %
Net Product Revenues
Gross product revenues, discounts and allowances, and net product revenues were as follows (dollars in thousands):
 Year Ended December 31,Percent Change
 20212020
Gross product revenues$1,452,913 $962,591 51 %
Discounts and allowances(375,657)(221,041)70 %
Net product revenues$1,077,256 $741,550 45 %
Net product revenues by product were as follows (dollars in thousands):
Year Ended December 31,  Percentage Change -
2018 v. 2017
  Percentage Change -
2017 v. 2016
Year Ended December 31,Percent Change
2018 2017 2016  20212020
CABOMETYX$599,946
 $324,000
 $93,481
 85 % 247 %CABOMETYX$1,054,050 $718,687 47 %
COMETRIQ19,333
 25,008
 41,894
 (23)% (40)%COMETRIQ23,206 22,863 %
Net product revenues$619,279
 $349,008
 $135,375
 77 % 158 %Net product revenues$1,077,256 $741,550 45 %
The increasesincrease in net product revenues for CABOMETYX for the year ended December 31, 2018,2021, as compared to 2017 and 2016, were primarily due2020, was related to a 72%42% increase in the number of CABOMETYX units sold that was primarily driven by the strong uptake for the combination therapy of CABOMETYX and 228%OPDIVO following approval by the FDA in January 2021, and to a lesser extent a 3% increase respectively,in the average net selling price of CABOMETYX.
We project our fiscal 2022 net product revenues will increase over fiscal 2021, primarily as a result of the growth in the number of units of CABOMETYX sold and, to a lesser extent, increases infollowing the average selling price of the product. The increases in CABOMETYX sales volumes reflects the continued growthFDA’s approval of CABOMETYX in advanced RCC following regulatory approvals of CABOMETYX for thecombination with OPDIVO as a first line treatment of patients with advanced RCC, who have received prior anti-angiogenic therapy in April 2016 and for previously untreated patients with advanced RCC in December 2017. The decreases in net product revenues for COMETRIQ for the year ended December 31, 2018, as compared to 2017 and 2016, were primarilypart due to a 26%the longer duration of therapy for this combination, as well as an increase in selling price reflecting the continued evolution of the metastatic RCC, HCC and 53% decline, respectively, in the number of units of COMETRIQ sold. COMETRIQ sales volume has continued to decrease since the launch of CABOMETYX in April 2016. The adoption of Topic 606 did not impact our net product revenues.DTC treatment landscapes.
We recognize product revenues net of discounts and allowances that are described in “Note 1. Organization and Summary of Significant Accounting Policies” to our “Notes to Consolidated Financial Statements” containedincluded in Part II, Item 8
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of this Annual Report on Form 10-K. Discounts and allowances as a percentage of gross revenue have increased over time as the number of patients participating in government programs has increased and as the discounts given and rebates paid to government payers have also increased. The increase in the reserve balances for discounts and allowances fromfor the year ended December 31, 20172021, as compared to December 31, 20182020, was primarily the result of an increase in product sales volume,Public Health Service hospital utilization and the dollar amount of the related chargebacks, and to a lesser extent, higher discounts and participation in government programs, and an increase in commercial contracting. The increase in the reserve balances for discounts and allowances from December 31, 2016 to December 31, 2017 was the result of an increase in product sales volume, and to a lesser extent, additional reserves for goods in the channel expected to have higher discounts during early 2018, as well as a higher volume in government programs. Those increases were partially offset by payments, the issuance of customer creditsMedicaid utilization and the prior period adjustments for chargebacks and certaindollar amount of the related Medicaid rebates.
We expectproject our discounts and allowances as a percentage of gross product revenues tomay increase during 2019 as our business evolves and the number of patients participating in government programs increases, the discounts and rebates paid to government payers increase and as a result of the engagement in commercial contracting that may result in additional discounts or rebates.fiscal 2022, for similar reasons noted above.
CollaborationLicense Revenues
CollaborationLicense revenues were as follows (dollars in thousands):
 Year Ended December 31,  Percentage Change -
2018 v. 2017
  Percentage Change -
2017 v. 2016
 2018 2017 2016  
Collaboration revenues:      

  
License revenues (1)
$192,188
 $96,637
 $56,286
 99% 72%
Research and development service revenues (2)
39,501
 8,737
 
 352% n/m
Other collaboration revenues (3)
2,858
 (1,905) (207) n/m
 820%
Total collaboration revenues$234,547
 $103,469
 $56,079
 127% 85%
____________________
(1)Upon the adoption of Topic 606 as of January 1, 2018, the allocation of proceeds from our collaboration partners, including upfront and milestone payments, between intellectual property licenses and research and development services as well as the resulting timing of recognition have changed. License revenues for the year ended December 31, 2018 included the immediate recognition of the portion of milestones that were allocated to the transfer of intellectual property licenses for those milestones for which it had become probable that a significant revenue reversal would not occur, as well as royalty revenues from Ipsen and Genentech. License revenues for the years ended December 31, 2017 and 2016 included the full recognition of substantive
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milestones achieved during the period, recognition of deferred revenues from upfront payments and a non-substantive milestone, which were being amortized over various periods, as well as royalty revenues from Ipsen and Genentech.
(2)Research and development service revenues for the year ended December 31, 2018 included the recognition of deferred revenue for the portion of the upfront and milestone payments that have been allocated to the research and development service performance obligations which are being amortized through early 2030, as well as development cost reimbursements earned on our collaboration agreements. As described above, prior to the adoption of Topic 606, we did not allocate any of our upfront payments or milestones to research and development services; therefore, Research and development service revenues for the years ended December 31, 2017 included only development cost reimbursements earned on our collaboration agreements.
(3)Other collaboration revenues for the year ended December 31, 2018 included royalties we paid to GSK on Ipsen’s sales of products containing cabozantinib, the profit on the U.S. commercialization of COTELLIC from Genentech and product supply revenues. Other collaboration revenues for the years ended years ended December 31, 2017 and 2016 included only royalties we paid to pay GSK on Ipsen’s sales of products containing cabozantinib and product supply revenues, as the profits and losses on the U.S. commercialization of COTELLIC for the period were included in Selling, general and administrative expenses.
Collaboration revenues were $234.5 million, $103.5 million and $56.1 million for the years ended December 31, 2018, 2017 and 2016, respectively. The increases in collaboration revenues were primarily the result of increases in milestones revenues, royalties under our collaboration agreement with Ipsen, development cost reimbursement revenues and profit sharing under our collaboration agreement with Genentech; those increases were partially offset by decreases ininclude: (a) the recognition of deferred revenue duethe portion of milestone payments allocated to the adoptiontransfer of Topic 606 and increasesintellectual property licenses for which it had become probable in the royalties we paid to GSK on Ipsen’s sales of products containing cabozantinib.
Milestone revenues were $164.4 million, $57.5 million and $40.0 million forrelated period that the years ended December 31, 2018, 2017 and 2016, respectively. Milestone revenues related primarily to development, regulatory and commercial achievements under our collaboration agreement with Ipsen. Under our Ipsen collaboration, during the year ended December 31, 2018, we recognized three developmental and regulatory milestones totaling $115.0 millionmilestone would be achieved and a commercial milestone for $25.0 million, as compared to two developmentalsignificant reversal of revenues would not occur in future periods; (b) royalty revenues and regulatory milestones totaling $40.0 million during 2017. (c) the profit on the U.S. commercialization of COTELLIC from Genentech.

See “Note 3. Collaboration Agreements”Collaborations and Business Development Activities—Cabozantinib Commercial Collaborations—Performance Obligations and Transaction Prices for our Ipsen and Takeda Collaborations” in ourthe “Notes to Consolidated Financial Statements”Statements—Performance Obligations and Transaction Prices for our Ipsen and Takeda Collaborations contained in Part II, Item 8 of this Annual Report on Form 10-K for additional information abouta discussion on the timingallocation of transaction price which impacts the proportion of milestone revenues allocated to license revenues and amounts of revenue associated withcollaboration services revenues.
Milestone revenues, which are allocated between license revenues and collaboration services revenues, were $133.8 million for the year ended December 31, 2021, as compared to $86.5 million for 2020.
Milestone revenues for the year ended December 31, 2021 included: (1) $100.0 million related to a commercial sales milestone from Ipsen upon their achievement of these milestones. $400.0 million of net sales of cabozantinib in the related Ipsen license territory over four consecutive quarters, (2) $11.9 million related to a $12.5 million regulatory milestone Ipsen achieved upon submission of a variation application to the EMA for CABOMETYX as a treatment for patients with previously treated, RAI-refractory DTC and (3) $18.9 million in connection with a $20.0 million milestone achieved following Takeda’s first commercial sale in Japan of CABOMETYX in combination with OPDIVO for the treatment of patients with curatively unresectable or metastatic RCC;
Milestone revenues for the year ended December 31, 2020 included: (1) $25.7 million in connection with a $31.0 million milestone achieved upon Takeda’s first commercial sale of CABOMETYX for the treatment of patients with curatively unresectable or metastatic RCC in Japan; (2) $19.0 million in connection with a $20.0 million development milestone from Ipsen for the initiation of a phase 3 pivotal trial; (3) $9.3 million in connection with a $10.0 million milestone for Takeda’s and Ono’s submission of a supplemental application to the Japanese MHLW for Manufacturing and Marketing Approval of CABOMETYX in combination with OPDIVO for the treatment of patients with unresectable, advanced or metastatic RCC; (4) $14.0 million in connection with a $15.0 million milestone achieved upon Takeda’s first commercial sale of CABOMETYX for the treatment of patients with advanced HCC; and (5) $14.0 million in connection with $15.0 million in milestones from Takeda for the initiation of two phase 3 pivotal clinical trials that were deemed probable of being achieved in 2021.
Due to uncertainties surrounding the timing and achievement of development, regulatory and developmentcommercial milestones, it is difficult to predict the timing of future milestone revenues and such milestones canrevenues; consequently, milestones may vary significantly from yearperiod to year.period.
Royalties onRoyalty revenues increased primarily as a result of an increase in Ipsen’s net sales of cabozantinib by Ipsen outside of the U.S. and JapanJapan. Ipsen royalty revenues were $32.3 million, $3.8 million and $0.2$97.2 million for the yearsyear ended December 31, 2018, 2017 and 2016, respectively.2021, as compared to $76.2 million for 2020. Ipsen’s net sales of cabozantinib have continued to grow since their first commercial sale of the product in the fourth quarter of 2016, primarily due to increased demand and approvals of CABOMETYX in additional indications and/or jurisdictions outside of the U.S. We were initially entitled to receive a tiered royalty of 2% to 12% on the initial $150.0 million of net sales; this amount was reached in the second quarter of 2018. As of December 31, 2018 and going forward, we are entitled to receive a tiered royalty of 22% to 26% on annual net sales (with separate tiers for Canada); these 22% to 26% royalty tiers reset each calendar year. In Canada, we are entitled to receive a tiered royalty of 22% on the first CAD$30.0 million of annual net sales and a tiered royalty thereafter to 26% on annual net sales; these 22% to 26% royalty tiers for Canada will also reset each calendar year. For 2019, we expect the royalty revenues to increase as a result of achievingincreased demand of CABOMETYX, due to regulatory approval in new territories, including the 22% minimum royalty tier.
Development cost reimbursementsmore recent regulatory approval in connection with our collaboration arrangements with Ipsen and Takeda were $24.9 million and $8.7 millionthe EU for the years ended December 31, 2018combination therapy of CABOMETYX and 2017, respectively. The increaseOPDIVO received in March 2021. Royalty revenues for the year ended December 31, 2018, was primarily2021 also included $7.9 million, as compared to $2.3 million for 2020, related to Takeda’s net sales of CABOMETYX, which have continued to grow since their first commercial sale of product in Japan in 2020. Additionally, Takeda royalty revenues have increased due to the resultAugust 2021 regulatory approval in Japan for the combination therapy of Ipsen’sCABOMETYX and Takeda’s participation in the CheckMate 9ER study. There were no such development cost reimbursements during the year endedOPDIVO. As of December 31, 2016.2021, CABOMETYX is approved and commercially available in 61 countries outside of the U.S.
Profits
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Our share of profits on the U.S. commercialization of COTELLIC and royalties on ex-U.S. net sales of COTELLIC under our collaboration agreement with Genentech totaled $13.6was $8.1 million for the year ended December 31, 2018. During the years ended December 31, 2017 and 2016 collaboration2021, as compared to $6.3 million for 2020. We also earned royalty revenues included royalties on ex-U.S. net sales of COTELLIC by Genentech of $6.4$4.1 million and $2.8 million, respectively. Profits and losses on the U.S. commercialization of COTELLIC for the yearsyear ended December 31, 2017 and 2016 were included in Selling, general and administrative expenses. We achieved a profit on the U.S. commercialization of COTELLIC in 2018,2021, as compared to $5.1 million for 2020.
We project our license revenues may decrease in fiscal 2022, as compared to fiscal 2021, as a lossresult of the anticipated achievement of fewer milestones in 2017, as Genentech scaled back the personal promotion of COTELLIC resulting2022, partially offset by an increase in a reduction in commercial expenditures whileroyalty revenues from the sale of COTELLIC remained relatively flat.
Revenues from the amortization of deferred revenue related to an increase in product sales by Ipsen and Takeda.
Collaboration Services Revenues
Collaboration services revenues include the recognition of adeferred revenues for the portion of upfront and milestone payments that have been allocated to research and development services performance obligations, development cost reimbursements earned under our collaboration agreements, and product supply revenues, which are net of product supply costs and the upfront payments received in connection with our February 2016 collaboration agreement withroyalties we pay to Royalty Pharma on sales by Ipsen and the upfront paymentTakeda of products containing cabozantinib.
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received in connection with our January 2017 collaboration agreement with Takeda. Such revenuesDevelopment cost reimbursements were $4.5 million, $28.9 million and $13.3$116.8 million for the yearsyear ended December 31, 2018, 20172021, as compared to $76.3 million for 2020. The increase in development cost reimbursement was primarily attributable to Ipsen’s decision to opt in and 2016, respectively. The decreaseco-fund COSMIC-311 development costs in the recognitionsecond quarter of such2021. Ipsen is now responsible for 35% of the global development costs of COSMIC-311 and is obligated to reimburse us for these costs, as well as an additional payment calculated as a percentage of COSMIC-311 development costs, triggered by the timing of the exercise of its option.
Accordingly, collaboration services revenues for the year ended December 31, 2018, as compared to 2017 was2021, includes a resultcumulative catch-up of $43.2 million recognized in the second quarter of 2021 for Ipsen’s share of global development costs incurred since the beginning of the adoption of Topic 606; Upon adopting Topic 606 on January 1, 2018, we recorded a $236.7 million reduction of the unrecognized upfront and non-substantive milestone payments previously received from our collaboration partners that had been included in deferred revenue at December 31, 2017 along with a corresponding reduction of our opening accumulated deficit. For the year ended December 31, 2017, we recognized $18.5 million and $10.4 million of such revenue in connection with the Ipsen collaboration agreement and the Takeda collaboration agreement, respectively. For the year ended December 31, 2016, we recognized $13.3 million of such revenue in connection with the Ipsen collaboration agreement. No such revenue was recognized in connection with the Takeda collaboration agreement during 2016.study. The increase in such revenuesdevelopment cost reimbursements for the year ended December 31, 2017, as compared to 2016, is due to2021 was partially offset by a decrease in total spending for the timing of the execution of those agreements.COSMIC-312 and COSMIC-021 studies.
For the years ended December 31, 2018, 2017 and 2016, collaborationCollaboration services revenues were reduced by $5.4$14.3 million $2.0 million and $0.2 million, respectively, forwith respect to the 3% royalty we are required to pay GSK on the net sales by Ipsen and Takeda of any product incorporating cabozantinib.cabozantinib for the year ended December 31, 2021, as compared to $10.6 million for 2020. As royalty generating sales of cabozantinib by Ipsen and Takeda have increased as described above, our royalty payments to GSK have also increased.
We project our collaboration services revenues may decrease in fiscal 2022, as compared to fiscal 2021, primarily as a result of decreased development cost reimbursements related to Ipsen’s opt in and co-funding of COSMIC-311 and the related cumulative catch-up in development cost reimbursements recognized in fiscal 2021 for which no similar event is projected to occur in 2022.
Cost of Goods Sold
The Costcost of goods sold and our gross margins were as follows (dollars in thousands):
Year Ended December 31,  Percentage Change -
2018 v. 2017
  Percentage Change -
2017 v. 2016
Year Ended December 31,Percent Change
2018 2017 2016  20212020
Cost of goods sold$26,348
 $15,066
 $6,552
 75% 130%Cost of goods sold$52,873 $36,272 46 %
Gross margin96% 96% 95%    
Gross margin %Gross margin %95 %95 %
Cost of goods sold is related to our product revenues and consists primarily of a 3% royalty we are required to pay GSKpayable on U.S. net sales by us of any product incorporating cabozantinib, indirect labor costs,as well as the cost of manufacturing the product,inventory sold, indirect labor costs, write-downs related to expiring, excess and excessobsolete inventory, and other third-party logistics costs. Portions of the manufacturing costs for inventory were incurred prior to the regulatory approval of CABOMETYX and COMETRIQ and, therefore, were expensed as research and development costs when incurred, rather than capitalized as inventory. Cost of goods sold included a 2%, 3% and 7% reduction related to materials that had been previously expensed during the years ended December 31, 2018, 2017 and 2016, respectively. There were no amounts remaining related to previously expensed materialsThe increase in our inventory balances as of December 31, 2018. Write-downs related to excess and expiring inventory were $1.1 million, $1.1 million and $0.5 million for the years ended December 31, 2018, 2017 and 2016, respectively.
The increases in Costcost of goods sold for the year ended December 31, 2018,2021, as compared to 2017, were primarily related to2020, was the growthresult of increases in royalty payments as a result of increased U.S. CABOMETYX sales of CABOMETYX. The increase in Cost of goods sold for the year ended December 31, 2017, as compared to 2016, primarily reflects the growth in product sales of CABOMETYX following the product’s launch in late April 2016 and an increase in market share.
certain other period costs. We do not expectproject our fiscal 2022 gross margin to change significantly during the year ending December 31, 2019.remain consistent with fiscal 2021.
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Research and Development Expenses
Research and development expenses were as follows (dollars in thousands):
 Year Ended December 31,  Percentage Change -
2018 v. 2017
  Percentage Change -
2017 v. 2016
 2018 2017 2016  
Research and development expenses$182,257
 $112,171
 $95,967
 62% 17%
Research and development expenses consist primarily of clinical trial costs, personnel expenses, consulting and outside services, stock-based compensation, the allocation of general corporate costs and license costs.
The increase in Research and development expenses for the year ended December 31, 2018, as compared to 2017, were primarily related to increases in clinical trial costs, personnel expenses, license costs and stock-based compensation. Clinical trial costs, which includes services performed by third-party contract research organizations and other vendors who support our clinical trials, increased $26.1 million for the year ended December 31, 2018, as compared to 2017. The
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increase in clinical trial costs was primarily due to increased costs associated with: CheckMate 9ER, COSMIC-311, COSMIC-312 and the preparation for further pivotal phase 3 trials that are expected to be initiated in 2019. Personnel expenses increased $21.5 million for the year ended December 31, 2018, as compared to 2017, primarily due to an increase in headcount to support our development and discovery efforts. License costs increased $8.2 million for the year ended December 31, 2018, as compared to 2017, primarily as a result of our entry into the collaboration agreements with Invenra and StemSynergy. Stock-based compensation increased $5.5 million for the year ended December 31, 2018, as compared to 2017, primarily due to an increase in headcount.
The increase in Research and development expenses for the year ended December 31, 2017, as compared to 2016, was primarily related to an increase in personnel expenses and clinical trial costs. Personnel expenses increased $8.5 million for the year ended December 31, 2017, as compared to 2016, primarily due to support for our development efforts and our medical affairs organization. Clinical trial costs increased $4.4 million for the year ended December 31, 2017, as compared to 2016 primarily due to start-up costs associated with CheckMate 9ER and COSMIC-021, partially offset by decreases in costs related to METEOR.
We do not track fully-burdened Researchfully burdened research and development expenses on a project-by-project basis. We group our Researchresearch and development expenses into three categories: Development, Drug discovery(1) development; (2) drug discovery; and Other.(3) other. Our development group leads the development and implementation of our clinical and regulatory strategies and prioritizes disease indications in which our compounds are being or may be studied in clinical trials. Our drug discovery group utilizes a variety of technologies, including in-licensed technologies, to enable the rapid discovery, optimization and extensive characterization of lead compounds and biotherapeutics such that we are able to select development candidates with the best potential for further evaluation and advancement into clinical development.
Research and development expenses by category were as follows (in(dollars in thousands):
Year Ended December 31,Year Ended December 31,Percent Change
2018 2017 2016 20212020
Research and development expenses:     Research and development expenses:
Development:     Development:
Clinical trial costs$66,434
 $40,315
 $35,947
Clinical trial costs$225,018 $248,684 -10 %
Personnel expenses48,114
 30,076
 22,936
Personnel expenses112,083 85,900 30 %
Licenses and other collaboration costs(1)
Licenses and other collaboration costs(1)
38,500 — N/A
Consulting and outside services9,693
 8,492
 8,176
Consulting and outside services25,463 16,975 50 %
Other development costs(2)13,505
 12,967
 11,478
26,429 22,421 18 %
Total development137,746
 91,850
 78,537
Total development427,493 373,980 14 %
Drug discovery (1)
21,944
 6,334
 1,220
Other (2)
22,567
 13,987
 16,210
Drug discovery:Drug discovery:
License and other collaboration costs(1)
License and other collaboration costs(1)
137,568 96,437 43 %
Other drug discovery (2)
Other drug discovery (2)
49,760 30,253 64 %
Total drug discoveryTotal drug discovery187,328 126,690 48 %
Stock-based compensationStock-based compensation46,654 37,198 25 %
Other research and development(3)
Other research and development(3)
32,241 9,983 223 %
Total research and development expenses$182,257
 $112,171
 $95,967
Total research and development expenses$693,716 $547,851 27 %
____________________
(1)Primarily includes personnel expenses, consulting and outside services and laboratory supplies for all periods presented and license costs for our collaboration and license agreements with Invenra and StemSynergy during the year ended December 31, 2018.
(2)Includes stock-based compensation and the allocation of general corporate costs to research and development.
(1)    License and other collaboration costs presented in total development includes upfront license fees and development milestone payments associated with programs currently in clinical development stage while license and other collaboration costs presented in total drug discovery includes upfront license fees, development milestone payments, program initiation fees, and research funding commitments associated with programs in preclinical development stage.
(2)    Primarily includes personnel expenses, consulting and outside services and laboratory supplies, if not separately presented.
(3)    Includes the allocation of general corporate costs to research and development services, and development cost reimbursements in connection with our collaboration arrangement with Roche executed in December 2019.

The increase in research and development expenses for the year ended December 31, 2021, as compared to 2020, was primarily related to increases in license and other collaboration costs, personnel expenses, stock-based compensation and other research and development costs, partially offset by a decrease in clinical trial costs. Drug discovery related license and other collaboration costs increased primarily due to increases in upfront license fees, including, in connection with our recent amended agreement with Iconic in the fourth quarter of 2021 for rights to additional compounds, and other increases in program initiation fees, development milestones, and research funding commitments related to business development activities. Development related license and other collaboration costs increased primarily due to our recent amended agreement with Iconic to buyout future contingent milestone payments and a development milestone we deemed probable of achievement under certain of our in-licensing collaboration arrangements. Personnel expenses increased primarily due to an increase in headcount to support our expanding discovery and development organization. Stock-based compensation expense increased primarily due to an increase related to service-based RSUs associated with higher headcount. Other research and development costs increased primarily related to technology services and related investments in support of digital transformation initiatives and an increase in allocated corporate costs, which were
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partially offset by development cost reimbursements in connection with our collaboration arrangement with Roche. Clinical trial costs decreased primarily due to lower costs associated with the COSMIC-312 and COSMIC-021 studies.
In addition to reviewing the three categories of Researchresearch and development expenses described above, we principally consider qualitative factors in making decisions regarding our research and development programs. SuchThese factors include enrollment in clinical trials for our drug candidates, preliminary data from and final results offrom clinical trials, the potential indications for our drug candidates, the clinical and commercial potential for our drug candidates, and competitive dynamics. We also make our research and development decisions in the context of our overall business strategy.
We are focusing a significant amount of our development efforts primarily on cabozantinib to maximize the therapeutic and commercial potential of this compound and, as a result, we expectproject that a substantial portion of our near-term research and development expenses to primarilywill relate to the continuing clinical development program of cabozantinib. We expect to continue to incur significant development costs for cabozantinib, in future periods as we evaluate its potential in a broad development program comprisingwhich includes over 75100 ongoing or planned clinical trials across multiple indications. Notable ongoing company-sponsored studies ofresulting from this program include: CheckMate 9ERCOSMIC-313, for which BMS is providing nivolumab and CheckMate 040, each in collaboration with BMS; company-sponsored COSMIC-021ipilimumab free of charge and COSMIC-312,CONTACT-02 for which Roche is sharing the development costs and providing atezolizumab free of charge; and company-sponsored COSMIC-311. In addition, post-marketing commitments in connection with the approval of COMETRIQ in progressive, metastatic MTC dictate that we conduct an additional study in that indication.
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charge.
We are also committedworking to buildingexpand our oncology product pipeline by discoveringthrough drug discovery efforts, which encompass our diverse small molecule and developing new cancer therapies for patients.biotherapeutics programs exploring multiple modalities and mechanisms of action. In this regard, we have reinitiated internalconduct drug discovery effortsactivities with the goal of identifying new product candidates to advance into clinical trials. These internal drug discovery activities are augmented by effortsIn addition, we will continue to identifyengage in business development initiatives with the goal of acquiring and in-licensein-licensing promising early-stage oncology platforms and assets and then further characterize and develop them utilizing our established preclinical and clinical development infrastructure. As a result, for 2019 we expect
We project our Researchresearch and development expenses may increase in fiscal 2022 as compared to increase as we continue to expandfiscal 2021, driven by our ongoing clinical evaluation of cabozantinib, the cabozantinibinitiation of new clinical trials and expansion of ongoing clinical trials evaluating other product candidates in our pipeline, including ongoing and planned early-stage trials evaluating XL092, XB002, XL102 and XL114, and anticipated business development program and our product pipeline.activities.
The length of time required for clinical development of a particular product candidate and our development costs for that product candidate may be impacted by the scope and timing of enrollment in clinical trials for the product candidate, our decisions to develop a product candidate for additional indications and whether we pursue development of the product candidate or a particular indication with a collaborator or independently. For example, cabozantinib is being developed in multiple indications, and we do not yet know for how many of those indications we will ultimately pursue regulatory approval. In this regard, our decisions to pursue regulatory approval of cabozantinib for additional indications depend on several variables outside of our control, including the strength of the data generated in our prior, ongoing and potential future clinical trials. Furthermore, the scope and number of clinical trials required to obtain regulatory approval for each pursued indication is subject to the input of the applicable regulatory authorities, and we have not yet sought such input for all potential indications that we may elect to pursue. Even after having given such input, applicable regulatory authorities may subsequently require additional clinical studies prior to granting regulatory approval based on new data generated by us or other companies, or for other reasons outside of our control. As a condition to any regulatory approval, we may also be subject to post-marketing development commitments, including additional clinical trial requirements. As a result of the uncertainties discussed above, we are unable to determine the duration of, or completetotal costs associated with the development of cabozantinib or any of our other research and development projects.
In any event, ourOur potential therapeutic products are subject to a lengthy and uncertain regulatory process that may not result in our receipt of the necessary regulatory approvals. Failure to receive the necessary regulatory approvals would prevent us from commercializing the product candidates affected, including cabozantinib in any additional indications. In addition, clinical trials of our potential product candidates may fail to demonstrate safety and efficacy, which could prevent or significantly delay regulatory approval. A discussion of the risks and uncertainties with respect to our research and development activities, including completing the development of our product candidates, and the consequences to our business, financial position and growth prospects can be found in “Risk Factors” in Part I, Item 1A of this Annual Report on Form 10-K.
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Selling, General and Administrative Expenses
Selling, general and administrative expenses were as follows (dollars in thousands):
 Year Ended December 31,Percent Change
 20212020
Selling, general and administrative expenses (1)
$328,549 $225,483 46 %
Stock-based compensation73,166 67,872 %
Total Selling, general and administrative expenses$401,715 $293,355 37 %
 Year Ended December 31,  Percentage Change -
2018 v. 2017
  Percentage Change -
2017 v. 2016
 2018 2017 2016  
Selling, general and administrative expenses$206,366
 $159,362
 $116,145
 29% 37%
____________________
(1)    Excludes stock-based compensation allocated to selling, general and administrative expenses.
Selling, general and administrative expenses consist primarily of personnel expenses, consulting and outside services, stock-based compensation, marketing costs and corporate giving.certain other administrative costs.
The increasesincrease in Selling,selling, general and administrative expenses for the year ended December 31, 2018,2021, as compared to 2017, were2020, was primarily related to increases in personnel expenses, consulting and outside services, stock-based compensation,marketing costs, legal costs, corporate giving and marketing costs.technology services. Personnel expenses increased $14.7 million for the year ended December 31, 2018, as compared to 2017, primarily due to increasesan increase in general and administrative headcount to support our commercial and research and development organizations. Consulting and outside services and marketingMarketing costs increased $11.7 millionprimarily to support the launch of the combination therapy of CABOMETYX and $6.1 million, respectively,OPDIVO for the year ended December 31, 2018 as comparedtreatment of advanced RCC following approval by the FDA in January 2021. The increase in technology services relates to 2017, primarily due to increases in marketing activities in connection with preparations for the CABOMETYX launch in HCC, which were partially offset by a $2.1 million decrease in the losses on the U.S. commercialization of COTELLIC. For the year ended December 31, 2017, such losses on the U.S. commercialization of COTELLIC were included in Selling,our digital transformation initiatives.
We project our selling, general and administrative expenses whereas for the year ended December 31, 2018, the profit on the U.S. commercialization of COTELLIC was includedmay increase in Collaboration revenues. Stock-based compensation increased $11.1 million for the year ended December 31, 2018,fiscal 2022, as compared to 2017, primarily due to increasesfiscal 2021 in headcount. Corporate giving, consisting predominantly of donations to independent patient support foundations, increased $6.4 million for the year ended December 31, 2018, as compared to 2017.
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The increase in Selling, general and administrative expenses for the year ended December 31, 2017, as compared to 2016, was primarily related to increases in personnel expenses, consulting and outside services, marketing costs and charitable contribution expenses. Personnel expenses increased $11.3 million for the year ended December 31, 2017, as compared to 2016, primarily due to an increase in general and administrative headcount to support our commercial and research and development organizations. Consulting and outside services increased $10.7 million for the year ended December 31, 2017, as compared to 2016, primarily due to increases in consulting for marketing activities. Marketing costs increased $6.6 million for the year ended December 31, 2017, as compared to 2016, primarily due to an increase in losses recognized under our collaboration agreement with Genentech. In December 2016, Genentech stated that it changed, both retroactively and prospectively, the manner in which it allocates promotional expenses of the COTELLIC plus Zelboraf combination therapy. As a result of Genentech’s decision to change its cost allocation approach, we were relieved of our obligation to pay certain disputed costs that had been accrued by us; we were also able to invoice Genentech for certain expenses, with interest, that we had previously paid. Accordingly, duringcontinued commercial investment in CABOMETYX and the year ended December 31, 2016, we offset Selling, general and administrative expenses with a $13.3 million recovery of disputed losses that we had recognized and recorded prior to 2016. Marketing costs also included a loss of $2.1 million for activities during the year ended December 31, 2017 under our collaboration agreement with Genentech, as compared to a loss of $4.5 million for activities during 2016. Corporate giving increased $5.2 million for the year ended December 31, 2017, as compared to 2016.
For 2019, we expect modest growth in Selling, general and administrative expenses in 2019 to support our overall organizational growth.the broader organization.
OtherNon-Operating Income (Expenses), Net
OtherNon-operating income (expenses), net, werewas as follows (dollars in thousands):
 Year Ended December 31,  Percentage Change -
2018 v. 2017
  Percentage Change -
2017 v. 2016
 2018 2017 2016  
Interest income$12,840
 $4,883
 $2,578
 163 % 89 %
Interest expense
 (8,679) (33,060) (100)% (74)%
Other, net397
 (3,537) (11,616) n/m
 (70)%
Total other income (expenses), net$13,237
 $(7,333) $(42,098) n/m
 (83)%
 Year Ended December 31,Percent Change
 20212020
Interest income$7,672 $19,865 -61 %
Other income (expense), net(184)912 N/A
Non-operating income$7,488 $20,777 -64 %
The increasesdecrease in Interestnon-operating income for the year ended December 31, 2018,2021, as compared to 2017 and 2016, respectively, were2020, was primarily the result of both anlower interest income due to lower interest rates.
Provision for Income Taxes
The provision for income taxes and the effective tax rates were as follows (dollars in thousands):
 Year Ended December 31,Percent Change
 20212020
Provision for income taxes$63,091 $19,056 231 %
Effective tax rate21.4 %14.6 %47 %
The increase in our investment balances and an increase in the yield earned on those investments.
The decreases in Interest expenseprovision for income taxes for the year ended December 31, 2018,2021, as compared to 2017 and 2016, were2020, was primarily due to the repayment of the Secured Convertible Notes due 2018 held by entities associated with Deerfield Management Company, L.P. (Deerfield Notes),increase in June 2017, the repayment of the our $80.0 million term loan with Silicon Valley Bank in March 2017, and the conversions and the redemption of the 4.25% convertible senior subordinated notes due 2019 (2019 Notes), during the third and fourth quarters of 2016.
The changes in Other, netpre-tax income. The effective tax rate for the year ended December 31, 2018, as compared to 2017 and 2016, were2021 differed from the U.S. federal statutory rate of 21% primarily due to a loss on extinguishment of debt and gains on the sale of other equity investments that both occurred in 2017 and 2016. During the years ended December 31, 2017 and 2016 we recognized a $6.2 million and $13.9 million loss on extinguishment of debt, respectively, due to the repayment of the Deerfield Notes in June 2017 and the conversions and the redemption of the 2019 Notes during the third and fourth quarters of 2016. There was no such retirement of debt during the year ended December 31, 2018. Other, net also included gains of $0.2 million, $3.0 million and $2.5 million, respectively, during the years ended December 31, 2018, 2017 and 2016, respectively,non-deductible executive compensation, partially offset by excess tax benefits related to the August 2016 saleexercise of our 9% interest in Akarna Therapeutics, Ltd. (Akarna) to Allergan Holdco UK Limited (Allergan). We acquired our interest in Akarna in 2015 in exchange for intellectual property rights related tocertain stock options during the Exelixis discovered compound XL335. We are eligible to earn additional such gains inperiod and the future as Allergan continues its developmentgeneration of XL335.
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Income Tax Benefit (Provision)
federal tax credits. The incomeeffective tax benefit (provision) were as follows (in thousands): 
 Year Ended December 31,
 2018 2017 2016
Income tax benefit (provision)$237,978
 $(4,350) $
The income taxes benefitrate for the year ended December 31, 2018 included a $244.1 million benefit2020 differed from the U.S. federal statutory rate of 21% primarily due to excess tax benefits related to the releaseexercise of substantially all of our valuation allowance against our deferred tax assets. The decision to release the valuation allowance was made after we determined that it was more likely than not that these deferred tax assets, including net operating lossescertain stock options and federal tax credits, would be realized, and was based onoffset by non-deductible executive compensation during the evaluation and weighting of both positive and negative evidence, includingperiod. We project that our achievement of a cumulative three-year income position as of December 31, 2018 and forecasts of future operating results, as well as considering the utilization of net operating losses and tax credits prior to their expiration. Due to the release of the valuation allowance in 2018, starting in 2019, we expect to record a provision for income taxes on our pretax income using an estimated effective tax rate between 21% and 23%.
Other than the benefit we recorded for the release of our valuation allowance during the year ended 2018, the provision for income taxes for the years ended December 31, 2018 and 2017 primarily related to taxes in states for which we do not have net operating loss carryforwards due to a limited operating history. Our historical losses were sufficient to fully offset our federal taxable income for the years ended December 31, 2018 and 2017.
Impact of Duration of Fiscal Years
We have adopted a 52- or 53-week fiscal year policy that generally ends on the Friday closest to December 31st. 2019 will be a 53-week fiscal year as compared to 52-week fiscal years for 2018, 2017between 20% and 2016. Accordingly, the 53-week fiscal year22% in 2019 may result in a modest increase in revenues and expenses, as compared to 2018, 2017 and 2016.2022.
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Liquidity and Capital Resources
As of December 31, 2018,2021, we had $851.6 million$1.9 billion in cash and investments, which included $850.5 million available for operations.compared to $1.5 billion as of December 31, 2020. We anticipate that the aggregate of our current cash and cash equivalents, short-term and long-term investments available for operations, net product revenues and collaboration revenues will enable us to maintain our short-term operations and execute our long-term plans.
Our primary cash requirements for a period of at least 12 months following the filing date of this report. The sufficiency of our cash resources depends on numerous assumptions, including assumptionsoperating activities, which we project will increase in 2022 as compared to 2021, are for employee related expenditures; costs related to our development programs including payments to third party contract research organizations that conduct and manage global clinical trials; drug discovery programs, including payments made to collaboration partners for in-licensing arrangements for upfront and option exercise fees, research and development funding, and development, regulatory and commercial milestones; royalties paid on our net product sales; and cost of inventory and our leased facilities. Our primary source of operating cash is cash collections from customers related to net product sales which we project will increase in 2022 compared to 2021 and operating expenses,cash collections from our commercial collaboration arrangements with Ipsen, Takeda and others related to royalties earned, the achievement of certain development, regulatory and commercial milestones as well as the other factors set forth in “Risk Factors”cash payments to us for cost reimbursements under the headings “Risks Related tocertain of our Capital Requirements, Accounting and Financial Results,” in Part I, Item 1A of this Annual Report on Form 10-K. Our assumptions may prove to be wrong or other factors may adversely affect our sourcesdevelopment programs. The timing of cash generated from commercial collaborations and as a resultrequired for in-licensing collaborations related to upfront payments, initiation fees, milestone payments and cost reimbursements may vary from period to period.
We also have cash requirements related to capital expenditures to support the planned growth of our business including investments in laboratory facilities and equipment. We project that we may not have the cash resources to fund our operations as currently planned, which would have a material adverse effect on our business.
We expect to continue to spend significant amounts of cash to fund the continued development and commercialization of cabozantinib. In addition, we intend to rebuildcontinue to expand our oncology product pipeline through our reinitiated drug discovery efforts, including additional research collaborations, in-licensing arrangements and the execution ofother strategic transactions that align with our oncology drug development, and regulatory and commercial expertise. Financing these activities could materially impact our liquidity and capital resources and may require us to incur debt or raise additional funds through the issuance of equity. Furthermore, even ifthough we believe we have sufficient funds for our current and future operating plans, we may choose to incur debt or raise additional funds through the issuance of equity due tobased on market conditions or strategic considerations.
Letters of Credit
We have obtained standby letters of credit related to our lease obligations and certain other obligations with combined credit limits of $16.7 million and $1.6 million as of December 31, 2021 and 2020, respectively.
In January 2021, we entered into a standby letter of credit as guarantee of our obligation to fund our portion of the tenant improvements related to our build-to-suit lease at our corporate campus. The letter of credit is secured by our short-term investments, which are recorded as restricted cash equivalents and presented in other long-term assets in our Consolidated Balance Sheets and will be reduced as we fund our portion of the tenant improvements. As of December 31, 2021, restricted cash equivalents included $15.2 million of short-term investments as collateral under our standby letter of credit for our portion of the tenant improvements.

Sources and Uses of Cash(dollars in thousands):
 December 31,Percent Change
 20212020
Working capital$1,497,157 $1,240,737 21 %
Cash, cash equivalents, restricted cash equivalents and investments$1,854,908 $1,538,842 21 %

Working capital:The following table summarizesincrease in working capital as of December 31, 2021, as compared to December 31, 2020, was primarily due to an increase in net product revenues and collaboration revenues, including a $100.0 million milestone from Ipsen, and proceeds received from issuing common stock under our employee equity incentive plans. These increases were partially offset by the reclassification of certain investments from short-term to other long-term assets related to the standby letter of credit noted above, cash used for capital expenditures incurred in connection with expanding our laboratory facilities and acquiring related equipment, cash paid for tax withholding on equity awards, and a net increase in
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operating liabilities, including a $55.0 million collaboration liability related to the Iconic amended agreement. In the future, our working capital may be impacted by some or all of these factors, the amounts and timing of which are variable.
Cash, cash equivalents, restricted cash equivalent and investments:Cash and cash equivalents primarily consist of cash deposits held at major banks, commercial paper and other securities with original maturities 90 days or less. Restricted cash equivalents and investments relate to our letter of credit agreements and are invested in short-term marketable securities. For additional information regarding our cash, cash equivalents, restricted cash equivalents and investments, see “Note 4. Cash and Investments,” in our “Notes to Consolidated Financial Statements” contained in Part II, Item 8 of this Annual Report on Form 10-K. The increase in cash, cash equivalents, restricted cash equivalent and investments at December 31, 2021, as compared to December 31, 2020, was primarily due to cash inflows generated by our operations, including collections of amounts due from customers, partially offset by operating cash payments for employee related expenditures, our development and discovery programs, and capital expenditures.
Cash flow activities were as follows (in thousands):
 Year Ended December 31,
 2018 2017 2016
Net cash provided by operating activities$415,720
 $165,611
 $210,404
Net cash (used in) provided by investing activities$(297,850) $36,795
 $(214,548)
Net cash provided by (used in) financing activities$9,691
 $(169,928) $15,696
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 Year Ended December 31,
 20212020
Net cash provided by operating activities$400,804 $208,982 
Net cash used in investing activities$(42,884)$(131,215)
Net cash used in financing activities$(14,801)$(25,132)
Operating Activities
Our primary source of operating cash flows is cash collections from customers related to our net product sales and cash collections from our commercial collaboration arrangements. Our primary uses of cash from operating activities provided cash of $415.7 millionare for the year ended December 31, 2018, compared to $165.6 million during 2017 and $210.4 million during 2016.
Cash flows provided by operating activities represent the cash receipts and disbursementsemployee related costs, costs related to all of our activities other than investingdevelopment and financing activities. discovery programs, cash payments for inventory, royalties paid on our net product sales, and our leased facilities.
Cash provided by operating activities is derived by adjusting our net income for:for non-cash operating items such as deferred taxes, stock-based compensation, depreciation, and amortization, share-based compensation charges and the release of our valuation allowance against our deferred tax assets;non-cash lease expense, and 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 our Consolidated ResultsStatements of Operations.Income.
The most significant factors that contributed to the increase inNet cash provided by operating activities increased for the year ended December 31, 2018,2021, as compared to 2017, was a $270.3 million increase in net product revenues and $42.5 million2020, primarily due to an increase in cash received for milestones. These wereon sales of our products, an increase in cash received from our commercial collaboration arrangements and net favorable changes in operating assets and liabilities, partially offset by a $128.4 millionan increase in cash paid for operating expensesexpenses.
Investing Activities
The changes in cash flows from investing activities primarily relates to the timing of marketable securities investment activity and capital expenditures. Our capital expenditures primarily consist of investments to expand our operations and acquire assets that further our research and development.
Net cash used in investing activities decreased for the year ended December 31, 2018,2021 as compared to 2017,2020 primarily due to a net increase in cash proceeds from maturities and sales of investments, net of investment purchases partially offset by the impactan increase in capital expenditures. In 2021, capital expenditures primarily consisted of the upfront nonrefundable paymentinvestments in leasehold improvements and equipment related to an expansion of $50.0 million received from Takeda in 2017 in consideration for the exclusive licenselaboratory facilities at our corporate campus and other rights contained intechnology infrastructure investments to support our collaboration agreement with Takeda.digital transformation initiatives.
Financing Activities
The most significant factors that contributed to the decreasechanges in cash provided by operatingflows from financing activities primarily relate to proceeds from employee stock programs and taxes paid related to net share settlement of equity awards.
Net cash used in financing activities decreased for the year ended December 31, 2017,2021, as compared to 2016, include2020 primarily as a result of lower withholding taxes remitted to the upfront nonrefundable payment of $200.0 million received from Ipsen in 2016 in consideration for the exclusive license and other rights contained in our collaboration agreement with Ipsen along with a $67.0 million increase in operating expenses. These were offset by a $213.6 million increase in net product revenues and the upfront nonrefundable payment of $50.0 million received from Takeda in the year ended December 31, 2017 in consideration for the exclusive license and other rights contained in our collaboration agreement with Takeda.
Investing Activities
Our investing activities used cash of $297.9 million for the year ended December 31, 2018, as compared to $36.8 million of cash provided during 2017 and $214.5 million of cash used during 2016.
Cash used in investing activities for the year ended December 31, 2018 was primarily due to investment purchases of $557.8 million and Property and equipment purchases of $33.3 million, primarilygovernment related to our new corporate headquartersnet share settlements of equity awards and research facilitiesto a lesser extent a decrease in Alameda, California, offset by cash provided from the maturity and sale of investments of $280.8 million and $11.9 million, respectively.
Cash provided by investing activities for the year ended December 31, 2017 was primarily due to cashproceeds received from the sale and maturity of investments of $373.9 million, offset by cash used for investment purchases of $319.1 million. During 2017 we also invested $21.1 million in property and equipment.
Cash used by investing activities for the year ended December 31, 2016 was primarily due to investment purchases of $369.2 million, offset by cash provided by the maturity and sale of investments of $153.8 million.
Financing Activities
Our financing activities provided cash of $9.7 million for the year ended December 31, 2018, as compared to $169.9 million of cash used during 2017 and $15.7 million of cash provided during 2016.
Cash provided by financing activities for the year ended December 31, 2018 was primarily the result of $9.7 million in proceeds from the issuance of common stock under our equity incentive plans, net of taxes paid related to net share settlements.
Cash used in financing activities for the year ended December 31, 2017 was primarily the result of $185.8 million paid for all amounts outstanding under the Deerfield Notes and our term loan with Silicon Valley Bank. Those payments were partially offset by $15.9 million of proceeds from the issuance of common stock under our equity incentive plans, net of taxes paid related to net share settlements.
Cash provided by financing activities for the year ended December 31, 2016 was primarily the result of $23.4 million of proceeds from the issuance of common stock under our equity incentive plans, net of taxes paid related to netpurchase plans.
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share settlements. Those proceeds were partially offset by cash payments from the conversion and redemption of the 2019 Notes totaling $7.7 million.
Contractual Obligations
We have contractual obligations inAs of December 31, 2021, we anticipate the formaggregate of leasesour cash, cash equivalents and purchase obligations. The following chart detailsshort-term investments and cash generated from operations to be sufficient to fund our contractual obligations, as well as cash requirements to support our ongoing operations and capital expenditures. Our contractual obligations as of December 31, 2018 (in thousands):2021 primarily consist of:
Operating leases: We have certain lease agreements related to our corporate campus facilities, under which we are obligated to make minimum lease payments. As of December 31, 2021, we had $11.4 million of minimum lease payments due in one year and $289.1 million due over the remaining lease term. We entered into the build-to-suit lease agreement in October 2019, the term of the lease is for a period of 242 months, which is expected to begin in the first quarter of 2022. The amounts presented herein include the estimated lease commitment payments at the estimated commencement of the lease, subject to adjustment dependent upon the actual total development costs of the premises.
  Payments Due by Period
Contractual Obligations (1)
 Total 
Less than
1 year
 
1-3
Years
 
More than 3
Years
Operating leases 28,187
 2,794
 5,727
 19,666
Purchase and other long-term obligations (2)
 27,143
 24,067
 2,908
 168
Total contractual cash obligations $55,330
 $26,861
 $8,635
 $19,834
Purchase obligations: Purchase obligations include firm purchase commitments related to manufacturing of inventory, software services and other facilities and equipment. As of December 31, 2021, we had $40.0 million total purchase obligations due within one year and $10.6 million due after one year.
____________________
(1)In addition to the above, we have committed to make potential future milestone payments to Invenra or StemSynergyContingent payments: We have committed to make certain contingent payments for potential future milestones, research funding commitments and royalties to certain collaboration partners as part of our collaboration agreements with those parties. Payments under those agreements generally become due and payable only upon achievement of certain developmental, regulatory and sales-based milestones. Because the achievement of those milestones is neither probable nor reasonably estimable, such contingencies have not been recorded on our Consolidated Balance Sheets and have not been included in the table above. For more information about these obligations, see “Note 3. Collaboration Agreements” in our “Notes to Consolidated Financial Statements” contained in Part II, Item 8 of this Annual Report on Form 10-K.
(2)Purchase obligations include firm purchase commitments related to manufacturing and maintenance of inventory, software services and other long term contractual obligations.
Off-Balance Sheet Arrangements
We do not expect these contingent payments to have a significant impact on our liquidity in the near term.
Notes 3 and 11 of “Notes to Consolidated Financial Statements” contained in Part II, Item 8 of this Annual Report on Form 10-K include additional information regarding our contractual obligations and contingencies.
As of December 31, 2021, we did not have any material off-balance-sheet arrangements, as defined by applicable SEC regulations.
Critical Accounting Policies and Estimates
The preparation of our Consolidated Financial Statements conforms to accounting principles generally accepted in the U.S. which requires management to make judgments, estimates and assumptions that affect the reported amounts of assets, liabilities, equity, revenues and expenses, and related disclosures. An accounting policy is considered to be critical if it requires an accounting estimate to be made based on assumptions about matters that are highly uncertain at the time the estimate is made, and if different estimates that reasonably could have been used, or changes in the accounting estimates that are reasonably likely to occur periodically, could materially impact our Consolidated Financial Statements. On an ongoing basis, management evaluates its estimates including, but not limited to: those related to revenue recognition, including determining the nature and timing of satisfaction of performance obligations, and determining the standalone selling price of performance obligations, and variable consideration such as rebates, chargebacks, sales returns and sales allowances as well as milestones included in collaboration arrangements; the amounts of revenues and expenses under our profit and loss sharing agreement; recoverability of inventory; operating lease assets and liabilities; the amounts of deferred tax assets and liabilities including the related valuation allowance; the accrual for certain liabilities including accrued clinical trial liabilities; and valuations of equity awards used to determine stock-based compensation, including certain awards with vesting subject to market or performance conditions.conditions; and the amounts of deferred tax assets and liabilities including the related valuation allowance. We base our estimates on historical experience and on various other market-specific and other relevant assumptions that we believe to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Our senior management has discussed the development, selection and disclosure of these estimates with the Audit Committee of our Board of Directors. Actual results could differ materially from those estimates.
We believe our critical accounting policies relating to revenue recognition, inventory, clinical trial accruals, stock option valuationstock-based compensation and income taxes reflect the more significant estimates and assumptions used in the preparation of our Consolidated Financial Statements.
For a complete description of our significant accounting policies, see “Note 1. Organization and Summary of Significant Accounting Policies” in the “Notes to Consolidated Financial Statements” contained in Part II, Item 8 of this Annual Report on Form 10-K.
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Revenue Recognition
Net Product Revenues and Discounts and Allowances
We recognize revenuerevenues when our customers obtain control of promised goods or services, in an amount that reflects the consideration to which we are entitled to in exchange for those goods or services. We calculate gross product revenues based on the price that we charge to the specialty pharmacies and distributors in the U.S. We estimate our domestic net product revenues by deducting from our gross product revenues: (a) trade allowances, such as discounts for prompt payment; (b) estimated government rebates and chargebacks; (c) certain other fees paid to specialty pharmacies, distributors and distributors;commercial payors; and (d) returns. Discounts and allowances are complex and require significant judgment by management. Estimates are assessed each period and updated to reflect current information.
We initially record estimates for these deductions at the time we recognize the related gross product revenue. OurWe base our estimates for the expected utilization are based on customer and payer data received from the specialty pharmacies and distributors and historical utilization rates as well as third-party market research data. For a further descriptionWe update our estimates every quarter to reflect actual claims and other current information. Actual rebates and chargebacks claimed for prior periods have varied from our estimates by less than 1% of our discountsthe amount deducted from gross product revenues for the years ended December 31, 2021 and allowances, see “Note 1. Organization and Summary of Significant Accounting Policies” to our “Notes to Consolidated Financial Statements” contained in Part II, Item 8 of this Annual Report on Form 10-K.2020. Our current estimates may differ significantly from actual results.
Collaboration Revenues
We enter into collaboration arrangements with third parties, under which we license certain rights to our intellectual property, to third parties.and account for the arrangements as either license revenue or collaboration services revenue when the counterparty is a customer. The terms of these arrangements typically include payment to us for one or more of the following: non-refundable, up-front license fees; development, regulatory and commercial milestone payments; product supply services; development cost reimbursements; profit sharing arrangements; and royalties on net sales of licensed products.
As part of the accounting for these arrangements, we must develop assumptions that require judgment to determine the standalone selling price for each performance obligation identified in the contract. We use key assumptions to determine the standalone selling price, which may include forecast revenues and costs, clinical development timelines and costs, reimbursement rates for personnel costs, discount rates and probabilities of technical and regulatory success. At the inception of each arrangement that includes development milestone payments, we evaluate whether the milestones are considered probable of being reached and estimate the amount to be included in the transaction price using the most likely amount method. At the end of each subsequent reporting period, we re-evaluate the probability of earning of such development milestones and any related constraint, and if necessary, adjust our estimate of the overall transaction price. For arrangements that may include sales-based royalties, including milestone payments based on the level of sales, and the license is deemed to be the predominant item to which the royalties relate, we recognize revenue at the later of (i) when the related sale occurs or (ii) when the performance obligation to which some or all of the royalty has been allocated has been satisfied (or partially satisfied). Development milestone adjustments are recorded on a cumulative catch-up basis, which would affect collaboration services revenues in the period of adjustment. In addition, in recording revenues for our research and development services performance obligation,obligations, we use internalprojected development projected cost estimates to determine the amount of revenue to record as we satisfy this performance obligation, known as the inputs method.
We record royalty revenues and U.S. profits and losses under the collaboration agreement with Genentech based on estimates of the sales that occurred during the period. The relevant period estimates of sales are based on interim data provided by licensees and analysis of historical activity, adjusted for any changes in facts and circumstances, as appropriate. We base our estimates on the best information available at the time provided to us by our collaboration partners. However, additional information may subsequently become available to us, which may allow us to make a more accurate estimate in future periods. In this event, we are required to record adjustments in future periods when the actual level of activity becomes more certain. Such increases or decreases are generally considered to be changes in estimates and will be reflected in our Consolidated Statements of Operations in the period they become known.obligation.
Inventory
We value inventory at the lower of cost or net realizable value. We determine the cost of inventory using the standard-cost method, which approximates actual cost based on a first-in, first-out method. We analyze our inventory levels quarterly and write down inventory subject to expiry in excess of expected requirements, or that has a cost basis in excess of its expected net realizable value. On a quarterly basis, we analyze our estimated production levels for the following twelve monthtwelve-month period, which is our normal operating cycle, and reclassify inventory we expect to use or sell in periods beyond the next twelve months into Otherother long-term assets in the Consolidated Balance Sheets.
Clinical Trial and Collaboration Accruals
AllWe execute all of our clinical trials have been executed with support from contract research organizations and other vendors. Wevendors and we accrue costs for clinical trial activities performed by contract research organizationsthese third parties based upon the estimated amount of work completed on each trial. For clinical trial expenses, the significant factors used in estimating accruals include the
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number of patients enrolled, the activities to be performed for each patient, the number of active clinical sites and the duration for which the patients will be enrolled in the trial. Certain of our in-licensing collaboration arrangements includes contingent
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considerations in the form of development, regulatory and commercial milestones payments. We recognize the contingent considerations when they are deemed probable of achievement which requires judgment as to the probability and timing of the achievement of the underlying milestones. We monitor patient enrollment levels and assess the related research and development activities progress, including the probability of achieving milestones payments associated to the respective terms and conditions of our in-licensing and collaboration arrangements to the extent possible through internal reviews and estimates of the operational progress of our discovery and early-stage clinical development programs, correspondence with contract research organizations and review of contractual terms. We base our estimates on the best information available at the time. However, additional information may become available to us, which may allow us to make a more accurate estimate in future periods. If we do not identify costs that we have begun to incur or if we underestimate or overestimate the level of services performed or the costs of these services, our actual expenses could differ from our estimates.
Stock Option ValuationStock-based Compensation
Our estimate ofStock-based compensation expense requires us to estimate the fair value of stock options, performance-based restricted stock units (PSUs) and PSUs subject to market conditions, and the estimated the number of shares subject to PSUs that will ultimately vest. To determine the appropriate fair value, model andwe use models that require a number of complex and subjective assumptions including our stock price volatility, employee exercise patterns and related tax effects. The most significant assumptions are our estimates of the expected volatility and the expected term of the stock option.
risk-free interest rates. The value of a stock option is derived from its potential for appreciation. The more volatile the stock, the more valuable the option becomes because of the greater possibility of significant changes in stock price. Because there is a market for options on our common stock, we have consideredconsider implied volatilitiesvolatility as well as our historical volatilitiesvolatility when developing an estimate of expected volatility. The expected option term also has a significant effect on the value of the option. The longer the term, the more time the option holder has to allow the stock price to increase without a cash investment and thus, the more valuable the option. Further, lengthier option terms provide more opportunity to exploittake advantage of market highs. However, empirical data show that employees typically do not wait until the end of the contractual term of a nontransferable option to exercise. Accordingly, we are required to estimate the expected term of the option for input to an option-pricing model. As required under generally accepted accounting principles, we review our valuation assumptions at eachMonte Carlo simulation models are used to determine grant date and, as a result, from time to time we change the valuation assumptions we use tofair value stock options granted.of awards with market conditions. The assumptions used in calculating the fair value of stock options and PSUs represent management’s best estimates, but these estimates involve inherent uncertainties and the application of management judgment. As a result, if factors change and we use different assumptions, our stock-based compensation expense could be materially different in the future. For additional description
We recognize stock-based compensation for PSUs over the requisite service period only for awards which we estimate will ultimately vest, which requires judgment as to the probability and timing of the achievement of the underlying performance goals. Significant factors we consider in making those judgments include forecasts of our product revenues and those of our collaboration partners, estimates regarding the operational progress of late-stage clinical development programs and discovery pipeline expansion performance targets. To the extent actual results, or updated estimates, differ from current estimates, such amounts are recorded as a cumulative adjustment in the period estimates are revised and as such, can materially affect our stock-based compensation see “Note 7. Stock-based Compensation” to our “Notes to Consolidated Financial Statements” containedexpense in Part II, Item 8 of this Annual Report on Form 10-K.the current period and in the future.
Income Taxes
OurWe compute our income tax provision or benefit (provision) is computed under the asset and liability method. Significant estimates are required in determining our income tax benefit (provision). Someprovision or benefit. We base some of these estimates are based on interpretations of existing tax laws or regulations. We recognize deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial statements or tax returns. Under this method, deferred tax assets and liabilities are determined on the basis of the difference between the tax basis of assets and liabilities and their respective financial reporting amounts (temporary differences) at enacted tax rates in effect for the years in which the differences are expected to reverse. A valuation allowance is established for deferred tax assets for which it is more likely than not that some portion or all of the deferred tax assets, including net operating losses and tax credits, will not be realized. We periodically re-assess the need for a valuation allowance against our deferred tax assets based on various factors including our historical earnings experience by taxing jurisdiction, and forecasts of future operating results and utilization of net operating losses and tax credits prior to their expiration. Significant judgment is required in making this assessment and, to the extent that we deem a reversal of any portion of our valuation allowance against our deferred tax assets is deemedto be appropriate, we recognize a tax benefit will be recognized against our income tax provision in the period of such reversal. Prior to 2018, we recorded a valuation allowance that fully offset our deferred tax assets. In the fourth quarter of 2018, based on our evaluation of various factors, including our achievement of a cumulative three-year income position as of December 28, 2018 and forecasts of future operating results, we released substantially all of our valuation allowance against our deferred tax assets and recorded a corresponding income tax benefit as described in “Note 8. Income Taxes”, below. We continue to maintain a valuation allowance against our California state deferred tax assets.
Recent Accounting Pronouncements
For a description of the expected impact of recent accounting pronouncements, see “Note 1. Organization and Summary of Significant Accounting Policies” in the “Notes to Consolidated Financial Statements” contained in Part II, Item 8
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of this Annual Report on Form 10-K.
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Item 7A. Quantitative and Qualitative Disclosures About Market Risk
AsWe are exposed to cash flow and earnings fluctuations as a result of December 31, 2018 and 2017, our exposurecertain market risks. These market risks primarily relate to marketcredit risk, for changes in interest rates relates primarilyand foreign exchange rates. Our investment portfolio is used to preserve our capital until it is required to fund operations, including our research and development activities. None of these market risk-sensitive instruments are held for trading purposes. We do not have derivative financial instruments in our investment portfolio. As of December 31, 2018 and 2017, we had cash and investments of $851.6 million and $457.2 million, respectively. Our investments are subject to interest rate risk, and our interest income may fluctuate due to changes in interest rates.
Credit Risk
We manage marketcredit risk associated with our investment portfolio through diversification requirements mandated by our investment policy, which limits purchases to high-quality issuers and limits the amount of our portfolio that can be invested in a single issuer.
Interest Rate Risk
We limitinvest our credit riskcash in a variety of financial instruments, principally securities issued by limiting purchasesthe U.S. government and its agencies, investment-grade corporate bonds and commercial paper, and money market funds. These investments are denominated in U.S. Dollars. All of our interest-bearing securities are subject to high-quality issuers. For our investments, we obtain the estimated effects of hypothetical interest rate changes from the same third-party pricing sources we use torisk and could decline in value our investments. As of December 31, 2018 and 2017, an increase in theif interest rates fluctuate. Substantially all of our investment portfolio consists of marketable securities with active secondary or resale markets to help ensure portfolio liquidity, and we have implemented guidelines limiting the term-to-maturity of our investment instruments. Due to the conservative and short-term nature of these instruments, we do not believe that we have a material exposure to interest rate risk. If market interest rates were to increase or decrease by one percentage point, would have had a net adverse change in the fair value of interest rate sensitive assetsour investment portfolio would increase or decrease by an immaterial amount.
Foreign Exchange Rate Risk
Fluctuations in the exchange rates of $3.4 millionthe U.S. dollar and $1.6 million, respectively.
foreign currencies may have the effect of increasing or decreasing our revenues and expenses. Royalty revenues and sales-based milestones we receive from our collaboration agreements with Ipsen, Takeda and Genentech are a percentage of the net sales made by those collaboration partners from sales made in countries outside the U.S. and are denominated in currencies in which the product is sold, which is predominantly the Euro. The royalty payments on these ex-U.S. sales are calculated initially in the currency in which the sale is madeEuro or Japanese Yen. Research and are then converted intodevelopment expenses include clinical trial services performed by third-party contract research organizations and other vendors located outside the U.S. dollar to determinethat may bill us in currencies where their services are provided, which is predominantly the amount our partners pay us. Fluctuations in the exchange ratio of the U.S. dollar and these foreign currencies will have the effect of increasing or decreasing our revenues even if the amount of units sold does not change. For example, ifEuro. If the U.S. dollar strengthens against a foreign currency, then our royalty revenues will decrease for the same number of units sold in that foreign currency and the date we achieve certain sales-based milestones wouldmay also be delayed. For the year ended December 31, 2018 and 2017, an average 10% strengthening ofSimilarly, if the U.S. dollar relativeweakens against a foreign currency, then our research and development expenses would increase. However, we believe that we are not subject to the currenciesmaterial risks arising from changes in which these products are soldforeign exchange rates and that a hypothetical 10% increase or decrease in foreign exchange rates would not have resulted in revenues being reduced by approximately $3.8 million and $1.0 million, respectively.a material adverse impact on our financial condition, results of operations or cash flows.
Item 8. Financial Statements and Supplementary Data
EXELIXIS, INC.
INDEX TO CONSOLIDATED FINANCIAL STATEMENTS
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Report of Independent Registered Public Accounting Firm


To the Stockholders and the Board of Directors of Exelixis, Inc.

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of Exelixis, Inc. (the “Company”)Company) as of December 28, 201831, 2021 and December 29, 2017,January 1, 2021, the related consolidated statements of operations,income, comprehensive income, (loss), stockholders’ equity (deficit) and cash flows for each of the three fiscal years in the period ended December 28, 2018,31, 2021, and the related notes (collectively referred to as the “consolidated financial statements“). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company at December 28, 201831, 2021 and December 29, 2017,January 1, 2021, and the results of its operations and its cash flows for each of the three fiscal years in the period ended December 28, 2018,31, 2021, in conformity with U.S. generally accepted accounting principles.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company’s internal control over financial reporting as of December 28, 2018,31, 2021, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 Framework)framework) and our report dated February 22, 201918, 2022 expressed an unqualified opinion thereon.
Adoption of ASU No. 2014-09
As discussed in Note 1 to the consolidated financial statements, the Company changed its method for recognizing revenue as a result of the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606), effective December 30, 2017.
Basis for Opinion

These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on the Company’s financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.


Critical Audit Matter

The critical audit matter communicated below is a matter arising from the current period audit of the financial statements that was communicated or required to be communicated to the audit committee and that: (1) relates to accounts or disclosures that are material to the financial statements and (2) involved our especially challenging, subjective or complex judgments. The communication of the critical audit matter does not alter in any way our opinion on the consolidated financial statements, taken as a whole and we are not, by communicating the critical audit matter below, providing a separate opinion on the critical audit matter or on the accounts or disclosures to which it relates.

Revenue recognition - product sales and accounts receivable
Description of the MatterDuring the year ended December 31, 2021, the Company’s gross product revenues were $1,452.9 million. As discussed in Note 1 of the financial statements, the Company sells its products principally to specialty distributors and specialty pharmacy providers, or collectively, Customers. These Customers subsequently resell the products to health care providers and patients. Revenues from product sales are recognized when control is transferred to the Customer.
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Auditing the Company’s product sales was challenging, specifically related to the effort required to audit Customer sales activity to assess whether incentives resulted in orders in excess of demand and whether any such transactions meet the criteria for revenue recognition. This involved judgmentally assessing factors including market demand, Customer ordering patterns, Customer inventory levels, contractual terms and incentives offered.
How We Addressed the Matter in Our AuditWe obtained an understanding, evaluated the design and tested the operating effectiveness of controls designed to monitor and review inventory levels in the channel and sales under Customer incentive programs. This includes testing relevant controls over the information systems that are important to the initiation, recording and billing of revenue transactions as well as controls over the completeness and accuracy of the data used.

Our audit procedures over the Company’s product sales included, among others, examination of inventory channel reports for unusual trends or transactions as well as performing analytical procedures to detect and investigate anomalies within the data. Procedures included those to detect sales of short dated product near year end as well as testing the completeness and accuracy of the underlying data. We also examined the terms and conditions of any new or amended contracts with Customers and its impact on the Company’s returns reserve. We also confirmed the terms and conditions of contracts directly with a selection of Customers, including whether there are side agreements and terms not formally included in the contract that may impact the Company’s returns reserve. In addition, we obtained written representations from members of the commercial function and the market access group regarding changes to Customer incentives and the completeness of the terms and conditions reported to the legal and accounting departments.

/s/ Ernst & Young LLP

We have served as the Company’s auditor since 2002.

Redwood City, California
February 22, 201918, 2022


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EXELIXIS, INC.
CONSOLIDATED BALANCE SHEETS
(in thousands, except share and per share data)
 December 31,
 2018 2017
ASSETS   
Current assets:   
Cash and cash equivalents$314,775
 $183,164
Short-term investments378,559
 204,607
Short-term restricted cash and investments
 504
Trade receivables, net162,771
 77,300
Other receivables16,056
 3,892
Inventory, net9,838
 6,657
Prepaid expenses and other current assets15,017
 8,750
Total current assets897,016
 484,874
Long-term investments157,187
 64,255
Long-term restricted cash and investments1,100
 4,646
Property and equipment, net50,897
 25,743
Operating lease right-of-use assets5,867
 
Deferred tax assets, net244,111
 
Goodwill63,684
 63,684
Other long-term assets2,424
 12,092
Total assets$1,422,286
 $655,294
LIABILITIES AND STOCKHOLDERS’ EQUITY   
Current liabilities:   
Accounts payable$10,901
 $9,575
Accrued compensation and benefits32,142
 21,073
Accrued clinical trial liabilities18,231
 19,849
Rebates and fees due to customers14,954
 7,565
Accrued collaboration liabilities7,419
 8,974
Current portion of deferred revenue
 31,984
Other current liabilities21,825
 16,150
Total current liabilities105,472
 115,170
Long-term portion of deferred revenue15,897
 238,520
Long-term portion of lease liabilities12,178
 14,938
Other long-term liabilities1,286
 1,705
Total liabilities134,833
 370,333
Commitments
 
Stockholders’ equity:   
Preferred stock, $0.001 par value, 10,000,000 shares authorized and no shares issued
 
Common stock, $0.001 par value; 400,000,000 shares authorized; issued and outstanding: 299,876,080 and 296,209,426 at December 31, 2018 and 2017, respectively300
 296
Additional paid-in capital2,168,217
 2,114,184
Accumulated other comprehensive loss(701) (347)
Accumulated deficit(880,363) (1,829,172)
Total stockholders’ equity1,287,453
 284,961
Total liabilities and stockholders’ equity$1,422,286
 $655,294
The accompanying notes are an integral part of these Consolidated Financial Statements.
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EXELIXIS, INC.
CONSOLIDATED STATEMENTS OF OPERATIONS
(in thousands, except per share data)
 Year Ended December 31,
 2018 2017 2016
Revenues:     
Net product revenues$619,279
 $349,008
 $135,375
Collaboration revenue234,547
 103,469
 56,079
Total revenues853,826
 452,477
 191,454
Operating expenses:     
Cost of goods sold26,348
 15,066
 6,552
Research and development182,257
 112,171
 95,967
Selling, general and administrative206,366
 159,362
 116,145
Restructuring (recovery) charge
 (32) 914
Total operating expenses414,971
 286,567
 219,578
Income (loss) from operations438,855
 165,910
 (28,124)
Other income (expense), net:     
Interest income12,840
 4,883
 2,578
Interest expense
 (8,679) (33,060)
Other, net397
 (3,537) (11,616)
Total other income (expense), net:13,237
 (7,333) (42,098)
Income (loss) before income taxes452,092
 158,577
 (70,222)
Income tax benefit (provision)237,978
 (4,350) 
Net income (loss)$690,070
 $154,227
 $(70,222)
Net income (loss) per share, basic$2.32
 $0.52
 $(0.28)
Net income (loss) per share, diluted$2.21
 $0.49
 $(0.28)
Shares used in computing net income (loss) per share, basic297,892
 293,588
 250,531
Shares used in computing net income (loss) per share, diluted312,803
 312,003
 250,531
December 31,
20212020
ASSETS
Current assets:
Cash and cash equivalents$647,169 $319,217 
Short-term investments819,905 887,319 
Trade receivables, net282,650 160,875 
Inventory27,493 20,973 
Prepaid expenses and other current assets57,530 57,011 
Total current assets1,834,747 1,445,395 
Long-term investments371,112 330,751 
Property and equipment, net104,031 67,384 
Deferred tax assets, net111,663 156,711 
Goodwill63,684 63,684 
Other long-term assets131,002 73,408 
Total assets$2,616,239 $2,137,333 
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable$24,258 $23,632 
Accrued compensation and benefits61,969 51,189 
Accrued clinical trial liabilities77,544 52,251 
Rebates and fees due to customers33,700 20,683 
Accrued collaboration liabilities86,753 12,456 
Other current liabilities53,366 44,447 
Total current liabilities337,590 204,658 
Long-term portion of deferred revenue8,739 3,755 
Long-term portion of operating lease liabilities51,272 49,086 
Other long-term liabilities8,023 721 
Total liabilities405,624 258,220 
Commitments and contingencies (Note 11)00
Stockholders’ equity:
Preferred stock, $0.001 par value, 10,000 shares authorized and 0 shares issued— — 
 Common stock, $0.001 par value; 400,000 shares authorized; issued and outstanding: 318,842 and 311,627 at December 31, 2021 and 2020, respectively319 312 
Additional paid-in capital2,427,561 2,321,895 
Accumulated other comprehensive income(758)4,476 
Accumulated deficit(216,507)(447,570)
Total stockholders’ equity2,210,615 1,879,113 
Total liabilities and stockholders’ equity$2,616,239 $2,137,333 
The accompanying notes are an integral part of these Consolidated Financial Statements.
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EXELIXIS, INC.
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
(in thousands)
 Year Ended December 31,
 2018 2017 2016
Net income (loss)$690,070
 $154,227
 $(70,222)
Other comprehensive income (loss) (1)
(354) 69
 (184)
Comprehensive income (loss)$689,716
 $154,296
 $(70,406)
____________________
(1)Other comprehensive income (loss) consisted solely of unrealized gains or losses, net, on available-for-sale securities arising during the periods presented. There were nominal or no reclassification adjustments to net income (loss) resulting from realized gains or losses on the sale of securities. During the year ended December 31, 2018, there was a tax benefit of $0.2 million related to other comprehensive income as a result of the release of our valuation allowance for our deferred tax assets; there was no income tax benefit or provision related to other comprehensive income (loss) during the remaining periods presented.
The accompanying notes are an integral part of these Consolidated Financial Statements.
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EXELIXIS, INC.
CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (DEFICIT)
(in thousands, except per share data)
 Common Stock Additional
Paid-in
Capital
 Accumulated
Other
Comprehensive
Loss
 Accumulated
Deficit
 Total
Stockholders’
Equity (Deficit)
 Shares Amount    
Balance at December 31, 2015227,960,943
 $228
 1,772,123
 (232) (1,912,925) $(140,806)
Net loss
 
 
 
 (70,222) (70,222)
Other comprehensive loss
 
 
 (184) 
 (184)
Issuance of common stock in settlement of convertible notes54,009,279
 54
 253,026
 
 
 253,080
Issuance of common stock under equity incentive and stock purchase plans7,953,576
 8
 24,530
 
 
 24,538
Stock-based compensation
 
 22,912
 
 
 22,912
Balance at December 31, 2016289,923,798
 290
 2,072,591
 (416) (1,983,147) 89,318
Adoption of Accounting Standards Update (ASU) No. 2016-09, Compensation—Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting

 
 252
 
 (252) 
Net income
 
 
 
 154,227
 154,227
Other comprehensive income
 
 
 69
 
 69
Issuance of common stock under equity incentive and stock purchase plans5,408,177
 5
 17,404
 
 
 17,409
Issuance of common stock on exercise of warrants877,451
 1
 (1) 
 
 
Stock-based compensation
 
 23,938
 
 
 23,938
Balance at December 31, 2017296,209,426
 296
 2,114,184
 (347) (1,829,172) 284,961
Adoption of ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606)

 
 
 
 258,505
 258,505
Adoption of ASU No. 2016-02, Leases (Topic 842)

 
 
 
 234
 234
Net income
 
 
 
 690,070
 690,070
Other comprehensive loss
 
 
 (354) 
 (354)
Issuance of common stock under equity incentive and stock purchase plans3,666,654
 4
 13,407
 
 
 13,411
Stock-based compensation
 
 40,626
 
 
 40,626
Balance at December 31, 2018299,876,080
 $300
 $2,168,217
 $(701) $(880,363) $1,287,453
 Year Ended December 31,
 202120202019
Revenues:
Net product revenues$1,077,256 $741,550 $759,950 
License revenues249,956 167,295 165,914 
Collaboration services revenues107,758 78,693 41,911 
Total revenues1,434,970 987,538 967,775 
Operating expenses:
Cost of goods sold52,873 36,272 33,097 
Research and development693,716 547,851 336,964 
Selling, general and administrative401,715 293,355 228,244 
Total operating expenses1,148,304 877,478 598,305 
Income from operations286,666 110,060 369,470 
Interest income7,672 19,865 27,959 
Other income (expense), net(184)912 680 
Income before income taxes294,154 130,837 398,109 
Provision for income taxes63,091 19,056 77,097 
Net income$231,063 $111,781 $321,012 
Net income per share:
Basic$0.73 $0.36 $1.06 
Diluted$0.72 $0.35 $1.02 
Weighted-average common shares outstanding:
Basic314,884 308,271 302,584 
Diluted322,359 318,001 315,009 
The accompanying notes are an integral part of these Consolidated Financial Statements.

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EXELIXIS, INC.
CONSOLIDATED STATEMENTS OF CASH FLOWSCOMPREHENSIVE INCOME
(in thousands)
 Year Ended December 31,
 2018 2017 2016
Net income (loss)$690,070
 $154,227
 $(70,222)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:     
Depreciation and amortization4,915
 1,187
 1,002
Stock-based compensation40,626
 23,938
 22,912
401(k) matching contributions made in common stock3,696
 1,640
 1,036
Amortization of right-of-use assets2,854
 
 
Deferred taxes(244,111) 
 
Loss on extinguishment of debt
 6,239
 13,901
Amortization of debt discounts and debt issuance costs
 182
 8,432
Interest paid in kind
 (11,825) 8,008
Gain on other equity investments(209) (2,980) (2,494)
Other(2,358) (51) 562
Changes in operating assets and liabilities:     
Trade receivables, net(85,471) (43,299) (38,680)
Other receivables(4,410) 2,460
 3,362
Inventory, net(3,181) (3,319) (722)
Prepaid expenses and other current assets(3,029) (3,268) (1,610)
Other long-term assets(1,086) 430
 1,077
Accounts payable856
 3,010
 164
Accrued compensation and benefits11,069
 739
 16,705
Accrued clinical trial liabilities(1,618) 5,718
 (3,940)
Rebates and fees due customers7,389
 4,145
 3,866
Accrued collaboration liability(1,555) 6,928
 (10,938)
Deferred revenue271
 13,745
 256,759
Long-term portion of lease liabilities(1,225) 14,938
 
Other current and long-term liabilities2,227
 (9,173) 1,224
Net cash provided by operating activities415,720
 165,611
 210,404
Cash flows from investing activities:     
Purchases of property and equipment(33,297) (21,143) (1,703)
Proceeds from sale of property and equipment308
 164
 97
Purchases of investments(557,832) (319,090) (369,187)
Proceeds from maturities of investments280,826
 336,590
 151,485
Proceeds from sale of investments11,936
 37,294
 2,266
Proceeds from other equity investments209
 2,980
 2,494
Net cash (used in) provided by investing activities(297,850) 36,795
 (214,548)
Cash flows from financing activities:     
Proceeds from exercise of stock options12,076
 17,555
 25,327
Proceeds from employee stock purchase plan5,202
 4,868
 2,187
Taxes paid related to net share settlement of equity awards(7,574) (6,563) (4,108)
Principal payments on financing lease obligation(13) 
 
Principal repayments of debt
 (185,788) (575)
Payments on conversion of convertible notes
 
 (7,135)
Net cash provided by (used in) financing activities9,691
 (169,928) 15,696
Net increase in cash, cash equivalents and restricted cash127,561
 32,478
 11,552
Cash, cash equivalents and restricted cash at beginning of period188,314
 155,836
 144,284
Cash, cash equivalents and restricted cash at end of period$315,875
 $188,314
 $155,836
Continued on next page
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EXELIXIS, INC.
CONSOLIDATED STATEMENTS OF CASH FLOWS - continued
(in thousands)
 Year Ended December 31,
 2018 2017 2016
Supplemental cash flow disclosure:     
Cash paid for interest$
 $20,460
 $21,044
Cash paid for taxes$10,677
 $538
 $190
Non-cash investing and financing activities:     
Property and equipment deemed to have been acquired in build-to-suit lease$
 $14,530
 $
Right-of-use assets obtained in exchange for lease obligations (1)
$17,180
 
 $
Unpaid liabilities incurred to acquire Property and equipment$802
 $524
 $
Issuance of common stock in settlement of convertible notes$
 $
 $286,925
____________________
(1)Amounts for the year ended December 31, 2018 include the transition adjustment for the adoption of Topic 842.

 Year Ended December 31,
 202120202019
Net income$231,063 $111,781 $321,012 
Other comprehensive income (loss):
Net unrealized gains (losses) on available-for-sale debt securities, net of tax impact of $1,481, $(394), and $(1,049), respectively(5,234)1,407 3,770 
Comprehensive income$225,829 $113,188 $324,782 
The accompanying notes are an integral part of these Consolidated Financial Statements.
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EXELIXIS, INC.
CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY
(in thousands)
Common StockAdditional
Paid-in
Capital
Accumulated
Other
Comprehensive
Income (Loss)
Accumulated
Deficit
Total
Stockholders’
Equity
SharesAmount
Balance at December 31, 2018299,876 $300 $2,168,217 $(701)$(880,363)$1,287,453 
Net income— — — — 321,012 321,012 
Other comprehensive income— — — 3,770 — 3,770 
Issuance of common stock under equity incentive and stock purchase plans4,955 27,032 — — 27,037 
Stock transactions associated with taxes withheld on equity awards— — (9,904)— — (9,904)
Stock-based compensation— — 56,602 — — 56,602 
Balance at December 31, 2019304,831 305 2,241,947 3,069 (559,351)1,685,970 
Net income— — — — 111,781 111,781 
Other comprehensive income— — — 1,407 — 1,407 
Issuance of common stock under equity incentive and stock purchase plans6,796 24,896 — — 24,903 
Stock transactions associated with taxes withheld on equity awards— — (50,018)— — (50,018)
Stock-based compensation— — 105,070 — — 105,070 
Balance at December 31, 2020311,627 312 2,321,895 4,476 (447,570)1,879,113 
Net income— — — — 231,063 231,063 
Other comprehensive income— — — (5,234)— (5,234)
Issuance of common stock under equity incentive and stock purchase plans7,215 24,360 — — 24,367 
Stock transactions associated with taxes withheld on equity awards— — (39,142)— — (39,142)
Stock-based compensation— — 120,448 — — 120,448 
Balance at December 31, 2021318,842 $319 $2,427,561 $(758)$(216,507)$2,210,615 
The accompanying notes are an integral part of these Consolidated Financial Statements.
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EXELIXIS, INC.
CONSOLIDATED STATEMENTS OF CASH FLOWS
(in thousands)
 Year Ended December 31,
 202120202019
Net income$231,063 $111,781 $321,012 
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation13,630 9,141 8,348 
Stock-based compensation119,820 105,070 56,602 
Non-cash lease expense5,332 4,830 2,819 
Deferred taxes46,529 15,265 71,002 
Other, net23,443 3,035 88 
Changes in operating assets and liabilities:
Trade receivables, net(122,324)(42,470)43,716 
Inventory(13,209)(21,897)(5,731)
Prepaid expenses and other assets(39,875)(25,831)(5,723)
Deferred revenue11,008 (1,051)(9,301)
Accrued collaboration liabilities70,297 600 4,437 
Accounts payable and other liabilities55,090 50,509 39,687 
Net cash provided by operating activities400,804 208,982 526,956 
Cash flows from investing activities:
Purchases of property, equipment and other(64,225)(30,345)(12,834)
Purchases of investments(1,357,168)(1,070,269)(1,182,682)
Proceeds from maturities and sales of investments1,378,509 969,399 608,269 
Net cash used in investing activities(42,884)(131,215)(587,247)
Cash flows from financing activities:
Proceeds from issuance of common stock under equity incentive and stock purchase plans24,307 24,886 22,499 
Taxes paid related to net share settlement of equity awards(39,108)(50,018)(9,904)
Other, net— — (42)
Net cash (used in) provided by financing activities(14,801)(25,132)12,553 
Net increase (decrease) in cash, cash equivalents and restricted cash equivalents343,119 52,635 (47,738)
Cash, cash equivalents and restricted cash equivalents at beginning of period320,772 268,137 315,875 
Cash, cash equivalents and restricted cash equivalents at end of period$663,891 $320,772 $268,137 
Supplemental cash flow disclosures:
Cash paid for taxes$12,960 $4,115 $7,873 
Non-cash operating activities:
Right-of-use assets obtained in exchange for lease obligations$4,893 $4,017 $29,562 
Non-cash investing activities:
Unpaid liabilities incurred in asset acquisition$4,000 $— $— 
Unpaid liabilities incurred for purchases of property and equipment$2,739 $842 $26 
Unpaid liabilities incurred for unsettled investment purchases$— $1,615 $— 
Accounts receivable for unsettled investment sales$— $6,180 $— 

The accompanying notes are an integral part of these Consolidated Financial Statements.
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EXELIXIS, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
NOTE 1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Organization
Exelixis, Inc. (Exelixis, we, our or us) is an oncology-focused biotechnology company that strives to accelerate the discovery, development and commercialization of new medicines for difficult-to-treat cancers. Since we were founded in 1994, four products resulting fromUsing our considerable drug discovery, efforts have progressed through clinical development and received regulatory approval; threecommercialization resources and capabilities, we have a growing commercial presenceinvented and brought to market innovative therapies that appropriately balance patient benefits and risks; we will continue to build on this foundation as we strive to provide cancer patients with new treatment options that improve upon current standards of care.

Today, 4 products that originated in markets worldwide, and we expect thatExelixis laboratories are available to be prescribed to patients. Sales related to our flagship molecule, cabozantinib, account for the fourth will soon enter the marketplace in Japan. Two are derived from cabozantinib,large majority of our revenues. Cabozantinib is an inhibitor of multiple tyrosine kinases including MET, AXL, VEGF receptors and RET. These are:RET and has been approved by the U.S. Food and Drug Administration (FDA) and in 61 other countries as: CABOMETYX® (cabozantinib) tablets approved for advanced renal cell carcinoma (RCC), both alone and in combination with Bristol-Myers Squibb Company’s (BMS) OPDIVO® (nivolumab), for previously treated hepatocellular carcinoma (HCC) and, currently by the FDA, for previously treated, radioactive iodine (RAI)-refractory differentiated thyroid cancer (DTC); and COMETRIQ® (cabozantinib) capsules approved for progressive, metastatic medullary thyroid cancer (MTC). Other commercially availableFor physicians treating these types of cancer, cabozantinib has become or is becoming an important drug in their selection of effective therapies.
The other 2 products resulting from our discovery efforts includeare: COTELLIC® (cobimetinib), an inhibitor of MEK approved as part of amultiple combination regimenregimens to treat specific forms of advanced melanoma and marketed under a collaboration with Genentech, Inc. (a member of the Roche Group) (Genentech),; and MINNEBRO™MINNEBRO® (esaxerenone), an oral, non-steroidal, selective blocker of the mineralocorticoid receptor (MR) approved for the treatment of hypertension in Japan and licensed to Daiichi Sankyo Company, Limited (Daiichi Sankyo).
Our plan is to utilize our operating cash flows and cash and investments to expand the cabozantinib franchise by potentially adding new indications in areas of unmet medical need. We will also leverage our operating cash flows to continue advancing our diverse small molecule and biotherapeutics programs, exploring multiple modalities and mechanisms of action to discover new oncology drugs.
Basis of ConsolidationPresentation
The accompanying Consolidated Financial Statements include the accounts of Exelixis and those of our wholly-owned subsidiaries. These entities’ functional currency is the U.S. dollar. All intercompany balances and transactions have been eliminated.
Basis of Presentation
We have adopted a 52- or 53-week fiscal year policy that generally ends on the Friday closest to December 31st. Fiscal year 20162021, which was a 52-week fiscal year, ended on December 30, 2016;31, 2021, fiscal year 20172020, which was a 52-week fiscal year, ended on December 29, 2017;January 1, 2021 and fiscal year 20182019, which was a 53-week fiscal year, ended on December 28, 2018.January 3, 2020. For convenience, references in this report as of and for the fiscal years ended (or ending, as applicable) December 30, 2016, December 29, 2017,January 1, 2021 and December 28, 2018January 3, 2020 are indicated as being as of and for the years ended (or ending, as applicable) December 31, 2016, 20172020 and 2018,2019, respectively. All annual periods presented are 52-week fiscal years and all interim periods presented are 13-week fiscal quarters.
We have made reclassifications to our prior years’ Consolidated Financial Statements to conform to the current year’s presentation. These reclassifications did not impact previously reported total revenues, income from operations, net income, total assets, total liabilities, total operating, investing or financing cash flows or total stockholders’ equity.
Segment Information
We operate in one1 business segment that focuses on the discovery, development and commercialization of new medicines to improve care and outcomes for people with cancer.difficult-to-treat cancers. Our Chief Executive Officer, as the chief operating decision-maker, manages and allocates resources to our operations on a total consolidated basis. Consistent with this decision-making process, our Chief Executive Officer uses consolidated, single-segment financial information for purposes of evaluating performance, forecasting future period financial results, allocating resources and setting incentive targets.
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All of our long-lived assets are located in the U.S. See “Note 2. Revenues” for enterprise-wide disclosures about product sales, revenues from major customers and revenues by geographic region.
Use of Estimates
The preparation of the accompanying Consolidated Financial Statements conforms to accounting principles generally accepted in the U.S., which requires management to make judgments, estimates and assumptions that affect the reported amounts of assets, liabilities, equity, revenues and expenses, and related disclosures. On an ongoing basis, management evaluates its estimates including, but not limited to: those related to revenue recognition, including determining the nature and timing of satisfaction of performance obligations, and determining the standalone selling price of performance obligations, and variable consideration such as rebates, chargebacks, sales returns and sales allowances as well as milestones included in collaboration arrangements; the amounts of revenues and expenses underwe evaluate our profit and loss sharing agreement; recoverability of inventory; operating lease assets and liabilities; the amounts of deferred tax assets and liabilities including the related valuation allowance; the accrual for certain liabilities including accrued clinical trial liabilities; and valuations of equity awards used to determine stock-based compensation, including certain awards with vesting subject to market or performance conditions.significant estimates. We base our estimates on historical experience and on various other market-specific
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and other relevant assumptions that we believe to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results could differ materially from those estimates.
Recently Adopted Accounting Pronouncements
Restricted Cash
InOn January 2018,1, 2021, we adopted the Accounting Standards Board’s (FASB) Accounting Standards Update (ASU) 2019-12, Income Taxes (Topic 740)-Simplifying the Accounting for Income Taxes (ASU 2019-12). ASU No. 2016-18, Statement2019-12 simplifies the accounting for income taxes by removing certain exceptions to the general principles in Accounting Standards Codification (ASC) Topic 740, Income Taxes and clarifying and amending existing guidance. Our adoption of Cash Flows (Topic 230): Restricted Cash (a consensus of the FASB Emerging Issues Task Force), (ASU 2016-18).ASU 2016-18 requires that2019-12 did not have a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash. Therefore, amounts generally described as restricted cash are included with cash when reconciling the beginning-of-period and end-of-period total amounts shownsignificant impact on the statement of cash flows. ASU 2016-18 was adopted using the retrospective transition method in the accompanying Consolidated Financial Statements.
As a result of the adoption of ASU 2016-18, we no longer include purchases of restricted cash and proceeds from maturities of restricted cash in our cash flows from investing activities. Accordingly, the adoption of ASU 2016-18 resulted in a $1.0 million and $1.5 million increase in Net cash provided by investing activities for the years ended December 31, 2017 and 2016, respectively.
See “Note 4. Cash and Investments—Cash, Cash Equivalents, and Restricted Cash” for a reconciliation of cash and cash equivalents presented in our previously published Consolidated Statement of Cash Flows for the years ended December 31, 2017 and 2016 and Cash, cash equivalents and restricted cash reported in the accompanying Consolidated Statement of Cash Flows for the same periods.
Revenue
On January 1, 2018, we adopted Topic 606 using the modified retrospective method applied to those contracts that were not completed as of January 1, 2018. Results for the year ended December 31, 2018 are presented under Topic 606, while prior period amounts are not adjusted and continue to be reported in accordance with our historic accounting under previous revenue recognition guidance, Accounting Standards Codification (ASC) Topic 605: Revenue Recognition (Topic 605).
Leases
On July 1, 2018 we early adopted Topic 842. We adopted Topic 842 using the modified retrospective approach with a cumulative-effect adjustment as of January 1, 2018 in accordance with ASU No. 2018-11, Leases (Topic 842) - Targeted Improvements. Results for the year ended December 31, 2018 are presented under Topic 842. Prior period amounts have not been adjusted and continue to be reported in accordance with our historical accounting under previous lease guidance, ASC Topic 840: Leases (Topic 840). We elected the package of practical expedients permitted under the transition guidance within the new standard, which among other things, allowed us to carry forward the historical lease classification of those leases in place as of January 1, 2018.
Impact of Adoption of Topic 606 and Topic 842
We recorded a net reduction of $258.5 million to opening accumulated deficit as of January 1, 2018, due to the cumulative impact of adopting Topic 606, with the impact primarily relating to a change in the recognition of upfront and non-substantive milestone payments received related to our collaboration arrangements with Ipsen Pharma SAS (Ipsen) and Takeda Pharmaceutical Company Ltd. (Takeda). The adoption of Topic 606 did not have an impact on our recognition of revenue from product sales.
We also recorded a net reduction of $0.2 million to opening accumulated deficit as of January 1, 2018, due to the cumulative impact of adopting Topic 842, with the impact relating to a change in the classification of certain of our buildings in our Lease Agreement (the Lease) with Ascentris 105, LLC (Ascentris) from a build to suit lease to an operating lease. For a description of the Lease, see “Note 11. Commitments.”
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The impact of the adoption of Topic 606 and Topic 842 on the accompanying Consolidated Balance Sheet as of January 1, 2018 was as follows (in thousands):
 December 31, 2017 Adjustments Due to the Adoption of Topic 606 Adjustments Due to the Adoption of Topic 842 January 1, 2018
Contract assets: unbilled collaboration revenue, gross:       
Current portion$
 $9,588
 $
 $9,588
Long-term portion$
 $12,247
 $
 $12,247
Other receivables$3,892
 $
 $7,743
 $11,635
Property and equipment, net$25,743
 $
 $(14,530) $11,213
Operating lease right-of-use assets$
 $
 $8,579
 $8,579
Contract liabilities: deferred revenue, gross:       
Current portion$31,984
 $(23,591) $
 $8,393
Long-term portion$238,520
 $(213,079) $
 $25,441
Operating lease liabilities:       
Other current liabilities(1)
$16,150
 $
 $3,173
 $19,323
Long-term portion of lease liabilities (2)
$14,938
 $
 $(1,615) $13,323
Accumulated deficit$(1,829,172) $258,505
 $234
 $(1,570,433)
____________________
(1) Includes deferred rent and current portion of operating lease liabilities.
(2) Long-term portion of operating lease liabilities and Financing obligation for build-to-suit lease.
The adjustments due to the adoption of Topic 606 primarily related to a reduction in deferred revenue driven by the allocation of the transaction price to our license performance obligations in the Ipsen and Takeda collaborations, which were determined to be functional intellectual property that was transferred at a point in time and as a result, revenue was recorded at a point in time. Previously under Topic 605, revenue related to the upfront payments and one non-substantive milestone payment earned in 2016 had been deferred over the estimated period of performance pursuant to the terms of the contract. Contract assets as of January 1, 2018 primarily related to estimated revenue for reimbursements for our continuing research and development services and the $10.0 million milestone from Ipsen’s filing with the European Medicines Agency (EMA) for cabozantinib as a treatment for patients with previously treated HCC, that was deemed probable under Topic 606 prior to January 1, 2018. Deferred revenue as of January 1, 2018 was related to the up-front, nonrefundable, fees and milestones earned that were allocated to our research and development services performance obligation which had not been satisfied as of that date. Contract assets and liabilities are netted by collaboration agreement in our Consolidated Balance Sheets; however, for illustration purposes the above amounts are shown prior to netting.
The adjustments due to the adoption of Topic 842 primarily related to the recognition of an operating lease right-of-use asset and operating lease liability for the Lease. In addition, the adoption of Topic 842 resulted in a change in classification of the build-to-suit component of the Lease under Topic 840 to an operating lease under Topic 842 and as a result we derecognized the estimated fair value of the building shells that were included in Property and equipment, net as of December 31, 2017, as we had been deemed to own these buildings under Topic 840. For a description of the Lease, see “Note 11. Commitments” in these Consolidated Financial Statements.
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The impact of the adoption of Topic 606 and Topic 842 on the accompanying Consolidated Statements of Operations for year ended December 31, 2018 was as follows (in thousands):
 Year Ended December 31, 2018
 As Reported Effect of Adoption of Topic 606 Higher / (Lower) Effect of Adoption of Topic 842 Higher / (Lower) Balances Without the Adoption of Topic 606 or 842
Collaboration revenues$234,547
 $(35,882) $
 $270,429
Total revenues$853,826
 $(35,882) $
 $889,708
Selling, general and administrative expenses$206,366
 $
 $1,204
 $205,162
Total operating expenses$414,971
 $
 $1,204
 $413,767
Interest expense$
 $
 $(631) $(631)
Total other income (expense), net$13,237
 $
 $631
 $12,606
Income before income taxes$452,092
 $(35,882) $(573) $488,547
Income tax benefit (provision)$237,978
 $(48,325) $73
 $286,230
Net income$690,070
 $(84,207) $(500) $774,777
Net income per share, basic$2.32
 $(0.28) $
 $2.60
Net income per share, diluted$2.21
 $(0.27) $
 $2.48
If we had not adopted Topic 606, we would also have recognized a $10.0 million milestone in the first quarter of 2018 upon the validation of Ipsen’s filing with the EMA for cabozantinib as a treatment for patients with previously treated HCC that was recognized under Topic 606 as part of our adoption transition adjustment on January 1, 2018. The adoption of Topic 606 also resulted in a reduction of previously reported deferred revenue that was recorded as part of our adoption transition adjustment as of January 1, 2018.
CashEquivalents and Investments
We consider all highly liquid investments purchased with an original maturity of three months or less to be cash equivalents. Cash equivalents include high-grade, short-term investments in money market funds, certificates of deposit and marketable debt securities which are subject to minimal credit and market risk.
We have designateddesignate all investments in marketable debt securities as available-for-sale and therefore, report such investments are reported at fair value, with unrealized gains and losses recorded in accumulated other comprehensive loss.income. For securities sold prior to maturity, the cost of securities sold is based on the specific identification method. RealizedWe include realized gains and losses on the sale of investments are included in Interest and other income, net in the accompanying Consolidated Statements of Operations.Income.
We classify those investments that we do not require for use in current operations and that mature in more than 12 months as Long-termlong-term investments in the accompanying Consolidated Balance Sheets. The classification of restricted cash equivalents as short-term or long-term is dependent upon the longer of the remaining term to maturity of the investment or the remaining term of the related restriction.
AllInvestment Impairment
Quarterly, we assess each of our investments are subject to a quarterly impairment review. We recognize an impairment charge when a decline in theavailable-for-sale debt securities whose fair value of an investmentis below its cost basis to determine if the investment’s impairment is judgeddue to be other-than-temporary.credit-related factors or noncredit-related factors. Factors considered in determining whether a lossan impairment is temporarycredit-related include the length of time and extent to which the investmentsinvestment’s fair value has beenis less than theirits cost basis, declines in published credit ratings, issuer default on interest or principal payments, and declines in the financial condition and near-term prospects of the issuer, extentissuer. If we determine a credit-related impairment exists, we will measure the credit loss based on a discounted cash flows model. Credit-related impairments on available-for-sale debt securities are recognized as an allowance for credit losses with a corresponding adjustment to other income, net in the accompanying Consolidated Statements of Income. The portion of the loss relatedimpairment that is not credit-related is recorded as a reduction of other comprehensive income (loss), net of applicable taxes.
We have elected to creditexclude accrued interest from both the fair value and the amortized cost basis of the available-for-sale debt securities for the purposes of identifying and measuring an impairment. We write-off accrued interest as a reduction of interest income when an issuer the expected cash flows from the security, our intent to sell the security and whether or not we will be required to sell the security before we are able to recover our carrying value.
Accounts Receivable
Trade accounts receivable are recorded net of allowances for chargebacks and cash discounts for prompt payment, as described further below. Estimates of our allowance for doubtful accounts are determined basedhas defaulted on existing contractual payment terms, historical payment patterns of our customers and individual customer circumstances, an analysis of days sales outstanding by geographic region andinterest payments due on a review of the local economic environment and its potential impact on government funding and reimbursement practices. Historically, the amounts of uncollectible accounts receivable that have been written off were nominal.
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security.
Fair Value Measurements
FairWe define fair value reflectsas the amounts that would be received upon sale of an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (exit price). We discloseWhen determining the fair value of financial instrumentsmeasurements for assets and liabilities for which the value is practicableare required to estimate. For those financial instruments measured andbe recorded at fair value, onwe consider the principal or most advantageous market in which we would transact and the market-based risk measurements or assumptions that
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market participants would use in pricing the asset or liability, such as risks inherent in valuation techniques, transfer restrictions and credit risks.
Forward Foreign Currency Contracts
In January 2021, we initiated an operational hedging program and entered into forward contracts to hedge certain operational exposures for the changes in foreign currency exchange rates associated with assets or liabilities denominated in foreign currencies, primarily the Euro.
As of December 31, 2021, we had 1 forward contract outstanding to sell €9.8 million. The forward contract with a recurring basis, we also providematurity of three months is recorded at fair value hierarchy informationand is included in these Notes toprepaid expenses and other current assets in the Consolidated Financial Statements.Balance Sheets. The fair value hierarchy hasunrealized loss on the following three levels:
Level 1 – Fair values are determined utilizing quoted prices (unadjusted) in active markets for identical assets and liabilities that the reporting entity can access at the measurement date.
forward contract is not material as of December 31, 2021. The forward contract is considered a Level 2 – Fair values are determined utilizing observable inputs that are observable either directly or indirectly, other than quoted prices in active markets for identical assets and liabilities. These inputs include using prices from independent pricing services based on quoted prices in active markets for similar instruments or on industry models using data inputs, such as interest rates and prices that can be directly observed or corroborated in active markets.
Level 3 – Fair values are determined utilizing inputs that are both significant to the fair value measurement and unobservable.
A review of the fair value hierarchy classificationof our fair value measurements. For the year ended December 31, 2021, we recognized $0.8 million of net gains on the maturity of our forward contracts, which is conductedincluded in other income (expense), net on a quarterly basis. Changesour Consolidated Statements of Income.
Foreign Currency Remeasurement
Monetary assets and liabilities denominated in currencies other than the functional currency are remeasured using exchange rates in effect at the end of the period and related gains or losses are recorded in other income, net in the observabilityaccompanying Consolidated Statements of valuation inputs may resultIncome. Net foreign currency gains or losses were immaterial for the years ended December 31, 2021, 2020 and 2019, respectively.
Accounts Receivable
Trade receivables, net, contain amounts billed to our customers for product sales, and amounts billed to our collaboration partners for development, regulatory and sales-based milestone payments, royalties on the sale of licensed products, profit-sharing arrangements, development cost reimbursements, and payments for product supply services. Our customers are primarily pharmaceutical and biotechnology companies that are located in a reclassificationthe U.S., and collaboration partners that are located in Europe and Japan. We record trade receivables net of levelsallowances for certain investments withincredit losses and chargebacks, and cash discounts for prompt payment. We apply an aging method to estimate credit losses and consider our historical loss information, adjusted to account for current economic conditions, and reasonable and supportable forecasts of future economic conditions affecting our customers. We write off trade receivables and related allowances for credit losses when it becomes probable we will not collect the fair value hierarchy.amount receivable. Write-offs for the years ended December 31, 2021 and 2020 have been insignificant.
Inventory
We value inventory at the lower of cost or net realizable value. We determine the cost of inventory using the standard-cost method, which approximates actual cost based on a first-in, first-out method. We analyze our inventory levels quarterly and write down inventory subject to expiry in excess of expected requirements, or that has a cost basis in excess of its expected net realizable value. These inventory-related costswrite downs are recognized as Costcharged to either cost of goods sold or the cost of supplied product included in collaboration services revenues in the accompanying Consolidated Statements of Operations.
Income. On a quarterly basis, we analyze our estimated production levels for the following twelve monthtwelve-month period, which is our normal operating cycle, and reclassify inventory we expect to use or sell in periods beyond the next twelve months into Otherother long-term assets in the accompanying Consolidated Balance Sheets.
Property and Equipment
PropertyWe record property and equipment are recorded at cost, and depreciatednet of depreciation. We compute depreciation using the straight-line method over the followingbased on estimated useful lives once it is placed into service: 
Asset CategoryEstimated Useful Life
Lab equipment5 years
Furniture and fixtures7 years
Office equipment5 years
Computer equipment and software3 years
Leaseholdof the assets, which ranges up to 15 years and depreciate leasehold improvements7 to 15 years
Leasehold improvements are depreciated over the lesser of their estimated useful lives or the remainder of the lease term. Capitalized software includes certain internal use computer software costs. RepairsWe charge repairs and maintenance costs are charged to expense as incurred.
Goodwill
Goodwill amounts have been recorded as the excess purchase price over tangible assets, liabilities We periodically review property and intangible assets acquired based on their estimated fair value. Goodwill is not subject to amortization. We assess the recoverability of our goodwill annually, or more frequentlyequipment for impairment whenever events or changes in circumstances indicate that the carrying amount of a reporting unitan asset may exceed itsnot be recoverable. We did not recognize impairment charges in any of the periods presented.
Goodwill
We recorded goodwill amounts as the excess of purchase price over identifiable net assets acquired based on their estimated fair value. We review the carrying amount of goodwill for impairment annually and whenever events or changes
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in circumstance indicate that the carrying value may not be recoverable. We perform our annual assessment of the recoverability of our goodwill as of the first day of our fourth quarter. The assessment of recoverability may first consider qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than notmore-likely-than-not that the fair value of a reporting unit is less than its carrying amount. AWe perform a quantitative assessment is performed if the qualitative assessment results in a more-likely-than-not determination or if a qualitative assessment is not performed. The quantitative
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assessment considers whether the carrying amount of a reporting unit exceeds its fair value, in which case an impairment charge is recorded tofor the extentamount by which the carrying amount of thea reporting unit’s goodwillunit exceeds its implied fair value.value, limited to the goodwill balance. We continue to operate in one1 business segment, which is also considered to be our sole reporting unit and therefore, goodwill wasis tested for impairment at the enterprise level as of December 31, 2018 and 2017.level. We did not recognize any impairment charges in any of the periods presented.
Long-Lived Assets

The carrying value of our long-lived assets, which includes property and equipment, right-of-use assets and leasehold improvements, is reviewed for impairment whenever events or changes in circumstances indicate that the carrying value of the asset may not be recoverable. AnShould there be an indication of impairment, loss would be recognized whenwe test for recoverability by comparing the estimated undiscounted future cash flows expected to result from the use of the asset andto the carrying amount of the asset or asset group. If the asset or asset group is determined to be impaired, any excess of the carrying value of the asset or asset group over its eventual dispositionestimated fair value is less than its carrying amount.recognized as an impairment loss.
Revenue
We account for revenues under the guidance of ASU Topic 606, supersedes all previous revenue recognition requirements in accordanceRevenues from Contracts with generally accepted accounting principles. This standard applies to all contracts with customers, except for contracts that are within the scope of other standards, such as leases, insurance, collaboration arrangements and financial instruments.Customers (Topic 606). Under Topic 606, an entity recognizes revenue when its customer obtains control of promised goods or services, in an amount that reflects the consideration to which the entity is entitled to in exchange for those goods or services. To determine revenue recognition for arrangements that we determine are within the scope of Topic 606, we perform the following five steps: (i)(1) identify the contract(s) with a customer; (ii)(2) identify the performance obligations in the contract; (iii)(3) determine the transaction price; (iv)(4) allocate the transaction price to the performance obligations in the contract; and (v)(5) recognize revenue when (or as) we satisfy a performance obligation. We only apply the five-step model to contracts when it is probable that we will collect the consideration we are entitled to in exchange for the goods or services we transfer to the customer.
Net Product Revenues
We sell our products principally to specialty distributors and specialty pharmacy providers, or collectively, our Customers. These Customers subsequently resell our products to health care providers and patients. In addition to distribution agreements with Customers, we enter into arrangements with health care providers and payors that provide for government-mandated and/or privately-negotiated rebates, chargebacks and discounts with respect to the purchase of our products. Revenues from product sales are recognized when the Customer obtains control of our product, which occurs at a point in time, typically upon delivery to the Customer.
Product Sales Discounts and Allowances
RevenuesWe record revenues from product sales are recorded at the net sales price (transaction price), which includes estimates of variable consideration for which reserves are established and that resultprimarily from discounts, chargebacks, rebates, co-pay assistance, returns and other allowances that are offered within contracts between us and our Customers, health care providers, payors and other indirect customers relating to the sales of our products. These reserves are based on 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 the Customer) or a current liability (if the amount is payable to a party other than a Customer). Where appropriate, these estimates take into consideration a range of possible outcomes that are probability-weighted for relevant factors such as our historical experience, current contractual and statutory requirements, specific known market events and trends, industry data and forecasted Customer buying and payment patterns. Overall, these reserves reflect our best estimates of the amount of consideration to which we are entitled based on the terms of our contracts. The amount of variable consideration that is included in the transaction price may be constrained, and is included in the net sales price only to the extent that it is probable that a significant reversal in the amount of the cumulative revenue recognized will not occur in a future period. Actual amounts of consideration ultimately received may differ from our estimates. If actual results in the future vary from our estimates, we will adjust these estimates, which would affect net product revenues and earnings in the period such variances become known.
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Chargebacks: Chargebacks are discounts that occur when contracted customersCustomers purchase directly from a specialty distributor. Contracted customers,Customers, which currently consist primarily of Public Health Service institutions, non-profit clinics, Federal government entities purchasing via the Federal Supply Schedule, and Group Purchasing Organizations, and health maintenance organizations, generally purchase the product at a discounted price. The specialty distributor, in turn, charges back to us the difference between the price initially paid by the specialty distributor and the discounted price paid to the
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specialty distributor by the customer.Customer. The allowance for chargebacks is based on actual chargebacks received and an estimate of sales to contracted customers.Customers.
Discounts for Prompt Payment: Our Customers in the U.S. receive a discount of 2% for prompt payment. We expect our Customers will earn 100% of their prompt payment discounts and, therefore, we deduct the full amount of these discounts from total product sales when revenues are recognized.
Rebates: Allowances for rebates include mandated discounts under the Medicaid Drug Rebate Program, other government programs and commercial contracts. Rebate amounts owed after the final dispensing of the product to a benefit plan participant are based upon contractual agreements or legal requirements with public sector benefit providers, such as Medicaid. The allowance for rebates is based on statutory or contractual discount rates and expected utilization. Our estimates for the expected utilization of rebates are based on customerCustomer and payer data received from the specialty pharmacies and distributors and historical utilization rates. Rebates are generally invoiced by the payer and paid in arrears, such that the accrual balance consists of an estimate of the amount expected to be incurred for the current quarter’s shipments to our customers,Customers, plus an accrual balance for known prior quarters’ unpaid rebates. If actual future rebates vary from estimates, we may need to adjust our accruals, which would affect net product revenues in the period of adjustment.
Allowances for rebates also include amounts related to the Medicare Part D Coverage Gap Discount Program. In the U.S., during 2020, theMedicare Part D prescription drug benefit mandatesmandated participating manufacturers to fund 50%, and increasing to 70% in 2019, of the Medicare Part D insurance coverage gap for prescription drugs sold to eligible patients. Our estimates for expected Medicare Part D coverage gap amounts are based on customerCustomer and payer data received from specialty pharmacies and distributors and historical utilization rates. Funding of the coverage gap is invoiced and paid in arrears so that the accrual balance consists of an estimate of the amount expected to be incurred for the current quarter’s shipments to customer,Customer, plus an accrual balance for known prior quarters’ unpaid claims. If actual future funding varies from estimates, we may need to adjust our accruals, which would affect net product revenues in the period of adjustment.
Co-payment Assistance: Patients who have commercial insurance and meet certain eligibility requirements may receive co-payment assistance. We accrue a liability for co-payment assistance based on actual program participation and estimates of program redemption using customerCustomer data provided by the specialty distributor that administers the copay program.
Other Customer Credits: We pay fees to our Customers for account management, data management and other administrative services. To the extent the services received are distinct from the sale of products to the Customer, we classify these payments are classified in Selling,selling, general and administrative expenses in our Consolidated Statements of Operations.Income.
Collaboration Revenues
We assess whether our collaboration agreements are subject to ASC Topic 808, Collaborative Arrangements (Topic 808) based on whether they involve joint operating activities and whether both parties have active participation in the arrangement and are exposed to significant risks and rewards. To the extent that the arrangement falls within the scope of Topic 808, we apply by analogy the unit of account guidance under Topic 606 to identify distinct performance obligations, and then determine whether a customer relationship exists for each distinct performance obligation. If we determine a performance obligation within the arrangement is with a customer, we apply the guidance in Topic 606. If a portion of a distinct bundle of goods or services within an arrangement is not with a customer, then the unit of account is not within the scope of Topic 606, and the recognition and measurement of that unit of account shall be based on analogy to authoritative accounting literature or, if there is no appropriate analogy, a reasonable, rational, and consistently applied accounting policy election.
We enter into collaboration arrangements, under which we license certain rights to our intellectual property to third parties. The terms of these arrangements typically include paymentpayments to us for one or more of the following: non-refundable,nonrefundable up-front license fees; development, regulatory and commercialsales-based milestone payments; product supply services; development cost reimbursements; profit sharingprofit-sharing arrangements; and royalties on net sales of licensed products. Except for profit sharing arrangements and payments for product supply services, each of these payment types were within the scope of Topic 606 during the year ended December 31, 2018. As part of the accounting for these arrangements, we must develop assumptions that require judgment to determine the standalone selling price for each performance obligation identified in the contract. These key assumptions may include
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forecasted revenues, clinical development timelines and costs, reimbursement rates for personnel costs, discount rates and probabilities of technical and regulatory success. Prior period amounts continue to be reported in accordance with our historic accounting under previous revenue recognition guidance, Topic 605. See “ — Recently Adopted Accounting Pronouncements — Impact of Adoption of Topic 606 and Topic 842” above, for more information about the impact of the adoption on Topic 606.
Up-front License Fees: If the license to our intellectual property is determined to be distinct from the other performance obligations identified in the arrangement, we recognize revenues from nonrefundable up-front fees allocated to the license when the license is transferred to the licensee and the licensee is able to use and benefit from the license.license, which generally occurs at or near the inception of the contract. For licenses that are bundled with other promises, we utilize judgment to assess the nature of the combined performance obligation to determine whether the combined performance obligation is satisfied over time or at a point in time and, if over time, the appropriate method of measuring progress for purposes of recognizing revenuerevenues from non-refundable,nonrefundable up-front fees. We evaluate the measure of progress at the end of each reporting period and, if necessary, adjust the measure of performance and related revenue recognition.
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Regulatory and Development Milestone Payments: At the inception of each arrangement that includes development milestone payments, we evaluate whether the milestones are considered probable of being reached and estimate the amount to be included in the transaction price using the most likely amount method. If it is probable that a significant revenue reversal would not occur, the associated milestone value is included in the transaction price. Milestone payments that are not within our or the licensee’s control, such as regulatory approvals, are not considered probable of being achieved until uncertainty associated with the approvals has been resolved. The transaction price is then allocated to each performance obligation, on a relative standalone selling price basis, for which we recognize revenue as or when the performance obligations under the contract are satisfied. At the end of each subsequent reporting period, we re-evaluate the probability of achieving such development and regulatory milestones and any related variable consideration constraint, and if necessary, adjust our estimate of the overall transaction price. Any such adjustments are recorded on a cumulative catch-up basis, which would affect Collaboration revenues and earnings in the period of adjustment.basis.
Product Supply Services: Arrangements that include a promise for the future supply of drug product for either clinical development or commercial supply at the licensee’s discretion are generally considered as options. We assess if these options provide a material right to the licensee and if so, they are accounted for as separate performance obligations.
Development Cost Reimbursements: Our Ipsen and Takedacollaboration arrangements may include promises of future clinical development and drug safety services, as well as participation on certain joint committees. We have determined that theseWhen such services collectivelyare provided to a customer, and they are distinct from the licenses provided to Ipsen and Takeda and as such,our collaboration partners, these promises are accounted for as a separate performance obligation, recorded over time. We record revenue for these services as the performance obligations are satisfied, which we estimate using internal development costs incurred and projections through the term of the arrangements. We record revenues for these services as the performance obligations are satisfied over time based on measure of progress. However, if we conclude that our collaboration partner is not a customer for those collaborative research and development activities, we present such payments as a reduction of research and development expenses.
Profit SharingProfit-sharing Arrangements: Under the terms of our collaboration agreement with Genentech for cobimetinib, we are entitled to a share of U.S. profits and losses received in connection with the commercialization of cobimetinib. We are also entitled to low double-digit royalties on ex-U.S. net sales. We account for such arrangementsthis arrangement in accordance with ASC Topic 808: Collaborative Arrangements (Topic 808).606. We have determined that we are an agent under the agreement and therefore revenues are recorded net of costs incurred. We record U.S.revenues for the variable consideration associated with the profits and losses under the collaboration agreement when it is probable that a significant reversal in the period earned based on our estimateamount of those amounts. Wecumulative revenues recognized an annual profit under the agreement for the year ending December 31, 2018will not occur.
Royalty and accordingly, those profits are recognized as Collaboration revenues in the accompanying Consolidated Statements of Operations. Prior to 2018, the commercialization of cobimetinib in the U.S. had not been profitable for any annual period and accordingly, losses for periods prior to 2018 were recognized as Selling, general and administrative expenses in the accompanying Consolidated Statements of Operations.
Sales-based Milestone Payments and Royalties:Payments: For arrangements that include royalties and sales-based royalties,milestone payments, including milestone payments based onearned for the volumefirst commercial sale of sales,a product, the license is deemed to be the predominant item to which the royalties or sales-based milestonessuch payments relate and we recognize revenuerevenues at the later of (i) when the related sales occur or (ii) when the performance obligation to which some or all of the royalty has been allocated has been satisfied (or partially satisfied).satisfied.
Cost of Goods Sold
Cost of goods sold is related to our product revenues and consists primarily of a 3% royalty we are required to pay GlaxoSmithKline (GSK) on all net sales of any product incorporating cabozantinib, indirect labor costs, the cost of manufacturing, indirect labor costs, write-downs related to expiring and excess inventory, shipping and other third-party logistics and distribution costs for our product.
We consider regulatory approval of product candidates to be uncertain and product manufactured prior to regulatory approval may not be sold unless regulatory approval is obtained. As such, the manufacturing costs for product candidates incurred prior to regulatory approval were not capitalized as inventory but are expensed as research and development costs. Portions
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Table of the manufacturing costs for inventory sold during the years ended December 31, 2018, 2017 and 2016 were incurred prior to the regulatory approval of CABOMETYX and COMETRIQ and, therefore, were expensed as research and development costs when incurred, rather than capitalized as inventory. There were no amounts remaining related to previously expensed materials in our inventory balances as of December 31, 2018.Contents
Research and Development Expenses
Research and development costs are expensed as incurred and include costs associated with research performed pursuant to collaborative agreements. Research and development costsexpenses consist of (1) direct and indirect internal costs relatedfor drug discovery; (2) upfront license and project initiation fees, license option fees and option exercise fees, funded research and milestone payments incurred or probable to specificbe incurred for our in-licensing arrangements with our collaboration partners for research programs in development and prior to regulatory approval; and (3) development costs associated with our clinical trial projects, as well aswhich include fees paid to other entities that conduct certain research activitiesContract Research Organizations (CRO) performing work on our behalf.
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Substantial portions of our preclinical studies and all of ourOur clinical trialstrial projects have been executed with support from third-party contract research organizationsCROs, who specialize in conducting and other vendors. We accrue expenses for preclinical studies performed by our vendors based on certain estimates over the term of the service period and adjust our estimates as required.managing global clinical trials. We accrue expenses for clinical trial activities performed by contract research organizationsthe CROs based upon the estimated amount of work completed on each trial. For clinical trial expenses, the significant factors used in estimating accruals include direct CRO costs, the number of patients enrolled, the number of active clinical sites andinvolved, the duration for which the patients will be enrolled in the trial.trial and patient out of pocket costs. We monitor patient enrollment levels and related activities to the extent possible through CRO meetings and correspondence, internal reviews correspondence with contract research organizations and review of contractual terms. We base our estimates on the best information available at the time. However, additional information may become available to us which may allow us to make a more accurate estimate in future periods. In this event, we may be required to record adjustments to research and development expenses in future periods when the actual level of activity becomes more certain. As described further above, certain payments made to us from our collaboration partners may be presented as a reduction of research and development expense.
Leases
We determine if an arrangement includes a lease at inception. Operating leases are included in operatingthe inception of the agreement. For each of our lease arrangements, we record a right-of-use assets, other current liabilities, and long-term lease liabilities in our Consolidated Balance Sheet at December 31, 2018. Right-of-use assets representasset representing our right to use an underlying asset for the lease term and a lease liabilities representliability representing our obligation to make lease payments arising from the lease.payments. Operating lease right-of-use assets and liabilities are recognized at the lease commencement date based on the net present value of lease payments over the lease term. In determining the discount rate used to calculate the net present value of lease payments, we use our incremental borrowing rate based on the information available at the lease commencement date. The operating lease right-of-use assets also include any lease payments made and exclude lease incentives. Our leases may include options to extend or terminate the lease which are included in the lease term when it is reasonably certain that we will exercise any such options. Lease expense for our operating leases is recognized on a straight-line basis over the expected lease term. We have elected not to apply the recognition requirements of ASU 2016-02, Leases (Topic 842842) for short-term leases.
For lease agreements entered into after the adoption of Topic 842 that include leaseAdvertising
Advertising expenses were $31.8 million, $25.1 million and non-lease components, such components are generally accounted for separately. For our building leases, as a result of us having elected to adopt the package of practical expedients permitted under the Topic 842 transition guidance, we account$17.9 million for the leaseyears ended December 31, 2021, 2020 and non-lease components, such2019, respectively. We expense the costs of advertising, including promotional expenses, as common area maintenance charges, as a single lease component.
Prior period amounts continue to be reportedincurred. Advertising expenses are recorded in accordance with our historic accounting under previous lease guidance, Topic 840. See “ — Recently Adopted Accounting Pronouncements — Impact of Adoption of Topic 606selling, general and Topic 842” above, for more information about the impact of the adoption on Topic 842.administrative expenses.
Stock-Based Compensation
We account for stock-based payments to employees, including grants of service-based restricted stock units (RSUs), performance-based restricted stock units (PSUs), service-based stock options and purchases under our 2000 Employee Stock Purchase Plan (ESPP) in accordance with ASC 718, Compensation-Stock Compensation, which requires that stock-based payments (to the extent they are compensatory) be recognized in our Consolidated Statements of Income based on their fair values. We account for forfeitures of stock-based awards as they occur. The expense for stock-based compensation is based on the grant date fair value of the award. The grant date fair value of restricted stock units (RSUs) isRSUs and PSUs are estimated as the value of the underlying shares of our common stock. The grant date fair value of stock-options isvalues are estimated using a Monte Carlo simulation pricing model for stock options that includecertain PSUs with market vesting conditions and a Black-Scholes Merton option pricing model for other stock options. Because there is a market for options onBoth option pricing models require the input of subjective assumptions. These variables include, but are not limited to, the expected volatility of our common stock we have consideredprice and the expected term of the awards. We consider both implied volatilities as well as ourand historical realized volatilitiesvolatility when developing an estimate of expected volatility. We estimate the term using historical data. We recognize compensation expense on an accelerated basis over the requisite service period on an accelerated basis for awards with a market or performance condition and on a straight-line basis over the requisite service period for all otherservice-based stock options and awards. Compensation expense relatingrelated to awards subject to performance conditionsPSUs is recognized when management determineswe determine that it is probable that the performance goals will be achieved; the probability of achievement is assessedachieved, which we assess on a quarterly basis. We have made an election to record forfeitures when they occur.
Foreign Currency Translation and Remeasurement
Monetary assets and liabilities denominated in currencies other than the functional currency are remeasured using exchange rates in effect at the end of the period and related gains or losses are recorded in Other, net. Gains and losses on the remeasurement of monetary assets and liabilities were not material for any of the years presented. We do not have any nonmonetary assets or liabilities denominated in currencies other than the U.S. dollar.
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Provision for Income Taxes
Our provision for income tax benefit (provision)taxes is computed under the asset and liability method. Significant estimates are required in determining our provision for income tax benefit (provision).taxes. Some of these estimates are based on interpretations of existing tax laws or regulations. We recognize deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial statements or tax returns. Under this method, deferred tax assets and liabilities are determined on the basis of the difference between the tax basis of assets and liabilities and their respective financial reporting amounts (temporary differences) at enacted tax rates in effect for the years in which the differences are expected to reverse. A valuation allowance is established for deferred tax assets for which it is more likely than not that some portion or all of the deferred tax assets, including net operating losses and tax credits, will not be realized. We periodically re-assess the need for a valuation allowance against our deferred tax assets based on various factors including our historical earnings experience by taxing jurisdiction, and forecasts of future operating results and utilization of net operating losses and tax credits prior to their expiration. Significant judgment is required in making this assessment and, to the extent that a reversal of any portion of our valuation allowance against our deferred tax assets is deemed appropriate, a tax benefit will be recognized against our provision for income tax provisiontaxes in the period of such reversal. Prior to 2018, we recorded a valuation allowance that fully offset our deferred tax assets. In the fourth quarter of 2018, based on our evaluation of various factors, including our achievement of a cumulative three-year income position as of December 28, 2018 and forecasts of future operating results, we released substantially all of our valuation allowance against our deferred tax assets and recorded a corresponding income tax benefit as described in “Note 8. Income Taxes”, below. We continue to maintain a valuation allowance against our California state deferred tax assets.
We recognize tax benefits from uncertain tax positions only if it is more likely than not that the tax position will be sustained upon examination by the tax authorities based on the technical merits of the position. An adverse resolution of one or more of these uncertain tax positions in any period could have a material impact on the results of operations for that period.
Recent Accounting Pronouncements Not Yet Adopted
In November 2018,There were no new accounting pronouncements issued since our filing of the Annual Report on Form 10-K for the year ended December 31, 2020, which could have a significant effect on our Consolidated Financial Accounting Standards Board (the FASB) issuedStatements.

NOTE 2. REVENUES
Revenues consisted of the following (in thousands):
 Year Ended December 31,
 202120202019
Product revenues:
Gross product revenues$1,452,913 $962,591 $957,621 
Discounts and allowances(375,657)(221,041)(197,671)
Net product revenues1,077,256 741,550 759,950 
Collaboration revenues:
License revenues249,956 167,295 165,914 
Collaboration services revenues107,758 78,693 41,911 
Total collaboration revenues357,714 245,988 207,825 
Total revenues$1,434,970 $987,538 $967,775 
Net product revenues and license revenues are recorded in accordance with ASC Topic 606, Revenue from Contracts with Customers (Topic 606). License revenues include the recognition of the portion of milestone payments allocated to the transfer of intellectual property licenses for which it had become probable in the current period that the milestone would be achieved and a significant reversal of revenues would not occur, as well as royalty revenues and our share of profits under our collaboration agreement with Genentech. Collaboration services revenues were recorded in accordance with ASU No. 2018-18,Collaborative Arrangements (Topic 808): Clarifying the Interaction between Topic 808 and Topic 606 (ASU 2018-18). ASU 2018-18 clarifies that certain transactions between collaborative arrangement participants should be accounted for as revenue under Topic 606 when the counterparty is a customer for a distinct good or service (i.e. a unit of account). For units of account that are in the scope of Topic 606, all of the guidance in Topic 606 should be applied, including the guidance on recognition, measurement, presentation and disclosure. ASU 2018-18 also adds a reference in Topic 808by analogy to the unit of account guidance in ASC 606 and requires that it be applied only to assess whether transactions in a collaborative arrangement are in the scope of Topic 606. ASU 2018-18 will preclude entities from presenting amounts related to transactions with a counterparty in a collaborative arrangement that is not a customer as revenue from contracts with customers. ASU 2018-18 is effective for us for all interim and annual reporting periods beginning after December 15, 2019. Early adoption is permitted. We are inCollaboration services revenues include the processrecognition of assessing the impact of ASU 2018-18 on our Consolidated Financial Statements.
In August 2018, the FASB issued ASU No. 2018-15, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (ASU 2018-15). ASU 2018-15 aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). Accordingly, ASU 2018-15 requires a customer in a hosting arrangement that is a service contract to follow the guidance in Subtopic 350-40 to determine which implementation costs to capitalize as an asset related to the service contract and which costs to expense. ASU 2018-15 also requires us to expense the capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement, which includes reasonably certain renewals. ASU 2018-15 is effective for us for all interim and annual reporting periods beginning after December 15, 2019. Early adoption is permitted. We are in the process of assessing the impact of ASU 2018-15 on our Consolidated Financial Statements.
In January 2017, the FASB issued ASU No. 2017-04, Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment, (ASU 2017-04). ASU 2017-04 eliminated Step 2 from the goodwill impairment test. Instead, under the amendments in ASU 2017-04, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An entity should recognize an impairment chargedeferred revenues for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amountportion of goodwillupfront and milestone payments allocated to that reporting unit. Additionally, an entity should consider income tax
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effects from any tax deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss, if applicable. ASU 2017-04 is effective for all interim and annual reporting periods beginning after December 15, 2019. Early adoption is permitted. We do not expect the adoption of ASU 2017-04 to have a material impact on our Consolidated Financial Statements.
NOTE 2. REVENUES
Revenues by disaggregated category were as follows (in thousands):
 Year Ended December 31,
 2018 2017 2016
Product revenues:     
Gross product revenues$738,529
 $402,569
 $151,499
Discounts and allowances(119,250) (53,561) (16,124)
Net product revenues619,279
 349,008
 135,375
Collaboration revenues:     
License revenues (1)
192,188
 96,637
 56,286
Research and development service revenues (2)
39,501
 8,737
 
Other collaboration revenues (3)
2,858
 (1,905) (207)
Total collaboration revenues234,547
 103,469
 56,079
Total revenues$853,826
 $452,477
 $191,454
____________________
(1)Upon the adoption of Topic 606 as of January 1, 2018, the allocation of proceeds from our collaboration partners, including upfront and milestone payments, between intellectual property licenses and research and development services as well as the resulting timing of recognition have changed. License revenues for the year ended December 31, 2018 included the immediate recognition of the portion of milestones that were allocated to the transfer of intellectual property licenses for those milestones for which it had become probable that a significant revenue reversal would not occur, as well as royalty revenues from Ipsen and Genentech. License revenues for the years ended December 31, 2017 and 2016 included the full recognition of substantive milestones achieved during the period, recognition of deferred revenues from upfront payments and a non-substantive milestone, which were being amortized over various periods, as well as royalty revenues from Ipsen and Genentech.
(2)Research and development service revenues for the year ended December 31, 2018 included the recognition of deferred revenue for the portion of the upfront and milestone payments that have been allocated to the research and development service performance obligations which are being amortized through early 2030, as well as development cost reimbursements earned on our collaboration agreements. As described above, prior to the adoption of Topic 606, we did not allocate any of our upfront payments or milestones to research and development services; therefore, Research and development service revenues for the years ended December 31, 2017 included only development cost reimbursements earned on our collaboration agreements.
(3)Other collaboration revenues for the year ended December 31, 2018 included royalties we paid to GSK on Ipsen’s sales of products containing cabozantinib, the profit on the U.S. commercialization of COTELLIC from Genentech and product supply revenues. Other collaboration revenues for the years ended years ended December 31, 2017 and 2016 included only royalties we paid to GSK on Ipsen’s sales of products containing cabozantinib and product supply revenues, as the profits and losses on the U.S. commercialization of COTELLIC for the period were included in Selling, general and administrative expenses.
During the year ended December 31, 2018, Net product revenues and License revenues related to goods and intellectual property licenses transferred at a point in time and Research and development services performance obligations, development cost reimbursements earned under our collaboration agreements, product supply revenues, related to services performed over time. License revenuesnet of product supply costs, and Research and development services revenues were recorded in accordance with Topic 606 during 2018 and Topic 605 in prior periods. Other collaboration revenues, which includedthe royalties we paid to GSK on Ipsen’s sales of products containing cabozantinib the profitby our collaboration partners. We received notification that, effective January 1, 2021, Royalty Pharma plc (Royalty Pharma) acquired from GlaxoSmithKline (GSK) all rights, title and interest in royalties on the U.S. commercializationtotal net sales of COTELLIC from Genentech andany product supply revenue, were recorded in accordance with Topic 808containing cabozantinib for all periods presented.non-U.S. markets
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for the full term of the royalty and for the U.S. market through September 2026, after which time U.S. royalties will revert back to GSK.
Net product revenues disaggregated by product were as follows (in thousands):
Year Ended December 31,
202120202019
CABOMETYX$1,054,050 $718,687 $733,421 
COMETRIQ23,206 22,863 26,529 
Net product revenues$1,077,256 $741,550 $759,950 
 Year Ended December 31,
 2018 2017 2016
CABOMETYX$599,946
 $324,000
 $93,481
COMETRIQ19,333
 25,008
 41,894
Net product revenues$619,279
 $349,008
 $135,375
The percentage of total revenues by customer who individually accounted for 10% or more of our total revenues were as follows:
 Year Ended December 31,
 202120202019
Ipsen Pharma SAS21 %15 %16 %
Affiliates of CVS Health Corporation14 %14 %15 %
Affiliates of McKesson Corporation14 %12 %12 %
Affiliates of AmerisourceBergen Corporation14 %11 %11 %
Affiliates of Optum Specialty Pharmacy%11 %13 %
As of December 31, 2021 and 2020, the percentage of trade receivables by customer who individually accounted for 10% or more of our trade receivables were as follows:
 December 31,
 20212020
Ipsen Pharma SAS50 %23 %
Affiliates of AmerisourceBergen Corporation11 %11 %
Affiliates of McKesson Corporation10 %12 %
Affiliates of CVS Health Corporation%11 %
Takeda Pharmaceutical Company Limited%10 %
Total revenues disaggregated by significant customer were as follows (dollars in thousands):
 Year Ended December 31,
 2018 2017 2016
 Dollars Percent of total Dollars Percent of total Dollars Percent of total
Ipsen$182,879
 21% $69,792
 15% $33,252
 17%
Caremark L.L.C.110,698
 13% 73,921
 16% 17,746
 9%
Affiliates of McKesson Corporation99,916
 12% 48,662
 11% 13,143
 7%
Accredo Health, Incorporated81,028
 9% 50,716
 11% 16,631
 9%
Diplomat Specialty Pharmacy74,244
 9% 83,059
 18% 63,826
 33%
Others, individually less than 10% of Total revenues for all periods presented305,061
 36% 126,327
 29% 46,856
 25%
Total revenues$853,826
 100% $452,477
 100% $191,454
 100%
Total revenues disaggregated by geographic region were as follows (in thousands):
Year Ended December 31,
202120202019
U.S.$1,089,396 $752,890 $770,244 
Europe302,073 151,631 152,771 
Japan43,501 83,017 44,760 
Total revenues$1,434,970 $987,538 $967,775 
 Year Ended December 31,
 2018 2017 2016
U.S.$632,927
 $367,906
 $140,709
Europe182,879
 69,792
 35,745
Rest of the world38,020
 14,779
 15,000
Total revenues$853,826
 $452,477
 $191,454
NetTotal revenues include net product revenues are attributed to geographic regions based on the ship-to location. Collaborationlocation and license and collaboration services revenues are attributed to geographic regions based on the location of our collaboration partners’ headquarters.
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Product Sales Discounts and Allowances
The activities and ending reserve balances for each significant category of discounts and allowances (which constitute variable consideration) were as follows (in thousands):
Chargebacks, Discounts for Prompt Payment and OtherOther Customer Credits/Fees and Co-pay AssistanceRebatesTotal
Balance at December 31, 2019$7,514 $3,497 $15,222 $26,233 
Provision related to sales made in:
Current period146,537 16,162 58,049 220,748 
Prior periods33 (352)612 293 
Payments and customer credits issued(144,231)(16,028)(56,479)(216,738)
Balance at December 31, 20209,853 3,279 17,404 30,536 
Provision related to sales made in:
Current period243,119 30,728 100,361 374,208 
Prior periods(64)(111)1,624 1,449 
Payments and customer credits issued(238,283)(25,021)(94,564)(357,868)
Balance at December 31, 2021$14,625 $8,875 $24,825 $48,325 
 Chargebacks and Discounts for Prompt Payment Other Customer Credits/Fees and Co-pay Assistance Rebates Returns Total
Balance at December 31, 2016$1,802
 $794
 $2,627
 $351
 $5,574
Provision related to sales made in:         
Current period33,310
 7,301
 14,390
 
 55,001
Prior periods(817) 
 (624) 
 (1,441)
Payments and customer credits issued(32,367) (6,300) (10,623) (351) (49,641)
Balance at December 31, 20171,928
 1,795
 5,770
 
 9,493
Provision related to sales made in:         
Current period75,543
 13,015
 31,040
 2
 119,600
Prior periods(403) 206
 (153) 
 (350)
Payments and customer credits issued(74,746) (11,978) (24,741) (2) (111,467)
Balance at December 31, 2018$2,322
 $3,038
 $11,916
 $
 $17,276
Chargebacks andThe allowance for chargebacks, discounts for prompt payment and other are recorded as a reduction of Tradetrade receivables, net, and the remaining reserve balancesreserves are classifiedrecorded as Other current liabilitiesrebates and fees due to customers in the accompanying Consolidated Balance Sheets.
Contract Assets and Liabilities
We receive payments from our licenseescollaboration partners based on billing schedules established in each contract. Amounts are recorded as accounts receivable when our right to consideration is unconditional. Upfront and milestone payments may require deferral of revenue recognition to a future period until we perform our obligations under these arrangements and are recorded as deferred revenue upon receipt or when due. We may also recognize revenue in advance of the contractual billing schedule and such amounts are recorded as unbilled collaboration revenuea contract asset when recognized. Changes inWe may be required to defer recognition of revenue for upfront and milestone payments until we perform our obligations under these arrangements, and such amounts are recorded as deferred revenue upon receipt or when due. For those contracts that have multiple performance obligations, contract assets and liabilities under Topic 606are reported on a net basis at the contract level. Contract assets as of December 31, 2021 are primarily related to contract assets from Ipsen Pharma SAS (Ipsen) and contract liabilities as of December 31, 2021 are primarily related to deferred revenues from Takeda Pharmaceutical Company Limited (Takeda).
Contract assets and liabilities were as follows (in thousands):
 Contract Assets: Unbilled Collaboration Revenue Contract Liabilities: Deferred Revenue
 Current Portion Long-term Portion Current Portion Long-term Portion
Balance at December 31, 2017$
 $
 $31,984
 $238,520
Adoption of Topic 6069,588
 12,247
 (23,591) (213,079)
Balance at January 1, 20189,588
 12,247
 8,393
 25,441
Increases as a result of a change in transaction price and recognition of revenues as services are performed37,881
 4,545
 
 
Transfer to receivables from contract assets recognized at the beginning of the period(46,052) 
 
 
Increases as a result of the deferral of milestones achieved in period, excluding amounts recognized as revenue
 
 1,718
 7,237
Revenue recognized that was included in the contract liability balance at the beginning of the period
 
 (8,683) 
Other adjustments (1)
(1,417) (16,792) (1,428) (16,781)
Balance at December 31, 2018$
 $
 $
 $15,897
 December 31,
 20212020
Contract assets(1)
$1,665 $— 
Contract liabilities:
Current portion(2)
$7,814 $1,790 
Long-term portion(3)
8,739 3,755 
Total contract liabilities$16,553 $5,545 
____________________
(1)Includes reclassification of deferred revenue from long-term to current and adjustments made due to netting of contract assets and liabilities by collaboration agreement.
(1)    Presented in other long-term assets in the accompanying Consolidated Balance Sheets.
(2)    Presented in other current liabilities in the accompanying Consolidated Balance Sheets.
(3)    Presented in the long-term portion of deferred revenues in the accompanying Consolidated Balance Sheets.
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During the yearyears ended December 31, 2018,2021, 2020 and 2019, we recognized $198.1$8.5 million, $9.2 million and $6.5 million, respectively, in revenues under Topic 606that were included in the beginning deferred revenues balance for those years.
During the years ended December 31, 2021, 2020 and 2019, we recognized $148.7 million, $169.7 million and $161.2 million, respectively, in revenues for performance obligations satisfied in previous periods. Such revenues were primarily related to milestone and royalty payments allocated to our license performance obligations offor our collaborations with Ipsen Pharma SAS (Ipsen), Takeda, Daiichi Sankyo and Daiichi Sankyo.Genentech.
As of December 31, 2021, $87.5 million of the combined transaction prices for our Ipsen and Takeda collaborations were allocated to performance obligations that had not yet been satisfied. See “Note 3. Collaboration Agreements— Cabozantinib Collaborations —Performance Obligations and Transaction Prices for our Ipsen and Takeda Collaborations” for additional information about the expected timing to satisfy these performance obligations.

NOTE 3. COLLABORATION AGREEMENTS AND BUSINESS DEVELOPMENT ACTIVITIES
We have established multiple collaborations with leading pharmaceuticalbiopharmaceutical companies for the commercialization and further development of our cabozantinib as well as with smaller, discovery-focused biotechnology companiesfranchise. Additionally, we have made considerable progress under our existing research collaboration and in-licensing arrangements to further enhance our early-stage pipeline and expand our product pipeline. Additionally, in lineability to discover, develop and commercialize novel therapies with our business strategy prior to the commercializationgoal of our first product, COMETRIQ,providing new treatment options for cancer patients and their physicians. Historically, we also entered into other collaborations with leading pharmaceuticalbiopharmaceutical companies including Genentech, Daiichi Sankyo, Merck & Co., Inc. (Merck) and Bristol-Myers Squibb Company (BMS) forpursuant to which we out-licensed other compounds and programs in our portfolio.
Under these collaborations, we are generally entitled to receive milestone and royalty payments, and for certain collaborations, to receive payments for product supply services, development cost reimbursements, and/or profit sharingprofit-sharing payments. See “Note 2. Revenues” for additional information on collaboration revenues recognized under our collaboration agreements during the years ended December 31, 2018, 20172021, 2020 and 2016.2019.
CabozantinibCommercial Collaborations
Ipsen Collaboration
Description of the Collaboration
In February 2016, we entered into a collaboration and license agreement with Ipsen for the commercialization and further development of cabozantinib. Pursuant to the terms ofUnder the collaboration agreement, as amended, Ipsen received exclusive commercialization rights for current and potential future cabozantinib indications outside of the U.S., Canada and Japan. The collaboration agreement was subsequently amended in December 2016 to include commercialization rights in Canada. We have also agreed to collaborate with Ipsen on the development of cabozantinib for current and potential future indications. The parties’ efforts are governed through a joint steering committee and appropriate subcommittees established to guide and oversee the collaboration’s operation and strategic direction; provided, however, that we retain final decision-making authority with respect to cabozantinib’s ongoing development.
During the second quarter of 2021, Ipsen opted into and is now co-funding the development costs for COSMIC-311, our phase 3 pivotal trial evaluating cabozantinib versus placebo in patients with RAI-refractory DTC who have progressed after up to two VEGF receptor-targeted therapies. Under the collaboration agreement, Ipsen is now obligated to reimburse us for their share of COSMIC-311 global development costs, as well as an additional payment calculated as a percentage of such costs, triggered by the timing of the exercise of its option. We determined that the decision to opt in and co-fund the development costs for COSMIC-311 represented a contract modification for additional distinct services at their standalone selling price and therefore was treated as a separate contract under Topic 606. Accordingly, collaboration services revenues for the year ended December 31, 2021, includes a cumulative catch-up of $43.2 million for Ipsen’s share of global development costs incurred since the beginning of the study and through the opt-in date.
Unless earlier terminated, earlier, the collaboration agreement has a term that continues, on a product-by-product and country-by-country basis, until the latter of (i)(1) the expiration of patent claims related to cabozantinib, (ii)(2) the expiration of regulatory exclusivity covering cabozantinib or (iii)(3) ten years after the first commercial sale of cabozantinib, other than COMETRIQ. A related supply agreement will continue in effect until expiration or termination of the collaboration agreement. The collaboration agreement may be terminated for cause by either party based on uncured material breach of either the collaboration agreement or the supply agreement by the other party, bankruptcy of the other party or for safety
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reasons. We may terminate the collaboration agreement if Ipsen challenges or opposes any patent covered by the collaboration agreement. Ipsen may terminate the collaboration agreement if the FDA or European Medicines Agency (EMA) orders or requires substantially all cabozantinib clinical trials to be terminated. Ipsen also has the right to terminate the collaboration agreement on a region-by-region basis after the first commercial sale of cabozantinib in advanced RCC in the given region. Upon termination by either party, all licenses granted by us to Ipsen will automatically terminate, and, except in the event of a termination by Ipsen for our material breach, the licenses granted by Ipsen to us shall survive such termination and shall automatically become worldwide, or, if Ipsen were to terminate only for a particular region, then for the terminated region. Following termination by us for Ipsen’s material breach, or termination by Ipsen without cause or because we undergo a change of control by a party engaged in a competing program, Ipsen is prohibited from competing with us for a period of time.
Consideration under the Collaboration
In consideration for the exclusive license and other rights contained in the collaboration agreement, including commercialization rights in Canada, Ipsen paid uswe received aggregate upfront payments of $210.0 million.million from Ipsen in 2016. As of December 31, 2018,2021, we have also achieved aggregate milestones of $275.0$462.5 million related to regulatory, development regulatory and commercial progresssales-based threshold by Ipsen since the inception of the collaboration agreement, including $140.0$112.5 million, $20.0 million and $55.0 million in milestones recognizedachieved during 2018.the years ended December 31, 2021, 2020 and 2019, respectively.
WeAs of December 31, 2021, we are also eligible to receive futureadditional regulatory and development and regulatory milestone payments from Ipsen totaling an aggregate of $84.0$46.5 million, upon additional approvals of cabozantinib in future indications and/or jurisdictions, as well as contingentsales-based milestones, including milestone payments earned for the first commercial sale of a product, of up to $519.5$350.0 million associatedand CAD$26.5 million. We excluded these milestones from the transaction price as of December 31, 2021 because we determined such payments to be fully constrained under Topic 606 due to the fact that it was not probable that a significant reversal of cumulative revenue would not occur, given the inherent uncertainty of success with sales-basedthese milestones. We will further adjust the constraint applied to the variable consideration at each reporting period as uncertain events are resolved or other changes in circumstances occur. As of December 31, 2021, $44.2 million of the transaction price allocated to our research and development services performance obligation had not been satisfied. See “—Performance Obligations and Transaction Prices for our Ipsen and Takeda Collaborations”, below, for additional information related to the revenue recognition for this collaboration.

We also receive royaltiesroyalty revenues on the net sales of cabozantinib by Ipsen outside of thethe U.S. and Japan. We were initially entitled to receive a tiered royalty of 2% to 12% onDuring the initial $150.0 million of net sales; this amount was reached in the second quarter of 2018. As ofyear ended December 31, 20182021 and going forward, we are entitled to receive a tiered royalty of 22% to 26% on annual net sales, (withwith separate tiers for Canada);Canada; these 22% to 26% royalty tiers reset each calendar year. In Canada, we
Any variable consideration related to royalties and sales-based milestones will be recognized when the related sales occur as these amounts have been determined to relate to the relevant transferred license and therefore are entitled to receive a tiered royalty ofrecognized as the related sales occur.
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22% on the first CAD$30.0 million of annual net sales and a tiered royalty thereafter to 26% on annual net sales; these 22% to 26% royalty tiers for Canada will also reset each calendar year.
Consistent with our historical agreement with GSK, weWe are required to pay a 3% royalty to GSK on all net sales of any product incorporating cabozantinib, including net sales by Ipsen.
We are primarily responsible for funding cabozantinib-related development costs for those trials in existence at the time we entered into the collaboration agreement with Ipsen; global development costs for additional trials are shared between the parties, with Ipsen reimbursing us for 35% of such costs, provided Ipsen chooses to opt into such trials. Ipsen has opted into and is co-funding certain clinical trials, including: CheckMate -9ER, COSMIC-021, COSMIC-311, COSMIC-312, CONTACT-01 and CONTACT-02.
We areremain responsible for the manufacturemanufacturing and supply of cabozantinib for all development and commercialization activities under the collaboration agreement. In connection with the collaboration agreement,Relatedly, we entered into a supply agreement with Ipsen to supply finished, labeled drug product to Ipsen for distribution in the territories outside of the U.S. and Japan for the term of the collaboration agreement. The product will beis supplied at our cost, as defined in the agreement.
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Revenues from the Collaboration
Collaboration revenuesRevenues under the collaboration agreement with Ipsen were as follows (in thousands):
 Year Ended December 31,
 202120202019
License revenues$207,982 $93,495 $117,360 
Collaboration services revenues94,091 58,136 35,411 
Total$302,073 $151,631 $152,771 
 Year Ended December 31,
 2018 2017 2016
Ipsen collaboration revenues$182,879
 $69,792
 $33,252
As ofMilestone revenues for the year ended December 31, 2018, $48.02021 included $100.0 million related to a commercial sales milestone from Ipsen upon their achievement of $400.0 million of the transaction price allocated to our research and development services performance obligation had not been satisfied. Asnet sales of December 31, 2018, the net contract liability for the collaboration agreement with Ipsen was $13.3 million, which was included in Long-term portion of deferred revenuecabozantinib in the accompanying Consolidated Balance Sheets. See “—Performance Obligationsrelated Ipsen license territory over four consecutive quarters and Transaction Prices for our Ipsen and Takeda Collaborations”, below, for additional information relateda $12.5 million regulatory milestone achieved upon submission of a variation application to the revenue recognitionEMA for this collaboration.CABOMETYX as a treatment for patients with previously treated RAI-refractory DTC.
Takeda Collaboration
Description of the Collaboration
In January 2017, we entered into a collaboration and license agreement with Takeda, which was subsequently amended effective March 2018, May 2019 and September 2020, to, among other things, modify the amount of reimbursements we receive, for costs associated with our required pharmacovigilance activities and milestones we are eligible to receive, as well as modify certain cost-sharing obligations related to the Japan-specific development costs associated with CONTACT-01 and CONTACT-02. We determined the amendment in September 2020 represented a contract modification that was treated as a termination of an existing contract and the creation of a new contract under Topic 606. As a result, we allocated the remaining transaction price to the performance obligations identified in the contract. The two remaining performance obligations are the research and development services associated with committed studies and the research and development services associated with CONTACT-01, CONTACT-02, and certain cohorts of COSMIC-021 studies. In allocating the transaction price for the modified contract we estimated the standalone selling price for the performance obligations. We utilized development costs incurred for these obligations in process and the projections of costs through the term of the arrangement. Revenue is recognized when, or as, we satisfy our performance obligations by transferring the promised services to Takeda. PursuantRevenue is being recognized using the cost proportional performance method, based on costs incurred to thisperform the research and development services, since the level of costs incurred over time is thought to best reflect the transfer of services to Takeda.
Takeda is responsible for a portion of the costs associated with the cabozantinib development plan’s current and future trials, provided Takeda opts into such trials, and 100% of costs associated with the cabozantinib development activities that are exclusively for the benefit of Japan. Takeda has opted into and is co-funding CheckMate -9ER, certain cohorts of COSMIC-021, CONTACT-01 and CONTACT-02. Under the collaboration agreement, as amended, Takeda has exclusive commercialization rights for current and potential future cabozantinib indications in Japan, and the parties have agreed to collaborate on the clinical development of cabozantinib in Japan. The operation and strategic direction of the parties’ collaboration is governed through a joint executive committee and appropriate subcommittees.
Unless earlier terminated, the collaboration agreement has a term that continues, on a product-by-product basis, until the earlier of (i)(1) two years after first generic entry with respect to such product in Japan or (ii)(2) the later of (A) the expiration of patent claims related to cabozantinib and (B) the expiration of regulatory exclusivity covering cabozantinib in Japan. The collaboration agreement may be terminated for cause by either party based on uncured material breach by the other party, bankruptcy of the other party or for safety reasons. For clarity, Takeda’s failure to achieve specified levels of commercial performance, based upon sales volume and/or promotional effort, during the first six years of the collaboration shallwill constitute a material breach of the collaboration agreement. We may terminate the agreement if Takeda challenges or opposes any patent covered by the collaboration agreement. At any time prior to August 1, 2023, the parties may mutually agree to terminate the collaboration agreement if Japan’s Pharmaceuticals and Medical Devices Agency is unlikely to grant any approval of the marketing authorization application in any cancer indication in Japan. After the commercial launch of cabozantinib in Japan, Takeda may terminate the collaboration agreement upon twelve months’ prior written notice following the third anniversary of the first commercial sale of cabozantinib in Japan. Upon termination by either party, all licenses granted by us to Takeda will automatically terminate, and the licenses granted by Takeda to us shall survive such termination and shall automatically become worldwide.
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Consideration under the Collaboration
In consideration for the exclusive license and other rights contained in the collaboration agreement, we received aan upfront payment of $50.0 million upfront nonrefundable payment from Takeda. During the year ended December 31, 2018, we also achieved a $10.0 million development related milestone.
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Takeda in 2017. As of December 31, 2018,2021, we werehave also achieved regulatory and development milestones in the aggregate of $127.0 million since the inception of the collaboration agreement, including $35.0 million, $66.0 million and $16.0 million in milestones achieved during the years ended December 31, 2021, 2020 and 2019, respectively.
Under the collaboration agreement, as amended in 2020, we are eligible to receive development,additional regulatory and first-saledevelopment milestone payments, of up to $90.0 million related to second-line RCC, first-line RCC and second-line HCC, as well as additional development, regulatory and first-sale milestone payments, without contractual limit, for additional potential future indications. The collaboration agreement also provides that weWe are further eligible to receive pre-specifiedcommercial milestones, including milestone payments earned for the first commercial sale of a product, of up to $83.0 million associated$119.0 million. We excluded these milestones from the transaction price as of December 31, 2021 because we determined such payments to be fully constrained under Topic 606 due to the fact that it was not probable that a significant reversal of cumulative revenue would not occur, given the inherent uncertainty of success with sales volume milestones andthese milestones. We will adjust the constraint applied to the variable consideration at each reporting period as uncertain events are resolved or other changes in circumstances occur.
We also receive royaltiesroyalty revenues on the net sales of cabozantinib in Japan. We are entitled to receive a tiered royalty of 15% to 24% on the initial $300.0 million of net sales, and following this initial $300.0 million of net sales, we are then entitled to receive a tiered royalty of 20% to 30% on annual net sales thereafter; these 20% to 30% royalty tiers will reset each calendar year. Any variable consideration related to royalties and sales-based milestones will be recognized when the related sales occur as these amounts have been determined to relate to the relevant transferred license and therefore are recognized as the related sales occur.
Consistent with our historical agreement with GSK, weWe are required to pay a 3% royalty to GSK on all net sales of any product incorporating cabozantinib, including net sales by Takeda.
Takeda is responsible for 20% ofUnder the costs associated with the global cabozantinib development plan’s current and future trials, provided Takeda opts into such trials, and 100% of costs associated with the cabozantinib development activities that are exclusively for the benefit of Japan.
Wecollaboration agreement, we are responsible for the manufacturemanufacturing and supply of cabozantinib for all development and commercialization activities under the collaboration and consequently,agreement. Additionally, we entered into a clinical supply agreement covering the supply of cabozantinib to Takeda for the term of the collaboration agreement, as well as a quality agreement that provides respective quality responsibilities for the aforementioned supply. Furthermore, at the time we entered into the collaboration agreement, the parties also entered into a safety data exchange agreement, which defines each partner’s responsibility for safety reporting. This agreement also requires us to maintain the global safety database for cabozantinib. To meet our obligations to regulatory authorities for the reporting of safety data from Japan from sources other than our sponsored global clinical development trials, we rely on data collected and reported to us by Takeda.
Revenues from the Collaboration
Collaboration services revenues under the collaboration agreement with Takeda were as follows (in thousands):
 Year Ended December 31,
 202120202019
License revenues$26,058 $61,115 $18,112 
Collaboration services revenues13,667 20,557 6,510 
Total collaboration revenues$39,725 $81,672 $24,622 
 Year Ended December 31,
 2018 2017
Takeda collaboration revenues$18,020
 $14,779
Milestone revenues for the year ended December 31, 2021 included $18.9 million recognized in connection with a $20.0 million milestone we achieved upon Takeda’s first commercial sale in Japan of CABOMETYX in combination with OPDIVO for the treatment of patients with unresectable, advanced or metastatic RCC.
As of December 31, 2018, $25.62021, $43.3 million of the transaction price was allocated to our research and development services performance obligation hadobligations that have not yet been satisfied. As of December 31, 2018, the net contract liability for the collaboration agreement with Takeda was $2.6 million, which was included in Long-term portion of deferred revenue in the accompanying Consolidated Balance Sheets.
Performance Obligations and Transaction Prices for our Ipsen and Takeda Collaborations
We identified two performance obligations for both the Ipsen and Takeda collaboration agreements:agreement: (1) the transfer of an exclusive license for the commercialization and further development of cabozantinib; and (2) research and development services,
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which includes certain committed studies for the development of cabozantinib, pharmacovigilance services and participation on various joint committees (as defined in the specific collaboration agreements).
We identified two remaining performance obligations for the Takeda collaboration agreement due to the amendment in September 2020: (1) research and development services, which includes certain committed studies for the development of cabozantinib, pharmacovigilance services and participation on various joint committees (as defined in the specific collaboration agreements). and (2) the research and development services associated with CONTACT-01, CONTACT-02, and certain cohorts of COSMIC-021 studies. As part of the original contract, we had a performance obligation associated with the exclusive license for the commercialization and further development of cabozantinib, which was transferred in 2017.
We have allocated the transaction price for each of these collaborations which are described below, to the identified performance obligations based on our best estimate of their relative standalone selling price. For the licenses, the estimate of the relative standalone selling price was determined using a discounted cash flow valuation utilizing forecasted revenues and costs, and a discount rate.costs. For research and development services the estimate of the relative standalone selling price was determined using an adjusted market assessment approach that relies on internal and external costs and market factors.
The portion of the transaction price allocated to our license performance obligation areis recorded immediately as our license represents functional intellectual property that was transferred at a point in time. The portion of the transaction price allocated to our research and development services performance obligation is being recognized as revenue using the inputs method based on our internal development projected cost estimates through the current estimated patent expiration of cabozantinib in the European Union (EU) for the Ipsen Collaboration and Japan for the Takeda Collaboration, both of which are early 2030.
Based on our evaluation ofWe adjust the collaboration agreements as of January 1, 2018, the date adoption of Topic 606, we determined that for both agreements, the up-front, nonrefundable payments, the milestones and royalties achieved as of December 31, 2017, and our estimate for the reimbursements of our research and development services performance obligation over the term of each agreement constituted the amount of the consideration to be included in the transaction
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price as of December 31, 2017. In addition, the transaction price for the Ipsen collaboration agreement included a $10.0 million milestone we expected to achieve during the three months ended March 31, 2018. Other than that $10.0 million milestone, variable consideration for both agreements related to regulatory and development milestones not previously recognized was constrained dueconstraint applied to the fact that it was not probable that a significant reversal of cumulative revenue would not occur, given the inherent uncertainty of success with these milestones. Any variable consideration related to sales-based milestones and royalties will be recognized when the related sales occur as these amounts have been determined to relate to the relevant transferred license and therefore are recognized as the related sales occur.
We re-evaluate the transaction price for the collaboration agreements in each reporting period as uncertain events are resolved or other changes in circumstances occur and we allocate those changes in the transaction price between our performance obligations. During the yearyears ended December 31, 2018,2021, 2020 and 2019, the transaction price of the Ipsen and Takeda collaboration agreements increased as a result of the achievement of various milestones, described above.and the reimbursements of research and development services related to committed and opt-in studies. We further updated the transaction price based upon the impact ofactual research and development services performed during the period and changes in our estimated reimbursements for our future research and development services. The portion of the increase in transaction price that was allocated to the previously satisfied performance obligations for the transfer of an intellectual property license was recognized during the period and the portion allocated to research and development services will be recognized in future periods as those services are delivered through early 2030. As of December 31, 2018,2021, variable consideration related to the remaining unearned regulatory and development milestones for both agreements remained constrained due to the fact that it was not probable that a significant reversal of cumulative revenue would not occur.
Cabozantinib Development Collaborations
BMS

In February 2017, we entered into a clinical trial collaboration agreement with BMS for the purpose of exploring the therapeutic potential of cabozantinib in combination with BMS’s immune checkpoint inhibitors (ICIs), nivolumab and/or ipilimumab, to treat a variety of types of cancer. As part of the collaboration, we are evaluating these combinationsthe triplet combination of cabozantinib, nivolumab and ipilimumab as a treatment optionsoption for RCC and HCC in the CheckMate 9ER and CheckMate 040 trials, respectively.
Pursuant to the terms ofCOSMIC-313 trial. Under the collaboration agreement with BMS, we may also evaluate these combinations in other phase 3 pivotal trials in various other tumor types.
Under the collaboration agreement with BMS, as subsequently amended effective March 2019, May 2019 and November 2019, each party granted to the other a non-exclusive, worldwide (within the collaboration territory as defined in the collaboration agreement and its supplemental agreements), non-transferable, royalty-free license to use the other party’s compounds in the conduct of each clinical trial.
The parties’ efforts are governed through a joint development committee established to guide and oversee the collaboration’s operation. Each trial is conducted under a combination Investigational New Drug application, unless otherwise required by a regulatory authority. Each party will beis responsible for supplying finished drug product for the applicable clinical trial, and unless otherwise agreed betweenresponsibility for the parties,payment of costs for each such trial will be shared equally between the parties, unless two BMS compounds will be utilized in such trial, in which case BMS will bear two-thirds of the costs for such study treatment arms and we will bear one-third of the costs.determined on a trial-by-trial basis. Unless earlier terminated, the collaboration agreement will remain in effect until the completion of all clinical trials under the collaboration, all related trial data has been delivered to both parties and the completion of any then agreed upon analysis. The collaboration agreement may be terminated for cause by either party
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based on uncured material breach by the other party, bankruptcy of the other party or for safety reasons. Upon termination by either party, the licenses granted to each party to conduct a combined therapy trial will terminate.
TheF. Hoffmann-La Roche GroupLtd. (Roche) Collaboration
In February 2017, we entered into a master clinical supply agreement with Roche for the purpose of evaluating cabozantinib in combination withand Roche’s ICI, atezolizumab, in locally advanced or metastatic solid tumors. As part ofUnder this agreement with Roche, in June 2017, we initiated COSMIC-021, a phase 1b trialdose escalation study that is evaluating the safety and tolerability of thecabozantinib in combination with Roche’s atezolizumab in patients with locally advanced or metastatic solid tumors, and in December 2018, we initiated COSMIC-312, a multicenter, randomized, controlled phase 3 pivotal trial evaluating thecabozantinib in combination with atezolizumab versus sorafenib in previously untreated advanced HCC, with an exploratory arm also evaluating cabozantinib monotherapy in previously untreated advanced HCC. We are the trial sponsor of both trials, and Roche is providing atezolizumab free of charge.
In December 2019, we entered into a joint clinical research agreement with Roche for the purpose of further evaluating the combination of cabozantinib with atezolizumab in patients with locally advanced or metastatic solid tumors, including in the phase 3 pivotal clinical trials in advanced non-small cell lung cancer (CONTACT-01), metastatic castration-resistant prostate cancer (CONTACT-02) and RCC (CONTACT-03). If a party to the joint clinical research agreement proposes any additional combined therapy trials beyond these phase 3 pivotal trials, the joint clinical research agreement provides that such proposing party must notify the other party and that if agreed to, any such additional combined therapy trial will become part of the collaboration, or if not agreed to, the proposing party may conduct such additional combined therapy trial independently, subject to specified restrictions set forth in the joint clinical research agreement.

In July 2020, a supplement to the joint clinical research agreement was signed amongst us, Roche and Takeda due to Takeda opting into fund the combined therapy trial of CONTACT-01 sponsored by Roche. Chugai was added as an affiliate of Roche.All parties including Chugai conduct combined therapy trials in Japan upon the terms of the joint clinical research agreement.
Under the joint clinical research agreement, each party granted to the other a non-exclusive, worldwide (excluding, in our case, territory already the subject of a license by us to Takeda), non-transferable, royalty-free license, with a right to sublicense (subject to limitations), to use the other party’s intellectual property and compounds solely as necessary for the party to perform its obligations under the joint clinical research agreement. The parties’ efforts will be governed through a joint steering committee established to guide and oversee the collaboration and the conduct of the combined therapy trials. Each party will be responsible for providing clinical supply of their drug for all combined therapy trials, and the cost of the supply will be borne by such party. The clinical trial expenses for each combined therapy trial agreed to be conducted jointly under the joint clinical research agreement will be shared equally between the parties, and the clinical trial expenses for each additional combined therapy trial not agreed to be conducted jointly under the joint clinical research agreement will be borne by the proposing party, except that the cost of clinical supply for all combined therapy trials will be borne by the party that owns the applicable product.
We determined the contract is within the scope of Topic 808 as it involves joint operating activities where both parties have active participation in the arrangement and are exposed to significant risks and rewards. Payments between us and Roche under this arrangement are not subject to other accounting literature. Payments due to Roche for our share of clinical trial costs incurred by Roche will be recorded as research and development expense and payments due from Roche for their share of clinical trial costs incurred by us will be recorded as a reduction of research and development expense.
Unless earlier terminated, the joint clinical research agreement provides that it will remain in effect until the completion of all combined therapy trials under the collaboration, the delivery of all related trial data to both parties, and the completion of any then agreed-upon additional analyses. The joint clinical research agreement may be terminated for cause by either party based on any uncured material breach by the other party, bankruptcy of the other party or for safety reasons. Upon termination by either party, the licenses granted to each party will terminate upon completion of any ongoing activities under the joint clinical research agreement.
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GSK and Royalty Pharma
In October 2002, we established a product development and commercialization collaboration agreement with GSK. Under the terms of the collaboration agreement, GSK, had the rightthat required us to choose cabozantinib for further development and commercialization, but notified us in October 2008 that it had waived its right to select the compound for such activities. Although the collaboration agreement was terminated during 2014, GSK continues to be entitled topay a 3% royalty we are required to payGSK on allthe total worldwide net sales of any product incorporating cabozantinib by us and our collaboration partners. Royalties
TableAs disclosed in Note 2, we received notification that, effective January 1, 2021, Royalty Pharma acquired from GSK all rights, title and interest in royalties on total net sales of Contents

accruingany product containing cabozantinib for non-U.S. markets for the full term of the royalty and for U.S. market through September 2026, after which time U.S. royalties will revert back to GSK. Royalty revenues earned by GSK and Royalty Pharma in connection with theour sales of cabozantinib are included in Costcost of goods sold for sales by us and as a reduction of Collaborationcollaboration services revenues for sales by Ipsen.our collaboration partners. Such royaltiesroyalty revenues were as follows (in thousands):
 Year Ended December 31,
 2018 2017 2016
Royalties accruing to GSK$23,950
 $12,413
 $4,334
StemSynergyTherapeutics, Inc. (StemSynergy) Collaboration
In January 2018, we entered into an exclusive collaboration and license agreement with StemSynergy for the discovery and development of novel oncology compounds targeting Casein Kinase 1 alpha (CK1α), a component of the Wnt signaling pathway implicated in key oncogenic processes. Under the terms of the agreement, we will partner with StemSynergy to conduct preclinical and clinical studies with compounds targeting CK1α.
During the year ended December 31, 2018, we paid StemSynergy an upfront payment of $3.0$46.6 million, in initial research and development funding and provided $1.2 million in additional research and development funding. StemSynergy is eligible for up to $2.3 million in additional such funding on an as needed basis. The research and development funding costs incurred to date were included in Research and development expenses in the accompanying Consolidated Statements of Operations.
StemSynergy will also be eligible for up to $56.5 million in milestones for the first product to emerge from the collaboration, including preclinical and clinical development and regulatory milestone payments, sales-based milestones, as well as single-digit royalties on worldwide sales. We will be solely responsible for the commercialization of products that arise from the collaboration.
Invenra, Inc. (Invenra) Collaboration
In May 2018, we entered into a collaboration and license agreement with Invenra, which is focused on developing next-generation biologics, to discover and develop multispecific antibodies for the treatment of cancer. Invenra is responsible for antibody lead discovery and generation while we will lead Investigational New Drug enabling studies, manufacturing, clinical development in single-agent and combination therapy regimens, and future regulatory and commercialization activities. The collaboration agreement also provides that we will receive an exclusive, worldwide license to one preclinical asset, and that we will pursue up to six additional discovery projects during the term of the collaboration, which in total are directed to three discovery programs.
In consideration for the exclusive worldwide license and other rights contained in the collaboration agreement, we paid Invenra an upfront payment of $2.0$32.7 million and a project initiation fee of $2.0$31.3 million during the year ended December 31, 2018. The payments were included in Research and development expenses in the accompanying Consolidated Statements of Operations. As of December 31, 2018, we also have the right to initiate five additional discovery projects for development subject to an upfront payment of $2.0 million for each project as well as additional global milestone payments and royalties for any products that arise from these discovery efforts. Invenra is eligible to receive payments based on the achievement of specific development and regulatory milestones of up to $131.5 million for a product containing the lead preclinical asset in the first indication and up to $127.5 million for a product developed from each addition project we initiate. Upon successful commercialization of a product, Invenra is eligible to receive global milestone payments up to $325.0 million per product if certain sales thresholds are achieved as well as single digit tiered royalties on net sales of the approved product.
Unless earlier terminated, the collaboration agreement has a term that continues, on a product-by-product and country-by-country basis, until the later of (i) ten years after the first commercial sale of such product in such country or (ii) expiration of patent claims covering the product in such country. We may terminate the collaboration agreement in its entirety or on a project-by-project, basis at any time prior to commercialization, for any or no reason, upon thirty days’ written notice to Invenra. The collaboration agreement also may be terminated by either party for a material breach by the other, subject to notice and cure provisions.
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Other Collaborations
Genentech
Profits and losses on U.S. commercialization and Royalty revenues on ex-U.S. sales under the collaboration agreement with Genentech were as follows (in thousands):
 Year Ended December 31,
 2018 2017 2016
Profits and losses on U.S. commercialization$8,084
 $(2,140) $8,771
Royalty revenues on ex-U.S. sales$5,564
 $6,398
 $2,827
Profits on the U.S. commercialization of COTELLIC for the year ended December 31, 2018 were included Collaboration revenues and profits and losses on for the years ended December 31, 20172021, 2020 and 2016 were included in Selling, general and administrative expenses. The royalty revenues on ex-U.S. sales were included in2019, respectively.
Other Collaborations
Genentech Collaboration revenues for all periods presented. See “—Performance Obligations and Transaction Prices for our Other Collaborations”, below, for additional information related
We have out-licensed to revenue recognition for this collaboration.
In December 2006, we out-licensedGenentech under a worldwide collaboration agreement, the development and commercialization of cobimetinib, to Genentech pursuant to a worldwide collaboration agreement. Cobimetinib is a reversible inhibitor of MEK, a kinase that is a component ofunder the RAS/RAF/MEK/ERK pathway. Under thebrand name COTELLIC. The terms of the collaboration agreement we developed cobimetinib through the determination of the maximum tolerated dose in a phase 1 clinical trial, and Genentech had the option to co-develop cobimetinib, an optionrequire that Genentech exercised, and in March 2009, we granted to Genentech an exclusive worldwide revenue-bearing license to cobimetinib, at which point Genentech became responsible for completing the phase 1 clinical trial and the subsequent clinical development.
In November 2015, the U.S. Food and Drug Administration (FDA) approved cobimetinib, under the brand name COTELLIC, in combination with Genentech’s Zelboraf (vemurafenib) as a treatment for patients with BRAF V600E or V600K mutation-positive advanced melanoma. COTELLIC in combination with Zelboraf has also been approved in Switzerland, the EU, Canada, Australia, Brazil and multiple additional countries for use in the same indication. Prior to the FDA’s approval of COTELLIC, in November 2013, we exercised an option under the collaboration agreement to co-promote COTELLIC in the U.S., which allows for us to provide up to 25% of the total sales force for approved cobimetinib indications in the U.S. Between November 2015 and December 2017, we fielded 25% of the sales force promoting COTELLIC in combination with Zelboraf as a treatment for patients with BRAF mutation-positive advanced melanoma in the U.S. However, following a review of the commercial landscape, commencing in January 2018, we and Genentech scaled back the personal promotion of COTELLIC in this indication in the U.S.
Cobimetinib Profit Sharing and Royalty Revenues
Under the terms of our collaboration agreement, as amended in July 2017, we share in the profits and losses received or incurred in connection with COTELLIC’sthe commercialization of COTELLIC in the U.S. This profit and loss share has multiple tiers: we receive 50% of profits and losses from the first $200.0 million of U.S. actual sales, decreasing to 30% of profits and losses from U.S. actual sales in excess of $400.0 million. These tiers will reset each calendar year. The revenue for each sale of COTELLIC applied to the profit and loss statement for the collaboration agreement (Genentech Collaboration P&L) is calculated using the average of the quarterly net selling prices of COTELLIC and any additional branded Genentech product(s) prescribed with COTELLIC in such sale. U.S. commercialization costs for COTELLIC are then applied to the Genentech Collaboration P&L, subject to reduction based on the number of Genentech products in any given combination including COTELLIC. In addition to our profit share in the U.S., under the terms of the collaboration agreement, we are entitled to low double-digit royalties on net sales of COTELLIC outside the U.S. We are not eligible for any additional milestone payments
During the years ended December 31, 2021, 2020, and 2019, we recognized $12.1 million, $11.3 million, and $10.3 million, in revenues from profits and losses on U.S commercialization and royalties on ex-U.S. sales under the collaboration agreement with Genentech.
Unless earlier terminated, the collaboration agreement has a term that continues until the expirationGenentech and are included within license revenues on our Consolidated Statements of the last payment obligation with respect to the licensed products under the collaboration. Genentech has the right to terminate the collaboration agreement without cause at any time. If Genentech terminates the collaboration agreement without cause, all licenses that were granted to Genentech under the agreement terminate and revert to us. Additionally, if Genentech terminates the collaboration agreement without cause, or we terminate the collaboration agreement for cause, we would receive, subject to certain conditions, licenses from Genentech to research, develop and commercialize reverted product
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candidates. The collaboration agreement may be terminated for cause by either party based on uncured material breach by the other party.
Cobimetinib Clinical Development Program
Cobimetinib is being evaluated by Genentech in a development program consisting of more than 50 clinical trials. These trials are being sponsored by Genentech or through Genentech’s investigator sponsored trial program.Income.
Daiichi Sankyo
Collaboration revenues under the collaboration agreement with Daiichi Sankyo were as follows (in thousands):
 Year Ended December 31,
 2018 2017 2016
Daiichi Sankyo collaboration revenues$20,000
 $
 $15,000
See “—Performance Obligations and Transaction Prices for our Other Collaborations”, below, for additional information related to revenue recognition for this collaboration.
In March 2006, we entered into a collaboration agreement with Daiichi Sankyo for the discovery, development and commercialization of novel therapies targeted against the MR, a nuclear hormone receptor implicated in a variety of cardiovascular and metabolic diseases. Under the terms of the agreement, weWe have granted to Daiichi Sankyo an exclusive, worldwide license to certain intellectual property primarily relating to compounds that modulate MR, including esaxerenone, an oral, non-steroidal, selective MR antagonist. Daiichi Sankyo is responsible for all further preclinical and clinical development, regulatory, manufacturing and commercialization activities for the compounds. In January 2019, subsequent to our year-end, Daiichi Sankyo received approval from the Japanese Ministry of Health, Labour and Welfare forapproved esaxerenone, under the brand name MINNEBRO, as a treatment for patients with hypertension.
We have achieved milestones of $20.0 million for the year ended December 31, 2019 for the first commercial sale of MINNEBRO and are eligible to receive additional development, regulatory and sales-based milestone payments of up to $110.0$90.0 million under this collaboration agreement, including a $20.0 million milestone payment upon the first arm’s-length sale of MINNEBRO in Japan.agreement. In addition, we are entitled to receive low double-digit royalties on sales of MINNEBRO.
License revenue under the collaboration agreement with Daiichi Sankyo may terminatewas $3.8 million, $1.3 million and $20.1 million for the agreement upon 90 days’ written notice, in which case Daiichi Sankyo’s payment obligations would cease, its license relatingyears ended December 31, 2021, 2020 and 2019, respectively.
Research Collaborations, In-Licensing Arrangements and Other Business Development Activities

We entered into collaborative arrangements with other pharmaceutical or biotechnology companies to compounds that modulate MR would terminate and revert to us and we would receive, subject to certain terms and conditions, licenses from Daiichi Sankyo to research, develop and commercialize compoundsdrug candidates or intellectual property. Our research collaborations and in-licensing arrangements are intended to enhance our early-stage pipeline and expand our ability to discover, develop and commercialize novel therapies with the goal of providing new treatment options for cancer patients and their physicians. Our research collaborations, in-licensing arrangements and other strategic transactions include upfront payments, development, regulatory, commercial milestone payments and royalty payments, contingent upon the occurrence of certain future events linked to the success of the asset in development. Certain of our research collaborations provide us exclusive options that were discoveredgive us the right to license programs developed under the collaboration. In addition, pursuantresearch collaborations for further discovery and development. When we decide to a license agreement we entered into with Ligand Pharmaceuticals, Inc. (Ligand),exercise the options, we are required to pay a royaltyan exercise fee and then assume the responsibilities for all subsequent clinical development, manufacturing and commercialization. In conjunction with each of 0.5%these collaborative in-licensing arrangements, we were subject to Ligand on net sales of MINNEBRO.
Merck
Collaboration revenues under the collaboration agreement with Merck were as follows (in thousands):
 Year Ended December 31,
 2018 2017 2016
Merck collaboration revenues$
 $
 $5,000
See “—Performance Obligations and Transaction Price for our Other Collaborations”, below, for additional information related to revenue recognition for this collaboration.
In December 2011, we entered into an agreement with Merck pursuant to which we granted Merck an exclusive worldwide license to our phosphoinositide-3 kinase-delta (PI3K-δ) program, including XL499 and other related compounds. Pursuant to the terms of the agreement, Merck has sole responsibility to research, develop, and commercialize compounds from our PI3K-δ program. Subsequent to December 31, 2018, we have been notified by Merck that they will be terminating their PI3K-δ program, including their development activities under this collaboration agreement. Upon the termination of the collaboration agreement by Merck, the license granted to Merck will terminate.
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BMS - ROR Collaboration
Collaboration revenues under the ROR collaboration agreement with BMS were as follows (in thousands):
 Year Ended December 31,
 2018 2017 2016
BMS collaboration revenues$
 $12,500
 $
See “—Performance Obligations and Transaction Prices for our Other Collaborations”, below, for additional information related to revenue recognition for this collaboration.
In October 2010, we entered into a worldwide collaboration with BMS pursuant to which each party granted to the other certain intellectual property licenses to enable the parties to discover, optimize and characterize ROR antagonists that may subsequently be developed and commercialized by BMS. Since July 2013, BMS has been solely responsible for any further research, development, manufacture and commercialization of products developed under the collaborationupfront payments and will bear all costs and expenses associated with those activities.
We are eligiblemake payments for additionalpotential future development and regulatory milestone payments of up to $240.0 million in the aggregate and sales-based milestones of up to $150.0$254.3 million, regulatory milestones of up to $426.5 million and commercial milestones of up to $1,911.5 million, each in the aggregate per product or target, as well as royalties on commercialfuture net sales, depending onproduct sales. In conjunction with an asset purchase agreement, we made payments of $10.0 million for the advancementinitial technology transfer, and subject to certain conditions, will make a $4.0 million payment upon the completion of the product candidatetechnology transfer of certain materials and eventual product.
BMS may, at any time, terminate the collaboration agreement upon certain prior notice to us on a product-by-product and country-by-country basis. In addition, either party may terminate the agreement for the other party’s uncured material breach. In the event of termination by BMS at will or by us for BMS’s uncured material breach, the license granted to BMS would terminate, the right to such product would revert to us and we would receive a royalty-bearing license for late-stage reverted compounds and a royalty-free license for early-stage reverted compounds from BMS to develop and commercialize such productdocuments specified in the related country. In the event of termination by BMSasset purchase agreement. We will also make payments for our uncured material breach, BMS would retain the right to such product, subject to continued payment of milestones and royalties.
Performance Obligations and Transaction Prices for our Other Collaborations     
We have evaluated our collaborations agreements with Genentech, Daiichi Sankyo, Merck and BMS and have determined that those collaboration agreements each have one performance obligation: the delivery of intellectual property licenses to the collaboration partner. We have further determined that the licenses we provided represent functional intellectual property that was transferred at a point in time, when the agreements were executed, prior to the adoption of Topic 606. Potential variable consideration for these collaborations related to regulatory andpotential future development milestones was constrained dueof up to the fact that it was not probable that a significant reversal$42.0 million and regulatory milestones of cumulative revenue would not occur, given the inherent uncertainty of success with these milestones and therefore, any additional consideration earned and received from these collaborations will be fully recognized when the milestone is no longer constrained. Any variable consideration relatedup to royalties and other sales-based milestones will be recognized when the related sales occur as these amounts have been determined to relate predominantly to the licenses transferred and therefore are recognized at the later of when the performance obligation is satisfied or the related sales occur.$22.5 million, per product.
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In December 2021, we amended our collaboration agreement with Iconic to acquire broad rights to use the anti-TF antibody used in XB002 for any application, including conjugated to other payloads, as well as rights within oncology to a number of other anti-TF antibodies developed by Iconic, including for use in ADCs and multispecific biotherapeutics. Under the amended agreement, we agreed to pay a final one-time payment to Iconic of $55.0 million and will not owe any further payments, but we will continue to be responsible for milestone payments and royalties owed to other companies pursuant to prior agreements between Iconic and those companies. Upon signing the amendment, we recognized $55.0 million in research and development expense, which amount was payable as of December 31, 2021 and presented in accrued collaboration liabilities in our Consolidated Balance Sheets.
During the years ended December 31, 2021, 2020, and 2019, we recognized $176.1 million,$96.4 million and$47.7 million, respectively, relating to upfront license payments, research and development funding, development milestones, option fees and other fees within research and development expenses on the Consolidated Statements of Income.
NOTE 4. CASH AND INVESTMENTS
Cash, Cash Equivalents and Restricted Cash Equivalents
A reconciliation of Cash,cash, cash equivalents, and restricted cash equivalents reported within ourin the accompanying Consolidated Balance Sheets to the amount reported within the accompanying Consolidated Statements of Cash Flows was as follows (in thousands):
 December 31, 2018 December 31, 2017 December 31, 2016
Cash and cash equivalents$314,775
 $183,164
 $151,686
Restricted cash included in short-term restricted cash and investments
 504
 
Restricted cash included in long-term restricted cash and investments1,100
 4,646
 4,150
Cash, cash equivalents, and restricted cash as reported within the accompanying Consolidated Statements of Cash Flows$315,875
 $188,314
 $155,836
December 31,
20212020
Cash and cash equivalents$647,169 $319,217 
Restricted cash equivalents included in other long-term assets16,722 1,555 
Cash, cash equivalents, and restricted cash equivalents as reported within the accompanying Consolidated Statements of Cash Flows$663,891 $320,772 
Restricted cash includes certificates of depositequivalents are used to collateralize letters of credit and in prior periods,consist of money-market funds and certificates of deposit with original maturities of 90 days or less. The restricted cash equivalents are classified as other long-term assets based upon the remaining term of the underlying restriction. As of December 31, 2021, restricted cash equivalents included $15.2 million of short-term investments, which is collateral under our January 2021 standby letter of credit to guarantee our obligation to fund a purchasing card program.portion of the total tenant improvements related to our build-to-suit lease at our corporate campus. As we fund these tenant improvements, our restricted cash becomes available for operations.
Cash, cash equivalents, restricted cash equivalents and Investmentsinvestment
Cash, cash equivalents, restricted cash equivalents and investments by security type were as followsconsisted of the following (in thousands):
December 31, 2021
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair Value
Debt securities available-for-sale:
Commercial paper$945,801 $42 $(2)$945,841 
Corporate bonds541,774 876 (1,672)540,978 
U.S. Treasury and government-sponsored enterprises33,965 (21)33,945 
Municipal bonds12,924 15 (35)12,904 
Total debt securities available-for-sale1,534,464 934 (1,730)1,533,668 
Cash135,653 — — 135,653 
Money market funds66,531 — — 66,531 
Certificates of deposit119,056 — — 119,056 
Total cash, cash equivalents, restricted cash equivalents and investments$1,855,704 $934 $(1,730)$1,854,908 
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 December 31, 2018
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 Fair Value
Investments available-for-sale:       
Money market funds$47,744
 $
 $
 $47,744
Commercial paper381,134
 
 (1) 381,133
Corporate bonds344,741
 180
 (857) 344,064
U.S. Treasury and government sponsored enterprises55,224
 2
 (25) 55,201
Total investments available-for-sale828,843
 182
 (883) 828,142
Cash and restricted cash6,883
 
 
 6,883
Certificates of deposit16,596
 
 
 16,596
Total cash and investments$852,322
 $182
 $(883) $851,621
December 31, 2020
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair Value
Debt securities available-for-sale:
Commercial paper$569,456 $372 $— $569,828 
Corporate bonds543,520 5,244 (7)548,757 
U.S. Treasury and government-sponsored enterprises208,326 232 (4)208,554 
Municipal Bonds28,680 83 (1)28,762 
Total debt securities available-for-sale1,349,982 5,931 (12)1,355,901 
Cash82,176 — — 82,176 
Money market funds40,761 — — 40,761 
Certificates of deposit60,004 — — 60,004 
Total cash, cash equivalents, restricted cash equivalents and investments$1,532,923 $5,931 $(12)$1,538,842 
Interest receivable was $2.9 million and $4.5 million as of December 31, 2021 and 2020, respectively, and is included in prepaid and other current assets in the accompanying Consolidated Balance Sheets.
 December 31, 2017
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 Fair Value
Investments available-for-sale:       
Money market funds$45,478
 $
 $
 $45,478
Commercial paper199,647
 
 
 199,647
Corporate bonds179,336
 18
 (332) 179,022
U.S. Treasury and government sponsored enterprises16,295
 
 (32) 16,263
Total investments available-for-sale440,756
 18
 (364) 440,410
Cash and restricted cash3,268
 
 
 3,268
Certificates of deposit13,498
 
 
 13,498
Total cash and investments$457,522
 $18
 $(364) $457,176
GainsRealized gains and losses on the sales of investments available-for-sale were nominal or zeroinsignificant during the years ended December 31, 2018, 20172021, 2020 and 2016.2019.
TableWe manage credit risk associated with our investment portfolio through our investment policy, which limits purchases to high-quality issuers and limits the amount of Contents

our portfolio that can be invested in a single issuer. The fair value ofand gross unrealized losses on investmentsdebt securities available-for-sale in an unrealized loss position were as follows (in thousands):
December 31, 2021
Fair ValueGross Unrealized Losses
Corporate bonds$385,053 $(1,672)
Commercial paper43,290 (2)
U.S. Treasury and government-sponsored enterprises18,962 (21)
Municipal bonds7,475 (35)
Total$454,780 $(1,730)
December 31, 2018December 31, 2020
In an Unrealized Loss Position Less than 12 Months In an Unrealized Loss Position 12 Months or Greater Total
Fair Value Gross
Unrealized
Losses
 Fair Value Gross
Unrealized
Losses
 Fair Value Gross
Unrealized
Losses
Fair ValueGross Unrealized Losses
Corporate bonds$236,162
 $(606) $39,627
 $(251) $275,789
 $(857)Corporate bonds$28,445 $(7)
U.S. Treasury and government sponsored enterprises28,105
 (16) 9,182
 (9) 37,287
 (25)
Commercial paper7,091
 (1) 
 
 7,091
 (1)
U.S. Treasury and government-sponsored enterprisesU.S. Treasury and government-sponsored enterprises21,989 (4)
Municipal bondsMunicipal bonds5,865 (1)
Total$271,358
 $(623) $48,809
 $(260) $320,167
 $(883)Total$56,299 $(12)
 December 31, 2017
 In an Unrealized Loss Position Less than 12 Months In an Unrealized Loss Position 12 Months or Greater Total
 Fair Value Gross
Unrealized
Losses
 Fair Value Gross
Unrealized
Losses
 Fair Value Gross
Unrealized
Losses
Corporate bonds$140,746
 $(296) $20,047
 $(36) $160,793
 $(332)
U.S. Treasury and government sponsored enterprises13,611
 (23) 2,651
 (9) 16,262
 (32)
Total$154,357
 $(319) $22,698
 $(45) $177,055
 $(364)
All securities presented have been in an unrealized loss position for less than 12 months. There were 199133 and 134 investments14 debt securities in an unrealized loss position as of December 31, 20182021 and 2017,2020, respectively. During the years ended December 31, 2018, 20172021 and 20162020, we did not record any other-than-temporaryan allowance for credit losses or other impairment charges on our available-for-saleinvestment securities. Based upon our quarterly impairment review, we determined that the unrealized losses were not attributed to credit risk, but were primarily associated with changes in interest rates.rates and market liquidity. Based on the scheduled maturities of our investments, and our determinationwe determined that it was more likely than not that we will hold these investments for a period of time sufficient for a recovery of our cost basis, we concluded that the unrealized losses in our investment securities were not other-than-temporary.basis.
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The fair value of investmentsdebt securities available-for-sale by contractual maturity was as follows (in thousands):
 December 31,
 20212020
Maturing in one year or less$1,168,256 $1,034,150 
Maturing after one year through five years365,412 321,751 
Total debt securities available-for-sale$1,533,668 $1,355,901 
NOTE 5. FAIR VALUE MEASUREMENTS
Fair value reflects the amounts that would be received upon sale of an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The fair value hierarchy has the following three levels:
Level 1 - quoted prices (unadjusted) in active markets for identical assets and liabilities;
Level 2 - inputs other than level 1 that are observable either directly or indirectly, such as quoted prices in active markets for similar instruments or on industry models using data inputs, such as interest rates and prices that can be directly observed or corroborated in active markets; and
Level 3 - unobservable inputs that are supported by little or no market activity that are significant to the fair value measurement.
The classifications within the fair value hierarchy of our financial assets that were measured and recorded at fair value on a recurring basis were as follows (in thousands):
December 31, 2021
Level 1Level 2Total
Commercial paper$— $945,841 $945,841 
Corporate bonds— 540,978 540,978 
U.S. Treasury and government-sponsored enterprises— 33,945 33,945 
Municipal bonds— 12,904 12,904 
Total debt securities available-for-sale— 1,533,668 1,533,668 
Money market funds66,531 — 66,531 
Certificates of deposit— 119,056 119,056 
Total financial assets carried at fair value$66,531 $1,652,724 $1,719,255 
 December 31,
 2018 2017
Maturing in one year or less$674,455
 $377,155
Maturing after one year through five years153,687
 63,255
Total investments available-for-sale$828,142
 $440,410
December 31, 2020
Level 1Level 2Total
Commercial paper$— $569,828 $569,828 
Corporate bonds— 548,757 548,757 
U.S. Treasury and government-sponsored enterprises— 208,554 208,554 
Municipal bonds— 28,762 28,762 
Total debt securities available-for-sale— 1,355,901 1,355,901 
Money market funds40,761 — 40,761 
Certificates of deposit— 60,004 60,004 
Total financial assets carried at fair value$40,761 $1,415,905 $1,456,666 
Other Cost Method Equity Investments
During the years ended December 31, 2018, 2017When available, we value investments based on quoted prices for those financial instruments, which is a Level 1 input. Our remaining investments are valued using third-party pricing sources, which use observable market prices, interest rates and 2016, we recognized gains of $0.2 million, $3.0 million and $2.5 million, respectively, related to the August 2016 sale of our 9% interest in Akarna Therapeutics, Ltd. (Akarna) to Allergan Holdco UK Limited (Allergan). We acquired our interest in Akarna in 2015 in exchangeyield curves observable at commonly quoted intervals for intellectual property rights related to the Exelixis discovered compound XL335. The gain on sale was included in Other, net in the accompanying Consolidated Statements of Operations. We are eligible to earn additional such gains in the futuresimilar assets as Allergan continues its development of XL335.
Related Party Transactions
 During 2018, BlackRock, Inc. (BlackRock),observable inputs for pricing, which is a global provider of investment, advisory and risk management solutions, reported that their beneficial ownership increased to more than 10% of our outstanding common stock. BlackRock manages a portion of our cash and investments portfolio. As of December 31, 2018 and 2017, respectively, the fair value of cash andLevel 2 input.
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The carrying amount of our remaining financial assets and liabilities, which include cash, receivables and payables, approximate their fair values due to their short-term nature.
investments managed by BlackRock was $298.5 million and $141.0 million, which included $3.0 million and $1.0 million invested in the BlackRock Liquidity Money Market Fund. We incurred $0.2 million in fees for BlackRock advisory services performed during the year ended December 31, 2018.
NOTE 5.6. INVENTORY
Inventory consisted of the following (in thousands):
 December 31,
 20212020
Raw materials$8,867 $7,773 
Work in process27,717 20,610 
Finished goods12,927 7,291 
Total$49,511 $35,674 
Balance Sheet classification:
Current portion included in inventory$27,493 $20,973 
Long-term portion included in other long-term assets22,018 14,701 
Total$49,511 $35,674 
 December 31,
 2018 2017
Raw materials$1,922
 $498
Work in process6,170
 3,997
Finished goods3,836
 2,854
Total$11,928
 $7,349
    
Balance Sheet classification:   
Inventory$9,838
 $6,657
Inventory included in Other long-term assets2,090
 692
Total$11,928
 $7,349
Write-downs related to excess and expiring inventory are charged to either Cost of goods sold or the cost of supplied product included in Collaboration revenues. Such write-downs were $1.1 million, $1.2 million and $0.5 million for the years ended December 31, 2018, 2017 and 2016, respectively.
Inventory expected to be used in production or sold in periods more than 12 months from the date presented is classified as Other long-term assets in the accompanying Consolidated Balance Sheets. As of both December 31, 2018 and 2017, the non-current portion of inventory consisted of a portion of our finished goods.
NOTE 6. PROPERTY AND EQUIPMENT
Property and equipment were as follows (in thousands): 
 December 31,
2018
 December 31,
2017
Leasehold improvements$33,941
 $4,715
Computer equipment and software15,022
 14,146
Furniture and fixtures12,709
 1,609
Laboratory equipment5,668
 5,959
Construction in progress866
 22,114
 68,206
 48,543
Less: accumulated depreciation and amortization(17,309) (22,800)
Property and equipment, net$50,897
 $25,743
Depreciation expense was $4.9 million, $1.2 million and $1.0 million during the years ended December 31, 2018, 2017 and 2016, respectively.
In May 2017, we entered into the Lease for office and research facilities located at 1851, 1801, and 1751 Harbor Bay Parkway, Alameda, California (the Premises). The Lease was amended in October 2017 and June 2018 to increase the space leased to an aggregate of 134,765 square feet. For a description of the Lease, see “Note 11. Commitments.” In June 2018, we relocated our offices and research facilities to the Premises. Accordingly, we placed into service $46.3 million in related Leasehold improvements, Furniture and fixtures and Computer equipment and software, portions of which were included in Construction in progress at prior period ends.
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NOTE 7. STOCK-BASED COMPENSATION
We allocated the stock-based compensation expense for our equity incentive plans and our 2000 Employee Stock Purchase Plan (ESPP) as follows (in thousands):
 Year Ended December 31,
 2018 2017 2016
Research and development$13,115
 $7,569
 $9,366
Selling, general and administrative27,511
 16,369
 13,546
Total stock-based compensation$40,626
 $23,938
 $22,912
We have several equity incentive plans under which we granted stock options and RSUs to employees and directors. At December 31, 2018, 14,693,867 shares were available for grant under our equity incentive plans. The Board of Directors or a designated Committee of the Board is responsible for administration of our equity incentive plans and determines the term, exercise price and vesting terms of each grant. Stock options have a four-year vesting term, an exercise price equal to the fair market value on the date of grant, and a seven year life from the date of grant. Stock options issued prior to May 2011 have a ten year life from the date of grant. RSUs granted to our employees generally vest annually over a four year term.
We have adopted a Change in Control and Severance Benefit Plan for executives and certain non-executives. Eligible Change in Control and Severance Benefit Plan participants include employees with the title of vice president and above. If a participant’s employment is terminated without cause during a period commencing one month before and ending thirteen months following a change in control, as defined in the plan document, then the Change in Control and Severance Benefit Plan participant is entitled to have the vesting of all its outstanding stock options accelerated with the exercise period being extended to no more than one year.
We have an ESPP that allows for qualified employees (as defined in the ESPP) to purchase shares of our common stock at a price equal to the lower of85%of the closing price at the beginning of the offering period or85%of the closing price at the end of eachsixmonth purchase period. Compensation expense related to our ESPP was$2.2 million,$1.6 million, and$1.0 millionfor the years endedDecember 31, 2018,2017and2016, respectively. As ofDecember 31, 2018, we had4,722,008shares available for issuance under our ESPP. Pursuant to the ESPP, we issued330,492shares,434,523shares, and559,936shares of common stock at an average price per share of$15.74,$11.20and$3.91during the years endedDecember 31, 2018,2017and2016, respectively. Cash received from purchases under the ESPP in the years ended December 31, 2018, 2017 and 2016 was $5.2 million, $4.9 million and $2.2 million, respectively.
We used a Monte Carlo simulation pricing model to value stock options that include market vesting conditions and a Black-Scholes Merton option pricing model to value other stock options and ESPP purchases. The weighted average grant-date fair value per share of stock options and ESPP purchases was as follows:
 Year Ended December 31,
 2018 2017 2016
Stock options$9.07
 $11.42
 $4.77
ESPP$6.40
 $6.00
 $2.17
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The grant-date fair value of stock option grants and ESPP purchases was estimated using the following assumptions:
 Year Ended December 31,
 2018 2017 2016
Stock options:     
Risk-free interest rate2.81% 1.98% 1.15%
Dividend yield% % %
Volatility55% 59% 76%
Expected life4.4 years
 4.5 years
 4.4 years
ESPP:     
Risk-free interest rate1.93% 1.09% 0.55%
Dividend yield% % %
Volatility53% 58% 65%
Expected life6 months
 6 months
 6 months
We considered our implied volatility and our historical volatility in developing our estimates of expected volatility. The assumptions for the expected life of stock options were based on historical exercise patterns and post-vesting termination behavior. The risk-free interest rate is based on U.S. Treasury rates with the same or similar term as the underlying award. Our dividend rate is based on historical experience and our investors’ current expectations.
The fair value of RSUs was based on the closing price of the underlying common stock on the date of grant.
Activity for stock options during the year endedDecember 31, 2018 was as follows (dollars in thousands, except per share amounts):
 Shares 
Weighted 
Average
Exercise Price
 
Weighted 
Average
Remaining
Contractual
Term
 
Aggregate
Intrinsic
Value
Stock options outstanding at December 31, 201722,208,446
 $6.83
    
Granted3,238,473
 $19.40
    
Exercised(2,466,579) $4.90
    
Forfeited(288,197) $15.71
    
Expired(18,081) $20.64
    
Stock options outstanding at December 31, 201822,674,062
 $8.71
 3.7 years $254,201
Exercisable at December 31, 201816,463,202
 $5.65
 3.0 years $229,699
During the year endedDecember 31, 2018, in connection with our long-term incentive compensation program, we granted 308,365 stock options to our President and Chief Executive Officer that have a market vesting condition (PSOs). In addition to the standard service conditions included in our other stock options, these PSOs may not be exercised until, at any time after the grant date, the closing market price of a share of our Common Stock is equal to or greater than 125% of the per share exercise price of the PSO over a period of at least 30 consecutive calendar days. The stock-based compensation expense for the PSO is being recognized over the service period of the award, which commenced on the date of grant.
During the year ended December 31, 2016, the Compensation Committee of the Board of Directors of Exelixis convened to determine we had met certain performance objectives for performance-based stock options granted to employees in 2013, 2014 and 2015. As a result of these determinations, 5,870,303 performance-based stock options vested during 2016 and we recognized$4.1 millionin stock-based compensation for thoseperformance-based stock option grants. We didnot have any performance-based stock options outstanding during the year endedDecember 31, 2017 and therefore, did not record any stock-based compensation for performance-based stock options during that year.
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As of December 31, 2018, there was $48.0 million of unrecognized compensation expense related to our unvested stock options, including the PSOs described above. The compensation expense for the unvested stock options will be recognized over a weighted-average period of 2.5 years.
The aggregate intrinsic value in the table above represents the total intrinsic value (the difference between our closing stock price on the last trading day of fiscal 2018 and the exercise prices, multiplied by the number of in-the-money options) that would have been received by the stock option holders had all stock option holders exercised their stock options on December 31, 2018. The total intrinsic value of stock options exercised on the dates of exercise was $39.1 million, $85.2 million and $50.0 million during the years ended December 31, 2018, 2017 and 2016, respectively. Cash received from option exercises during the years ended December 31, 2018, 2017 and 2016 was $12.1 million, $17.6 million and $25.3 million, respectively. The total estimated fair value of stock options vested and recorded as expense during the years ended December 31, 2018, 2017 and 2016 was $18.9 million, $13.1 million and $13.4 million, respectively.
Activity for RSUs during the year endedDecember 31, 2018 was as follows (dollars in thousands, except per share amounts):
 Shares 
Weighted 
Average
Grant Date
Fair Value
 
Weighted 
Average
Remaining
Contractual 
Term
 
Aggregate
Intrinsic
Value
RSUs outstanding at December 31, 20173,762,990
 $17.76
    
Awarded2,519,425
 $18.46
    
Vested and released(1,081,339) $16.05
    
Forfeited(343,742) $18.99
    
RSUs outstanding at December 31, 20184,857,334
 $18.42
 2.1 years $94,427
During the year endedDecember 31, 2018, in connection with our long-term incentive compensation program, we awarded 693,131 RSUs that will vest upon the achievement of certain product revenue, late-stage clinical development and pipeline expansion performance targets (PSUs). These PSUs are included in the RSU activity table presented above. The PSUs were designed to drive the performance of our management team toward the achievement of key corporate objectives and will be forfeited if the performance targets are not met by December 31, 2021. Expense recognition for PSUs commences when the attainment of the performance goal is determined by management to be probable. During the year ended December 31, 2018, we did not recognize any compensation expense related to these PSUs. As of December 31, 2018, the total unrecognized compensation expense related to the unvested PSUs was $12.7 million. There were no performance-based RSUs issued prior to 2018.
As of December 31, 2018, there was $81.8 million of unrecognized compensation expense related to our unvested RSUs, including the PSUs described above. The compensation expense for the unvested RSUs will be recognized over a weighted-average period of 3.1 years.
401(k) Retirement Plan
We sponsor the Exelixis, Inc. 401(k) Plan (the 401(k) Plan) whereby eligible employees may elect to contribute up to the lesser of 50% of their annual compensation or the statutorily prescribed annual limit allowable under Internal Revenue Service regulations. During 2018, we made matching contributions in the form of our common stock of 100% of the first $8,500 of each participant’s contributions into the 401(k) Plan. We recorded compensation expense related to the stock match of $3.6 million, $1.7 million, and $1.1 million for the years ended December 31, 2018, 2017 and 2016, respectively. As ofDecember 31, 2018,571,674shares were available for issuance under the401(k) Plan.
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NOTE 8. INCOME TAXES
Our income (loss) before income taxes is derived solely from within the U.S. The Income tax benefit (provision) was as follows (in thousands):
 Year Ended December 31,
 2018 2017 2016
Current:     
Federal$
 $
 $
State(6,133) (4,350) 
Total current tax expense(6,133) (4,350) 
Deferred:     
Federal238,675
 
 
State5,436
 
 
Total deferred tax expense244,111
 
 
Income tax benefit (provision)$237,978
 $(4,350) $
The income tax benefit for the year ended December 31, 2018 primarily relates to the release of our valuation allowance against significantly all of our deferred tax assets offset by state taxes in jurisdictions outside of California, for which we do not have net operating loss carryforwards due to a limited operating history. Our historical net operating losses are sufficient to fully offset any federal taxable income. The Income tax provision for the year ended December 31, 2017, related to state taxes in jurisdictions outside of California, for which we do not have net operating loss carryforwards due to a limited operating history.
The reconciliation of the U.S. federal income tax (provision) benefit at the statutory federal income tax rates of 21%, 34% and 34% for the years ended December 31, 2018, 2017 and 2016, respectively, to our Income tax benefit (provision) was as follows (in thousands):
 Year Ended December 31,
 2018 2017 2016
U.S. federal income tax (provision) benefit at statutory rate$(94,939) $(53,916) $23,876
State tax expense(4,690) (8,282) (6,520)
Change in valuation allowance315,394
 34,266
 (6,377)
Research credits18,308
 
 
Stock-based compensation5,998
 20,548
 (3,155)
Non-deductible interest
 (1,367) (2,680)
Debt extinguishment
 
 (4,726)
Other(2,093) 4,401
 (418)
Income tax benefit (provision)$237,978
 $(4,350) $
Deferred tax assets and liabilities reflect the net tax effects of net operating loss and tax credit carryforwards and temporary differences between the carrying amounts of assets and liabilities for financial reporting and the amounts used for income tax purposes.
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Our deferred tax assets and liabilities were as follows (in thousands):
 December 31,
 2018 2017
Deferred tax assets:   
Net operating loss carryforwards$146,701
 $244,205
Tax credit carryforwards98,467
 66,770
Book over tax depreciation and amortization29,929
 39,472
Amortization of deferred stock compensation – non-qualified11,366
 8,966
Accruals and reserves not currently deductible10,425
 4,914
Deferred revenue5,474
 53,543
Other assets1,140
 1,088
Total deferred tax assets303,502
 418,958
Valuation allowance(58,112) (418,958)
Net deferred tax assets245,390
 
Deferred tax liabilities:   
Operating lease right-of-use assets(1,279) 
Total deferred tax liabilities(1,279) 
Net deferred taxes$244,111
 $
We applied the guidance in the Securities and Exchange Commission’s Staff Accounting Bulletin No. 118, Income Tax Accounting Implications of the Tax Cuts and Jobs Act, when accounting for the enactment-date effects of the Tax Cuts and Jobs Act in 2017 and throughout 2018. At December 31, 2017, we had not completed our accounting for all the enactment-date income tax effects of the Tax Cuts and Jobs Act for Section 162(m) related to the deduction limitation for the remuneration of certain employees. As of December 31, 2018, we have now completed our accounting for all of the enactment-date income tax effects of the Tax Cuts and Jobs Act and the impact was not material.
ASC Topic 740: Income Taxes (Topic 740) requires that the tax benefit of net operating losses, temporary differences and credit carry forwards be recorded as an asset to the extent that management assesses that realization is “more likely than not.” Realization of the future tax benefits is dependent on our ability to generate sufficient taxable income within the carry forward period. As of each reporting date, management considers new evidence, both positive and negative, that could affect its view of the future realization of deferred tax assets. As of December 31, 2018, based on the evaluation and weighting of both positive and negative evidence, including our achievement of a cumulative three-year income position as of December 31, 2018 and forecasts of future operating results, as well as considering the utilization of net operating losses and tax credits prior to their expiration, management determined that there is sufficient positive evidence to conclude that it is more likely than not the deferred tax assets of $244.1 million are realizable and the valuation allowance was reduced accordingly. As of December 31, 2018, we continue to carry a valuation allowance of $58.1 million against our California state deferred tax assets. Prior to December 31, 2018, because of our history of operating losses, management believed that recognition of the deferred tax assets was not more likely than not (as defined in Topic 740) to be realized and, accordingly, had provided a full valuation allowance. The valuation allowance decreased by $360.8 million and $210.1 million during 2018 and 2017, respectively.
At December 31, 2018, we had federal net operating loss carryforwards of approximately $614 million which expire in the years 2031 through 2036, and federal business tax credits of approximately $102 million which expire in the years 2021 through 2038. We also had state net operating loss carryforwards of approximately $453 million, which expire in the years 2028 through 2036, and California research and development tax credits of approximately $34 million, which do not expire.
Under the Internal Revenue Code and similar state provisions, certain substantial changes in our ownership could result in an annual limitation on the amount of net operating loss and credit carryforwards that can be utilized in future years to offset future taxable income. The annual limitation may result in the expiration of net operating losses and credit carryforwards before utilization. We completed a Section 382 study through December 31, 2018, and concluded that an ownership change, as defined under Section 382, had not occurred.
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The following table summarizes the activity related to our unrecognized tax benefits (in thousands):
 Year Ended December 31,
 2018 2017 2016
Beginning balance$79,342
 $61,809
 $88,638
Change relating to prior year provision(4,254) 247
 (29,110)
Change relating to current year provision1,083
 17,378
 2,304
Reductions based on the lapse of the applicable statutes of limitations(111) (92) (23)
Ending balance$76,060
 $79,342
 $61,809
We do not anticipate that the amount of unrecognized tax benefits existing as of December 31, 2018 will significantly change over the next 12 months. As of December 31, 2018, we had $76.1 million in unrecognized tax benefits, of which $46.0 million would reduce our income tax provision and the effective tax rate, if recognized. Interest and penalties were nominal or zero for all periods presented. We have elected to record interest and penalties in the accompanying Consolidated Statements of Operations as a component of income taxes.
We file U.S. and state income tax returns in jurisdictions with varying statues of limitations during which such tax returns may be audited and adjusted by the relevant tax authorities. The 1999 through 2018 tax years generally remain subject to examination by federal and most state tax authorities to the extent net operating losses and credits generated during these periods are being utilized in the open tax periods.
NOTE 9. NET INCOME (LOSS) PER SHARE
The computation of basic and diluted net income (loss) per share was as follows (in thousands, except per share amounts):
 Year Ended December 31,
 2018 2017 2016
Numerator:     
Net income (loss)$690,070
 $154,227
 $(70,222)
Net income allocated to participating securities
 (367) 
Net income (loss) allocable to common stock for basic net income (loss) per share690,070
 153,860
 (70,222)
Adjustment to net income allocated to participating securities
 22
 
Net income (loss) allocable to common stock for diluted net income (loss) per share$690,070
 $153,882
 $(70,222)
Denominator:     
Weighted-average shares of common stock outstanding used in computing basic net income (loss) per share297,892
 293,588
 250,531
Dilutive securities14,911
 18,415
 
Weighted-average shares of common stock outstanding and dilutive securities used in computing diluted net income (loss) per share312,803
 312,003
 250,531
      
Net income (loss) per share, basic$2.32
 $0.52
 $(0.28)
Net income (loss) per share, diluted$2.21
 $0.49
 $(0.28)
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Potential shares of common stock not included in the computation of diluted net income (loss) per share because to do so would be anti-dilutive was as follows (in thousands):
 Year Ended December 31,
 2018 2017 2016
Outstanding stock options, unvested RSUs and ESPP contributions3,968
 1,645
 27,568
Secured Convertible Notes due 2018 held by entities associated with Deerfield Management Company, L.P. (Deerfield Notes)
 
 33,890
2014 Warrants
 
 1,000
Total3,968
 1,645
 62,458
The Deerfield Notes were repaid in June 2017. Warrants to purchase an aggregate of 1,000,000 shares of our common stock issued in January 2014 (2014 Warrants) were participating securities. The warrant holders did not have a contractual obligation to share in our losses. The 2014 Warrants were fully exercised in September 2017.
NOTE 10. FAIR VALUE MEASUREMENTS7. PROPERTY AND EQUIPMENT
Property and equipment consisted of the following (in thousands):
Estimated Useful LivesDecember 31,
 20212020
Leasehold improvementsup to 15 years$73,589 $40,694 
Computer equipment and software3 years14,877 18,376 
Furniture and fixtures7 years15,780 14,931 
Laboratory equipment5 years23,744 11,707 
Construction in progress16,872 16,360 
    Total property and equipment144,862 102,068 
Less: accumulated depreciation(40,831)(34,684)
    Total property and equipment, net$104,031 $67,384 
Depreciation expense was $13.6 million, $9.1 million and $8.3 million during the years ended December 31, 2021, 2020 and 2019, respectively.
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NOTE 8. EMPLOYEE BENEFIT PLANS
Equity Incentive Plans and ESPP
We allocated the stock-based compensation expense for our equity incentive plans and our ESPP as follows (in thousands):
 Year Ended December 31,
 202120202019
Research and development$46,654 $37,198 $19,374 
Selling, general and administrative73,166 67,872 37,228 
Total stock-based compensation expense$119,820 $105,070 $56,602 
 Year Ended December 31,
 202120202019
Stock options$19,048 $19,863 $23,422 
Restricted stock units53,629 35,675 26,056 
Performance stock units43,428 47,106 4,878 
ESPP3,715 2,426 2,246 
Total stock-based compensation expense$119,820 $105,070 $56,602 
We have several equity incentive plans under which we granted stock options and RSUs, including PSUs, to employees and directors. At December 31, 2021, 11,004,584 shares were available for grant under the Exelixis, Inc. 2017 Equity Incentive Plan (as amended and restated, the 2017 Plan). The share reserve is reduced by 1 share for each share issued pursuant to a stock option award and 1.5 shares for full value awards granted in the form of RSUs or PSUs. On May 20, 2020, at our 2020 Annual Meeting of Stockholders, our stockholders approved the amendment and restatement of the 2017 Plan. The amendment and restatement increased the share reserve under the 2017 Plan by 21,000,000 shares, subject to adjustment for certain changes in our capitalization, which became effective immediately upon stockholder approval.
The classificationBoard of Directors delegated responsibility for administration of our financial assetsequity incentive plans to the Compensation Committee of our Board of Directors, including the authority to determine the term, exercise price and vesting requirements of each grant. Stock options granted to our employees and directors generally have a four-year vesting term and a one-year vesting term, respectively, an exercise price equal to the fair market value on the date of grant, and a seven-year life from the date of grant. RSUs granted to our employees and directors generally have a four-year vesting term and a one-year vesting term, respectively. PSUs granted pursuant to our equity incentive plans vest upon specified service conditions and the achievement of a performance target or market condition.
We have adopted a Change in Control and Severance Benefit Plan for certain executive officers. Eligible Change in Control and Severance Benefit Plan participants include employees with the title of vice president and above. If a participant’s employment is terminated without cause during a period commencing one month before and ending thirteen months following a change in control, as defined in the plan document, then the Change in Control and Severance Benefit Plan participant is entitled to have the vesting of all their outstanding equity awards accelerated and the exercise period for their stock options extended to no more than one year.
We have an ESPP that allows for qualified employees (as defined in the ESPP) to purchase shares of our common stock at a price equal to the lower of 85% of the closing price at the beginning of the offering period or 85% of the closing price at the end of each six-month purchase period. As of December 31, 2021, we had 3,168,354 shares available for issuance under our ESPP. Pursuant to the ESPP, we issued 536,226, 534,419 and 483,009 shares of common stock at an average price per share of $17.76, $14.55 and $12.60 during the years ended December 31, 2021, 2020 and 2019, respectively. Cash received from purchases under the ESPP for the years ended December 31, 2021, 2020 and 2019 was $9.5 million, $7.8 million and $6.1 million, respectively.
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We used a Black-Scholes Merton option pricing model to value stock options and ESPP purchases. The weighted average grant-date fair value per share of stock options and ESPP purchases were as follows:
 Year Ended December 31,
 202120202019
Stock options$9.04 $9.44 $8.19 
ESPP$6.12 $6.12 $4.85 

The grant-date fair value of stock option grants and ESPP purchases was estimated using the following assumptions:
 Year Ended December 31,
 202120202019
Stock options:
Risk-free interest rate0.74 %0.30 %1.77 %
Dividend yield— %— %— %
Volatility51 %54 %48 %
Expected life4.6 years4.4 years4.3 years
ESPP:
Risk-free interest rate0.08 %0.79 %2.16 %
Dividend yield— %— %— %
Volatility47 %52 %50 %
Expected life6 months6 months6 months
We considered both implied and historical volatility in developing our estimate of expected volatility. The assumption for the expected life of stock options is based on historical exercise patterns and post-vesting termination behavior. The risk-free interest rate is based on U.S. Treasury rates with the same or similar term as the underlying award. Our dividend rate is based on historical experience and our investors’ current expectations.
The fair value of RSUs, including PSUs, was based on the closing price of the underlying common stock on the date of grant.
Activity for stock options during the year ended December 31, 2021 was as follows (in thousands, except per share amounts):
Shares
Weighted 
Average
Exercise Price
Weighted 
Average
Remaining
Contractual
Term
Aggregate
Intrinsic
Value
Stock options outstanding at December 31, 202016,129 $12.72 
Granted2,573 $21.33 
Exercised(4,486)$4.23 
Cancelled(545)$21.15 
Stock options outstanding at December 31, 202113,671 $16.79 3.3 years$48,860 
Stock options exercisable at December 31, 20219,962 $15.23 2.4 years$48,171 
As of December 31, 2021, there was $27.8 million of unrecognized compensation expense related to our unvested stock options. The compensation expense for the unvested stock options will be recognized over a weighted-average period of 2.7 years.
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The aggregate intrinsic value in the table above represents the total intrinsic value (the difference between our closing stock price on the last trading day of fiscal 2021 and the exercise prices, multiplied by the number of in-the-money stock options) that would have been received by the stock option holders had all stock option holders exercised their stock options on December 31, 2021. The total intrinsic value of stock options exercised during the years ended December 31, 2021, 2020 and 2019 was $76.0 million, $106.5 million and $54.1 million, respectively. Cash received from stock option exercises during the years ended December 31, 2021, 2020 and 2019 was $14.8 million, $26.9 million and $16.4 million, respectively.

Activity for RSUs during the year ended December 31, 2021 was as follows (in thousands, except per share amounts):

Shares
Weighted 
Average
Grant Date
Fair Value
Weighted 
Average
Remaining
Contractual 
Term
Aggregate
Intrinsic
Value
RSUs outstanding at December 31, 20205,378 $21.96 
Awarded4,220 $21.34 
Vested and released(2,020)$22.03 
Forfeited(750)$21.69 
RSUs outstanding at December 31, 20216,828 $21.58 1.7 years$124,824 
As of December 31, 2021, there was $123.6 million of unrecognized compensation expense related to our unvested RSUs which will be recognized over a weighted-average period of 2.9 years.
Activity for PSUs, during the year ended December 31, 2021 was as follows (in thousands, except per share amounts):
Shares
Weighted 
Average
Grant Date
Fair Value
Weighted 
Average
Remaining
Contractual 
Term
Aggregate
Intrinsic
Value
PSUs outstanding at December 31, 20207,378 $21.70 
Awarded2,056 $24.54 
Vested and released(2,388)$19.76 
Forfeited(736)$22.57 
PSUs outstanding at December 31, 20216,310 $23.00 3.0 years$98,121 
In March 2021, in connection with our long-term incentive compensation program, we awarded certain employees 1,027,650 (the 2021 target amount) PSUs, subject to a performance and a market condition (the 2021 PSUs). Pursuant to the terms of 2021 PSUs, the holders of the awards may earn up to 200% of the 2021 target amount, or up to 2,055,300 total shares, depending on the level of achievement of the performance condition related to certain net product revenues and a total shareholder return (TSR) market condition. The TSR market condition is based on our relative TSR percentile rank compared to companies in the Nasdaq Biotechnology Index during the performance period, which is January 2, 2021 through December 29, 2023. NaN percent of the shares earned subject to the performance and market conditions will vest at the end of the performance period and the remainder will vest approximately one year later subject to an employee’s continuous service. The 2021 PSUs will be forfeited if the performance condition at or above a threshold level is not achieved by December 29, 2023. The performance condition for a threshold of net product revenues relative to the 2021 PSUs was deemed probable of achievement in the fourth quarter of 2021.
A Monte Carlo simulation model was used to determine the grant date fair value of $24.54 for the 2021 PSUs based on the following assumptions:
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Fair value of the Company’s common stock on grant date$21.31 
Expected volatility49 %
Risk-free interest rate0.29 %
Dividend yield— %
During the year ended December 31, 2020, in connection with our long-term incentive compensation program, we awarded 2,327,840 PSUs (the 2020 target amount) that will vest upon the achievement of performance targets related to clinical trial positive top-line results and product approvals by the FDA (the 2020 PSUs). Pursuant to the terms of the 2020 PSUs, employees may earn up to 200% of the 2020 target amount, or 4,655,680 total shares, depending on the volume and timing of achievement of the performance targets. The 2020 PSUs will be forfeited if the performance targets are not met by December 31, 2024. The performance condition for threshold achievement of a product approval by the FDA relative to the 2020 PSUs occurred in the third quarter of 2021 representing 25% of the 2020 target amount.
During the year ended December 31, 2019, in connection with our long-term incentive compensation program, we awarded 1,926,605 PSUs (the 2019 target amount) that vest upon the achievement of performance targets related to product approvals by the FDA (the 2019 PSUs). Pursuant to the terms of the 2019 PSUs, employees may earn up to 200% of the 2019 target amount, or 3,853,210 total shares, depending on the volume and timing of achievement of the performance targets. The performance condition for early achievement of the 2019 PSUs occurred during 2020 representing 150% of the 2019 target amount. The performance condition for earning the remaining 50% of the 2019 target amount occurred in early 2021.
During the year ended December 31, 2018, we awarded 693,131 PSUs that vest upon the achievement of certain product revenue, late-stage clinical development programs and discovery pipeline expansion performance targets (the 2018 PSUs). The performance targets for 167,726 remaining 2018 PSUs were achieved in 2021.
Expense recognition for PSUs commences when it is determined that attainment of the performance target is probable. Of the aggregate outstanding PSUs, 4,853,112 relate to awards for which we achieved the performance target. As of December 31, 2021, the remaining unrecognized compensation expense for the PSUs achieved or deemed probable of achievement related to the PSUs was $12.1 million, which will be recognized over a weighted-average period of 3.0 years. The total unrecognized compensation expense for the PSUs for which we have not yet determined that attainment of the performance target is probable was $121.6 million as of December 31, 2021.
Exelixis, Inc. 401(k) Plan (the 401(k) Plan)
We sponsor the 401(k) Plan under which we have historically made matching contributions to our employees’ 401(k) accounts in the form of our common stock. Beginning in 2020, our matching contributions are in the form of cash. We recorded compensation expense of $9.5 million, $6.7 million and $4.6 million for the years ended December 31, 2021, 2020 and 2019, respectively, for matching contributions to our employees 401(k) accounts.
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NOTE 9. PROVISION FOR INCOME TAXES
Our income before income taxes is derived solely from within the fair value hierarchy that were measured and recorded at fair value on a recurring basisU.S. Our provision for income taxes was as follows (in thousands):
 Year Ended December 31,
 202120202019
Current:
Federal$11,338 $— $— 
State5,224 3,791 6,095 
Total current tax expense$16,562 $3,791 $6,095 
Deferred:
Federal$46,416 $14,886 $71,580 
State113 379 (578)
Total deferred tax expense46,529 15,265 71,002 
Provision for income taxes$63,091 $19,056 $77,097 
 December 31, 2018
 Level 1 Level 2 Total
Money market funds$47,744
 $
 $47,744
Commercial paper
 381,133
 381,133
Corporate bonds
 344,064
 344,064
U.S. Treasury and government sponsored enterprises
 55,201
 55,201
Total investments available-for-sale47,744
 780,398
 828,142
Certificates of deposit
 16,596
 16,596
Total financial assets carried at fair value$47,744
 $796,994
 $844,738
 December 31, 2017
 Level 1 Level 2 Total
Money market funds$45,478
 $
 $45,478
Commercial paper
 199,647
 199,647
Corporate bonds
 179,022
 179,022
U.S. Treasury and government sponsored enterprises
 16,263
 16,263
Total investments available-for-sale45,478
 394,932
 440,410
Certificates of deposit
 13,498
 13,498
Total financial assets carried at fair value$45,478
 $408,430
 $453,908
We didThe provision for income taxes for the years ended December 31, 2021, 2020, and 2019 primarily relates to the utilization of federal tax attributes and state taxes in jurisdictions outside of California, for which we do not have net operating loss carryforwards due to a limited operating history. Our historical net operating losses were sufficient to fully offset any federal taxable income for the years ended December 31, 2020 and 2019 but were not sufficient to fully offset federal taxable income for the year ended December 31, 2021.
The reconciliation of the U.S. federal income tax provision at the statutory federal income tax rate of 21% for each of the years ended December 31, 2021, 2020 and 2019, respectively, to our provision for income taxes was as follows (in thousands):
 Year Ended December 31,
 202120202019
U.S. federal income tax provision at statutory rate$61,772 $27,476 $83,603 
State tax (benefit) expense1,336 (2,232)1,148 
Change in valuation allowance2,883 5,525 3,208 
Research credits(6,263)(11,356)(8,299)
Stock-based compensation(11,831)(20,399)(9,177)
Non-deductible executive compensation11,182 18,067 4,228 
Branded prescription drug fee2,897 2,537 1,099 
Other1,115 (562)1,287 
Provision for income taxes$63,091 $19,056 $77,097 
Deferred tax assets and liabilities reflect the net tax effects of net operating loss and tax credit carryforwards and temporary differences between the carrying amounts of assets and liabilities for financial reporting and the amounts used for income tax purposes.
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Our deferred tax assets and liabilities measuredwere as follows (in thousands):
 December 31,
 20212020
Deferred tax assets:
Net operating loss carryforwards$17,993 $37,454 
Tax credit carryforwards101,460 126,625 
Depreciation and amortization7,764 18,414 
Stock-based compensation23,162 19,818 
Lease liabilities12,385 11,908 
Accruals and reserves not currently deductible19,531 12,207 
Deferred revenue8,040 7,637 
Other assets1,303 — 
Total deferred tax assets191,638 234,063 
Valuation allowance(70,068)(67,185)
Net deferred tax assets121,570 166,878 
Deferred tax liabilities:
Lease right-of-use assets(9,907)(9,510)
Other liabilities— (657)
Total deferred tax liabilities(9,907)(10,167)
Net deferred taxes$111,663 $156,711 
ASC Topic 740: Income Taxes (Topic 740) requires that the tax benefit of net operating losses, temporary differences and credit carry forwards be recorded at fair valueas an asset to the extent that management assesses that realization is “more likely than not.” Realization of the future tax benefits is dependent on our ability to generate sufficient taxable income within the carry forward period. As of each reporting date, management considers new evidence, both positive and negative, that could affect its view of the future realization of deferred tax assets. As of December 31, 2021, based on the evaluation and weighting of both positive and negative evidence, including our achievement of a recurring basiscumulative three-year income position as of December 31, 2018 or 2021 and forecasts of future operating results, as well as considering the utilization of net operating losses and tax credits prior to their expiration, management determined that there is sufficient positive evidence to conclude that it is more likely than not the deferred tax assets are realizable. As of December 31, 2017. We did not have any financial assets or liabilities classified as Level 3 in the fair value hierarchy as2021 and 2020, we continue to carry a valuation allowance of December 31, 2018 or December 31, 2017. There were no transfers of financial assets or liabilities between Levels 1, 2$70.1 million and 3$67.2 million, respectively, against our California state deferred tax assets. The valuation allowance increased by $2.9 million and $5.5 million during the years ended December 31, 2018 or 2017.2021 and 2020, respectively.
When available,At December 31, 2021, we value investments basedhad federal business tax credits of approximately $101.0 million which expire in the years 2025 through 2041. We also had state net operating loss carryforwards of approximately $426.0 million, which expire in the years 2022 through 2036, California research and development tax credits of approximately $45.0 million, which do not expire, and California Competes Tax Credits of approximately $2.0 million, which expire in 2026.
Under the Internal Revenue Code and similar state provisions, certain substantial changes in our ownership could result in an annual limitation on quoted prices for those financial instruments, which is a Level 1 input. Our remaining investments are valued using third-party pricing sources, which use observable market prices, interest rates and yield curves observable at commonly quoted intervals for similar assets as observable inputs for pricing, which is a Level 2 input.
See “Note 11. Commitments” regarding the determination of the amount of net operating loss and credit carryforwards that can be utilized in future years to offset future taxable income. The annual limitation may result in the expiration of net operating losses and credit carryforwards before utilization. We completed a Section 382 analysis through December 31, 2021, and concluded that an ownership change, as defined under Section 382, had not occurred.
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The following table summarizes the activity related to our operating lease liabilitiesunrecognized tax benefits (in thousands):
 Year Ended December 31,
 202120202019
Beginning balance$80,941 $79,078 $76,060 
Change relating to prior year provision728 591 589 
Change relating to current year provision2,215 3,305 2,429 
Reductions based on the lapse of the applicable statutes of limitations(301)(2,033)— 
Ending balance$83,583 $80,941 $79,078 
We do not anticipate that the amount of unrecognized tax benefits existing as of December 31, 2018. Our remaining financial assets2021 will significantly change over the next 12 months. As of December 31, 2021, we had $83.6 million in unrecognized tax benefits, of which $52.6 million would reduce our provision for income taxes and liabilities include cashthe effective tax rate, if recognized. Interest and restricted cash, Trade receivables,penalties were nominal or zero for all periods presented. We have elected to record interest and penalties in the accompanying Consolidated Statements of Income as a component of income taxes.
We file U.S. and state income tax returns in jurisdictions with varying statues of limitations during which such tax returns may be audited and adjusted by the relevant tax authorities. The 2001 through 2021 tax years generally remain subject to examination by federal and most state tax authorities to the extent net Other receivables, Accounts payable, Accrued compensationoperating losses and benefits, Accrued clinical trial liabilities, Accruedcredits generated during these periods are being utilized in the open tax periods.
NOTE 10. NET INCOME PER SHARE
Net income per share - basic and diluted, were computed as follows (in thousands, except per share amounts):
 Year Ended December 31,
 202120202019
Numerator:
Net income$231,063 $111,781 $321,012 
Denominator:
Weighted-average common shares outstanding - basic314,884 308,271 302,584 
Dilutive securities7,475 9,730 12,425 
Weighted-average common shares outstanding - diluted322,359 318,001 315,009 
Net income per share - basic$0.73 $0.36 $1.06 
Net income per share - diluted$0.72 $0.35 $1.02 
Dilutive securities included outstanding stock options, unvested RSUs and PSUs and ESPP contributions. Certain potential common shares were excluded from our calculation of weighted-average common shares outstanding - diluted because either they would have had an anti-dilutive effect on net income per share or they were related to shares from PSUs that were contingently issuable and the contingency had not been satisfied at the end of the reporting period. See “Note 8. Employee Benefit Plans” for a further description of our equity awards. The weighted-average potential common shares excluded from our calculation were as follows (in thousands):
 Year Ended December 31,
 202120202019
Anti-dilutive securities and contingently issuable shares excluded14,305 10,959 9,111 

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collaboration liabilities, Rebates and fees due to customers and other current and long-term liabilities. Those financial assets and liabilities are carried at cost which approximates their fair values.
NOTE 11. COMMITMENTS AND CONTINGENCIES
Leases
As described further in “Note 1. Organization and Summary of Significant Accounting Policies”, we adopted Topic 842 as of January 1, 2018. Prior period amounts have not been adjusted and continue to be reported in accordance with our historic accounting under Topic 840.Headquarters Lease
In May 2017, we entered into thea Lease with AscentrisAgreement (the Lease) for office and research facilitiesour corporate headquarters located at the Premises in Alameda, California.California (the Initial Premises). The Lease was subsequently amended in October 2017, and June 2018, April 2019, August 2019, January 2020 and December 2020, resulting in, among other things, an increase to increase the amount of space leased and changes to an aggregatethe lease term. Our right-of-use asset, lease liability and the related lease costs reflect the 254,690 square feet of 134,765space we have taken possession of as of December 31, 2021 (the Current Premises) under the amended Lease, including 25,749 square feet.feet of space we took possession of in 2021.
The term of the Lease continues through October 31, 2031 (the Lease Term). We have made certain tenant improvements to the space leased on the Premises, for which we received $8.2 million in reimbursements in January 2019. The Lease’s initial term is through January 31, 2028. Rent payments began February 1, 2018, following the conclusion of a partial twelve-month rent abatement period. We have two2 five-year options to extend the Lease and a one-time option to terminate the Lease without cause on the last day of the 8th year of the initial term; none ofLease; these optional periods have not been considered in the determination of the right-of-use asset or the lease liability for the Lease as we did not consider it reasonably certain that we would exercise any such options. The Lease further provides that we are obligated to pay to Ascentris certain variable costs, including taxes and operating expenses. We also have a right of first offer to lease certain additional space, in the aggregate of approximately 170,000 square feet of space, as that additional space becomes available at 1601, 1701 and 1751 Harbor Bay Parkway, Alameda, California over the remainder of the initial term of the Lease at a market rate determined pursuant to the Lease.
We had an additional operating lease which expired in July 2018 for two buildings in South San Francisco, California with a total area of 116,063 square feet.
We have performedmade certain tenant improvements on the Initial Premises, for which we received $8.2 million in reimbursements in January 2019. During 2020, we also made certain tenant improvements for which we have received $1.7 million in reimbursements in 2021 related to the additional space we obtained under the April 2019 amendment. We were also provided an evaluationallowance of our other contracts with customers and suppliersup to $1.4 million in accordance with Topic 842 and have determined that, except2021 for certain planned tenant improvements to the leases described above, a nominal operating lease foradditional space at a data center to house our data servers and a nominal financing lease for office equipment, none of our contracts contain a lease.obtained under the December 2020 amendment.
The balance sheet classification of our operating lease assets and liabilities waswere as follows (in thousands):
 December 31,
2018
 December 31, 2017
Operating lease liabilities:   
Current portion included in Other current liabilities$2,738
 $540
Long-term portion of lease liabilities12,099
 408
Total operating lease liabilities14,837
 948
Financing lease liabilities:   
Financing obligation for build-to-suit lease
 14,530
Current portion included in Other current liabilities49
 
Long-term portion of lease liabilities79
 
Total financing lease liabilities128
 14,530
Total lease liabilities$14,965
 $15,478
December 31,
 20212020
Assets:
Right-of-use assets included in other long-term assets$45,122 $43,010 
Liabilities:
Current portion included in other current liabilities$5,137 $3,025 
Long-term portion of operating lease liabilities51,272 49,086 
Total operating lease liabilities$56,409 $52,111 
The components of operating lease costs, which wereare included in Operatingselling, general and administrative expenses in our Consolidated Statements of Operations,Income, were as follows (in thousands):
 Year Ended December 31,
 2018 2017 2016
Operating lease cost$4,189
 $3,944
 $8,620
Variable lease cost1,661
 2,216
 1,056
Sublease income
 (1,225) (3,553)
Total lease costs$5,850
 $4,935
 $6,123
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Year Ended December 31,
202120202019
Operating lease cost$5,332 $4,825 $2,844 
Variable lease cost2,685 2,830 1,024 
Total operating lease costs$8,017 $7,655 $3,868 
Cash paid for amounts included in the measurement of lease liabilities for the yearyears ended December 31, 20182021, 2020 and 2019 was $3.9$5.0 million, $4.6 million and $2.9 million, respectively, and was included in Netnet cash provided by operating activities in our Consolidated Statements of Cash Flows.
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As of December 31, 2018,2021, the maturities of our operating lease liabilities were as follows (in thousands):
Year Ended December 31,Amount
2022$5,638 
20235,995 
20246,283 
20256,478 
20266,675 
Thereafter35,170 
Total lease payments66,239 
Less:
Imputed interest(9,404)
Future tenant improvement reimbursements(426)
Operating lease liabilities$56,409 
 Operating leases
Years ending December 31, 
2019$2,794
20202,823
20212,904
20223,000
20233,082
Thereafter13,584
Total lease payments28,187
Less: 
Present value adjustment(5,180)
Tenant improvement reimbursements(8,170)
Operating lease liabilities$14,837
Operating lease liabilities are based on the net present value of the remaining lease payments over the remaining lease term. In determining the present value of lease payments, we use our incremental borrowing rate based on the information available at the lease commencement date. As of December 31, 2018, the weighted average remaining lease term is 9.0 years and2021, the weighted average discount rate used to determine the operating lease liability was 4.50%3.1% and the weighted average remaining lease term was 9.8 years.
Build-to-Suit Lease
In October 2019, we entered into a build-to-suit Lease Agreement (the Build-to-Suit Lease) for approximately 220,000 square feet of office space located in Alameda, California (the New Premises), adjacent to the Current Premises.
The term of the Build-to-Suit Lease is for a period of 242 months (the Term), which will begin upon the substantial completion of the building and tenant improvements by the lessor. We currently anticipate that the Term will begin in the first quarter of 2022 (which date will be the Lease Commencement Date). The monthly base rent under the Build-to-Suit Lease will equal a percentage of the total development costs incurred in connection with the development of the New Premises (excluding the cost of the tenant improvements in excess of the allowance provided by the lessor and any development costs we pay) and is currently estimated to be about $0.7 million, subject to an annual increase of 3% during the Term. We will also be responsible for paying operating expenses related to the New Premises. The rent payments will begin sixty days following commencement of the Term. We have been provided a tenant improvement allowance for the New Premises of approximately $16.5 million. To the extent that the total development costs of the New Premises exceeds $525 per square foot, we will also pay 50% of such excess costs prior to the commencement of the Term, and we are required to secure such amount by providing a letter of credit or depositing such amounts in an account with the lessor’s lender.
The Build-to-Suit Lease includes 2 five-year options to extend the term of the Build-to-Suit Lease, exercisable under certain conditions and at a market rate determined in accordance with the Build-to-Suit Lease. We have a one-time option to terminate the Build-to-Suit Lease without cause after the 180th month of the Term, exercisable under certain conditions as described in the Build-to-Suit Lease and subject to a termination payment calculated in accordance with the Build-to-Suit Lease. In addition, we have a right of first offer to purchase the New Premises, subject to certain procedures and exclusions set forth in the Build-to-Suit Lease.
We have determined that, under the guidance provided in Topic 842, we do not have control of the New Premises during the construction period. Therefore, we will not record a right-of-use asset or lease liability for the Build-to-Suit Lease until the Lease Commencement Date. We will evaluate the classification of the Build-to-Suit Lease as an operating lease or financing lease at the Lease Commencement Date. We determined the cost of tenant improvements during the construction period are lessor assets and considered a prepayment of lease under Topic 842. The costs incurred as of December 31, 2021 of $36.8 million are recorded as other long-term assets in the Consolidated Balance Sheets.
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Letters of Credit and Restricted Cash
We have obtained two standby letters of credit related to the Lease with Ascentris with a combined credit limit of $1.0 million as of both December 31, 2018 and 2017. We have also obtained standby letters of credit related to a workers compensation insurance policyour lease obligations and certain other obligations with combined credit limits of $0.1$16.7 million and $0.6$1.6 million as of December 31, 20182021 and 2017,2020, respectively. We had also previously obtained
In January 2021, we entered into a standby letter of credit as guarantee of our obligation to fund our portion of the tenant improvements related to our South San Franciscobuild-to-suit lease with aat our corporate campus. The letter of credit limitis secured by our short-term investments, which are recorded as restricted cash equivalents and presented in Other long-term assets in our Consolidated Balance Sheets and is reduced as we fund our portion of $0.5 million asthe tenant improvements. As of December 31, 20172021, restricted cash equivalents included $15.2 million of short-term investments as collateral under our standby letter of credit for our portion of the tenant improvements.
Legal Proceedings
In September 2019, we received a notice letter regarding an Abbreviated New Drug Application (ANDA) submitted to the FDA by MSN Pharmaceuticals, Inc. (MSN), requesting approval to market a generic version of CABOMETYX tablets. MSN’s initial notice letter included a Paragraph IV certification with respect to our U.S. Patent Nos. 8,877,776 (salt and polymorphic forms), 9,724,342 (formulations), 10,034,873 (methods of treatment) and 10,039,757 (methods of treatment), which was released during 2018. Asare listed in the Approved Drug Products with Therapeutic Equivalence Evaluations, also referred to as the Orange Book, for CABOMETYX. MSN’s initial notice letter did not provide a Paragraph IV certification against U.S. Patent No. 7,579,473 (composition of December 31, 2018matter) or U.S. Patent No. 8,497,284 (methods of treatment), noneeach of which is listed in the Orange Book. On October 29, 2019, we filed a complaint in the United States District Court for the District of Delaware (the Delaware District Court) for patent infringement against MSN asserting infringement of U.S. Patent No. 8,877,776 arising from MSN’s ANDA filing with the FDA. On November 20, 2019, MSN filed its response to the complaint, alleging that the asserted claims of U.S. Patent No. 8,877,776 are invalid and not infringed. On May 5, 2020, we received notice from MSN that it had amended its ANDA to include additional Paragraph IV certifications. In particular, the ANDA requested approval to market a generic version of CABOMETYX tablets prior to expiration of two previously unasserted CABOMETYX patents: U.S. Patent Nos. 7,579,473 and 8,497,284. On May 11, 2020, we filed a complaint in the Delaware District Court for patent infringement against MSN asserting infringement of U.S. Patent Nos. 7,579,473 and 8,497,284 arising from MSN’s amended ANDA filing with the FDA. Neither of our letterscomplaints have alleged infringement of creditU.S. Patent Nos. 9,724,342, 10,034,873 and 10,039,757. On May 22, 2020, MSN filed its response to the complaint, alleging that the asserted claims of U.S. Patent Nos. 7,579,473 and 8,497,284 are invalid and not infringed. On March 23, 2021, MSN filed its First Amended Answer and Counterclaims (amending its prior filing from May 22, 2020), seeking, among other things, a declaratory judgment that U.S. Patent No. 9,809,549 is invalid and would not be infringed by MSN if its generic version of CABOMETYX tablets were approved by the FDA. U.S. Patent No. 9,809,549 is not listed in the Orange Book. On April 7, 2021, we filed our response to MSN’s First Amended Answer and Counterclaims, denying, among other things, that U.S. Patent No. 9,809,549 is invalid or would not be infringed.
On October 1, 2021, pursuant to a stipulation between us and MSN, the Delaware District Court entered an order that (i) MSN’s submission of its ANDA constitutes infringement of certain claims relating to U.S. Patent Nos. 7,579,473 and 8,497,284, if those claims are not found to be invalid, and (ii) upon approval, MSN’s commercial manufacture, use, sale or offer for sale within the U.S., and importation into the U.S., of MSN’s ANDA product prior to the expiration of U.S. Patent Nos. 7,579,473 and 8,497,284 would also infringe certain claims of each patent, if those claims are not found to be invalid. Then, on October 12, 2021, pursuant to a separate stipulation between us and MSN, the Delaware District Court entered an order dismissing MSN’s counterclaims with respect to U.S. Patent No. 9,809,549. In our complaints, we are seeking, among other relief, an order that the effective date of any FDA approval of MSN’s ANDA be a date no earlier than the expiration of all of U.S. Patent Nos. 7,579,473, 8,497,284 and 8,877,776, the latest of which expires on October 8, 2030, and equitable relief enjoining MSN from infringing these patents. A bench trial has been scheduled for May 2022.
On January 11, 2022, we received notice from MSN that it had further amended its ANDA to assert additional Paragraph IV certifications. The ANDA now requests approval to market a generic version of CABOMETYX tablets prior to expiration of four previously-unasserted CABOMETYX patents that are now listed in the Orange Book: U.S. Patent Nos. 11,091,439 (salt and polymorphic forms) 11,091,440 (formulations) and 11,098,015 (methods of treatment). We have been drawn upon. All45 days from receipt of the January 11, 2022 notice to file a patent infringement claim against MSN relating to the newly challenged patents.
In May 2021, we received notice letters of credit are fully collateralized by certificates of deposit. The certificate of deposits usedfrom Teva Pharmaceuticals Development, Inc. and Teva Pharmaceuticals USA, Inc. (individually and collectively referred to collateralizeas Teva) regarding an ANDA Teva submitted to the standby letters of credit were included in short-term and long-term restricted cash and investments.FDA, requesting
We were previously required to provide collateral as part of an employee purchasing card program. The collateral requirement for the purchase card program at December 31, 2017 was $3.0 million. During 2018 we were notified that we had been released from this collateral requirement. The collateral was invested in certificates of deposit which were included in long-term restricted cash and investments.
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NOTE 12. QUARTERLY FINANCIAL DATA (UNAUDITED)approval to market a generic version of CABOMETYX tablets. Teva’s notice letters included a Paragraph IV certification with respect to our U.S. Patent Nos. 9,724,342 (formulations), 10,034,873 (methods of treatment) and 10,039,757 (methods of treatment), which are listed in the Orange Book and expire in 2033, 2031 and 2031, respectively. Teva’s notice letters did not provide a Paragraph IV certification against any additional CABOMETYX patents. On June 17, 2021, we filed a complaint in the Delaware District Court for patent infringement against Teva, along with Teva Pharmaceutical Industries Limited (Teva Parent), asserting infringement of U.S. Patent Nos. 9,724,342, 10,034,873 and 10,039,757 arising from Teva’s ANDA filing with the FDA. On August 27, 2021, Teva filed its answer and counterclaims to the complaint, alleging that the asserted claims of U.S. Patent Nos. 9,724,342, 10,034,873 and 10,039,757 are invalid and not infringed, and on August 23, 2021, we and Teva entered into a stipulation wherein Teva Parent was dismissed without prejudice from this lawsuit and agreed to be bound by any stipulation, judgment, order or decision rendered as to Teva, including any appeals and any order granting preliminary or permanent injunctive relief against Teva. On September 17, 2021, we filed an answer to Teva’s counterclaims. We are seeking, among other relief, an order that the effective date of any FDA approval of Teva’s ANDA be a date no earlier than the expiration of all of U.S. Patent Nos. 9,724,342, 10,034,873 and 10,039,757, the latest of which expires on July 9, 2033, and equitable relief enjoining Tevafrom infringing these patents. On February 8, 2022, the parties filed a stipulation to stay all proceedings, which was granted by the Delaware District Court on February 9, 2022. The stipulation and order were filed under seal.
The unaudited quarterlysale of any generic version of CABOMETYX earlier than its patent expiration could significantly decrease our revenues derived from the U.S. sales of CABOMETYX and thereby materially harm our business, financial data forcondition and results of operations. It is not possible at this time to determine the last two fiscal years was as follows (in thousands, except per share data): likelihood of an unfavorable outcome or estimate of the amount or range of any potential loss.
We may also from time to time become a party or subject to various other legal proceedings and claims, either asserted or unasserted, which arise in the ordinary course of business. Some of these proceedings have involved, and may involve in the future, claims that are subject to substantial uncertainties and unascertainable damages.
121
 Quarter Ended
 December 31, September 30, June 30, March 31,
2018:       
Total revenues (1)
$228,602
 $225,397
 $186,108
 $213,719
Gross profit (2)
$168,873
 $155,586
 $139,839
 $128,633
Income from operations$111,602
 $125,176
 $85,770
 $116,307
Net income$360,089
 $126,630
 $87,494
 $115,857
Net income per share, basic$1.20
 $0.42
 $0.29
 $0.39
Net income per share, diluted$1.15
 $0.41
 $0.28
 $0.37
2017:       
Total revenues$120,072
 $152,510
 $99,008
 $80,887
Gross profit (2)
$91,520
 $91,758
 $84,990
 $65,674
Income from operations$37,431
 $81,180
 $27,113
 $20,186
Net income$38,489
 $81,382
 $17,656
 $16,700
Net income per share, basic$0.13
 $0.28
 $0.06
 $0.06
Net income per share, diluted$0.12
 $0.26
 $0.06
 $0.05
____________________
(1)Total revenues for the three months ended March 31, 2018 have been adjusted to reflect the reclassification of the $1.4 million profit related to the profit sharing arrangement with Genentech for the commercialization of COTELLIC. For three months ended March 31, 2018, the net profit had been classified as Selling, general and administrative expenses as we were expecting an overall loss for the year ended December 31, 2018. During the three months ended June 30, 2018, we determined that the U.S. commercialization of COTELLIC would result in a profit for the year ended December 31, 2018 and therefore, we reclassified the profit for the three months ended March 31, 2018 from Selling, general and administrative expenses to Collaboration revenues to be consistent with presentation for the three and six months ended June 30, 2018. See “Note 3. Collaboration Agreements” for more information on our collaboration agreement with Genentech.
(2)Gross profit is computed as Net product revenues less Cost of goods sold.

Table of Contents

Item 9. Changes in and Disagreements Withwith Accountants on Accounting and Financial Disclosure
Not applicable.
Item 9A. Controls and Procedures
Evaluation of Disclosure Controls and Procedures. Based on the evaluation of our disclosure controls and procedures (as defined under Rules 13a-15(e) or 15d-15(e) under the Securities Exchange Act of 1934, as amended) required by Rules 13a-15(b) or 15d-15(b) under the Securities Exchange Act of 1934, as amended, our Chief Executive Officer and our Chief Financial Officer have concluded that as of the end of the period covered by this report, our disclosure controls and procedures were effective.
Limitations on the Effectiveness of Controls. A control system, no matter how well conceived and operated, can provide only reasonable, not absolute, assurance that the objectives of the control system are met. Because of inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that all control issues, if any, within an organization have been detected. Accordingly, our disclosure controls and procedures are designed to provide reasonable, not absolute, assurance that the objectives of our disclosure control system are met and, as set forth above, our principal executive officer and principalmet. Because of its inherent limitations, internal control over financial officer have concluded, based on theirreporting may not prevent or detect misstatements. Also, projections of any evaluation as of effectiveness to future periods are subject to the endrisk that controls may become inadequate because of the period covered by this report, that our disclosure controls and procedures were effective to provide reasonable assurancechanges in conditions, or that the objectivesdegree of our disclosure control system were met.compliance with the policies or procedures may deteriorate.
Management’s Report on Internal Control Over Financial Reporting. Our management is responsible for establishing and maintaining adequate internal control over financial reporting.reporting, as such term is defined in Exchange Act Rules 13a-15(f) and 15(d)-15(f). Our internal control over financial reporting is a process designed under the supervision of our principal executive and principal financial officers to provide reasonable assurance regarding the reliability of financial reporting and the preparation of our financial statements for external reporting purposes in accordance with U.S. generally accepted accounting principles.
As of the end of our 20182021 fiscal year, management conducted an assessment of the effectiveness of our internal control over financial reporting based on the framework established in the original Internal Control – Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) (COSO). Based on this assessment, management has determined that our internal control over financial reporting as of December 28, 201831, 2021 was effective. There were no material weaknesses in internal control over financial reporting identified by management.
The independent registered public accounting firm Ernst & Young LLP has issued an audit report on our internal control over financial reporting, which is included on the following page.
Changes in Internal Control Over Financial Reporting. There were no changes in our internal control over financial reporting that occurred during our most recent fiscal quarter that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.


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Report of Independent Registered Public Accounting Firm

To the Stockholders and the Board of Directors of Exelixis, Inc.

Opinion on Internal Control overOver Financial Reporting

We have audited Exelixis, Inc.’s internal control over financial reporting as of December 28, 2018,31, 2021, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) (the COSO criteria). In our opinion, Exelixis, Inc. (the Company) maintained, in all material respects, effective internal control over financial reporting as of December 28, 2018,31, 2021, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated balance sheets of the Company as of December 28, 201831, 2021 and December 29, 2017,January 1, 2021 and, the related consolidated statements of operations,income, comprehensive income, (loss), stockholders‘ equity (deficit) and cash flows for each of the three fiscal years in the period ended December 28, 2018,31, 2021, and the related notes and our report dated February 22, 201918, 2022 expressed an unqualified opinion thereon.

Basis for Opinion

The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Management's Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects.

Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

Definition and Limitations of Internal Control Over Financial Reporting

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 (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) 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 (3) 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/ Ernst & Young LLP

Redwood City, California
February 22, 201918, 2022
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Item 9B. Other Information

Between February 15, 2022 and February 16, 2022, we entered into new indemnification agreements with each of our directors and executive officers, the form of which is attached as Exhibit 10.1 to this Form 10-K. Pursuant to the indemnification agreement, we are required to indemnify the director or executive officer for all direct and indirect costs, including attorney’s fees, witness fees, and other out of pocket costs of whatever nature, incurred by the director or executive officer in any action or proceeding, whether actual, pending or threatened, subject to certain limitations, to which any of these people may be made a party by reason of the fact that he or she is or was a director or an executive officer of Exelixis or is or was serving or at any time serves at our request as a director, officer, employee or other agent of another corporation, partnership, joint venture, trust, employee benefit plan or other enterprise.

Item 9C. Disclosure Regarding Foreign Jurisdictions that Prevent Inspections

Not applicableapplicable.

PART III
ITEM 10.DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE
Item 10. Directors, Executive Officers and Corporate Governance
The information required by this item relating to our directors and nominees, including information with respect to our audit committee, audit committee financial experts and procedures by which stockholders may recommend nominees to our boardBoard of directors,Directors, is incorporated by reference to the section entitled “Proposal 1 – Election of Class II Directors” appearing in our Proxy Statement for our 20192022 Annual Meeting of Stockholders to be filed with the SEC within 120 days after December 28, 2018,31, 2021, which we refer to as our 20192022 Proxy Statement. The information required by this item regarding our executive officers is incorporated by reference to the section entitled “Executive“Information about our Executive Officers” appearing in our 20192022 Proxy Statement. The information, if any, required by this item regarding compliance with Section 16(a) of the Securities Exchange Act of 1934, as amended, is incorporated by reference to the section entitled “Section“Delinquent Section 16(a) Beneficial Ownership Reporting Compliance”Reports” appearing in our 20182022 Proxy Statement.
Code of Ethics
We have adopted a Corporate Code of Conduct that applies to all of our directors, officers and employees, including our principal executive officer, principal financial officer and principal accounting officer. The Corporate Code of Conduct is posted on our website at www.exelixis.com under the caption “Investors & Media—Corporate Governance—Corporate Governance Documents.Documents and information.
We intend to satisfy the disclosure requirement under Item 5.05 of Form 8-K regarding an amendment to, or waiver from, a provision of this Corporate Code of Conduct by posting such information on our website, at the address and location specified above and, to the extent required by the listing standards of the Nasdaq Stock Market, by filing a Current Report on Form 8-K with the SEC, disclosing such information.
Item 11. Executive Compensation
The information required by this item is incorporated by reference to the sections entitled “Compensation of Executive Officers,” “Compensation of Directors,” “Compensation Committee Interlocks and Insider Participation” and “Compensation Committee Report” appearing in our 20192022 Proxy Statement.
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Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters
The information required by this item relating to security ownership of certain beneficial owners and management is incorporated by reference to the section entitled “Security Ownership of Certain Beneficial Owners and Management” appearing in our 20192022 Proxy Statement.
Table of Contents

Equity Compensation Plan Information
The following table provides certain information about our common stock that may be issued upon the exercise of stock options and other rights under all of our existing equity compensation plans as of December 31, 2018,2021, which consists of our 2000 Equity Incentive Plan (the 2000 Plan) our 2000 Non-Employee Directors’ Stock Option Plan (the Director Plan) our 2000 Employee Stock Purchase Plan (the ESPP) our 2011 Equity Incentive Plan (the 2011 Plan), our 2014 Equity Incentive Plan (the 2014 Plan), our 2016 Inducement Award Plan (the 2016 Plan) and our 2017 Equity Incentive Plan (the 2017 Plan) and our 401(k) Plan: :
Plan Category 
Number of 
securities to be issued upon exercise of outstanding 
options, warrants and rights
 
Weighted-average exercise price of outstanding 
options, warrants and 
rights
 Number of securities remaining available for future issuance under equity compensation plans (excluding securities reflected in column (a))Plan Category
Number of 
securities to be issued upon exercise of outstanding 
options, warrants and rights
Weighted-average exercise price of outstanding 
options, warrants and 
rights
Number of securities remaining available for future issuance under equity compensation plans (excluding securities reflected in column (a))
 (a) (b) (c) (a)(b)(c)
Equity compensation plans approved by stockholders (1)
 27,242,369
 $7.10
(2) 
19,415,875
Equity compensation plans approved by stockholders (1)
26,658,364 $8.50 (2)14,172,938 
Equity compensation plans not approved by stockholders (3)
 289,027
 $14.34
(4) 
571,674
Equity compensation plans not approved by stockholders (3)
150,700 $19.72 — 
Total 27,531,396
 $7.17
 19,987,549
Total26,809,064 $8.56 14,172,938 
____________________
(1 )Equity plans approved by our shareholders are the 2000 Plan, the 2011 Plan,
(1)    Equity plans approved by our shareholders include the 2014 Plan, the Director Plan, the 2017 Plan and the ESPP. As of December 31, 2018, a total of 4,722,008 shares of our common stock remained available for issuance under the ESPP, and up to a maximum of 246,410 shares of our common stock may be purchased in the current purchase period. The shares issuable pursuant to our ESPP are not included in the number of shares to be issued pursuant to rights outstanding or and the weighted-average exercise price of such rights as of December 31, 2018, as those numbers are not known.

(2)The weighted-average exercise price takes into account the shares subject to outstanding restricted stock units (RSUs) which have no exercise price. The weighted-average exercise price, excluding such outstanding RSUs, is $8.61.

(3)Represents shares of our common stock issuable pursuant to the 2016 Plan and our 401(k) Plan.

As of December 31, 2018,2021, a total of 3,168,354 shares of our common stock remained available for issuance under the ESPP, and up to a maximum of 534,037 shares of our common stock may be purchased in the current purchase period. The shares issuable pursuant to our ESPP are not included in the number of shares to be issued pursuant to rights outstanding or and the weighted-average exercise price of such rights as of December 31, 2021, as those numbers are not known.
(2)    The weighted-average exercise price takes into account the shares subject to outstanding restricted stock units (RSUs), including such awards with performance conditions, which have no exercise price. The weighted-average exercise price, excluding such outstanding RSUs, is $16.76.
(3)    Represents shares of our common stock issuable pursuant to the 2016 Plan. As of December 31, 2021, no shares of our common stock remained available for issuanceadditional grants under the 2016 Plan. In November 2016, the Board adopted the 2016 Plan pursuant to which we reserved 1,500,000 shares of our common stock for issuance under the 2016 Plan. The only persons eligible to receive grants of Awards under the 2016 Plan are individuals who satisfy the standards for inducement grants under Nasdaq Marketplace Rule 5635(c)(4) and the related guidance under Nasdaq IM 5635-1 - that is, generally, a person not previously an employee or director of Exelixis, or following a bona fide period of non-employment, as an inducement material to the individual's entering into employment with Exelixis. An “Award” is any right to receive Exelixis common stock pursuant to the 2016 Plan, consisting of nonstatutorynon-statutory stock options, stock appreciation rights, restricted stock awards, RSUs, or any other stock award.


We sponsor a 401(k) Plan whereby eligible employees may elect to contribute up to the lesser of 50% of their annual compensation or the statutorily prescribed annual limit allowable under Internal Revenue Service regulations. The 401(k) Plan permits us to make matching contributions on behalf of all participants. During the year ended December 31, 2018, we matched 100% of the first $8,500 of participant contributions into our 401(k) Plan in the form of our common stock.

(4)The weighted-average exercise price takes into account the shares subject to outstanding RSUs, which have no exercise price. The weighted-average exercise price, excluding such outstanding RSUs, is $19.49.
Item 13. Certain Relationships and Related Transactions, and Director Independence
The information required by this item is incorporated by reference to the sections entitled “Certain Relationships and Related Party Transactions” and “Proposal 1 – Election of Class II Directors” appearing in our 20192022 Proxy Statement.
Item 14. Principal Accounting Fees and Services
The information required by this item is incorporated by reference to the section entitled “Proposal 2 – Ratification of Selection of Independent Registered Public Accounting Firm” appearing in our 20192022 Proxy Statement.
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PART IV
Item 15. Exhibits and Financial Statement Schedules
(a)The following documents are being filed as part of this report:
(1)     The following financial statements and the Report of Independent Registered Public Accounting Firm are included in Part II, Item 8:
(a)The following documents are being filed as part of this report:
(1)The following financial statements and the Report of Independent Registered Public Accounting Firm are included in Part II, Item 8:
 Page
(2)
(2)    All financial statement schedules are omitted because the information is inapplicable or presented in the Notes to Consolidated Financial Statements.
(3)The following Exhibits are filed as part of this report.
Exhibit
Number
 Exhibit Description Incorporation by Reference 
Filed
Herewith
Form File Number 
Exhibit/
Appendix
Reference
 Filing Date 
3.1  10-K 000-30235 3.1 3/10/2010  
3.2  10-K 000-30235 3.2 3/10/2010  
3.3  8-K 000-30235 3.1 5/25/2012  
3.4  8-K 000-30235 3.2 10/15/2014  
3.5  8-K 000-30235 3.1 10/15/2014  
3.6  8-K 000-30235 3.1 2/21/2019  
4.1  
S-1,
as amended
 333-96335 4.1 4/7/2000  
10.1†  
S-1,
as amended
 333-96335 10.1 3/17/2000  
10.2
  10-Q 000-30235 10.1 5/3/2007  
10.3
  10-Q 000-30235 10.2 11/8/2004  
10.4
  8-K 000-30235 10.1 12/15/2004  
10.5
  10-K 000-30235 10.6 2/20/2014  
(3)    The following Exhibits are filed as part of this report.
Exhibit
Number
Exhibit DescriptionIncorporation by Reference
Filed
Herewith
FormFile Number
Exhibit/
Appendix
Reference
Filing Date
3.110-Q000-302353.18/5/2021
3.28-K000-302353.13/3/2021
4.110-Q333-963354.18/5/2021
4.2X
10.1†X
10.2
Schedule 14A000-30235A4/13/2016
10.3
10-Q000-3023510.18/6/2020
10.4
10-Q000-3023510.27/31/2014
10.5
10-Q000-3023510.47/31/2014
10.6
10-Q000-3023510.57/31/2014
10.7
10-Q000-3023510.28/6/2020
10.8
8-K000-3023510.211/22/2016
10.9
8-K000-3023510.211/22/2016
126


Exhibit
Number
Exhibit DescriptionIncorporation by Reference
Filed
Herewith
FormFile Number
Exhibit/
Appendix
Reference
Filing Date
10.10
10-Q000-3023510.38/6/2020
10.11
10-K00-3023510.112/11/2021
10.12
10-K000-3023510.222/26/2018
10.13
10-Q000-3023510.58/6/2020
10.14
10-Q000-3023510.68/6/2020
10.15
10-Q000-3023510.45/5/2020
10.16
10-Q000-3023510.438/5/2004
10.17
10-Q000-3023510.511/10/2015
10.18
X
10.19
10-Q000-3023510.45/1/2014
10.20
10-K000-3023510.242/29/2016
10.21
10-K000-3023510.262/27/2017
10.22
8-K000-3023510.12/16/2018
10.23
10-K000-3023510.292/25/2020
10.24
10-Q000-3023510.55/2/2018
10.25
10-Q000-3023510.45/1/2019
10.2610-Q000-3023510.18/2/2017
10.2710-K000-3023510.392/26/2018
10.2810-Q000-3023510.28/1/2018
127

Exhibit
Number
Exhibit DescriptionIncorporation by Reference
Filed
Herewith
FormFile Number
Exhibit/
Appendix
Reference
Filing Date
10.298-K000-3023510.14/5/2019
10.3010-Q000-3023510.310/30/2019
10.3110-K000-3023510.372/25/2020
10.3210-K000-3023510.322/10/2021
10.3310-Q000-3023510.210/30/2019
10.3410-K000-3023510.392/25/2020
10.35**10-Q000-3023510.15/6/2021
10.36**10-Q000-3023510.25/6/2021
10.37**10-Q000-3023510.35/6/2021
10.38**10-Q000-3023510.45/6/2021
10.39**10-Q000-3023510.55/6/2021
10.40**10-Q000-3023510.65/6/2021
128

Exhibit
Number
Exhibit DescriptionIncorporation by Reference
Filed
Herewith
FormFile Number
Exhibit/
Appendix
Reference
Filing Date
10.6
10.41**
10-K000-3023510.72/22/2011
10.7
Schedule 14A000-30235A4/13/2016
10.8
X
10.9
10-Q000-3023510.38/4/2011
10.10
8-K000-3023510.15/29/2014X
10.11
10-Q000-3023510.27/31/2014
10.12
10-Q000-3023510.47/31/2014
10.13
10-Q000-3023510.57/31/2014
10.14
8-K000-3023510.110/16/2014
10.15
X
10.16
8-K000-3023510.211/22/2016
10.17
8-K000-3023510.211/22/2016
10.18
10-K000-3023510.202/26/2018
10.19
10-K000-3023510.212/26/2018
10.20
10-K000-3023510.222/26/2018
10.21
10-K000-3023510.232/26/2018
10.22
10-K000-3023510.242/26/2018
10.23
10-K000-3023510.252/26/2018
10.24
10-Q000-3023510.4310.28/5/20047/31/2019
10.25
10.42**
10-Q000-3023510.511/10/2015X
10.43*10-Q/A000-3023510.17/14/2017
10.44*10-Q000-3023510.18/1/2018
10.45**10-Q000-3023510.37/31/2019
10.46**10-Q000-3023510.111/5/2020
10.47**10-K000-3023510.622/25/2020
21.1X
23.1X
24.1X
31.1X
31.2X
32.1‡X
101.INSXBRL Instance DocumentThe XBRL instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
101.SCHInline XBRL Taxonomy Extension Schema DocumentX
101.CALInline XBRL Taxonomy Extension Calculation Linkbase DocumentX
129


Exhibit
Number
 Exhibit Description Incorporation by Reference 
Filed
Herewith
Form File Number 
Exhibit/
Appendix
Reference
 Filing Date 
10.26
  8-K 000-30235 10.1 6/26/2006  
10.27
  10-Q 000-30235 10.4 5/1/2014  
10.28
  10-K 000-30235 10.24 2/29/2016  
10.29
  10-K 000-30235 10.26 2/27/2017  
10.30
  10-Q 000-30235 10.1 11/4/2010  
10.31
  8-K 000-30235 10.1 2/16/2018  
10.32
          X
10.33
  10-Q 000-30235 10.5 5/2/2018  
10.34  10-Q 000-30235 10.1 8/2/2017  
10.35  10-K 000-30235 10.39 2/26/2018  
10.36  10-Q 000-30235 10.2 8/1/2018  
10.37*  10-K 000-30235 10.45 2/27/2017  
10.38  10-K 000-30235 10.46 2/27/2017  

Exhibit
Number
 Exhibit Description Incorporation by Reference 
Filed
Herewith
Form File Number 
Exhibit/
Appendix
Reference
 Filing Date 
10.39  10-K 000-30235 10.47 2/27/2017  
10.40**          X
10.41*  10-Q/A 000-30235 10.3 9/30/2016  
10.42*  10-K 000-30235 10.49 2/27/2017  
10.43*  10-Q 000-30235 10.2 11/1/2017  
10.44*  10-K 000-30235 10.46 2/26/2018  
10.45*  10-Q/A 000-30235 10.4 9/30/2016  
10.46*  10-K 000-30235 10.48 2/26/2018  
10.47*  10-K 000-30235 10.51 2/27/2017  
10.48*  10-K 000-30235 10.52 2/27/2017  

Exhibit
Number
 Exhibit Description Incorporation by Reference 
Filed
Herewith
Form File Number 
Exhibit/
Appendix
Reference
 Filing Date 
10.49  10-Q 000-30235 10.5 8/5/2010  
10.50 *  10-Q 000-30235 10.5 8/2/2017  
10.51*  10-Q/A 000-30235 10.1 7/14/2017  
10.52*  10-Q 000-30235 10.1 8/1/2018  
10.53*  10-Q 000-30235 10.2 5/1/2017  
10.54*  10-Q 000-30235 10.3 5/1/2017  
10.55*  10-Q 000-30235 10.1 11/1/2018  
10.56*  10-Q 000-30235 10.2 11/1/2018  
10.57*  10-Q 000-30235 10.3 11/1/2018  
21.1          X
23.1          X
24.1          X
31.1          X

Exhibit
Number
Exhibit DescriptionIncorporation by Reference
Filed
Herewith
FormFile Number
Exhibit/
Appendix
Reference
Filing Date
31.2101.DEFX
32.1‡X
101.INSXBRL Instance DocumentX
101.SCHXBRL Taxonomy Extension Schema DocumentX
101.CALXBRL Taxonomy Extension Calculation Linkbase DocumentX
101.DEFInline XBRL Taxonomy Extension Definition Linkbase DocumentX
101.LABInline XBRL Taxonomy Extension Labels Linkbase DocumentX
101.PREInline XBRL Taxonomy Extension Presentation Linkbase DocumentX
104Cover Page Interactive Data FileFormatted as Inline XBRL and contained in Exhibit 101.
Management contract or compensatory plan.
*Confidential treatment granted for certain portions of this exhibit.
**Confidential treatment requested for certain portionsPortions of this exhibit.exhibit have been omitted as being immaterial and would be competitively harmful if publicly disclosed.
This certification accompanies this Annual Report on Form 10-K, is not deemed filed with the SEC and is not to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended (whether made before or after the date of this Annual Report on Form 10-K), irrespective of any general incorporation language contained in such filing.
ITEM 16.    FORM 10-K SUMMARY
 None provided.
130


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
EXELIXIS, INC.
February 18, 2022By:
EXELIXIS, INC./s/ MICHAEL M. MORRISSEY
Date
February 22, 2019By:
/s/    MICHAEL M. MORRISSEY        
DateMichael M. Morrissey, Ph.D.
President and Chief Executive Officer


POWER OF ATTORNEY
KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints MICHAEL M. MORRISSEY, CHRISTOPHER J. SENNER and JEFFREY J. HESSEKIEL and each or any one of them, his or her true and lawful attorney-in-fact and agent, with full power of substitution and resubstitution, for him or her and in his or her name, place and stead, in any and all capacities, to sign any and all amendments (including post-effective amendments) to this report on Form 10-K, and to file the same, with all exhibits thereto, and other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in connection therewith, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents, or any of them, or their or his or her substitutes or substitute, may lawfully do or cause to be done by virtue hereof.
Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed by the following persons on behalf of the Registrant and in the capacities and on the dates indicated.
SignaturesTitle Date
/s/ MICHAELM. MORRISSEY
Director, President and
     Chief Executive Officer
February 22, 201918, 2022
Michael M. Morrissey, Ph.D.     (Principal Executive Officer)
/s/ CHRISTOPHERJ. SENNER
Executive Vice President and
     Chief Financial Officer
February 22, 201918, 2022
Christopher J. Senner
     (Principal Financial and
     Accounting Officer)
/s/ STELIOS PAPADOPOULOS
Chairman of the BoardFebruary 22, 201918, 2022
Stelios Papadopoulos, Ph.D.
/s/ CHARLESCOHEN
DirectorFebruary 22, 201918, 2022
Charles Cohen, Ph.D.
/s/    CARL B. FELDBAUM        
DirectorFebruary 22, 2019
Carl B. Feldbaum, Esq.
/s/ MARIA C. FREIRE
DirectorFebruary 22, 2019
Maria C. Freire, Ph.D.

Signatures
/s/ CARL B. FELDBAUM
TitleDirectorDateFebruary 18, 2022
Carl B. Feldbaum, Esq.
/s/ MARIA C. FREIRE
DirectorFebruary 18, 2022
Maria C. Freire, Ph.D.
131

SignaturesTitleDate
/s/ ALAN M. GARBER
DirectorFebruary 22, 201918, 2022
Alan M. Garber, M.D., Ph.D.
/s/ VINCENT T. MARCHESI
DirectorFebruary 22, 201918, 2022
Vincent T. Marchesi, M.D., Ph.D.
/s/ GEORGE POSTE
DirectorFebruary 22, 201918, 2022
George Poste, DVM, Ph.D., FRS
/s/ GEORGEJULIE A. SCANGOS        MITH
DirectorFebruary 22, 201918, 2022
GeorgeJulie A. Scangos, Ph.D.Smith
/s/ JULIE A. SMITH    LANCE WILLSEY
DirectorFebruary 22, 201918, 2022
Julie A. SmithLance Willsey, M.D.
/s/ LANCEJACQUELINE WILLSEY        RIGHT
DirectorFebruary 22, 201918, 2022
Lance Willsey, M.D.Jacqueline Wright
/s/ JACK L. WYSZOMIERSKI
DirectorFebruary 22, 201918, 2022
Jack L. Wyszomierski

127132