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 |
|---|---|---|---|---|---|
| Balyasny Asset Management LLC | 206,809 | $17.2M | 0.03% | +57,880+38.9% | Added |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 205,361 | $17.0M | 0.04% | +1,959+1.0% | Added |
| Cander Asset Management LP | 202,738 | $16.8M | 3.11% | +202,738 | New |
| Andra AP-fonden | 201,300 | $16.7M | 0.21% | −14,400−6.7% | Reduced |
| Victory Capital Management Inc | 199,036 | $16.5M | 0.01% | −23,898−10.7% | Reduced |
| Moran Wealth Management, LLC | 195,140 | $16.2M | 0.50% | −7,648−3.8% | Reduced |
| Public Employees Retirement System of Ohio | 191,507 | $15.9M | 0.05% | +99,851+108.9% | Added |
| New York State Common Retirement Fund | 184,074 | $15.3M | 0.02% | +2,000+1.1% | Added |
| TD Asset Management Inc | 180,420 | $15.0M | 0.01% | +4,090+2.3% | Added |
| Manufacturers Life Insurance Company, The | 179,876 | $14.9M | 0.01% | −562−0.3% | Reduced |
| Intrinsic Edge Capital Management LLC | 179,473 | $14.9M | 2.89% | +30,102+20.2% | Added |
| State of Alaska, Department of Revenue | 174,179 | $14.4M | 0.15% | −1,115−0.6% | Reduced |
| Toronto Dominion Bank | 173,306 | $14.4M | 0.03% | −3,701−2.1% | Reduced |
| State of Wisconsin Investment Board | 173,137 | $14.4M | 0.03% | −1,709−1.0% | Reduced |
| United Capital Financial Advisers, LLC | 172,870 | $14.3M | 0.09% | −4,113−2.3% | Reduced |
| Resona Asset Management Co.,Ltd. | 171,182 | $14.2M | 0.07% | −8,170−4.6% | Reduced |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 170,335 | $14.1M | 0.02% | +83,636+96.5% | Added |
| Quantinno Capital Management LP | 167,107 | $13.9M | 0.03% | +46,748+38.8% | Added |
| Commonwealth Equity Services, LLC | 166,586 | $13.8M | 0.02% | −9,242−5.3% | Reduced |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 164,711 | $13.7M | 0.07% | −2,462−1.5% | Reduced |
| Tectonic Advisors LLC | 162,777 | $13.5M | 0.71% | +14,402+9.7% | Added |
| Danske Bank A/S | 162,462 | $13.5M | 0.03% | +13,300+8.9% | Added |
| KLP Kapitalforvaltning AS | 160,616 | $13.4M | 0.05% | +57,600+55.9% | Added |
| Engineers Gate Manager LP | 159,482 | $13.2M | 0.16% | +146,113+1,092.9% | Added |
| Envestnet Asset Management Inc | 156,782 | $13.0M | 0.00% | −44,430−22.1% | Reduced |
| Worldquant Millennium Advisors LLC | 156,036 | $12.9M | 0.05% | −74,876−32.4% | Reduced |
| KBC Group NV | 154,509 | $12.8M | 0.03% | −137,969−47.2% | Reduced |
| Handelsbanken Fonder AB | 153,303 | $12.7M | 0.04% | −8,735−5.4% | Reduced |
| Chevy Chase Trust Holdings, Inc. | 149,862 | $12.4M | 0.03% | −869−0.6% | Reduced |
| United Bank | 149,014 | $12.4M | 1.63% | −18,506−11.0% | Reduced |
| National Bank of Canada | 148,501 | $12.3M | 0.01% | −55,162−27.1% | Reduced |
| Federated Hermes, Inc. | 148,166 | $12.3M | 0.02% | +1,400+1.0% | Added |
| Storebrand Asset Management AS | 146,811 | $12.2M | 0.03% | −5,856−3.8% | Reduced |
| Royal London Asset Management Ltd | 143,403 | $11.9M | 0.03% | −446−0.3% | Reduced |
| Brookfield Asset Management Inc. | 143,320 | $11.9M | 0.01% | +128,205+848.2% | Added |
| Trust Co of Virginia | 142,070 | $11.8M | 0.95% | +2,606+1.9% | Added |
| DnB Asset Management AS | 141,339 | $11.7M | 0.04% | +84,356+148.0% | Added |
| Vert Asset Management LLC | 140,934 | $11.7M | 3.89% | +6,353+4.7% | Added |
| Natixis Advisors, L.P. | 140,414 | $11.6M | 0.02% | −32,538−18.8% | Reduced |
| Sanctuary Advisors, LLC | 137,630 | $11.4M | 0.06% | +5,244+4.0% | Added |
| SG Americas Securities, LLC | 137,582 | $11.4M | 0.02% | +137,582 | New |
| Sargent Investment Group, LLC | 135,094 | $11.2M | 1.41% | −2,310−1.7% | Reduced |
| La Banque Postale Asset Management SA | 134,916 | $11.2M | 0.13% | −10,389−7.1% | Reduced |
| Cambridge Investment Research Advisors, Inc. | 133,882 | $11.1M | 0.03% | −5,609−4.0% | Reduced |
| TCW Group Inc | 132,280 | $11.0M | 0.08% | +51,257+63.3% | Added |
| APG Asset Management N.V. | 154,181 | $10.9M | 0.03% | −10,219−6.2% | Reduced |
| Ar Asset Management Inc | 130,600 | $10.8M | 2.21% | 00.0% | Unchanged |
| Two Sigma Advisers, LP | 130,324 | $10.8M | 0.02% | +123,824+1,905.0% | Added |
| Franklin Resources Inc | 126,993 | $10.5M | 0.00% | −36,425−22.3% | Reduced |
| Creative Planning | 126,089 | $10.5M | 0.01% | +7,036+5.9% | Added |
| Korea Investment CORP | 125,296 | $10.4M | 0.02% | +71,747+134.0% | Added |
| Virginia Retirement Systems Et Al | 124,800 | $10.4M | 0.06% | −7,800−5.9% | Reduced |
| Advisor Group Holdings, Inc. | 123,416 | $10.2M | 0.01% | −31,201−20.2% | Reduced |
| Treasurer of the State of North Carolina | 122,929 | $10.2M | 0.03% | −8,975−6.8% | Reduced |
| Mutual Advisors, LLC | 122,833 | $10.2M | 0.22% | +197+0.2% | Added |
| Mitsubishi UFJ Trust & Banking Corp | 116,939 | $9.70M | 0.02% | −1,089−0.9% | Reduced |
| Nisa Investment Advisors, LLC | 114,661 | $9.62M | 0.03% | −10,481−8.4% | Reduced |
| CIBC World Markets Corp | 115,456 | $9.58M | 0.05% | +115,456 | New |
| B&I Capital AG | 114,720 | $9.52M | 3.38% | +11,750+11.4% | Added |
| Credit Agricole S A | 110,920 | $9.20M | 0.03% | −23,875−17.7% | Reduced |
| Nippon Life Global Investors Americas, Inc. | 108,430 | $9.07M | 0.38% | −43,020−28.4% | Reduced |
| Thrivent Financial for Lutherans | 106,046 | $8.80M | 0.02% | −9,840−8.5% | Reduced |
| HighTower Advisors, LLC | 105,361 | $8.74M | 0.01% | −1,383−1.3% | Reduced |
| Wellington Management Group LLP | 104,127 | $8.64M | 0.00% | −144,765−58.2% | Reduced |
| IFM Investors Pty Ltd | 103,620 | $8.60M | 0.07% | +340.0% | Added |
| Sumitomo Mitsui DS Asset Management Company, Ltd | 102,616 | $8.51M | 0.07% | +2,238+2.2% | Added |
| Kestra Advisory Services, LLC | 101,096 | $8.39M | 0.03% | −1,913−1.9% | Reduced |
| State of Tennessee, Treasury Department | 90,289 | $8.32M | 0.03% | +29,620+48.8% | Added |
| NEOS Investment Management LLC | 100,226 | $8.31M | 0.05% | +17,348+20.9% | Added |
| Lansforsakringar Fondforvaltning AB (publ) | 99,754 | $8.27M | 0.04% | +292+0.3% | Added |
| State of New Jersey Common Pension Fund D | 98,138 | $8.14M | 0.03% | −2,203−2.2% | Reduced |
| Oversea-Chinese Banking CORP Ltd | 96,769 | $8.03M | 0.22% | −7,191−6.9% | Reduced |
| UniSuper Management Pty Ltd | 95,073 | $7.89M | 0.05% | −22,986−19.5% | Reduced |
| Intech Investment Management LLC | 94,216 | $7.82M | 0.07% | +79,779+552.6% | Added |
| Janney Montgomery Scott LLC | 91,418 | $7.58M | 0.02% | −131−0.1% | Reduced |
| Vestcor Inc | 88,891 | $7.37M | 0.21% | +38,332+75.8% | Added |
| Canada Pension Plan Investment Board | 88,145 | $7.31M | 0.00% | −122,138−58.1% | Reduced |
| Varma Mutual Pension Insurance Co | 86,938 | $7.21M | 0.04% | +6,000+7.4% | Added |
| Polar Asset Management Partners Inc. | 86,400 | $7.17M | 0.14% | +65,481+313.0% | Added |
| Private Advisor Group, LLC | 86,310 | $7.16M | 0.03% | −7,746−8.2% | Reduced |
| Foresight Capital Management Advisors, Inc. | 84,763 | $7.03M | 3.81% | +2,712+3.3% | Added |
| Nomura Asset Management International Inc. | 84,223 | $6.99M | 0.01% | +84,223 | New |
| M&T Bank Corp | 83,551 | $6.93M | 0.02% | +24,690+41.9% | Added |
| Chicago Capital, LLC | 83,162 | $6.90M | 0.17% | −854−1.0% | Reduced |
| Nissay Asset Management Corp | 82,877 | $6.87M | 0.04% | +2,194+2.7% | Added |
| Susquehanna International Group, LLP | 82,195 | $6.82M | 0.01% | +14,952+22.2% | Added |
| Arizona State Retirement System | 81,050 | $6.72M | 0.04% | −6,206−7.1% | Reduced |
| Hourglass Capital, LLC | 80,060 | $6.64M | 1.43% | +46,200+136.4% | Added |
| Van Eck Associates Corp | 79,239 | $6.57M | 0.01% | +7,092+9.8% | Added |
| MetLife Investment Management | 79,043 | $6.56M | 0.03% | −2,469−3.0% | Reduced |
| Bank of Nova Scotia | 78,611 | $6.52M | 0.01% | −4,262−5.1% | Reduced |
| Pinebridge Investments LLC | 78,410 | $6.50M | 0.05% | +78,410 | New |
| Czech National Bank | 77,942 | $6.47M | 0.04% | +2,929+3.9% | Added |
| Allworth Financial LP | 77,827 | $6.46M | 0.03% | −95,341−55.1% | Reduced |
| Salem Investment Counselors Inc | 77,478 | $6.44M | 0.18% | +242+0.3% | Added |
| State of Michigan Retirement System | 77,346 | $6.42M | 0.03% | −2,500−3.1% | Reduced |
| Mercer Global Advisors Inc | 75,680 | $6.28M | 0.01% | +8,164+12.1% | Added |
| Public Sector Pension Investment Board | 75,247 | $6.24M | 0.02% | +11,567+18.2% | Added |
| Ensign Peak Advisors, Inc | 74,617 | $6.19M | 0.01% | −47,970−39.1% | Reduced |
| Eurizon Capital SGR S.p.A. | 74,091 | $6.15M | 0.02% | +74,091 | New |