IRM
Iron Mountain Incorporated · Real Estate · REIT - Specialty
Momentum inputs (comparable managers):
holder breadth +10.0% ·
share flow -1.4% ·
net new positions +9.1%
· formula
Ownership fragmentation: more holders, smaller aggregate stake
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q3 2024
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q3 2026 | 3 | 0 | 97.02K | $10.17M | n/a | n/a |
| 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 | Geode Capital Management ✦ (passive) | 8.26M | +1.6% | $978.48M | 0.1% | ▲ Add | 2 | SEC ↗ ×2 |
| 2 | Capital World Investors ✦ | 4.12M | 0.0% | $489.10M | 0.1% | ▼ Trim | 2 | SEC ↗ |
| 3 | Norges Bank ✦ (passive) | 3.28M | +1.3% | $389.76M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 4 | Wellington Management ✦ | 2.39M | -29.2% | $284.43M | 0.1% | ▼ Trim | 2 | SEC ↗ ×7 |
| 5 | T. Rowe Price ✦ | 820.13K | +29.6% | $97.46M | 0.0% | ▲ Add | 2 | SEC ↗ ×2 |
| 6 | Point72 Asset Management ✦ | 222.41K | New | $26.43M | 0.1% | New | 1 | SEC ↗ |
| 7 | Adage Capital Partners ✦ | 176.45K | -37.2% | $20.97M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 8 | AQR Capital Management ✦ | 163.70K | +225.8% | $19.13M | 0.0% | ▲ Add | 2 | SEC ↗ ×3 |
| 9 | Millennium Management ✦ | 129.24K | +65.6% | $15.36M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 10 | Gotham Asset Management ✦ | 81.40K | +14.7% | $9.67M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 11 | Citadel Advisors ✦ | 65.87K | New | $7.83M | 0.0% | New | 1 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value: the conviction measure. ✦ = curated manager.
New buyers
| Point72 Asset Management | $26.43M | 0.1% |
| Citadel Advisors | $7.83M | 0.0% |
Exited
| D. E. Shaw & Co. | $699,753 | 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