White Mountains Insurance Group Ltd

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White Mountains Insurance Group Ltd
CIK #0000776867
Sector Form 13F Holdings Value ($M)
Mediaalpha Inc 166.1
 
 
 
 
 
 
 
 
 
 
Holdings by Sector ($M)
100080060040020002011201620212027
EDGAR Form CIK 2011 - 2026
10-K [0000776867]
10-Q [0000776867]
13F-HR [0000776867]
13F-NT [0000776867]
3 [0000776867]
4 [0000776867]
5 [0000776867]
8-K [0000776867]
SC 13D [0000776867]
SC 13G [0000776867]
Form 13D/13G Filer Form 13D/13G Subject Filed
Vanguard Capital Management LLC White Mountains Insurance Group Ltd [2026-04-30]
Neuberger Berman Group LLC White Mountains Insurance Group Ltd [2026-02-05]
White Mountains Insurance Group Ltd Mediaalpha Inc [2023-06-30]
Fuller & Thaler Asset Management Inc White Mountains Insurance Group Ltd [2023-02-14]
Dimensional Fund Advisors LP White Mountains Insurance Group Ltd [2023-02-10]
White Mountains Insurance Group Ltd Mediaalpha Inc [2023-02-10]
River Road Asset Management LLC White Mountains Insurance Group Ltd [2023-02-08]
White Mountains Insurance Group Ltd Mediaalpha Inc [2021-02-12]
Eaton Vance Management White Mountains Insurance Group Ltd [2021-02-12]
River Road Asset Management LLC White Mountains Insurance Group Ltd [2021-02-10]
View All
Form 3/4/5 Subject 2011 - 2026
White Mountains Insurance Group Ltd
Shank Suzanne F
Tanner David Allen
Campbell Reid Tarlton
Carlson Peter M
Choksi Mary C
Chu John
Dillon Margaret
Gelston Philip A
Hicks Weston M
View All
Insider Transaction (Form 3/4/5) Date Action Shares Price Value ($)
White Mountains Insurance Group Ltd WTM
Common Shares
2026-03-19 Gift 50 $0.00
White Mountains Insurance Group Ltd WTM
Common Shares
2026-03-04 Gift 225 $0.00
White Mountains Insurance Group Ltd WTM
Common Shares (restricted)
2026-02-25 Grant 775 $0.00
White Mountains Insurance Group Ltd WTM
Common Shares (Restricted)
2026-02-25 Grant 1,500 $0.00
White Mountains Insurance Group Ltd WTM
Common Shares (restricted)
2026-02-25 Grant 775 $0.00
White Mountains Insurance Group Ltd WTM
Common Shares (Restricted)
2026-02-25 Grant 600 $0.00
White Mountains Insurance Group Ltd WTM
Common Shares (Restricted)
2026-02-25 Grant 500 $0.00
White Mountains Insurance Group Ltd WTM
Common Shares
2026-01-01 Tax withheld 398 $2,078.03 827,056
White Mountains Insurance Group Ltd WTM
Common Shares
2026-01-01 Tax withheld 274 $2,078.03 569,380
White Mountains Insurance Group Ltd WTM
Common Shares
2026-01-01 Tax withheld 131 $2,078.03 272,222
White Mountains Insurance Group Ltd WTM
Common Shares
2026-01-01 Tax withheld 425 $2,078.03 883,163
White Mountains Insurance Group Ltd WTM
Common Shares
2025-12-23 Gift 60 $0.00
White Mountains Insurance Group Ltd WTM
Common Shares
2025-12-19 Sell 5,000 $2,050.00 10,250,000
White Mountains Insurance Group Ltd WTM
Common Shares
2025-12-19 Sell 5,000 $0.00
White Mountains Insurance Group Ltd WTM
Common Shares
2025-12-16 Sell 165 $2,048.51 338,004
White Mountains Insurance Group Ltd WTM
Common Shares
2025-11-25 Gift 50 $0.00
White Mountains Insurance Group Ltd WTM
Common Shares
2025-11-10 Gift 4 $0.00
White Mountains Insurance Group Ltd WTM
Common Shares
2025-05-22 Grant 150 $0.00
White Mountains Insurance Group Ltd WTM
Common Shares
2025-05-22 Grant 150 $0.00
White Mountains Insurance Group Ltd WTM
Common Shares
2025-05-22 Grant 150 $0.00
showing 20 of 200 most recent transactions
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