White Mountains Insurance Group Ltd (NYSE:WTM) has 360 institutional investors with active 13F positions as of March 2026.
| Owner Name | Date | Shares Held | Change (QoQ) | Change (%) | Value (USD) |
|---|---|---|---|---|---|
| DIMENSIONAL FUND ADVISORS LP | 31 Mar, 2026 | 156,618 | 14 | 0.01% | $344,084,166.00 |
| Neuberger Berman Group LLC | 31 Mar, 2026 | 124,715 | -4,939 | -3.81% | $273,993,893.00 |
| River Road Asset Management, LLC | 31 Mar, 2026 | 120,519 | -361 | -0.30% | $264,775,422.00 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 31 Mar, 2026 | 115,553 | 115,553 | 0.00% | $253,865,319.00 |
| BlackRock, Inc. | 31 Mar, 2026 | 113,328 | 1,039 | 0.93% | $248,976,061.00 |
| VANGUARD CAPITAL MANAGEMENT LLC | 31 Mar, 2026 | 109,157 | 109,157 | 0.00% | $239,813,563.00 |
| COOKE & BIELER LP | 31 Mar, 2026 | 104,857 | -1,722 | -1.62% | $230,366,635.00 |
| FULLER & THALER ASSET MANAGEMENT, INC. | 31 Mar, 2026 | 104,561 | -111,783 | -51.67% | $229,715,563.00 |
| FIDUCIARY MANAGEMENT INC /WI/ | 31 Mar, 2026 | 85,066 | -5,267 | -5.83% | $186,886,599.00 |
| Wallace Capital Management Inc. | 31 Mar, 2026 | 78,795 | -1,552 | -1.93% | $173,109,162.00 |
| Morgan Stanley | 31 Mar, 2026 | 59,295 | -22,856 | -27.82% | $130,273,576.00 |
| Boston Partners | 31 Mar, 2026 | 57,459 | -19,452 | -25.29% | $126,222,446.00 |
| LONDON CO OF VIRGINIA | 31 Mar, 2026 | 57,131 | -1,566 | -2.67% | $125,537,405.00 |
| Cannell & Spears LLC | 31 Mar, 2026 | 56,054 | 27,939 | 99.37% | $123,146,612.00 |
| State Street Corp | 31 Mar, 2026 | 49,158 | -1,505 | -2.97% | $107,998,160.00 |
| GEODE CAPITAL MANAGEMENT, LLC | 31 Mar, 2026 | 42,119 | 601 | 1.45% | $92,559,204.00 |
| T. Rowe Price Investment Management, Inc. | 31 Mar, 2026 | 41,513 | -9,709 | -18.95% | $91,203.00 |
| GENDELL JEFFREY L | 31 Mar, 2026 | 37,814 | 5,294 | 16.28% | $83,075,845.00 |
| REINHART PARTNERS, LLC. | 31 Mar, 2026 | 37,374 | -6,599 | -15.01% | $82,148,044.00 |
| LORD, ABBETT & CO. LLC | 31 Mar, 2026 | 33,110 | -686 | -2.03% | $72,741.00 |