IRM Investor Presentation

UPDATE ON THIRD QUARTER 2023 Q3 ACCOMPLISHMENTS Record quarterly performance О Revenue of $1.4 billion O Adjusted EBITDA of $500 million O AFFO of $290 million O AFFO/Share of $0.99 Net income of $91 million Storage: Organic storage rental revenue growth of 10%, led by Global RIM at 8%, reflecting continued benefit of pricing combined with positive volume trends ALM: Consistent revenue performance and strengthening Enterprise bookings O Signed agreement to acquire Regency Technologies Data Center: Leased 65 megawatts of capacity in the quarter, for a total of 120 megawatts this year IRON MOUNTAIN® ($M, Except per Share Data) Three Months Ended 9/30/23 9/30/22 YOY % A Reported $ Constant Fx Storage Rental Revenue $859 $760 13% 12% Service Revenue $530 $527 1% Total Revenue $1,389 $1,287 8% 7% Net Income $91 $193 (53)% Reported EPS $0.31 $0.66 (53)% Adj. EPS $0.45 $0.48 (6)% Adj. EBITDA $500 $469 7% 6% Adj. EBITDA Margin 36.0% 36.5% -50 bps AFFO $290 $288 1% AFFO per Share $0.99 $0.98 1% IRM INVESTOR PRESENTATION 20

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