IRON MOUNTAIN INC files 8-K: results of operations

Item 2.02. Results of Operations and Financial Condition.

On August 5, 2026, Iron Mountain Incorporated, or the Company, issued an earnings press release and supplemental financial information for the quarter ended June 30, 2026. In addition, the Company will be using a slide presentation during its earnings conference call. Copies of the earnings press release, slide presentation and supplemental financial information are furnished as Exhibits 99.1, 99.2 and 99.3, respectively, hereto and posted on the Company’s website, www.ironmountain.com, under “Investors.”

Securities Act of 1933 or the Exchange Act, regardless of any general incorporation language in such filing.

FOR IMMEDIATE RELEASE Iron Mountain Reports Second Quarter 2026 Results • Delivers record quarterly results across all key performance metrics • Achieves quarterly revenue of $2.0 billion, an increase of 18.5% on a reported basis and an increase of 17.6% excluding the effects of foreign exchange • Organic revenue growth of 16.8% year over year in the second quarter • Growth businesses of data center, digital, and asset lifecycle management (ALM) collectively grew more than 50% year over year in the second quarter • Data center leasing of 110 megawatts year to date, including 13 megawatts in Q2 2026 and 75 megawatts in July • Q2 2026 Net Income of $106 million, as compared to a Net Loss of $43 million in Q2 2025 • Delivers quarterly Adjusted EBITDA of $727 million, an increase of 15.7% compared to $628 million in Q2 2025 • Generates quarterly AFFO of $433 million, or $1.44 per share, an increase of 17% compared to last year • Increases 2026 financial guidance driven by strong operational performance across the business PORTSMOUTH, N.H. – August 5, 2026 – Iron Mountain Incorporated (NYSE: IRM), a global leader in information management services, announces financial results for the second quarter of 2026.

“We delivered another record-breaking quarter, with our second quarter results exceeding our expectations due to our team’s strong execution of our growth plans and the continued trust of our clients. Our ongoing success continues to be driven by the collective strength in our physical records storage and growth businesses, together with the stewardship we provide to our more than 240,000 customers,” stated William L. Meaney, President and CEO of Iron Mountain. “Looking ahead, we are committed to capitalizing on the significant growth opportunities across our business. We are building momentum in our ALM and digital businesses through increased cross-selling and providing innovative solutions, and we are accelerating data center leasing, with 110 megawatts leased through July. Based on our strong Q2 outperformance and positive outlook, we are increasing our full year guidance.”

Financial Performance Highlights for the Second Quarter of 2026 ($ in millions, except per share data) Three Months Ended Y/Y % Change Year to Date Y/Y % Change 6/30/26 6/30/25 Reported $ Constant Fx 6/30/26 6/30/25 Reported $ Constant Fx Storage Rental Revenue $1,135 $1,010 12% 12% $2,229 $1,958 14% 12% Service Revenue $894 $702 27% 26% $1,736 $1,346 29% 27% Total Revenues $2,029 $1,712 19% 18% $3,965 $3,304 20% 18% Net Income (Loss) $106 $(43) n/a $255 $(27) n/a Reported EPS $0.34 $(0.15) n/a $0.82 $(0.10) n/a Adjusted EPS $0.60 $0.48 25% $1.20 $0.92 30% Adjusted EBITDA $727 $628 16% 15% $1,435 $1,208 19% 17% Adjusted EBITDA Margin 35.8% 36.7% -90 bps 36.2% 36.6% -40 bps AFFO $433 $370 17% $859 $718 20% AFFO per share $1.44 $1.24 16% $2.87 $2.41 19% 1

• Total reported revenues for the second quarter were $2.0 billion, compared with $1.7 billion in the second quarter of 2025, an increase of 18.5%. Excluding the impact of foreign currency exchange ("Fx"), total reported revenues increased 17.6% compared to the prior year, driven by an 11.5% increase in storage rental revenue and a 26.3% increase in service revenue. Year to date, total reported revenues increased 20.0%, or 18.1% excluding the impact of Fx. • Net Income for the second quarter was $106.1 million, compared with $(43.3) million loss in the second quarter of 2025, driven primarily by increased Operating Income. Year to date, Net Income was $255.1 million, compared with $(27.1) million loss in 2025. • Adjusted EBITDA for the second quarter was $727.0 million, compared with $628.4 million in the second quarter of 2025, an increase of 15.7%.

On a constant currency basis, Adjusted EBITDA increased by 14.9% in the second quarter, compared to the second quarter of 2025, driven by increased revenue and Adjusted EBITDA across each of our segments and improved operating leverage from our continued transformation activities. Year to date, Adjusted EBITDA increased 18.8%, or 17.1% excluding the impact of Fx. • FFO (Normalized) per share was $1.01 for the second quarter, compared with $0.87 in the second quarter of 2025, an increase of 16.1%. Year to date, FFO (Normalized) per share was $1.99, compared with $1.64 in 2025, or an increase of 21.3%. • AFFO was $432.7 million for the second quarter, compared with $369.7 million in the second quarter of 2025, an increase of 17.0% driven by improved Adjusted EBITDA.

Year to date, AFFO was $858.8 million compared with $718.1 million, or an increase of 19.6%. • AFFO per share was $1.44 for the second quarter, compared with $1.24 in the second quarter of 2025, an increase of 16.1%. Year to date, AFFO per share was $2.87, compared to $2.41 in 2025, or an increase of 19.1%. Dividend On August 5, 2026, Iron Mountain's Board of Directors declared a quarterly cash dividend of $0.864 per share of common stock for the third quarter. The third quarter 2026 dividend is payable on October 2, 2026, to shareholders of record at the close of business on September 15, 2026.

Guidance Iron Mountain increased full year 2026 guidance; details are summarized in the table below. 2026 Guidance(1) ($ in millions, except per share data) Full Year 2026 New Approximate Y/Y % Change at Midpoint Previous Q3 2026 Approximate Y/Y % Change Total Revenue $7,940 - $8,010 ~16% $7,825 - $7,925 ~$1,980 ~13% Adjusted EBITDA $2,945 - $2,975 ~15% $2,925 - $2,965 ~$745 ~13% AFFO $1,760 - $1,780 ~15% $1,735 - $1,755 ~$440 ~12% AFFO Per Share $5.87 - $5.93 ~14% $5.79 - $5.86 ~$1.47 ~11% (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

Q2 2026 Earnings Conference Call and Related Materials The conference call / webcast details, earnings presentation and supplemental financial information, which includes definitions of certain capitalized terms used in this release, are available on Iron Mountain’s Investor Relations website. About Iron Mountain Iron Mountain Incorporated (NYSE: IRM) is trusted by more than 240,000 customers in 61 countries, including approximately 95% of the Fortune 1000, to help unlock value and intelligence from their assets through services that transcend the physical and digital worlds. Our broad range of solutions address their information management, digital transformation, information security, data center and asset lifecycle management needs. Our longstanding commitment to safety, security, sustainability and innovation in support of our customers underpins everything we do. To learn more about Iron Mountain, please visit www.IronMountain.com. Investor Relations Contacts: Mark Rupe Erika Crabtree SVP, Investor Relations Manager, Investor Relations Mark.Rupe@ironmountain.com Erika.Crabtree@ironmountain.com (215) 402-7013 (617) 535-2845 Media Contact: media@ironmountain.com 3