| Type | Filed | Filer | Subject | Shares Owned | Percent Owned | |
|---|---|---|---|---|---|---|
| SC 13G | 2024-02-14 | COHEN & STEERS, INC. | IRON MOUNTAIN INC | 22,909,485 | 7.8% | EDGAR |
| SC 13G/A | 2024-02-13 | VANGUARD GROUP INC | IRON MOUNTAIN INC | 46,275,110 | 15.8% | EDGAR |
| SC 13G/A | 2024-01-26 | BlackRock Inc. | IRON MOUNTAIN INC | 23,272,316 | 8.0% | EDGAR |
| SC 13G/A | 2023-12-11 | Capital World Investors | IRON MOUNTAIN INC | 4,616,827 | 1.6% | EDGAR |
| SC 13G/A | 2023-02-13 | Capital World Investors | IRON MOUNTAIN INC | 25,488,174 | 8.8% | EDGAR |
| SC 13G/A | 2023-02-09 | VANGUARD GROUP INC | IRON MOUNTAIN INC | 47,429,924 | 16.3% | EDGAR |
| SC 13G/A | 2023-01-30 | BlackRock Inc. | IRON MOUNTAIN INC | 22,618,177 | 7.8% | EDGAR |
| SC 13G/A | 2022-02-11 | Capital World Investors | IRON MOUNTAIN INC | 32,713,760 | 11.3% | EDGAR |
| SC 13G/A | 2022-02-10 | VANGUARD GROUP INC | IRON MOUNTAIN INC | 48,432,157 | 16.7% | EDGAR |
| SC 13G/A | 2022-02-01 | BlackRock Inc. | IRON MOUNTAIN INC | 22,998,096 | 7.9% | EDGAR |
| SC 13G/A | 2021-02-16 | Capital World Investors | IRON MOUNTAIN INC | 29,113,163 | 10.1% | EDGAR |
| SC 13G/A | 2021-02-10 | VANGUARD GROUP INC | IRON MOUNTAIN INC | 48,363,389 | 16.8% | EDGAR |
| SC 13G/A | 2021-01-29 | BlackRock Inc. | IRON MOUNTAIN INC | 22,577,824 | 7.8% | EDGAR |
| SC 13G/A | 2020-02-14 | Capital World Investors | IRON MOUNTAIN INC | 28,997,693 | 10.0% | EDGAR |
| SC 13G/A | 2020-02-11 | VANGUARD GROUP INC | IRON MOUNTAIN INC | 47,595,566 | 16.6% | EDGAR |
| SC 13G/A | 2020-02-05 | BlackRock Inc. | IRON MOUNTAIN INC | 21,319,069 | 7.4% | EDGAR |
| SC 13G/A | 2019-02-14 | Capital World Investors | IRON MOUNTAIN INC | 33,587,900 | 11.7% | EDGAR |
| SC 13G/A | 2019-02-13 | VANGUARD GROUP INC | IRON MOUNTAIN INC | 43,875,177 | 15.3% | EDGAR |
| SC 13G/A | 2019-02-04 | BlackRock Inc. | IRON MOUNTAIN INC | 20,124,142 | 7.0% | EDGAR |
| SC 13G/A | 2019-01-31 | VANGUARD SPECIALIZED FUNDS | IRON MOUNTAIN INC | 12,958,753 | 4.5% | EDGAR |