Iron Mountain Incorporated
Ownership
Ownership Structure
Who owns Iron Mountain Incorporated (IRM)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 99.1% of the shares are freely tradable; institutional investors hold 87.9%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 11.09 | 33,021,354 | +0.3 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 8.40 | 25,015,557 | +0.0 | 03/31/2026 |
| Vanguard Capital Management, LLC | 6.30 | 18,758,889 | +0.0 | 03/31/2026 |
| State Street Corp | 5.90 | 17,551,633 | +3.9 | 03/31/2026 |
| Cohen & Steers Inc | 4.04 | 12,019,735 | -25.7 | 06/30/2026 |
| Geode Capital Management, LLC | 2.85 | 8,486,127 | +2.3 | 03/31/2026 |
| FMR Inc | 2.51 | 7,484,398 | -6.3 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard Real Estate Index Investor | 3.80 | 11,317,007 | -0.1 | 07/31/2026 |
| Vanguard MStar Total Stk Mkt Idx Invest | 3.02 | 9,001,545 | +0.3 | 07/31/2026 |
| Vanguard 500 Index Investor | 2.62 | 7,812,430 | +1.1 | 07/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Kidd Mark | EVP, GM Data Centers & ALM | 95,507 | 10,916,450 $ | Sep 1, 2026 | direct |
| McIntosh Greg W | EVP, Chief Commercial Officer | 75,634 | 8,644,966 $ | Sep 1, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 1, 2026 | McIntosh Greg W | EVP, Chief Commercial Officer | Sell | 5,000 | 115.60 | 578,000 |
| Sep 1, 2026 | Kidd Mark | EVP, GM Data Centers & ALM | Sell | 6,000 | 115.60 | 693,600 |
| Sep 1, 2026 | Meaney William L | President and CEO | Sell | 89 | 116.00 | 10,324 |
| Sep 1, 2026 | Meaney William L | President and CEO | Sell | 6,101 | 115.00 | 701,615 |
| Sep 1, 2026 | Meaney William L | President and CEO | Sell | 20,952 | 114.14 | 2,391,461 |
| Sep 1, 2026 | Meaney William L | President and CEO | Sell | 11,332 | 113.45 | 1,285,615 |
| Sep 1, 2026 | Meaney William L | President and CEO | Other | 38,474 | 37.00 | 1,423,538 |
| Aug 7, 2026 | Kidd Mark | EVP, GM Data Centers & ALM | Sell | 6,000 | 122.70 | 736,200 |
| Aug 7, 2026 | Meaney William L | President and CEO | Sell | 2,909 | 122.75 | 357,080 |
| Aug 7, 2026 | Meaney William L | President and CEO | Sell | 16,785 | 122.11 | 2,049,616 |
| Aug 7, 2026 | Meaney William L | President and CEO | Sell | 18,780 | 121.10 | 2,274,258 |
| Aug 7, 2026 | Meaney William L | President and CEO | Other | 38,474 | 37.00 | 1,423,538 |
| Aug 6, 2026 | McIntosh Greg W | EVP, Chief Commercial Officer | Sell | 6,839 | 127.13 | 869,442 |
| Aug 6, 2026 | McIntosh Greg W | EVP, Chief Commercial Officer | Other | 6,839 | 37.00 | 253,043 |
| Aug 6, 2026 | McIntosh Greg W | EVP, Chief Commercial Officer | Sell | 5,000 | 127.13 | 635,650 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 18, 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.