Security record · archived quarter
WTM
White Mountains Insurance Group, Ltd. · Financial Services · Insurance - Diversified
13Tracked holders
-1Δ holders
533.60KShares held
$958.13MReported value
+1New positions
−2Exits
Momentum inputs (comparable managers):
holder breadth -7.1% ·
share flow +0.3% ·
net new positions -7.7%
— formula
Concentrated accumulation — rising shares among 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 | 100 | -5 | 1.16M | $2.41B | +2 | −6 |
| Q1 2026 | 107 | 0 | 1.13M | $2.49B | +3 | −4 |
| Q4 2025 | 108 | +2 | 1.27M | $2.64B | +3 | — |
| Q3 2025 | 16 | +1 | 649.64K | $1.09B | +1 | −1 |
| Q2 2025 | 13 | -1 | 533.60K | $958.13M | +1 | −2 |
| Q1 2025 | 11 | +1 | 169.09K | $325.53M | +1 | — |
| Q4 2024 | 10 | 0 | 193.12K | $375.52M | — | — |
| Q3 2024 | 9 | -1 | 149.43K | $253.48M | — | −1 |
| Q2 2024 | 10 | — | 158.36K | $287.38M | — | — |
Who holds it · Q2 2025
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | The Vanguard Group ✦ (passive) | 249.17K | — | $447.44M | 0.0% | n/c | 1 | SEC ↗ |
| 2 | The Vanguard Group ✦ (passive) | 249.17K | — | $447.44M | 0.0% | n/c | 1 | SEC ↗ |
| 3 | The Vanguard Group ✦ (passive) | 249.17K | — | $447.44M | 0.0% | n/c | 1 | SEC ↗ |
| 4 | The Vanguard Group ✦ (passive) | 249.17K | — | $447.44M | 0.0% | n/c | 1 | SEC ↗ |
| 5 | The Vanguard Group ✦ (passive) | 249.17K | — | $447.44M | 0.0% | n/c | 1 | SEC ↗ |
| 6 | BlackRock ✦ (passive) | 113.16K | — | $203.20M | 0.0% | n/c | 1 | SEC ↗ |
| 7 | BlackRock ✦ (passive) | 113.16K | — | $203.20M | 0.0% | n/c | 1 | SEC ↗ |
| 8 | BlackRock ✦ (passive) | 113.16K | — | $203.20M | 0.0% | n/c | 1 | SEC ↗ |
| 9 | BlackRock ✦ (passive) | 113.16K | — | $203.20M | 0.0% | n/c | 1 | SEC ↗ |
| 10 | BlackRock ✦ (passive) | 113.16K | — | $203.20M | 0.0% | n/c | 1 | SEC ↗ |
| 11 | BlackRock ✦ (passive) | 113.16K | — | $203.20M | 0.0% | n/c | 1 | SEC ↗ |
| 12 | BlackRock ✦ (passive) | 113.16K | — | $203.20M | 0.0% | n/c | 1 | SEC ↗ |
| 13 | BlackRock ✦ (passive) | 113.16K | — | $203.20M | 0.0% | n/c | 1 | SEC ↗ |
| 14 | BlackRock ✦ (passive) | 113.16K | — | $203.20M | 0.0% | n/c | 1 | SEC ↗ |
| 15 | BlackRock ✦ (passive) | 113.16K | — | $203.20M | 0.0% | n/c | 1 | SEC ↗ |
| 16 | BlackRock ✦ (passive) | 113.16K | — | $203.20M | 0.0% | n/c | 1 | SEC ↗ |
| 17 | BlackRock ✦ (passive) | 113.16K | — | $203.20M | 0.0% | n/c | 1 | SEC ↗ |
| 18 | BlackRock ✦ (passive) | 113.16K | — | $203.20M | 0.0% | n/c | 1 | SEC ↗ |
| 19 | BlackRock ✦ (passive) | 113.16K | — | $203.20M | 0.0% | n/c | 1 | SEC ↗ |
| 20 | BlackRock ✦ (passive) | 113.16K | — | $203.20M | 0.0% | n/c | 1 | SEC ↗ |
| 21 | BlackRock ✦ (passive) | 113.16K | — | $203.20M | 0.0% | n/c | 1 | SEC ↗ |
| 22 | BlackRock ✦ (passive) | 113.16K | — | $203.20M | 0.0% | n/c | 1 | SEC ↗ |
| 23 | State Street Global Advisors ✦ (passive) | 57.24K | +4.2% | $102.79M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 24 | Geode Capital Management ✦ (passive) | 42.53K | +0.8% | $76.38M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 25 | Geode Capital Management ✦ (passive) | 42.53K | +0.8% | $76.38M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 26 | Norges Bank ✦ (passive) | 30.49K | -1.5% | $54.76M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 27 | Wellington Management ✦ | 24.65K | -3.1% | $44.27M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 28 | Wellington Management ✦ | 24.65K | -3.1% | $44.27M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 29 | Wellington Management ✦ | 24.65K | -3.1% | $44.27M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 30 | Wellington Management ✦ | 24.65K | -3.1% | $44.27M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 31 | AQR Capital Management ✦ | 8.08K | -4.8% | $14.44M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 32 | AQR Capital Management ✦ | 8.08K | -4.8% | $14.44M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 33 | AQR Capital Management ✦ | 8.08K | -4.8% | $14.44M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 34 | AQR Capital Management ✦ | 8.08K | -4.8% | $14.44M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 35 | D. E. Shaw & Co. ✦ | 2.44K | +3.3% | $4.37M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 36 | D. E. Shaw & Co. ✦ | 2.44K | +3.3% | $4.37M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 37 | T. Rowe Price ✦ | 1.75K | +4.7% | $3.15M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 38 | Millennium Management ✦ | 1.39K | +45.6% | $2.50M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 39 | Citadel Advisors ✦ | 1.17K | -0.4% | $2.10M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 40 | Gotham Asset Management ✦ | 960 | New | $1.72M | 0.0% | New | 1 | SEC ↗ |
| 41 | Fidelity (FMR) ✦ | 561 | — | $1.01M | 0.0% | n/c | 1 | SEC ↗ |
| 42 | Fidelity (FMR) ✦ | 561 | — | $1.01M | 0.0% | 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
| Gotham Asset Management | $1.72M | 0.0% |
Exited
| Renaissance Technologies | $1.16M | was 0.0% |
| Two Sigma Investments | $577,743 | was 0.0% |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 363 holders, 2.21M shares, $4.62B 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.
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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