Who Owns WHITE MTNS INS GROUP LTD (WTM)? -- Institutional Holders (2026-06-30)

398 institutions reported holding $4.62B of WHITE MTNS INS GROUP LTD (WTM) in SEC 13F filings for 2026-06-30. Largest institutional holders: VANGUARD GROUP INC ($495.0M), DIMENSIONAL FUND ADVISORS LP ($329.6M), NEUBERGER BERMAN GROUP LLC ($247.0M), BlackRock, Inc. ($244.4M), River Road Asset Management, LLC ($240.3M). Source: SEC Form 13F.

Rank	Institution	Value	Shares	Change
1	VANGUARD GROUP INC	$495.0M	238,721	Trimmed
2	DIMENSIONAL FUND ADVISORS LP	$329.6M	158,954	Added
3	NEUBERGER BERMAN GROUP LLC	$247.0M	119,141	Trimmed
4	BlackRock, Inc.	$244.4M	117,871	Added
5	River Road Asset Management, LLC	$240.3M	115,880	Trimmed
6	FULLER & THALER ASSET MANAGEMENT, INC.	$211.3M	101,892	Trimmed
7	COOKE & BIELER LP	$176.5M	85,120	Trimmed
8	Wallace Capital Management Inc.	$166.0M	80,067	Added
9	FIDUCIARY MANAGEMENT INC /WI/	$138.0M	66,550	Trimmed
10	GENDELL JEFFREY L	$122.8M	59,243	Added
11	Boston Partners	$115.3M	55,569	Trimmed
12	LONDON CO OF VIRGINIA	$112.1M	54,025	Trimmed
13	STATE STREET CORP	$104.2M	50,257	Added
14	GEODE CAPITAL MANAGEMENT, LLC	$102.5M	49,412	Added
15	MORGAN STANLEY	$97.2M	46,866	Trimmed
16	REINHART PARTNERS, LLC.	$92.3M	44,480	Added
17	T. Rowe Price Investment Management, Inc.	$71.0M	34,237	Trimmed
18	LORD, ABBETT & CO. LLC	$68.1M	32,829	Trimmed
19	AMERICAN CENTURY COMPANIES INC	$64.5M	31,108	Added
20	NORGES BANK	$58.0M	27,956	Trimmed
21	Cannell & Spears LLC	$57.2M	27,577	Trimmed
22	BANK OF AMERICA CORP /DE/	$51.9M	25,028	Trimmed
23	Sixth Street Partners Management Company, L.P.	$48.7M	23,505	New
24	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	$48.7M	23,505	Trimmed
25	Mraz, Amerine & Associates, Inc.	$46.1M	22,218	Added

来源：SEC 13F 申报文件 · 截至 2026-06-30