White Mountains Insurance Group Ltd

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White Mountains Insurance Group Ltd
TickerWTM
CIK #0000776867
CUSIPG9618E107
SectorFinance - Fire, Marine & Casualty Insurance
Address80 South Main St, Hanover, NH 03755
Source [EDGAR]
CIK Filing 2011 - 2026
[0000776867] 10-K
[0000776867] 10-Q
[0000776867] 13F-HR
[0000776867] 13F-NT
[0000776867] 3
[0000776867] 4
[0000776867] 5
[0000776867] 8-K
[0000776867] SC 13D
[0000776867] SC 13G
Form 13D/13G Filer Form 13D/13G Subject Filed % Owned
White Mountains Insurance Group Ltd Mediaalpha Inc [2023-06-30] 49.9
Fuller & Thaler Asset Management Inc White Mountains Insurance Group Ltd [2023-02-14] 5.95
Dimensional Fund Advisors LP White Mountains Insurance Group Ltd [2023-02-10] 6.2
White Mountains Insurance Group Ltd Mediaalpha Inc [2023-02-10] 39.3
River Road Asset Management LLC White Mountains Insurance Group Ltd [2023-02-08] 5.4
Eaton Vance Management White Mountains Insurance Group Ltd [2021-02-12] 7.02
White Mountains Insurance Group Ltd Mediaalpha Inc [2021-02-12] 61.9
River Road Asset Management LLC White Mountains Insurance Group Ltd [2021-02-10] 5.2
Boston Partners White Mountains Insurance Group Ltd [2019-02-14] 5.51
Wellington Management Group LLP White Mountains Insurance Group Ltd [2019-02-12] 7.05
Vanguard Group Inc White Mountains Insurance Group Ltd [2016-02-11] 5.38
Price T Rowe Associates Inc /MD/ White Mountains Insurance Group Ltd [2014-02-12] 5.2
London Co of Virginia White Mountains Insurance Group Ltd [2013-12-10] 5.19
Gillespie George J III White Mountains Insurance Group Ltd [2013-09-17] 5.2
[2013-03-18] None
Form 3/4/5 Filer 2011 - 2026
Shank Suzanne F
White Mountains Insurance Group Ltd
Gelston Philip A
Choksi Mary C
Carlson Peter M
Campbell Reid Tarlton
Yi Steven
Tanner David Allen
Hicks Weston M
Dillon Margaret
Hildreth Michaela
Seelig Robert Lawrence
Caffrey Liam P
Harrison Giles E
Rountree George Manning
WM Hinson (Bermuda) Ltd.
MediaAlpha, Inc.
Davis Morgan W
Palmer Jess Brian
Holiday Edith E
Bazos Frank R
Smith Lowndes Andrew
Brouillette Yves
Tolman Gary Charles
Frinquelli Angelo Michael
OneBeacon Insurance Group, Ltd.
Foy David Thomas
Linker David
Barrette Raymond Joseph Rene
Symetra Financial CORP
Oberting Kernan V
Waters Allan Lewis
Gillespie John Davies
Clark Howard Longstreth Jr
Byrne John Joseph
Form 13F Holdings
Firm Period DFND Voting Shares
Vanguard Group Inc [2025-06-30] SOLE 0 245,156
Morgan Stanley [2025-06-30] DFND 106,757 165,064
Dimensional Fund Advisors LP [2025-06-30] SOLE 147,105 149,235
BlackRock, Inc. [2025-06-30] SOLE 107,093 113,147
River Road Asset Management LLC [2025-06-30] SOLE 92,978 109,892
Fuller & Thaler Asset Management Inc [2025-06-30] SOLE 99,456 100,984
Neuberger Berman Group LLC [2025-06-30] DFND 79,258 83,061
Wallace Capital Management Inc [2025-06-30] SOLE 79,036 79,036
Cooke & Bieler LP [2025-06-30] SOLE 63,646 76,781
Fiduciary Management Inc /WI/ [2025-06-30] SOLE 65,512 71,478
London Co of Virginia [2025-06-30] SOLE 67,417 68,770
State Street Corp [2025-06-30] DFND 48,406 57,241
Boston Partners [2025-06-30] DFND 50,954 53,980
Geode Capital Management LLC [2025-06-30] DFND 42,529 42,529
Reinhart Partners LLC [2025-06-30] SOLE 38,116 41,694
Bank of America Corp /DE/ [2025-06-30] DFND 1,265 39,409
Boston Partners [2025-06-30] OTR 0 35,414
Lord Abbett & Co LLC [2025-06-30] SOLE 30,839 32,227
Raymond James Financial Inc [2025-06-30] DFND 29,557 30,677
Norges Bank [2025-06-30] SOLE 30,494 30,494
Allspring Global Investments Holdings, LLC [2025-06-30] DFND 6,389 29,585
Cannell & Spears LLC [2025-06-30] SOLE 28,347 28,347
Wellington Management Group LLP [2025-06-30] DFND 0 24,651
Charles Schwab Investment Management Inc [2025-06-30] SOLE 24,183 24,183
MRAZ Amerine & Associates Inc [2025-06-30] SOLE 0 21,576
Brown Advisory Inc [2025-06-30] DFND 20,793 20,854
Southeastern Asset Management Inc/TN/ [2025-06-30] DFND 20,138 20,138
Select Equity Group LP [2025-06-30] SOLE 17,872 17,872
Robeco Institutional Asset Management B.V. [2025-06-30] DFND 9,247 17,822
Victory Capital Management Inc [2025-06-30] SOLE 17,627 17,640
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