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, Q4 2025
Institutional positions in Iron Mountain Inc as of Dec 31, 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
- 1,011
- +16 vs. Q3 2025
- Shares held
- 257.3M
- +7.46M (+3.0%) vs. Q3 2025
- Total value
- $21.4B
- −$4.12B (−16.2%) vs. Q3 2025
- New holders
- 123
- 326 more added
- Sold out
- 107
- 407 more reduced
22 institutions that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q3 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, Q4 2025
Shares, value and share of portfolio for each institution holding Iron Mountain Inc; share changes are against Q3 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Banco Bilbao Vizcaya Argentaria, S.A. | 73,824 | $6.11M | 0.04% | +64,579+698.5% | Added |
| Easterly Investment Partners LLC | 73,516 | $6.10M | 0.37% | +73,516 | New |
| Wiley Bros.-Aintree Capital, LLC | 73,371 | $6.09M | 0.03% | +51,129+229.9% | Added |
| Azimuth Capital Investment Management LLC | 71,985 | $5.97M | 0.21% | +2,659+3.8% | Added |
| CIBC Asset Management Inc | 71,901 | $5.96M | 0.01% | +29,110+68.0% | Added |
| Intact Investment Management Inc. | 71,600 | $5.94M | 0.17% | +36,400+103.4% | Added |
| Forsta Ap-Fonden | 70,900 | $5.88M | 0.04% | 00.0% | Unchanged |
| New Age Alpha Advisors, LLC | 69,891 | $5.80M | 0.25% | −2,252−3.1% | Reduced |
| Nordea Investment Management AB | 67,928 | $5.64M | 0.00% | −509−0.7% | Reduced |
| Wealthfront Advisers LLC | 67,439 | $5.59M | 0.01% | −6,762−9.1% | Reduced |
| ProShare Advisors LLC | 66,548 | $5.52M | 0.01% | +4,682+7.6% | Added |
| Northwestern Mutual Wealth Management Co | 65,941 | $5.47M | 0.00% | +1,553+2.4% | Added |
| Lee Danner & Bass Inc | 65,208 | $5.41M | 0.39% | +22,625+53.1% | Added |
| MML Investors Services, LLC | 65,167 | $5.41M | 0.01% | −1,740−2.6% | Reduced |
| Raiffeisen Bank International AG | 64,516 | $5.38M | 0.07% | +9,849+18.0% | Added |
| USS Investment Management Ltd | 64,572 | $5.35M | 0.03% | +4,732+7.9% | Added |
| PFA Pension, Forsikringsaktieselskab | 63,474 | $5.29M | 0.02% | +63,474 | New |
| Woodstock Corp | 63,717 | $5.29M | 0.45% | +660+1.0% | Added |
| Mariner, LLC | 63,335 | $5.26M | 0.01% | +16,381+34.9% | Added |
| Ieq Capital, LLC | 63,064 | $5.23M | 0.02% | +59,963+1,933.7% | Added |
| Mirae Asset Global Investments Co., Ltd. | 61,911 | $5.14M | 0.01% | +11,129+21.9% | Added |
| Swiss Life Asset Management Ltd | 61,348 | $5.09M | 0.03% | +5,940+10.7% | Added |
| The PNC Financial Services Group, Inc. | 61,194 | $5.08M | 0.00% | −3,860−5.9% | Reduced |
| Candriam Luxembourg S.C.A. | 61,143 | $5.07M | 0.03% | +2,037+3.4% | Added |
| ASR Vermogensbeheer N.V. | 60,759 | $5.04M | 0.06% | −12,417−17.0% | Reduced |
| Voya Investment Management LLC | 58,350 | $4.84M | 0.00% | −4,275−6.8% | Reduced |
| Peapack Gladstone Financial Corp | 57,698 | $4.79M | 0.06% | −1,875−3.1% | Reduced |
| Man Group plc | 57,346 | $4.76M | 0.01% | +45,195+371.9% | Added |
| PensionDanmark Pensionsforsikringsaktieselskab | 57,150 | $4.74M | 0.04% | +57,150 | New |
| Kempen Capital Management N.V. | 56,078 | $4.65M | 0.04% | −10,481−15.7% | Reduced |
| Wealth Enhancement Advisory Services, LLC | 54,584 | $4.64M | 0.01% | +5,565+11.4% | Added |
| Hennion & Walsh Asset Management, Inc. | 55,764 | $4.63M | 0.16% | −3,453−5.8% | Reduced |
| Amalgamated Bank | 54,985 | $4.56M | 0.03% | −1,113−2.0% | Reduced |
| Skandinaviska Enskilda Banken AB (publ) | 54,151 | $4.49M | 0.02% | −762−1.4% | Reduced |
| Reaves W H & Co Inc | 53,900 | $4.47M | 0.08% | +53,900 | New |
| First Trust Advisors LP | 53,683 | $4.45M | 0.00% | −96,156−64.2% | Reduced |
| British Columbia Investment Management Corp | 52,269 | $4.34M | 0.02% | +9,868+23.3% | Added |
| Werlinich Asset Management, LLC | 51,907 | $4.33M | 2.13% | +95+0.2% | Added |
| Nia Impact Advisors, LLC | 51,974 | $4.31M | 1.45% | −1,193−2.2% | Reduced |
| Fjarde Ap-Fonden /Fourth Swedish National Pension Fund | 51,326 | $4.26M | 0.04% | +51,326 | New |
| First National Trust Co | 51,263 | $4.25M | 0.14% | +240.0% | Added |
| QRG Capital Management, Inc. | 50,921 | $4.22M | 0.05% | −12,553−19.8% | Reduced |
| Woodline Partners LP | 50,353 | $4.18M | 0.02% | +11,395+29.2% | Added |
| Federation des caisses Desjardins du Quebec | 50,087 | $4.15M | 0.02% | +4,903+10.9% | Added |
| Xponance, Inc. | 48,894 | $4.06M | 0.03% | +2,710+5.9% | Added |
| Advisors Asset Management, Inc. | 48,865 | $4.05M | 0.07% | −11,107−18.5% | Reduced |
| Utah Retirement Systems | 48,479 | $4.02M | 0.04% | 00.0% | Unchanged |
| Ethic Inc. | 48,277 | $4.00M | 0.06% | −435−0.9% | Reduced |
| Cerity Partners LLC | 48,012 | $3.98M | 0.01% | +9,825+25.7% | Added |
| Sora Investors LLC | 47,345 | $3.93M | 0.34% | −52,974−52.8% | Reduced |
| RB Capital Management, LLC | 47,216 | $3.92M | 0.79% | +477+1.0% | Added |
| Dana Investment Advisors, Inc. | 47,137 | $3.91M | 0.11% | −98,404−67.6% | Reduced |
| Burney Co | 46,647 | $3.87M | 0.12% | −2,956−6.0% | Reduced |
| Thompson Siegel & Walmsley LLC | 46,300 | $3.84M | 0.06% | −40,100−46.4% | Reduced |
| Royal Fund Management, LLC | 46,030 | $3.82M | 0.35% | +32,335+236.1% | Added |
| Twinbeech Capital LP | 45,900 | $3.81M | 0.27% | +45,900 | New |
| Baird Financial Group, Inc. | 45,891 | $3.81M | 0.01% | −747−1.6% | Reduced |
| Yousif Capital Management, LLC | 41,206 | $3.81M | 0.04% | −4,651−10.1% | Reduced |
| Police & Firemen's Retirement System of New Jersey | 44,950 | $3.73M | 0.03% | −2,284−4.8% | Reduced |
| JustInvest LLC | 44,142 | $3.66M | 0.04% | +5,102+13.1% | Added |
| New York Life Investment Management LLC | 43,058 | $3.57M | 0.03% | −116−0.3% | Reduced |
| Steward Partners Investment Advisory, LLC | 42,875 | $3.56M | 0.02% | +2,526+6.3% | Added |
| Moors & Cabot, Inc. | 42,429 | $3.52M | 0.15% | −1,780−4.0% | Reduced |
| Holderness Investments Co | 40,724 | $3.38M | 0.69% | −692−1.7% | Reduced |
| Trinity Legacy Partners, LLC | 39,506 | $3.28M | 0.75% | +818+2.1% | Added |
| Connor, Clark & Lunn Investment Management Ltd. | 39,394 | $3.27M | 0.01% | +12,277+45.3% | Added |
| WealthTrust Axiom LLC | 39,347 | $3.26M | 0.84% | −3,011−7.1% | Reduced |
| Squarepoint Ops LLC | 38,822 | $3.22M | 0.01% | −31,507−44.8% | Reduced |
| Rakuten Investment Management, Inc. | 38,874 | $3.21M | 0.01% | +8,296+27.1% | Added |
| FIL Ltd | 38,714 | $3.21M | 0.00% | +34,440+805.8% | Added |
| Gotham Asset Management, LLC | 38,547 | $3.20M | 0.01% | −45,377−54.1% | Reduced |
| Pensionfund DSM Netherlands | 38,500 | $3.19M | 2.10% | 00.0% | Unchanged |
| Rafferty Asset Management, LLC | 38,219 | $3.17M | 0.01% | −1,495−3.8% | Reduced |
| Janus Henderson Group PLC | 38,032 | $3.15M | 0.00% | +588+1.6% | Added |
| Pacitti Group Inc. | 37,639 | $3.15M | 1.16% | +893+2.4% | Added |
| Spirit of America Management Corp | 37,850 | $3.14M | 0.67% | −1,100−2.8% | Reduced |
| Vectors Research Management, LLC | 37,625 | $3.12M | 0.95% | −3,962−9.5% | Reduced |
| Truist Financial Corp | 36,944 | $3.06M | 0.00% | −7,974−17.8% | Reduced |
| American Trust Investment Advisors, LLC | 36,624 | $3.04M | 1.62% | +294+0.8% | Added |
| Fieldview Capital Management, LLC | 36,518 | $3.03M | 0.51% | +6,187+20.4% | Added |
| Mirae Asset Global ETFs Holdings Ltd. | 35,876 | $2.98M | 0.00% | +7,935+28.4% | Added |
| Venture Visionary Partners LLC | 35,762 | $2.97M | 0.10% | +2,582+7.8% | Added |
| Allianz Asset Management GmbH | 35,364 | $2.93M | 0.00% | −7,910−18.3% | Reduced |
| Pathstone Holdings, LLC | 34,770 | $2.89M | 0.01% | −492−1.4% | Reduced |
| Warren Averett Asset Management, LLC | 34,422 | $2.86M | 0.02% | +433+1.3% | Added |
| Allspring Global Investments Holdings, LLC | 33,891 | $2.82M | 0.00% | −77,890−69.7% | Reduced |
| Oregon Public Employees Retirement Fund | 33,789 | $2.80M | 0.04% | 00.0% | Unchanged |
| OP Asset Management Ltd | 32,917 | $2.73M | 0.03% | +283+0.9% | Added |
| Mackenzie Financial Corp | 32,751 | $2.72M | 0.00% | +1,953+6.3% | Added |
| D.A. Davidson & Co. | 32,649 | $2.71M | 0.02% | +2,779+9.3% | Added |
| O'Shaughnessy Asset Management, LLC | 32,448 | $2.69M | 0.01% | −4,656−12.5% | Reduced |
| Smithfield Trust Co | 32,179 | $2.67M | 0.12% | −248−0.8% | Reduced |
| Norinchukin Bank, The | 31,811 | $2.64M | 0.03% | +719+2.3% | Added |
| Mutual of America Capital Management LLC | 31,737 | $2.63M | 0.03% | −277−0.9% | Reduced |
| Knights of Columbus Asset Advisors LLC | 31,649 | $2.63M | 0.15% | +1,847+6.2% | Added |
| Prana Capital Management, LP | 31,092 | $2.58M | 0.09% | +20,732+200.1% | Added |
| One Capital Management, LLC | 30,505 | $2.53M | 0.08% | −1,152−3.6% | Reduced |
| Uniplan Investment Counsel, Inc. | 30,327 | $2.52M | 0.25% | +30,327 | New |
| Buckland Partners Management Co LLC | 30,000 | $2.51M | 1.40% | +30,000 | New |
| Tredje AP-fonden | 30,081 | $2.50M | 0.02% | −1,206−3.9% | Reduced |