Iron MountainIRM
13F holders, Q1 2025 (March 31)995holders −71
76new positions
143sold out
9famous investors
$85.95avg. 13F price*
At the end of Q1 2025, 995 institutions reported holding Iron Mountain Inc. (IRM) in their 13F filings, down 71 from Q4 2024. 76 opened new positions and 143 sold out. The largest holders were Vanguard Group Inc. ($4.0B), BlackRock, Inc. ($3.0B) and State Street Corp. ($1.5B). 9 famous investors held it, including Steve Cohen (0.5% of Point72 Asset Management's portfolio), Ken Griffin (0.1% of Citadel Advisors's portfolio) and David E. Shaw (0.1% of D. E. Shaw & Co.'s portfolio).
- Company
- Iron Mountain Inc.
- Filed as
- IRON MTN INC DEL (Q1 2025)
- Sector
- Real Estate
- CUSIP
- 46284V101
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2024 → Q1 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 76 | $270.1M |
| Exits | 143 | $402.5M |
All 13F filers, Q4 2024 → Q1 2025: 24,170,372 shares bought and 15,902,795 shares sold, net +8,267,577 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 995 holders
| Vanguard Group Inc. | 0.07% | Add +0.5% | 46,825,734 | $4.0B |
| BlackRock, Inc. | 0.06% | Add +9.8% | 35,222,779 | $3.0B |
| State Street Corp. | 0.06% | Add +0.5% | 16,705,119 | $1.5B |
| Cohen & Steers, Inc. | 2.15% | Reduce -9.6% | 13,481,902 | $1.2B |
| Geode Capital Management, LLC | 0.06% | Add +4.7% | 8,283,383 | $715.9M |
| FMR LLC | 0.03% | Add +691.7% | 5,286,735 | $454.9M |
| Northern Trust Corp. | 0.05% | Reduce -1.4% | 4,267,324 | $367.2M |
| Dimensional Fund Advisors LP | 0.09% | Add +0.9% | 4,256,417 | $366.2M |
| Norges Bank | 0.04% | Add +11.4% | 3,691,474 | $317.6M |
| Charles Schwab Investment Management Inc. | 0.06% | Add +0.3% | 3,487,479 | $300.1M |
| Morgan Stanley | 0.02% | Add +0.1% | 3,389,039 | $291.6M |
| Legal & General Group Plc | 0.07% | Add +0.1% | 3,183,998 | $274.0M |
| Deutsche Bank AG | 0.11% | Reduce -3.4% | 3,144,827 | $270.6M |
| Invesco Ltd. | 0.05% | Add +14.8% | 2,848,954 | $245.1M |
| Daiwa Securities Group Inc. | 1.00% | Reduce -6.6% | 2,752,467 | $236.8M |
| Pictet Asset Management Holding SA | 0.24% | Add +6.3% | 2,476,597 | $213.0M |
| Nuveen, LLC | 0.06% | — | 2,234,200 | $192.2M |
| Capital World Investors | 0.03% | Reduce -44.5% | 2,117,169 | $182.2M |
| Point72 Asset Management | 0.52% | Add +72.8% | 2,075,282 | $178.6M |
| JPMorgan Chase & Co. | 0.01% | Add +17.8% | 2,061,560 | $177.4M |
| Centersquare Investment Management LLC | 1.79% | Add +17.7% | 2,008,437 | $172.8M |
| Goldman Sachs Group Inc. | 0.03% | Add +86.1% | 1,974,922 | $169.9M |
| Bank of New York Mellon Corp | 0.03% | Reduce -8.5% | 1,861,318 | $160.1M |
| Russell Investments Group, Ltd. | 0.21% | Reduce -4.6% | 1,771,114 | $152.3M |
| PGGM Investments | 1.85% | Add +47.4% | 1,597,968 | $137.5M |
| Ameriprise Financial Inc. | 0.04% | Reduce -2.2% | 1,554,684 | $132.4M |
| Contour Asset Management LLC | 5.12% | New | 1,427,250 | $122.8M |
| Prudential Financial Inc. | 0.16% | Reduce -1.4% | 1,344,479 | $115.7M |
| Duff & Phelps Investment Management Co. | 1.34% | Add +6.8% | 1,331,161 | $114.5M |
| Citadel Advisors | 0.11% | Add +107.1% | 1,251,792 | $107.7M |
| UBS Group AG | 0.02% | Add +26.8% | 1,145,286 | $98.5M |
| Bank of America Corp. | 0.01% | Reduce -24.6% | 1,115,592 | $96.0M |
| DekaBank Deutsche Girozentrale | 0.19% | Add +0.3% | 1,126,012 | $95.1M |
| Wellington Management Group LLP | 0.02% | Reduce -31.0% | 1,067,364 | $91.8M |
| Amundi | 0.03% | Reduce -23.6% | 1,099,934 | $91.4M |
| Sumitomo Mitsui Trust Group, Inc. | 0.06% | Add +15.0% | 1,047,116 | $90.1M |
| Principal Financial Group Inc. | 0.04% | Add +117.7% | 904,184 | $77.8M |
| Qube Research & Technologies Ltd | 0.12% | Add +558.7% | 897,982 | $77.3M |
| Sei Investments Co. | 0.09% | Reduce -2.2% | 829,835 | $71.4M |
| Swiss National Bank | 0.05% | Reduce -0.1% | 827,561 | $71.2M |
| T. Rowe Price Associates Inc. | 0.01% | Reduce -6.1% | 824,103 | $70.9M |
| HSBC Holdings PLC | 0.05% | Add +10.3% | 819,862 | $70.5M |
| D. E. Shaw & Co. | 0.09% | Add +7539.7% | 817,446 | $70.3M |
| Captrust Financial Advisors | 0.17% | Add +0.9% | 803,623 | $69.1M |
| CBRE Investment Management Listed Real Assets LLC | 1.02% | Add +42.7% | 772,190 | $66.4M |
| Voloridge Investment Management, LLC | 0.24% | Add +708.7% | 740,591 | $63.7M |
| Mitsubishi UFJ Asset Management Co., Ltd. | 0.06% | Add +9.1% | 717,248 | $61.7M |
| Epoch Investment Partners, Inc. | 0.32% | Reduce -4.5% | 714,025 | $61.4M |
| Millennium Management | 0.06% | Add +2282.1% | 695,894 | $59.9M |
| Welch & Forbes LLC | 0.76% | Reduce -0.8% | 674,042 | $58.0M |
| Aew Capital Management L P | 2.82% | Reduce -1.4% | 669,267 | $57.6M |
| Rhumbline Advisers | 0.05% | Add +4.2% | 664,001 | $57.1M |
| CIBC Private Wealth Group LLC | 0.12% | Reduce -27.5% | 736,855 | $56.7M |
| Barclays PLC | 0.03% | Add +58.9% | 644,046 | $55.4M |
| LPL Financial LLC | 0.02% | Add +10.9% | 630,809 | $54.3M |
| Wells Fargo & Company | 0.01% | Reduce -8.0% | 608,065 | $52.3M |
| Alliancebernstein L.P. | 0.02% | Add +7.9% | 599,714 | $51.6M |
| APG Asset Management US Inc. | 0.39% | Add +13.2% | 582,174 | $50.6M |
| BNP Paribas Financial Markets | 0.04% | Add +16.3% | 578,174 | $49.7M |
| Asset Management One Co., Ltd. | 0.17% | Reduce -1.3% | 555,014 | $47.8M |
| Balyasny Asset Management L.P. | 0.12% | Add +51.0% | 553,548 | $47.6M |
| Heitman Real Estate Securities LLC | 3.01% | Add +256.0% | 540,037 | $46.5M |
| Nomura Asset Management Co. Ltd. | 0.13% | Add +5.0% | 498,109 | $42.9M |
| Royal Bank of Canada | 0.01% | Reduce -0.5% | 497,929 | $42.8M |
| Border to Coast Pensions Partnership Ltd | 0.85% | Add +4.3% | 480,000 | $41.3M |
| California Public Employees Retirement System | 0.03% | Reduce -3.5% | 479,201 | $41.2M |
| American Century Companies Inc. | 0.03% | Reduce -23.4% | 479,116 | $41.2M |
| National Pension Service | 0.04% | Add +17.4% | 472,921 | $40.7M |
| Intech Investment Management LLC | 0.40% | Add +6.8% | 448,761 | $38.6M |
| CANADA LIFE ASSURANCE Co | 0.07% | Add +1.9% | 443,469 | $38.3M |
| California State Teachers Retirement System | 0.05% | Reduce -0.8% | 430,924 | $37.1M |
| Rockefeller Capital Management L.P. | 0.09% | Add +36.7% | 427,565 | $36.9M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.01% | Reduce -0.9% | 422,423 | $36.3M |
| Bank of Montreal | 0.02% | Reduce -33.6% | 418,536 | $36.0M |
| Raymond James Financial Inc. | 0.01% | Reduce -26.4% | 387,280 | $33.3M |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 0.06% | Reduce -2.6% | 367,597 | $31.6M |
| Aviva PLC | 0.07% | Reduce -17.5% | 354,186 | $30.5M |
| Storebrand Asset Management As | 0.09% | Add +68.9% | 338,906 | $29.2M |
| Korea Investment CORP | 0.07% | Add +68.5% | 335,070 | $28.8M |
| Marble Harbor Investment Counsel, LLC | 3.23% | Reduce -3.8% | 333,588 | $28.7M |
| Blair William & Co. | 0.09% | Reduce -1.2% | 330,538 | $28.4M |
| Waterfront Capital Partners, LLC | 4.79% | Add +36.7% | 325,120 | $28.0M |
| Adell Harriman & Carpenter Inc. | 2.09% | Reduce -2.4% | 321,834 | $27.7M |
| Adage Capital Partners Gp, L.L.C. | 0.05% | Add +178.6% | 318,052 | $27.4M |
| Aberdeen Group plc | 0.05% | Reduce -51.0% | 308,646 | $26.4M |
| Swedbank AB | 0.03% | Add +4.9% | 303,030 | $26.1M |
| Jump Financial, LLC | 0.40% | Add +725.9% | 301,333 | $25.9M |
| State Board of Administration of Florida Retirement System | 0.05% | Add +0.2% | 289,806 | $24.9M |
| Macquarie Group Ltd. | 0.03% | Add +9.4% | 283,256 | $24.4M |
| Andra AP-fonden | 0.39% | Add +17.4% | 274,800 | $23.6M |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 0.06% | Reduce -10.0% | 265,331 | $22.8M |
| Worldquant Millennium Advisors LLC | 0.14% | New | 260,981 | $22.5M |
| Pacer Advisors, Inc. | 0.05% | Add +15.6% | 244,486 | $21.0M |
| Regions Financial Corp. | 0.15% | Add +4.5% | 241,276 | $20.8M |
| National Bank of Canada | 0.02% | Add +58.1% | 239,676 | $20.6M |
| Retirement Systems of Alabama | 0.08% | Reduce -0.5% | 232,002 | $20.0M |
| Citigroup Inc. | 0.02% | Add +35.0% | 230,629 | $19.8M |
| New York State Teachers Retirement System | 0.05% | Reduce -9.8% | 227,739 | $19.6M |
| Ensign Peak Advisors, Inc | 0.04% | Reduce -2.2% | 227,016 | $19.5M |
| Corient Private Wealth LP | 0.03% | Add +3.5% | 223,772 | $19.3M |
"% of holder's portfolio" is IRM's weight in each manager's 13F, not the share of Iron Mountain Inc. the manager owns.