IRM IRON MOUNTAIN INC: institutional ownership and insider trading
1,244 funds reported holding $37.0B of IRON MOUNTAIN INC in their latest 13F filings; in Q2 2026 funds net bought $483M, with 140 new positions and 61 funds selling out; over the last 12 months insiders bought $2.95K and sold $118M on the open market.
Famous investors holding IRM
- Ken Griffin (Citadel Advisors): $79.4M, 0.0% of the portfolio
- Izzy Englander (Millennium Management): $31.8M, 0.0% of the portfolio
- D. E. Shaw (D. E. Shaw & Co.): $18.7M, 0.0% of the portfolio
- Two Sigma (Two Sigma Investments): $8.93M, 0.0% of the portfolio
- Renaissance Technologies (Renaissance Technologies): $973K, 0.0% of the portfolio
Largest institutional holders of IRM
- BlackRock, Inc. (BLK) — $4.24B
- VANGUARD GROUP INC — $3.87B
- VANGUARD PORTFOLIO MANAGEMENT LLC — $3.23B
- VANGUARD CAPITAL MANAGEMENT LLC — $2.39B
- STATE STREET CORP (STT, STT-PG) — $2.24B
- COHEN & STEERS, INC. (CNS) — $1.52B
- GEODE CAPITAL MANAGEMENT, LLC — $1.09B
- FMR LLC — $994M
- DIMENSIONAL FUND ADVISORS LP — $584M
- MORGAN STANLEY (MS, MS-PA, MS-PE, MS-PF, MS-PI, MS-PK, MS-PL, MS-PO, MS-PP, MS-PQ) — $559M
Recent IRM insider trades
- Oct 1, 2026: Meaney William L sold 38,474 shares ($4.25M)
- Oct 1, 2026: McIntosh Greg W sold 5,000 shares ($554K)
- Sep 1, 2026: Meaney William L sold 38,474 shares ($4.39M)
- Sep 1, 2026: Kidd Mark sold 6,000 shares ($694K)
5%+ owners
- Vanguard Portfolio Management: 8.4% (Schedule 13G, filed Apr 29, 2026)
- Vanguard Capital Management: 7.4% (Schedule 13G, filed Apr 30, 2026)