Vanguard Portfolio Management 13D and 13G filings for Iron Mountain Incorporated:
- Schedule 13D must be filed within ten days after a person or an organization acquires beneficial ownership of more than 5% of a voting class of a company's equity securities.
- Shares have been adjusted for stock splits.
| Reported DateTime | Transaction Date | Type | Company Symbol | Filed By Symbol | Shares Owned % Owned | Shares Vs. Prev Report | View |
| 2026-04-29 2:10 pm Purchase | 2026-03-31 | 13G | IRON MOUNTAIN INC IRM | Vanguard Portfolio Management | 25,051,135 8.420% | 25,051,135 (New Position) | Filing |