WTM
White Mountains Insurance Group, Ltd. · Financial Services · Insurance - Diversified
Momentum inputs (comparable managers):
holder breadth +6.7% ·
share flow -1.0% ·
net new positions 0.0%
· formula
Ownership fragmentation: more holders, smaller aggregate stake
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q3 2025
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q3 2026 | 1 | 0 | 692 | $1.22M | n/a | n/a |
| Q2 2026 | 101 | -4 | 1.16M | $2.41B | +3 | −6 |
| 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) | 247.00K | -0.9% | $412.87M | 0.0% | ▼ Trim | 2 | SEC ↗ ×5 |
| 2 | Morgan Stanley ✦ | 138.86K | n/a | $232.11M | 0.0% | n/c | 1 | SEC ↗ ×12 |
| 3 | BlackRock ✦ (passive) | 112.58K | -0.5% | $188.18M | 0.0% | ▼ Trim | 2 | SEC ↗ ×16 |
| 4 | State Street Global Advisors ✦ (passive) | 54.44K | -4.9% | $91.00M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 5 | Geode Capital Management ✦ (passive) | 42.09K | -1.0% | $70.37M | 0.0% | ▼ Trim | 6 | SEC ↗ ×2 |
| 6 | Wellington Management ✦ | 19.21K | -22.1% | $32.11M | 0.0% | ▼ Trim | 6 | SEC ↗ ×4 |
| 7 | JPMorgan Chase ✦ | 8.64K | n/a | $14.45M | 0.0% | n/c | 1 | SEC ↗ ×12 |
| 8 | Gotham Asset Management ✦ | 6.90K | +618.6% | $11.53M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 9 | Goldman Sachs Group ✦ | 5.91K | n/a | $9.88M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 10 | AQR Capital Management ✦ | 5.91K | -26.9% | $9.84M | 0.0% | ▼ Trim | 6 | SEC ↗ ×4 |
| 11 | D. E. Shaw & Co. ✦ | 2.51K | +3.1% | $4.20M | 0.0% | ▲ Add | 6 | SEC ↗ ×2 |
| 12 | T. Rowe Price ✦ | 1.88K | +7.5% | $3.15M | 0.0% | ▲ Add | 6 | SEC ↗ |
| 13 | Renaissance Technologies ✦ | 1.85K | New | $3.09M | 0.0% | New | 1 | SEC ↗ |
| 14 | Millennium Management ✦ | 934 | -32.9% | $1.56M | 0.0% | ▼ Trim | 6 | SEC ↗ |
| 15 | Fidelity (FMR) ✦ | 625 | +11.4% | $1.04M | 0.0% | ▲ Add | 2 | SEC ↗ ×3 |
| 16 | Citadel Advisors ✦ | 281 | -76.0% | $469,697 | 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
| Renaissance Technologies | $3.09M | 0.0% |
Exited
| Norges Bank | $54.76M | 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.