Iron MountainIRM
13F holders, Q2 2025 (June 30)1,044holders +49
109new positions
61sold out
9famous investors
$102.58avg. 13F price*
At the end of Q2 2025, 1,044 institutions reported holding Iron Mountain Inc. (IRM) in their 13F filings, up 49 from Q1 2025. 109 opened new positions and 61 sold out. The largest holders were Vanguard Group Inc. ($4.8B), BlackRock, Inc. ($3.2B) and State Street Corp. ($1.7B). 9 famous investors held it, including Steve Cohen (0.3% of Point72 Asset Management's portfolio), David E. Shaw (0.1% of D. E. Shaw & Co.'s portfolio) and Joel Greenblatt (0.1% of Gotham Asset Management's portfolio).
- Company
- Iron Mountain Inc.
- Filed as
- IRON MTN INC DEL (Q2 2025)
- Sector
- Real Estate
- CUSIP
- 46284V101
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q1 2025 → Q2 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 109 | $218.1M |
| Exits | 61 | $103.8M |
All 13F filers, Q1 2025 → Q2 2025: 17,928,912 shares bought and 14,270,074 shares sold, net +3,658,838 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 1,044 holders
| Vanguard Group Inc. | 0.08% | Add +0.5% | 47,064,887 | $4.8B |
| BlackRock, Inc. | 0.06% | Reduce -11.2% | 31,278,627 | $3.2B |
| State Street Corp. | 0.07% | Add +0.6% | 16,809,643 | $1.7B |
| Cohen & Steers, Inc. | 2.59% | Add +2.1% | 13,768,631 | $1.4B |
| Geode Capital Management, LLC | 0.06% | Reduce -2.4% | 8,086,718 | $826.2M |
| FMR LLC | 0.04% | Add +26.7% | 6,697,419 | $687.0M |
| Dimensional Fund Advisors LP | 0.10% | Add +0.8% | 4,292,766 | $440.3M |
| Invesco Ltd. | 0.07% | Add +50.6% | 4,289,583 | $440.0M |
| Norges Bank | 0.05% | Add +10.8% | 4,089,466 | $419.5M |
| Northern Trust Corp. | 0.06% | Reduce -4.7% | 4,067,808 | $417.2M |
| Charles Schwab Investment Management Inc. | 0.06% | Add +4.0% | 3,625,808 | $371.9M |
| Morgan Stanley | 0.02% | Add +3.5% | 3,506,483 | $359.7M |
| Deutsche Bank AG | 0.13% | Add +9.1% | 3,429,481 | $351.8M |
| Legal & General Group Plc | 0.08% | Add +3.1% | 3,283,276 | $336.8M |
| Daiwa Securities Group Inc. | 1.12% | Add +7.4% | 2,954,927 | $303.1M |
| Principal Financial Group Inc. | 0.14% | Add +185.9% | 2,584,856 | $265.1M |
| Pictet Asset Management Holding SA | 0.26% | Reduce -0.0% | 2,475,671 | $253.9M |
| Contour Asset Management LLC | 7.83% | Add +63.6% | 2,335,348 | $239.5M |
| Capital World Investors | 0.03% | No change | 2,117,169 | $217.2M |
| Nuveen, LLC | 0.06% | Reduce -8.0% | 2,054,789 | $210.8M |
| Royal Bank of Canada | 0.04% | Add +310.3% | 2,042,795 | $209.5M |
| Centersquare Investment Management LLC | 2.16% | Add +1.1% | 2,030,916 | $208.3M |
| JPMorgan Chase & Co. | 0.01% | Reduce -4.3% | 1,972,998 | $202.4M |
| Prudential Financial Inc. | 0.26% | Add +44.7% | 1,945,769 | $199.6M |
| Goldman Sachs Group Inc. | 0.03% | Reduce -4.8% | 1,879,971 | $192.8M |
| Russell Investments Group, Ltd. | 0.24% | Add +3.0% | 1,823,664 | $187.0M |
| UBS Group AG | 0.04% | Add +57.2% | 1,800,227 | $184.6M |
| Bank of New York Mellon Corp | 0.03% | Reduce -6.1% | 1,747,476 | $179.2M |
| Ameriprise Financial Inc. | 0.04% | Add +9.7% | 1,705,824 | $175.9M |
| PGGM Investments | 2.78% | Reduce -2.0% | 1,565,792 | $160.6M |
| Amundi | 0.06% | Add +45.5% | 1,600,818 | $159.5M |
| Wellington Management Group LLP | 0.03% | Add +40.0% | 1,493,923 | $153.2M |
| Duff & Phelps Investment Management Co. | 1.78% | Add +10.6% | 1,472,579 | $151.0M |
| Bank of America Corp. | 0.01% | Add +12.0% | 1,249,442 | $128.2M |
| DekaBank Deutsche Girozentrale | 0.20% | Reduce -0.3% | 1,122,500 | $114.8M |
| CBRE Investment Management Listed Real Assets LLC | 1.68% | Add +39.0% | 1,073,098 | $110.1M |
| Point72 Asset Management | 0.26% | Reduce -51.1% | 1,014,379 | $104.0M |
| Sumitomo Mitsui Trust Group, Inc. | 0.06% | Reduce -11.7% | 924,414 | $94.8M |
| Swiss National Bank | 0.05% | Add +7.5% | 889,261 | $91.2M |
| Sei Investments Co. | 0.11% | Add +6.7% | 885,080 | $90.8M |
| HSBC Holdings PLC | 0.05% | Reduce -4.3% | 784,296 | $80.4M |
| Captrust Financial Advisors | 0.18% | Reduce -4.3% | 769,181 | $78.9M |
| Mitsubishi UFJ Asset Management Co., Ltd. | 0.06% | Add +6.9% | 766,588 | $78.6M |
| American Century Companies Inc. | 0.04% | Add +55.5% | 745,266 | $76.4M |
| CIBC Private Wealth Group LLC | 0.13% | Reduce -0.5% | 733,249 | $75.2M |
| Epoch Investment Partners, Inc. | 0.36% | Reduce -4.3% | 683,612 | $70.1M |
| LPL Financial LLC | 0.02% | Add +6.8% | 673,596 | $69.1M |
| Welch & Forbes LLC | 0.86% | Reduce -0.8% | 668,938 | $68.6M |
| T. Rowe Price Associates Inc. | 0.01% | Reduce -23.9% | 627,040 | $64.3M |
| Wells Fargo & Company | 0.01% | Add +2.9% | 625,477 | $64.2M |
| Rhumbline Advisers | 0.05% | Reduce -6.6% | 619,894 | $63.6M |
| Aew Capital Management L P | 3.35% | Reduce -7.4% | 619,677 | $63.6M |
| D. E. Shaw & Co. | 0.06% | Reduce -28.6% | 583,977 | $59.9M |
| Millennium Management | 0.05% | Reduce -17.2% | 575,969 | $59.1M |
| APG Asset Management US Inc. | 0.44% | No change | 582,174 | $58.2M |
| Alliancebernstein L.P. | 0.02% | Reduce -6.4% | 561,286 | $57.6M |
| Adage Capital Partners Gp, L.L.C. | 0.10% | Add +76.2% | 560,252 | $57.5M |
| Asset Management One Co., Ltd. | 0.18% | Add +0.2% | 555,950 | $57.0M |
| Barclays PLC | 0.02% | Reduce -15.6% | 543,696 | $55.8M |
| Nomura Asset Management Co. Ltd. | 0.15% | Add +3.9% | 517,718 | $53.1M |
| Zurich Insurance Group Ltd | 0.41% | New | 513,791 | $52.7M |
| California Public Employees Retirement System | 0.03% | Add +3.1% | 493,885 | $50.7M |
| Border to Coast Pensions Partnership Ltd | 0.90% | No change | 480,000 | $49.2M |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 0.09% | Add +30.1% | 478,180 | $49.0M |
| National Pension Service | 0.04% | Add +0.7% | 476,161 | $48.8M |
| Heitman Real Estate Securities LLC | 3.37% | Reduce -14.2% | 463,518 | $47.5M |
| Schonfeld Strategic Advisors LLC | 0.36% | Add +163.3% | 463,153 | $47.5M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.01% | Add +7.3% | 453,029 | $46.5M |
| California State Teachers Retirement System | 0.05% | Add +4.9% | 452,201 | $46.4M |
| CANADA LIFE ASSURANCE Co | 0.07% | Reduce -1.3% | 437,654 | $44.9M |
| Rockefeller Capital Management L.P. | 0.10% | Reduce -11.4% | 378,889 | $43.9M |
| BNP Paribas Financial Markets | 0.03% | Reduce -26.2% | 426,625 | $43.8M |
| Adelante Capital Management LLC | 3.04% | Add +3.3% | 403,205 | $41.4M |
| Raymond James Financial Inc. | 0.01% | Add +1.5% | 392,942 | $40.3M |
| Balyasny Asset Management L.P. | 0.09% | Reduce -29.9% | 388,197 | $39.8M |
| Voloridge Investment Management, LLC | 0.14% | Reduce -48.4% | 382,076 | $39.2M |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main | 0.04% | Add +215.3% | 377,807 | $38.8M |
| Gillson Capital LP | 2.89% | New | 369,137 | $37.9M |
| Bank of Montreal | 0.02% | Reduce -12.4% | 366,434 | $37.6M |
| Neuberger Berman Group LLC | 0.03% | Add +822.7% | 364,626 | $37.4M |
| Aberdeen Group plc | 0.06% | Add +10.1% | 339,663 | $34.8M |
| Marble Harbor Investment Counsel, LLC | 3.67% | Reduce -1.4% | 328,773 | $33.7M |
| Adell Harriman & Carpenter Inc. | 2.21% | Add +0.8% | 324,300 | $33.3M |
| Swedbank AB | 0.04% | Add +4.0% | 315,060 | $32.3M |
| Blair William & Co. | 0.09% | Reduce -5.0% | 314,130 | $32.2M |
| State Board of Administration of Florida Retirement System | 0.05% | Add +2.1% | 295,986 | $30.4M |
| Macquarie Group Ltd. | 0.04% | Add +2.0% | 288,984 | $29.6M |
| Korea Investment CORP | 0.06% | Reduce -17.8% | 275,470 | $28.3M |
| Worldquant Millennium Advisors LLC | 0.14% | Add +2.8% | 268,157 | $27.5M |
| Regions Financial Corp. | 0.18% | Add +2.9% | 248,286 | $25.5M |
| Andra AP-fonden | 0.35% | Reduce -10.5% | 245,900 | $25.2M |
| Victory Capital Management Inc. | 0.02% | Add +170.2% | 231,954 | $23.8M |
| Retirement Systems of Alabama | 0.08% | Reduce -0.3% | 231,245 | $23.7M |
| Aviva PLC | 0.05% | Reduce -35.6% | 228,239 | $23.4M |
| New York State Teachers Retirement System | 0.05% | Add +0.1% | 227,925 | $23.4M |
| National Bank of Canada | 0.03% | Reduce -5.1% | 227,389 | $23.3M |
| STRS Ohio | 0.09% | Add +17.7% | 224,612 | $23.0M |
| Pacer Advisors, Inc. | 0.06% | Reduce -9.9% | 220,283 | $22.6M |
| Corient Private Wealth LP | 0.03% | Reduce -1.6% | 220,275 | $22.6M |
| Stifel Financial Corp. | 0.02% | Add +4.9% | 215,236 | $22.1M |
"% of holder's portfolio" is IRM's weight in each manager's 13F, not the share of Iron Mountain Inc. the manager owns.