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 |
|---|---|---|---|---|---|
| Sierra Ocean, LLC | 0 | $0 | 0.00% | −38−100.0% | Sold out |
| WealthTrak Capital Management LLC | 0 | $0 | 0.00% | −30−100.0% | Sold out |
| POM Investment Strategies, LLC | 0 | $0 | 0.00% | −19−100.0% | Sold out |
| Stephens Consulting, LLC | 0 | $0 | 0.00% | −8−100.0% | Sold out |
| LGT Financial Advisors LLC | 0 | $0 | 0.00% | −3−100.0% | Sold out |
| Norges Bank | – | – | – | – | Not filed |
| CIBC World Markets Corp | – | – | – | – | Not filed |
| Avantax Advisory Services, Inc. | – | – | – | – | Not filed |
| Congress Wealth Management LLC | – | – | – | – | Not filed |
| TFG Advisers LLC | – | – | – | – | Not filed |
| Tyler-Stone Wealth Management | – | – | – | – | Not filed |
| EP Wealth Advisors, LLC | – | – | – | – | Not filed |
| Safe Harbor Fiduciary, LLC | – | – | – | – | Not filed |
| Savoie Capital LLC | – | – | – | – | Not filed |
| Atria Wealth Solutions, Inc. | – | – | – | – | Not filed |
| Atlas Capital Advisors LLC | – | – | – | – | Not filed |
| Wambolt & Associates, LLC | – | – | – | – | Not filed |
| First Horizon Advisors, Inc. | – | – | – | – | Not filed |
| Oliver Lagore Vanvalin Investment Group | – | – | – | – | Not filed |
| Parkworth Wealth Management, Inc. | – | – | – | – | Not filed |