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 |
|---|---|---|---|---|---|
| Cerity Partners LLC | 89,510 | $9.14M | 0.01% | +41,498+86.4% | Added |
| DnB Asset Management AS | 91,233 | $9.32M | 0.03% | −50,106−35.5% | Reduced |
| UniSuper Management Pty Ltd | 91,908 | $9.39M | 0.06% | −3,165−3.3% | Reduced |
| Mercer Global Advisors Inc | 92,369 | $9.43M | 0.01% | +16,689+22.1% | Added |
| Oversea-Chinese Banking CORP Ltd | 92,436 | $9.44M | 0.28% | −4,333−4.5% | Reduced |
| National Bank of Canada | 95,133 | $9.72M | 0.01% | −53,368−35.9% | Reduced |
| State of New Jersey Common Pension Fund D | 99,442 | $10.2M | 0.04% | +1,304+1.3% | Added |
| Bank of Nova Scotia | 99,824 | $10.2M | 0.02% | +21,213+27.0% | Added |
| Lansforsakringar Fondforvaltning AB (publ) | 100,257 | $10.2M | 0.05% | +503+0.5% | Added |
| Credit Agricole S A | 101,026 | $10.3M | 0.03% | −9,894−8.9% | Reduced |
| NEOS Investment Management LLC | 101,062 | $10.3M | 0.05% | +836+0.8% | Added |
| Kestra Advisory Services, LLC | 101,327 | $10.3M | 0.04% | +231+0.2% | Added |
| Ieq Capital, LLC | 101,890 | $10.4M | 0.05% | +38,826+61.6% | Added |
| Susquehanna International Group, LLP | 102,080 | $10.4M | 0.01% | +19,885+24.2% | Added |
| Nisa Investment Advisors, LLC | 101,445 | $10.5M | 0.04% | −13,216−11.5% | Reduced |
| IFM Investors Pty Ltd | 105,601 | $10.8M | 0.09% | +1,981+1.9% | Added |
| HighTower Advisors, LLC | 105,660 | $10.8M | 0.01% | +299+0.3% | Added |
| Thrivent Financial for Lutherans | 106,516 | $10.9M | 0.02% | +470+0.4% | Added |
| Sumitomo Mitsui DS Asset Management Company, Ltd | 109,722 | $11.2M | 0.09% | +7,106+6.9% | Added |
| Advisor Group Holdings, Inc. | 110,503 | $11.3M | 0.02% | −12,913−10.5% | Reduced |
| State of Tennessee, Treasury Department | 112,327 | $11.5M | 0.04% | +22,038+24.4% | Added |
| Nippon Life Global Investors Americas, Inc. | 112,860 | $11.6M | 0.52% | +4,430+4.1% | Added |
| B&I Capital AG | 116,467 | $11.9M | 4.05% | +1,747+1.5% | Added |
| Mitsubishi UFJ Trust & Banking Corp | 117,548 | $12.0M | 0.03% | +609+0.5% | Added |
| Storebrand Asset Management AS | 119,563 | $12.2M | 0.04% | −27,248−18.6% | Reduced |
| Tredje AP-fonden | 119,812 | $12.2M | 0.07% | +89,731+298.3% | Added |
| Walleye Capital LLC | 119,864 | $12.2M | 0.08% | +119,864 | New |
| Korea Investment CORP | 120,047 | $12.3M | 0.03% | −5,249−4.2% | Reduced |
| Intrinsic Edge Capital Management LLC | 121,728 | $12.4M | 2.26% | −57,745−32.2% | Reduced |
| Cambridge Investment Research Advisors, Inc. | 124,200 | $12.7M | 0.03% | −9,682−7.2% | Reduced |
| Treasurer of the State of North Carolina | 125,602 | $12.8M | 0.04% | +2,673+2.2% | Added |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 128,035 | $13.1M | 0.02% | −42,300−24.8% | Reduced |
| HRT Financial LP | 128,338 | $13.1M | 0.03% | +128,338 | New |
| Balyasny Asset Management LLC | 128,692 | $13.1M | 0.03% | −78,117−37.8% | Reduced |
| Mariner, LLC | 129,019 | $13.2M | 0.02% | +65,684+103.7% | Added |
| Mutual Advisors, LLC | 129,055 | $13.2M | 0.28% | +6,222+5.1% | Added |
| Toronto Dominion Bank | 129,533 | $13.2M | 0.03% | −43,773−25.3% | Reduced |
| Ar Asset Management Inc | 130,600 | $13.3M | 2.58% | 00.0% | Unchanged |
| APG Asset Management N.V. | 150,916 | $13.4M | 0.04% | −3,265−2.1% | Reduced |
| Creative Planning | 131,680 | $13.4M | 0.01% | +5,591+4.4% | Added |
| Cander Asset Management LP | 133,253 | $13.6M | 2.44% | −69,485−34.3% | Reduced |
| Sargent Investment Group, LLC | 134,587 | $13.7M | 1.81% | −507−0.4% | Reduced |
| TCW Group Inc | 135,359 | $13.8M | 0.10% | +3,079+2.3% | Added |
| Sanctuary Advisors, LLC | 138,123 | $14.1M | 0.08% | +493+0.4% | Added |
| Boothbay Fund Management, LLC | 141,437 | $14.4M | 0.34% | +141,437 | New |
| Trust Co of Virginia | 141,537 | $14.5M | 1.21% | −533−0.4% | Reduced |
| United Bank | 141,636 | $14.5M | 1.85% | −7,378−5.0% | Reduced |
| Royal London Asset Management Ltd | 142,724 | $14.6M | 0.03% | −679−0.5% | Reduced |
| Chevy Chase Trust Holdings, Inc. | 145,742 | $14.9M | 0.04% | −4,120−2.7% | Reduced |
| Vert Asset Management LLC | 146,406 | $15.0M | 4.75% | +5,472+3.9% | Added |
| Franklin Resources Inc | 147,983 | $15.1M | 0.00% | +20,990+16.5% | Added |
| FIL Ltd | 150,734 | $15.4M | 0.01% | +112,020+289.4% | Added |
| Handelsbanken Fonder AB | 152,282 | $15.6M | 0.05% | −1,021−0.7% | Reduced |
| Commonwealth Equity Services, LLC | 156,662 | $16.0M | 0.02% | −9,924−6.0% | Reduced |
| SG Capital Management LLC | 163,636 | $16.7M | 1.38% | +163,636 | New |
| Danske Bank A/S | 164,162 | $16.8M | 0.04% | +1,700+1.0% | Added |
| Tectonic Advisors LLC | 165,814 | $16.9M | 0.90% | +3,037+1.9% | Added |
| Natixis Advisors, L.P. | 166,136 | $17.0M | 0.02% | +25,722+18.3% | Added |
| Pacer Advisors, Inc. | 167,170 | $17.1M | 0.05% | −56,197−25.2% | Reduced |
| CIBC World Markets Inc. | 168,419 | $17.2M | 0.03% | −39,617−19.0% | Reduced |
| Acadian Asset Management LLC | 168,907 | $17.2M | 0.02% | +165,979+5,668.7% | Added |
| Moran Wealth Management, LLC | 173,360 | $17.7M | 0.54% | −21,780−11.2% | Reduced |
| Manufacturers Life Insurance Company, The | 173,470 | $17.7M | 0.02% | −6,406−3.6% | Reduced |
| Resona Asset Management Co.,Ltd. | 180,600 | $17.8M | 0.09% | +9,418+5.5% | Added |
| United Capital Financial Advisers, LLC | 175,653 | $17.9M | 0.11% | +2,783+1.6% | Added |
| State of Wisconsin Investment Board | 176,520 | $18.0M | 0.04% | +3,383+2.0% | Added |
| State of Alaska, Department of Revenue | 177,709 | $18.1M | 0.20% | +3,530+2.0% | Added |
| Two Sigma Investments, LP | 179,202 | $18.3M | 0.02% | −110,958−38.2% | Reduced |
| TD Asset Management Inc | 181,283 | $18.5M | 0.02% | +863+0.5% | Added |
| New York State Common Retirement Fund | 184,074 | $18.8M | 0.03% | 00.0% | Unchanged |
| Brookfield Asset Management Inc. | 188,255 | $19.2M | 0.03% | +44,935+31.4% | Added |
| Brookstone Capital Management | 188,929 | $19.3M | 0.22% | −47,004−19.9% | Reduced |
| Hudson Bay Capital Management LP | 190,884 | $19.5M | 0.12% | +190,884 | New |
| KLP Kapitalforvaltning AS | 189,916 | $19.5M | 0.08% | +29,300+18.2% | Added |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 198,799 | $20.3M | 0.04% | −6,562−3.2% | Reduced |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 202,316 | $20.7M | 0.11% | +37,605+22.8% | Added |
| Colony Group, LLC | 207,531 | $21.2M | 0.02% | −10,384−4.8% | Reduced |
| Captrust Financial Advisors | 211,691 | $21.6M | 0.04% | −43,451−17.0% | Reduced |
| CI Private Wealth, LLC | 212,318 | $21.7M | 0.03% | +991+0.5% | Added |
| Reaves W H & Co Inc | 213,549 | $21.8M | 0.36% | +159,649+296.2% | Added |
| Federated Hermes, Inc. | 214,126 | $21.9M | 0.04% | +65,960+44.5% | Added |
| Healthcare of Ontario Pension Plan Trust Fund | 214,886 | $21.9M | 0.04% | +203,201+1,739.0% | Added |
| Envestnet Asset Management Inc | 224,847 | $23.0M | 0.01% | +68,065+43.4% | Added |
| Blair William & Co | 225,249 | $23.0M | 0.07% | −13,036−5.5% | Reduced |
| Retirement Systems of Alabama | 227,803 | $23.3M | 0.08% | −268−0.1% | Reduced |
| New York State Teachers Retirement System | 227,876 | $23.3M | 0.05% | 00.0% | Unchanged |
| Victory Capital Management Inc | 238,190 | $24.3M | 0.02% | +39,154+19.7% | Added |
| Americana Partners, LLC | 244,174 | $24.9M | 0.65% | +2,825+1.2% | Added |
| Schonfeld Strategic Advisors LLC | 248,886 | $25.4M | 0.21% | +39,586+18.9% | Added |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main | 251,527 | $25.7M | 0.02% | −244,233−49.3% | Reduced |
| Stifel Financial Corp | 255,348 | $26.1M | 0.02% | +28,114+12.4% | Added |
| Heitman Real Estate Securities LLC | 259,594 | $26.5M | 1.91% | −230,954−47.1% | Reduced |
| Cetera Investment Advisers | 260,039 | $26.6M | 0.03% | +11,442+4.6% | Added |
| Swedbank AB | 260,330 | $26.6M | 0.03% | −24,528−8.6% | Reduced |
| State Board of Administration of Florida Retirement System | 262,515 | $26.8M | 0.05% | 00.0% | Unchanged |
| Aviva PLC | 263,200 | $26.9M | 0.05% | +7,075+2.8% | Added |
| Apollo Management Holdings, L.P. | 265,539 | $27.1M | 0.45% | 00.0% | Unchanged |
| Macquarie Group Ltd | 270,616 | $27.6M | 0.16% | −22,376−7.6% | Reduced |
| STRS Ohio | 287,817 | $29.4M | 0.12% | −126,311−30.5% | Reduced |
| Raymond James Financial Inc | 295,133 | $30.1M | 0.01% | −71,176−19.4% | Reduced |