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 |
|---|---|---|---|---|---|
| Principal Financial Group Inc | 2,527,158 | $257.6M | 0.13% | −57,698−2.2% | Reduced |
| Deutsche Bank AG | 2,890,451 | $294.7M | 0.10% | −539,030−15.7% | Reduced |
| Daiwa Securities Group Inc. | 3,151,088 | $321.2M | 1.08% | +196,161+6.6% | Added |
| UBS Asset Management Americas Inc | 3,161,589 | $322.3M | 0.07% | +2,708,560+597.9% | Added |
| Contour Asset Management LLC | 3,165,830 | $322.7M | 8.09% | +830,482+35.6% | Added |
| Legal & General Group Plc | 3,215,455 | $327.8M | 0.07% | −67,821−2.1% | Reduced |
| Morgan Stanley | 3,611,399 | $368.1M | 0.02% | +104,916+3.0% | Added |
| Charles Schwab Investment Management Inc | 3,674,245 | $374.6M | 0.06% | +48,437+1.3% | Added |
| Northern Trust Corp | 4,031,566 | $411.0M | 0.05% | −36,242−0.9% | Reduced |
| Dimensional Fund Advisors LP | 4,348,039 | $443.2M | 0.10% | +55,273+1.3% | Added |
| Invesco Ltd. | 5,066,516 | $516.5M | 0.08% | +776,933+18.1% | Added |
| FMR LLC | 7,858,092 | $801.1M | 0.04% | +1,160,673+17.3% | Added |
| Geode Capital Management, LLC | 8,190,580 | $831.7M | 0.05% | +103,862+1.3% | Added |
| Cohen & Steers, Inc. | 15,748,682 | $1.61B | 2.90% | +1,980,051+14.4% | Added |
| State Street Corp | 17,131,787 | $1.76B | 0.06% | +322,144+1.9% | Added |
| BlackRock, Inc. | 31,709,064 | $3.23B | 0.06% | +430,437+1.4% | Added |
| Vanguard Group Inc | 47,253,100 | $4.82B | 0.07% | +188,213+0.4% | Added |
| Clark Wealth Partners | 0 | $0 | 0.00% | −15−100.0% | Sold out |
| Zurich Insurance Group Ltd | 0 | $0 | 0.00% | −513,791−100.0% | Sold out |
| Voloridge Investment Management, LLC | 0 | $0 | 0.00% | −382,076−100.0% | Sold out |
| Jane Street Group, LLC | 0 | $0 | 0.00% | −149,864−100.0% | Sold out |
| SG Americas Securities, LLC | 0 | $0 | 0.00% | −125,316−100.0% | Sold out |
| Employees Retirement System of Texas | 0 | $0 | 0.00% | −117,324−100.0% | Sold out |
| Weiss Asset Management LP | 0 | $0 | 0.00% | −108,426−100.0% | Sold out |
| AXA S.A. | 0 | $0 | 0.00% | −101,843−100.0% | Sold out |
| HRT Financial LP | 0 | $0 | 0.00% | −83,708−100.0% | Sold out |
| Eisler Capital Management Ltd. | 0 | $0 | 0.00% | −73,981−100.0% | Sold out |
| Brevan Howard Capital Management LP | 0 | $0 | 0.00% | −61,532−100.0% | Sold out |
| Fjarde Ap-Fonden /Fourth Swedish National Pension Fund | 0 | $0 | 0.00% | −50,784−100.0% | Sold out |
| Promethos Capital, LLC | 0 | $0 | 0.00% | −50,782−100.0% | Sold out |
| Prevail Innovative Wealth Advisors, LLC | 0 | $0 | 0.00% | −46,555−100.0% | Sold out |
| Alberta Investment Management Corp | 0 | $0 | 0.00% | −44,900−100.0% | Sold out |
| Tudor Investment Corp Et Al | 0 | $0 | 0.00% | −29,141−100.0% | Sold out |
| Fox Run Management, L.L.C. | 0 | $0 | 0.00% | −25,922−100.0% | Sold out |
| Y-Intercept (Hong Kong) Ltd | 0 | $0 | 0.00% | −21,031−100.0% | Sold out |
| Aster Capital Management (DIFC) Ltd | 0 | $0 | 0.00% | −19,478−100.0% | Sold out |
| Quantbot Technologies LP | 0 | $0 | 0.00% | −17,498−100.0% | Sold out |
| Virtu Financial LLC | 0 | $0 | 0.00% | −11,037−100.0% | Sold out |
| Private Advisory Group LLC | 0 | $0 | 0.00% | −10,236−100.0% | Sold out |
| Genesee Capital Advisors, LLC | 0 | $0 | 0.00% | −8,943−100.0% | Sold out |
| Capstone Investment Advisors, LLC | 0 | $0 | 0.00% | −8,636−100.0% | Sold out |
| V-Square Quantitative Management LLC | 0 | $0 | 0.00% | −8,375−100.0% | Sold out |
| Quantessence Capital LLC | 0 | $0 | 0.00% | −7,978−100.0% | Sold out |
| Foundations Investment Advisors, LLC | 0 | $0 | 0.00% | −7,776−100.0% | Sold out |
| Mangrove Partners | 0 | $0 | 0.00% | −7,088−100.0% | Sold out |
| Landscape Capital Management, L.L.C. | 0 | $0 | 0.00% | −6,742−100.0% | Sold out |
| Alyeska Investment Group, L.P. | 0 | $0 | 0.00% | −6,689−100.0% | Sold out |
| Illinois Municipal Retirement Fund | 0 | $0 | 0.00% | −6,529−100.0% | Sold out |
| Laurion Capital Management LP | 0 | $0 | 0.00% | −5,938−100.0% | Sold out |
| CTC Alternative Strategies, Ltd. | 0 | $0 | 0.00% | −4,795−100.0% | Sold out |
| Catalyst Funds Management Pty Ltd | 0 | $0 | 0.00% | −4,643−100.0% | Sold out |
| Eqis Capital Management, Inc. | 0 | $0 | 0.00% | −4,267−100.0% | Sold out |
| L.M. Kohn & Company | 0 | $0 | 0.00% | −4,147−100.0% | Sold out |
| Centiva Capital, LP | 0 | $0 | 0.00% | −4,031−100.0% | Sold out |
| Highland Capital Management Fund Advisors, L.P. | 0 | $0 | 0.00% | −3,800−100.0% | Sold out |
| SummitTX Capital, L.P. | 0 | $0 | 0.00% | −3,700−100.0% | Sold out |
| Gsa Capital Partners LLP | 0 | $0 | 0.00% | −3,548−100.0% | Sold out |
| Empirical Financial Services, LLC d.b.a. Empirical Wealth Management | 0 | $0 | 0.00% | −3,405−100.0% | Sold out |
| EntryPoint Capital, LLC | 0 | $0 | 0.00% | −3,007−100.0% | Sold out |
| MBB Public Markets I LLC | 0 | $0 | 0.00% | −2,937−100.0% | Sold out |
| ICONIQ Capital, LLC | 0 | $0 | 0.00% | −2,792−100.0% | Sold out |
| Stevens Capital Management LP | 0 | $0 | 0.00% | −2,769−100.0% | Sold out |
| Jaffetilchin Investment Partners, LLC | 0 | $0 | 0.00% | −2,722−100.0% | Sold out |
| XTX Topco Ltd | 0 | $0 | 0.00% | −2,702−100.0% | Sold out |
| Retireful, LLC | 0 | $0 | 0.00% | −2,602−100.0% | Sold out |
| Advisory Alpha, LLC | 0 | $0 | 0.00% | −2,550−100.0% | Sold out |
| Seed Wealth Management, Inc. | 0 | $0 | 0.00% | −2,530−100.0% | Sold out |
| Iron Financial, LLC | 0 | $0 | 0.00% | −2,517−100.0% | Sold out |
| Maven Securities LTD | 0 | $0 | 0.00% | −2,406−100.0% | Sold out |
| Brookwood Investment Group LLC | 0 | $0 | 0.00% | −2,358−100.0% | Sold out |
| Richard P Slaughter Associates Inc | 0 | $0 | 0.00% | −2,229−100.0% | Sold out |
| Cookson Peirce & Co Inc | 0 | $0 | 0.00% | −2,162−100.0% | Sold out |
| Balboa Wealth Partners | 0 | $0 | 0.00% | −2,106−100.0% | Sold out |
| Johnson Investment Counsel Inc | 0 | $0 | 0.00% | −2,033−100.0% | Sold out |
| Wesbanco Bank Inc | 0 | $0 | 0.00% | −2,029−100.0% | Sold out |
| Oliver Luxxe Assets LLC | 0 | $0 | 0.00% | −2,000−100.0% | Sold out |
| Harbour Trust & Investment Management Co | 0 | $0 | 0.00% | −2,000−100.0% | Sold out |
| Moneta Group Investment Advisors LLC | 0 | $0 | 0.00% | −1,963−100.0% | Sold out |
| TPG Advisors LLC | 0 | $0 | 0.00% | −1,954−100.0% | Sold out |
| Modera Wealth Management, LLC | 0 | $0 | 0.00% | −1,951−100.0% | Sold out |
| Pegasus Asset Management, Inc. | 0 | $0 | 0.00% | −1,950−100.0% | Sold out |
| Harvest Fund Management Co., Ltd | 0 | $0 | 0.00% | −1,800−100.0% | Sold out |
| Park Square Financial Group, LLC | 0 | $0 | 0.00% | −1,386−100.0% | Sold out |
| Headlands Technologies LLC | 0 | $0 | 0.00% | −1,122−100.0% | Sold out |
| Mount Yale Investment Advisors, LLC | 0 | $0 | 0.00% | −791−100.0% | Sold out |
| Caitong International Asset Management Co., Ltd | 0 | $0 | 0.00% | −650−100.0% | Sold out |
| Thurston, Springer, Miller, Herd & Titak, Inc. | 0 | $0 | 0.00% | −400−100.0% | Sold out |
| Transce3nd, LLC | 0 | $0 | 0.00% | −362−100.0% | Sold out |
| Loring Wolcott & Coolidge Fiduciary Advisors LLP | 0 | $0 | 0.00% | −355−100.0% | Sold out |
| MeadowBrook Investment Advisors LLC | 0 | $0 | 0.00% | −320−100.0% | Sold out |
| ORG Wealth Partners, LLC | 0 | $0 | 0.00% | −268−100.0% | Sold out |
| Beacon Capital Management, LLC | 0 | $0 | 0.00% | −260−100.0% | Sold out |
| Lazard Asset Management LLC | 0 | $0 | 0.00% | −210−100.0% | Sold out |
| Provenance Wealth Advisors, LLC | 0 | $0 | 0.00% | −189−100.0% | Sold out |
| Twin Peaks Wealth Advisors, LLC | 0 | $0 | 0.00% | −177−100.0% | Sold out |
| PMV Capital Advisers, LLC | 0 | $0 | 0.00% | −140−100.0% | Sold out |
| Bellwether Advisors, LLC | 0 | $0 | 0.00% | −128−100.0% | Sold out |
| BOK Financial Private Wealth, Inc. | 0 | $0 | 0.00% | −109−100.0% | Sold out |
| S&T Bank | 0 | $0 | 0.00% | −75−100.0% | Sold out |
| Marshall & Sterling Wealth Advisors Inc. | 0 | $0 | 0.00% | −67−100.0% | Sold out |