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, 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 |
|---|---|---|---|---|---|
| Intrinsic Edge Capital Management LLC | 179,473 | $14.9M | 2.89% | +30,102+20.2% | Added |
| Manufacturers Life Insurance Company, The | 179,876 | $14.9M | 0.01% | −562−0.3% | Reduced |
| TD Asset Management Inc | 180,420 | $15.0M | 0.01% | +4,090+2.3% | Added |
| New York State Common Retirement Fund | 184,074 | $15.3M | 0.02% | +2,000+1.1% | Added |
| Public Employees Retirement System of Ohio | 191,507 | $15.9M | 0.05% | +99,851+108.9% | Added |
| Moran Wealth Management, LLC | 195,140 | $16.2M | 0.50% | −7,648−3.8% | Reduced |
| Victory Capital Management Inc | 199,036 | $16.5M | 0.01% | −23,898−10.7% | Reduced |
| Andra AP-fonden | 201,300 | $16.7M | 0.21% | −14,400−6.7% | Reduced |
| Cander Asset Management LP | 202,738 | $16.8M | 3.11% | +202,738 | New |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 205,361 | $17.0M | 0.04% | +1,959+1.0% | Added |
| Balyasny Asset Management LLC | 206,809 | $17.2M | 0.03% | +57,880+38.9% | Added |
| CIBC World Markets Inc. | 208,036 | $17.3M | 0.03% | +35,586+20.6% | Added |
| Verition Fund Management LLC | 208,951 | $17.3M | 0.09% | +181,051+648.9% | Added |
| Schonfeld Strategic Advisors LLC | 209,300 | $17.4M | 0.09% | +111,071+113.1% | Added |
| CI Private Wealth, LLC | 211,327 | $17.5M | 0.02% | +8,803+4.3% | Added |
| Regions Financial Corp | 214,642 | $17.8M | 0.11% | −37,139−14.8% | Reduced |
| Colony Group, LLC | 217,915 | $18.3M | 0.02% | +88,319+68.1% | Added |
| Pacer Advisors, Inc. | 223,367 | $18.5M | 0.05% | −7,868−3.4% | Reduced |
| Stifel Financial Corp | 227,234 | $18.8M | 0.02% | +9,097+4.2% | Added |
| New York State Teachers Retirement System | 227,876 | $18.9M | 0.04% | +60.0% | Added |
| Retirement Systems of Alabama | 228,071 | $18.9M | 0.06% | −2,868−1.2% | Reduced |
| Brookstone Capital Management | 235,933 | $19.6M | 0.22% | +28,490+13.7% | Added |
| Blair William & Co | 238,285 | $19.8M | 0.05% | −80,125−25.2% | Reduced |
| Americana Partners, LLC | 241,349 | $20.0M | 0.55% | +241,349 | New |
| Cetera Investment Advisers | 248,597 | $20.6M | 0.02% | −5,755−2.3% | Reduced |
| Captrust Financial Advisors | 255,142 | $21.2M | 0.04% | −513,124−66.8% | Reduced |
| Aviva PLC | 256,125 | $21.2M | 0.04% | +13,676+5.6% | Added |
| State Board of Administration of Florida Retirement System | 262,515 | $21.8M | 0.04% | −8,242−3.0% | Reduced |
| Apollo Management Holdings, L.P. | 265,539 | $22.0M | 0.22% | +265,539 | New |
| Swedbank AB | 284,858 | $23.6M | 0.02% | 00.0% | Unchanged |
| Two Sigma Investments, LP | 290,160 | $24.1M | 0.04% | +290,160 | New |
| Macquarie Group Ltd | 292,992 | $24.3M | 0.11% | +6,408+2.2% | Added |
| Marble Harbor Investment Counsel, LLC | 314,020 | $26.0M | 2.78% | −11,240−3.5% | Reduced |
| Adell Harriman & Carpenter Inc | 314,617 | $26.1M | 1.56% | −11,698−3.6% | Reduced |
| Citigroup Inc | 318,601 | $26.4M | 0.02% | −101,122−24.1% | Reduced |
| Teacher Retirement System of Texas | 333,971 | $27.7M | 0.10% | +295,333+764.4% | Added |
| Great West Life Assurance Co | 336,935 | $27.9M | 0.05% | −108,129−24.3% | Reduced |
| Adelante Capital Management LLC | 339,227 | $28.1M | 1.96% | −47,058−12.2% | Reduced |
| Standard Life Aberdeen plc | 364,889 | $30.3M | 0.05% | −17,745−4.6% | Reduced |
| Raymond James Financial Inc | 366,309 | $30.4M | 0.01% | −14,039−3.7% | Reduced |
| American Century Companies Inc | 395,893 | $32.8M | 0.02% | −156,156−28.3% | Reduced |
| Rockefeller Capital Management L.P. | 403,992 | $33.6M | 0.06% | −3,463−0.8% | Reduced |
| STRS Ohio | 414,128 | $34.4M | 0.13% | +156,613+60.8% | Added |
| Neuberger Berman Group LLC | 431,386 | $35.8M | 0.03% | +15,138+3.6% | Added |
| California State Teachers Retirement System | 434,105 | $36.0M | 0.04% | −6,452−1.5% | Reduced |
| Bank of Montreal | 436,345 | $36.2M | 0.01% | +38,165+9.6% | Added |
| Millennium Management LLC | 489,014 | $40.6M | 0.03% | +3,597+0.7% | Added |
| Heitman Real Estate Securities LLC | 490,548 | $40.7M | 2.86% | +16,180+3.4% | Added |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main | 495,760 | $41.1M | 0.04% | −19,246−3.7% | Reduced |
| Border to Coast Pensions Partnership Ltd | 500,000 | $41.6M | 0.72% | +20,000+4.2% | Added |
| National Pension Service | 509,020 | $42.2M | 0.03% | +13,540+2.7% | Added |
| California Public Employees Retirement System | 513,555 | $42.6M | 0.02% | +1400.0% | Added |
| Nomura Asset Management Co Ltd | 544,483 | $45.2M | 0.11% | +15,435+2.9% | Added |
| Alliancebernstein L.P. | 544,810 | $45.2M | 0.01% | −11,184−2.0% | Reduced |
| Asset Management One Co.,Ltd. | 555,974 | $45.9M | 0.13% | +4,260+0.8% | Added |
| BNP Paribas Arbitrage, SA | 562,253 | $46.6M | 0.03% | +35,983+6.8% | Added |
| APG Asset Management US Inc. | 582,174 | $48.3M | 0.38% | 00.0% | Unchanged |
| Rhumbline Advisers | 590,540 | $49.0M | 0.04% | −6,097−1.0% | Reduced |
| Price T Rowe Associates Inc | 606,859 | $50.3M | 0.01% | +11,264+1.9% | Added |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 625,444 | $52.0M | 0.08% | +127,724+25.7% | Added |
| Epoch Investment Partners, Inc. | 629,854 | $52.2M | 0.30% | −20,903−3.2% | Reduced |
| LPL Financial LLC | 634,799 | $52.7M | 0.01% | −74,601−10.5% | Reduced |
| Wells Fargo & Company | 637,272 | $52.9M | 0.01% | −568−0.1% | Reduced |
| Welch & Forbes LLC | 656,364 | $54.4M | 0.66% | −2,628−0.4% | Reduced |
| Adage Capital Partners GP, L.L.C. | 656,852 | $54.5M | 0.08% | +103,432+18.7% | Added |
| CIBC Private Wealth Group, LLC | 677,651 | $56.2M | 0.10% | −43,436−6.0% | Reduced |
| Barclays PLC | 728,857 | $60.5M | 0.02% | −11,033−1.5% | Reduced |
| Point72 Asset Management, L.P. | 790,504 | $65.6M | 0.10% | −506,027−39.0% | Reduced |
| UBS Group AG | 795,908 | $66.0M | 0.01% | −640,393−44.6% | Reduced |
| Swiss National Bank | 809,261 | $67.1M | 0.04% | −41,300−4.9% | Reduced |
| Mitsubishi UFJ Kokusai Asset Management Co., Ltd. | 839,566 | $69.9M | 0.05% | +37,254+4.6% | Added |
| Sumitomo Mitsui Trust Holdings, Inc. | 906,888 | $75.2M | 0.04% | −27,864−3.0% | Reduced |
| AQR Capital Management LLC | 923,196 | $76.6M | 0.04% | +465,724+101.8% | Added |
| SEI Investments Co | 1,024,664 | $85.0M | 0.08% | +151,794+17.4% | Added |
| HSBC Holdings PLC | 1,055,775 | $87.6M | 0.05% | +104,199+11.0% | Added |
| Citadel Advisors LLC | 1,119,371 | $92.9M | 0.06% | +1,058,080+1,726.3% | Added |
| DekaBank Deutsche Girozentrale | 1,122,500 | $95.8M | 0.18% | 00.0% | Unchanged |
| Royal Bank of Canada | 1,285,871 | $106.7M | 0.02% | −1,013,112−44.1% | Reduced |
| Amundi | 1,333,693 | $110.6M | 0.03% | +248,386+22.9% | Added |
| Russell Investments Group, Ltd. | 1,405,760 | $116.6M | 0.13% | −300,675−17.6% | Reduced |
| Cbre Clarion Securities LLC | 1,446,597 | $120.0M | 1.76% | +177,130+14.0% | Added |
| Bank of America Corp | 1,510,345 | $125.3M | 0.01% | +282,395+23.0% | Added |
| Goldman Sachs Group Inc | 1,525,240 | $126.5M | 0.02% | +171,143+12.6% | Added |
| Duff & Phelps Investment Management Co | 1,580,452 | $131.1M | 1.49% | −61,622−3.8% | Reduced |
| PGGM Investments | 1,657,159 | $137.5M | 2.18% | −27,622−1.6% | Reduced |
| Bank of New York Mellon Corp | 1,685,978 | $139.9M | 0.02% | +19,418+1.2% | Added |
| Vontobel Holding Ltd. | 1,689,246 | $140.1M | 0.46% | +610,759+56.6% | Added |
| Ameriprise Financial Inc | 1,744,405 | $142.5M | 0.03% | +38,373+2.2% | Added |
| JPMorgan Chase & Co | 1,927,935 | $159.9M | 0.01% | −128,513−6.2% | Reduced |
| Capital World Investors | 2,117,169 | $175.6M | 0.02% | 00.0% | Unchanged |
| Nuveen, LLC | 2,127,931 | $176.5M | 0.05% | −14,574−0.7% | Reduced |
| Pictet Asset Management Holding SA | 2,295,965 | $190.4M | 0.18% | −168,203−6.8% | Reduced |
| Prudential Financial Inc | 2,310,481 | $191.7M | 0.23% | +196,864+9.3% | Added |
| Deutsche Bank AG | 2,541,992 | $210.9M | 0.07% | −348,459−12.1% | Reduced |
| Centersquare Investment Management LLC | 2,631,453 | $218.3M | 2.15% | +116,989+4.7% | Added |
| Contour Asset Management LLC | 2,832,182 | $234.9M | 5.48% | −333,648−10.5% | Reduced |
| Legal & General Group Plc | 3,356,420 | $278.4M | 0.06% | +140,965+4.4% | Added |
| Morgan Stanley | 3,598,973 | $298.5M | 0.02% | −12,426−0.3% | Reduced |
| Daiwa Securities Group Inc. | 3,654,086 | $303.1M | 0.98% | +502,998+16.0% | Added |
| Charles Schwab Investment Management Inc | 3,880,275 | $321.9M | 0.05% | +206,030+5.6% | Added |