IRON MOUNTAIN INC (IRM) · Insider Trading (Form 4) SEC Filing

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-05-07 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: IRON MOUNTAIN INC (IRM) CIK: 0001020569 --- Reporting Owner --- Name: Allerton Jennifer CIK: 0001618762 Role: Director --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock, par value $.01 per share Date: 2026-05-07 | Code: A (Grant or award) Shares: +1,892 | Price: $0.00 Shares Owned After: 13,433 | Ownership: D (Direct) Footnotes: [F1] Consists of shares issuable upon the settlement of restricted stock units ("RSUs") granted on May 7, 2026. The RSUs vest in their entirety on the grant date. [Transaction #2] Security: Common Stock, par value $.01 per share Date: 2026-05-07 | Code: F (Payment of exercise/tax) Shares: -133 | Price: $126.81 Total Value: $16,865.73 Shares Owned After: 13,300 | Ownership: D (Direct) Footnotes: [F2] Represents the number of shares of Common Stock that have been withheld by the Issuer to satisfy its income tax withholding obligation in connection with the net settlement of the RSUs and does not represent a sale. --- Footnotes (Complete Index) --- F1: Consists of shares issuable upon the settlement of restricted stock units ("RSUs") granted on May 7, 2026. The RSUs vest in their entirety on the grant date. F2: Represents the number of shares of Common Stock that have been withheld by the Issuer to satisfy its income tax withholding obligation in connection with the net settlement of the RSUs and does not represent a sale. --- Signature --- /s/ /s/ Christine Zhang, under Power of Attorney dated June 19, 2025, from Jennifer Allerton (2026-05-11)