Iron Mountain (IRM) 4: McIntosh Greg W bought 87,960 shares of Performance Units a… (Feb 18, 2026)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-02-16 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: IRON MOUNTAIN INC (IRM) CIK: 0001020569 --- Reporting Owner --- Name: McIntosh Greg W CIK: 0001769841 Role: Officer (EVP, CCO & GM, Global RM) --- Derivative Transactions --- [Transaction #1] Security: Performance Units Date: 2026-02-16 | Code: A (Grant or award) Shares: +87,960 | Price: $0.00 Shares Owned After: 123,144 | Ownership: D (Direct) Footnotes: [F1] Each Performance Unit ("PU") represents a contingent right to receive one share of Iron Mountain Incorporated common stock ("Common Stock"). [F2] The PUs were initially granted to the Reporting Person on March 1, 2023. This Form 4 is being filed to reflect the determination by the Compensation Committee, effective as of February 16, 2026, of the actual award of PUs under the grant after completion of the relevant performance period. [F3] The PU were initially granted to the Reporting Person on March 1, 2023, and will fully vest on March 1, 2026. [F3] The PU were initially granted to the Reporting Person on March 1, 2023, and will fully vest on March 1, 2026. --- Footnotes (Complete Index) --- F1: Each Performance Unit ("PU") represents a contingent right to receive one share of Iron Mountain Incorporated common stock ("Common Stock"). F2: The PUs were initially granted to the Reporting Person on March 1, 2023. This Form 4 is being filed to reflect the determination by the Compensation Committee, effective as of February 16, 2026, of the actual award of PUs under the grant after completion of the relevant performance period. F3: The PU were initially granted to the Reporting Person on March 1, 2023, and will fully vest on March 1, 2026. --- Signature --- /s/ /s/ Christine Zhang, under Power of Attorney dated June 19, 2025, from Greg McIntosh (2026-02-18)