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 |
|---|---|---|---|---|---|
| M&T Bank Corp | 82,770 | $8.45M | 0.03% | −781−0.9% | Reduced |
| Squarepoint Ops LLC | 81,640 | $8.34M | 0.02% | +42,818+110.3% | Added |
| Qube Research & Technologies Ltd | 81,478 | $8.32M | 0.01% | +81,478 | New |
| Adams Diversified Equity Fund, Inc. | 80,800 | $8.25M | 0.29% | +80,800 | New |
| Czech National Bank | 80,569 | $8.23M | 0.05% | +2,627+3.4% | Added |
| Arizona State Retirement System | 80,363 | $8.21M | 0.05% | −687−0.8% | Reduced |
| KBC Group NV | 80,345 | $8.21M | 0.02% | −74,164−48.0% | Reduced |
| Fjarde Ap-Fonden /Fourth Swedish National Pension Fund | 79,921 | $8.16M | 0.04% | +28,595+55.7% | Added |
| Salem Investment Counselors Inc | 78,121 | $7.98M | 0.23% | +643+0.8% | Added |
| MetLife Investment Management | 77,453 | $7.91M | 0.04% | −1,590−2.0% | Reduced |
| State of Michigan Retirement System | 77,246 | $7.89M | 0.04% | −100−0.1% | Reduced |
| Allworth Financial LP | 76,346 | $7.80M | 0.03% | −1,481−1.9% | Reduced |
| Azimuth Capital Investment Management LLC | 75,235 | $7.68M | 0.29% | +3,250+4.5% | Added |
| Wiley Bros.-Aintree Capital, LLC | 73,354 | $7.49M | 0.04% | −170.0% | Reduced |
| CIBC Asset Management Inc | 71,980 | $7.35M | 0.02% | +79+0.1% | Added |
| Nordea Investment Management AB | 72,955 | $7.32M | 0.01% | +5,027+7.4% | Added |
| Intact Investment Management Inc. | 71,600 | $7.31M | 0.21% | 00.0% | Unchanged |
| Wealthfront Advisers LLC | 69,793 | $7.13M | 0.02% | +2,354+3.5% | Added |
| Hourglass Capital, LLC | 69,700 | $7.12M | 1.48% | −10,360−12.9% | Reduced |
| SEB Asset Management AB | 69,230 | $7.07M | 0.03% | +69,230 | New |
| The PNC Financial Services Group, Inc. | 68,569 | $7.00M | 0.00% | +7,375+12.1% | Added |
| Foresight Capital Management Advisors, Inc. | 68,289 | $6.97M | 3.88% | −16,474−19.4% | Reduced |
| MML Investors Services, LLC | 67,744 | $6.92M | 0.02% | +2,577+4.0% | Added |
| Mirae Asset Global Investments Co., Ltd. | 67,300 | $6.87M | 0.02% | +5,389+8.7% | Added |
| Lee Danner & Bass Inc | 67,141 | $6.86M | 0.43% | +1,933+3.0% | Added |
| USS Investment Management Ltd | 66,744 | $6.82M | 0.03% | +2,172+3.4% | Added |
| Northwestern Mutual Wealth Management Co | 66,680 | $6.81M | 0.00% | +739+1.1% | Added |
| Engineers Gate Manager LP | 66,394 | $6.78M | 0.08% | −93,088−58.4% | Reduced |
| Woodstock Corp | 65,497 | $6.69M | 0.60% | +1,780+2.8% | Added |
| QRG Capital Management, Inc. | 64,952 | $6.63M | 0.07% | +14,031+27.6% | Added |
| Vestcor Inc | 64,510 | $6.59M | 0.18% | −24,381−27.4% | Reduced |
| PFA Pension, Forsikringsaktieselskab | 63,697 | $6.51M | 0.02% | +223+0.4% | Added |
| Thompson Siegel & Walmsley LLC | 62,100 | $6.34M | 0.11% | +15,800+34.1% | Added |
| ASR Vermogensbeheer N.V. | 61,925 | $6.33M | 0.07% | +1,166+1.9% | Added |
| PensionDanmark Pensionsforsikringsaktieselskab | 61,027 | $6.23M | 0.06% | +3,877+6.8% | Added |
| Swiss Life Asset Management Ltd | 60,611 | $6.19M | 0.03% | −737−1.2% | Reduced |
| PEAK6 LLC | 60,388 | $6.17M | 0.18% | +55,071+1,035.8% | Added |
| Easterly Investment Partners LLC | 61,996 | $6.11M | 0.47% | −11,520−15.7% | Reduced |
| Voya Investment Management LLC | 58,235 | $5.95M | 0.01% | −115−0.2% | Reduced |
| Osmosis Investment Management UK Ltd | 57,710 | $5.94M | 0.16% | +40,180+229.2% | Added |
| Woodline Partners LP | 57,860 | $5.91M | 0.02% | +7,507+14.9% | Added |
| Peapack Gladstone Financial Corp | 57,373 | $5.86M | 0.07% | −325−0.6% | Reduced |
| Xponance, Inc. | 55,989 | $5.72M | 0.04% | +7,095+14.5% | Added |
| Allspring Global Investments Holdings, LLC | 56,453 | $5.70M | 0.01% | +22,562+66.6% | Added |
| First Trust Advisors LP | 55,694 | $5.69M | 0.00% | +2,011+3.7% | Added |
| Federation des caisses Desjardins du Quebec | 54,898 | $5.61M | 0.02% | +4,811+9.6% | Added |
| ProShare Advisors LLC | 54,548 | $5.57M | 0.01% | −12,000−18.0% | Reduced |
| Candriam Luxembourg S.C.A. | 53,827 | $5.50M | 0.03% | −7,316−12.0% | Reduced |
| Oak Thistle LLC | 53,641 | $5.48M | 0.53% | +53,641 | New |
| CWM, LLC | 53,578 | $5.47M | 0.01% | +31,967+147.9% | Added |
| Amalgamated Bank | 53,267 | $5.44M | 0.04% | −1,718−3.1% | Reduced |
| Werlinich Asset Management, LLC | 51,982 | $5.31M | 2.58% | +75+0.1% | Added |
| New Age Alpha Advisors, LLC | 51,587 | $5.27M | 0.25% | −18,304−26.2% | Reduced |
| Hennion & Walsh Asset Management, Inc. | 51,046 | $5.21M | 0.18% | −4,718−8.5% | Reduced |
| First National Trust Co | 50,618 | $5.17M | 0.18% | −645−1.3% | Reduced |
| Kempen Capital Management N.V. | 50,467 | $5.15M | 0.05% | −5,611−10.0% | Reduced |
| Advisors Asset Management, Inc. | 50,399 | $5.15M | 0.09% | +1,534+3.1% | Added |
| Nia Impact Advisors, LLC | 49,872 | $5.09M | 2.26% | −2,102−4.0% | Reduced |
| Wealth Enhancement Advisory Services, LLC | 53,411 | $5.09M | 0.01% | −1,173−2.1% | Reduced |
| JustInvest LLC | 49,490 | $5.05M | 0.05% | +5,348+12.1% | Added |
| Utah Retirement Systems | 47,687 | $4.87M | 0.05% | −792−1.6% | Reduced |
| RB Capital Management, LLC | 47,363 | $4.84M | 1.03% | +147+0.3% | Added |
| Ethic Inc. | 45,926 | $4.69M | 0.07% | −2,351−4.9% | Reduced |
| O'Shaughnessy Asset Management, LLC | 45,599 | $4.66M | 0.02% | +13,151+40.5% | Added |
| Police & Firemen's Retirement System of New Jersey | 45,128 | $4.61M | 0.04% | +178+0.4% | Added |
| Steward Partners Investment Advisory, LLC | 44,785 | $4.57M | 0.02% | +1,910+4.5% | Added |
| New York Life Investment Management LLC | 44,193 | $4.51M | 0.04% | +1,135+2.6% | Added |
| Trinity Legacy Partners, LLC | 38,864 | $4.43M | 0.96% | −642−1.6% | Reduced |
| Jones Financial Companies LLLP | 44,536 | $4.38M | 0.00% | +21,518+93.5% | Added |
| Baird Financial Group, Inc. | 42,707 | $4.36M | 0.01% | −3,184−6.9% | Reduced |
| Pensionfund DSM Netherlands | 42,500 | $4.34M | 2.51% | +4,000+10.4% | Added |
| Anson Funds Management LP | 42,200 | $4.31M | 0.57% | +42,200 | New |
| Venture Visionary Partners LLC | 42,173 | $4.31M | 0.14% | +6,411+17.9% | Added |
| Rakuten Investment Management, Inc. | 43,893 | $4.28M | 0.01% | +5,019+12.9% | Added |
| GWM Advisors LLC | 41,818 | $4.27M | 0.02% | +16,692+66.4% | Added |
| Moors & Cabot, Inc. | 41,277 | $4.22M | 0.18% | −1,152−2.7% | Reduced |
| British Columbia Investment Management Corp | 40,739 | $4.16M | 0.02% | −11,530−22.1% | Reduced |
| Holderness Investments Co | 40,339 | $4.12M | 0.83% | −385−0.9% | Reduced |
| Yousif Capital Management, LLC | 39,914 | $4.08M | 0.05% | −1,292−3.1% | Reduced |
| Gotham Asset Management, LLC | 39,732 | $4.06M | 0.01% | +1,185+3.1% | Added |
| Regions Financial Corp | 39,516 | $4.04M | 0.03% | −175,126−81.6% | Reduced |
| Pinebridge Investments LLC | 39,476 | $4.03M | 0.03% | −38,934−49.7% | Reduced |
| Pacitti Group Inc. | 39,233 | $4.03M | 1.47% | +1,594+4.2% | Added |
| WealthTrust Axiom LLC | 39,384 | $4.02M | 0.99% | +37+0.1% | Added |
| D.A. Davidson & Co. | 38,481 | $3.93M | 0.02% | +5,832+17.9% | Added |
| Spirit of America Management Corp | 38,450 | $3.93M | 0.78% | +600+1.6% | Added |
| Tudor Investment Corp Et Al | 37,208 | $3.80M | 0.02% | +15,018+67.7% | Added |
| American Trust Investment Advisors, LLC | 37,146 | $3.79M | 2.10% | +522+1.4% | Added |
| ING Groep NV | 36,276 | $3.71M | 0.02% | +36,276 | New |
| Pathstone Holdings, LLC | 36,209 | $3.70M | 0.01% | +1,439+4.1% | Added |
| Warren Averett Asset Management, LLC | 36,018 | $3.68M | 0.03% | +1,596+4.6% | Added |
| Mackenzie Financial Corp | 35,592 | $3.64M | 0.00% | +2,841+8.7% | Added |
| Truist Financial Corp | 34,031 | $3.48M | 0.00% | −2,913−7.9% | Reduced |
| Oregon Public Employees Retirement Fund | 33,889 | $3.46M | 0.05% | +100+0.3% | Added |
| Y-Intercept (Hong Kong) Ltd | 33,654 | $3.44M | 0.07% | +9,382+38.7% | Added |
| Janus Henderson Group PLC | 33,266 | $3.40M | 0.00% | −4,766−12.5% | Reduced |
| Smithfield Trust Co | 31,715 | $3.24M | 0.14% | −464−1.4% | Reduced |
| Allstate Corp | 31,714 | $3.24M | 0.03% | +9,287+41.4% | Added |
| Knights of Columbus Asset Advisors LLC | 31,649 | $3.23M | 0.18% | 00.0% | Unchanged |
| Andra AP-fonden | 31,552 | $3.22M | 0.04% | −169,748−84.3% | Reduced |