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, Q4 2025
Institutional positions in Iron Mountain Inc as of Dec 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
- 1,011
- +16 vs. Q3 2025
- Shares held
- 257.3M
- +7.46M (+3.0%) vs. Q3 2025
- Total value
- $21.4B
- −$4.12B (−16.2%) vs. Q3 2025
- New holders
- 123
- 326 more added
- Sold out
- 107
- 407 more reduced
22 institutions that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q3 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, Q4 2025
Shares, value and share of portfolio for each institution holding Iron Mountain Inc; share changes are against Q3 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Vanguard Group Inc | 46,627,483 | $3.87B | 0.06% | −625,617−1.3% | Reduced |
| BlackRock, Inc. | 32,919,658 | $2.73B | 0.05% | +1,210,594+3.8% | Added |
| Cohen & Steers, Inc. | 18,903,716 | $1.57B | 2.83% | +3,155,034+20.0% | Added |
| State Street Corp | 16,888,798 | $1.42B | 0.05% | −242,989−1.4% | Reduced |
| Geode Capital Management, LLC | 8,292,653 | $685.4M | 0.04% | +102,073+1.2% | Added |
| FMR LLC | 7,984,304 | $662.3M | 0.03% | +126,212+1.6% | Added |
| Norges Bank | 4,447,133 | $368.9M | 0.04% | +4,447,133 | New |
| Dimensional Fund Advisors LP | 4,429,359 | $367.4M | 0.08% | +81,320+1.9% | Added |
| Invesco Ltd. | 4,417,367 | $366.4M | 0.03% | −649,149−12.8% | Reduced |
| Principal Financial Group Inc | 4,207,596 | $349.0M | 0.18% | +1,680,438+66.5% | Added |
| Northern Trust Corp | 4,152,569 | $344.5M | 0.04% | +121,003+3.0% | Added |
| Charles Schwab Investment Management Inc | 3,880,275 | $321.9M | 0.05% | +206,030+5.6% | Added |
| Daiwa Securities Group Inc. | 3,654,086 | $303.1M | 0.98% | +502,998+16.0% | Added |
| Morgan Stanley | 3,598,973 | $298.5M | 0.02% | −12,426−0.3% | Reduced |
| Legal & General Group Plc | 3,356,420 | $278.4M | 0.06% | +140,965+4.4% | Added |
| Contour Asset Management LLC | 2,832,182 | $234.9M | 5.48% | −333,648−10.5% | Reduced |
| Centersquare Investment Management LLC | 2,631,453 | $218.3M | 2.15% | +116,989+4.7% | Added |
| Deutsche Bank AG | 2,541,992 | $210.9M | 0.07% | −348,459−12.1% | Reduced |
| Prudential Financial Inc | 2,310,481 | $191.7M | 0.23% | +196,864+9.3% | Added |
| Pictet Asset Management Holding SA | 2,295,965 | $190.4M | 0.18% | −168,203−6.8% | Reduced |
| Nuveen, LLC | 2,127,931 | $176.5M | 0.05% | −14,574−0.7% | Reduced |
| Capital World Investors | 2,117,169 | $175.6M | 0.02% | 00.0% | Unchanged |
| JPMorgan Chase & Co | 1,927,935 | $159.9M | 0.01% | −128,513−6.2% | Reduced |
| Ameriprise Financial Inc | 1,744,405 | $142.5M | 0.03% | +38,373+2.2% | Added |
| Vontobel Holding Ltd. | 1,689,246 | $140.1M | 0.46% | +610,759+56.6% | Added |
| Bank of New York Mellon Corp | 1,685,978 | $139.9M | 0.02% | +19,418+1.2% | Added |
| PGGM Investments | 1,657,159 | $137.5M | 2.18% | −27,622−1.6% | Reduced |
| Duff & Phelps Investment Management Co | 1,580,452 | $131.1M | 1.49% | −61,622−3.8% | Reduced |
| Goldman Sachs Group Inc | 1,525,240 | $126.5M | 0.02% | +171,143+12.6% | Added |
| Bank of America Corp | 1,510,345 | $125.3M | 0.01% | +282,395+23.0% | Added |
| Cbre Clarion Securities LLC | 1,446,597 | $120.0M | 1.76% | +177,130+14.0% | Added |
| Russell Investments Group, Ltd. | 1,405,760 | $116.6M | 0.13% | −300,675−17.6% | Reduced |
| Amundi | 1,333,693 | $110.6M | 0.03% | +248,386+22.9% | Added |
| Royal Bank of Canada | 1,285,871 | $106.7M | 0.02% | −1,013,112−44.1% | Reduced |
| DekaBank Deutsche Girozentrale | 1,122,500 | $95.8M | 0.18% | 00.0% | Unchanged |
| Citadel Advisors LLC | 1,119,371 | $92.9M | 0.06% | +1,058,080+1,726.3% | Added |
| HSBC Holdings PLC | 1,055,775 | $87.6M | 0.05% | +104,199+11.0% | Added |
| SEI Investments Co | 1,024,664 | $85.0M | 0.08% | +151,794+17.4% | Added |
| AQR Capital Management LLC | 923,196 | $76.6M | 0.04% | +465,724+101.8% | Added |
| Sumitomo Mitsui Trust Holdings, Inc. | 906,888 | $75.2M | 0.04% | −27,864−3.0% | Reduced |
| Mitsubishi UFJ Kokusai Asset Management Co., Ltd. | 839,566 | $69.9M | 0.05% | +37,254+4.6% | Added |
| Swiss National Bank | 809,261 | $67.1M | 0.04% | −41,300−4.9% | Reduced |
| UBS Group AG | 795,908 | $66.0M | 0.01% | −640,393−44.6% | Reduced |
| Point72 Asset Management, L.P. | 790,504 | $65.6M | 0.10% | −506,027−39.0% | Reduced |
| Barclays PLC | 728,857 | $60.5M | 0.02% | −11,033−1.5% | Reduced |
| CIBC Private Wealth Group, LLC | 677,651 | $56.2M | 0.10% | −43,436−6.0% | Reduced |
| Adage Capital Partners GP, L.L.C. | 656,852 | $54.5M | 0.08% | +103,432+18.7% | Added |
| Welch & Forbes LLC | 656,364 | $54.4M | 0.66% | −2,628−0.4% | Reduced |
| Wells Fargo & Company | 637,272 | $52.9M | 0.01% | −568−0.1% | Reduced |
| LPL Financial LLC | 634,799 | $52.7M | 0.01% | −74,601−10.5% | Reduced |
| Epoch Investment Partners, Inc. | 629,854 | $52.2M | 0.30% | −20,903−3.2% | Reduced |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 625,444 | $52.0M | 0.08% | +127,724+25.7% | Added |
| Price T Rowe Associates Inc | 606,859 | $50.3M | 0.01% | +11,264+1.9% | Added |
| Rhumbline Advisers | 590,540 | $49.0M | 0.04% | −6,097−1.0% | Reduced |
| APG Asset Management US Inc. | 582,174 | $48.3M | 0.38% | 00.0% | Unchanged |
| BNP Paribas Arbitrage, SA | 562,253 | $46.6M | 0.03% | +35,983+6.8% | Added |
| Asset Management One Co.,Ltd. | 555,974 | $45.9M | 0.13% | +4,260+0.8% | Added |
| Alliancebernstein L.P. | 544,810 | $45.2M | 0.01% | −11,184−2.0% | Reduced |
| Nomura Asset Management Co Ltd | 544,483 | $45.2M | 0.11% | +15,435+2.9% | Added |
| California Public Employees Retirement System | 513,555 | $42.6M | 0.02% | +1400.0% | Added |
| National Pension Service | 509,020 | $42.2M | 0.03% | +13,540+2.7% | Added |
| Border to Coast Pensions Partnership Ltd | 500,000 | $41.6M | 0.72% | +20,000+4.2% | Added |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main | 495,760 | $41.1M | 0.04% | −19,246−3.7% | Reduced |
| Heitman Real Estate Securities LLC | 490,548 | $40.7M | 2.86% | +16,180+3.4% | Added |
| Millennium Management LLC | 489,014 | $40.6M | 0.03% | +3,597+0.7% | Added |
| Bank of Montreal | 436,345 | $36.2M | 0.01% | +38,165+9.6% | Added |
| California State Teachers Retirement System | 434,105 | $36.0M | 0.04% | −6,452−1.5% | Reduced |
| Neuberger Berman Group LLC | 431,386 | $35.8M | 0.03% | +15,138+3.6% | Added |
| STRS Ohio | 414,128 | $34.4M | 0.13% | +156,613+60.8% | Added |
| Rockefeller Capital Management L.P. | 403,992 | $33.6M | 0.06% | −3,463−0.8% | Reduced |
| American Century Companies Inc | 395,893 | $32.8M | 0.02% | −156,156−28.3% | Reduced |
| Raymond James Financial Inc | 366,309 | $30.4M | 0.01% | −14,039−3.7% | Reduced |
| Standard Life Aberdeen plc | 364,889 | $30.3M | 0.05% | −17,745−4.6% | Reduced |
| Adelante Capital Management LLC | 339,227 | $28.1M | 1.96% | −47,058−12.2% | Reduced |
| Great West Life Assurance Co | 336,935 | $27.9M | 0.05% | −108,129−24.3% | Reduced |
| Teacher Retirement System of Texas | 333,971 | $27.7M | 0.10% | +295,333+764.4% | Added |
| Citigroup Inc | 318,601 | $26.4M | 0.02% | −101,122−24.1% | Reduced |
| Adell Harriman & Carpenter Inc | 314,617 | $26.1M | 1.56% | −11,698−3.6% | Reduced |
| Marble Harbor Investment Counsel, LLC | 314,020 | $26.0M | 2.78% | −11,240−3.5% | Reduced |
| Macquarie Group Ltd | 292,992 | $24.3M | 0.11% | +6,408+2.2% | Added |
| Two Sigma Investments, LP | 290,160 | $24.1M | 0.04% | +290,160 | New |
| Swedbank AB | 284,858 | $23.6M | 0.02% | 00.0% | Unchanged |
| Apollo Management Holdings, L.P. | 265,539 | $22.0M | 0.22% | +265,539 | New |
| State Board of Administration of Florida Retirement System | 262,515 | $21.8M | 0.04% | −8,242−3.0% | Reduced |
| Aviva PLC | 256,125 | $21.2M | 0.04% | +13,676+5.6% | Added |
| Captrust Financial Advisors | 255,142 | $21.2M | 0.04% | −513,124−66.8% | Reduced |
| Cetera Investment Advisers | 248,597 | $20.6M | 0.02% | −5,755−2.3% | Reduced |
| Americana Partners, LLC | 241,349 | $20.0M | 0.55% | +241,349 | New |
| Blair William & Co | 238,285 | $19.8M | 0.05% | −80,125−25.2% | Reduced |
| Brookstone Capital Management | 235,933 | $19.6M | 0.22% | +28,490+13.7% | Added |
| Retirement Systems of Alabama | 228,071 | $18.9M | 0.06% | −2,868−1.2% | Reduced |
| New York State Teachers Retirement System | 227,876 | $18.9M | 0.04% | +60.0% | Added |
| Stifel Financial Corp | 227,234 | $18.8M | 0.02% | +9,097+4.2% | Added |
| Pacer Advisors, Inc. | 223,367 | $18.5M | 0.05% | −7,868−3.4% | Reduced |
| Colony Group, LLC | 217,915 | $18.3M | 0.02% | +88,319+68.1% | Added |
| Regions Financial Corp | 214,642 | $17.8M | 0.11% | −37,139−14.8% | Reduced |
| CI Private Wealth, LLC | 211,327 | $17.5M | 0.02% | +8,803+4.3% | Added |
| Schonfeld Strategic Advisors LLC | 209,300 | $17.4M | 0.09% | +111,071+113.1% | Added |
| Verition Fund Management LLC | 208,951 | $17.3M | 0.09% | +181,051+648.9% | Added |
| CIBC World Markets Inc. | 208,036 | $17.3M | 0.03% | +35,586+20.6% | Added |