WTM
White Mountains Insurance Group, Ltd. · Financial Services · Insurance - Diversified
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
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 99 | -4 | 1.16M | $2.41B | +3 | −8 |
| Q1 2026 | 107 | 0 | 1.13M | $2.49B | +3 | −4 |
| Q4 2025 | 108 | +2 | 1.27M | $2.64B | +3 | n/a |
| 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 | n/a |
| Q4 2024 | 10 | 0 | 193.12K | $375.52M | n/a | n/a |
| Q3 2024 | 9 | -1 | 149.43K | $253.48M | n/a | −1 |
| Q2 2024 | 10 | n/a | 158.36K | $287.38M | n/a | n/a |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | The Vanguard Group ✦ (passive) | 249.17K | n/a | $447.44M | 0.0% | n/c | 1 | SEC ↗ ×5 |
| 2 | BlackRock ✦ (passive) | 113.16K | n/a | $203.20M | 0.0% | n/c | 1 | SEC ↗ ×17 |
| 3 | State Street Global Advisors ✦ (passive) | 57.24K | +4.2% | $102.79M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 4 | Geode Capital Management ✦ (passive) | 42.53K | +0.8% | $76.38M | 0.0% | ▲ Add | 5 | SEC ↗ ×2 |
| 5 | Norges Bank ✦ (passive) | 30.49K | -1.5% | $54.76M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 6 | Wellington Management ✦ | 24.65K | -3.1% | $44.27M | 0.0% | ▼ Trim | 5 | SEC ↗ ×4 |
| 7 | AQR Capital Management ✦ | 8.08K | -4.8% | $14.44M | 0.0% | ▼ Trim | 5 | SEC ↗ ×4 |
| 8 | D. E. Shaw & Co. ✦ | 2.44K | +3.3% | $4.37M | 0.0% | ▲ Add | 5 | SEC ↗ ×2 |
| 9 | T. Rowe Price ✦ | 1.75K | +4.7% | $3.15M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 10 | Millennium Management ✦ | 1.39K | +45.6% | $2.50M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 11 | Citadel Advisors ✦ | 1.17K | -0.4% | $2.10M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 12 | Gotham Asset Management ✦ | 960 | New | $1.72M | 0.0% | New | 1 | SEC ↗ |
| 13 | Fidelity (FMR) ✦ | 561 | n/a | $1.01M | 0.0% | n/c | 1 | SEC ↗ ×2 |
“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.
What else this security's tracked holders most often hold: shared-ownership counts, not fundamental relationships.