Iron Mountain Inc
IRM- Exchange
- NYSE
- Industry
- Real Estate Investment Trusts
- SEC CIK
- 0001020569
In the last 90 days, Iron Mountain Inc insiders filed 0 open-market purchases and 8 sales; 1,173 institutions reported holding it in 13F filings for Q2 2026, worth $32.4B in total; no superinvestor holds it.
13F holders, Q1 2025
Institutional positions in Iron Mountain Inc as of Mar 31, 2025. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 995
- −56 vs. Q4 2024
- Shares held
- 245.2M
- +10.9M (+4.6%) vs. Q4 2024
- Total value
- $21.1B
- −$3.56B (−14.4%) vs. Q4 2024
- New holders
- 88
- 348 more added
- Sold out
- 144
- 401 more reduced
16 institutions that held it in Q4 2024 haven't filed for Q1 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2024: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting IRM on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 1,173 | $32.4B |
| Q1 2026 | 1,090 | $25.9B |
| Q4 2025 | 1,011 | $21.4B |
| Q3 2025 | 1,017 | $25.5B |
| Q2 2025 | 1,045 | $25.5B |
| Q1 2025 | 995 | $21.1B |
| Q4 2024 | 1,067 | $24.9B |
| Q3 2024 | 1,056 | $28.8B |
| Q2 2024 | 967 | $22.2B |
| Q1 2024 | 938 | $19.0B |
| Q4 2023 | 891 | $16.4B |
| Q3 2023 | 831 | $13.7B |
| Q2 2023 | 817 | $12.9B |
| Q1 2023 | 790 | $12.0B |
| Q4 2022 | 782 | $11.4B |
| Q3 2022 | 743 | $10.0B |
| Q2 2022 | 767 | $10.9B |
| Q1 2022 | 777 | $12.4B |
| Q4 2021 | 754 | $12.0B |
| Q3 2021 | 711 | $9.94B |
| Q2 2021 | 687 | $9.70B |
| Q1 2021 | 630 | $8.44B |
Institutions, Q1 2025
Shares, value and share of portfolio for each institution holding Iron Mountain Inc; share changes are against Q4 2024.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Vanguard Group Inc | 46,825,734 | $4.03B | 0.07% | +220,564+0.5% | Added |
| BlackRock, Inc. | 35,222,779 | $3.03B | 0.06% | +3,149,907+9.8% | Added |
| State Street Corp | 16,705,119 | $1.45B | 0.06% | +83,336+0.5% | Added |
| Cohen & Steers, Inc. | 13,481,902 | $1.16B | 2.14% | −1,425,944−9.6% | Reduced |
| Geode Capital Management, LLC | 8,283,383 | $715.9M | 0.06% | +371,274+4.7% | Added |
| FMR LLC | 5,286,735 | $454.9M | 0.03% | +4,618,996+691.7% | Added |
| Northern Trust Corp | 4,267,324 | $367.2M | 0.05% | −59,152−1.4% | Reduced |
| Dimensional Fund Advisors LP | 4,256,417 | $366.2M | 0.09% | +37,154+0.9% | Added |
| Norges Bank | 3,691,474 | $317.6M | 0.04% | +378,288+11.4% | Added |
| Charles Schwab Investment Management Inc | 3,487,479 | $300.1M | 0.06% | +8,689+0.2% | Added |
| Morgan Stanley | 3,389,039 | $291.6M | 0.02% | +2,824+0.1% | Added |
| Legal & General Group Plc | 3,183,998 | $274.0M | 0.07% | +1,5580.0% | Added |
| Deutsche Bank AG | 3,144,827 | $270.6M | 0.11% | −108,911−3.3% | Reduced |
| Invesco Ltd. | 2,848,954 | $245.1M | 0.05% | +366,134+14.7% | Added |
| Daiwa Securities Group Inc. | 2,752,467 | $236.8M | 1.00% | −194,654−6.6% | Reduced |
| Pictet Asset Management Holding SA | 2,476,597 | $213.0M | 0.24% | +147,575+6.3% | Added |
| Nuveen, LLC | 2,234,200 | $192.2M | 0.06% | +2,234,200 | New |
| Capital World Investors | 2,117,169 | $182.2M | 0.03% | −1,700,248−44.5% | Reduced |
| Point72 Asset Management, L.P. | 2,075,282 | $178.6M | 0.50% | +874,622+72.8% | Added |
| JPMorgan Chase & Co | 2,061,560 | $177.4M | 0.01% | +311,494+17.8% | Added |
| Centersquare Investment Management LLC | 2,008,437 | $172.8M | 1.79% | +302,185+17.7% | Added |
| Goldman Sachs Group Inc | 1,974,922 | $169.9M | 0.03% | +913,715+86.1% | Added |
| Bank of New York Mellon Corp | 1,861,318 | $160.1M | 0.03% | −173,594−8.5% | Reduced |
| Russell Investments Group, Ltd. | 1,771,114 | $152.3M | 0.21% | −84,718−4.6% | Reduced |
| PGGM Investments | 1,597,968 | $137.5M | 1.85% | +513,581+47.4% | Added |
| Ameriprise Financial Inc | 1,554,684 | $132.4M | 0.04% | −35,686−2.2% | Reduced |
| Contour Asset Management LLC | 1,427,250 | $122.8M | 5.12% | +1,427,250 | New |
| Prudential Financial Inc | 1,344,479 | $115.7M | 0.16% | −18,734−1.4% | Reduced |
| Duff & Phelps Investment Management Co | 1,331,161 | $114.5M | 1.34% | +84,850+6.8% | Added |
| Citadel Advisors LLC | 1,251,792 | $107.7M | 0.11% | +647,452+107.1% | Added |
| UBS Group AG | 1,145,286 | $98.5M | 0.02% | +242,022+26.8% | Added |
| Bank of America Corp | 1,115,592 | $96.0M | 0.01% | −362,928−24.5% | Reduced |
| DekaBank Deutsche Girozentrale | 1,126,012 | $95.1M | 0.19% | +3,512+0.3% | Added |
| Wellington Management Group LLP | 1,067,364 | $91.8M | 0.02% | −480,344−31.0% | Reduced |
| Amundi | 1,099,934 | $91.4M | 0.03% | −338,867−23.6% | Reduced |
| Sumitomo Mitsui Trust Holdings, Inc. | 1,047,116 | $90.1M | 0.06% | +136,393+15.0% | Added |
| Principal Financial Group Inc | 904,184 | $77.8M | 0.04% | +488,816+117.7% | Added |
| Qube Research & Technologies Ltd | 897,982 | $77.3M | 0.12% | +761,650+558.7% | Added |
| SEI Investments Co | 829,835 | $71.4M | 0.09% | −18,532−2.2% | Reduced |
| Swiss National Bank | 827,561 | $71.2M | 0.05% | −1,200−0.1% | Reduced |
| Price T Rowe Associates Inc | 824,103 | $70.9M | 0.01% | −53,135−6.1% | Reduced |
| HSBC Holdings PLC | 819,862 | $70.5M | 0.05% | +76,314+10.3% | Added |
| D. E. Shaw & Co., Inc. | 817,446 | $70.3M | 0.08% | +806,746+7,539.7% | Added |
| Captrust Financial Advisors | 803,623 | $69.1M | 0.17% | +7,306+0.9% | Added |
| Cbre Clarion Securities LLC | 772,190 | $66.4M | 1.02% | +231,162+42.7% | Added |
| Voloridge Investment Management, LLC | 740,591 | $63.7M | 0.24% | +649,018+708.7% | Added |
| Mitsubishi UFJ Kokusai Asset Management Co., Ltd. | 717,248 | $61.7M | 0.06% | +59,805+9.1% | Added |
| Epoch Investment Partners, Inc. | 714,025 | $61.4M | 0.32% | −33,525−4.5% | Reduced |
| Millennium Management LLC | 695,894 | $59.9M | 0.06% | +666,681+2,282.1% | Added |
| Welch & Forbes LLC | 674,042 | $58.0M | 0.76% | −5,720−0.8% | Reduced |
| Aew Capital Management L P | 669,267 | $57.6M | 2.82% | −9,620−1.4% | Reduced |
| Rhumbline Advisers | 664,001 | $57.1M | 0.05% | +26,795+4.2% | Added |
| CIBC Private Wealth Group, LLC | 736,855 | $56.7M | 0.12% | −279,321−27.5% | Reduced |
| Barclays PLC | 644,046 | $55.4M | 0.03% | +238,625+58.9% | Added |
| LPL Financial LLC | 630,809 | $54.3M | 0.02% | +61,974+10.9% | Added |
| Wells Fargo & Company | 608,065 | $52.3M | 0.01% | −52,713−8.0% | Reduced |
| Alliancebernstein L.P. | 599,714 | $51.6M | 0.02% | +43,882+7.9% | Added |
| APG Asset Management US Inc. | 582,174 | $50.6M | 0.39% | +67,966+13.2% | Added |
| BNP Paribas Arbitrage, SA | 578,174 | $49.7M | 0.04% | +81,027+16.3% | Added |
| Asset Management One Co.,Ltd. | 555,014 | $47.8M | 0.17% | −7,527−1.3% | Reduced |
| Balyasny Asset Management LLC | 553,548 | $47.6M | 0.12% | +186,880+51.0% | Added |
| Heitman Real Estate Securities LLC | 540,037 | $46.5M | 3.01% | +388,353+256.0% | Added |
| Nomura Asset Management Co Ltd | 498,109 | $42.9M | 0.13% | +23,518+5.0% | Added |
| Royal Bank of Canada | 497,929 | $42.8M | 0.01% | −2,688−0.5% | Reduced |
| Border to Coast Pensions Partnership Ltd | 480,000 | $41.3M | 0.85% | +20,000+4.3% | Added |
| California Public Employees Retirement System | 479,201 | $41.2M | 0.03% | −17,255−3.5% | Reduced |
| American Century Companies Inc | 479,116 | $41.2M | 0.03% | −146,279−23.4% | Reduced |
| National Pension Service | 472,921 | $40.7M | 0.04% | +70,108+17.4% | Added |
| Intech Investment Management LLC | 448,761 | $38.6M | 0.40% | +28,561+6.8% | Added |
| Great West Life Assurance Co | 443,469 | $38.3M | 0.07% | +8,072+1.9% | Added |
| California State Teachers Retirement System | 430,924 | $37.1M | 0.05% | −3,569−0.8% | Reduced |
| Rockefeller Capital Management L.P. | 427,565 | $36.9M | 0.09% | +114,692+36.7% | Added |
| UBS Asset Management Americas Inc | 422,423 | $36.3M | 0.01% | −3,800−0.9% | Reduced |
| Bank of Montreal | 418,536 | $36.0M | 0.02% | −212,173−33.6% | Reduced |
| Raymond James Financial Inc | 387,280 | $33.3M | 0.01% | −138,561−26.4% | Reduced |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 367,597 | $31.6M | 0.06% | −9,979−2.6% | Reduced |
| Aviva PLC | 354,186 | $30.5M | 0.07% | −75,287−17.5% | Reduced |
| Storebrand Asset Management AS | 338,906 | $29.2M | 0.09% | +138,214+68.9% | Added |
| Korea Investment CORP | 335,070 | $28.8M | 0.07% | +136,228+68.5% | Added |
| Marble Harbor Investment Counsel, LLC | 333,588 | $28.7M | 3.23% | −12,982−3.7% | Reduced |
| Blair William & Co | 330,538 | $28.4M | 0.09% | −3,984−1.2% | Reduced |
| Waterfront Capital Partners, LLC | 325,120 | $28.0M | 4.79% | +87,273+36.7% | Added |
| Adell Harriman & Carpenter Inc | 321,834 | $27.7M | 2.09% | −7,995−2.4% | Reduced |
| Adage Capital Partners GP, L.L.C. | 318,052 | $27.4M | 0.05% | +203,900+178.6% | Added |
| Standard Life Aberdeen plc | 308,646 | $26.4M | 0.05% | −321,390−51.0% | Reduced |
| Jump Financial, LLC | 301,333 | $25.9M | 0.39% | +264,847+725.9% | Added |
| State Board of Administration of Florida Retirement System | 289,806 | $24.9M | 0.05% | +580+0.2% | Added |
| Macquarie Group Ltd | 283,256 | $24.4M | 0.03% | +24,284+9.4% | Added |
| Andra AP-fonden | 274,800 | $23.6M | 0.39% | +40,800+17.4% | Added |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 265,331 | $22.8M | 0.06% | −29,348−10.0% | Reduced |
| Worldquant Millennium Advisors LLC | 260,981 | $22.5M | 0.14% | +260,981 | New |
| Pacer Advisors, Inc. | 244,486 | $21.0M | 0.05% | +32,942+15.6% | Added |
| Regions Financial Corp | 241,276 | $20.8M | 0.15% | +10,500+4.5% | Added |
| National Bank of Canada | 239,676 | $20.6M | 0.02% | +88,058+58.1% | Added |
| Retirement Systems of Alabama | 232,002 | $20.0M | 0.08% | −1,174−0.5% | Reduced |
| Citigroup Inc | 230,629 | $19.8M | 0.02% | +59,761+35.0% | Added |
| New York State Teachers Retirement System | 227,739 | $19.6M | 0.05% | −24,892−9.9% | Reduced |
| Ensign Peak Advisors, Inc | 227,016 | $19.5M | 0.04% | −5,184−2.2% | Reduced |
| CI Private Wealth, LLC | 223,772 | $19.3M | 0.03% | +7,630+3.5% | Added |
| Man Group plc | 214,776 | $18.5M | 0.06% | −5,962−2.7% | Reduced |