IRM
Iron Mountain Incorporated · Real Estate · REIT - Specialty
Momentum inputs (comparable managers):
holder breadth -10.5% ·
share flow -1.6% ·
net new positions -11.8%
· formula
Broad distribution: falling shares and fewer holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q2 2025
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| 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 | The Vanguard Group ✦ (passive) | 47.06M | n/a | $4.83B | 0.1% | n/c | 1 | SEC ↗ ×6 |
| 2 | BlackRock ✦ (passive) | 31.28M | n/a | $3.21B | 0.1% | n/c | 1 | SEC ↗ ×22 |
| 3 | State Street Global Advisors ✦ (passive) | 16.81M | +0.6% | $1.74B | 0.1% | ▲ Add | 3 | SEC ↗ |
| 4 | Geode Capital Management ✦ (passive) | 8.09M | -2.4% | $826.19M | 0.1% | ▼ Trim | 5 | SEC ↗ ×2 |
| 5 | Fidelity (FMR) ✦ | 6.70M | n/a | $686.95M | 0.0% | n/c | 1 | SEC ↗ ×5 |
| 6 | Norges Bank ✦ (passive) | 4.09M | +10.8% | $419.46M | 0.1% | ▲ Add | 5 | SEC ↗ |
| 7 | Capital World Investors ✦ | 2.12M | 0.0% | $217.16M | 0.0% | Held | 5 | SEC ↗ |
| 8 | Wellington Management ✦ | 1.49M | +40.0% | $153.23M | 0.0% | ▲ Add | 5 | SEC ↗ ×4 |
| 9 | Point72 Asset Management ✦ | 1.01M | -51.1% | $104.04M | 0.3% | ▼ Trim | 4 | SEC ↗ |
| 10 | T. Rowe Price ✦ | 627.04K | -23.9% | $64.32M | 0.0% | ▼ Trim | 5 | SEC ↗ ×2 |
| 11 | D. E. Shaw & Co. ✦ | 583.98K | -28.6% | $59.90M | 0.1% | ▼ Trim | 3 | SEC ↗ |
| 12 | Millennium Management ✦ | 575.97K | -17.2% | $59.08M | 0.1% | ▼ Trim | 5 | SEC ↗ |
| 13 | Adage Capital Partners ✦ | 560.25K | +76.2% | $57.47M | 0.1% | ▲ Add | 5 | SEC ↗ |
| 14 | Citadel Advisors ✦ | 139.79K | -88.8% | $14.34M | 0.0% | ▼ Trim | 4 | SEC ↗ ×2 |
| 15 | AQR Capital Management ✦ | 106.01K | +62.7% | $10.77M | 0.0% | ▲ Add | 5 | SEC ↗ ×7 |
| 16 | Gotham Asset Management ✦ | 94.83K | +44.4% | $9.73M | 0.1% | ▲ Add | 5 | SEC ↗ |
| 17 | Fisher Asset Management ✦ | 5.07K | -17.7% | $519,607 | 0.0% | ▼ Trim | 3 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value: the conviction measure. ✦ = curated manager.
New buyers
| No new tracked buyers this quarter. |
Exited
| Two Sigma Investments | $15.10M | was 0.0% |
| Renaissance Technologies | $7.38M | 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