Iron Mountain Incorporated (IRM)
Real Estate
REIT - Specialty
122.30 $
-1.9%
vs. previous close
Closing price · As of: 31. Jul 2026
Who owns Iron Mountain Incorporated (IRM)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 99.0% of the shares are freely tradable; institutional investors hold 87.9%.
Ownership Structure
Institutional ownership
Share of the stock held by institutional investors (funds, banks, insurers) according to regulatory filings.
87.9%
Insiders
Share of the stock held by the executives, founders and major shareholders of the company itself.
0.9%
Float
Share of stock freely tradable on the market — not locked up in the hands of founders, insiders, or major shareholders.
99.0%
Short % of float
Shares sold short as a percentage of the freely tradable float — high values signal many bets on falling prices.
3.7%
Shares Outstanding
Total number of shares issued. Price times share count gives market cap.
298Mio.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard Group Inc | 15.67 | 46,627,483 | -1.3 | 12/31/2025 |
| BlackRock Inc | 11.10 | 33,021,354 | +0.3 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 8.41 | 25,015,557 | +0.0 | 03/31/2026 |
| Vanguard Capital Management, LLC | 6.31 | 18,758,889 | +0.0 | 03/31/2026 |
| State Street Corp | 5.90 | 17,551,633 | +3.9 | 03/31/2026 |
| Cohen & Steers Inc | 5.43 | 16,169,341 | -14.5 | 03/31/2026 |
| Geode Capital Management, LLC | 2.85 | 8,486,127 | +2.3 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard Real Estate Index Investor | 3.69 | 10,966,144 | -0.3 | 04/30/2026 |
| Vanguard Total Stock Mkt Idx Inv | 3.01 | 8,963,127 | +0.2 | 04/30/2026 |
| Vanguard 500 Index Investor | 2.58 | 7,671,671 | +1.8 | 04/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Data as of: July 31, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.