SCHEDULE 13G/A

IRON MTN INC DEL

Common Stock · CUSIP: 46284V101

Event date: 2025-02-28

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• COHEN & STEERS, INC.

  Shares: 12,788,773 · Class: 4.35%

• Cohen & Steers Capital Management, Inc.

  Shares: 12,682,234 · Class: 4.32%

• Cohen & Steers UK Ltd

  Shares: 88,731 · Class: 0.03%

• Cohen & Steers Asia Limited

  Shares: 0 · Class: 0%

• Cohen & Steers Ireland Limited

  Shares: 17,808 · Class: 0.01%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.