Iron Mountain
Secures business records, data-center capacity, and retired IT assets across their lifecycles.
$116.63
After-hours close−0.73 (−0.62%)
At close$117.36(−4.34%)
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Breakdown13F · Form 4
Institutions 106.16%Insiders 0.72%
A 13F quarter can total more than the shares outstanding — sub-advisers file the same block twice, and a filer's own share count can be a quarter stale. No split is drawn from it.
Shares outstanding 297.52M · Float 294.69M · 99.1% free float
Institutions13F, as of Jun 30, 2026
1,207 holders · 315.86M shares · 158 new positions · 603 increased · 388 reduced · 77 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| BlackRock, Inc. | 33.57M | 11.28% | +549.6K | Aug 7, 2026 |
| Vanguard Portfolio Management LLC | 25.57M | 8.59% | +553.4K | Aug 13, 2026 |
| Vanguard Capital Management LLC | 18.95M | 6.37% | +194.8K | Aug 13, 2026 |
| State Street Corp | 17.63M | 5.93% | +82.4K | Aug 7, 2026 |
| Cohen & Steers, Inc. | 12.02M | 4.04% | −4.15M | Aug 14, 2026 |
| Geode Capital Management, LLC | 8.65M | 2.91% | +163.1K | Aug 12, 2026 |
| FMR LLC | 7.87M | 2.65% | +388.0K | Aug 13, 2026 |
| Dimensional Fund Advisors LP | 4.63M | 1.55% | +73.4K | Aug 11, 2026 |
Beneficial owners13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| Vanguard Portfolio Management | 8.42% | 25.05M | 13G | Apr 29, 2026 ↗ |
| Vanguard Capital Management | 7.35% | 21.87M | 13G | Apr 30, 2026 ↗ |
| State Street Corporation | 5.70% | 16.57M | Oct 17, 2024 ↗ |
InsidersForm 4
| Insider | Role | Shares | % outstanding | Filed |
|---|---|---|---|---|
| Kent P. Dauten | director | 1.21M | 0.41% | May 11, 2026 |
| Barry Hytinen | officer: EVP and CFO | 326.6K | 0.11% | Mar 3, 2026 |
| Clark H. Bailey | director | 242.5K | 0.08% | Jul 3, 2025 |
| Mark Kidd | officer: EVP, GM Data Centers & ALM | 101.5K | 0.03% | Aug 10, 2026 |
| Greg W. McIntosh | officer: EVP, Chief Commercial Officer | 87.5K | 0.03% | Aug 10, 2026 |
| Pamela M. Arway | director | 40.2K | 0.01% | May 13, 2026 |
| Monte E. Ford | director | 31.8K | 0.01% | May 11, 2026 |
| Robin Matlock | director | 30.5K | 0.01% | May 11, 2026 |
| Walter C. Rakowich | director | 25.0K | 0.01% | May 21, 2026 |
| Mithu Bhargava | officer: EVP, GM Digital Business Unit | 16.1K | 0.01% | Mar 23, 2026 |
38 people have not refiled in the last 18 months (8.38M shares), so they are not in the figure above
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Aug 7, 2026 | William L. Meaneydirector, officer: President and CEO | Sale · 3 lots | 38,474 | $121.67 | 0 |
| Aug 7, 2026 | Mark Kiddofficer: EVP, GM Data Centers & ALM | Sale | 6,000 | $122.70 | 101,507 |
| Aug 6, 2026 | Greg W. McIntoshofficer: EVP, Chief Commercial Officer | Sale | 6,839 | $127.13 | 80,634 |
| Jul 1, 2026 | Mark Kiddofficer: EVP, GM Data Centers & ALM | Sale | 6,000 | $125.62 | 107,507 |
| Jul 1, 2026 | William L. Meaneydirector, officer: President and CEO | Sale · 5 lots | 38,474 | $122.83 | 0 |
| Jun 1, 2026 | Mark Kiddofficer: EVP, GM Data Centers & ALM | Sale | 6,000 | $126.70 | 113,507 |
| Jun 1, 2026 | William L. Meaneydirector, officer: President and CEO | Sale · 5 lots | 38,474 | $127.55 | 0 |
| May 21, 2026 | Daniel Borgesofficer: SVP & Chief Accounting Officer | Sale | 7,189 | $125.50 | 0 |
| May 20, 2026 | Walter C. Rakowichdirector | Sale | 757 | $124.45 | 1,135 |
| May 12, 2026 | Pamela M. Arwaydirector | Sale | 1,892 | $128.97 | 40,196 |
CongressHouse and Senate disclosures
| Member | Type | Amount | Owner | Traded | Disclosed |
|---|---|---|---|---|---|
| Sen. Markwayne Mullin · OK | Sale | $1,001 – $15,000 | Joint | Feb 4, 2026 | Mar 2, 2026 ↗ |