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 6 sales; 1,173 institutions reported holding it in 13F filings for Q2 2026, worth $32.4B in total; no superinvestor holds it.
13F holders, Q3 2025
Institutional positions in Iron Mountain Inc as of Sep 30, 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
- 1,017
- −13 vs. Q2 2025
- Shares held
- 250.3M
- +5.90M (+2.4%) vs. Q2 2025
- Total value
- $25.5B
- +$450.7M (+1.8%) vs. Q2 2025
- New holders
- 75
- 370 more added
- Sold out
- 88
- 390 more reduced
15 institutions that held it in Q2 2025 haven't filed for Q3 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q2 2025: 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, Q3 2025
Shares, value and share of portfolio for each institution holding Iron Mountain Inc; share changes are against Q2 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| United Bank | 167,520 | $17.1M | 2.04% | −13,489−7.5% | Reduced |
| CIBC World Markets Inc. | 172,450 | $17.6M | 0.04% | +36,859+27.2% | Added |
| Natixis Advisors, L.P. | 172,952 | $17.6M | 0.03% | −6,911−3.8% | Reduced |
| Allworth Financial LP | 173,168 | $17.7M | 0.08% | +765+0.4% | Added |
| State of Wisconsin Investment Board | 174,846 | $17.8M | 0.04% | −5,820−3.2% | Reduced |
| State of Alaska, Department of Revenue | 175,294 | $17.9M | 0.18% | −1,414−0.8% | Reduced |
| Commonwealth Equity Services, LLC | 175,828 | $17.9M | 0.02% | −27,960−13.7% | Reduced |
| TD Asset Management Inc | 176,330 | $18.0M | 0.01% | −3,658−2.0% | Reduced |
| United Capital Financial Advisers, LLC | 176,983 | $18.0M | 0.13% | −5,758−3.2% | Reduced |
| Toronto Dominion Bank | 177,007 | $18.0M | 0.04% | −1,706−1.0% | Reduced |
| Resona Asset Management Co.,Ltd. | 179,352 | $18.1M | 0.09% | +12,160+7.3% | Added |
| Manufacturers Life Insurance Company, The | 180,438 | $18.4M | 0.02% | −5,596−3.0% | Reduced |
| New York State Common Retirement Fund | 182,074 | $18.6M | 0.02% | −26,200−12.6% | Reduced |
| Envestnet Asset Management Inc | 201,212 | $20.5M | 0.01% | −2,815−1.4% | Reduced |
| CI Private Wealth, LLC | 202,524 | $20.6M | 0.03% | −17,751−8.1% | Reduced |
| Moran Wealth Management, LLC | 202,788 | $20.7M | 0.62% | −1,408−0.7% | Reduced |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 203,402 | $20.7M | 0.05% | +4,569+2.3% | Added |
| National Bank of Canada | 203,663 | $20.8M | 0.02% | −23,726−10.4% | Reduced |
| Brookstone Capital Management | 207,443 | $21.1M | 0.25% | +59,383+40.1% | Added |
| Canada Pension Plan Investment Board | 210,283 | $21.4M | 0.02% | +102,327+94.8% | Added |
| Andra AP-fonden | 215,700 | $22.0M | 0.28% | −30,200−12.3% | Reduced |
| Stifel Financial Corp | 218,137 | $22.2M | 0.02% | +2,901+1.3% | Added |
| Victory Capital Management Inc | 222,934 | $22.7M | 0.01% | −9,020−3.9% | Reduced |
| New York State Teachers Retirement System | 227,870 | $23.2M | 0.05% | −550.0% | Reduced |
| Worldquant Millennium Advisors LLC | 230,912 | $23.5M | 0.10% | −37,245−13.9% | Reduced |
| Retirement Systems of Alabama | 230,939 | $23.5M | 0.08% | −306−0.1% | Reduced |
| Pacer Advisors, Inc. | 231,235 | $23.6M | 0.06% | +10,952+5.0% | Added |
| Aviva PLC | 242,449 | $24.7M | 0.04% | +14,210+6.2% | Added |
| Wellington Management Group LLP | 248,892 | $25.4M | 0.00% | −1,245,031−83.3% | Reduced |
| Regions Financial Corp | 251,781 | $25.7M | 0.17% | +3,495+1.4% | Added |
| Cetera Investment Advisers | 254,352 | $25.9M | 0.03% | +84,900+50.1% | Added |
| STRS Ohio | 257,515 | $26.3M | 0.10% | +32,903+14.6% | Added |
| State Board of Administration of Florida Retirement System | 270,757 | $27.6M | 0.05% | −25,229−8.5% | Reduced |
| Swedbank AB | 284,858 | $29.0M | 0.03% | −30,202−9.6% | Reduced |
| Macquarie Group Ltd | 286,584 | $29.2M | 0.03% | −2,400−0.8% | Reduced |
| Gillson Capital LP | 286,900 | $29.2M | 2.54% | −82,237−22.3% | Reduced |
| KBC Group NV | 292,478 | $29.8M | 0.07% | +226,790+345.3% | Added |
| Aew Capital Management L P | 315,257 | $32.1M | 1.79% | −304,420−49.1% | Reduced |
| Blair William & Co | 318,410 | $32.5M | 0.09% | +4,280+1.4% | Added |
| Marble Harbor Investment Counsel, LLC | 325,260 | $33.2M | 3.47% | −3,513−1.1% | Reduced |
| Adell Harriman & Carpenter Inc | 326,315 | $33.3M | 2.02% | +2,015+0.6% | Added |
| Standard Life Aberdeen plc | 382,634 | $38.4M | 0.06% | +42,971+12.7% | Added |
| Raymond James Financial Inc | 380,348 | $38.8M | 0.01% | −12,594−3.2% | Reduced |
| Adelante Capital Management LLC | 386,285 | $39.4M | 2.72% | −16,920−4.2% | Reduced |
| Bank of Montreal | 398,180 | $40.6M | 0.02% | +31,746+8.7% | Added |
| Rockefeller Capital Management L.P. | 407,455 | $41.6M | 0.08% | +28,566+7.5% | Added |
| Neuberger Berman Group LLC | 416,248 | $42.4M | 0.03% | +51,622+14.2% | Added |
| Citigroup Inc | 419,723 | $42.8M | 0.03% | +215,308+105.3% | Added |
| Bamco Inc | 436,831 | $44.5M | 0.12% | +329,307+306.3% | Added |
| Great West Life Assurance Co | 445,064 | $44.7M | 0.06% | +7,410+1.7% | Added |
| California State Teachers Retirement System | 440,557 | $44.9M | 0.05% | −11,644−2.6% | Reduced |
| AQR Capital Management LLC | 457,472 | $46.4M | 0.03% | +351,463+331.5% | Added |
| Heitman Real Estate Securities LLC | 474,368 | $48.4M | 3.30% | +10,850+2.3% | Added |
| Border to Coast Pensions Partnership Ltd | 480,000 | $48.9M | 0.85% | 00.0% | Unchanged |
| Millennium Management LLC | 485,417 | $49.5M | 0.04% | −90,552−15.7% | Reduced |
| National Pension Service | 495,480 | $50.5M | 0.04% | +19,319+4.1% | Added |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 497,720 | $50.7M | 0.08% | +19,540+4.1% | Added |
| California Public Employees Retirement System | 513,415 | $52.3M | 0.03% | +19,530+4.0% | Added |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main | 515,006 | $52.5M | 0.05% | +137,199+36.3% | Added |
| BNP Paribas Arbitrage, SA | 526,270 | $53.6M | 0.04% | +99,645+23.4% | Added |
| Nomura Asset Management Co Ltd | 529,048 | $53.9M | 0.14% | +11,330+2.2% | Added |
| Asset Management One Co.,Ltd. | 551,714 | $56.2M | 0.16% | −4,236−0.8% | Reduced |
| American Century Companies Inc | 552,049 | $56.3M | 0.03% | −193,217−25.9% | Reduced |
| Adage Capital Partners GP, L.L.C. | 553,420 | $56.4M | 0.09% | −6,832−1.2% | Reduced |
| Alliancebernstein L.P. | 555,994 | $56.7M | 0.02% | −5,292−0.9% | Reduced |
| APG Asset Management US Inc. | 582,174 | $59.5M | 0.44% | 00.0% | Unchanged |
| Price T Rowe Associates Inc | 595,595 | $60.7M | 0.01% | −31,445−5.0% | Reduced |
| Rhumbline Advisers | 596,637 | $60.8M | 0.05% | −23,257−3.8% | Reduced |
| Wells Fargo & Company | 637,840 | $65.0M | 0.01% | +12,363+2.0% | Added |
| Epoch Investment Partners, Inc. | 650,757 | $66.3M | 0.36% | −32,855−4.8% | Reduced |
| Welch & Forbes LLC | 658,992 | $67.2M | 0.81% | −9,946−1.5% | Reduced |
| LPL Financial LLC | 709,400 | $72.3M | 0.02% | +35,804+5.3% | Added |
| CIBC Private Wealth Group, LLC | 721,087 | $73.5M | 0.13% | −12,162−1.7% | Reduced |
| Barclays PLC | 739,890 | $75.4M | 0.03% | +196,194+36.1% | Added |
| Captrust Financial Advisors | 768,266 | $78.3M | 0.16% | −915−0.1% | Reduced |
| Mitsubishi UFJ Kokusai Asset Management Co., Ltd. | 802,312 | $81.8M | 0.06% | +35,724+4.7% | Added |
| Swiss National Bank | 850,561 | $86.7M | 0.05% | −38,700−4.4% | Reduced |
| SEI Investments Co | 872,870 | $89.0M | 0.10% | −12,210−1.4% | Reduced |
| Sumitomo Mitsui Trust Holdings, Inc. | 934,752 | $95.3M | 0.05% | +10,338+1.1% | Added |
| HSBC Holdings PLC | 951,576 | $96.9M | 0.06% | +167,280+21.3% | Added |
| Vontobel Holding Ltd. | 1,078,487 | $109.9M | 0.35% | +1,078,487 | New |
| DekaBank Deutsche Girozentrale | 1,122,500 | $112.3M | 0.19% | 00.0% | Unchanged |
| Amundi | 1,085,307 | $115.4M | 0.04% | −515,511−32.2% | Reduced |
| Bank of America Corp | 1,227,950 | $125.2M | 0.01% | −21,492−1.7% | Reduced |
| Cbre Clarion Securities LLC | 1,269,467 | $129.4M | 1.85% | +196,369+18.3% | Added |
| Point72 Asset Management, L.P. | 1,296,531 | $132.2M | 0.29% | +282,152+27.8% | Added |
| Goldman Sachs Group Inc | 1,354,097 | $138.0M | 0.02% | −525,874−28.0% | Reduced |
| UBS Group AG | 1,436,301 | $146.4M | 0.03% | −363,926−20.2% | Reduced |
| Duff & Phelps Investment Management Co | 1,642,074 | $167.4M | 1.90% | +169,495+11.5% | Added |
| Bank of New York Mellon Corp | 1,666,560 | $169.9M | 0.03% | −80,916−4.6% | Reduced |
| PGGM Investments | 1,684,781 | $171.7M | 2.78% | +118,989+7.6% | Added |
| Ameriprise Financial Inc | 1,706,032 | $173.8M | 0.04% | +2080.0% | Added |
| Russell Investments Group, Ltd. | 1,706,435 | $173.9M | 0.20% | −117,229−6.4% | Reduced |
| JPMorgan Chase & Co | 2,056,448 | $209.6M | 0.01% | +83,450+4.2% | Added |
| Prudential Financial Inc | 2,113,617 | $215.5M | 0.26% | +167,848+8.6% | Added |
| Capital World Investors | 2,117,169 | $215.8M | 0.03% | 00.0% | Unchanged |
| Nuveen, LLC | 2,142,505 | $218.4M | 0.06% | +87,716+4.3% | Added |
| Royal Bank of Canada | 2,298,983 | $234.4M | 0.04% | +256,188+12.5% | Added |
| Pictet Asset Management Holding SA | 2,464,168 | $251.1M | 0.24% | −11,503−0.5% | Reduced |
| Centersquare Investment Management LLC | 2,514,464 | $256.3M | 2.58% | +483,548+23.8% | Added |