IRM
Iron Mountain Incorporated · Real Estate · REIT - Specialty
Momentum inputs (comparable managers): holder breadth 0.0% · share flow +5.2% · net new positions 0.0% · formula
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q1 2025
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q3 2026 | 3 | 0 | 97.02K | $10.17M | n/a | −1 |
| Q2 2026 | 157 | 0 | 179.85M | $22.72B | +6 | −7 |
| Q1 2026 | 161 | +4 | 173.50M | $17.71B | +10 | −7 |
| Q4 2025 | 156 | +1 | 203.32M | $16.87B | +2 | n/a |
| Q3 2025 | 19 | 0 | 127.27M | $12.98B | n/a | −1 |
| Q2 2025 | 17 | -2 | 121.35M | $12.46B | n/a | −2 |
| Q1 2025 | 16 | 0 | 38.25M | $3.31B | +2 | −2 |
| Q4 2024 | 16 | +4 | 36.36M | $3.83B | +4 | n/a |
| Q3 2024 | 11 | +1 | 19.71M | $2.34B | +2 | −1 |
| Q2 2024 | 10 | n/a | 19.98M | $1.79B | n/a | n/a |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | State Street Global Advisors ✦ (passive) | 16.71M | +0.5% | $1.45B | 0.1% | ▲ Add | 2 | SEC ↗ |
| 2 | Geode Capital Management ✦ (passive) | 8.28M | +4.7% | $715.89M | 0.1% | ▲ Add | 4 | SEC ↗ ×2 |
| 3 | Norges Bank ✦ (passive) | 3.69M | +11.4% | $317.61M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 4 | Capital World Investors ✦ | 2.12M | -44.5% | $182.16M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 5 | Point72 Asset Management ✦ | 2.08M | +72.8% | $178.56M | 0.5% | ▲ Add | 3 | SEC ↗ |
| 6 | Citadel Advisors ✦ | 1.25M | +107.1% | $107.70M | 0.1% | ▲ Add | 3 | SEC ↗ ×2 |
| 7 | Wellington Management ✦ | 1.07M | -31.0% | $91.84M | 0.0% | ▼ Trim | 4 | SEC ↗ ×4 |
| 8 | T. Rowe Price ✦ | 824.10K | -6.1% | $70.91M | 0.0% | ▼ Trim | 4 | SEC ↗ ×2 |
| 9 | D. E. Shaw & Co. ✦ | 817.45K | +7539.7% | $70.33M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 10 | Millennium Management ✦ | 695.89K | +2282.1% | $59.87M | 0.1% | ▲ Add | 4 | SEC ↗ |
| 11 | Adage Capital Partners ✦ | 318.05K | +178.6% | $27.37M | 0.1% | ▲ Add | 4 | SEC ↗ |
| 12 | Two Sigma Investments ✦ | 175.53K | New | $15.10M | 0.0% | New | 1 | SEC ↗ |
| 13 | Renaissance Technologies ✦ | 85.76K | New | $7.38M | 0.0% | New | 1 | SEC ↗ |
| 14 | Gotham Asset Management ✦ | 65.68K | -24.1% | $5.65M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 15 | AQR Capital Management ✦ | 65.17K | -68.0% | $5.53M | 0.0% | ▼ Trim | 4 | SEC ↗ ×5 |
| 16 | Fisher Asset Management ✦ | 6.16K | +10.2% | $529,786 | 0.0% | ▲ Add | 2 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value: the conviction measure. ✦ = curated manager.
New buyers
| Two Sigma Investments | $15.10M | 0.0% |
| Renaissance Technologies | $7.38M | 0.0% |
Exited
| Marshall Wace | $1.93M | was 0.0% |
| Bridgewater Associates | $217,998 | was 0.0% |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 1,078 holders, 250.54M shares, $23.29B reported. This is a different, older period than the tracked-universe figures above and the two are never mixed.
What else this security's tracked holders most often hold: shared-ownership counts, not fundamental relationships.
Open-market purchases (P)
No open-market insider purchases in our coverage window.
Open-market sales (S)
Officer, Director · 89 sh · $10,324
Officer, Director · 11.33K sh · $1.29M
Officer, Director · 20.95K sh · $2.39M
Officer, Director · 6.10K sh · $701,615
Officer · 5.00K sh · $578,000
Officer · 6.00K sh · $693,600
Officer, Director · 18.78K sh · $2.27M
Officer, Director · 16.79K sh · $2.05M
Officer, Director · 2.91K sh · $357,080
Officer · 6.00K sh · $736,200
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology