Iron Mountain
IRM · NYSE
Who owns IRM
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 41.7% of IRM’s shares.
- Vanguard Portfolio Management, LLC8.6%
- BlackRock Institutional Trust Company, N.A.7.6%
- Vanguard Capital Management, LLC6.4%
- State Street Investment Management (US)5.9%
- Next 6 largest institutions13.2%
- All other shareholders58.3%
| Holder | Shares | % of shares |
|---|---|---|
| Vanguard Portfolio Management, LLC | 25.57M | 8.59% |
| BlackRock Institutional Trust Company, N.A. | 22.47M | 7.55% |
| Vanguard Capital Management, LLC | 18.95M | 6.37% |
| State Street Investment Management (US) | 17.63M | 5.93% |
| Cohen & Steers Capital Management, Inc. | 12.02M | 4.04% |
| Geode Capital Management, L.L.C. | 8.65M | 2.91% |
| Fidelity Management & Research Company LLC | 5.39M | 1.81% |
| Dimensional Fund Advisors, L.P. | 4.63M | 1.55% |
| Principal Global Investors (Equity) | 4.37M | 1.47% |
| Charles Schwab Investment Management, Inc. | 4.26M | 1.43% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| Vanguard Real Estate Index Fund | 11.32M | 3.80% |
| Vanguard Total Stock Market Index Fund | 9.00M | 3.03% |
| Vanguard 500 Index Fund | 7.81M | 2.63% |
| Vanguard Mid-Cap Index Fund | 6.12M | 2.06% |
| iShares Core S&P 500 ETF | 3.97M | 1.33% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders sold $35.50M (34 trades) of IRM on the open market, with no buys.
| Insider | Type | Shares | Value |
|---|---|---|---|
| Samuels Theodore R. II | Award | 310 | $36.19K |
| Simons Doyle | Award | 350 | $39.87K |
| Samuels Theodore R. II | Award | 105 | $11.96K |
| McIntosh Greg W | Sale | 5.00K | $553.60K |
| Meaney William L | Option exercise | 38.47K | — |
| Meaney William L | Sale | 14.31K | $1.59M |
| Meaney William L | Sale | 10.81K | $1.19M |
| Meaney William L | Sale | 13.36K | $1.46M |
| Meaney William L | Option exercise | 38.47K | $1.42M |
| McIntosh Greg W | Sale | 5.00K | $578.00K |
Congressional trades
Disclosed by members of Congress over the last 12 months
| Member | Type | Amount | Traded |
|---|---|---|---|
| Markwayne MullinSenator | Sale (Full) | $1K–$15K | Feb 4, 2026 |
| Markwayne MullinSenator | Sale (Full) | $15K–$50K | Dec 18, 2025 |
Short interest
Settled Sep 30, 2026
- Shares short
- 7.00M
- Days to cover
- 4.24
- % of shares outstanding
- 2.35%
- Average daily volume
- 1.65M
- Change since last report
- −11.8%
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