Iron Mountain (IRM)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-08-06 10b5-1 Pre-arranged Plan: Yes --- Issuer --- Name: IRON MOUNTAIN INC (IRM) CIK: 0001020569 --- Reporting Owner --- Name: McIntosh Greg W CIK: 0001769841 Role: Officer (EVP, Chief Commercial Officer) --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock, par value $.01 per share Date: 2026-08-06 | Code: S (Open market sale) Shares: -5,000 | Price: $127.13 Total Value: $635,650.00 Shares Owned After: 80,634 | Ownership: D (Direct) Footnotes: [F1] The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 8, 2026. [Transaction #2] Security: Common Stock, par value $.01 per share Date: 2026-08-06 | Code: M (Exercise of derivative) Shares: +6,839 | Price: $37.00 Total Value: $253,043.00 Shares Owned After: 87,473 | Ownership: D (Direct) Footnotes: [F1] The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 8, 2026. [Transaction #3] Security: Common Stock, par value $.01 per share Date: 2026-08-06 | Code: S (Open market sale) Shares: -6,839 | Price: $127.13 Total Value: $869,442.07 Shares Owned After: 80,634 | Ownership: D (Direct) Footnotes: [F1] The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 8, 2026. --- Derivative Transactions --- [Transaction #1] Security: Employee Stock Option (Right to Buy) Date: 2026-08-06 | Code: M (Exercise of derivative) Shares: -6,839 Exercisable: N/A | Expires: 2027-02-16 Shares Owned After: 0 | Ownership: D (Direct) Footnotes: [F1] The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 8, 2026. [F3] Not applicable. [F2] This stock option, representing a right to purchase a total of 6,839 shares, is fully vested. --- Footnotes (Complete Index) --- F1: The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 8, 2026. F2: This stock option, representing a right to purchase a total of 6,839 shares, is fully vested. F3: Not applicable. --- Signature --- /s/ /s/ Christine Zhang, under Power of Attorney dated June 19, 2025, from Greg McIntosh (2026-08-10)