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: 2026-05-20 10b5-1 Pre-arranged Plan: Yes --- Issuer --- Name: IRON MOUNTAIN INC (IRM) CIK: 0001020569 --- Reporting Owner --- Name: RAKOWICH WALTER C CIK: 0001202432 Role: Director --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock, par value $.01 per share Date: 2026-05-20 | Code: S (Open market sale) Shares: -757 | Price: $124.45 Total Value: $94,208.65 Shares Owned After: 1,135 | Ownership: D (Direct) Footnotes: [F1] The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 12, 2024. --- Holdings --- [Holding #1] Security: Common Stock, par value $.01 per share Ownership: I (Indirect) Footnotes: [F2] Shares held of record by Rakowich Living Trust. The reporting person is the sole trustee. --- Footnotes (Complete Index) --- F1: The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 12, 2024. F2: Shares held of record by Rakowich Living Trust. The reporting person is the sole trustee. --- Signature --- /s/ /s/ Keely Stewart, under Power of Attorney dated April 17, 2023, from Walter C. Rakowich (2026-05-21)