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 |
|---|---|---|---|---|---|
| B. Metzler seel. Sohn & Co. AG | 26,499 | $2.20M | 0.02% | −3,136−10.6% | Reduced |
| Independent Advisor Alliance | 26,767 | $2.22M | 0.05% | +61+0.2% | Added |
| Sage Capital Management, LLC | 27,210 | $2.26M | 1.04% | −1,995−6.8% | Reduced |
| Aurora Investment Counsel | 27,420 | $2.27M | 1.20% | +1,243+4.7% | Added |
| Courier Capital LLC | 27,610 | $2.29M | 0.13% | −3,061−10.0% | Reduced |
| Heritage Trust Co | 27,806 | $2.31M | 0.23% | +6,652+31.4% | Added |
| Public Employees Retirement Association of Colorado | 28,336 | $2.35M | 0.01% | 00.0% | Unchanged |
| Siemens Fonds Invest GmbH | 28,370 | $2.36M | 0.13% | −10,588−27.2% | Reduced |
| Dumont & Blake Investment Advisors LLC | 28,597 | $2.37M | 0.57% | −1,299−4.3% | Reduced |
| Bessemer Group Inc | 28,651 | $2.38M | 0.00% | +19,601+216.6% | Added |
| Cyndeo Wealth Partners, LLC | 29,850 | $2.48M | 0.13% | −4,378−12.8% | Reduced |
| Tredje AP-fonden | 30,081 | $2.50M | 0.02% | −1,206−3.9% | Reduced |
| Buckland Partners Management Co LLC | 30,000 | $2.51M | 1.40% | +30,000 | New |
| Uniplan Investment Counsel, Inc. | 30,327 | $2.52M | 0.25% | +30,327 | New |
| One Capital Management, LLC | 30,505 | $2.53M | 0.08% | −1,152−3.6% | Reduced |
| Prana Capital Management, LP | 31,092 | $2.58M | 0.09% | +20,732+200.1% | Added |
| Knights of Columbus Asset Advisors LLC | 31,649 | $2.63M | 0.15% | +1,847+6.2% | Added |
| Mutual of America Capital Management LLC | 31,737 | $2.63M | 0.03% | −277−0.9% | Reduced |
| Norinchukin Bank, The | 31,811 | $2.64M | 0.03% | +719+2.3% | Added |
| Smithfield Trust Co | 32,179 | $2.67M | 0.12% | −248−0.8% | Reduced |
| O'Shaughnessy Asset Management, LLC | 32,448 | $2.69M | 0.01% | −4,656−12.5% | Reduced |
| D.A. Davidson & Co. | 32,649 | $2.71M | 0.02% | +2,779+9.3% | Added |
| Mackenzie Financial Corp | 32,751 | $2.72M | 0.00% | +1,953+6.3% | Added |
| OP Asset Management Ltd | 32,917 | $2.73M | 0.03% | +283+0.9% | Added |
| Oregon Public Employees Retirement Fund | 33,789 | $2.80M | 0.04% | 00.0% | Unchanged |
| Allspring Global Investments Holdings, LLC | 33,891 | $2.82M | 0.00% | −77,890−69.7% | Reduced |
| Warren Averett Asset Management, LLC | 34,422 | $2.86M | 0.02% | +433+1.3% | Added |
| Pathstone Holdings, LLC | 34,770 | $2.89M | 0.01% | −492−1.4% | Reduced |
| Allianz Asset Management GmbH | 35,364 | $2.93M | 0.00% | −7,910−18.3% | Reduced |
| Venture Visionary Partners LLC | 35,762 | $2.97M | 0.10% | +2,582+7.8% | Added |
| Mirae Asset Global ETFs Holdings Ltd. | 35,876 | $2.98M | 0.00% | +7,935+28.4% | Added |
| Fieldview Capital Management, LLC | 36,518 | $3.03M | 0.51% | +6,187+20.4% | Added |
| American Trust Investment Advisors, LLC | 36,624 | $3.04M | 1.62% | +294+0.8% | Added |
| Truist Financial Corp | 36,944 | $3.06M | 0.00% | −7,974−17.8% | Reduced |
| Vectors Research Management, LLC | 37,625 | $3.12M | 0.95% | −3,962−9.5% | Reduced |
| Spirit of America Management Corp | 37,850 | $3.14M | 0.67% | −1,100−2.8% | Reduced |
| Pacitti Group Inc. | 37,639 | $3.15M | 1.16% | +893+2.4% | Added |
| Janus Henderson Group PLC | 38,032 | $3.15M | 0.00% | +588+1.6% | Added |
| Rafferty Asset Management, LLC | 38,219 | $3.17M | 0.01% | −1,495−3.8% | Reduced |
| Pensionfund DSM Netherlands | 38,500 | $3.19M | 2.10% | 00.0% | Unchanged |
| Gotham Asset Management, LLC | 38,547 | $3.20M | 0.01% | −45,377−54.1% | Reduced |
| FIL Ltd | 38,714 | $3.21M | 0.00% | +34,440+805.8% | Added |
| Rakuten Investment Management, Inc. | 38,874 | $3.21M | 0.01% | +8,296+27.1% | Added |
| Squarepoint Ops LLC | 38,822 | $3.22M | 0.01% | −31,507−44.8% | Reduced |
| WealthTrust Axiom LLC | 39,347 | $3.26M | 0.84% | −3,011−7.1% | Reduced |
| Connor, Clark & Lunn Investment Management Ltd. | 39,394 | $3.27M | 0.01% | +12,277+45.3% | Added |
| Trinity Legacy Partners, LLC | 39,506 | $3.28M | 0.75% | +818+2.1% | Added |
| Holderness Investments Co | 40,724 | $3.38M | 0.69% | −692−1.7% | Reduced |
| Moors & Cabot, Inc. | 42,429 | $3.52M | 0.15% | −1,780−4.0% | Reduced |
| Steward Partners Investment Advisory, LLC | 42,875 | $3.56M | 0.02% | +2,526+6.3% | Added |
| New York Life Investment Management LLC | 43,058 | $3.57M | 0.03% | −116−0.3% | Reduced |
| JustInvest LLC | 44,142 | $3.66M | 0.04% | +5,102+13.1% | Added |
| Police & Firemen's Retirement System of New Jersey | 44,950 | $3.73M | 0.03% | −2,284−4.8% | Reduced |
| Yousif Capital Management, LLC | 41,206 | $3.81M | 0.04% | −4,651−10.1% | Reduced |
| Baird Financial Group, Inc. | 45,891 | $3.81M | 0.01% | −747−1.6% | Reduced |
| Twinbeech Capital LP | 45,900 | $3.81M | 0.27% | +45,900 | New |
| Royal Fund Management, LLC | 46,030 | $3.82M | 0.35% | +32,335+236.1% | Added |
| Thompson Siegel & Walmsley LLC | 46,300 | $3.84M | 0.06% | −40,100−46.4% | Reduced |
| Burney Co | 46,647 | $3.87M | 0.12% | −2,956−6.0% | Reduced |
| Dana Investment Advisors, Inc. | 47,137 | $3.91M | 0.11% | −98,404−67.6% | Reduced |
| RB Capital Management, LLC | 47,216 | $3.92M | 0.79% | +477+1.0% | Added |
| Sora Investors LLC | 47,345 | $3.93M | 0.34% | −52,974−52.8% | Reduced |
| Cerity Partners LLC | 48,012 | $3.98M | 0.01% | +9,825+25.7% | Added |
| Ethic Inc. | 48,277 | $4.00M | 0.06% | −435−0.9% | Reduced |
| Utah Retirement Systems | 48,479 | $4.02M | 0.04% | 00.0% | Unchanged |
| Advisors Asset Management, Inc. | 48,865 | $4.05M | 0.07% | −11,107−18.5% | Reduced |
| Xponance, Inc. | 48,894 | $4.06M | 0.03% | +2,710+5.9% | Added |
| Federation des caisses Desjardins du Quebec | 50,087 | $4.15M | 0.02% | +4,903+10.9% | Added |
| Woodline Partners LP | 50,353 | $4.18M | 0.02% | +11,395+29.2% | Added |
| QRG Capital Management, Inc. | 50,921 | $4.22M | 0.05% | −12,553−19.8% | Reduced |
| First National Trust Co | 51,263 | $4.25M | 0.14% | +240.0% | Added |
| Fjarde Ap-Fonden /Fourth Swedish National Pension Fund | 51,326 | $4.26M | 0.04% | +51,326 | New |
| Nia Impact Advisors, LLC | 51,974 | $4.31M | 1.45% | −1,193−2.2% | Reduced |
| Werlinich Asset Management, LLC | 51,907 | $4.33M | 2.13% | +95+0.2% | Added |
| British Columbia Investment Management Corp | 52,269 | $4.34M | 0.02% | +9,868+23.3% | Added |
| First Trust Advisors LP | 53,683 | $4.45M | 0.00% | −96,156−64.2% | Reduced |
| Reaves W H & Co Inc | 53,900 | $4.47M | 0.08% | +53,900 | New |
| Skandinaviska Enskilda Banken AB (publ) | 54,151 | $4.49M | 0.02% | −762−1.4% | Reduced |
| Amalgamated Bank | 54,985 | $4.56M | 0.03% | −1,113−2.0% | Reduced |
| Hennion & Walsh Asset Management, Inc. | 55,764 | $4.63M | 0.16% | −3,453−5.8% | Reduced |
| Wealth Enhancement Advisory Services, LLC | 54,584 | $4.64M | 0.01% | +5,565+11.4% | Added |
| Kempen Capital Management N.V. | 56,078 | $4.65M | 0.04% | −10,481−15.7% | Reduced |
| PensionDanmark Pensionsforsikringsaktieselskab | 57,150 | $4.74M | 0.04% | +57,150 | New |
| Man Group plc | 57,346 | $4.76M | 0.01% | +45,195+371.9% | Added |
| Peapack Gladstone Financial Corp | 57,698 | $4.79M | 0.06% | −1,875−3.1% | Reduced |
| Voya Investment Management LLC | 58,350 | $4.84M | 0.00% | −4,275−6.8% | Reduced |
| ASR Vermogensbeheer N.V. | 60,759 | $5.04M | 0.06% | −12,417−17.0% | Reduced |
| Candriam Luxembourg S.C.A. | 61,143 | $5.07M | 0.03% | +2,037+3.4% | Added |
| The PNC Financial Services Group, Inc. | 61,194 | $5.08M | 0.00% | −3,860−5.9% | Reduced |
| Swiss Life Asset Management Ltd | 61,348 | $5.09M | 0.03% | +5,940+10.7% | Added |
| Mirae Asset Global Investments Co., Ltd. | 61,911 | $5.14M | 0.01% | +11,129+21.9% | Added |
| Ieq Capital, LLC | 63,064 | $5.23M | 0.02% | +59,963+1,933.7% | Added |
| Mariner, LLC | 63,335 | $5.26M | 0.01% | +16,381+34.9% | Added |
| Woodstock Corp | 63,717 | $5.29M | 0.45% | +660+1.0% | Added |
| PFA Pension, Forsikringsaktieselskab | 63,474 | $5.29M | 0.02% | +63,474 | New |
| USS Investment Management Ltd | 64,572 | $5.35M | 0.03% | +4,732+7.9% | Added |
| Raiffeisen Bank International AG | 64,516 | $5.38M | 0.07% | +9,849+18.0% | Added |
| MML Investors Services, LLC | 65,167 | $5.41M | 0.01% | −1,740−2.6% | Reduced |
| Lee Danner & Bass Inc | 65,208 | $5.41M | 0.39% | +22,625+53.1% | Added |
| Northwestern Mutual Wealth Management Co | 65,941 | $5.47M | 0.00% | +1,553+2.4% | Added |