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 |
|---|---|---|---|---|---|
| Northern Trust Corp | 4,152,569 | $344.5M | 0.04% | +121,003+3.0% | Added |
| Principal Financial Group Inc | 4,207,596 | $349.0M | 0.18% | +1,680,438+66.5% | Added |
| Invesco Ltd. | 4,417,367 | $366.4M | 0.03% | −649,149−12.8% | Reduced |
| Dimensional Fund Advisors LP | 4,429,359 | $367.4M | 0.08% | +81,320+1.9% | Added |
| Norges Bank | 4,447,133 | $368.9M | 0.04% | +4,447,133 | New |
| FMR LLC | 7,984,304 | $662.3M | 0.03% | +126,212+1.6% | Added |
| Geode Capital Management, LLC | 8,292,653 | $685.4M | 0.04% | +102,073+1.2% | Added |
| State Street Corp | 16,888,798 | $1.42B | 0.05% | −242,989−1.4% | Reduced |
| Cohen & Steers, Inc. | 18,903,716 | $1.57B | 2.83% | +3,155,034+20.0% | Added |
| BlackRock, Inc. | 32,919,658 | $2.73B | 0.05% | +1,210,594+3.8% | Added |
| Vanguard Group Inc | 46,627,483 | $3.87B | 0.06% | −625,617−1.3% | Reduced |
| Dogwood Wealth Management LLC | 0 | $0 | 0.00% | −72−100.0% | Sold out |
| Bamco Inc | 0 | $0 | 0.00% | −436,831−100.0% | Sold out |
| Aew Capital Management L P | 0 | $0 | 0.00% | −315,257−100.0% | Sold out |
| Gillson Capital LP | 0 | $0 | 0.00% | −286,900−100.0% | Sold out |
| Capital Fund Management S.A. | 0 | $0 | 0.00% | −118,570−100.0% | Sold out |
| Waterfront Capital Partners, LLC | 0 | $0 | 0.00% | −115,286−100.0% | Sold out |
| Susquehanna Portfolio Strategies, LLC | 0 | $0 | 0.00% | −105,141−100.0% | Sold out |
| Summit Partners Public Asset Management, LLC | 0 | $0 | 0.00% | −85,000−100.0% | Sold out |
| Hudson Bay Capital Management LP | 0 | $0 | 0.00% | −80,657−100.0% | Sold out |
| Qube Research & Technologies Ltd | 0 | $0 | 0.00% | −38,654−100.0% | Sold out |
| Zacks Investment Management | 0 | $0 | 0.00% | −19,412−100.0% | Sold out |
| ING Groep NV | 0 | $0 | 0.00% | −17,304−100.0% | Sold out |
| Edgestream Partners, L.P. | 0 | $0 | 0.00% | −17,300−100.0% | Sold out |
| ExodusPoint Capital Management, LP | 0 | $0 | 0.00% | −13,038−100.0% | Sold out |
| Oak Thistle LLC | 0 | $0 | 0.00% | −11,980−100.0% | Sold out |
| NewSquare Capital LLC | 0 | $0 | 0.00% | −11,823−100.0% | Sold out |
| Catalytic Wealth RIA, LLC | 0 | $0 | 0.00% | −10,938−100.0% | Sold out |
| Jain Global LLC | 0 | $0 | 0.00% | −9,190−100.0% | Sold out |
| Perpetual Ltd | 0 | $0 | 0.00% | −9,130−100.0% | Sold out |
| Jump Financial, LLC | 0 | $0 | 0.00% | −9,017−100.0% | Sold out |
| Aspire Private Capital, LLC | 0 | $0 | 0.00% | −8,855−100.0% | Sold out |
| Aigen Investment Management, LP | 0 | $0 | 0.00% | −7,760−100.0% | Sold out |
| Two Sigma Securities, LLC | 0 | $0 | 0.00% | −7,256−100.0% | Sold out |
| Susquehanna Fundamental Investments, LLC | 0 | $0 | 0.00% | −6,739−100.0% | Sold out |
| Twin Tree Management, LP | 0 | $0 | 0.00% | −6,576−100.0% | Sold out |
| Caption Management, LLC | 0 | $0 | 0.00% | −6,400−100.0% | Sold out |
| Jackson Square Capital, LLC | 0 | $0 | 0.00% | −5,999−100.0% | Sold out |
| Arete Wealth Advisors, LLC | 0 | $0 | 0.00% | −5,150−100.0% | Sold out |
| NorthRock Partners, LLC | 0 | $0 | 0.00% | −4,774−100.0% | Sold out |
| GM Advisory Group, Inc. | 0 | $0 | 0.00% | −4,685−100.0% | Sold out |
| Pinnacle Associates Ltd | 0 | $0 | 0.00% | −4,219−100.0% | Sold out |
| Kovitz Investment Group Partners, LLC | 0 | $0 | 0.00% | −4,177−100.0% | Sold out |
| RMR Wealth Builders | 0 | $0 | 0.00% | −3,730−100.0% | Sold out |
| Strategic Investment Advisors | 0 | $0 | 0.00% | −3,706−100.0% | Sold out |
| CAPROCK Group, Inc. | 0 | $0 | 0.00% | −4,081−100.0% | Sold out |
| Strategic Blueprint, LLC | 0 | $0 | 0.00% | −3,645−100.0% | Sold out |
| Prosperity Consulting Group, LLC | 0 | $0 | 0.00% | −3,640−100.0% | Sold out |
| Jacobi Capital Management LLC | 0 | $0 | 0.00% | −3,279−100.0% | Sold out |
| Dynamic Advisor Solutions LLC | 0 | $0 | 0.00% | −3,101−100.0% | Sold out |
| Boothbay Fund Management, LLC | 0 | $0 | 0.00% | −3,034−100.0% | Sold out |
| Accuvest Global Advisors | 0 | $0 | 0.00% | −3,000−100.0% | Sold out |
| SeaCrest Wealth Management, LLC | 0 | $0 | 0.00% | −2,900−100.0% | Sold out |
| Flow Traders U.S. LLC | 0 | $0 | 0.00% | −2,931−100.0% | Sold out |
| Freestone Grove Partners LP | 0 | $0 | 0.00% | −2,798−100.0% | Sold out |
| Turtle Creek Wealth Advisors, LLC | 0 | $0 | 0.00% | −2,771−100.0% | Sold out |
| Diversified Trust Co | 0 | $0 | 0.00% | −2,764−100.0% | Sold out |
| Cardiff Park Advisors, LLC | 0 | $0 | 0.00% | −2,684−100.0% | Sold out |
| Change Path, LLC | 0 | $0 | 0.00% | −2,655−100.0% | Sold out |
| Camden Capital, LLC | 0 | $0 | 0.00% | −2,619−100.0% | Sold out |
| LaSalle St. Investment Advisors, LLC | 0 | $0 | 0.00% | −2,516−100.0% | Sold out |
| Farringdon Capital, Ltd. | 0 | $0 | 0.00% | −2,511−100.0% | Sold out |
| Fiduciary Planning LLC | 0 | $0 | 0.00% | −2,382−100.0% | Sold out |
| Fielder Capital Group LLC | 0 | $0 | 0.00% | −2,381−100.0% | Sold out |
| Bedel Financial Consulting, Inc. | 0 | $0 | 0.00% | −2,364−100.0% | Sold out |
| Schmidt P J Investment Management Inc | 0 | $0 | 0.00% | −2,360−100.0% | Sold out |
| Waldron Private Wealth LLC | 0 | $0 | 0.00% | −2,338−100.0% | Sold out |
| Wealth Alliance | 0 | $0 | 0.00% | −2,324−100.0% | Sold out |
| Intrua Financial, LLC | 0 | $0 | 0.00% | −2,319−100.0% | Sold out |
| HBK Sorce Advisory LLC | 0 | $0 | 0.00% | −2,233−100.0% | Sold out |
| Walleye Trading LLC | 0 | $0 | 0.00% | −2,305−100.0% | Sold out |
| Mayflower Financial Advisors, LLC | 0 | $0 | 0.00% | −2,287−100.0% | Sold out |
| Fayez Sarofim & Co | 0 | $0 | 0.00% | −2,280−100.0% | Sold out |
| Smith, Moore & Co. | 0 | $0 | 0.00% | −2,277−100.0% | Sold out |
| Waterloo Capital, L.P. | 0 | $0 | 0.00% | −2,272−100.0% | Sold out |
| Mystic Asset Management, Inc. | 0 | $0 | 0.00% | −2,239−100.0% | Sold out |
| Community Bank & Trust, Waco, Texas | 0 | $0 | 0.00% | −2,200−100.0% | Sold out |
| Avidian Wealth Solutions, LLC | 0 | $0 | 0.00% | −2,179−100.0% | Sold out |
| Valeo Financial Advisors, LLC | 0 | $0 | 0.00% | −2,173−100.0% | Sold out |
| Nations Financial Group Inc, | 0 | $0 | 0.00% | −2,161−100.0% | Sold out |
| Saxony Capital Management, LLC | 0 | $0 | 0.00% | −2,151−100.0% | Sold out |
| Brighton Jones LLC | 0 | $0 | 0.00% | −2,134−100.0% | Sold out |
| Stiles Financial Services Inc | 0 | $0 | 0.00% | −2,127−100.0% | Sold out |
| Warm Springs Advisors Inc. | 0 | $0 | 0.00% | −2,117−100.0% | Sold out |
| Ignite Planners, LLC | 0 | $0 | 0.00% | −2,097−100.0% | Sold out |
| Great Valley Advisor Group, Inc. | 0 | $0 | 0.00% | −2,090−100.0% | Sold out |
| Cassaday & Co Wealth Management LLC | 0 | $0 | 0.00% | −2,065−100.0% | Sold out |
| Texas Bank & Trust Co | 0 | $0 | 0.00% | −2,054−100.0% | Sold out |
| Channel Wealth LLC | 0 | $0 | 0.00% | −2,022−100.0% | Sold out |
| Affinity Investment Advisors, LLC | 0 | $0 | 0.00% | −2,013−100.0% | Sold out |
| Mosaic Family Wealth Partners, LLC | 0 | $0 | 0.00% | −2,040−100.0% | Sold out |
| Apriem Advisors | 0 | $0 | 0.00% | −2,007−100.0% | Sold out |
| Catalyst Capital Advisors LLC | 0 | $0 | 0.00% | −1,303−100.0% | Sold out |
| Evermay Wealth Management LLC | 0 | $0 | 0.00% | −1,141−100.0% | Sold out |
| Evolution Wealth Management Inc. | 0 | $0 | 0.00% | −960−100.0% | Sold out |
| Quarry LP | 0 | $0 | 0.00% | −852−100.0% | Sold out |
| Wealthspire Advisors, LLC | 0 | $0 | 0.00% | −824−100.0% | Sold out |
| Ci Investments Inc. | 0 | $0 | 0.00% | −808−100.0% | Sold out |
| City Holding Co | 0 | $0 | 0.00% | −667−100.0% | Sold out |
| JPL Wealth Management, LLC | 0 | $0 | 0.00% | −554−100.0% | Sold out |