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 |
|---|---|---|---|---|---|
| Snowden Capital Advisors LLC | 15,834 | $1.63M | 0.04% | +1,105+7.5% | Added |
| Pensionmark Financial Group, LLC | 16,285 | $1.66M | 0.03% | +2,405+17.3% | Added |
| Integrated Wealth Concepts LLC | 16,363 | $1.67M | 0.01% | +9,825+150.3% | Added |
| Commerce Bank | 16,393 | $1.67M | 0.01% | +209+1.3% | Added |
| DRW Securities, LLC | 16,414 | $1.68M | 0.09% | +11,807+256.3% | Added |
| Crescent Grove Advisors, LLC | 16,054 | $1.71M | 0.17% | +2,799+21.1% | Added |
| Claro Advisors LLC | 16,739 | $1.71M | 0.21% | +224+1.4% | Added |
| Hartford Investment Management Co | 16,879 | $1.72M | 0.05% | −201−1.2% | Reduced |
| RFG Advisory, LLC | 16,998 | $1.74M | 0.03% | −1,533−8.3% | Reduced |
| Madison Asset Management, LLC | 17,052 | $1.74M | 0.02% | 00.0% | Unchanged |
| Twinbeech Capital LP | 17,400 | $1.78M | 0.18% | −28,500−62.1% | Reduced |
| Summit Trail Advisors, LLC | 17,438 | $1.78M | 0.03% | +2,457+16.4% | Added |
| Capital Financial Group Inc | 17,472 | $1.78M | 0.98% | +477+2.8% | Added |
| Inspire Trust Co, N.A. | 17,559 | $1.79M | 0.28% | −2,441−12.2% | Reduced |
| Cascade Investment Group, Inc. | 17,781 | $1.82M | 1.20% | −1,450−7.5% | Reduced |
| Mizuho Securities USA LLC | 17,885 | $1.83M | 0.04% | −3,638−16.9% | Reduced |
| Wolverine Asset Management LLC | 17,932 | $1.83M | 0.03% | −5,900−24.8% | Reduced |
| Courier Capital LLC | 18,021 | $1.84M | 0.10% | −9,589−34.7% | Reduced |
| Horizon Kinetics Asset Management LLC | 18,405 | $1.88M | 0.02% | 00.0% | Unchanged |
| Kentucky Trust Co | 18,865 | $1.93M | 1.01% | −200−1.0% | Reduced |
| AG2R la Mondiale Gestion D'Actifs | 18,963 | $1.94M | 0.09% | −2,893−13.2% | Reduced |
| Blue Sparrow, LLC | 19,130 | $1.95M | 0.03% | +19,130 | New |
| Tower Research Capital LLC (TRC) | 19,177 | $1.96M | 0.05% | +14,656+324.2% | Added |
| GEM Realty Capital | 19,231 | $1.96M | 0.19% | +19,231 | New |
| Gables Capital Management Inc. | 19,342 | $1.98M | 0.84% | −950−4.7% | Reduced |
| NewEdge Wealth, LLC | 19,365 | $1.98M | 0.02% | +5,663+41.3% | Added |
| Oppenheimer Asset Management Inc. | 19,458 | $1.99M | 0.02% | −274−1.4% | Reduced |
| Edgestream Partners, L.P. | 20,057 | $2.05M | 0.07% | +20,057 | New |
| MAI Capital Management | 20,234 | $2.07M | 0.01% | +2,944+17.0% | Added |
| Pensionfund Sabic | 20,300 | $2.07M | 2.50% | +1,500+8.0% | Added |
| Fiduciary Trust Co | 20,316 | $2.08M | 0.02% | −922−4.3% | Reduced |
| Investor's Fiduciary Advisor Network, LLC | 20,627 | $2.11M | 0.65% | −2,096−9.2% | Reduced |
| Everence Capital Management Inc | 20,717 | $2.12M | 0.13% | 00.0% | Unchanged |
| Lido Advisors, LLC | 20,708 | $2.13M | 0.01% | −507−2.4% | Reduced |
| Ancora Advisors, LLC | 20,892 | $2.13M | 0.05% | −1,156−5.2% | Reduced |
| Investment Management Corp of Ontario | 21,135 | $2.16M | 0.03% | −3,854−15.4% | Reduced |
| MASTERINVEST Kapitalanlage GmbH | 21,228 | $2.17M | 0.23% | +1,511+7.7% | Added |
| KCM Investment Advisors LLC | 21,311 | $2.18M | 0.07% | +10.0% | Added |
| Pasadena Private Wealth, LLC | 21,610 | $2.21M | 0.31% | −1,954−8.3% | Reduced |
| Stock Yards Bank & Trust Co | 21,739 | $2.22M | 0.07% | −728−3.2% | Reduced |
| Benjamin Edwards Inc | 21,816 | $2.23M | 0.02% | −566−2.5% | Reduced |
| Brown Advisory Inc | 21,830 | $2.23M | 0.00% | +5,811+36.3% | Added |
| Erste Asset Management GmbH | 23,000 | $2.24M | 0.02% | +2,100+10.0% | Added |
| GeoWealth Management, LLC | 22,144 | $2.26M | 0.08% | +1,748+8.6% | Added |
| Naviter Wealth, LLC | 21,964 | $2.26M | 0.28% | +2,170+11.0% | Added |
| Intech Investment Management LLC | 22,268 | $2.27M | 0.02% | −71,948−76.4% | Reduced |
| Allianz Asset Management GmbH | 22,278 | $2.28M | 0.00% | −13,086−37.0% | Reduced |
| Nepsis, Inc. | 22,530 | $2.30M | 0.77% | −558−2.4% | Reduced |
| CoreFirst Bank & Trust | 22,629 | $2.31M | 1.23% | −210−0.9% | Reduced |
| Avanza Fonder AB | 22,699 | $2.32M | 0.06% | 00.0% | Unchanged |
| Sippican Capital Advisors | 22,727 | $2.32M | 1.59% | −550−2.4% | Reduced |
| Fifth Third Bancorp | 22,940 | $2.34M | 0.00% | +150+0.7% | Added |
| Teachers Retirement System of the State of Kentucky | 22,954 | $2.35M | 0.02% | 00.0% | Unchanged |
| Gulf International Bank (UK) Ltd | 22,970 | $2.35M | 0.05% | +8,121+54.7% | Added |
| Empowered Funds, LLC | 23,082 | $2.36M | 0.02% | +15,357+198.8% | Added |
| Capital Investment Advisors, LLC | 23,174 | $2.37M | 0.03% | +100+0.4% | Added |
| Susquehanna Portfolio Strategies, LLC | 23,278 | $2.38M | 0.04% | +23,278 | New |
| Westpac Banking Corp | 23,311 | $2.38M | 0.17% | −59−0.3% | Reduced |
| Corrado Advisors, LLC | 23,483 | $2.40M | 1.25% | +3,627+18.3% | Added |
| PFG Investments, LLC | 23,569 | $2.41M | 0.11% | −1,737−6.9% | Reduced |
| Jain Global LLC | 24,108 | $2.46M | 0.03% | +24,108 | New |
| Toroso Investments, LLC | 24,263 | $2.48M | 0.01% | +10,521+76.6% | Added |
| Vectors Research Management, LLC | 24,565 | $2.51M | 0.73% | −13,060−34.7% | Reduced |
| Park Avenue Securities LLC | 24,807 | $2.53M | 0.02% | +7,547+43.7% | Added |
| Merit Financial Group, LLC | 25,033 | $2.56M | 0.02% | +4,363+21.1% | Added |
| Meridian Wealth Advisors, LLC | 25,399 | $2.59M | 0.34% | +5,085+25.0% | Added |
| NBC Securities, Inc. | 25,426 | $2.60M | 0.19% | +21,800+601.2% | Added |
| XTX Topco Ltd | 25,465 | $2.60M | 0.05% | +25,465 | New |
| Independent Advisor Alliance | 25,787 | $2.63M | 0.03% | −980−3.7% | Reduced |
| Entropy Technologies, LP | 26,399 | $2.70M | 0.12% | +20,785+370.2% | Added |
| Gradient Investments LLC | 26,439 | $2.70M | 0.04% | +26,439 | New |
| Sage Capital Management, LLC | 26,692 | $2.73M | 1.28% | −518−1.9% | Reduced |
| US Bancorp | 27,280 | $2.79M | 0.00% | +2,853+11.7% | Added |
| B. Metzler seel. Sohn & Co. AG | 27,812 | $2.84M | 0.03% | +1,313+5.0% | Added |
| Dumont & Blake Investment Advisors LLC | 28,204 | $2.88M | 0.72% | −393−1.4% | Reduced |
| Mirae Asset Global ETFs Holdings Ltd. | 28,284 | $2.89M | 0.00% | −7,592−21.2% | Reduced |
| Public Employees Retirement Association of Colorado | 28,336 | $2.89M | 0.01% | 00.0% | Unchanged |
| Rafferty Asset Management, LLC | 29,108 | $2.97M | 0.01% | −9,111−23.8% | Reduced |
| J.W. Cole Advisors, Inc. | 29,450 | $3.01M | 0.10% | −1,407−4.6% | Reduced |
| Bessemer Group Inc | 29,560 | $3.02M | 0.00% | +909+3.2% | Added |
| Heritage Trust Co | 29,798 | $3.04M | 0.31% | +1,992+7.2% | Added |
| Cyndeo Wealth Partners, LLC | 29,951 | $3.06M | 0.16% | +101+0.3% | Added |
| One Capital Management, LLC | 30,034 | $3.07M | 0.08% | −471−1.5% | Reduced |
| Burney Co | 30,068 | $3.07M | 0.10% | −16,579−35.5% | Reduced |
| Buckland Partners Management Co LLC | 30,000 | $3.09M | 1.87% | 00.0% | Unchanged |
| Siemens Fonds Invest GmbH | 30,654 | $3.13M | 0.18% | +2,284+8.1% | Added |
| OP Asset Management Ltd | 30,698 | $3.14M | 0.03% | −2,219−6.7% | Reduced |
| Fideuram Asset Management (Ireland) dac | 28,988 | $3.18M | 0.41% | +28,891+29,784.5% | Added |
| Norinchukin Bank, The | 31,441 | $3.21M | 0.04% | −370−1.2% | Reduced |
| Mutual of America Capital Management LLC | 31,465 | $3.21M | 0.04% | −272−0.9% | Reduced |
| Andra AP-fonden | 31,552 | $3.22M | 0.04% | −169,748−84.3% | Reduced |
| Knights of Columbus Asset Advisors LLC | 31,649 | $3.23M | 0.18% | 00.0% | Unchanged |
| Allstate Corp | 31,714 | $3.24M | 0.03% | +9,287+41.4% | Added |
| Smithfield Trust Co | 31,715 | $3.24M | 0.14% | −464−1.4% | Reduced |
| Janus Henderson Group PLC | 33,266 | $3.40M | 0.00% | −4,766−12.5% | Reduced |
| Y-Intercept (Hong Kong) Ltd | 33,654 | $3.44M | 0.07% | +9,382+38.7% | Added |
| Oregon Public Employees Retirement Fund | 33,889 | $3.46M | 0.05% | +100+0.3% | Added |
| Truist Financial Corp | 34,031 | $3.48M | 0.00% | −2,913−7.9% | Reduced |
| Mackenzie Financial Corp | 35,592 | $3.64M | 0.00% | +2,841+8.7% | Added |
| Warren Averett Asset Management, LLC | 36,018 | $3.68M | 0.03% | +1,596+4.6% | Added |