Momentum to GO BEYOND

Strong start to 2021 ($ in millions, except per share data) Three Months Ended 3/31/21 3/31/20 Y/Y % Change Storage Rental Revenue Service Revenue Total Revenue $708 $684 4% $374 $385 -3% $1,082 $1,069 1% Net Income $47 $65 -28% Adjusted EBITDA(1) $381 $366 4% Adjusted EBITDA Margin (1) 35.2% 34.2% +100 bps AFFO(1) $235 $231 2% AFFO per share(1) $0.81 $0.80 2% Dividend per share $0.62 $0.62 27 IRON MOUNTAINⓇ (1) Reconciliations for Adjusted EBITDA and AFFO to their respective GAAP measures can be found in the Supplemental Financial Information on pages 14 and 16, respectively.

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