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, 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 |
|---|---|---|---|---|---|
| Vanguard Group Inc | 47,253,100 | $4.82B | 0.07% | +188,213+0.4% | Added |
| BlackRock, Inc. | 31,709,064 | $3.23B | 0.06% | +430,437+1.4% | Added |
| State Street Corp | 17,131,787 | $1.76B | 0.06% | +322,144+1.9% | Added |
| Cohen & Steers, Inc. | 15,748,682 | $1.61B | 2.90% | +1,980,051+14.4% | Added |
| Geode Capital Management, LLC | 8,190,580 | $831.7M | 0.05% | +103,862+1.3% | Added |
| FMR LLC | 7,858,092 | $801.1M | 0.04% | +1,160,673+17.3% | Added |
| Invesco Ltd. | 5,066,516 | $516.5M | 0.08% | +776,933+18.1% | Added |
| Dimensional Fund Advisors LP | 4,348,039 | $443.2M | 0.10% | +55,273+1.3% | Added |
| Northern Trust Corp | 4,031,566 | $411.0M | 0.05% | −36,242−0.9% | Reduced |
| Charles Schwab Investment Management Inc | 3,674,245 | $374.6M | 0.06% | +48,437+1.3% | Added |
| Morgan Stanley | 3,611,399 | $368.1M | 0.02% | +104,916+3.0% | Added |
| Legal & General Group Plc | 3,215,455 | $327.8M | 0.07% | −67,821−2.1% | Reduced |
| Contour Asset Management LLC | 3,165,830 | $322.7M | 8.09% | +830,482+35.6% | Added |
| UBS Asset Management Americas Inc | 3,161,589 | $322.3M | 0.07% | +2,708,560+597.9% | Added |
| Daiwa Securities Group Inc. | 3,151,088 | $321.2M | 1.08% | +196,161+6.6% | Added |
| Deutsche Bank AG | 2,890,451 | $294.7M | 0.10% | −539,030−15.7% | Reduced |
| Principal Financial Group Inc | 2,527,158 | $257.6M | 0.13% | −57,698−2.2% | Reduced |
| Centersquare Investment Management LLC | 2,514,464 | $256.3M | 2.58% | +483,548+23.8% | Added |
| Pictet Asset Management Holding SA | 2,464,168 | $251.1M | 0.24% | −11,503−0.5% | Reduced |
| Royal Bank of Canada | 2,298,983 | $234.4M | 0.04% | +256,188+12.5% | Added |
| Nuveen, LLC | 2,142,505 | $218.4M | 0.06% | +87,716+4.3% | Added |
| Capital World Investors | 2,117,169 | $215.8M | 0.03% | 00.0% | Unchanged |
| Prudential Financial Inc | 2,113,617 | $215.5M | 0.26% | +167,848+8.6% | Added |
| JPMorgan Chase & Co | 2,056,448 | $209.6M | 0.01% | +83,450+4.2% | Added |
| Russell Investments Group, Ltd. | 1,706,435 | $173.9M | 0.20% | −117,229−6.4% | Reduced |
| Ameriprise Financial Inc | 1,706,032 | $173.8M | 0.04% | +2080.0% | Added |
| PGGM Investments | 1,684,781 | $171.7M | 2.78% | +118,989+7.6% | Added |
| Bank of New York Mellon Corp | 1,666,560 | $169.9M | 0.03% | −80,916−4.6% | Reduced |
| Duff & Phelps Investment Management Co | 1,642,074 | $167.4M | 1.90% | +169,495+11.5% | Added |
| UBS Group AG | 1,436,301 | $146.4M | 0.03% | −363,926−20.2% | Reduced |
| Goldman Sachs Group Inc | 1,354,097 | $138.0M | 0.02% | −525,874−28.0% | Reduced |
| Point72 Asset Management, L.P. | 1,296,531 | $132.2M | 0.29% | +282,152+27.8% | Added |
| Cbre Clarion Securities LLC | 1,269,467 | $129.4M | 1.85% | +196,369+18.3% | Added |
| Bank of America Corp | 1,227,950 | $125.2M | 0.01% | −21,492−1.7% | Reduced |
| Amundi | 1,085,307 | $115.4M | 0.04% | −515,511−32.2% | Reduced |
| DekaBank Deutsche Girozentrale | 1,122,500 | $112.3M | 0.19% | 00.0% | Unchanged |
| Vontobel Holding Ltd. | 1,078,487 | $109.9M | 0.35% | +1,078,487 | New |
| HSBC Holdings PLC | 951,576 | $96.9M | 0.06% | +167,280+21.3% | Added |
| Sumitomo Mitsui Trust Holdings, Inc. | 934,752 | $95.3M | 0.05% | +10,338+1.1% | Added |
| SEI Investments Co | 872,870 | $89.0M | 0.10% | −12,210−1.4% | Reduced |
| Swiss National Bank | 850,561 | $86.7M | 0.05% | −38,700−4.4% | Reduced |
| Mitsubishi UFJ Kokusai Asset Management Co., Ltd. | 802,312 | $81.8M | 0.06% | +35,724+4.7% | Added |
| Captrust Financial Advisors | 768,266 | $78.3M | 0.16% | −915−0.1% | Reduced |
| Barclays PLC | 739,890 | $75.4M | 0.03% | +196,194+36.1% | Added |
| CIBC Private Wealth Group, LLC | 721,087 | $73.5M | 0.13% | −12,162−1.7% | Reduced |
| LPL Financial LLC | 709,400 | $72.3M | 0.02% | +35,804+5.3% | Added |
| Welch & Forbes LLC | 658,992 | $67.2M | 0.81% | −9,946−1.5% | Reduced |
| Epoch Investment Partners, Inc. | 650,757 | $66.3M | 0.36% | −32,855−4.8% | Reduced |
| Wells Fargo & Company | 637,840 | $65.0M | 0.01% | +12,363+2.0% | Added |
| Rhumbline Advisers | 596,637 | $60.8M | 0.05% | −23,257−3.8% | Reduced |
| Price T Rowe Associates Inc | 595,595 | $60.7M | 0.01% | −31,445−5.0% | Reduced |
| APG Asset Management US Inc. | 582,174 | $59.5M | 0.44% | 00.0% | Unchanged |
| Alliancebernstein L.P. | 555,994 | $56.7M | 0.02% | −5,292−0.9% | Reduced |
| Adage Capital Partners GP, L.L.C. | 553,420 | $56.4M | 0.09% | −6,832−1.2% | Reduced |
| American Century Companies Inc | 552,049 | $56.3M | 0.03% | −193,217−25.9% | Reduced |
| Asset Management One Co.,Ltd. | 551,714 | $56.2M | 0.16% | −4,236−0.8% | Reduced |
| Nomura Asset Management Co Ltd | 529,048 | $53.9M | 0.14% | +11,330+2.2% | Added |
| BNP Paribas Arbitrage, SA | 526,270 | $53.6M | 0.04% | +99,645+23.4% | Added |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main | 515,006 | $52.5M | 0.05% | +137,199+36.3% | Added |
| California Public Employees Retirement System | 513,415 | $52.3M | 0.03% | +19,530+4.0% | Added |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 497,720 | $50.7M | 0.08% | +19,540+4.1% | Added |
| National Pension Service | 495,480 | $50.5M | 0.04% | +19,319+4.1% | Added |
| Millennium Management LLC | 485,417 | $49.5M | 0.04% | −90,552−15.7% | Reduced |
| Border to Coast Pensions Partnership Ltd | 480,000 | $48.9M | 0.85% | 00.0% | Unchanged |
| Heitman Real Estate Securities LLC | 474,368 | $48.4M | 3.30% | +10,850+2.3% | Added |
| AQR Capital Management LLC | 457,472 | $46.4M | 0.03% | +351,463+331.5% | Added |
| California State Teachers Retirement System | 440,557 | $44.9M | 0.05% | −11,644−2.6% | Reduced |
| Great West Life Assurance Co | 445,064 | $44.7M | 0.06% | +7,410+1.7% | Added |
| Bamco Inc | 436,831 | $44.5M | 0.12% | +329,307+306.3% | Added |
| Citigroup Inc | 419,723 | $42.8M | 0.03% | +215,308+105.3% | Added |
| Neuberger Berman Group LLC | 416,248 | $42.4M | 0.03% | +51,622+14.2% | Added |
| Rockefeller Capital Management L.P. | 407,455 | $41.6M | 0.08% | +28,566+7.5% | Added |
| Bank of Montreal | 398,180 | $40.6M | 0.02% | +31,746+8.7% | Added |
| Adelante Capital Management LLC | 386,285 | $39.4M | 2.72% | −16,920−4.2% | Reduced |
| Raymond James Financial Inc | 380,348 | $38.8M | 0.01% | −12,594−3.2% | Reduced |
| Standard Life Aberdeen plc | 382,634 | $38.4M | 0.06% | +42,971+12.7% | Added |
| Adell Harriman & Carpenter Inc | 326,315 | $33.3M | 2.02% | +2,015+0.6% | Added |
| Marble Harbor Investment Counsel, LLC | 325,260 | $33.2M | 3.47% | −3,513−1.1% | Reduced |
| Blair William & Co | 318,410 | $32.5M | 0.09% | +4,280+1.4% | Added |
| Aew Capital Management L P | 315,257 | $32.1M | 1.79% | −304,420−49.1% | Reduced |
| KBC Group NV | 292,478 | $29.8M | 0.07% | +226,790+345.3% | Added |
| Gillson Capital LP | 286,900 | $29.2M | 2.54% | −82,237−22.3% | Reduced |
| Macquarie Group Ltd | 286,584 | $29.2M | 0.03% | −2,400−0.8% | Reduced |
| Swedbank AB | 284,858 | $29.0M | 0.03% | −30,202−9.6% | Reduced |
| State Board of Administration of Florida Retirement System | 270,757 | $27.6M | 0.05% | −25,229−8.5% | Reduced |
| STRS Ohio | 257,515 | $26.3M | 0.10% | +32,903+14.6% | Added |
| Cetera Investment Advisers | 254,352 | $25.9M | 0.03% | +84,900+50.1% | Added |
| Regions Financial Corp | 251,781 | $25.7M | 0.17% | +3,495+1.4% | Added |
| Wellington Management Group LLP | 248,892 | $25.4M | 0.00% | −1,245,031−83.3% | Reduced |
| Aviva PLC | 242,449 | $24.7M | 0.04% | +14,210+6.2% | Added |
| Pacer Advisors, Inc. | 231,235 | $23.6M | 0.06% | +10,952+5.0% | Added |
| Retirement Systems of Alabama | 230,939 | $23.5M | 0.08% | −306−0.1% | Reduced |
| Worldquant Millennium Advisors LLC | 230,912 | $23.5M | 0.10% | −37,245−13.9% | Reduced |
| New York State Teachers Retirement System | 227,870 | $23.2M | 0.05% | −550.0% | Reduced |
| Victory Capital Management Inc | 222,934 | $22.7M | 0.01% | −9,020−3.9% | Reduced |
| Stifel Financial Corp | 218,137 | $22.2M | 0.02% | +2,901+1.3% | Added |
| Andra AP-fonden | 215,700 | $22.0M | 0.28% | −30,200−12.3% | Reduced |
| Canada Pension Plan Investment Board | 210,283 | $21.4M | 0.02% | +102,327+94.8% | Added |
| Brookstone Capital Management | 207,443 | $21.1M | 0.25% | +59,383+40.1% | Added |
| National Bank of Canada | 203,663 | $20.8M | 0.02% | −23,726−10.4% | Reduced |