Security record · archived quarter
IRM
Iron Mountain Incorporated · Real Estate · REIT - Specialty
17Tracked holders
-2Δ holders
121.35MShares held
$12.46BReported value
+0New positions
−2Exits
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
Ownership over time
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 159 | 0 | 181.12M | $22.88B | +6 | −5 |
| Q1 2026 | 161 | +4 | 173.50M | $17.71B | +10 | −7 |
| Q4 2025 | 156 | +1 | 203.32M | $16.87B | +2 | — |
| Q3 2025 | 19 | 0 | 127.27M | $12.98B | — | −1 |
| Q2 2025 | 17 | -2 | 121.35M | $12.46B | — | −2 |
| Q1 2025 | 16 | 0 | 38.25M | $3.31B | +2 | −2 |
| Q4 2024 | 16 | +4 | 36.36M | $3.83B | +4 | — |
| Q3 2024 | 11 | +1 | 19.71M | $2.34B | +2 | −1 |
| Q2 2024 | 10 | — | 19.98M | $1.79B | — | — |
Who holds it · Q2 2025
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | The Vanguard Group ✦ (passive) | 47.06M | — | $4.83B | 0.1% | n/c | 1 | SEC ↗ |
| 2 | The Vanguard Group ✦ (passive) | 47.06M | — | $4.83B | 0.1% | n/c | 1 | SEC ↗ |
| 3 | The Vanguard Group ✦ (passive) | 47.06M | — | $4.83B | 0.1% | n/c | 1 | SEC ↗ |
| 4 | The Vanguard Group ✦ (passive) | 47.06M | — | $4.83B | 0.1% | n/c | 1 | SEC ↗ |
| 5 | The Vanguard Group ✦ (passive) | 47.06M | — | $4.83B | 0.1% | n/c | 1 | SEC ↗ |
| 6 | The Vanguard Group ✦ (passive) | 47.06M | — | $4.83B | 0.1% | n/c | 1 | SEC ↗ |
| 7 | BlackRock ✦ (passive) | 31.28M | — | $3.21B | 0.1% | n/c | 1 | SEC ↗ |
| 8 | BlackRock ✦ (passive) | 31.28M | — | $3.21B | 0.1% | n/c | 1 | SEC ↗ |
| 9 | BlackRock ✦ (passive) | 31.28M | — | $3.21B | 0.1% | n/c | 1 | SEC ↗ |
| 10 | BlackRock ✦ (passive) | 31.28M | — | $3.21B | 0.1% | n/c | 1 | SEC ↗ |
| 11 | BlackRock ✦ (passive) | 31.28M | — | $3.21B | 0.1% | n/c | 1 | SEC ↗ |
| 12 | BlackRock ✦ (passive) | 31.28M | — | $3.21B | 0.1% | n/c | 1 | SEC ↗ |
| 13 | BlackRock ✦ (passive) | 31.28M | — | $3.21B | 0.1% | n/c | 1 | SEC ↗ |
| 14 | BlackRock ✦ (passive) | 31.28M | — | $3.21B | 0.1% | n/c | 1 | SEC ↗ |
| 15 | BlackRock ✦ (passive) | 31.28M | — | $3.21B | 0.1% | n/c | 1 | SEC ↗ |
| 16 | BlackRock ✦ (passive) | 31.28M | — | $3.21B | 0.1% | n/c | 1 | SEC ↗ |
| 17 | BlackRock ✦ (passive) | 31.28M | — | $3.21B | 0.1% | n/c | 1 | SEC ↗ |
| 18 | BlackRock ✦ (passive) | 31.28M | — | $3.21B | 0.1% | n/c | 1 | SEC ↗ |
| 19 | BlackRock ✦ (passive) | 31.28M | — | $3.21B | 0.1% | n/c | 1 | SEC ↗ |
| 20 | BlackRock ✦ (passive) | 31.28M | — | $3.21B | 0.1% | n/c | 1 | SEC ↗ |
| 21 | BlackRock ✦ (passive) | 31.28M | — | $3.21B | 0.1% | n/c | 1 | SEC ↗ |
| 22 | BlackRock ✦ (passive) | 31.28M | — | $3.21B | 0.1% | n/c | 1 | SEC ↗ |
| 23 | BlackRock ✦ (passive) | 31.28M | — | $3.21B | 0.1% | n/c | 1 | SEC ↗ |
| 24 | BlackRock ✦ (passive) | 31.28M | — | $3.21B | 0.1% | n/c | 1 | SEC ↗ |
| 25 | BlackRock ✦ (passive) | 31.28M | — | $3.21B | 0.1% | n/c | 1 | SEC ↗ |
| 26 | BlackRock ✦ (passive) | 31.28M | — | $3.21B | 0.1% | n/c | 1 | SEC ↗ |
| 27 | BlackRock ✦ (passive) | 31.28M | — | $3.21B | 0.1% | n/c | 1 | SEC ↗ |
| 28 | BlackRock ✦ (passive) | 31.28M | — | $3.21B | 0.1% | n/c | 1 | SEC ↗ |
| 29 | State Street Global Advisors ✦ (passive) | 16.81M | +0.6% | $1.74B | 0.1% | ▲ Add | 3 | SEC ↗ |
| 30 | Geode Capital Management ✦ (passive) | 8.09M | -2.4% | $826.19M | 0.1% | ▼ Trim | 5 | SEC ↗ |
| 31 | Geode Capital Management ✦ (passive) | 8.09M | -2.4% | $826.19M | 0.1% | ▼ Trim | 5 | SEC ↗ |
| 32 | Fidelity (FMR) ✦ | 6.70M | — | $686.95M | 0.0% | n/c | 1 | SEC ↗ |
| 33 | Fidelity (FMR) ✦ | 6.70M | — | $686.95M | 0.0% | n/c | 1 | SEC ↗ |
| 34 | Fidelity (FMR) ✦ | 6.70M | — | $686.95M | 0.0% | n/c | 1 | SEC ↗ |
| 35 | Fidelity (FMR) ✦ | 6.70M | — | $686.95M | 0.0% | n/c | 1 | SEC ↗ |
| 36 | Fidelity (FMR) ✦ | 6.70M | — | $686.95M | 0.0% | n/c | 1 | SEC ↗ |
| 37 | Norges Bank ✦ (passive) | 4.09M | +10.8% | $419.46M | 0.1% | ▲ Add | 5 | SEC ↗ |
| 38 | Capital World Investors ✦ | 2.12M | 0.0% | $217.16M | 0.0% | Held | 5 | SEC ↗ |
| 39 | Wellington Management ✦ | 1.49M | +40.0% | $153.23M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 40 | Wellington Management ✦ | 1.49M | +40.0% | $153.23M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 41 | Wellington Management ✦ | 1.49M | +40.0% | $153.23M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 42 | Wellington Management ✦ | 1.49M | +40.0% | $153.23M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 43 | Point72 Asset Management ✦ | 1.01M | -51.1% | $104.04M | 0.3% | ▼ Trim | 4 | SEC ↗ |
| 44 | T. Rowe Price ✦ | 627.04K | -23.9% | $64.32M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 45 | T. Rowe Price ✦ | 627.04K | -23.9% | $64.32M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 46 | D. E. Shaw & Co. ✦ | 583.98K | -28.6% | $59.90M | 0.1% | ▼ Trim | 3 | SEC ↗ |
| 47 | Millennium Management ✦ | 575.97K | -17.2% | $59.08M | 0.1% | ▼ Trim | 5 | SEC ↗ |
| 48 | Adage Capital Partners ✦ | 560.25K | +76.2% | $57.47M | 0.1% | ▲ Add | 5 | SEC ↗ |
| 49 | Citadel Advisors ✦ | 139.79K | -88.8% | $14.34M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 50 | Citadel Advisors ✦ | 139.79K | -88.8% | $14.34M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 51 | AQR Capital Management ✦ | 106.01K | +62.7% | $10.77M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 52 | AQR Capital Management ✦ | 106.01K | +62.7% | $10.77M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 53 | AQR Capital Management ✦ | 106.01K | +62.7% | $10.77M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 54 | AQR Capital Management ✦ | 106.01K | +62.7% | $10.77M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 55 | AQR Capital Management ✦ | 106.01K | +62.7% | $10.77M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 56 | AQR Capital Management ✦ | 106.01K | +62.7% | $10.77M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 57 | AQR Capital Management ✦ | 106.01K | +62.7% | $10.77M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 58 | Gotham Asset Management ✦ | 94.83K | +44.4% | $9.73M | 0.1% | ▲ Add | 5 | SEC ↗ |
| 59 | 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.
Frequently co-owned
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)
Aug 07
Meaney William L
Officer, Director · 18.78K sh · $2.27M
Aug 07
Meaney William L
Officer, Director · 16.79K sh · $2.05M
Aug 07
Meaney William L
Officer, Director · 2.91K sh · $357,080
Aug 07
Kidd Mark
Officer · 6.00K sh · $736,200
Aug 06
McIntosh Greg W
Officer · 5.00K sh · $635,650
Aug 06
McIntosh Greg W
Officer · 6.84K sh · $869,442
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology
Provenance: Ownership from parsed 13F common-stock positions (tracked universe, comparable sets for changes); insider rows from Forms 3/4/5; stakes from Schedules 13D/13G; every filing links to its original on SEC EDGAR.
Reporting period: Q2 2025 ·
Methodology ·
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