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 |
|---|---|---|---|---|---|
| Mutual of America Capital Management LLC | 31,465 | $3.21M | 0.04% | −272−0.9% | Reduced |
| Norinchukin Bank, The | 31,441 | $3.21M | 0.04% | −370−1.2% | Reduced |
| Fideuram Asset Management (Ireland) dac | 28,988 | $3.18M | 0.41% | +28,891+29,784.5% | Added |
| OP Asset Management Ltd | 30,698 | $3.14M | 0.03% | −2,219−6.7% | Reduced |
| Siemens Fonds Invest GmbH | 30,654 | $3.13M | 0.18% | +2,284+8.1% | Added |
| Buckland Partners Management Co LLC | 30,000 | $3.09M | 1.87% | 00.0% | Unchanged |
| Burney Co | 30,068 | $3.07M | 0.10% | −16,579−35.5% | Reduced |
| One Capital Management, LLC | 30,034 | $3.07M | 0.08% | −471−1.5% | Reduced |
| Cyndeo Wealth Partners, LLC | 29,951 | $3.06M | 0.16% | +101+0.3% | Added |
| Heritage Trust Co | 29,798 | $3.04M | 0.31% | +1,992+7.2% | Added |
| Bessemer Group Inc | 29,560 | $3.02M | 0.00% | +909+3.2% | Added |
| J.W. Cole Advisors, Inc. | 29,450 | $3.01M | 0.10% | −1,407−4.6% | Reduced |
| Rafferty Asset Management, LLC | 29,108 | $2.97M | 0.01% | −9,111−23.8% | Reduced |
| Public Employees Retirement Association of Colorado | 28,336 | $2.89M | 0.01% | 00.0% | Unchanged |
| Mirae Asset Global ETFs Holdings Ltd. | 28,284 | $2.89M | 0.00% | −7,592−21.2% | Reduced |
| Dumont & Blake Investment Advisors LLC | 28,204 | $2.88M | 0.72% | −393−1.4% | Reduced |
| B. Metzler seel. Sohn & Co. AG | 27,812 | $2.84M | 0.03% | +1,313+5.0% | Added |
| US Bancorp | 27,280 | $2.79M | 0.00% | +2,853+11.7% | Added |
| Sage Capital Management, LLC | 26,692 | $2.73M | 1.28% | −518−1.9% | Reduced |
| Gradient Investments LLC | 26,439 | $2.70M | 0.04% | +26,439 | New |
| Entropy Technologies, LP | 26,399 | $2.70M | 0.12% | +20,785+370.2% | Added |
| Independent Advisor Alliance | 25,787 | $2.63M | 0.03% | −980−3.7% | Reduced |
| XTX Topco Ltd | 25,465 | $2.60M | 0.05% | +25,465 | New |
| NBC Securities, Inc. | 25,426 | $2.60M | 0.19% | +21,800+601.2% | Added |
| Meridian Wealth Advisors, LLC | 25,399 | $2.59M | 0.34% | +5,085+25.0% | Added |
| Merit Financial Group, LLC | 25,033 | $2.56M | 0.02% | +4,363+21.1% | Added |
| Park Avenue Securities LLC | 24,807 | $2.53M | 0.02% | +7,547+43.7% | Added |
| Vectors Research Management, LLC | 24,565 | $2.51M | 0.73% | −13,060−34.7% | Reduced |
| Toroso Investments, LLC | 24,263 | $2.48M | 0.01% | +10,521+76.6% | Added |
| Jain Global LLC | 24,108 | $2.46M | 0.03% | +24,108 | New |
| PFG Investments, LLC | 23,569 | $2.41M | 0.11% | −1,737−6.9% | Reduced |
| Corrado Advisors, LLC | 23,483 | $2.40M | 1.25% | +3,627+18.3% | Added |
| Westpac Banking Corp | 23,311 | $2.38M | 0.17% | −59−0.3% | Reduced |
| Susquehanna Portfolio Strategies, LLC | 23,278 | $2.38M | 0.04% | +23,278 | New |
| Capital Investment Advisors, LLC | 23,174 | $2.37M | 0.03% | +100+0.4% | Added |
| Empowered Funds, LLC | 23,082 | $2.36M | 0.02% | +15,357+198.8% | Added |
| Gulf International Bank (UK) Ltd | 22,970 | $2.35M | 0.05% | +8,121+54.7% | Added |
| Teachers Retirement System of the State of Kentucky | 22,954 | $2.35M | 0.02% | 00.0% | Unchanged |
| Fifth Third Bancorp | 22,940 | $2.34M | 0.00% | +150+0.7% | Added |
| Sippican Capital Advisors | 22,727 | $2.32M | 1.59% | −550−2.4% | Reduced |
| Avanza Fonder AB | 22,699 | $2.32M | 0.06% | 00.0% | Unchanged |
| CoreFirst Bank & Trust | 22,629 | $2.31M | 1.23% | −210−0.9% | Reduced |
| Nepsis, Inc. | 22,530 | $2.30M | 0.77% | −558−2.4% | Reduced |
| Allianz Asset Management GmbH | 22,278 | $2.28M | 0.00% | −13,086−37.0% | Reduced |
| Intech Investment Management LLC | 22,268 | $2.27M | 0.02% | −71,948−76.4% | Reduced |
| Naviter Wealth, LLC | 21,964 | $2.26M | 0.28% | +2,170+11.0% | Added |
| GeoWealth Management, LLC | 22,144 | $2.26M | 0.08% | +1,748+8.6% | Added |
| Erste Asset Management GmbH | 23,000 | $2.24M | 0.02% | +2,100+10.0% | Added |
| Brown Advisory Inc | 21,830 | $2.23M | 0.00% | +5,811+36.3% | Added |
| Benjamin Edwards Inc | 21,816 | $2.23M | 0.02% | −566−2.5% | Reduced |
| Stock Yards Bank & Trust Co | 21,739 | $2.22M | 0.07% | −728−3.2% | Reduced |
| Pasadena Private Wealth, LLC | 21,610 | $2.21M | 0.31% | −1,954−8.3% | Reduced |
| KCM Investment Advisors LLC | 21,311 | $2.18M | 0.07% | +10.0% | Added |
| MASTERINVEST Kapitalanlage GmbH | 21,228 | $2.17M | 0.23% | +1,511+7.7% | Added |
| Investment Management Corp of Ontario | 21,135 | $2.16M | 0.03% | −3,854−15.4% | Reduced |
| Ancora Advisors, LLC | 20,892 | $2.13M | 0.05% | −1,156−5.2% | Reduced |
| Lido Advisors, LLC | 20,708 | $2.13M | 0.01% | −507−2.4% | Reduced |
| Everence Capital Management Inc | 20,717 | $2.12M | 0.13% | 00.0% | Unchanged |
| Investor's Fiduciary Advisor Network, LLC | 20,627 | $2.11M | 0.65% | −2,096−9.2% | Reduced |
| Fiduciary Trust Co | 20,316 | $2.08M | 0.02% | −922−4.3% | Reduced |
| Pensionfund Sabic | 20,300 | $2.07M | 2.50% | +1,500+8.0% | Added |
| MAI Capital Management | 20,234 | $2.07M | 0.01% | +2,944+17.0% | Added |
| Edgestream Partners, L.P. | 20,057 | $2.05M | 0.07% | +20,057 | New |
| Oppenheimer Asset Management Inc. | 19,458 | $1.99M | 0.02% | −274−1.4% | Reduced |
| NewEdge Wealth, LLC | 19,365 | $1.98M | 0.02% | +5,663+41.3% | Added |
| Gables Capital Management Inc. | 19,342 | $1.98M | 0.84% | −950−4.7% | Reduced |
| GEM Realty Capital | 19,231 | $1.96M | 0.19% | +19,231 | New |
| Tower Research Capital LLC (TRC) | 19,177 | $1.96M | 0.05% | +14,656+324.2% | Added |
| Blue Sparrow, LLC | 19,130 | $1.95M | 0.03% | +19,130 | New |
| AG2R la Mondiale Gestion D'Actifs | 18,963 | $1.94M | 0.09% | −2,893−13.2% | Reduced |
| Kentucky Trust Co | 18,865 | $1.93M | 1.01% | −200−1.0% | Reduced |
| Horizon Kinetics Asset Management LLC | 18,405 | $1.88M | 0.02% | 00.0% | Unchanged |
| Courier Capital LLC | 18,021 | $1.84M | 0.10% | −9,589−34.7% | Reduced |
| Wolverine Asset Management LLC | 17,932 | $1.83M | 0.03% | −5,900−24.8% | Reduced |
| Mizuho Securities USA LLC | 17,885 | $1.83M | 0.04% | −3,638−16.9% | Reduced |
| Cascade Investment Group, Inc. | 17,781 | $1.82M | 1.20% | −1,450−7.5% | Reduced |
| Inspire Trust Co, N.A. | 17,559 | $1.79M | 0.28% | −2,441−12.2% | Reduced |
| Capital Financial Group Inc | 17,472 | $1.78M | 0.98% | +477+2.8% | Added |
| Summit Trail Advisors, LLC | 17,438 | $1.78M | 0.03% | +2,457+16.4% | Added |
| Twinbeech Capital LP | 17,400 | $1.78M | 0.18% | −28,500−62.1% | Reduced |
| Madison Asset Management, LLC | 17,052 | $1.74M | 0.02% | 00.0% | Unchanged |
| RFG Advisory, LLC | 16,998 | $1.74M | 0.03% | −1,533−8.3% | Reduced |
| Hartford Investment Management Co | 16,879 | $1.72M | 0.05% | −201−1.2% | Reduced |
| Claro Advisors LLC | 16,739 | $1.71M | 0.21% | +224+1.4% | Added |
| Crescent Grove Advisors, LLC | 16,054 | $1.71M | 0.17% | +2,799+21.1% | Added |
| DRW Securities, LLC | 16,414 | $1.68M | 0.09% | +11,807+256.3% | Added |
| Commerce Bank | 16,393 | $1.67M | 0.01% | +209+1.3% | Added |
| Integrated Wealth Concepts LLC | 16,363 | $1.67M | 0.01% | +9,825+150.3% | Added |
| Pensionmark Financial Group, LLC | 16,285 | $1.66M | 0.03% | +2,405+17.3% | Added |
| Snowden Capital Advisors LLC | 15,834 | $1.63M | 0.04% | +1,105+7.5% | Added |
| Community Bank of Raymore | 15,871 | $1.62M | 1.09% | +630+4.1% | Added |
| Crossmark Global Holdings, Inc. | 15,818 | $1.62M | 0.02% | −210−1.3% | Reduced |
| Abn Amro Investment Solutions | 15,813 | $1.62M | 0.02% | −404−2.5% | Reduced |
| Royal Fund Management, LLC | 15,649 | $1.60M | 0.15% | −30,381−66.0% | Reduced |
| HB Wealth Management, LLC | 15,406 | $1.57M | 0.01% | +3,579+30.3% | Added |
| King Luther Capital Management Corp | 15,302 | $1.56M | 0.01% | −627−3.9% | Reduced |
| DoubleLine ETF Adviser LP | 15,281 | $1.56M | 0.59% | −3,794−19.9% | Reduced |
| Kestra Private Wealth Services, LLC | 15,153 | $1.55M | 0.02% | +701+4.9% | Added |
| Louisiana State Employees Retirement System | 15,100 | $1.54M | 0.03% | 00.0% | Unchanged |
| Havemeyer Place LP | 15,077 | $1.54M | 0.18% | +5,689+60.6% | Added |