Iron Mountain (IRM) 8-K Iron Mountain Reports Fourth Quarter and Full Year 2016 Results

www.ironmountain.com Supplemental Financial Information Fourth Quarter 2016 Unaudited

www.ironmountain.com Selected metric definitions are available in the Appendix Safe Harbor Statement 2 Safe Harbor Statement Under the Private Securities Litigation Reform Act of 1995: This presentation contains certain forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 and other securities laws and is subject to the safe-harbor created by such Act. Forward-looking statements include, but are not limited to, our financial performance outlook and statements concerning our operations, economic performance, financial condition, goals, beliefs, future growth strategies, investment objectives, plans and current expectations, such as 2017 guidance, the expected total cost to integrate Recall Holdings Limited (“Recall”) with our company and expected synergies from the acquisition of Recall, strategic goals, and expected cost savings associated with the Transformation Initiative. These forward-looking statements are subject to various known and unknown risks, uncertainties and other factors. When we use words such as "believes," "expects," "anticipates," "estimates" or similar expressions, we are making forward-looking statements. Although we believe that our forward-looking statements are based on reasonable assumptions, our expected results may not be achieved, and actual results may differ materially from our expectations. In addition, important factors that could cause actual results to differ from expectations include, among others: (i) our ability to remain qualified for taxation as a real estate investment trust for U.S. federal income tax purposes ("REIT"); (ii) the adoption of alternative technologies and shifts by our customers to storage of data through non-paper based technologies; (iii) changes in customer preferences and demand for our storage and information management services; (iv) the cost to comply with current and future laws, regulations and customer demands relating to privacy issues, as well as fire and safety standards; (v) the impact of litigation or disputes that may arise in connection with incidents in which we fail to protect our customers' information; (vi) changes in the price for our storage and information management services relative to the cost of providing such storage and information management services; (vii) changes in the political and economic environments in the countries in which our international subsidiaries operate; (viii) our ability or inability to complete acquisitions on satisfactory terms and to integrate acquired companies efficiently; (ix) changes in the amount of our capital expenditures; (x) changes in the cost of our debt; (xi) the impact of alternative, more attractive investments on dividends; (xii) the cost or potential liabilities associated with real estate necessary for our business; (xiii) the performance of business partners upon whom we depend for technical assistance or management expertise outside the United States; (xiv) other trends in competitive or economic conditions affecting our financial condition or results of operations not presently contemplated; and (xv) other risks described more fully in our filings with the Securities and Exchange Commission, including under the caption “Risk Factors” in our periodic reports, or incorporated therein. You should not rely upon forward-looking statements except as statements of our present intentions and of our present expectations, which may or may not occur. Except as required by law, we undertake no obligation to release publicly the result of any revision to these forward-looking statements that may be made to reflect events or circumstances after the date hereof or to reflect the occurrence of unanticipated events. Reconciliation of Non-GAAP Measures: Throughout this presentation, Iron Mountain will discuss (1) Adjusted EBITDA, (2) Adjusted Earnings per Share (“Adjusted EPS”), (3) Funds from Operations (“FFO NAREIT”), (4) FFO (Normalized) and (5) Adjusted Funds from Operations (“AFFO”). These measures do not conform to accounting principles generally accepted in the United States (“GAAP”). These non-GAAP measures are supplemental metrics designed to enhance our disclosure and to provide additional information that we believe to be important for investors to consider in addition to, but not as a substitute for, other measures of financial performance reported in accordance with GAAP, such as operating income, income (loss) from continuing operations, net income (loss) or cash flows from operating activities from continuing operations (as determined in accordance with GAAP). The reconciliation of these measures to the appropriate GAAP measure, as required by Regulation G under the Securities Exchange Act of 1934, as amended, and the definitions are included later in this document (see Table of Contents). Iron Mountain does not provide a reconciliation of non-GAAP measures that it discusses as part of its annual guidance or long term outlook because certain significant information required for such reconciliation is not available without unreasonable efforts or at all, including, most notably, the impact of exchange rates on Iron Mountain’s transactions, loss or gain related to the disposition property, plant and equipment (including of real estate) and other income or expense. Without this information, Iron Mountain does not believe that a reconciliation would be meaningful.

www.ironmountain.com Selected metric definitions are available in the Appendix All figures except per share and facility counts in 000s unless noted All figures in reported dollars unless noted Figures may not foot due to rounding Table of Contents 3 Investor Relations Contacts: Faten Freiha, 617-535-8404 Director, Investor Relations faten.freiha@ironmountain.com Melissa Marsden, 617-535-8595 Senior Vice President, Investor Relations melissa.marsden@ironmountain.com Section I - Company Profile 4 Section II - Financial Highlights and Guidance 5 - 7 Section III - Operating Metrics 8 - 12 Section IV - Balance Sheets, Statements of Operations and Reconciliations 13 - 22 Section V - Storage Net Operating Income and EBITDA, and Service Business EBITDA 23 - 25 Section VI - Real Estate Metrics 26 - 31 Section VII - Debt Schedule and Capitalization 32 - 33 Section VIII - Capital Expenditures and Investments 34 - 35 Section IX - Components of Value 36 Section X - Appendix and Definitions 37 - 49

www.ironmountain.com Selected metric definitions are available in the Appendix Product Company Profile Iron Mountain is a global leader in enterprise storage with a high-return, real estate-based business model, yielding annualized revenue of over $3.7 billion. The company provides storage and information management services to a high-quality, diversified customer base across numerous industries and government organizations. As of 12/31/16 Iron Mountain serves more than 230,000 customers, including approximately 95% of the Fortune 1000, and no single customer accounts for more than 1% of revenues, or 2% of volume. Iron Mountain provides storage and information management services in 45 countries on six continents, storing approximately 680 million cubic feet of records in a portfolio of more than 1,400 facilities totaling more than 85 million square feet of space. The company employs more than 24,000 people. Iron Mountain is organized as a REIT, and its financial model is based on the recurring nature of its storage rental revenues and resulting storage net operating income (NOI). Supported by consistent storage rental revenues, the company generates predictable, low-volatility growth in key metrics such as storage NOI and AFFO. This fundamental financial characteristic provides stability through economic cycles. Iron Mountain has the opportunity to invest capital at attractive returns both domestically and internationally. The company believes that there remains a large un-vended opportunity that can support sustained storage volumes in developed markets such as North America and high growth opportunities in emerging markets where customers are in early stages of outsourcing their storage of physical documents. Diversification of Total Revenues (For the Year Ended 12/31/2016) 4 Countries Served (1) Includes South Africa. (2) Includes Fulfillment Services, Information Governance and Digital Solutions, Technology Escrow Services, Data Center, Consulting, Entertainment Services, Fine Art Storage, Consumer Storage and other ancillary services. 7% 7% 17% 68% 10% 9% 14% 66% Asia Pacific Latin America Europe North America Other Shredding Data Protection Records Mgmt Strong Track Record of Storage Rental Revenue Growth $2,143 ’01’00’99’98’97’96’95’94’93’92’91’90’89 ’14’13’12’11’10’09’08’07’06’05’04’03’02 ’16’15 (2) Region (1) 27-year Compound Annual Growth Rate 16.5% 39% 61% Service Storage Mix S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I S e c t i o n X M

www.ironmountain.com Selected metric definitions are available in the Appendix Financial Highlights 5 (1) Please see slide 24 for Storage Net Operating Income reconciliation. (2) We changed the name of the Adjusted OIBDA metric to Adjusted EBITDA. The metric results in the same number as the prior metric and did not require any restatements. Please see page 15 for reconciliation. (3) Beginning in 2017, our definition of AFFO will include revenue reduction associated with amortization of permanent withdrawal fees. Please see page 38 of the Appendix for a reconciliation to the new definition. (4) Reflects additional 50.2mm shares of common stock issued in connection with the Recall acquisition in Q2 2016. S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n I V S e c t i o n I I I S e c t i o n X S e c t i o n I I S e c t i o n I Q4 2015 Q4 2016 % Change Full Year 2015 Full Year 2016 % Change Storage Rental $457,764 $566,547 23.8% $1,837,897 $2,142,905 16.6% Service 294,663 367,646 24.8% 1,170,079 1,368,548 17.0% Total Revenues $752,427 $934,193 24.2% $3,007,976 $3,511,453 16.7% Gross Profit $428,002 $517,978 21.0% $1,717,951 $1,943,676 13.1% Gross Margin 56.9% 55.4% -150 bps 57.1% 55.4% -170 bps Gross Profit $428,002 $517,978 21.0% $1,717,951 $1,943,676 13.1% Less: Recall Costs included in Cost of Sales - 7,175 n/a - 11,963 n/a Adjusted Gross Profit $428,002 $525,153 22.7% $1,717,951 $1,955,639 13.8% Adjusted Gross Profit Margin 56.9% 56.2% -70 bps 57.1% 55.7% -140 bps Storage and Service Profit and Margin Storage Gross Profit $347,882 $424,478 22.0% 1,406,990 1,605,665 14.1% Storage Gross Margin 76.0% 74.9% -110 bps 76.6% 74.9% -170 bps Service Gross Profit $80,119 $100,675 25.7% 310,961 349,976 12.5% Service Gross Margin 27.2% 27.4% 20 bps 26.6% 25.6% -100 bps Storage Net Operating Income (NOI)(1) $375,376 $468,616 24.8% $1,496,155 $1,759,575 17.6% SG&A Costs $216,968 $250,545 15.5% $844,960 $988,332 17.0% Less: Recall Costs Included in SG&A $26,690 $21,897 (18.0%) $47,014 $119,981 n/a Adjusted SG&A Costs $190,278 $228,648 0.0% $797,946 $868,351 8.8% Adjusted SG&A Margin 25.3% 24.5% -80 bps 26.5% 24.7% -180 bps Income (Loss) from Continuing Operations $5,940 $49,800 n/a $125,203 $103,880 (17.0%) Adjusted EBITDA(2) $237,724 $296,505 24.7% $920,005 $1,087,288 18.2% Adjusted EBITDA Margin(2) 31.6% 31.7% 10 bps 30.6% 31.0% 40 bps Reported EPS - Fully Diluted from Continuing Operations $0.03 $0.19 n/a $0.59 $0.41 (30.5%) Adjusted EPS $0.33 $0.26 (21.2%) $1.21 $1.07 (11.6%) Net Income (Loss) $5,940 $49,525 n/a $125,203 $107,233 (14.4%) AFFO(3) $126,229 $163,962 29.9% $529,693 $648,451 22.4% Ordinary Dividends per Share $0.485 $0.550 13.4% $1.910 $2.005 4.8% Weighted Average Fully-diluted Shares Outstanding(4) 212,232 264,506 24.6% 212,118 247,267 16.6%

www.ironmountain.com Selected metric definitions are available in the Appendix 2016 Performance vs. Guidance 6 (1) The 2016 C$ Budget Rate was set in January 2016. (2) Based on full year weighted average 247mm shares outstanding. (3) Excludes $7.4mm of Recall Integration CapEx. (4) Excludes $9.7mm of Recall Integration CapEx. (5) Excludes $1.2mm of Recall Integration CapEx. (6) Excludes the acquisition of Recall. Financial Performance Outlook $MM (except per share items) S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I S e c t i o n X 2016 Guidance as of 11/1/2016 FY 2016 Results Actual R$ % Growth R$ FY 2016 Results Actual C$( 1) % Growth C$ Revenue $3,450 - $3,550 $3,511 16.7% $3,481 19.0% Adjusted EBITDA $1,075 - $1,110 $1,087 18.2% $1,077 19.7% Adjusted EPS – Fully Diluted(2) $1.10 - $1.20 $1.07 $1.07 FFO (Normalized) $450 - $470 $474 $471 FFO (Normalized) per share(2) $1.82 - $1.90 $1.92 $1.90 AFFO $610 - $650 $648 $645 2016 Guidance as of 11/1/2016 FY 2016 Results Actual R$ Real Estate Investment(3) $225 $196 Non-Real Estate Investment(4) $60 $41 Real Estate and Non-Real Estate Maintenance(5) $85 $83 Business and Acquisitions of Customer Relationships(6) $140 - $180 $78 Total Capital Expenditures and Investments (ex dividends) $510 - $550 $398

www.ironmountain.com Selected metric definitions are available in the Appendix 2017 Guidance Summary(1) 7 (1) Iron Mountain does not provide a reconciliation of non-GAAP measures that it discusses as part of its annual guidance or long term outlook because certain significant information required for such reconciliation is not available without unreasonable efforts or at all, including, most notably, the impact of exchange rates on Iron Mountain’s transactions, loss or gain related to the disposition of real estate and other income or expense. Without this information, Iron Mountain does not believe that a reconciliation would be meaningful. (2) The 2017 C$ Budget rate was set in January 2017. (3) Assumes internal storage rental revenue growth of 2.0% to 2.5%. (4) Assumes full year weighted average shares outstanding of 265mm and 18% - 20% structural tax rate. (5) Beginning in 2017 we will revise our AFFO definition, per the reconciliation on page 38. AFFO 2016 Actual and AFFO 2017 Guidance in this table reflect the new definition. AFFO 2017 Guidance excludes Recall related CapEx. Financial Performance Outlook $MM (except per share items) S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I S e c t i o n X Note: 2017 Guidance assumes: • Maintenance CapEx and non-real estate investment of $150-$170mm. • Business and acquisitions of customer relationships of $160-$180mm 2016 Actuals R$ 2016 Actuals w ith 2017 Rate 2017 Guidance(2) 2017 % Change YOY Revenue(3) $3,511 $3,476 $3,750 - $3,840 8% - 10% Adjusted EBITDA $1,087 $1,076 $1,250 -$1,280 16% - 19% Adjusted EPS – Fully Diluted(4) $1.07 $1.06 $1.15 - $1.25 8% - 18% AFFO - New Definition(5) $669 $663 $715 - $760 8% - 15%

www.ironmountain.com Selected metric definitions are available in the Appendix Year-over-Year Revenue Growth 8 61.0% 39.0% Service Storage Rental 82.1% 17.9% Service Storage Rental FY 2016 Revenue FY 2016 Gross Profit S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n I V S e c t i o n X S e c t i o n I I I S e c t i o n I I S e c t i o n I (1) Full Year 2016 results reflect corrected Q3 2016 internal growth figures. Please see page 37 in the Appendix. Revenue Growth Rates Reported 23.8% 24.8% 24.2% 16.6% 17.0% 16.7% Less: Impact of FX Rate Changes and Adjustments (1.4)% (1.7)% (1.5)% (2.1)% (2.5)% (2.2)% Constant Currency 25.2% 26.4% 25.7% 18.7% 19.4% 19.0% Less: Impact of Acquisitions and Dispositions 22.4% 27.3% 24.3% 16.3% 20.0% 17.8% Internal Growth Rate 2.9% (0.9)% 1.4% 2.3% (0.6)% 1.2% Service Revenue Total Revenue Q4 2016 Full Year 2016(1) Storage Rental Revenue Service Revenue Total Revenue Storage Rental Revenue

www.ironmountain.com Selected metric definitions are available in the Appendix Records Management Volume Growth 9 ‐4.4% ‐4.4% ‐4.5% ‐4.6% ‐4.8% ‐4.8% ‐4.9% ‐5.0% ‐2.0% ‐2.1% ‐2.1% ‐2.1% ‐2.0% ‐2.1% ‐2.2% ‐2.3% 5.9% 5.9% 5.7% 5.8% 5.8% 6.0% 6.2% 6.3% 2.4% 2.3% 2.4% 2.6% 2.6% 2.7% 2.8%2.5% 1.6%1.6% 24.6% Q3‐16A 29.2% 27.4% Q2‐16A 27.6% Q1‐16A 3.2% Q4‐15A 2.3% 0.7% Q3‐15A 2.7% 1.1% Q2‐15A 2.8% 1.0% Q1‐15A 3.5% Q4‐16A 26.3% 25.9% Outperm/TermsDestructionsNew Volume from Existing CustomersNew Sales Business Acquisitions Total Iron Mountain (676 CuFt MM) North America (417 CuFt MM) (2) (1) Represents CuFt acquired at close. CuFt activity post close flows through new sales, new volume from existing customers, destructions, outperms / terms as appropriate. (2) Acquisitions of customer relationships are included in new sales as the nature of these transactions is similar to new customer wins. 13.8% 61.7% 24.6% S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n I V S e c t i o n X (1) S e c t i o n I I I S e c t i o n I I S e c t i o n I 10.6% 10.5% 5.0% 1.6% Q4‐16A 5.2% ‐1.5% ‐5.1% Q3‐16A 11.8% ‐1.5% 1.9% 11.4% Q2‐16A 11.6% ‐1.6% ‐5.1% 5.1% ‐5.1% 1.7% 11.5% Q1‐16A 0.5% ‐1.7% ‐5.0% 5.0% 1.8% 0.3% Q4‐15A 1.2% ‐1.8% ‐4.8% 5.0% 1.8% 1.0% Q3‐15A 1.1% ‐1.8% ‐4.7% 4.9% 1.7% 1.0% Q2‐15A 1.2% ‐1.8% ‐4.5% 5.1% 1.6% 0.8% Q1‐15A 1.2% ‐1.7% ‐4.6% 5.1% 1.7% 0.7% 13.8% 24.6% 61.7% Western Europe North America Other International Percentage of Total Cubic Volume at 12/31/16

www.ironmountain.com Selected metric definitions are available in the Appendix Records Management Volume Growth 10 3.6% ‐2.7% ‐5.8% 6.3% 4.9% 45.7% Q3‐16A 49.3% ‐2.7% ‐4.3% 5.8% 4.4% 46.1% Q2‐16A 37.8% ‐2.6% ‐3.9% 5.5% 34.1% 4.8% Q4‐16A 48.4% Q1‐16A 3.0% ‐2.3% ‐4.1% 5.0% 4.4% Q4‐15A 3.1% ‐2.1% ‐4.4% 5.1% 4.5% Q3‐15A 3.9%(1) ‐2.2% ‐4.6% 5.3% 4.7% 0.7% Q2‐15A 3.0% ‐2.1% ‐4.6% 5.4% 3.7% 0.7% Q1‐15A 5.4% ‐2.3% ‐4.5% 5.6% 5.0% 1.6% Outperm/TermsDestructionsNew Volume from Existing CustomersNew Sales Business Acquisitions Western European (93 CuFt MM) (1) Other International (166 CuFt MM) (1) 75.1% ‐5.3% ‐4.4% 11.4% 5.9% 67.5% Q3‐16A Q4‐16A ‐4.5% ‐4.6% 10.5% 5.2% 86.9% 80.4% Q2‐16A 87.0% ‐3.7% ‐4.3% 9.9% 4.8% 80.2% Q1‐16A 14.6% ‐3.3% ‐4.2% 9.5% 4.5% 8.2% Q4‐15A 6.0% ‐3.2% ‐4.2% 9.5% 4.0% Q3‐15A 8.4%(1) ‐3.3% ‐3.6% 9.6% 4.2% 1.4% Q2‐15A 9.6% ‐3.4% ‐3.4% 9.8% 4.2% 2.4% Q1‐15A 12.9% ‐3.2% ‐3.4% 9.9% 4.1% 5.5% (2) (1) Represents CuFt acquired at close. CuFt activity post close flows through new sales, new volume from existing customers, destructions, outperms / terms as appropriate. (2) Acquisitions of customer relationships are included in new sales as the nature of these transactions is similar to new customer wins. S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I S e c t i o n X (1) 24.6% 13.8% 61.7% 24.6% 13.8% 61.7% Percentage of Total Cubic Volume at 12/31/16

www.ironmountain.com Selected metric definitions are available in the Appendix Quarterly Operating Performance 11 S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n X S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I Q4 Results % Growth Q4 2015 Q4 2016 Reported - Impact of FX Rate Changes and Adjustments = Constant Currency - Impact of Acquisitions and Dispositions = Internal Growth NA Records and Information Management Business Storage Rental $268,266 $297,463 10.9% (0.3)% 11.2% 9.2% 1.9% Service 174,288 207,108 18.8% (0.1)% 18.9% 17.6% 1.3% Total Revenues $442,554 $504,571 14.0% (0.2)% 14.2% 12.5% 1.7% Adjusted EBITDA 181,041 210,463 Adjusted EBITDA Margin 40.9% 41.7% NA Data Management Business Storage Rental $63,734 $72,512 13.8% 1.3% 12.5% 9.5% 3.0% Service 32,532 34,572 6.3% (9.6)% 6.1% 12.9% (6.9)% Total Revenues $96,266 $107,084 11.2% 0.9% 10.3% 10.7% (0.3)% Adjusted EBITDA 51,625 58,231 Adjusted EBITDA Margin 53.6% 54.4% Western European Business Storage Rental $59,645 $71,733 20.3% (14.7)% 34.9% 34.1% 0.9% Service 41,531 47,619 14.7% (12.4)% 27.1% 35.4% (8.3)% Total Revenues $101,176 $119,352 18.0% (13.7)% 31.7% 34.6% (2.9)% Adjusted EBITDA 33,503 34,741 Adjusted EBITDA Margin 33.1% 29.1% Other International Business Storage Rental $59,288 $114,098 92.4% 0.7% 91.7% 83.4% 8.4% Service 44,694 74,324 66.3% (1.0)% 67.3% 65.6% 1.7% Total Revenues $103,982 $188,422 81.2% (0.1)% 81.3% 75.7% 5.6% Adjusted EBITDA 24,198 51,691 Adjusted EBITDA Margin 23.3% 27.4% Corporate and Other Business Storage Rental $6,831 $10,740 57.2% 0.0% 57.2% 45.2% 12.0% Service 1,618 4,024 148.7% 0.0% 148.7% 143.1% 5.7% Total Revenues $8,449 $14,764 74.7% 0.0% 74.7% 64.0% 10.8% Adjusted EBITDA (52,643) (58,621) Total Storage Rental $457,764 $566,547 23.8% (1.4)% 25.2% 22.4% 2.9% Service 294,663 367,646 24.8% (1.7)% 26.4% 27.3% (0.9)% Total Revenues $752,427 $934,193 24.2% (1.5)% 25.7% 24.3% 1.4% Adjusted EBITDA 237,724 296,505

www.ironmountain.com Selected metric definitions are available in the Appendix 12 Full Year Operating Performance S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n X S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I (1) Full year 2016 results reflect corrected Q3 2016 internal growth. Please see page 37 of the Appendix. Full Year Results % Growth Full Year 2015 Full Year 2016 Reported - Impact of FX Rate Changes and Adjustments = Constant Currency - Impact of Acquisitions and Dispositions = Internal Growth NA Records and Information Management Business Storage Rental $1,077,305 $1,150,646 6.8% (0.6)% 7.5% 6.5% 1.0% Service 698,060 780,053 11.7% (0.6)% 12.3% 11.3% 1.0% Total Revenues $1,775,365 $1,930,699 8.7% (0.6)% 9.4% 8.4% 1.0% Adjusted EBITDA 714,639 775,717 Adjusted EBITDA Margin 40.3% 40.2% NA Data Management Business Storage Rental $255,601 $280,114 9.6% 1.0% 8.6% 6.6% 2.0% Service 134,885 134,060 (0.6)% 0.2% (0.8)% 9.0% (9.8)% Total Revenues $390,486 $414,174 6.1% 0.7% 5.4% 7.4% (2.0)% Adjusted EBITDA 203,803 228,486 Adjusted EBITDA Margin 52.2% 55.2% Western European Business Storage Rental $239,257 $275,659 15.2% (8.6)% 23.8% 23.0% 0.8% Service 158,256 178,552 12.8% (7.6)% 20.4% 26.0% (5.6)% Total Revenues $397,513 $454,211 14.3% (8.2)% 22.5% 24.2% (1.7)% Adjusted EBITDA 120,649 137,506 Adjusted EBITDA Margin 30.4% 30.3% Other International Business(1) Storage Rental $245,154 $393,005 60.3% (10.5)% 70.8% 62.3% 8.5% Service 176,206 259,511 47.3% (11.3)% 58.5% 53.7% 4.9% Total Revenues $421,360 $652,516 54.9% (10.8)% 65.7% 58.7% 7.0% Adjusted EBITDA 87,341 169,042 Adjusted EBITDA Margin 20.7% 25.9% Corporate and Other Business Storage Rental $20,580 $43,481 111.3% 0.0% 111.3% 84.4% 26.9% Service 2,672 16,372 512.7% 0.0% 512.7% 457.1% 55.6% Total Revenues $23,252 $59,853 157.4% 0.0% 157.4% 127.8% 29.6% Adjusted EBITDA (206,427) (223,463) Total(1) Storage Rental $1,837,897 $2,142,905 16.6% (2.1)% 18.7% 16.3% 2.3% Service 1,170,079 1,368,548 17.0% (2.5)% 19.4% 20.0% (0.6)% Total Revenues $3,007,976 $3,511,453 16.7% (2.2)% 19.0% 17.8% 1.2% Adjusted EBITDA 920,005 1,087,288

www.ironmountain.com Selected metric definitions are available in the Appendix Consolidated Balance Sheets 13 S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n I I I S e c t i o n X S e c t i o n I S e c t i o n I I S e c t i o n I V ASSETS 12/31/2015 12/31/2016 Current Assets: Cash and Cash Equivalents $128,381 $236,484 Accounts Receivable, Net 564,401 691,249 Other Current Assets 165,130 184,374 Total Current Assets 857,912 1,112,107 Property, Plant and Equipment: Property, Plant and Equipment 4,744,236 5,535,783 Less: Accumulated Depreciation (2,247,078) (2,452,457) Property, Plant and Equipment, Net 2,497,158 3,083,326 Other Assets, Net: Goodw ill 2,360,978 3,905,021 Other Non-current Assets, Net: 634,539 1,386,346 Total Other Assets, Net 2,995,517 5,291,367 Total Assets $6,350,587 $9,486,800 LIABILITIES AND EQUITY Current Liabilities: Current Portion of Long-term Debt $88,068 $172,975 Other Current Liabilities 753,763 873,582 Total Current Liabilities 841,831 1,046,557 Long-term Debt, Net of Current Portion 4,757,610 6,078,206 Other Long-term Liabilities(1) 222,539 425,366 Total Long-term Liabilities 4,980,149 6,503,572 Total Liabilities $5,821,980 $7,550,129 Equity Total Stockholders' Equity $508,841 $1,936,547 Noncontrolling Interests 19,766 124 Total Equity 528,607 1,936,671 Total Liabilities and Equity $6,350,587 $9,486,800 (1) Includes redeemable noncontrolling interest of $55mm as of December, 31 2016.

www.ironmountain.com Selected metric definitions are available in the Appendix Consolidated Statements of Operations 14 (1) Includes $7.2mm and $12.0mm of Recall Costs in Q4 2016 and full year 2016, respectively. (2) Includes $26.7mm and $21.9mm of Recall Costs in Q4 2015 and Q4 2016, respectively. Also, includes $47.0mm and $120.0mm of Recall Costs in full year 2015 and full year 2016, respectively. S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I S e c t i o n X Q4 2015 Q4 2016 % Change Full Year 2015 Full Year 2016 % Change Revenues: Storage Rental $457,764 $566,547 23.8% $1,837,897 $2,142,905 16.6% Service 294,663 367,646 24.8% 1,170,079 1,368,548 17.0% Total Revenues $752,427 $934,193 24.2% $3,007,976 $3,511,453 16.7% Operating Expenses: Cost of Sales (excluding Depreciation and Amortization)(1) 324,425 416,215 28.3% 1,290,025 1,567,777 21.5% Selling, General and Administrative(2) 216,968 250,545 15.5% 844,960 988,332 17.0% Depreciation and Amortization 85,472 125,430 46.8% 345,464 452,326 30.9% Loss (Gain) on Disposal/Write-Dow n of PP&E (excluding Real Estate), Net 2,293 2,543 10.9% 3,000 1,412 (52.9)% Total Operating Expenses 629,158 794,733 26.3% 2,483,449 3,009,847 21.2% Operating Income (Loss) 123,269 139,460 13.1% 524,527 501,606 (4.4%) Interest Expense, Net 67,751 85,434 26.1% 263,871 310,662 17.7% Foreign Currency Transaction (Gain) / Loss 14,390 5,077 (64.7)% 70,851 20,413 (71.2)% Debt Extinguishment Expense 25,148 0 (100.0)% 27,305 9,283 (66.0)% Other Expense (Income), Net (547) 2,217 n/a 434 14,604 n/a Income (Loss) before Provision (Benefit) for Income Taxes and Gain on Sale of Real Estate 16,527 46,732 n/a 162,066 146,644 (9.5)% Provision (Benefit) for Income Taxes 10,587 (1,213) n/a 37,713 44,944 19.2% Gain on Sale of Real Estate, Net of Tax - (1,855) n/a (850) (2,180) n/a Income (Loss) from Continuing Operations 5,940 49,800 n/a 125,203 103,880 (17.0)% Income (Loss) from Discontinued Operations, Net of Tax - (275) n/a - 3,353 n/a Net Income (Loss) 5,940 49,525 n/a 125,203 107,233 (14.4)% Less: Net Income (Loss) Attributable to Noncontrolling Interests 235 587 n/a 1,962 2,409 22.8% Net Income (Loss) Attributable to Iron Mountain Incorporated $5,705 $48,938 n/a $123,241 $104,824 (14.9)% Earnings (Losses) per Share - Basic: Income (Loss) from Continuing Operations $0.03 $0.19 n/a $0.59 $0.41 (30.5)% Total Income (Loss) from Discontinued Operations - - n/a - $0.01 n/a Net Income (Loss) Attributable to Iron Mountain Incorporated $0.03 $0.19 n/a $0.58 $0.43 (25.9)% Earnings (Losses) per Share - Diluted: Income (Loss) from Continuing Operations $0.03 $0.19 n/a $0.59 $0.41 (30.5)% Total Income (Loss) from Discontinued Operations - $0.00 n/a - $0.01 n/a Net Income (Loss) Attributable to Iron Mountain Incorporated $0.03 $0.19 n/a $0.58 $0.42 (27.6)% Weighted Average Common Shares Outstanding - Basic 211,210 263,528 24.8% 210,764 246,178 16.8% Weighted Average Common Shares Outstanding - Diluted 212,232 264,506 24.6% 212,118 247,267 16.6%

www.ironmountain.com Selected metric definitions are available in the Appendix 15 Reconciliation of Income (Loss) from Continuing Operations to Adjusted EBITDA (1) Net of tax provision of $0.2mm and $0.1mm in full year 2015 and full year 2016, respectively. (2) Includes realized and unrealized FX (gains) losses. S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n X S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I Q4 2015 Q4 2016 % Change Full Year 2015 Full Year 2016 % Change Income (Loss) from Continuing Operations $5,940 $49,800 n/a $125,203 $103,880 (17.0)% Add: Interest Expense, Net 67,751 85,434 26.1% 263,871 310,662 17.7% Provision (Benefit) for Income Taxes 10,587 (1,213) (111.5)% 37,713 44,944 19.2% Gain on Sale of Real Estate, Net of Tax(1) - (1,855) n/a (850) (2,180) n/a Debt Extinguishment Expense 25,148 - (100.0)% 27,305 9,283 (66.0)% Foreign Currency Transaction Losses (Gains)(2) 14,390 5,077 (64.7)% 70,851 20,413 (71.2)% Other Expense (Income), Net (547) 2,217 n/a 434 14,604 n/a Recall Costs 26,690 29,072 8.9% 47,014 131,944 n/a Loss (Gain) on Disposal/Write-Dow n of PP&E (excluding Real Estate), Net 2,293 2,543 10.9% 3,000 1,412 (52.9)% Depreciation and Amortization 85,472 125,430 46.7% 345,464 452,326 30.9% Adjusted EBITDA $237,724 $296,505 24.7% $920,005 $1,087,288 18.2%

www.ironmountain.com Selected metric definitions are available in the Appendix 16 Reconciliation of Reported Earnings per Share to Adjusted Earnings per Share (1) Reflects additional 50.2mm shares of common stock issued in connection with the Recall acquisition in Q2 2016. (2) The difference between our effective tax rate and our structural tax rate (or adjusted effective tax rate) for the three and twelve months ended December 31, 2015 and 2016, respectively, is primarily due to (i) the reconciling items above, which impact our reported income (loss) from continuing operations before provision (benefit) for income taxes but have an insignificant impact on our reported provision (benefit) for income taxes and (ii) other discrete tax items. Our structural tax rate for purposes of the calculation of Adjusted EPS was 16.8% for both the three and twelve months ended December 31, 2015, and 18.5% for both the three and twelve months ended December, 31 2016. S e c t i o n I X S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n X S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I Q4 2015 Q4 2016 % Change Full Year 2015 Full Year 2016 % Change Reported EPS - Fully Diluted from Continuing Operations(1) 0.03$ 0.19$ n/a 0.59$ 0.41$ (30.4)% Add (Deduct): Loss (Gain) on Disposal/Write-Dow n of PP&E (excluding Real Estate), Net 0.01 0.01 n/a 0.01 0.01 n/a Income (Loss) Attributable to Noncontrolling Interests - - n/a - 0.01 n/a Recall Costs 0.13 0.11 (15.5)% 0.22 0.53 n/a Gain on Sale of Real Estate, Net of Tax - (0.01) n/a - (0.01) n/a Other Expense (Income), Net 0.18 0.03 (84.7)% 0.46 0.18 (61.1)% Tax Impact of Reconciling Items and Discrete Tax Items(2) (0.02) (0.06) n/a (0.07) (0.06) (13.2)% Adjusted EPS - Fully Diluted from Continuing Operations 0.33$ 0.26$ (21.2)% 1.21$ 1.07$ (11.6)%

www.ironmountain.com Selected metric definitions are available in the Appendix 17 Reconciliation of Net Income to FFO (Normalized) & AFFO (1) Net of tax provision of $0.2mm and $0.1mm full year 2015 and full year 2016, respectively. (2) Includes realized and unrealized FX (gains) losses. (3) Includes the impact of the repatriation of foreign earnings and accounting method changes related to the REIT conversion (including the impact of amended tax returns); excludes normalized current cash taxes of $8,924 in Q4 2015, $15,694 in Q4 2016, $43,226 full year 2015 and $76,887 full year 2016. (4) Reflects amortization of customer relationship intangible assets, capitalized move costs and amortization of deferred financing costs. (5) Represents actual cash taxes less current tax provision and other one-time cash tax items. (6) Includes $2.8mm of innovation and growth investment for Q4 2016 and $8.6mm for full year 2016. (7) Non-Real Estate Investment CapEx excludes $3.2mm and $9.7mm, of Recall integration CapEx in Q4 2016 and full year 2016, respectively. Real Estate and Non-Real Estate Maintenance CapEx excludes $0.8mm and $1.2mm, of Recall integration CapEx in Q4 2016 and full year 2016, respectively. S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n X S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I Q4 2015 Q4 2016 % Change Full Year 2015 Full Year 2016 % Change Net Income $5,940 $49,525 n/a $125,203 $107,233 (14.4)% Add: Real Estate Depreciation 44,346 61,221 38.1% 178,800 226,258 26.5% Gain on Sale of Real Estate, Net of Tax(1) - (1,855) n/a (850) (2,180) n/a FFO (NAREIT) $50,286 $108,891 n/a $303,153 $331,311 9.3% Add: Loss (Gain) on Disposal/Write-Dow n of PP&E (excluding Real Estate), Net 2,293 2,543 10.9% 3,000 1,412 (52.9)% Foreign Currency Transaction Losses (Gains)(2) 14,390 5,077 (64.7)% 70,851 20,413 (71.2)% Debt Extinguishment Expense 25,148 0 (100.0)% 27,305 9,283 (66.0)% Other Expense (Income), Net (547) 2,217 n/a 434 14,604 n/a Deferred Income Taxes and REIT Tax Adjustments(3) 1,662 (16,908) n/a (5,513) (31,944) n/a Loss (Income) from Discontinued Operations, Net of Tax - 275 n/a - (3,353) n/a Recall Costs 26,690 29,072 8.9% 47,014 131,944 n/a FFO (Normalized) $119,922 $131,169 9.4% $446,244 $473,670 6.1% Add: Non-Real Estate Depreciation 30,376 37,308 22.8% 122,419 139,268 13.8% Amortization Expense(4) 13,555 30,810 n/a 53,494 99,951 86.8% Non-Cash Rent Expense (Income) (380) (1,077) n/a (3,349) (2,086) (37.7)% Stock-based Compensation Expense 6,649 7,106 6.9% 27,585 28,976 5.0% Reconciliation to Normalized Cash Taxes(5) 1,184 6,004 n/a 7,486 33,051 n/a Less: Non-Real Estate Investment(6)(7) 13,008 14,000 7.6% 47,964 41,269 (14.0)% Real Estate and Non-Real Estate Maintenance CapEx(7) 32,068 33,359 4.0% 76,222 83,110 9.0% AFFO $126,229 $163,962 29.9% $529,693 $648,451 22.4% Per Share Amounts (Fully Diluted Shares) FFO (NAREIT) $0.24 $0.41 70.8% $1.43 $1.34 (6.3)% FFO (Normalized) $0.57 $0.50 (12.3)% $2.10 $1.92 (8.9)% Weighted Average Common Shares Outstanding - Basic 211,210 263,528 24.8% 210,764 246,178 16.8% Weighted Average Common Shares Outstanding - Diluted 212,232 264,506 24.6% 212,118 247,267 16.6%

www.ironmountain.com Selected metric definitions are available in the Appendix 18 Reconciliation of Cash Flow from Operations to AFFO (1) Includes actual cash taxes less current tax provision and other one-time cash tax items. (2) In 2016, we revised the reconciliation of AFFO to adjust for normalized cash taxes. We have revised the 2015 reconciliation of AFFO to conform to current year presentation. (3) Working capital adjustments in Q4 2016 are driven primarily by changes in accounts receivables, taxes, accounts payable, employee benefit-related accruals, deferred rent and deferred revenue. (4) Non-Real Estate Investment CapEx excludes $3.2mm and $9.7mm, of Recall integration CapEx in Q4 2016 and full year 2016, respectively. Real Estate and Non-Real Estate Maintenance CapEx excludes $0.8mm and $1.2mm, of Recall integration CapEx in Q4 2016 and full year 2016, respectively. (5) Includes Large Volume Accounts (“LVA”) amortization, impairment of long-term assets and foreign currency adjustments. S e c t i o n I X S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n X S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I Q4 2015 Q4 2016 % Change Full Year 2015 Full Year 2016 % Change Cash Flow from from Operating Activities-Continuing Operations 221,665 122,263 (44.8)% 541,760 541,216 (0.1)% Adjust for: Tax on Gain from Disposition of Real Estate - 95 n/a 209 129 (38.1)% REIT Tax Adjustments(1) (1,181) 33,411 n/a 1,960 18,424 n/a Reconciliation to Normalized Cash Taxes(2) 1,184 6,004 n/a 7,486 33,051 n/a Recall Costs 26,690 29,072 8.9% 47,014 131,944 n/a Working Capital Adjustments(3) (73,627) 21,928 n/a 43,405 60,813 40.1% Non-Cash Rent Expense (380) (1,077) n/a (3,349) (2,086) (37.7%) Non-Real Estate Investment CapEx(4) (13,008) (14,000) 7.6% (47,964) (41,269) (14.0)% Real Estate and Non-Real Estate Maintenance CapEx(4) (32,068) (33,359) 4.0% (76,222) (83,110) 9.0% Other and FX(5) (3,046) (377) (87.6)% 15,394 (10,661) n/a AFFO $126,229 $163,962 29.9% $529,693 $648,450 22.4%

www.ironmountain.com Selected metric definitions are available in the Appendix 19 Revenue Growth Bridge ($mm) 24% Reported R$ 26% C$ Normalized $194 Q4 2016  Revenue  ‐ Reported $ $934 IRM and REC  Revenue  Growth Q4 2015  Revenue  at Q4 2016  FX Rates $740 FX Impact  at Q4 2016  FX Rates $12 Q4 2015  Revenue  ‐ Reported $ $752 S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I $67 $570 FY 2016  Revenue  ‐ Reported $ FY 2015  Revenue  at FY 2016  FX Rates $2,941 $3,511 IRM and REC  Revenue  Growth FY 2015  Revenue  ‐ Reported $ $3,008 FX Impact  at FY 2016  FX Rates 19% C$ Normalized 17% Reported R$ S e c t i o n X Quarterly Full Year

www.ironmountain.com Selected metric definitions are available in the Appendix 20 Quarterly Normalized Adjusted EBITDA Bridge ($mm) 26% C$ Normalized $24 $38 Q4 2016  Adjusted EBITDA  ‐ Reported $ $297 REC and IRM  Adjusted EBITDA  Growth, Net of  Divestitures Recall Gross  Synergies Q4 2015 Adjusted  EBITDA at Q4  2016 FX Rates ‐ Normalized $236 Transformation  Restructuring  Charge $1 FX Impact at Q4  2016 FX Rates $3 Q4 2015  Adjusted EBITDA  ‐ Reported $ $238 25% Reported R$ S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n X S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I

www.ironmountain.com Selected metric definitions are available in the Appendix 21 Full Year Normalized Adjusted EBITDA Bridge ($mm) 20% C$ Normalized $15 $50 $39 $83 FY 2016  Adjusted EBITDA  ‐ Reported $ $1,087 REC and IRM  Adjusted EBITDA  Growth, Net Recall Gross  Synergies Transformation  Benefits FY 2015 Adjusted  EBITDA at FY  2016 FX Rates ‐ Normalized $915 Transformation  Restructuring  Charge $10 FX Impact at FY  2016 FX Rates FY 2015  Adjusted EBITDA  ‐ Reported $ $920 18% Reported R$ S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n X S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I (1) (1) Net of divestitures and impact of year-over-year decline in service gross margin.

www.ironmountain.com Selected metric definitions are available in the Appendix 22 Normalized Adjusted EPS Bridge Normalized Comparison Q4 2015  Adjusted EPS $0.33 Q4 2015 Adjusted  EPS ‐ Normalized $0.06 Impact of Higher  Share Count $0.26 Recall Gross  Synergies and  Business Growth $0.26 $0.18 Tax Rate IncreaseIncrease in  Interest Expense  and D&A Q4 2016 Adjusted  EPS ‐ Reported $ $0.01 $0.19 $(0.06) Reported S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n X S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I $1.07 $0.52$0.57 $0.05 Tax Rate Increase FY 2016 Adjusted  EPS ‐ Reported $ Transformation  Benefits Recall  Gross Synergies  and Business  Growth FY 2015 Adjusted  EPS ‐ Normalized $1.07 Transformation  Restructuring  Charge Increase in  Interest Expense  and D&A Impact of Higher  Share Count $0.03$0.17 $1.21 FY 2015  Adjusted EPS $(0.14) Reported Normalized Comparison Quarterly Full Year

www.ironmountain.com Selected metric definitions are available in the Appendix 23 Storage and Service Reconciliation S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n X S e c t i o n I I I S e c t i o n I I S e c t i o n I S e c t i o n V S e c t i o n I V Q4 2015 Q4 2016 % Change Full Year 2015 Full Year 2016 % Change Total Storage Revenue $457,764 $566,547 23.8% $1,837,897 $2,142,905 16.6% Add: Permanent w ithdraw al fees 6,280 5,682 (9.5%) 26,030 21,784 (16.3%) Adjusted Storage Revenue $464,044 $572,229 23.3% $1,863,927 $2,164,689 16.1% Total Service Revenue $294,663 $367,646 24.8% $1,170,079 $1,368,548 17.0% Less: Permanent w ithdraw al fees (6,280) (5,682) (9.5%) (26,030) (21,784) (16.3%) Adjusted Service Revenue $288,383 $361,964 25.5% $1,144,049 $1,346,764 17.7% Storage Cost of Sales (COS) Storage COS excluding rent 62,082 71,131 14.6% 233,807 274,913 17.6% Storage Rent 47,800 70,938 48.4% 197,101 262,327 33.1% Total Storage COS 109,882 142,069 29.3% 430,908 537,240 24.7% Service Cost of Sales (COS) Service COS excluding rent 211,363 264,158 25.0% 850,204 1,005,863 18.3% Service Rent 3,181 2,814 (11.5%) 8,914 12,709 42.6% Total Service COS 214,544 266,971 24.4% 859,118 1,018,572 18.6% Recall Cost of Sales Expenses - 7,175 n/a - 11,963 n/a Total COS $324,426 $416,215 28.3% $1,290,026 $1,567,777 21.5% SG&A Costs Storage Overhead 26,586 32,483 22.2% 133,965 130,201 (2.8%) Service Overhead 19,631 23,161 18.0% 96,418 92,115 (4.5%) Corporate Overhead 90,991 110,158 21.1% 353,534 407,859 15.4% Recall Costs Included in SG&A 26,690 21,897 (18.0%) 47,014 119,981 n/a Sales and Marketing 53,070 62,846 18.4% 214,029 238,177 11.3% Total SG&A $216,968 $250,545 15.5% $844,960 $988,332 17.0% Adjusted EBITDA Total Storage Adjusted EBITDA 327,576 397,678 21.4% 1,299,054 1,497,248 15.3% Total Service Adjusted EBITDA 54,209 71,831 32.5% 188,514 236,077 25.2% Less: Corporate Overhead and Sales and Marketing (144,060) (173,004) 20.1% (567,563) (646,036) 13.8% Total Adjusted EBITDA $237,724 $296,505 24.7% $920,005 $1,087,288 18.2%

www.ironmountain.com Selected metric definitions are available in the Appendix 24 Storage Net Operating Income (NOI) (1) Includes Data Center, Fine Art Storage, Consumer Storage, Technology Escrow Services, Digital Storage, Fulfillment Services, Information Governance and Digital Solutions, Entertainment Services and other ancillary storage revenues. (2) Includes Rent Expense, Building Maintenance, Property Taxes, Utilities and Insurance costs. (3) Full year 2015 Storage Rental Labor Costs reflect true-ups of accruals for incentive compensation and workers compensation claims. (4) Refer to page 23 and Appendix for overhead allocations and definitions. S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I S e c t i o n X Q4 2015 Q4 2016 % Change Full Year 2015 Full Year 2016 % Change Revenue from Storage Rental Activities Records Management $358,253 $447,371 24.9% $1,447,179 $1,686,805 16.6% Data Protection 74,350 85,845 15.5% 298,963 329,585 10.2% Other(1) 25,161 33,330 32.5% 91,755 126,516 37.9% Total Storage Rental $457,764 $566,547 23.8% $1,837,897 $2,142,905 16.6% Terminations/Permanent Withdraw al Fees 6,280 5,682 (9.5)% 26,030 21,784 (16.3)% Total Revenue from Adjusted Storage Rental Activities $464,044 $572,229 23.3% $1,863,927 $2,164,689 16.1% Less: Storage Rental Expenses Facility Costs(2) 98,404 131,529 33.7% 402,691 492,686 22.3% Storage Rental Labor(3) 5,191 3,320 (36.1)% 7,790 15,472 98.6% Other Storage Rental Expenses 6,286 7,220 14.9% 20,427 29,083 42.4% Storage Cost of Sales 109,882 142,069 29.3% 430,908 537,240 24.7% Allocated Overhead(4) 26,586 32,483 22.2% 133,965 130,201 (2.8)% Total Storage Rental Expenses 136,468 174,551 27.9% 564,873 667,441 18.2% Total Storage Adjusted EBITDA $327,576 $397,678 21.4% $1,299,054 $1,497,248 15.3% Total Storage Adjusted EBITDA Margin 70.6% 69.5% -110 bps 69.7% 69.2% -50 bps Storage Rent 47,800 70,938 48.4% 197,101 262,327 33.1% Storage Net Operating Income $375,376 $468,616 24.8% $1,496,155 $1,759,575 17.6% Storage Net Operating Income Margin 80.9% 81.9% 100 bps 80.3% 81.3% 100 bps

www.ironmountain.com Selected metric definitions are available in the Appendix Service Business Detail 25 (1) Includes Fulfillment Services, Information Governance and Digital Solutions, Technology Escrow Services, Data Center, Consulting, Entertainment Services, Fine Art Storage, Consumer Storage and other ancillary services. (2) Includes Building Maintenance, Property Taxes, Utilities, Facility Rent and Insurance costs for shredding, imaging and other services. (3) Refer to page 23 and Appendix for overhead allocations and definitions. S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I S e c t i o n X Q4 2015 Q4 2016 % Change Full Year 2015 Full Year 2016 % Change Service Operations Revenue by Product Line Records Management $148,835 $166,056 11.6% $597,348 $645,427 8.0% Data Protection 40,606 42,882 5.6% 170,183 170,969 0.5% Shredding 59,536 89,524 50.4% 238,030 322,559 35.5% Other(1) 45,686 69,184 51.4% 164,518 229,593 39.6% Total Service Revenue $294,663 $367,646 24.8% $1,170,079 $1,368,548 17.0% Less: Terminations/Permanent Withdraw al Fees 6,280 5,682 (9.5)% 26,030 21,784 (16.3)% Adjusted Service Revenue $288,384 $361,964 25.5% $1,144,049 $1,346,764 17.7% Less: Service Expenses Facility Costs(2) 7,645 7,519 (1.7)% 23,191 30,010 29.4% Service Labor 157,502 192,150 22.0% 639,292 741,053 15.9% Other Service Expenses 49,397 67,303 36.2% 196,635 247,509 25.9% Service Cost of Sales 214,544 266,971 24.4% 859,118 1,018,572 18.6% Allocated Overhead(3) 19,631 23,161 18.0% 96,418 92,115 (4.5)% Total Service Expenses 234,175 290,133 23.9% 955,536 1,110,687 16.2% Total Service Adjusted EBITDA $54,209 $71,831 32.5% $188,514 $236,077 25.2% Total Service Adjusted EBITDA Margin 18.8% 19.8% 100 bps 16.5% 17.5% 110 bps Service Rent 3,181 2,814 (11.5)% 8,914 12,709 42.6% Total Service Adjusted EBITDAR $57,389 $74,645 30.1% $197,427 $248,785 26.0% Total Service Adjusted EBITDAR Margin 19.9% 20.6% 70 bps 17.3% 18.5% 120 bps

www.ironmountain.com Selected metric definitions are available in the Appendix Gross Book Value of Real Estate Assets 26 (1) Includes warehouse equipment, vehicles, furniture, fixtures, computer hardware and software. To be  updated S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n X S e c t i o n V I S e c t i o n V S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n IReal Estate Assets Storage Operations Land $253,002 Buildings & Building Improvements 1,668,603 Leasehold Improvements 492,676 Racking 1,729,572 Construction In Progress 44,919 Total Storage Gross Book Value $4,188,773 Service Operations Land $7,057 Buildings & Building Improvements 33,844 Leasehold Improvements 45,692 Racking 146,199 Construction In Progress 3,304 Total Service Gross Book Value $236,096 Total Real Estate Gross Book Value $4,424,869 Non-Real Estate Assets All Other Non-Real Estate Assets Gross Book Value(1) 1,110,914 Total PP&E Gross Book Value $5,535,783 As of 12/31/2016

www.ironmountain.com Selected metric definitions are available in the Appendix Lease Obligations(1) (1) Includes capital and operating lease obligations (2) Reflects month to month leases and predominantly short term occupancies Weighted Average Remaining Lease Obligations (no exercise of extension options): 6.1 years Weighted Average Remaining Lease Obligations (exercise of all extension options): 12.0 years 2026 56.5% 2027 Thereafter 5.2% 2022 2024 2025 4.7% 3.7% 3.3%3.2% 2023 3.2% 2021 2.8% 2020 3.0% 2019 3.0% 2018 4.3% 2017 7.0% Facility Lease Expirations (% of total square feet subject to lease) Assuming Exercise of All Extension Options 27 S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n X S e c t i o n V I S e c t i o n V S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I (2)

www.ironmountain.com Selected metric definitions are available in the Appendix Global Real Estate Portfolio(1) 28 (1) Includes real estate held in joint ventures. (2) Adjustments to previous periods due to refinements to real estate basis and reclassification of multiple adjoining facilities into single buildings. (3) Includes South Africa. (4) Out of the 32 leased building additions and expansions, 16 were the result of acquiring leases in business acquisitions and leased buildings related to acquisitions of customer relationships. (000s, except for number of buildings) S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I S e c t i o n X Total Buildings Sq. Ft. Buildings Sq. Ft. Buildings Sq. Ft. North America 200 21,715 581 35,636 781 57,351 Europe(3) 60 3,565 304 12,164 364 15,729 Latin America 36 1,914 93 4,813 129 6,728 Asia Pacif ic 8 465 207 8,420 215 8,884 International x 104 5,944 604 25,397 708 31,341 Total 304 27,658 1,185 61,034 1,489 88,692 Total Buildings Sq. Ft. Buildings Sq. Ft. Buildings Sq. Ft. North America 1 34 3 175 4 209 Europe(3) - - 11 266 11 266 Latin America - - 1 65 1 65 Asia Pacif ic 2 34 17 634 19 668 International x 2 34 29 965 31 999 Total 3 67 32 1,140 35 1,208 Total Buildings Sq. Ft. Buildings Sq. Ft. Buildings Sq. Ft. North America (5) (389) (28) (1,070) (33) (1,460) Europe(3) (2) (36) (17) (375) (19) (411) Latin America - - (2) (191) (2) (191) Asia Pacif ic (3) (64) (24) (1,579) (27) (1,643) International x (5) (100) (43) (2,144) (48) (2,245) Total (10) (489) (71) (3,215) (81) (3,704) Total Buildings Sq. Ft. Buildings Sq. Ft. Buildings Sq. Ft. North America 196 21,359 556 34,741 752 56,101 Europe(3) 58 3,529 298 12,055 356 15,584 Latin America 36 1,914 92 4,687 128 6,602 Asia Pacif ic 7 434 200 7,476 207 7,910 International x 101 5,877 590 24,218 691 30,095 Total 297 27,237 1,146 58,959 1,443 86,196 Total % 20.6% 31.6% 79.4% 68.4% As of 9/30/2016 Adjusted(2) Q4 2016 Additions & Expansions Q4 2016 Dispositions & Move Outs As of 12/31/2016 Owned Facilities Leased Facilities Leased Facilities Leased Facilities(4) Owned Facilities Owned Facilities Owned Facilities Leased Facilities Top Ten Markets Owned, United States Sq. Feet Owned Northern New Jersey 2,099 Boston 1,428 Chicago 1,282 Dallas 1,075 Los Angeles 1,012 Houston 917 New York 825 Baltimore / Washington 777 San Francisco Bay Area 770 Philadelphia 676 Top Ten Markets Owned, International Sq. Feet Owned London, UK 1,102 Paris, France 807 Montreal, Canada 552 Buenos Aires, Argentina 470 Mexico City, Mexico 452 Toronto, Canada 414 Lima, Peru 302 Edinburgh, UK 289 Singapore, Singapore 274 Calgary, Canada 270

www.ironmountain.com Selected metric definitions are available in the Appendix Revenue from Rental Activities and Storage NOI per Racked Square Foot 29 (1) Includes loading docks, unracked space, office space, common areas, as well as space in service-related facilities. (2) Excludes Revenue and NOI associated with Technology Escrow Services, Fulfillment Services, Data Center, Entertainment Services, Fine Art Storage, Consumer Storage and other ancillary storage revenue. (3) Includes South Africa. Annualized Revenue from Rental Activities and Storage NOI per Racked Square Foot(2) S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n X S e c t i o n V I S e c t i o n V S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n ISquare Footage by Region As of December 31, 2016 North America Europe Latin America Asia Pacific Total Records Management Racked Space 41,056 11,342 4,976 4,590 61,964 Data Protection Racked Space 713 121 32 18 885 Other(1) 14,331 4,121 1,594 3,301 23,347 Total 56,101 15,584 6,602 7,910 86,196 Q4 2016 Annualized Revenue NOI North America Records Management $ per Sq Ft $28.20 $23.14 Data Protection $ per Sq Ft $359.09 $325.32 Europe(3) $33.37 $27.99 Latin America $34.46 $29.79 Asia Pacific $40.46 $34.89 Total $33.94 $28.48

www.ironmountain.com Selected metric definitions are available in the Appendix Portfolio Utilization Records Management Storage Portfolio (CuFt MM) As of 12/31/2016 2144 92 5466 131 700 600 500 400 100 0 +49.8% Total IRM +24.4% +10.1% +42.5% +152.5% 676 543 Asia PacificLatin AmericaEuropeNorth America 425 386 600 800 700 500 100 0 72 85%92% Europe 6456 86% 97% Latin America 76 Total IRM 792 736 85% 92% Asia Pacific 157144 84%91% North America 495 464 86%91% Capacity and Utilization(3) (%) 1 6 10 2 6 12 90 80 70 60 20 10 0 +27.7% +5.9% +4.8% +15.3% +3.8% Total IRM 83 Latin AmericaEurope Asia Pacific 79 North America 6461 120 110 100 90 0 10 20 80 71% 82% Asia Pacific 32 54% 85 56% 16 22 77 75% 84% 83% 84% 7 North America 75% Europe 7 Latin America 82% Total IRM 117 102 Data Protection Storage Portfolio (DPUs MM) As of 12/31/2016 (IRM Standalone) (2) (1) RM units stored includes cubic feet of storage in dedicated space leased to customers on a square foot basis; these dedicated space storage units are excluded from our RM volume growth chart on page 10. (2) DPUs do not reflect data for Recall, because Recall’s unit of measurement for tapes is not consistent with Iron Mountain’s methodology. We are in the process of converting Recall’s data to be able to report DPUs. (3) We operate our storage business to achieve a desired utilization of between 94% – 98% to attain maximum operating efficiency. (4) Includes South Africa. 30 YoY Growth in Units Stored(1) (4) (4) (4) (4) S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n X S e c t i o n V I S e c t i o n V S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I Q4 2016Q3 2016Q2 2016Q1 2016Q4 2015 Q4 2016 Total Installed Racking Cap. Q4 2016 Total Potential Building Cap.

www.ironmountain.com Selected metric definitions are available in the Appendix Customer Data 31 (1) No single vertical within ‘Other’ comprises greater than 1% of North America Revenue. (2) Customer acquisition costs include the acquisition of customer relationships and customer inducements such as move costs and permanent withdrawal fees. Federal Healthcare Financial Legal Insurance Life Sciences Energy Business Services 41% Other 18% 2% 10% 15% 8% 3%3% 2% North America Q4 2016 Trailing Twelve Months Revenue by Vertical Iron Mountain provides storage and information management services to more than 230,000 customers in 45 countries around the world. This high quality, diversified customer base comprising numerous industries and government organizations includes approximately 95% of the Fortune 1000. No single customer represents more than 1% of revenues, or 2% of volume, and our top 20 customers have historically represented approximately 6% of consolidated revenues. Customer retention is consistently high with annual losses limited to roughly 2% (on a volume basis), attributable to customer terminations. (1) S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n X S e c t i o n V I S e c t i o n V S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I Full Year 2016 Full Year 2015 Full Year 2014 Full Year 2013 Customer Quality Metrics Volume Retention Rate (RM Global) 92.6% 93.3% 93.7% 92.9% Bad Debt Expense as a % of Consolidated Revenues 0.2% 0.5% 0.5% 0.4% Turnover Expenditures (Storage Only) Q4 2016 Full Year 2016 Sales, Marketing & Account Management 38,113 145,350 Customer Acquisition Costs(2) 9,911 50,766

www.ironmountain.com Selected metric definitions are available in the Appendix Debt Schedule 32 $179 $494 Thereafter2026 $300 20252024 $1,000 2023 $786 2022 $673 2021 $649 2020 $1,016 2019 $1,188 2018 $247 2017 28% 72% Fixed vs. Floating Rate Debt at 12/31/16(4) Debt Maturity Schedule ($MM) Floating Rate Debt Fixed Rate Debt (1) (1) Accounts Receivable securitization. (2) Option to extend revolving credit facility to 2020, subject to conditions specified in our credit agreement. (3) Includes $16mm and $50mm of mortgage notes payable in 2020 and 2026, respectively. (4) Adjusting to include capital-lease and other international borrowings yields a ratio of 73% fixed and 27% floating. (2) Floating Rate Debt at 12/31/16 Fixed Rate Debt at 12/31/16 S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I S e c t i o n X (3) (3)

www.ironmountain.com Selected metric definitions are available in the Appendix Capitalization 33 (1) Total debt net of cash is calculated as current portion of long-term debt of $173mm plus long-term debt net of current portion of $6,078mm plus $68mm of deferred financing costs less cash and cash equivalents of $236mm. Net Lease Adjusted Leverage Ratio6.5 5.5 0.0 5.7x 12/31/201612/31/2015 5.6x 12/31/2014 5.4x S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I S e c t i o n X Senior Unsecured and Senior Subordinated Notes (as of 12/31/2016) Senior Senior Senior Senior Senior Senior Senior Senior Type of Note Unsecured Unsecured Subordinated Unsecured Unsecured Unsecured Unsecured Unsecured Issuance Date 8/13/13 8/13/13 8/7/12 9/18/14 9/29/15 5/27/16 5/27/16 9/15/16 Denomination CAD USD USD GBP USD USD USD CAD Original Principal Amount (FX Rate on Issue Date) $193,720 $600,000 $1,000,000 $654,960 $1,000,000 $500,000 $250,000 $189,537 Exchange Rate at 12/31/2016 0.7440 1.0000 1.0000 1.2341 1.0000 1.0000 1.0000 0.7440 Principal Amount at 12/31/2016 $148,792 $600,000 $1,000,000 $493,648 $1,000,000 $500,000 $250,000 $185,990 Yield (on Issue Date) 6.125% 6.000% 5.750% 6.125% 6.000% 4.375% 5.375% 5.375% Maturity Date 8/15/21 8/15/23 8/15/24 9/15/22 10/1/20 6/1/21 6/1/26 9/15/23 Current Call Price N/A N/A N/A N/A N/A N/A N/A N/A Next Call Date 8/15/17 10/15/18 8/15/17 9/15/17 10/1/17 6/1/18 6/1/21 9/15/19 Next Call Price 103.063 103.000 102.875 104.594 103.000 102.188 102.688 104.031 Senior Credit Facility Debt Covenant Analysis (as of 12/31/2016) Metric Limit Current Fixed Charge Ratio ≥ 1.5x 2.4x Net Total Lease Adjusted Leverage Ratio ≤ 6.5x 5.7x Net Secured Lease Adjusted Leverage Ratio ≤ 4.0x 2.7x Senior Credit Facility (as of 12/31/2016) Capacity $1,984,375 Outstanding $1,187,923 Letters of Credit $54,957 Remaining Capacity $741,495 Interest Rate Spread (Prime) 1.25% Interest Rate Spread (LIBOR) 2.25% Weighted Average Interest Rate 2.88% Maturity Date 7/5/19

www.ironmountain.com Selected metric definitions are available in the Appendix Capital Expenditures and Investments 34 (1) Includes Recall CapEx of $10.0mm in Q4 2016 and $18.3 full year 2016. (2) Includes $10.9mm and $70.7mm for data centers in Q4 2016 and full year 2016, respectively. (3) Includes Land, Buildings, Improvements, and Racking Structures. (4) Includes $2.8mm of innovation and growth investment in Q4 2016 and $8.6mm full year 2016. (5) Excludes amount related to Recall. (6) Excludes accrual adjustments and customer inducements. S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I S e c t i o n X Q4 2015 Q4 2016 % Change Full Year 2015 Full Year 2016 % Change Capital Expenditures(1) and Investments Real Estate: Investment(2)(3) $65,211 $46,505 (28.7)% $170,742 $203,778 19.3% Maintenance 24,715 27,932 13.0% 52,826 63,543 20.3% $89,926 $74,437 (17.2)% $223,568 $267,321 19.6% Non-Real Estate: Investment(4) $13,008 $17,199 32.2% $47,964 $50,954 6.2% Maintenance 7,353 6,207 (15.6)% 23,396 20,799 (11.1)% $20,361 $23,406 15.0% $71,360 $71,753 0.6% Total Real Estate and Non-Real Estate Capital Expenditures and Investments $110,287 $97,843 (11.3%) $294,928 $339,074 15.0% Net Change in Prepaid and Accrued Capital Expenditures (22,619) (15,269) (32.5%) (4,679) (10,471) n/a Total Cash Paid for Real Estate and Non-Real Estate Capital Expenditures and Investments 87,668 82,574 (5.8%) 290,249 328,603 13.2% Business and Customer Acquisitions Business Acquisitions(5) $92,039 18,427 (80.0)% $119,856 48,678 (59.4)% Change in Business Acquisition Accruals and Cash Acquired(5) (6,456) (2,765) (6,298) (11,502) Cash Paid for Acquisitions, Net of Cash Acquired, Excluding Recall 85,583 15,662 (81.7)% 113,558 37,176 (67.3)% Recall Acquisition Non-Cash Consideration - - n/a - $1,835,027 n/a Recall Acquisition Cash - (68) n/a - 254,789 n/a Total Recall Acquisition - (68) n/a - $2,089,816 n/a Total Cash Paid for Acquisitions, Net of Cash Acquired $85,583 $15,594 (81.8)% $113,558 $291,965 n/a Acquisition of Customer Relationships $17,272 3,769 (78.2)% $38,163 $28,982 (24.1)% Customer Inducements 7,545 3,106 (58.8)% 22,500 19,205 (14.6)% Total Acquisition of Customer Relationships and Customer Inducements $24,817 $6,875 (72.3)% $60,663 $48,187 (20.6)% Change in Customer Acquisition Accruals (4,869) 3,036 n/a (5,552) 2,579 n/a Total Cash Paid for Acquisition of Customer Relationships and Customer Inducements 19,948 9,911 (50.3)% 55,111 50,766 (7.9)% Total Capital Expenditures, Investments and Acquisitions(6) $219,598 $119,971 (45.4)% $452,947 $2,506,550 n/a

www.ironmountain.com Selected metric definitions are available in the Appendix Investments(1) 35 (1) Based on 2016 C$ Budgeted FX Rates. (2) Racking Installations exclude consolidation spend in Total Expected Investment, Investment in Current Period and Cumulative Investment to Date of $39.7mm, $1.2mm and $38.9mm, respectively. (3) In USD R$. Q4 2016 has been normalized to reflect the Recall benefit and is calculated using a twelve month trailing historical average. (4) Building Development Projects exclude consolidation spend in Total Expected Investment, Investment in Current Period and Cumulative Investment to Date of $1.0mm, $0.3mm and $0.3mm, respectively. (5) North America excludes racking investments for development projects that were initiated after 1/1/2016. (6) Includes a large Building Development Project, with a longer than average stabilization period. (7) Excludes acquisition of Recall. S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I S e c t i o n X 2016 Business and Customer Acquisition and Disposition Activity Investment Reconciliation Q4 Investments Racking Installations $20,956 Consolidation Related to Racking Installations 1,195 Building Development Projects 5,323 Total C$ Real Estate Investments 27,780 Data Centers 10,906 Other Real Estate Investment 8,545 Total FX Impact (726) Real Estate Investment $46,505 Business Business Investments( 7) Dispositions Purchase Price $77,660 ($135,000) Capital Consideration $32,729 - Stabilized Total Expected Investment $110,388 ($135,000) Estimated Annual Revenues $38,578 - Expected IRR Range 10% - 14% - Real Estate Investment Activity Total Expected Investment in Estimated Historical Average Investment Current Period CuFt / DPUs NOI/CuFt or DPU(3) Racking Installations(2) North America $26,177 $7,248 $18,801 8,978 $2.00 Europe 32,752 7,018 22,821 7,692 $1.73 Latin America 17,657 3,354 7,757 4,437 $1.51 Asia Pacif ic 14,941 3,336 8,467 4,218 $1.13 Worldwide $91,527 $20,956 $57,846 25,325 $1.83 8 - 12 months Total Expected Investment in Total Potential Historical Average Investment Current Period CuFt / DPUs NOI/CuFt or DPU(3) Building Development Projects(4) North America(5) $16,550 $5,323 $12,866 - 119 $2.00 Europe 3,002 - 2,791 368 22 $1.73 Latin America(6) 17,589 - 8,879 5,131 196 $1.51 Asia Pacif ic - - - - - $1.13 Worldwide $37,141 $5,323 $24,536 5,499 336 $1.83 24 - 36 months Purchase Expected Net Price IRRs Proceeds 2016 Building Acquisitions 2016 Building Sales not Associated with Recall Dispositions North America $28,661 510 8%-11% North America 7,905 329 Europe - - - Europe - - Latin America - - - Latin America - - Asia Pacif ic - - - Asia Pacif ic - - Worldwide $28,661 510 8%-11% Worldwide 7,905 329 Region Investment to Date Region Total Sq Ft Average Stabilization Period Total Sq Ft Average Stabilization Period Investment to Date Region RegionTotal Sq Ft

www.ironmountain.com Selected metric definitions are available in the Appendix Components of Value 36 (1) Includes South Africa. (2) Trailing four quarter prior to rental expense. (3) Annualization of four months of Recall Service EBITDAR. (4) Includes Cash, Cash Equivalents, Restricted Cash, Accounts Receivable, Other Tangible Current Assets and Prepaid Expenses. (5) Calculated as current portion of Long-Term Debt of $173mm plus Long-Term Debt net of current portion of $6,078mm. S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I S e c t i o n X Components Q4 Annualized NOI North America Records Management $950,011 Data Protection 232,019 Other 70,671 Europe(1) 320,424 Latin America 144,114 Asia Pacific 157,225 Total Storge NOI $1,874,465 Service Adjusted EBITDAR(2) $248,809 Annualized Recall Service Adjusted EBITDAR not included above(3) 24,216 Total Service Adjusted EBITDAR $273,025 Balance at 12/31/2016 Cahs, Cash Equivalents & Other Tangible Assets(4) $1,112,107 Quarterly Building & Racking Investment, not reflected in NOI $26,279 Customer Acquisition Consideration $3,769 Less: Debt, Gross Book Value(5) $6,251,181 Non-Controlling Interests $124 Annualized Rental Expense $295,009 Estimated Tax Liability $34,563 Q4 Service Adjusted EBITDAR

www.ironmountain.com Selected metric definitions are available in the Appendix Appendix 37 Q3 2016 and Q3 YTD 2016 Internal Growth During the fourth quarter of 2016, we determined that our internal revenue growth rates for the three and nine months ended September 30, 2016 were incorrectly calculated in our Other International Business segment. Approximately $4.4 million of revenue associated with the Recall Transaction was attributed to our business as it existed prior to the Recall Transaction. This incorrect calculation impacted our previously reported internal revenue growth rates for our Other International Business segment as well as our consolidated internal revenue growth rates. The corrected internal storage rental revenue, internal service revenue and internal total revenue growth rates for our Other International Business segment were 7.5%, 1.6% and 5.0%, respectively, for the three months ended September 30, 2016 and 8.5%, 5.9% and 7.4%, respectively, for the nine months ended September 30, 2016. Our corrected consolidated internal storage rental revenue, internal service revenue and internal total revenue growth rates were 2.1%, (1.3)% and 0.8%, respectively, for the three months ended September 30, 2016 and 2.1%, (0.5)% and 1.1%, respectively, for the nine months ended September 30, 2016. S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I S e c t i o n X

www.ironmountain.com Selected metric definitions are available in the Appendix 38 Reconciliation of Net Income to FFO (Normalized) & AFFO New Definition (1) Net of tax provision of $0.2mm and $0.1mm full year 2015 and full year 2016, respectively. (2) Includes realized and unrealized FX (gains) losses. (3) Represents actual cash taxes less current tax provision and other one-time cash tax items. (4) Non-Real Estate Investment excludes innovation and growth investment of $8.6mm and Recall Non-Real Estate Investment CapEx of $9.7mm. (5) Maintenance CapEx excludes Recall Maintenance CapEx of $1.2mm. S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n I I I S e c t i o n I I S e c t i o n I S e c t i o n I V S e c t i o n X Full Year 2015 Full Year 2016 % Change Net Income $125,203 $107,233 (14.4)% Add: Real Estate Depreciation 178,800 226,258 26.5% Gain on Sale of Real Estate, Net of Tax(1) (850) (2,180) n/a FFO (NAREIT) $303,153 $331,311 9.3% Add: Loss (Gain) on Disposal/Write-Dow n of PP&E (excluding Real Estate), Net 3,000 1,412 (52.9)% Foreign Currency Transaction Losses (Gains)(2) 70,851 20,413 (71.2)% Debt Extinguishment Expense 27,305 9,283 (66.0)% Other Expense (Income), Net 434 14,604 n/a Tax Impact of Reconciling Items and Discrete Tax Items (14,480) (15,019) 3.7% Loss (Income) from Discontinued Operations, Net of Tax - (3,353) n/a Recall Costs 47,014 131,944 n/a FFO (Normalized) $437,277 $490,595 12.2% Add: Non-Real Estate Depreciation 122,419 139,268 13.8% Amortization of Customer Relationship Intangible Assets 44,245 86,800 96.2% Amortization of Deferred Financing Costs 9,249 13,151 42.2% Revenue Reduction Associated w ith Amortization of Permanent Withdraw al Fees 11,670 12,217 4.7% Non-Cash Rent Expense (Income) (3,349) (2,086) (37.7)% Stock-based Compensation Expense 27,585 28,976 5.0% Reconciliation to Normalized Cash Taxes(3) 16,453 16,127 n/a Less: Non-Real Estate Investment(4) 47,964 32,696 (31.8)% Real Estate and Non-Real Estate Maintenance CapEx(5) 76,222 83,110 9.0% AFFO $541,363 $669,240 23.6% Per Share Amounts (Fully Diluted Shares) FFO (NAREIT) $1.43 $1.34 (6.3)% FFO (Normalized) $2.06 $1.98 (3.8)% Weighted Average Common Shares Outstanding - Basic 210,764 246,178 16.8% Weighted Average Common Shares Outstanding - Diluted 212,118 247,267 16.6%

www.ironmountain.com Selected metric definitions are available in the Appendix Appendix 39 Non-GAAP Measures Non-GAAP measures are supplemental metrics designed to enhance our disclosure and to provide additional information that we believe to be important for investors to consider when evaluating our financial performance. These non-GAAP measures should be considered in addition to, but not as a substitute for, other measures of financial performance reported in accordance with accounting principles generally accepted in the Unites States of America (“GAAP”), such as operating income, income (loss) from continuing operations, net income (loss) or cash flows from operating activities from continuing operations (as determined in accordance with GAAP). Adjusted Earnings Per Share, or Adjusted EPS Adjusted EPS is defined as reported earnings per share fully diluted from continuing operations excluding: (1) (gain) loss on disposal/write-down of property, plant and equipment (excluding real estate), net; (2) gain on sale of real estate, net of tax; (3) intangible impairments; (4) other expense (income), net; (5) Recall Costs; (6) REIT Costs; and (7) the tax impact of reconciling items and discrete tax items. Adjusted EPS includes income (loss) attributable to noncontrolling interests. We do not believe these excluded items to be indicative of our ongoing operating results, and they are not considered when we are forecasting our future results. We believe Adjusted EPS is of value to our current and potential investors when comparing our results from past, present and future periods. Adjusted Funds From Operations, or AFFO AFFO is defined as FFO (Normalized) excluding non-cash rent expense or income, plus depreciation on non-real estate assets, amortization expense of customer relationship intangible assets and deferred financing costs, stock-based compensation expense and the impact of reconciling to normalized cash taxes, less maintenance capital expenditures and non-real estate investments, excluding Recall integration capital expenditures. We believe AFFO is a useful measure in determining our ability to generate excess cash that may be used for reinvestment in the business, discretionary deployment in investments such as real estate or acquisition opportunities, returning capital to our stockholders and voluntary prepayments of indebtedness. Additionally AFFO is reconciled to cash flow from operations to adjust for real estate and REIT tax adjustments, REIT costs, Recall costs, working capital adjustments and other non-cash expenses. AFFO does not include adjustments for customer inducements, acquisition of customer relationships and investment in innovation as we consider these costs to be growth related. Adjusted Funds From Operations, or AFFO – New Definition AFFO is defined as FFO (Normalized) excluding non-cash rent expense or income, plus depreciation on non-real estate assets, amortization expense of customer relationship intangible assets, deferred financing costs and permanent withdrawal fees, stock-based compensation expense and the impact of reconciling to normalized cash taxes, less maintenance capital expenditures and non-real estate investments, excluding Recall integration capital expenditures. We believe AFFO is a useful measure in determining our ability to generate excess cash that may be used for reinvestment in the business, discretionary deployment in investments such as real estate or acquisition opportunities, returning capital to our stockholders and voluntary prepayments of indebtedness. Additionally AFFO is reconciled to cash flow from operations to adjust for real estate and REIT tax adjustments, REIT costs, Recall costs, working capital adjustments and other non-cash expenses. AFFO does not include adjustments for customer inducements, acquisition of customer relationships and investment in innovation as we consider these costs to be growth related. S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I S e c t i o n X

www.ironmountain.com Selected metric definitions are available in the Appendix Appendix Non-GAAP Measures (continued) Adjusted EBITDA and Adjusted EBITDA Margin Adjusted EBITDA is defined as income (loss) from continuing operations before interest expense, net, provision (benefit) for income taxes, depreciation and amortization, and also excludes certain items that we believe are not indicative of our core operating results, specifically: (i) loss (gain) on disposal/write-down of property, plant and equipment (excluding real estate), net; (ii) intangible impairments; (iii) other expense (income), net; (iv) gain on sale of real estate, net of tax; (v) Recall Costs; and (vi) REIT Costs. Adjusted EBITDA margin is calculated by dividing Adjusted EBITDA by Total Revenues. We use multiples of current or projected Adjusted EBITDA in conjunction with our discounted cash flow models to determine our overall enterprise valuation and to evaluate acquisition targets. We believe Adjusted EBITDA and Adjusted EBITDA Margin provide our current and potential investors with relevant and useful information regarding our ability to generate cash flow to support business investment. These measures are an integral part of the internal reporting system we use to assess and evaluate the operating performance of our business. Adjusted EBITDA excludes both interest expense, net and the provision (benefit) for income taxes. These expenses are associated with our capitalization and tax structures, which we do not consider when evaluating the operating profitability of our core operations. Finally, Adjusted EBITDA does not include depreciation and amortization expenses, in order to eliminate the impact of capital investments, which we evaluate by comparing capital expenditures to incremental revenue generated and as a percentage of total revenues. Adjusted EBITDA and Adjusted EBITDA Margin should be considered in addition to, but not as a substitute for, other measures of financial performance reported in accordance with GAAP, such as operating income, income (loss) from continuing operations, net income (loss) or cash flows from operating activities from continuing operations (as determined in accordance with GAAP). 40 S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I S e c t i o n X

www.ironmountain.com Selected metric definitions are available in the Appendix Appendix Non-GAAP Measures (continued) Funds From Operations, or FFO (NAREIT), and FFO (Normalized) Funds from operations (“FFO”) is defined by the National Association of Real Estate Investment Trusts ("NAREIT") and us as net income excluding depreciation on real estate assets and gain on sale of real estate, net of tax (“FFO (NAREIT)”). FFO (NAREIT) does not give effect to real estate depreciation because these amounts are computed, under GAAP, to allocate the cost of a property over its useful life. Because values for well- maintained real estate assets have historically increased or decreased based upon prevailing market conditions, we believe that FFO (NAREIT) provides investors with a clearer view of our operating performance. Our most directly comparable GAAP measure to FFO (NAREIT) is net income. Although NAREIT has published a definition of FFO, modifications to FFO (NAREIT) are common among REITs as companies seek to provide financial measures that most meaningfully reflect their particular business. Our definition of FFO (Normalized) excludes certain items included in FFO (NAREIT) that we believe are not indicative of our core operating results, specifically: (1) loss (gain) on disposal/write-down of property, plant and equipment (excluding real estate), net; (2) intangible impairments; (3) other expense (income), net; (4) deferred income taxes and REIT tax adjustments; (5) Recall Costs; (6) REIT Costs; (7) loss (income) from discontinued operations, net of tax; and (8) loss (gain) on sale of discontinued operations, net of tax. FFO (Normalized) – New Definition Our definition of FFO (Normalized) excludes certain items included in FFO (NAREIT) that we believe are not indicative of our core operating results, specifically: (1) loss (gain) on disposal/write-down of property, plant and equipment (excluding real estate), net; (2) intangible impairments; (3) other expense (income), net; (4) the tax impact of reconciling items and discrete tax items; (5) Recall Costs; (6) REIT Costs; (7) loss (income) from discontinued operations, net of tax; and (8) loss (gain) on sale of discontinued operations, net of tax. FFO (Normalized) per share FFO (Normalized) divided by weighted average fully-diluted shares outstanding. Service Adjusted EBITDA Service Adjusted EBITDA is calculated by taking service revenues excluding terminations and permanent withdrawals less direct expenses and allocated overhead tied to the service business. Terminations and permanent withdrawals are excluded from this calculations as they are included in the Storage NOI calculation. 41 S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I S e c t i o n X

www.ironmountain.com Selected metric definitions are available in the Appendix Appendix Non-GAAP Measures (continued) Service Adjusted EBITDAR Service Adjusted EBITDA as defined above, excluding rent expense associated with the service business. This is provided to enable valuation of Service Adjusted EBITDA irrespective of whether the company’s properties are leased or owned. Related rent expense is provided in the Components of Value slide. Storage Adjusted EBITDA Storage Adjusted EBITDA is calculated by taking storage revenues including terminations and permanent withdrawal fees less direct expenses and allocated overhead tied to the storage business. Storage Net Operating Income, or Storage NOI Storage NOI is defined as revenue from rental activities (storage rental revenue, termination fees and permanent withdrawal fees) less storage rental costs. Storage rental costs include facility costs (excluding rent), storage rental labor, other storage costs and allocated overhead. Storage NOI is commonly used in the REIT industry and enables investors to understand and value the income generated from the company’s real estate. Rent expense is excluded to enable valuation of this income irrespective of whether the company’s properties are leased or owned. Related rent expense is provided in the Components of Value slide. 42 S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I S e c t i o n X

www.ironmountain.com Selected metric definitions are available in the Appendix Appendix Definitions Average Stabilization Period – For racking projects, the stabilization period is 8 to 12 months. For new buildings it is 24 to 36 months, assuming phased racking installations over three years. For business acquisitions it is 12 to 24 months, depending on the size of the transaction. Building Development Projects – The construction of new facilities, or three-wall additions. Business Segments North American Records and Information Management Business (“RIM”) – Our North American Records and Information Management Business segment provides records and information management services, including the storage of physical records, including media such as microfilm and microfiche, master audio and videotapes, film, x-rays and blueprints, including healthcare information services, vital records services, service and courier operations, and the collection, handling and disposal of sensitive documents for corporate customers (“Records Management”); Destruction; and Information Governance and Digital Solutions throughout the United States and Canada; as well as fulfillment services and technology escrow services in the United States. North American Data Management Business (“DM”) – Our North American Data Management Business segment provides storage and rotation of backup computer media as part of corporate disaster recovery plans, including service and courier operations (“Data Protection & Recovery”); server and computer backup services; digital content repository systems to house, distribute, and archive key media assets; and storage, safeguarding and electronic or physical delivery of physical media of all types, primarily for entertainment and media industry clients throughout the United States and Canada. Western European Business – Our Western European Business segment provides records and information management services, including Records Management, Data Protection & Recovery and Information Governance and Digital Solutions throughout Austria, Belgium, France, Germany, Ireland, the Netherlands, Spain, Switzerland and the United Kingdom (consisting of our operations in England, Northern Ireland and Scotland), as well as Information Governance and Digital Solutions in Sweden (the remainder of our business in Sweden is included in the Other International Business segment described on the following page). 43 S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I S e c t i o n X

www.ironmountain.com Selected metric definitions are available in the Appendix Appendix Definitions (continued) Other International Business – Our Other International Business segment provides records and information management services throughout the remaining European countries in which we operate, Latin America, Asia Pacific and Africa. Our European operations included in this segment provide records and information management services, including Records Management, Data Protection & Recovery and Information Governance and Digital Solutions throughout the Czech Republic, Denmark, Finland, Greece, Hungary, Norway, Poland, Romania, Russia, Serbia, Slovakia, Turkey and Ukraine; Records Management and Information Governance and Digital Solutions in Estonia, Latvia and Lithuania; and Records Management in Sweden. Our Latin America operations provide records and information management services, including Records Management, Data Protection & Recovery, Destruction and Information Governance and Digital Solutions throughout Argentina, Brazil, Chile, Colombia, Mexico and Peru. Our Asia Pacific operations provide records and information management services, including Records Management, Data Protection & Recovery, Destruction and Information Governance and Digital Solutions throughout Australia and New Zealand, with Records Management and Data Protection & Recovery also provided in certain markets in China (including Taiwan), Hong Kong- SAR, India, Malaysia, Singapore and Thailand. Our African operations provide Records Management, Data Protection & Recovery and Information Governance and Digital Solutions in South Africa. Corporate and Other – Our Corporate and Other Business segment primarily consists of our data center and fine art storage businesses in the United States, the primary product offerings of our Adjacent Businesses operating segment, as well as costs related to executive and staff functions, including finance, human resources and information technology, which benefit the enterprise as a whole. These costs are primarily related to the general management of these functions on a corporate level and the design and development of programs, policies and procedures that are then implemented in the individual segments, with each segment bearing its own cost of implementation. Our Corporate and Other Business segment also includes stock-based employee compensation expense associated with all stock options, restricted stock units, performance units and shares of stock issued under our employee stock purchase plan. Capacity Measures Building Capacity – The maximum number of cubic feet of records or standard DPUs that can be stored in a given facility. Building Capacity Utilization – The number of cubic feet of records or standard DPUs in storage divided by the Building Capacity. Installed Racking Capacity – The storage capacity of the racking installed in a given facility. Capacity is generally measured in cubic feet or standard DPUs. Installed Racking Capacity Utilization – The number of cubic feet of records or standard DPUs in storage divided by the Installed Racking Capacity. 44 S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I S e c t i o n X

www.ironmountain.com Selected metric definitions are available in the Appendix Appendix 45 Definitions (continued) Capital Expenditures and Investments – Our business requires capital expenditures to support our expected storage rental revenue and service revenue growth and ongoing operations, new products and services and increased profitability. The majority of our capital goes to support business line growth and our ongoing operations. Additionally, we invest capital to acquire or construct real estate. We also expend capital to support the development and improvement of products and services and projects designed to increase our profitability. These expenditures are generally relatively small and discretionary in nature. We categorize our capital expenditures as follows: Real Estate: Investment – Real estate assets that support core business growth primarily related to investments in land, buildings, building improvements, leasehold improvements and racking structures that expand our revenue capacity in existing or new geographies, replace a long-term operational obligation or create operational efficiencies, or Real Estate Investment. Maintenance – Real estate assets necessary to maintain ongoing business operations primarily related to the repair or replacement of real estate assets such as buildings, building improvements, leasehold improvements and racking structures, or Real Estate Maintenance. Non-Real Estate: Investment – Non-real estate assets that either (i) support the growth of our business, and/or increase our profitability, such as customer- inventory technology systems, and technology service storage and processing capacity, or (ii) are directly related to the development of core products or services in support of our integrated value proposition and enhance our leadership position in the industry, including items such as increased feature functionality, security upgrades or system enhancements, or Non-Real Estate Investment. Maintenance – Non-real estate assets necessary to maintain ongoing business operations primarily related to the repair or replacement of customer-facing assets such as containers and shred bins, warehouse equipment, fixtures, computer hardware, or third-party or internally- developed software assets. This category also includes operational support initiatives such as sales and marketing and information technology projects to support infrastructure requirements, or Non-Real Estate Maintenance. Innovation and Growth Investment: Discretionary capital expenditures in significant new products/services in new, existing or adjacent business opportunities. S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I S e c t i o n X

www.ironmountain.com Selected metric definitions are available in the Appendix Appendix 46 Definitions (continued) Capital Expenditures and Investments (continued) Components of Overhead Allocated Overhead – Includes overhead expenses directly associated with storage and service business operations allocated as follows: Field Operation Costs – Allocated to storage and service operations based on percent of revenue. Bad Debt Expenses – Allocated to storage and service operations based on percent of revenue. Transportation Costs – Allocated fully to service operations. Corporate Overhead – Includes all other overhead expenses associated with business support functions, including: Executive, Legal, Real Estate/Facilities, Accounting, Financial Performance & Analysis, Treasury, Tax, Internal Audit, M&A, Security, Procurement, HR, REIT, Other G&A, Integration Costs, IT, Product Engineering and Product Management. Customer Turnover Overhead – Overhead associated with customer acquisition and retention including Sales, Marketing and Account Management expenses. Constant Dollar Growth (C$) – The year-over-year growth rate excluding the impact of changes to foreign currency exchange rates. Constant currency growth rates are a non-GAAP measure calculated by translating the 2015 results at the 2016 constant dollar budget rates. Cumulative Investment to Date – Total spend to date since project approval. Customer Inducements – Represents Move Costs and Permanent Withdrawal Fees. Destruction Rate – Calculated by dividing the total number of cubic feet of records removed from inventory due to destructions in a one-year period divided by the total number of cubic feet of records in storage at the beginning of the period. DPUs – Data protection units, a unit of measurement specific to our Data Protection storage services. Estimated CuFt / DPUs – Estimated based on expected growth and consolidation, resulting from moving boxes from one facility to another. Historical Average NOI / CF or DPU – The quarterly annualized Storage NOI for a specific region (NA, Europe, Africa, Latin America, Asia Pacific) and product (Records Management or Data Protection). S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I S e c t i o n X

www.ironmountain.com Selected metric definitions are available in the Appendix Appendix 47 Definitions (continued) Internal Revenue Growth – Our internal revenue growth rate, which is a non-GAAP measure, represents the weighted average year-over-year growth rate of our revenues excluding the impact of business acquisitions, divestitures and foreign currency exchange rate fluctuations. The revenues generated by Recall have been integrated with our existing revenues and it is impracticable for us to determine actual Recall revenue contribution. Therefore, our internal revenue growth rates exclude the impact of revenues associated with the Recall Transaction based upon forecasted or budgeted Recall revenues beginning in the third quarter of 2016. Our internal revenue growth rate includes the impact of acquisitions of customer relationships. Investment in Current Period – Spend within the quarter being reported. Lease Adjusted Leverage Ratio – The calculation for this ratio is EBITDA plus rent expense divided by net debt including the capitalized value of lease obligations. Net Volume Growth – New Records Management storage volume from existing customers, plus volume from new customers and volume from acquisitions, offset by volume related to destructions, permanent withdrawals and customer terminations. Quarterly percentages are calculated by dividing the trailing four quarters’ total activity by the ending balance of the same prior-year period. Non-Cash Rent Expense – Calculated as rent expense less cash paid for rent. Permanent Withdrawal Rate – Calculated by dividing the total number of cubic feet of records removed from inventory due to permanent withdrawals in a one-year period divided by the total number of cubic feet of records in storage at the beginning of the period. Permanent withdrawals occur when records are permanently removed from inventory by customers for reasons other than the customer terminating its relationship. Racking Installations – Defined as any incremental racking spend on buildings constructed or operated prior to January 1, 2014. Racking projects are tracked from first dollar spent until completion, which is defined as when the first box is entered into storage. Racking spend on buildings constructed subsequent to January 1, 2014 is included in Building Development Projects. Recall Costs – Operating expenditures associated with our acquisition of Recall, including operating expenditures to complete the Recall Transaction, including advisory and professional fees and costs to complete the divestments required in connection with receipt of regulatory approval and to provide transitional services required to support the divested businesses during a transition period, as well as operating expenditures to integrate Recall with our existing operations, including moving, severance, facility upgrade, REIT conversion and system upgrade costs. REIT Costs – Costs associated with our conversion to a REIT, excluding REIT compliance costs beginning January 1, 2014. REIT Countries – Countries where we operate that have been converted into a qualified REIT subsidiary and taxable REIT subsidiary structure, the group includes the following: Australia, Canada, Germany, Ireland, Mexico, Netherlands, Poland, Spain, United Kingdom and the United States. S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I S e c t i o n X

www.ironmountain.com Selected metric definitions are available in the Appendix Appendix 48 Definitions (continued) Service Profit and Margin – The Gross Profit and Margin attributable to the worldwide service business. Calculated as follows: Services Adj. EBITDA + Allocated Overhead Expenses + Termination and Permanent Withdrawal Fees = Service Profit ($) / Total Service Revenues (including Termination and Permanent Withdrawal Fees) = Service Margin (%) Storage Profit and Margin – The Gross Profit and Margin attributable to the worldwide storage business. Calculated as follows: Storage Net Operating Income + Allocated Overhead Expenses - Storage Rent - Termination and Permanent Withdrawal Fees = Storage Profit ($) / Total Storage Revenues (excluding Termination and Permanent Withdrawal Fees) = Storage Margin (%) Tangible Assets – Includes PP&E, cash and cash equivalents, restricted cash, accounts receivable, deferred income taxes, and prepaid expenses. Tax Rates Effective Tax Rate – GAAP tax rate for the period calculated as tax expense or benefit for the quarter (total of current and deferred tax provisions), including discrete items, and divided by profit before tax for the period. Structural Tax Rate – Estimated tax rate for the full fiscal year based on forecasted ordinary income and forecasted tax expense/benefit excluding any significant unusual or infrequently occurring items (i.e., discrete items) and items recognized net of tax on the financials (i.e., discontinued operations). S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I S e c t i o n X

www.ironmountain.com Selected metric definitions are available in the Appendix Appendix 49 Definitions (continued) Total Expected Investment – Is defined as follows: Total Expected Investment for Racking Installations – The sum of expected investments for all approved racking projects, reported on a constant dollar basis. Total Expected Investment for Building Development Projects – The sum of expected investments for all approved building projects, including the expected costs of approved racking installations, reported on a constant dollar basis. Transformation Initiative – During the third quarter of 2015, we implemented a plan that calls for certain organizational realignments to reduce our overhead costs, particularly in our developed markets, in order to optimize our selling, general and administrative cost structure and to support investments to advance our growth strategy, which is expected to be completed by the end of 2017. Volume Retention Rate – One minus the result of dividing the total number of cubic feet of records removed from inventory due to customer terminations and destructions in a one-year period by the total number of cubic feet of records in storage at the beginning of the period. S e c t i o n   V I I I S e c t i o n I X S e c t i o n V I I S e c t i o n V I S e c t i o n V S e c t i o n I V S e c t i o n I I I S e c t i o n I I S e c t i o n I S e c t i o n X