Iron Mountain Incorporated (IRM) ownership: Top institutional holder: VANGUARD GROUP INC ($3.87B). Insider activity: Net Seller (0 buys, 20 sells). 10 recent congressional STOCK Act disclosures. SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| VANGUARD GROUP INC | 46627483.00 | $3.87B | 2025-12-31 |
| BlackRock, Inc. | 33021354.00 | $3.37B | 2026-03-31 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 25015557.00 | $2.56B | 2026-03-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 18758889.00 | $1.92B | 2026-03-31 |
| STATE STREET CORP | 17551633.00 | $1.81B | 2026-03-31 |
| COHEN & STEERS, INC. | 16169341.00 | $1.65B | 2026-03-31 |
| GEODE CAPITAL MANAGEMENT, LLC | 8486127.00 | $863.70M | 2026-03-31 |
| FMR LLC | 7484398.00 | $764.46M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-08-07 | |
| Sell | null | 2026-08-07 | |
| Sell | null | 2026-08-07 | |
| Sell | null | 2026-08-07 | |
| Sell | null | 2026-08-07 | |
| Sell | null | 2026-08-07 | |
| Sell | null | 2026-08-06 | |
| Sell | null | 2026-08-06 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.