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 |
|---|---|---|---|---|---|
| Pathstone Holdings, LLC | 36,209 | $3.70M | 0.01% | +1,439+4.1% | Added |
| ING Groep NV | 36,276 | $3.71M | 0.02% | +36,276 | New |
| American Trust Investment Advisors, LLC | 37,146 | $3.79M | 2.10% | +522+1.4% | Added |
| Tudor Investment Corp Et Al | 37,208 | $3.80M | 0.02% | +15,018+67.7% | Added |
| Spirit of America Management Corp | 38,450 | $3.93M | 0.78% | +600+1.6% | Added |
| D.A. Davidson & Co. | 38,481 | $3.93M | 0.02% | +5,832+17.9% | Added |
| WealthTrust Axiom LLC | 39,384 | $4.02M | 0.99% | +37+0.1% | Added |
| Pacitti Group Inc. | 39,233 | $4.03M | 1.47% | +1,594+4.2% | Added |
| Pinebridge Investments LLC | 39,476 | $4.03M | 0.03% | −38,934−49.7% | Reduced |
| Regions Financial Corp | 39,516 | $4.04M | 0.03% | −175,126−81.6% | Reduced |
| Gotham Asset Management, LLC | 39,732 | $4.06M | 0.01% | +1,185+3.1% | Added |
| Yousif Capital Management, LLC | 39,914 | $4.08M | 0.05% | −1,292−3.1% | Reduced |
| Holderness Investments Co | 40,339 | $4.12M | 0.83% | −385−0.9% | Reduced |
| British Columbia Investment Management Corp | 40,739 | $4.16M | 0.02% | −11,530−22.1% | Reduced |
| Moors & Cabot, Inc. | 41,277 | $4.22M | 0.18% | −1,152−2.7% | Reduced |
| GWM Advisors LLC | 41,818 | $4.27M | 0.02% | +16,692+66.4% | Added |
| Rakuten Investment Management, Inc. | 43,893 | $4.28M | 0.01% | +5,019+12.9% | Added |
| Venture Visionary Partners LLC | 42,173 | $4.31M | 0.14% | +6,411+17.9% | Added |
| Anson Funds Management LP | 42,200 | $4.31M | 0.57% | +42,200 | New |
| Pensionfund DSM Netherlands | 42,500 | $4.34M | 2.51% | +4,000+10.4% | Added |
| Baird Financial Group, Inc. | 42,707 | $4.36M | 0.01% | −3,184−6.9% | Reduced |
| Jones Financial Companies LLLP | 44,536 | $4.38M | 0.00% | +21,518+93.5% | Added |
| Trinity Legacy Partners, LLC | 38,864 | $4.43M | 0.96% | −642−1.6% | Reduced |
| New York Life Investment Management LLC | 44,193 | $4.51M | 0.04% | +1,135+2.6% | Added |
| Steward Partners Investment Advisory, LLC | 44,785 | $4.57M | 0.02% | +1,910+4.5% | Added |
| Police & Firemen's Retirement System of New Jersey | 45,128 | $4.61M | 0.04% | +178+0.4% | Added |
| O'Shaughnessy Asset Management, LLC | 45,599 | $4.66M | 0.02% | +13,151+40.5% | Added |
| Ethic Inc. | 45,926 | $4.69M | 0.07% | −2,351−4.9% | Reduced |
| RB Capital Management, LLC | 47,363 | $4.84M | 1.03% | +147+0.3% | Added |
| Utah Retirement Systems | 47,687 | $4.87M | 0.05% | −792−1.6% | Reduced |
| JustInvest LLC | 49,490 | $5.05M | 0.05% | +5,348+12.1% | Added |
| Wealth Enhancement Advisory Services, LLC | 53,411 | $5.09M | 0.01% | −1,173−2.1% | Reduced |
| Nia Impact Advisors, LLC | 49,872 | $5.09M | 2.26% | −2,102−4.0% | Reduced |
| Advisors Asset Management, Inc. | 50,399 | $5.15M | 0.09% | +1,534+3.1% | Added |
| Kempen Capital Management N.V. | 50,467 | $5.15M | 0.05% | −5,611−10.0% | Reduced |
| First National Trust Co | 50,618 | $5.17M | 0.18% | −645−1.3% | Reduced |
| Hennion & Walsh Asset Management, Inc. | 51,046 | $5.21M | 0.18% | −4,718−8.5% | Reduced |
| New Age Alpha Advisors, LLC | 51,587 | $5.27M | 0.25% | −18,304−26.2% | Reduced |
| Werlinich Asset Management, LLC | 51,982 | $5.31M | 2.58% | +75+0.1% | Added |
| Amalgamated Bank | 53,267 | $5.44M | 0.04% | −1,718−3.1% | Reduced |
| CWM, LLC | 53,578 | $5.47M | 0.01% | +31,967+147.9% | Added |
| Oak Thistle LLC | 53,641 | $5.48M | 0.53% | +53,641 | New |
| Candriam Luxembourg S.C.A. | 53,827 | $5.50M | 0.03% | −7,316−12.0% | Reduced |
| ProShare Advisors LLC | 54,548 | $5.57M | 0.01% | −12,000−18.0% | Reduced |
| Federation des caisses Desjardins du Quebec | 54,898 | $5.61M | 0.02% | +4,811+9.6% | Added |
| First Trust Advisors LP | 55,694 | $5.69M | 0.00% | +2,011+3.7% | Added |
| Allspring Global Investments Holdings, LLC | 56,453 | $5.70M | 0.01% | +22,562+66.6% | Added |
| Xponance, Inc. | 55,989 | $5.72M | 0.04% | +7,095+14.5% | Added |
| Peapack Gladstone Financial Corp | 57,373 | $5.86M | 0.07% | −325−0.6% | Reduced |
| Woodline Partners LP | 57,860 | $5.91M | 0.02% | +7,507+14.9% | Added |
| Osmosis Investment Management UK Ltd | 57,710 | $5.94M | 0.16% | +40,180+229.2% | Added |
| Voya Investment Management LLC | 58,235 | $5.95M | 0.01% | −115−0.2% | Reduced |
| Easterly Investment Partners LLC | 61,996 | $6.11M | 0.47% | −11,520−15.7% | Reduced |
| PEAK6 LLC | 60,388 | $6.17M | 0.18% | +55,071+1,035.8% | Added |
| Swiss Life Asset Management Ltd | 60,611 | $6.19M | 0.03% | −737−1.2% | Reduced |
| PensionDanmark Pensionsforsikringsaktieselskab | 61,027 | $6.23M | 0.06% | +3,877+6.8% | Added |
| ASR Vermogensbeheer N.V. | 61,925 | $6.33M | 0.07% | +1,166+1.9% | Added |
| Thompson Siegel & Walmsley LLC | 62,100 | $6.34M | 0.11% | +15,800+34.1% | Added |
| PFA Pension, Forsikringsaktieselskab | 63,697 | $6.51M | 0.02% | +223+0.4% | Added |
| Vestcor Inc | 64,510 | $6.59M | 0.18% | −24,381−27.4% | Reduced |
| QRG Capital Management, Inc. | 64,952 | $6.63M | 0.07% | +14,031+27.6% | Added |
| Woodstock Corp | 65,497 | $6.69M | 0.60% | +1,780+2.8% | Added |
| Engineers Gate Manager LP | 66,394 | $6.78M | 0.08% | −93,088−58.4% | Reduced |
| Northwestern Mutual Wealth Management Co | 66,680 | $6.81M | 0.00% | +739+1.1% | Added |
| USS Investment Management Ltd | 66,744 | $6.82M | 0.03% | +2,172+3.4% | Added |
| Lee Danner & Bass Inc | 67,141 | $6.86M | 0.43% | +1,933+3.0% | Added |
| Mirae Asset Global Investments Co., Ltd. | 67,300 | $6.87M | 0.02% | +5,389+8.7% | Added |
| MML Investors Services, LLC | 67,744 | $6.92M | 0.02% | +2,577+4.0% | Added |
| Foresight Capital Management Advisors, Inc. | 68,289 | $6.97M | 3.88% | −16,474−19.4% | Reduced |
| The PNC Financial Services Group, Inc. | 68,569 | $7.00M | 0.00% | +7,375+12.1% | Added |
| SEB Asset Management AB | 69,230 | $7.07M | 0.03% | +69,230 | New |
| Hourglass Capital, LLC | 69,700 | $7.12M | 1.48% | −10,360−12.9% | Reduced |
| Wealthfront Advisers LLC | 69,793 | $7.13M | 0.02% | +2,354+3.5% | Added |
| Intact Investment Management Inc. | 71,600 | $7.31M | 0.21% | 00.0% | Unchanged |
| Nordea Investment Management AB | 72,955 | $7.32M | 0.01% | +5,027+7.4% | Added |
| CIBC Asset Management Inc | 71,980 | $7.35M | 0.02% | +79+0.1% | Added |
| Wiley Bros.-Aintree Capital, LLC | 73,354 | $7.49M | 0.04% | −170.0% | Reduced |
| Azimuth Capital Investment Management LLC | 75,235 | $7.68M | 0.29% | +3,250+4.5% | Added |
| Allworth Financial LP | 76,346 | $7.80M | 0.03% | −1,481−1.9% | Reduced |
| State of Michigan Retirement System | 77,246 | $7.89M | 0.04% | −100−0.1% | Reduced |
| MetLife Investment Management | 77,453 | $7.91M | 0.04% | −1,590−2.0% | Reduced |
| Salem Investment Counselors Inc | 78,121 | $7.98M | 0.23% | +643+0.8% | Added |
| Fjarde Ap-Fonden /Fourth Swedish National Pension Fund | 79,921 | $8.16M | 0.04% | +28,595+55.7% | Added |
| KBC Group NV | 80,345 | $8.21M | 0.02% | −74,164−48.0% | Reduced |
| Arizona State Retirement System | 80,363 | $8.21M | 0.05% | −687−0.8% | Reduced |
| Czech National Bank | 80,569 | $8.23M | 0.05% | +2,627+3.4% | Added |
| Adams Diversified Equity Fund, Inc. | 80,800 | $8.25M | 0.29% | +80,800 | New |
| Qube Research & Technologies Ltd | 81,478 | $8.32M | 0.01% | +81,478 | New |
| Squarepoint Ops LLC | 81,640 | $8.34M | 0.02% | +42,818+110.3% | Added |
| M&T Bank Corp | 82,770 | $8.45M | 0.03% | −781−0.9% | Reduced |
| Mirova | 83,040 | $8.48M | 0.34% | +83,040 | New |
| Van Eck Associates Corp | 83,567 | $8.54M | 0.01% | +4,328+5.5% | Added |
| Raiffeisen Bank International AG | 87,657 | $8.56M | 0.12% | +23,141+35.9% | Added |
| Chicago Capital, LLC | 83,951 | $8.57M | 0.23% | +789+0.9% | Added |
| Public Sector Pension Investment Board | 84,193 | $8.60M | 0.03% | +8,946+11.9% | Added |
| Nissay Asset Management Corp | 84,739 | $8.66M | 0.05% | +1,862+2.2% | Added |
| Private Advisor Group, LLC | 85,309 | $8.71M | 0.04% | −1,001−1.2% | Reduced |
| Varma Mutual Pension Insurance Co | 86,938 | $8.88M | 0.05% | 00.0% | Unchanged |
| Janney Montgomery Scott LLC | 88,356 | $9.03M | 0.02% | −3,062−3.3% | Reduced |
| Eurizon Capital SGR S.p.A. | 89,615 | $9.13M | 0.03% | +15,524+21.0% | Added |