Filing Flows › Iron Mountain (IRM) › Who owns the stock
Who owns Iron Mountain (IRM) stock
1,089 funds reported Iron Mountain (IRM) shares in their latest 13F filings, worth $34.6B in all. The largest holder is BlackRock ($4.2B). Last quarter 534 funds added to their stakes and 400 cut them. Members of Congress and other officials disclosed 3 trades (0 buys, 3 sales).
Largest holders (13F)
| Fund | Shares | Value | Change | Quarter |
|---|---|---|---|---|
| BlackRock | 33,570,910 | $4.2B | increase | 2026-06-30 |
| Vanguard Group | 46,627,483 | $3.9B | decrease | 2025-12-31 |
| Vanguard Portfolio Management LLC | 25,568,944 | $3.2B | increase | 2026-06-30 |
| Vanguard Capital Management LLC | 18,953,705 | $2.4B | increase | 2026-06-30 |
| State Street | 17,634,044 | $2.2B | increase | 2026-06-30 |
| Cohen & Steers | 12,019,735 | $1.5B | decrease | 2026-06-30 |
| Geode Capital Management, LLC | 8,649,249 | $1.1B | increase | 2026-06-30 |
| FMR LLC | 7,872,365 | $994M | increase | 2026-06-30 |
| Dimensional Fund Advisors LP | 4,625,684 | $584M | increase | 2026-06-30 |
| Morgan Stanley | 4,426,922 | $559M | decrease | 2026-06-30 |
| Principal Financial Group | 4,373,424 | $552M | decrease | 2026-06-30 |
| Charles Schwab Investment Management | 4,263,487 | $539M | increase | 2026-06-30 |
| Northern Trust | 4,222,967 | $533M | increase | 2026-06-30 |
| Invesco | 4,065,649 | $514M | increase | 2026-06-30 |
| Legal & General Group | 3,244,741 | $410M | increase | 2026-06-30 |
Trades by Congress and other officials
| Date | Who | Trade | Amount |
|---|---|---|---|
| 2026-02-04 | Markwayne Mullin | sale | $1K–$15K |
| 2025-12-18 | Markwayne Mullin | sale | $1K–$15K |
| 2025-12-18 | Markwayne Mullin | sale | $15K–$50K |
Iron Mountain's latest quarter
Iron Mountain, Q3 2026: revenue $2.0B (+14% year over year), operating margin 20.6%, net earnings $124M, operating cash flow $316M. The chart follows the revenue to costs, profit and cash.
Questions
Who owns the most IRM stock?
By the latest 13F filings: BlackRock ($4.2B); Vanguard Group ($3.9B); Vanguard Portfolio Management LLC ($3.2B); Vanguard Capital Management LLC ($2.4B); State Street ($2.2B).
Has Congress traded IRM stock?
Officials disclosed 3 trades on file: 0 buys and 3 sales. The latest: Markwayne Mullin, sale on 2026-02-04.
What is the short interest in IRM?
7,146,315 shares were sold short at the 2026-10-15 settlement, 2.09% of the float.
Updated Nov 8, 2026. Read automatically from SEC filings and public data; errors are possible. Not investment advice.