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 |
|---|---|---|---|---|---|
| Nordea Investment Management AB | 68,437 | $6.91M | 0.01% | +4,523+7.1% | Added |
| Mercer Global Advisors Inc | 67,516 | $6.88M | 0.01% | −13,754−16.9% | Reduced |
| Susquehanna International Group, LLP | 67,243 | $6.85M | 0.01% | −56,527−45.7% | Reduced |
| MML Investors Services, LLC | 66,907 | $6.82M | 0.02% | −11,857−15.1% | Reduced |
| Kempen Capital Management N.V. | 66,559 | $6.79M | 0.06% | −6,874−9.4% | Reduced |
| The PNC Financial Services Group, Inc. | 65,054 | $6.63M | 0.00% | −332−0.5% | Reduced |
| Northwestern Mutual Wealth Management Co | 64,388 | $6.56M | 0.00% | +4,158+6.9% | Added |
| Public Sector Pension Investment Board | 63,680 | $6.49M | 0.02% | +3,008+5.0% | Added |
| QRG Capital Management, Inc. | 63,474 | $6.47M | 0.08% | −75,498−54.3% | Reduced |
| Woodstock Corp | 63,057 | $6.43M | 0.56% | +7,679+13.9% | Added |
| Lighthouse Investment Partners, LLC | 63,000 | $6.42M | 0.23% | +12,800+25.5% | Added |
| Voya Investment Management LLC | 62,625 | $6.38M | 0.01% | −19,025−23.3% | Reduced |
| Acadian Asset Management LLC | 62,416 | $6.36M | 0.01% | +60,407+3,006.8% | Added |
| ProShare Advisors LLC | 61,866 | $6.31M | 0.01% | +996+1.6% | Added |
| Citadel Advisors LLC | 61,291 | $6.25M | 0.01% | −78,500−56.2% | Reduced |
| State of Tennessee, Treasury Department | 60,669 | $6.18M | 0.02% | −39,428−39.4% | Reduced |
| Advisors Asset Management, Inc. | 59,972 | $6.11M | 0.10% | −3,539−5.6% | Reduced |
| USS Investment Management Ltd | 59,840 | $6.10M | 0.03% | 00.0% | Unchanged |
| Peapack Gladstone Financial Corp | 59,573 | $6.07M | 0.08% | +3,488+6.2% | Added |
| Hennion & Walsh Asset Management, Inc. | 59,217 | $6.04M | 0.22% | +889+1.5% | Added |
| Candriam Luxembourg S.C.A. | 59,106 | $6.03M | 0.03% | −12,617−17.6% | Reduced |
| M&T Bank Corp | 58,861 | $6.00M | 0.02% | −27,466−31.8% | Reduced |
| DnB Asset Management AS | 56,983 | $5.81M | 0.02% | +2,951+5.5% | Added |
| Amalgamated Bank | 56,098 | $5.72M | 0.04% | −973−1.7% | Reduced |
| Swiss Life Asset Management Ltd | 55,408 | $5.65M | 0.03% | +8,821+18.9% | Added |
| Skandinaviska Enskilda Banken AB (publ) | 54,913 | $5.60M | 0.02% | −4,082−6.9% | Reduced |
| Raiffeisen Bank International AG | 54,667 | $5.49M | 0.07% | +8,327+18.0% | Added |
| Korea Investment CORP | 53,549 | $5.46M | 0.01% | −221,921−80.6% | Reduced |
| Nia Impact Advisors, LLC | 53,167 | $5.42M | 1.76% | +665+1.3% | Added |
| Werlinich Asset Management, LLC | 51,812 | $5.28M | 2.62% | 00.0% | Unchanged |
| First National Trust Co | 51,239 | $5.22M | 0.18% | −3,467−6.3% | Reduced |
| Wealth Enhancement Advisory Services, LLC | 49,019 | $5.19M | 0.01% | −1,231−2.4% | Reduced |
| Mirae Asset Global Investments Co., Ltd. | 50,782 | $5.18M | 0.02% | +5,913+13.2% | Added |
| Vestcor Inc | 50,559 | $5.15M | 0.15% | +16,347+47.8% | Added |
| Burney Co | 49,603 | $5.06M | 0.16% | −17,206−25.8% | Reduced |
| Ethic Inc. | 48,712 | $4.97M | 0.08% | −4,952−9.2% | Reduced |
| Utah Retirement Systems | 48,479 | $4.94M | 0.05% | +430+0.9% | Added |
| Police & Firemen's Retirement System of New Jersey | 47,234 | $4.82M | 0.04% | +2,865+6.5% | Added |
| Mariner, LLC | 46,954 | $4.79M | 0.01% | +1,299+2.8% | Added |
| RB Capital Management, LLC | 46,739 | $4.76M | 0.99% | +1,120+2.5% | Added |
| Baird Financial Group, Inc. | 46,638 | $4.75M | 0.01% | −2,032−4.2% | Reduced |
| Xponance, Inc. | 46,184 | $4.71M | 0.04% | +170.0% | Added |
| Yousif Capital Management, LLC | 45,857 | $4.67M | 0.05% | −3,017−6.2% | Reduced |
| Federation des caisses Desjardins du Quebec | 45,184 | $4.61M | 0.02% | −1,462−3.1% | Reduced |
| Truist Financial Corp | 44,918 | $4.58M | 0.01% | +2,676+6.3% | Added |
| Moors & Cabot, Inc. | 44,209 | $4.51M | 0.20% | −6,065−12.1% | Reduced |
| Allianz Asset Management GmbH | 43,274 | $4.41M | 0.01% | −1,912−4.2% | Reduced |
| New York Life Investment Management LLC | 43,174 | $4.40M | 0.04% | −1,078−2.4% | Reduced |
| CIBC Asset Management Inc | 42,791 | $4.36M | 0.01% | +1,744+4.2% | Added |
| Lee Danner & Bass Inc | 42,583 | $4.34M | 0.32% | +883+2.1% | Added |
| British Columbia Investment Management Corp | 42,401 | $4.32M | 0.02% | −3,814−8.3% | Reduced |
| WealthTrust Axiom LLC | 42,358 | $4.32M | 1.16% | −291−0.7% | Reduced |
| Vectors Research Management, LLC | 41,587 | $4.24M | 1.34% | +767+1.9% | Added |
| Holderness Investments Co | 41,416 | $4.22M | 0.86% | −412−1.0% | Reduced |
| Natixis | 40,921 | $4.17M | 0.02% | +28,563+231.1% | Added |
| Steward Partners Investment Advisory, LLC | 40,349 | $4.11M | 0.02% | +1,964+5.1% | Added |
| Rafferty Asset Management, LLC | 39,714 | $4.05M | 0.01% | +2,324+6.2% | Added |
| JustInvest LLC | 39,040 | $3.99M | 0.04% | +1,054+2.8% | Added |
| Trinity Legacy Partners, LLC | 38,688 | $3.98M | 0.92% | +222+0.6% | Added |
| Siemens Fonds Invest GmbH | 38,958 | $3.97M | 0.22% | +7,013+22.0% | Added |
| Woodline Partners LP | 38,958 | $3.97M | 0.02% | +7,119+22.4% | Added |
| Spirit of America Management Corp | 38,950 | $3.97M | 0.80% | −4,300−9.9% | Reduced |
| Qube Research & Technologies Ltd | 38,654 | $3.94M | 0.01% | −171,316−81.6% | Reduced |
| Teacher Retirement System of Texas | 38,638 | $3.94M | 0.02% | −5,970−13.4% | Reduced |
| Pensionfund DSM Netherlands | 38,500 | $3.92M | 2.54% | 00.0% | Unchanged |
| Cerity Partners LLC | 38,187 | $3.89M | 0.01% | +2,895+8.2% | Added |
| Janus Henderson Group PLC | 37,444 | $3.82M | 0.00% | −16,693−30.8% | Reduced |
| O'Shaughnessy Asset Management, LLC | 37,104 | $3.78M | 0.02% | +578+1.6% | Added |
| Pacitti Group Inc. | 36,746 | $3.77M | 1.46% | +1,499+4.3% | Added |
| American Trust Investment Advisors, LLC | 36,330 | $3.70M | 1.91% | −17,890−33.0% | Reduced |
| Pathstone Holdings, LLC | 35,262 | $3.60M | 0.01% | −1,226−3.4% | Reduced |
| Intact Investment Management Inc. | 35,200 | $3.59M | 0.11% | +35,200 | New |
| Cyndeo Wealth Partners, LLC | 34,228 | $3.49M | 0.19% | +10.0% | Added |
| Warren Averett Asset Management, LLC | 33,989 | $3.46M | 0.03% | +3,525+11.6% | Added |
| Hourglass Capital, LLC | 33,860 | $3.45M | 0.78% | −200−0.6% | Reduced |
| Oregon Public Employees Retirement Fund | 33,789 | $3.44M | 0.04% | +8,320+32.7% | Added |
| J.W. Cole Advisors, Inc. | 33,596 | $3.42M | 0.07% | +11,893+54.8% | Added |
| Venture Visionary Partners LLC | 33,180 | $3.38M | 0.12% | +191+0.6% | Added |
| OP Asset Management Ltd | 32,634 | $3.33M | 0.04% | +1,861+6.0% | Added |
| Banque Cantonale Vaudoise | 32,564 | $3.32M | 0.12% | −2,729−7.7% | Reduced |
| Smithfield Trust Co | 32,427 | $3.31M | 0.15% | −142−0.4% | Reduced |
| Mutual of America Capital Management LLC | 32,014 | $3.26M | 0.03% | −1,819−5.4% | Reduced |
| One Capital Management, LLC | 31,657 | $3.23M | 0.10% | −906−2.8% | Reduced |
| Tredje AP-fonden | 31,287 | $3.19M | 0.03% | +8,230+35.7% | Added |
| Norinchukin Bank, The | 31,092 | $3.17M | 0.04% | +496+1.6% | Added |
| Mackenzie Financial Corp | 30,798 | $3.14M | 0.00% | +990+3.3% | Added |
| Courier Capital LLC | 30,671 | $3.13M | 0.18% | −241−0.8% | Reduced |
| Fieldview Capital Management, LLC | 30,331 | $3.09M | 0.51% | +30,331 | New |
| Elo Mutual Pension Insurance Co | 30,150 | $3.07M | 0.05% | +3,217+11.9% | Added |
| Dumont & Blake Investment Advisors LLC | 29,896 | $3.05M | 0.74% | −338−1.1% | Reduced |
| D.A. Davidson & Co. | 29,870 | $3.05M | 0.02% | +338+1.1% | Added |
| Knights of Columbus Asset Advisors LLC | 29,802 | $3.04M | 0.17% | −36,819−55.3% | Reduced |
| B. Metzler seel. Sohn & Co. AG | 29,635 | $3.02M | 0.03% | 00.0% | Unchanged |
| Sage Capital Management, LLC | 29,205 | $2.98M | 1.34% | +127+0.4% | Added |
| Public Employees Retirement Association of Colorado | 28,336 | $2.89M | 0.01% | −626−2.2% | Reduced |
| GWM Advisors LLC | 28,072 | $2.86M | 0.01% | −4,574−14.0% | Reduced |
| Mirae Asset Global ETFs Holdings Ltd. | 27,941 | $2.85M | 0.00% | −1,902−6.4% | Reduced |
| Verition Fund Management LLC | 27,900 | $2.84M | 0.02% | +4,445+19.0% | Added |
| Connor, Clark & Lunn Investment Management Ltd. | 27,117 | $2.76M | 0.01% | −3,233−10.7% | Reduced |
| Independent Advisor Alliance | 26,706 | $2.72M | 0.07% | −426−1.6% | Reduced |