WTM
White Mountains Insurance Group, Ltd. · Financial Services · Insurance - Diversified
Momentum inputs (comparable managers): holder breadth 0.0% · share flow -5.5% · net new positions 0.0% — formula
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q4 2024
| 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 | — | — |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | State Street Global Advisors ✦ (passive) | 54.88K | — | $106.75M | 0.0% | n/c | 1 | SEC ↗ |
| 2 | Wellington Management ✦ | 49.93K | -17.7% | $97.11M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 3 | Wellington Management ✦ | 49.93K | -17.7% | $97.11M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 4 | Wellington Management ✦ | 49.93K | -17.7% | $97.11M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 5 | Wellington Management ✦ | 49.93K | -17.7% | $97.11M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 6 | Geode Capital Management ✦ (passive) | 39.73K | -0.3% | $77.31M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 7 | Geode Capital Management ✦ (passive) | 39.73K | -0.3% | $77.31M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 8 | Norges Bank ✦ (passive) | 30.67K | 0.0% | $59.66M | 0.0% | Held | 3 | SEC ↗ |
| 9 | AQR Capital Management ✦ | 10.14K | -7.0% | $19.59M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 10 | AQR Capital Management ✦ | 10.14K | -7.0% | $19.59M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 11 | AQR Capital Management ✦ | 10.14K | -7.0% | $19.59M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 12 | D. E. Shaw & Co. ✦ | 2.72K | -16.1% | $5.29M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 13 | D. E. Shaw & Co. ✦ | 2.72K | -16.1% | $5.29M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 14 | Millennium Management ✦ | 2.40K | +509.4% | $4.67M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 15 | T. Rowe Price ✦ | 1.57K | +8.4% | $3.05M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 16 | Renaissance Technologies ✦ | 600 | -68.4% | $1.17M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 17 | Two Sigma Investments ✦ | 470 | +32.0% | $914,178 | 0.0% | ▲ Add | 3 | 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
| No tracked exits this quarter. |
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.