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 | 11.28 | 33,570,910 | +1.7 | 06/30/2026 |
| Vanguard Portfolio Management, LLC | 8.59 | 25,568,944 | +2.2 | 06/30/2026 |
| Vanguard Capital Management, LLC | 6.37 | 18,953,705 | +1.0 | 06/30/2026 |
| State Street Corp | 5.92 | 17,634,044 | +0.5 | 06/30/2026 |
| Cohen & Steers Inc | 4.04 | 12,019,735 | -25.7 | 06/30/2026 |
| Geode Capital Management, LLC | 2.91 | 8,649,249 | +1.9 | 06/30/2026 |
| FMR Inc | 2.64 | 7,872,365 | +5.2 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard Real Estate Index Investor | 3.78 | 11,266,639 | +0.7 | 09/30/2026 |
| Vanguard MStar Total Stk Mkt Idx Invest | 3.01 | 8,961,018 | -0.2 | 09/30/2026 |
| Vanguard 500 Index Investor | 2.63 | 7,819,699 | -1.1 | 09/30/2026 |
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 | 11,145,667 $ | Sep 1, 2026 | direct |
| McIntosh Greg W | EVP, Chief Commercial Officer | 65,634 | 7,659,488 $ | Nov 2, 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 |
|---|---|---|---|---|---|---|
| Nov 2, 2026 | McIntosh Greg W | EVP, Chief Commercial Officer | Sell | 5,000 | 116.96 | 584,800 |
| Oct 1, 2026 | McIntosh Greg W | EVP, Chief Commercial Officer | Sell | 5,000 | 110.72 | 553,600 |
| Oct 1, 2026 | Meaney William L | President and CEO | Sell | 14,308 | 111.18 | 1,590,763 |
| Oct 1, 2026 | Meaney William L | President and CEO | Sell | 10,808 | 110.56 | 1,194,932 |
| Oct 1, 2026 | Meaney William L | President and CEO | Sell | 13,358 | 109.57 | 1,463,636 |
| Oct 1, 2026 | Meaney William L | President and CEO | Other | 38,474 | 37.00 | 1,423,538 |
| 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: November 3, 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.