Security record · archived quarter
IRM
Iron Mountain Incorporated · Real Estate · REIT - Specialty
156Tracked holders
+1Δ holders
203.32MShares held
$16.87BReported value
+2New positions
−0Exits
Momentum inputs (comparable managers):
holder breadth +0.6% ·
share flow -0.2% ·
net new positions +1.3%
— formula
Ownership fragmentation — more holders, smaller aggregate stake
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q4 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 · Q4 2025
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | The Vanguard Group ✦ (passive) | 46.63M | -1.3% | $3.87B | 0.1% | ▼ Trim | 3 | SEC ↗ |
| 2 | The Vanguard Group ✦ (passive) | 46.63M | -1.3% | $3.87B | 0.1% | ▼ Trim | 3 | SEC ↗ |
| 3 | The Vanguard Group ✦ (passive) | 46.63M | -1.3% | $3.87B | 0.1% | ▼ Trim | 3 | SEC ↗ |
| 4 | The Vanguard Group ✦ (passive) | 46.63M | -1.3% | $3.87B | 0.1% | ▼ Trim | 3 | SEC ↗ |
| 5 | The Vanguard Group ✦ (passive) | 46.63M | -1.3% | $3.87B | 0.1% | ▼ Trim | 3 | SEC ↗ |
| 6 | The Vanguard Group ✦ (passive) | 46.63M | -1.3% | $3.87B | 0.1% | ▼ Trim | 3 | SEC ↗ |
| 7 | BlackRock ✦ (passive) | 32.92M | +3.8% | $2.73B | 0.0% | ▲ Add | 3 | SEC ↗ |
| 8 | BlackRock ✦ (passive) | 32.92M | +3.8% | $2.73B | 0.0% | ▲ Add | 3 | SEC ↗ |
| 9 | BlackRock ✦ (passive) | 32.92M | +3.8% | $2.73B | 0.0% | ▲ Add | 3 | SEC ↗ |
| 10 | BlackRock ✦ (passive) | 32.92M | +3.8% | $2.73B | 0.0% | ▲ Add | 3 | SEC ↗ |
| 11 | BlackRock ✦ (passive) | 32.92M | +3.8% | $2.73B | 0.0% | ▲ Add | 3 | SEC ↗ |
| 12 | BlackRock ✦ (passive) | 32.92M | +3.8% | $2.73B | 0.0% | ▲ Add | 3 | SEC ↗ |
| 13 | BlackRock ✦ (passive) | 32.92M | +3.8% | $2.73B | 0.0% | ▲ Add | 3 | SEC ↗ |
| 14 | BlackRock ✦ (passive) | 32.92M | +3.8% | $2.73B | 0.0% | ▲ Add | 3 | SEC ↗ |
| 15 | BlackRock ✦ (passive) | 32.92M | +3.8% | $2.73B | 0.0% | ▲ Add | 3 | SEC ↗ |
| 16 | BlackRock ✦ (passive) | 32.92M | +3.8% | $2.73B | 0.0% | ▲ Add | 3 | SEC ↗ |
| 17 | BlackRock ✦ (passive) | 32.92M | +3.8% | $2.73B | 0.0% | ▲ Add | 3 | SEC ↗ |
| 18 | BlackRock ✦ (passive) | 32.92M | +3.8% | $2.73B | 0.0% | ▲ Add | 3 | SEC ↗ |
| 19 | BlackRock ✦ (passive) | 32.92M | +3.8% | $2.73B | 0.0% | ▲ Add | 3 | SEC ↗ |
| 20 | BlackRock ✦ (passive) | 32.92M | +3.8% | $2.73B | 0.0% | ▲ Add | 3 | SEC ↗ |
| 21 | BlackRock ✦ (passive) | 32.92M | +3.8% | $2.73B | 0.0% | ▲ Add | 3 | SEC ↗ |
| 22 | BlackRock ✦ (passive) | 32.92M | +3.8% | $2.73B | 0.0% | ▲ Add | 3 | SEC ↗ |
| 23 | BlackRock ✦ (passive) | 32.92M | +3.8% | $2.73B | 0.0% | ▲ Add | 3 | SEC ↗ |
| 24 | BlackRock ✦ (passive) | 32.92M | +3.8% | $2.73B | 0.0% | ▲ Add | 3 | SEC ↗ |
| 25 | BlackRock ✦ (passive) | 32.92M | +3.8% | $2.73B | 0.0% | ▲ Add | 3 | SEC ↗ |
| 26 | BlackRock ✦ (passive) | 32.92M | +3.8% | $2.73B | 0.0% | ▲ Add | 3 | SEC ↗ |
| 27 | BlackRock ✦ (passive) | 32.92M | +3.8% | $2.73B | 0.0% | ▲ Add | 3 | SEC ↗ |
| 28 | BlackRock ✦ (passive) | 32.92M | +3.8% | $2.73B | 0.0% | ▲ Add | 3 | SEC ↗ |
| 29 | State Street Global Advisors ✦ (passive) | 16.89M | -1.4% | $1.42B | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 30 | Geode Capital Management ✦ (passive) | 8.29M | +1.2% | $685.37M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 31 | Geode Capital Management ✦ (passive) | 8.29M | +1.2% | $685.37M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 32 | Fidelity (FMR) ✦ | 7.98M | +1.6% | $662.30M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 33 | Fidelity (FMR) ✦ | 7.98M | +1.6% | $662.30M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 34 | Fidelity (FMR) ✦ | 7.98M | +1.6% | $662.30M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 35 | Fidelity (FMR) ✦ | 7.98M | +1.6% | $662.30M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 36 | Fidelity (FMR) ✦ | 7.98M | +1.6% | $662.30M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 37 | Norges Bank ✦ (passive) | 4.45M | New | $368.89M | 0.0% | New | 1 | SEC ↗ |
| 38 | Dimensional Fund Advisors Lp | 4.43M | — | $367.42M | 0.1% | n/c | 1 | SEC ↗ |
| 39 | Dimensional Fund Advisors Lp | 4.43M | — | $367.42M | 0.1% | n/c | 1 | SEC ↗ |
| 40 | Dimensional Fund Advisors Lp | 4.43M | — | $367.42M | 0.1% | n/c | 1 | SEC ↗ |
| 41 | Dimensional Fund Advisors Lp | 4.43M | — | $367.42M | 0.1% | n/c | 1 | SEC ↗ |
| 42 | Dimensional Fund Advisors Lp | 4.43M | — | $367.42M | 0.1% | n/c | 1 | SEC ↗ |
| 43 | Invesco Ltd. | 4.42M | — | $366.42M | 0.0% | n/c | 1 | SEC ↗ |
| 44 | Invesco Ltd. | 4.42M | — | $366.42M | 0.0% | n/c | 1 | SEC ↗ |
| 45 | Invesco Ltd. | 4.42M | — | $366.42M | 0.0% | n/c | 1 | SEC ↗ |
| 46 | Invesco Ltd. | 4.42M | — | $366.42M | 0.0% | n/c | 1 | SEC ↗ |
| 47 | Invesco Ltd. | 4.42M | — | $366.42M | 0.0% | n/c | 1 | SEC ↗ |
| 48 | Invesco Ltd. | 4.42M | — | $366.42M | 0.0% | n/c | 1 | SEC ↗ |
| 49 | Invesco Ltd. | 4.42M | — | $366.42M | 0.0% | n/c | 1 | SEC ↗ |
| 50 | Invesco Ltd. | 4.42M | — | $366.42M | 0.0% | n/c | 1 | SEC ↗ |
| 51 | Invesco Ltd. | 4.42M | — | $366.42M | 0.0% | n/c | 1 | SEC ↗ |
| 52 | Invesco Ltd. | 4.42M | — | $366.42M | 0.0% | n/c | 1 | SEC ↗ |
| 53 | Invesco Ltd. | 4.42M | — | $366.42M | 0.0% | n/c | 1 | SEC ↗ |
| 54 | Invesco Ltd. | 4.42M | — | $366.42M | 0.0% | n/c | 1 | SEC ↗ |
| 55 | Invesco Ltd. | 4.42M | — | $366.42M | 0.0% | n/c | 1 | SEC ↗ |
| 56 | Invesco Ltd. | 4.42M | — | $366.42M | 0.0% | n/c | 1 | SEC ↗ |
| 57 | Invesco Ltd. | 4.42M | — | $366.42M | 0.0% | n/c | 1 | SEC ↗ |
| 58 | Invesco Ltd. | 4.42M | — | $366.42M | 0.0% | n/c | 1 | SEC ↗ |
| 59 | Principal Financial Group Inc | 4.21M | — | $349.02M | 0.2% | n/c | 1 | SEC ↗ |
| 60 | Principal Financial Group Inc | 4.21M | — | $349.02M | 0.2% | n/c | 1 | SEC ↗ |
| 61 | Principal Financial Group Inc | 4.21M | — | $349.02M | 0.2% | n/c | 1 | SEC ↗ |
| 62 | Northern Trust Corp | 4.15M | — | $344.46M | 0.0% | n/c | 1 | SEC ↗ |
| 63 | Northern Trust Corp | 4.15M | — | $344.46M | 0.0% | n/c | 1 | SEC ↗ |
| 64 | Northern Trust Corp | 4.15M | — | $344.46M | 0.0% | n/c | 1 | SEC ↗ |
| 65 | Northern Trust Corp | 4.15M | — | $344.46M | 0.0% | n/c | 1 | SEC ↗ |
| 66 | Northern Trust Corp | 4.15M | — | $344.46M | 0.0% | n/c | 1 | SEC ↗ |
| 67 | Northern Trust Corp | 4.15M | — | $344.46M | 0.0% | n/c | 1 | SEC ↗ |
| 68 | Northern Trust Corp | 4.15M | — | $344.46M | 0.0% | n/c | 1 | SEC ↗ |
| 69 | Northern Trust Corp | 4.15M | — | $344.46M | 0.0% | n/c | 1 | SEC ↗ |
| 70 | Northern Trust Corp | 4.15M | — | $344.46M | 0.0% | n/c | 1 | SEC ↗ |
| 71 | Northern Trust Corp | 4.15M | — | $344.46M | 0.0% | n/c | 1 | SEC ↗ |
| 72 | Charles Schwab Investment… | 3.88M | — | $321.87M | 0.1% | n/c | 1 | SEC ↗ |
| 73 | Daiwa Securities Group Inc. | 3.65M | — | $303.11M | 1.0% | n/c | 1 | SEC ↗ |
| 74 | Daiwa Securities Group Inc. | 3.65M | — | $303.11M | 1.0% | n/c | 1 | SEC ↗ |
| 75 | Morgan Stanley ✦ | 3.60M | -0.3% | $298.53M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 76 | Morgan Stanley ✦ | 3.60M | -0.3% | $298.53M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 77 | Morgan Stanley ✦ | 3.60M | -0.3% | $298.53M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 78 | Morgan Stanley ✦ | 3.60M | -0.3% | $298.53M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 79 | Morgan Stanley ✦ | 3.60M | -0.3% | $298.53M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 80 | Morgan Stanley ✦ | 3.60M | -0.3% | $298.53M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 81 | Morgan Stanley ✦ | 3.60M | -0.3% | $298.53M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 82 | Morgan Stanley ✦ | 3.60M | -0.3% | $298.53M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 83 | Morgan Stanley ✦ | 3.60M | -0.3% | $298.53M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 84 | Morgan Stanley ✦ | 3.60M | -0.3% | $298.53M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 85 | Morgan Stanley ✦ | 3.60M | -0.3% | $298.53M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 86 | Morgan Stanley ✦ | 3.60M | -0.3% | $298.53M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 87 | Morgan Stanley ✦ | 3.60M | -0.3% | $298.53M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 88 | Morgan Stanley ✦ | 3.60M | -0.3% | $298.53M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 89 | Morgan Stanley ✦ | 3.60M | -0.3% | $298.53M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 90 | Legal & General Group Plc | 3.36M | — | $278.42M | 0.1% | n/c | 1 | SEC ↗ |
| 91 | Legal & General Group Plc | 3.36M | — | $278.42M | 0.1% | n/c | 1 | SEC ↗ |
| 92 | Legal & General Group Plc | 3.36M | — | $278.42M | 0.1% | n/c | 1 | SEC ↗ |
| 93 | Deutsche Bank Ag\ | 2.54M | — | $210.86M | 0.1% | n/c | 1 | SEC ↗ |
| 94 | Deutsche Bank Ag\ | 2.54M | — | $210.86M | 0.1% | n/c | 1 | SEC ↗ |
| 95 | Deutsche Bank Ag\ | 2.54M | — | $210.86M | 0.1% | n/c | 1 | SEC ↗ |
| 96 | Deutsche Bank Ag\ | 2.54M | — | $210.86M | 0.1% | n/c | 1 | SEC ↗ |
| 97 | Deutsche Bank Ag\ | 2.54M | — | $210.86M | 0.1% | n/c | 1 | SEC ↗ |
| 98 | Deutsche Bank Ag\ | 2.54M | — | $210.86M | 0.1% | n/c | 1 | SEC ↗ |
| 99 | Deutsche Bank Ag\ | 2.54M | — | $210.86M | 0.1% | n/c | 1 | SEC ↗ |
| 100 | Deutsche Bank Ag\ | 2.54M | — | $210.86M | 0.1% | n/c | 1 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Norges Bank | $368.89M | 0.0% |
Exited
| No tracked exits this quarter. |
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: Q4 2025 ·
Methodology ·
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