Insider Transactions Reported by 16 Insiders of WHITE MOUNTAINS INSURANCE GROUP LTD

Symbol
WTM on NYSE
Location
Hanover, NH

Insiders trading volume in the past year

WHITE MOUNTAINS INSURANCE GROUP LTD executives and other stock owners filed with the SEC include:

Name Relationship Holdings Value Past Year Net Change Change % Report Date
Robert Lawrence Seelig EVP & General Counsel $37,712,778 25 Feb 2026
George Manning Rountree Chief Executive Officer, Director $28,538,006 -$10,250,000 -26% 19 Dec 2025
Reid Tarlton Campbell Director $21,625,911 -$10,250,000 -32% 19 Dec 2025
Morgan W. Davis Director $11,647,272 28 Dec 2022
Michaela Hildreth MD & Chief Accounting Officer $5,120,405 25 Feb 2026
Weston M. Hicks Director $4,866,186 22 May 2025
David Allen Tanner Director $3,863,900 04 Mar 2026
Liam P. Caffrey Chief Executive Officer, Director $3,391,172 25 Feb 2026
Mary C. Choksi Director $3,292,561 22 May 2025
Philip A. Gelston Director $3,212,063 -$338,004 -9.5% 16 Dec 2025
Margaret Dillon Director $1,674,634 22 May 2025
Michael A. Papamichael Chief Financial Officer $1,598,724 25 Feb 2026
Suzanne F. Shank Director $1,543,499 22 May 2025
Peter M. Carlson Director $1,270,595 22 May 2025
Steven Yi Director $930,352 22 May 2025
Giles E. Harrison President $4,078 25 Feb 2026

Recent Insider Transactions by Companies or Individuals for WHITE MOUNTAINS INSURANCE GROUP LTD

Showing up to 300 most recent insider transactions from the last 12 months.

Insider Symbol Class Transaction % Value $ * Price $ Shares Shares Owned Date Ownership
David Allen Tanner WTM Common Shares Gift -10.7% -225 1,879 04 Mar 2026 Direct
Liam P. Caffrey WTM Common Shares (Restricted) Award 69.8% 1,500 3,650 25 Feb 2026 Direct
Giles E. Harrison WTM Common Shares (restricted) Award 40.8% 775 2,675 25 Feb 2026 Direct
Michaela Hildreth WTM Common Shares (Restricted) Award 49% 600 1,825 25 Feb 2026 Direct
Michael A. Papamichael WTM Common Shares (Restricted) Award 71.4% 500 1,200 25 Feb 2026 Direct
Robert Lawrence Seelig WTM Common Shares (restricted) Award 44.9% 775 2,500 25 Feb 2026 Direct
Michaela Hildreth WTM Common Shares Tax liability -9.91% -274 2,491 01 Jan 2026 Direct
Michael A. Papamichael WTM Common Shares Tax liability -14.5% -131 772 01 Jan 2026 Direct
Robert Lawrence Seelig WTM Common Shares Tax liability -2.17% -398 17,907 01 Jan 2026 Direct
Liam P. Caffrey WTM Common Shares Tax liability -20.4% -425 1,655 01 Jan 2026 Direct
Michaela Hildreth WTM Common Shares Gift -2.7% -60 2,165 23 Dec 2025 Direct
Reid Tarlton Campbell WTM Common Shares Sale -32.4% $10,250,000 $2050.00 -5,000 10,440 19 Dec 2025 Direct
George Manning Rountree WTM Common Shares Sale -26.6% $10,250,000 $2050.00 -5,000 13,809 19 Dec 2025 Direct
Philip A. Gelston WTM Common Shares Sale -9.52% $338,004 $2048.51 -165 1,568 16 Dec 2025 Direct
Reid Tarlton Campbell WTM Common Shares Gift -0.32% -50 15,440 25 Nov 2025 Direct
David Allen Tanner WTM Common Shares Gift -0.19% -4 2,104 10 Nov 2025 Direct
Suzanne F. Shank WTM Common Shares Award 20.8% 150 871 22 May 2025 Direct
Steven Yi WTM Common Shares Award 40% 150 525 22 May 2025 Direct
David Allen Tanner WTM Common Shares Award 7.66% 150 2,108 22 May 2025 Direct
Weston M. Hicks WTM Common Shares Award 8.28% 210 2,746 22 May 2025 Direct
Philip A. Gelston WTM Common Shares Award 9.48% 150 1,733 22 May 2025 Direct
Margaret Dillon WTM Common Shares Award 18.9% 150 945 22 May 2025 Direct
Mary C. Choksi WTM Common Shares Award 8.78% 150 1,858 22 May 2025 Direct
Peter M. Carlson WTM Common Shares Award 26.5% 150 717 22 May 2025 Direct
Reid Tarlton Campbell WTM Common Shares Award 0.98% 150 15,490 22 May 2025 Direct
* An asterisk sign (*) next to the price indicates that the price is likely invalid.