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 |
|---|---|---|---|---|---|
| ProShare Advisors LLC | 66,548 | $5.52M | 0.01% | +4,682+7.6% | Added |
| Wealthfront Advisers LLC | 67,439 | $5.59M | 0.01% | −6,762−9.1% | Reduced |
| Nordea Investment Management AB | 67,928 | $5.64M | 0.00% | −509−0.7% | Reduced |
| New Age Alpha Advisors, LLC | 69,891 | $5.80M | 0.25% | −2,252−3.1% | Reduced |
| Forsta Ap-Fonden | 70,900 | $5.88M | 0.04% | 00.0% | Unchanged |
| Intact Investment Management Inc. | 71,600 | $5.94M | 0.17% | +36,400+103.4% | Added |
| CIBC Asset Management Inc | 71,901 | $5.96M | 0.01% | +29,110+68.0% | Added |
| Azimuth Capital Investment Management LLC | 71,985 | $5.97M | 0.21% | +2,659+3.8% | Added |
| Wiley Bros.-Aintree Capital, LLC | 73,371 | $6.09M | 0.03% | +51,129+229.9% | Added |
| Easterly Investment Partners LLC | 73,516 | $6.10M | 0.37% | +73,516 | New |
| Banco Bilbao Vizcaya Argentaria, S.A. | 73,824 | $6.11M | 0.04% | +64,579+698.5% | Added |
| Eurizon Capital SGR S.p.A. | 74,091 | $6.15M | 0.02% | +74,091 | New |
| Ensign Peak Advisors, Inc | 74,617 | $6.19M | 0.01% | −47,970−39.1% | Reduced |
| Public Sector Pension Investment Board | 75,247 | $6.24M | 0.02% | +11,567+18.2% | Added |
| Mercer Global Advisors Inc | 75,680 | $6.28M | 0.01% | +8,164+12.1% | Added |
| State of Michigan Retirement System | 77,346 | $6.42M | 0.03% | −2,500−3.1% | Reduced |
| Salem Investment Counselors Inc | 77,478 | $6.44M | 0.18% | +242+0.3% | Added |
| Allworth Financial LP | 77,827 | $6.46M | 0.03% | −95,341−55.1% | Reduced |
| Czech National Bank | 77,942 | $6.47M | 0.04% | +2,929+3.9% | Added |
| Pinebridge Investments LLC | 78,410 | $6.50M | 0.05% | +78,410 | New |
| Bank of Nova Scotia | 78,611 | $6.52M | 0.01% | −4,262−5.1% | Reduced |
| MetLife Investment Management | 79,043 | $6.56M | 0.03% | −2,469−3.0% | Reduced |
| Van Eck Associates Corp | 79,239 | $6.57M | 0.01% | +7,092+9.8% | Added |
| Hourglass Capital, LLC | 80,060 | $6.64M | 1.43% | +46,200+136.4% | Added |
| Arizona State Retirement System | 81,050 | $6.72M | 0.04% | −6,206−7.1% | Reduced |
| Susquehanna International Group, LLP | 82,195 | $6.82M | 0.01% | +14,952+22.2% | Added |
| Nissay Asset Management Corp | 82,877 | $6.87M | 0.04% | +2,194+2.7% | Added |
| Chicago Capital, LLC | 83,162 | $6.90M | 0.17% | −854−1.0% | Reduced |
| M&T Bank Corp | 83,551 | $6.93M | 0.02% | +24,690+41.9% | Added |
| Nomura Asset Management International Inc. | 84,223 | $6.99M | 0.01% | +84,223 | New |
| Foresight Capital Management Advisors, Inc. | 84,763 | $7.03M | 3.81% | +2,712+3.3% | Added |
| Private Advisor Group, LLC | 86,310 | $7.16M | 0.03% | −7,746−8.2% | Reduced |
| Polar Asset Management Partners Inc. | 86,400 | $7.17M | 0.14% | +65,481+313.0% | Added |
| Varma Mutual Pension Insurance Co | 86,938 | $7.21M | 0.04% | +6,000+7.4% | Added |
| Canada Pension Plan Investment Board | 88,145 | $7.31M | 0.00% | −122,138−58.1% | Reduced |
| Vestcor Inc | 88,891 | $7.37M | 0.21% | +38,332+75.8% | Added |
| Janney Montgomery Scott LLC | 91,418 | $7.58M | 0.02% | −131−0.1% | Reduced |
| Intech Investment Management LLC | 94,216 | $7.82M | 0.07% | +79,779+552.6% | Added |
| UniSuper Management Pty Ltd | 95,073 | $7.89M | 0.05% | −22,986−19.5% | Reduced |
| Oversea-Chinese Banking CORP Ltd | 96,769 | $8.03M | 0.22% | −7,191−6.9% | Reduced |
| State of New Jersey Common Pension Fund D | 98,138 | $8.14M | 0.03% | −2,203−2.2% | Reduced |
| Lansforsakringar Fondforvaltning AB (publ) | 99,754 | $8.27M | 0.04% | +292+0.3% | Added |
| NEOS Investment Management LLC | 100,226 | $8.31M | 0.05% | +17,348+20.9% | Added |
| State of Tennessee, Treasury Department | 90,289 | $8.32M | 0.03% | +29,620+48.8% | Added |
| Kestra Advisory Services, LLC | 101,096 | $8.39M | 0.03% | −1,913−1.9% | Reduced |
| Sumitomo Mitsui DS Asset Management Company, Ltd | 102,616 | $8.51M | 0.07% | +2,238+2.2% | Added |
| IFM Investors Pty Ltd | 103,620 | $8.60M | 0.07% | +340.0% | Added |
| Wellington Management Group LLP | 104,127 | $8.64M | 0.00% | −144,765−58.2% | Reduced |
| HighTower Advisors, LLC | 105,361 | $8.74M | 0.01% | −1,383−1.3% | Reduced |
| Thrivent Financial for Lutherans | 106,046 | $8.80M | 0.02% | −9,840−8.5% | Reduced |
| Nippon Life Global Investors Americas, Inc. | 108,430 | $9.07M | 0.38% | −43,020−28.4% | Reduced |
| Credit Agricole S A | 110,920 | $9.20M | 0.03% | −23,875−17.7% | Reduced |
| B&I Capital AG | 114,720 | $9.52M | 3.38% | +11,750+11.4% | Added |
| CIBC World Markets Corp | 115,456 | $9.58M | 0.05% | +115,456 | New |
| Nisa Investment Advisors, LLC | 114,661 | $9.62M | 0.03% | −10,481−8.4% | Reduced |
| Mitsubishi UFJ Trust & Banking Corp | 116,939 | $9.70M | 0.02% | −1,089−0.9% | Reduced |
| Mutual Advisors, LLC | 122,833 | $10.2M | 0.22% | +197+0.2% | Added |
| Treasurer of the State of North Carolina | 122,929 | $10.2M | 0.03% | −8,975−6.8% | Reduced |
| Advisor Group Holdings, Inc. | 123,416 | $10.2M | 0.01% | −31,201−20.2% | Reduced |
| Virginia Retirement Systems Et Al | 124,800 | $10.4M | 0.06% | −7,800−5.9% | Reduced |
| Korea Investment CORP | 125,296 | $10.4M | 0.02% | +71,747+134.0% | Added |
| Creative Planning | 126,089 | $10.5M | 0.01% | +7,036+5.9% | Added |
| Franklin Resources Inc | 126,993 | $10.5M | 0.00% | −36,425−22.3% | Reduced |
| Two Sigma Advisers, LP | 130,324 | $10.8M | 0.02% | +123,824+1,905.0% | Added |
| Ar Asset Management Inc | 130,600 | $10.8M | 2.21% | 00.0% | Unchanged |
| APG Asset Management N.V. | 154,181 | $10.9M | 0.03% | −10,219−6.2% | Reduced |
| TCW Group Inc | 132,280 | $11.0M | 0.08% | +51,257+63.3% | Added |
| Cambridge Investment Research Advisors, Inc. | 133,882 | $11.1M | 0.03% | −5,609−4.0% | Reduced |
| La Banque Postale Asset Management SA | 134,916 | $11.2M | 0.13% | −10,389−7.1% | Reduced |
| Sargent Investment Group, LLC | 135,094 | $11.2M | 1.41% | −2,310−1.7% | Reduced |
| SG Americas Securities, LLC | 137,582 | $11.4M | 0.02% | +137,582 | New |
| Sanctuary Advisors, LLC | 137,630 | $11.4M | 0.06% | +5,244+4.0% | Added |
| Natixis Advisors, L.P. | 140,414 | $11.6M | 0.02% | −32,538−18.8% | Reduced |
| Vert Asset Management LLC | 140,934 | $11.7M | 3.89% | +6,353+4.7% | Added |
| DnB Asset Management AS | 141,339 | $11.7M | 0.04% | +84,356+148.0% | Added |
| Trust Co of Virginia | 142,070 | $11.8M | 0.95% | +2,606+1.9% | Added |
| Brookfield Asset Management Inc. | 143,320 | $11.9M | 0.01% | +128,205+848.2% | Added |
| Royal London Asset Management Ltd | 143,403 | $11.9M | 0.03% | −446−0.3% | Reduced |
| Storebrand Asset Management AS | 146,811 | $12.2M | 0.03% | −5,856−3.8% | Reduced |
| Federated Hermes, Inc. | 148,166 | $12.3M | 0.02% | +1,400+1.0% | Added |
| National Bank of Canada | 148,501 | $12.3M | 0.01% | −55,162−27.1% | Reduced |
| United Bank | 149,014 | $12.4M | 1.63% | −18,506−11.0% | Reduced |
| Chevy Chase Trust Holdings, Inc. | 149,862 | $12.4M | 0.03% | −869−0.6% | Reduced |
| Handelsbanken Fonder AB | 153,303 | $12.7M | 0.04% | −8,735−5.4% | Reduced |
| KBC Group NV | 154,509 | $12.8M | 0.03% | −137,969−47.2% | Reduced |
| Worldquant Millennium Advisors LLC | 156,036 | $12.9M | 0.05% | −74,876−32.4% | Reduced |
| Envestnet Asset Management Inc | 156,782 | $13.0M | 0.00% | −44,430−22.1% | Reduced |
| Engineers Gate Manager LP | 159,482 | $13.2M | 0.16% | +146,113+1,092.9% | Added |
| KLP Kapitalforvaltning AS | 160,616 | $13.4M | 0.05% | +57,600+55.9% | Added |
| Danske Bank A/S | 162,462 | $13.5M | 0.03% | +13,300+8.9% | Added |
| Tectonic Advisors LLC | 162,777 | $13.5M | 0.71% | +14,402+9.7% | Added |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 164,711 | $13.7M | 0.07% | −2,462−1.5% | Reduced |
| Commonwealth Equity Services, LLC | 166,586 | $13.8M | 0.02% | −9,242−5.3% | Reduced |
| Quantinno Capital Management LP | 167,107 | $13.9M | 0.03% | +46,748+38.8% | Added |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 170,335 | $14.1M | 0.02% | +83,636+96.5% | Added |
| Resona Asset Management Co.,Ltd. | 171,182 | $14.2M | 0.07% | −8,170−4.6% | Reduced |
| United Capital Financial Advisers, LLC | 172,870 | $14.3M | 0.09% | −4,113−2.3% | Reduced |
| State of Wisconsin Investment Board | 173,137 | $14.4M | 0.03% | −1,709−1.0% | Reduced |
| Toronto Dominion Bank | 173,306 | $14.4M | 0.03% | −3,701−2.1% | Reduced |
| State of Alaska, Department of Revenue | 174,179 | $14.4M | 0.15% | −1,115−0.6% | Reduced |