COHEN & STEERS, INC. - 30 Sep 2025 SCHEDULE 13G Report for Iron Mountain, Inc. Common Stock (IRM)

Filing Manager
COHEN & STEERS, INC.
Reporting Manager
Cohen & Steers, Inc.
Security
Iron Mountain, Inc. Common Stock
Symbol
IRM
Shares outstanding
295,211,087 shares
Disclosed Ownership
16,029,962 shares
Ownership
5.4%
Form type
SCHEDULE 13G
Filing time
14 Nov 2025, 06:40:51 UTC
Date of event
30 Sep 2025
Previous filing
07 Mar 2025
Next filing
13 Feb 2026
SEC
View on sec.gov

Quoteable Key Fact

"COHEN & STEERS, INC. disclosed 5.4% ownership in Iron Mountain, Inc. Common Stock (IRM) on 30 Sep 2025."

Quick Takeaways

  • COHEN & STEERS, INC. filed SCHEDULE 13G for Iron Mountain, Inc. Common Stock (IRM).
  • Disclosed ownership: 5.4%.
  • Date of event: 30 Sep 2025.

What Changed

  • Previous schedule filing date: 07 Mar 2025.
  • Current filing was accepted on 14 Nov 2025, 06:40.

Why This Matters

  • This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
  • You can verify ownership claims directly against the original SEC filing.

Source Evidence

Backed by Schedule 13D/13G

Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.

See Original Filing

Reporting Managers (5)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
Cohen & Steers, Inc. 5.4% 16,029,962 12,328,467 0 /s/ Nargis Hilal SVP, Global Chief Compliance Officer & Associate General Counsel
Cohen & Steers Capital Management, Inc. 5.4% 15,841,858 12,243,203 0 /s/ Nargis Hilal SVP, Global Chief Compliance Officer & Associate General Counsel
Cohen & Steers UK Limited 0.06% 171,788 68,948 0 /s/ Nargis Hilal SVP, Global Chief Compliance Officer & Associate General Counsel
Cohen & Steers Asia Limited 0% 0 0 0 /s/ Catherine Cheng VP, Compliance Officer
Cohen & Steers Ireland Limited 0.01% 16,316 16,316 0 /s/ Alan Cooper VP, Compliance Officer