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, Q1 2026
Institutional positions in Iron Mountain Inc as of Mar 31, 2026. 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
- 1,090
- +87 vs. Q4 2025
- Shares held
- 253.3M
- +47.9M (+23.4%) vs. Q4 2025
- Total value
- $25.9B
- +$8.81B (+51.7%) vs. Q4 2025
- New holders
- 179
- 401 more added
- Sold out
- 92
- 348 more reduced
8 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 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, Q1 2026
Shares, value and share of portfolio for each institution holding Iron Mountain Inc; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main | 251,527 | $25.7M | 0.02% | −244,233−49.3% | Reduced |
| Schonfeld Strategic Advisors LLC | 248,886 | $25.4M | 0.21% | +39,586+18.9% | Added |
| Americana Partners, LLC | 244,174 | $24.9M | 0.65% | +2,825+1.2% | Added |
| Victory Capital Management Inc | 238,190 | $24.3M | 0.02% | +39,154+19.7% | Added |
| New York State Teachers Retirement System | 227,876 | $23.3M | 0.05% | 00.0% | Unchanged |
| Retirement Systems of Alabama | 227,803 | $23.3M | 0.08% | −268−0.1% | Reduced |
| Blair William & Co | 225,249 | $23.0M | 0.07% | −13,036−5.5% | Reduced |
| Envestnet Asset Management Inc | 224,847 | $23.0M | 0.01% | +68,065+43.4% | Added |
| Healthcare of Ontario Pension Plan Trust Fund | 214,886 | $21.9M | 0.04% | +203,201+1,739.0% | Added |
| Federated Hermes, Inc. | 214,126 | $21.9M | 0.04% | +65,960+44.5% | Added |
| Reaves W H & Co Inc | 213,549 | $21.8M | 0.36% | +159,649+296.2% | Added |
| CI Private Wealth, LLC | 212,318 | $21.7M | 0.03% | +991+0.5% | Added |
| Captrust Financial Advisors | 211,691 | $21.6M | 0.04% | −43,451−17.0% | Reduced |
| Colony Group, LLC | 207,531 | $21.2M | 0.02% | −10,384−4.8% | Reduced |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 202,316 | $20.7M | 0.11% | +37,605+22.8% | Added |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 198,799 | $20.3M | 0.04% | −6,562−3.2% | Reduced |
| KLP Kapitalforvaltning AS | 189,916 | $19.5M | 0.08% | +29,300+18.2% | Added |
| Hudson Bay Capital Management LP | 190,884 | $19.5M | 0.12% | +190,884 | New |
| Brookstone Capital Management | 188,929 | $19.3M | 0.22% | −47,004−19.9% | Reduced |
| Brookfield Asset Management Inc. | 188,255 | $19.2M | 0.03% | +44,935+31.4% | Added |
| New York State Common Retirement Fund | 184,074 | $18.8M | 0.03% | 00.0% | Unchanged |
| TD Asset Management Inc | 181,283 | $18.5M | 0.02% | +863+0.5% | Added |
| Two Sigma Investments, LP | 179,202 | $18.3M | 0.02% | −110,958−38.2% | Reduced |
| State of Alaska, Department of Revenue | 177,709 | $18.1M | 0.20% | +3,530+2.0% | Added |
| State of Wisconsin Investment Board | 176,520 | $18.0M | 0.04% | +3,383+2.0% | Added |
| United Capital Financial Advisers, LLC | 175,653 | $17.9M | 0.11% | +2,783+1.6% | Added |
| Resona Asset Management Co.,Ltd. | 180,600 | $17.8M | 0.09% | +9,418+5.5% | Added |
| Manufacturers Life Insurance Company, The | 173,470 | $17.7M | 0.02% | −6,406−3.6% | Reduced |
| Moran Wealth Management, LLC | 173,360 | $17.7M | 0.54% | −21,780−11.2% | Reduced |
| Acadian Asset Management LLC | 168,907 | $17.2M | 0.02% | +165,979+5,668.7% | Added |
| CIBC World Markets Inc. | 168,419 | $17.2M | 0.03% | −39,617−19.0% | Reduced |
| Pacer Advisors, Inc. | 167,170 | $17.1M | 0.05% | −56,197−25.2% | Reduced |
| Natixis Advisors, L.P. | 166,136 | $17.0M | 0.02% | +25,722+18.3% | Added |
| Tectonic Advisors LLC | 165,814 | $16.9M | 0.90% | +3,037+1.9% | Added |
| Danske Bank A/S | 164,162 | $16.8M | 0.04% | +1,700+1.0% | Added |
| SG Capital Management LLC | 163,636 | $16.7M | 1.38% | +163,636 | New |
| Commonwealth Equity Services, LLC | 156,662 | $16.0M | 0.02% | −9,924−6.0% | Reduced |
| Handelsbanken Fonder AB | 152,282 | $15.6M | 0.05% | −1,021−0.7% | Reduced |
| FIL Ltd | 150,734 | $15.4M | 0.01% | +112,020+289.4% | Added |
| Franklin Resources Inc | 147,983 | $15.1M | 0.00% | +20,990+16.5% | Added |
| Vert Asset Management LLC | 146,406 | $15.0M | 4.75% | +5,472+3.9% | Added |
| Chevy Chase Trust Holdings, Inc. | 145,742 | $14.9M | 0.04% | −4,120−2.7% | Reduced |
| Royal London Asset Management Ltd | 142,724 | $14.6M | 0.03% | −679−0.5% | Reduced |
| United Bank | 141,636 | $14.5M | 1.85% | −7,378−5.0% | Reduced |
| Trust Co of Virginia | 141,537 | $14.5M | 1.21% | −533−0.4% | Reduced |
| Boothbay Fund Management, LLC | 141,437 | $14.4M | 0.34% | +141,437 | New |
| Sanctuary Advisors, LLC | 138,123 | $14.1M | 0.08% | +493+0.4% | Added |
| TCW Group Inc | 135,359 | $13.8M | 0.10% | +3,079+2.3% | Added |
| Sargent Investment Group, LLC | 134,587 | $13.7M | 1.81% | −507−0.4% | Reduced |
| Cander Asset Management LP | 133,253 | $13.6M | 2.44% | −69,485−34.3% | Reduced |
| Creative Planning | 131,680 | $13.4M | 0.01% | +5,591+4.4% | Added |
| APG Asset Management N.V. | 150,916 | $13.4M | 0.04% | −3,265−2.1% | Reduced |
| Ar Asset Management Inc | 130,600 | $13.3M | 2.58% | 00.0% | Unchanged |
| Toronto Dominion Bank | 129,533 | $13.2M | 0.03% | −43,773−25.3% | Reduced |
| Mutual Advisors, LLC | 129,055 | $13.2M | 0.28% | +6,222+5.1% | Added |
| Mariner, LLC | 129,019 | $13.2M | 0.02% | +65,684+103.7% | Added |
| Balyasny Asset Management LLC | 128,692 | $13.1M | 0.03% | −78,117−37.8% | Reduced |
| HRT Financial LP | 128,338 | $13.1M | 0.03% | +128,338 | New |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 128,035 | $13.1M | 0.02% | −42,300−24.8% | Reduced |
| Treasurer of the State of North Carolina | 125,602 | $12.8M | 0.04% | +2,673+2.2% | Added |
| Cambridge Investment Research Advisors, Inc. | 124,200 | $12.7M | 0.03% | −9,682−7.2% | Reduced |
| Intrinsic Edge Capital Management LLC | 121,728 | $12.4M | 2.26% | −57,745−32.2% | Reduced |
| Korea Investment CORP | 120,047 | $12.3M | 0.03% | −5,249−4.2% | Reduced |
| Walleye Capital LLC | 119,864 | $12.2M | 0.08% | +119,864 | New |
| Tredje AP-fonden | 119,812 | $12.2M | 0.07% | +89,731+298.3% | Added |
| Storebrand Asset Management AS | 119,563 | $12.2M | 0.04% | −27,248−18.6% | Reduced |
| Mitsubishi UFJ Trust & Banking Corp | 117,548 | $12.0M | 0.03% | +609+0.5% | Added |
| B&I Capital AG | 116,467 | $11.9M | 4.05% | +1,747+1.5% | Added |
| Nippon Life Global Investors Americas, Inc. | 112,860 | $11.6M | 0.52% | +4,430+4.1% | Added |
| State of Tennessee, Treasury Department | 112,327 | $11.5M | 0.04% | +22,038+24.4% | Added |
| Advisor Group Holdings, Inc. | 110,503 | $11.3M | 0.02% | −12,913−10.5% | Reduced |
| Sumitomo Mitsui DS Asset Management Company, Ltd | 109,722 | $11.2M | 0.09% | +7,106+6.9% | Added |
| Thrivent Financial for Lutherans | 106,516 | $10.9M | 0.02% | +470+0.4% | Added |
| HighTower Advisors, LLC | 105,660 | $10.8M | 0.01% | +299+0.3% | Added |
| IFM Investors Pty Ltd | 105,601 | $10.8M | 0.09% | +1,981+1.9% | Added |
| Nisa Investment Advisors, LLC | 101,445 | $10.5M | 0.04% | −13,216−11.5% | Reduced |
| Susquehanna International Group, LLP | 102,080 | $10.4M | 0.01% | +19,885+24.2% | Added |
| Ieq Capital, LLC | 101,890 | $10.4M | 0.05% | +38,826+61.6% | Added |
| Kestra Advisory Services, LLC | 101,327 | $10.3M | 0.04% | +231+0.2% | Added |
| NEOS Investment Management LLC | 101,062 | $10.3M | 0.05% | +836+0.8% | Added |
| Credit Agricole S A | 101,026 | $10.3M | 0.03% | −9,894−8.9% | Reduced |
| Lansforsakringar Fondforvaltning AB (publ) | 100,257 | $10.2M | 0.05% | +503+0.5% | Added |
| Bank of Nova Scotia | 99,824 | $10.2M | 0.02% | +21,213+27.0% | Added |
| State of New Jersey Common Pension Fund D | 99,442 | $10.2M | 0.04% | +1,304+1.3% | Added |
| National Bank of Canada | 95,133 | $9.72M | 0.01% | −53,368−35.9% | Reduced |
| Oversea-Chinese Banking CORP Ltd | 92,436 | $9.44M | 0.28% | −4,333−4.5% | Reduced |
| Mercer Global Advisors Inc | 92,369 | $9.43M | 0.01% | +16,689+22.1% | Added |
| UniSuper Management Pty Ltd | 91,908 | $9.39M | 0.06% | −3,165−3.3% | Reduced |
| DnB Asset Management AS | 91,233 | $9.32M | 0.03% | −50,106−35.5% | Reduced |
| Cerity Partners LLC | 89,510 | $9.14M | 0.01% | +41,498+86.4% | Added |
| Eurizon Capital SGR S.p.A. | 89,615 | $9.13M | 0.03% | +15,524+21.0% | Added |
| Janney Montgomery Scott LLC | 88,356 | $9.03M | 0.02% | −3,062−3.3% | Reduced |
| Varma Mutual Pension Insurance Co | 86,938 | $8.88M | 0.05% | 00.0% | Unchanged |
| Private Advisor Group, LLC | 85,309 | $8.71M | 0.04% | −1,001−1.2% | Reduced |
| Nissay Asset Management Corp | 84,739 | $8.66M | 0.05% | +1,862+2.2% | Added |
| Public Sector Pension Investment Board | 84,193 | $8.60M | 0.03% | +8,946+11.9% | Added |
| Chicago Capital, LLC | 83,951 | $8.57M | 0.23% | +789+0.9% | Added |
| Raiffeisen Bank International AG | 87,657 | $8.56M | 0.12% | +23,141+35.9% | Added |
| Van Eck Associates Corp | 83,567 | $8.54M | 0.01% | +4,328+5.5% | Added |
| Mirova | 83,040 | $8.48M | 0.34% | +83,040 | New |