White Mountains Insurance Group, Ltd. · NYSE:WTM
White Mountains Insurance Group, Ltd. shareholders
As of Jun 30, 2026, 345 institutions reported holding White Mountains Insurance Group, Ltd. Largest: Vanguard, Dimensional and Neuberger Berman Group LLC. New holders, exits, insiders and big stakes, each with its filing.
| Holder | Shares | % of White Mountains Insurance Group, Ltd. | Change | Filed |
|---|---|---|---|---|
| Vanguard | 239K | −5,182 | Aug 13, 2026 | |
| Dimensional | 159K | +2,336 | Aug 11, 2026 | |
| Neuberger Berman Group LLC | 119K | −5,574 | Aug 13, 2026 | |
| BlackRock | 118K | +4,543 | Aug 7, 2026 | |
| River Road Asset Management, LLC | 116K | −4,639 | Jul 17, 2026 | |
| Fuller & Thaler Asset Management, Inc. | 102K | −2,669 | Aug 12, 2026 | |
| Cooke & Bieler LP | 85,120 | −19,737 | Jul 30, 2026 | |
| Wallace Capital Management Inc. | 80,067 | +1,272 | Aug 14, 2026 | |
| Fiduciary Management Inc | 66,550 | −18,516 | Aug 13, 2026 | |
| Gendell Jeffrey L | 59,243 | +21,429 | Aug 14, 2026 |