Security record · archived quarter
IRM
Iron Mountain Incorporated · Real Estate · REIT - Specialty
161Tracked holders
+4Δ holders
173.50MShares held
$17.71BReported value
+10New positions
−7Exits
Momentum inputs (comparable managers):
holder breadth +2.5% ·
share flow +1.0% ·
net new positions +1.9%
— formula
Broad accumulation — rising shares across more holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q1 2026
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 · Q1 2026
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | BlackRock ✦ (passive) | 33.02M | +0.3% | $3.37B | 0.1% | ▲ Add | 4 | SEC ↗ |
| 2 | BlackRock ✦ (passive) | 33.02M | +0.3% | $3.37B | 0.1% | ▲ Add | 4 | SEC ↗ |
| 3 | BlackRock ✦ (passive) | 33.02M | +0.3% | $3.37B | 0.1% | ▲ Add | 4 | SEC ↗ |
| 4 | BlackRock ✦ (passive) | 33.02M | +0.3% | $3.37B | 0.1% | ▲ Add | 4 | SEC ↗ |
| 5 | BlackRock ✦ (passive) | 33.02M | +0.3% | $3.37B | 0.1% | ▲ Add | 4 | SEC ↗ |
| 6 | BlackRock ✦ (passive) | 33.02M | +0.3% | $3.37B | 0.1% | ▲ Add | 4 | SEC ↗ |
| 7 | BlackRock ✦ (passive) | 33.02M | +0.3% | $3.37B | 0.1% | ▲ Add | 4 | SEC ↗ |
| 8 | BlackRock ✦ (passive) | 33.02M | +0.3% | $3.37B | 0.1% | ▲ Add | 4 | SEC ↗ |
| 9 | BlackRock ✦ (passive) | 33.02M | +0.3% | $3.37B | 0.1% | ▲ Add | 4 | SEC ↗ |
| 10 | BlackRock ✦ (passive) | 33.02M | +0.3% | $3.37B | 0.1% | ▲ Add | 4 | SEC ↗ |
| 11 | BlackRock ✦ (passive) | 33.02M | +0.3% | $3.37B | 0.1% | ▲ Add | 4 | SEC ↗ |
| 12 | BlackRock ✦ (passive) | 33.02M | +0.3% | $3.37B | 0.1% | ▲ Add | 4 | SEC ↗ |
| 13 | BlackRock ✦ (passive) | 33.02M | +0.3% | $3.37B | 0.1% | ▲ Add | 4 | SEC ↗ |
| 14 | BlackRock ✦ (passive) | 33.02M | +0.3% | $3.37B | 0.1% | ▲ Add | 4 | SEC ↗ |
| 15 | BlackRock ✦ (passive) | 33.02M | +0.3% | $3.37B | 0.1% | ▲ Add | 4 | SEC ↗ |
| 16 | BlackRock ✦ (passive) | 33.02M | +0.3% | $3.37B | 0.1% | ▲ Add | 4 | SEC ↗ |
| 17 | BlackRock ✦ (passive) | 33.02M | +0.3% | $3.37B | 0.1% | ▲ Add | 4 | SEC ↗ |
| 18 | BlackRock ✦ (passive) | 33.02M | +0.3% | $3.37B | 0.1% | ▲ Add | 4 | SEC ↗ |
| 19 | BlackRock ✦ (passive) | 33.02M | +0.3% | $3.37B | 0.1% | ▲ Add | 4 | SEC ↗ |
| 20 | BlackRock ✦ (passive) | 33.02M | +0.3% | $3.37B | 0.1% | ▲ Add | 4 | SEC ↗ |
| 21 | BlackRock ✦ (passive) | 33.02M | +0.3% | $3.37B | 0.1% | ▲ Add | 4 | SEC ↗ |
| 22 | Vanguard Capital Management Llc | 18.76M | — | $1.92B | 0.0% | n/c | 1 | SEC ↗ |
| 23 | State Street Global Advisors ✦ (passive) | 17.55M | +3.9% | $1.81B | 0.1% | ▲ Add | 6 | SEC ↗ |
| 24 | Geode Capital Management ✦ (passive) | 8.49M | +2.3% | $863.70M | 0.1% | ▲ Add | 8 | SEC ↗ |
| 25 | Geode Capital Management ✦ (passive) | 8.49M | +2.3% | $863.70M | 0.1% | ▲ Add | 8 | SEC ↗ |
| 26 | Fidelity (FMR) ✦ | 7.48M | -6.3% | $764.46M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 27 | Fidelity (FMR) ✦ | 7.48M | -6.3% | $764.46M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 28 | Fidelity (FMR) ✦ | 7.48M | -6.3% | $764.46M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 29 | Fidelity (FMR) ✦ | 7.48M | -6.3% | $764.46M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 30 | Fidelity (FMR) ✦ | 7.48M | -6.3% | $764.46M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 31 | Morgan Stanley ✦ | 4.65M | +29.3% | $475.18M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 32 | Morgan Stanley ✦ | 4.65M | +29.3% | $475.18M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 33 | Morgan Stanley ✦ | 4.65M | +29.3% | $475.18M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 34 | Morgan Stanley ✦ | 4.65M | +29.3% | $475.18M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 35 | Morgan Stanley ✦ | 4.65M | +29.3% | $475.18M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 36 | Morgan Stanley ✦ | 4.65M | +29.3% | $475.18M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 37 | Morgan Stanley ✦ | 4.65M | +29.3% | $475.18M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 38 | Morgan Stanley ✦ | 4.65M | +29.3% | $475.18M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 39 | Morgan Stanley ✦ | 4.65M | +29.3% | $475.18M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 40 | Morgan Stanley ✦ | 4.65M | +29.3% | $475.18M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 41 | Morgan Stanley ✦ | 4.65M | +29.3% | $475.18M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 42 | Morgan Stanley ✦ | 4.65M | +29.3% | $475.18M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 43 | Morgan Stanley ✦ | 4.65M | +29.3% | $475.18M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 44 | Morgan Stanley ✦ | 4.65M | +29.3% | $475.18M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 45 | Morgan Stanley ✦ | 4.65M | +29.3% | $475.18M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 46 | Principal Financial Group Inc | 4.57M | +8.5% | $466.38M | 0.2% | ▲ Add | 2 | SEC ↗ |
| 47 | Principal Financial Group Inc | 4.57M | +8.5% | $466.38M | 0.2% | ▲ Add | 2 | SEC ↗ |
| 48 | Principal Financial Group Inc | 4.57M | +8.5% | $466.38M | 0.2% | ▲ Add | 2 | SEC ↗ |
| 49 | Dimensional Fund Advisors Lp | 4.55M | +2.8% | $464.93M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 50 | Dimensional Fund Advisors Lp | 4.55M | +2.8% | $464.93M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 51 | Dimensional Fund Advisors Lp | 4.55M | +2.8% | $464.93M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 52 | Dimensional Fund Advisors Lp | 4.55M | +2.8% | $464.93M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 53 | Dimensional Fund Advisors Lp | 4.55M | +2.8% | $464.93M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 54 | Northern Trust Corp | 4.15M | -0.1% | $423.93M | 0.1% | ▼ Trim | 2 | SEC ↗ |
| 55 | Northern Trust Corp | 4.15M | -0.1% | $423.93M | 0.1% | ▼ Trim | 2 | SEC ↗ |
| 56 | Northern Trust Corp | 4.15M | -0.1% | $423.93M | 0.1% | ▼ Trim | 2 | SEC ↗ |
| 57 | Northern Trust Corp | 4.15M | -0.1% | $423.93M | 0.1% | ▼ Trim | 2 | SEC ↗ |
| 58 | Northern Trust Corp | 4.15M | -0.1% | $423.93M | 0.1% | ▼ Trim | 2 | SEC ↗ |
| 59 | Northern Trust Corp | 4.15M | -0.1% | $423.93M | 0.1% | ▼ Trim | 2 | SEC ↗ |
| 60 | Northern Trust Corp | 4.15M | -0.1% | $423.93M | 0.1% | ▼ Trim | 2 | SEC ↗ |
| 61 | Northern Trust Corp | 4.15M | -0.1% | $423.93M | 0.1% | ▼ Trim | 2 | SEC ↗ |
| 62 | Northern Trust Corp | 4.15M | -0.1% | $423.93M | 0.1% | ▼ Trim | 2 | SEC ↗ |
| 63 | Northern Trust Corp | 4.15M | -0.1% | $423.93M | 0.1% | ▼ Trim | 2 | SEC ↗ |
| 64 | Northern Trust Corp | 4.15M | -0.1% | $423.93M | 0.1% | ▼ Trim | 2 | SEC ↗ |
| 65 | Charles Schwab Investment… | 4.01M | +3.4% | $409.89M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 66 | Invesco Ltd. | 3.92M | -11.2% | $400.54M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 67 | Invesco Ltd. | 3.92M | -11.2% | $400.54M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 68 | Invesco Ltd. | 3.92M | -11.2% | $400.54M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 69 | Invesco Ltd. | 3.92M | -11.2% | $400.54M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 70 | Invesco Ltd. | 3.92M | -11.2% | $400.54M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 71 | Invesco Ltd. | 3.92M | -11.2% | $400.54M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 72 | Invesco Ltd. | 3.92M | -11.2% | $400.54M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 73 | Invesco Ltd. | 3.92M | -11.2% | $400.54M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 74 | Invesco Ltd. | 3.92M | -11.2% | $400.54M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 75 | Invesco Ltd. | 3.92M | -11.2% | $400.54M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 76 | Invesco Ltd. | 3.92M | -11.2% | $400.54M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 77 | Invesco Ltd. | 3.92M | -11.2% | $400.54M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 78 | Invesco Ltd. | 3.92M | -11.2% | $400.54M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 79 | Invesco Ltd. | 3.92M | -11.2% | $400.54M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 80 | Invesco Ltd. | 3.92M | -11.2% | $400.54M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 81 | Legal & General Group Plc | 3.14M | -6.6% | $320.22M | 0.1% | ▼ Trim | 2 | SEC ↗ |
| 82 | Legal & General Group Plc | 3.14M | -6.6% | $320.22M | 0.1% | ▼ Trim | 2 | SEC ↗ |
| 83 | Legal & General Group Plc | 3.14M | -6.6% | $320.22M | 0.1% | ▼ Trim | 2 | SEC ↗ |
| 84 | Daiwa Securities Group Inc. | 3.11M | -15.0% | $317.39M | 0.9% | ▼ Trim | 2 | SEC ↗ |
| 85 | Daiwa Securities Group Inc. | 3.11M | -15.0% | $317.39M | 0.9% | ▼ Trim | 2 | SEC ↗ |
| 86 | Deutsche Bank Ag\ | 3.09M | +21.6% | $315.83M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 87 | Deutsche Bank Ag\ | 3.09M | +21.6% | $315.83M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 88 | Deutsche Bank Ag\ | 3.09M | +21.6% | $315.83M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 89 | Deutsche Bank Ag\ | 3.09M | +21.6% | $315.83M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 90 | Deutsche Bank Ag\ | 3.09M | +21.6% | $315.83M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 91 | Deutsche Bank Ag\ | 3.09M | +21.6% | $315.83M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 92 | Deutsche Bank Ag\ | 3.09M | +21.6% | $315.83M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 93 | Deutsche Bank Ag\ | 3.09M | +21.6% | $315.83M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 94 | Deutsche Bank Ag\ | 3.09M | +21.6% | $315.83M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 95 | Deutsche Bank Ag\ | 3.09M | +21.6% | $315.83M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 96 | Deutsche Bank Ag\ | 3.09M | +21.6% | $315.83M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 97 | Deutsche Bank Ag\ | 3.09M | +21.6% | $315.83M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 98 | Deutsche Bank Ag\ | 3.09M | +21.6% | $315.83M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 99 | Prudential Financial Inc | 2.42M | +4.6% | $246.78M | 0.3% | ▲ Add | 2 | SEC ↗ |
| 100 | Prudential Financial Inc | 2.42M | +4.6% | $246.78M | 0.3% | ▲ Add | 2 | 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
| Norges Bank | $368.89M | was 0.0% |
| Canada Pension Plan… | $7.31M | was 0.0% |
| Man Group plc | $4.76M | was 0.0% |
| Connor, Clark & Lunn… | $3.27M | was 0.0% |
| IMC-Chicago, LLC | $1.80M | was 0.0% |
| D. E. Shaw & Co. | $477,460 | was 0.0% |
| Capstone Investment Advisors… | $323,588 | 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: Q1 2026 ·
Methodology ·
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