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, Q3 2025
Institutional positions in Iron Mountain Inc as of Sep 30, 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
- 1,017
- −13 vs. Q2 2025
- Shares held
- 250.3M
- +5.90M (+2.4%) vs. Q2 2025
- Total value
- $25.5B
- +$450.7M (+1.8%) vs. Q2 2025
- New holders
- 75
- 370 more added
- Sold out
- 88
- 390 more reduced
15 institutions that held it in Q2 2025 haven't filed for Q3 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q2 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, Q3 2025
Shares, value and share of portfolio for each institution holding Iron Mountain Inc; share changes are against Q2 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Advisors Asset Management, Inc. | 59,972 | $6.11M | 0.10% | −3,539−5.6% | Reduced |
| State of Tennessee, Treasury Department | 60,669 | $6.18M | 0.02% | −39,428−39.4% | Reduced |
| Citadel Advisors LLC | 61,291 | $6.25M | 0.01% | −78,500−56.2% | Reduced |
| ProShare Advisors LLC | 61,866 | $6.31M | 0.01% | +996+1.6% | Added |
| Acadian Asset Management LLC | 62,416 | $6.36M | 0.01% | +60,407+3,006.8% | Added |
| Voya Investment Management LLC | 62,625 | $6.38M | 0.01% | −19,025−23.3% | Reduced |
| Lighthouse Investment Partners, LLC | 63,000 | $6.42M | 0.23% | +12,800+25.5% | Added |
| Woodstock Corp | 63,057 | $6.43M | 0.56% | +7,679+13.9% | Added |
| QRG Capital Management, Inc. | 63,474 | $6.47M | 0.08% | −75,498−54.3% | Reduced |
| Public Sector Pension Investment Board | 63,680 | $6.49M | 0.02% | +3,008+5.0% | Added |
| Northwestern Mutual Wealth Management Co | 64,388 | $6.56M | 0.00% | +4,158+6.9% | Added |
| The PNC Financial Services Group, Inc. | 65,054 | $6.63M | 0.00% | −332−0.5% | Reduced |
| Kempen Capital Management N.V. | 66,559 | $6.79M | 0.06% | −6,874−9.4% | Reduced |
| MML Investors Services, LLC | 66,907 | $6.82M | 0.02% | −11,857−15.1% | Reduced |
| Susquehanna International Group, LLP | 67,243 | $6.85M | 0.01% | −56,527−45.7% | Reduced |
| Mercer Global Advisors Inc | 67,516 | $6.88M | 0.01% | −13,754−16.9% | Reduced |
| Nordea Investment Management AB | 68,437 | $6.91M | 0.01% | +4,523+7.1% | Added |
| Azimuth Capital Investment Management LLC | 69,326 | $7.07M | 0.25% | +664+1.0% | Added |
| Squarepoint Ops LLC | 70,329 | $7.17M | 0.02% | +62,395+786.4% | Added |
| Forsta Ap-Fonden | 70,900 | $7.23M | 0.04% | −20,100−22.1% | Reduced |
| New Age Alpha Advisors, LLC | 72,143 | $7.35M | 0.31% | −5,712−7.3% | Reduced |
| Van Eck Associates Corp | 72,147 | $7.36M | 0.01% | +7,043+10.8% | Added |
| Pinebridge Investments, L.P. | 72,235 | $7.36M | 0.05% | −45,754−38.8% | Reduced |
| ASR Vermogensbeheer N.V. | 73,176 | $7.46M | 0.09% | −505−0.7% | Reduced |
| Wealthfront Advisers LLC | 74,201 | $7.56M | 0.02% | −1,780−2.3% | Reduced |
| Czech National Bank | 75,013 | $7.65M | 0.05% | +2,894+4.0% | Added |
| Salem Investment Counselors Inc | 77,236 | $7.87M | 0.23% | +20.0% | Added |
| Prudential PLC | 77,572 | $7.91M | 0.06% | +23,271+42.9% | Added |
| State of Michigan Retirement System | 79,846 | $8.14M | 0.04% | −400−0.5% | Reduced |
| Hudson Bay Capital Management LP | 80,657 | $8.22M | 0.05% | +74,549+1,220.5% | Added |
| Nissay Asset Management Corp | 80,683 | $8.22M | 0.05% | −133−0.2% | Reduced |
| Varma Mutual Pension Insurance Co | 80,938 | $8.25M | 0.05% | +6,400+8.6% | Added |
| TCW Group Inc | 81,023 | $8.26M | 0.07% | +81,023 | New |
| MetLife Investment Management | 81,512 | $8.31M | 0.04% | −2,007−2.4% | Reduced |
| Foresight Capital Management Advisors, Inc. | 82,051 | $8.36M | 4.70% | −4,665−5.4% | Reduced |
| Bank of Nova Scotia | 82,873 | $8.45M | 0.01% | +40,684+96.4% | Added |
| NEOS Investment Management LLC | 82,878 | $8.45M | 0.06% | +43,818+112.2% | Added |
| Gotham Asset Management, LLC | 83,924 | $8.56M | 0.04% | −10,904−11.5% | Reduced |
| Chicago Capital, LLC | 84,016 | $8.56M | 0.21% | −13,620−13.9% | Reduced |
| Summit Partners Public Asset Management, LLC | 85,000 | $8.66M | 0.28% | +85,000 | New |
| Thompson Siegel & Walmsley LLC | 86,400 | $8.81M | 0.14% | +20,200+30.5% | Added |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 86,699 | $8.84M | 0.02% | +5,096+6.2% | Added |
| Sonora Investment Management Group, LLC | 87,250 | $8.89M | 0.63% | −2,250−2.5% | Reduced |
| Arizona State Retirement System | 87,256 | $8.89M | 0.05% | +1,401+1.6% | Added |
| Janney Montgomery Scott LLC | 91,549 | $9.33M | 0.02% | +841+0.9% | Added |
| Public Employees Retirement System of Ohio | 91,656 | $9.34M | 0.03% | −941−1.0% | Reduced |
| Private Advisor Group, LLC | 94,056 | $9.59M | 0.05% | −4,994−5.0% | Reduced |
| Schonfeld Strategic Advisors LLC | 98,229 | $10.0M | 0.07% | −364,924−78.8% | Reduced |
| Lansforsakringar Fondforvaltning AB (publ) | 99,462 | $10.1M | 0.05% | +9,209+10.2% | Added |
| Sora Investors LLC | 100,319 | $10.2M | 0.95% | +4,342+4.5% | Added |
| State of New Jersey Common Pension Fund D | 100,341 | $10.2M | 0.04% | +3,329+3.4% | Added |
| Sumitomo Mitsui DS Asset Management Company, Ltd | 100,378 | $10.2M | 0.08% | +3,364+3.5% | Added |
| IFM Investors Pty Ltd | 103,586 | $10.5M | 0.09% | +557+0.5% | Added |
| B&I Capital AG | 102,970 | $10.5M | 3.63% | +24,315+30.9% | Added |
| Kestra Advisory Services, LLC | 103,009 | $10.5M | 0.05% | +14,092+15.8% | Added |
| KLP Kapitalforvaltning AS | 103,016 | $10.6M | 0.04% | 00.0% | Unchanged |
| Oversea-Chinese Banking CORP Ltd | 103,960 | $10.6M | 0.27% | +15,225+17.2% | Added |
| Susquehanna Portfolio Strategies, LLC | 105,141 | $10.7M | 0.17% | −104,555−49.9% | Reduced |
| HighTower Advisors, LLC | 106,744 | $10.9M | 0.01% | −3,344−3.0% | Reduced |
| Allspring Global Investments Holdings, LLC | 111,781 | $11.4M | 0.02% | −367−0.3% | Reduced |
| AXA Investment Managers S.A. | 113,347 | $11.6M | 0.03% | +113,347 | New |
| Waterfront Capital Partners, LLC | 115,286 | $11.8M | 7.69% | −95,187−45.2% | Reduced |
| Thrivent Financial for Lutherans | 115,886 | $11.8M | 0.02% | +8,594+8.0% | Added |
| Mitsubishi UFJ Trust & Banking Corp | 118,028 | $12.0M | 0.03% | −6,205−5.0% | Reduced |
| UniSuper Management Pty Ltd | 118,059 | $12.0M | 0.07% | +5,845+5.2% | Added |
| CIBC Bancorp USA Inc. | 118,362 | $12.1M | 0.07% | +118,362 | New |
| Capital Fund Management S.A. | 118,570 | $12.1M | 0.12% | −38,208−24.4% | Reduced |
| Creative Planning | 119,053 | $12.1M | 0.01% | +4,466+3.9% | Added |
| Quantinno Capital Management LP | 120,359 | $12.3M | 0.03% | +31,848+36.0% | Added |
| Ensign Peak Advisors, Inc | 122,587 | $12.5M | 0.02% | −86,308−41.3% | Reduced |
| Mutual Advisors, LLC | 122,636 | $12.7M | 0.28% | −9,820−7.4% | Reduced |
| Nisa Investment Advisors, LLC | 125,142 | $12.9M | 0.05% | +40,341+47.6% | Added |
| Colony Group, LLC | 129,596 | $13.2M | 0.02% | +1,748+1.4% | Added |
| Ar Asset Management Inc | 130,600 | $13.3M | 2.81% | 00.0% | Unchanged |
| Treasurer of the State of North Carolina | 131,904 | $13.4M | 0.04% | −5,143−3.8% | Reduced |
| Sanctuary Advisors, LLC | 132,386 | $13.5M | 0.08% | +1,485+1.1% | Added |
| Virginia Retirement Systems Et Al | 132,600 | $13.5M | 0.09% | +10,300+8.4% | Added |
| Vert Asset Management LLC | 134,581 | $13.7M | 4.61% | +5,099+3.9% | Added |
| Credit Agricole S A | 134,795 | $13.7M | 0.05% | +134,795 | New |
| Sargent Investment Group, LLC | 137,404 | $14.0M | 2.00% | +653+0.5% | Added |
| Trust Co of Virginia | 139,464 | $14.2M | 1.19% | −963−0.7% | Reduced |
| Cambridge Investment Research Advisors, Inc. | 139,491 | $14.2M | 0.04% | −3,965−2.8% | Reduced |
| APG Asset Management N.V. | 164,400 | $14.3M | 0.04% | 00.0% | Unchanged |
| Royal London Asset Management Ltd | 143,849 | $14.7M | 0.03% | +615+0.4% | Added |
| D. E. Shaw & Co., Inc. | 144,039 | $14.7M | 0.01% | −439,938−75.3% | Reduced |
| La Banque Postale Asset Management SA | 145,305 | $14.8M | 0.18% | +30,834+26.9% | Added |
| Dana Investment Advisors, Inc. | 145,541 | $14.8M | 0.43% | −3,777−2.5% | Reduced |
| Federated Hermes, Inc. | 146,766 | $15.0M | 0.03% | −16,166−9.9% | Reduced |
| Advisor Group Holdings, Inc. | 154,617 | $15.1M | 0.02% | +35,470+29.8% | Added |
| Tectonic Advisors LLC | 148,375 | $15.1M | 0.83% | +19,999+15.6% | Added |
| Balyasny Asset Management LLC | 148,929 | $15.2M | 0.03% | −239,268−61.6% | Reduced |
| Danske Bank A/S | 149,162 | $15.2M | 0.04% | +3,900+2.7% | Added |
| Intrinsic Edge Capital Management LLC | 149,371 | $15.2M | 2.31% | −35,470−19.2% | Reduced |
| First Trust Advisors LP | 149,839 | $15.3M | 0.01% | +92,136+159.7% | Added |
| Chevy Chase Trust Holdings, Inc. | 150,731 | $15.4M | 0.04% | −5,109−3.3% | Reduced |
| Nippon Life Global Investors Americas, Inc. | 151,450 | $15.5M | 0.66% | +3,330+2.2% | Added |
| Storebrand Asset Management AS | 152,667 | $15.6M | 0.04% | +1,002+0.7% | Added |
| Handelsbanken Fonder AB | 162,038 | $16.5M | 0.05% | +1,765+1.1% | Added |
| Franklin Resources Inc | 163,418 | $16.7M | 0.00% | +14,111+9.5% | Added |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 167,173 | $17.0M | 0.09% | −239−0.1% | Reduced |