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WTMWHITE MOUNTAINS INSURANCE GROUP LTD

Market cap
$5.31B
as of 2026-10-23
Latest close
$2,225.24
as of 2026-10-23
Sector
Financial Services
as of 2026-10-24
Industry
Insurance - Property & Casualty
as of 2026-10-24

Cluster

No cluster in the last 90 days under the default rule (14d · ≥2 insiders · all roles).

Form 4 historysince 2023-11-20

Dashed line = amended filing (Form 4/A)

InsiderTradedFiledTypeSharesPriceValueOwned after10b5-1 planFiling
Tanner David AllenAug 31Aug 31G2$0.00$02,012NoForm 4
Klar StephenAug 26Aug 27A113$0.00$0113NoForm 4
Campbell Reid TarltonMay 21May 22A135$0.00$010,575NoForm 4
Carlson Peter MMay 21May 22A135$0.00$0852NoForm 4
Choksi Mary CMay 21May 22A135$0.00$01,993NoForm 4
Chu JohnMay 21May 22A135$0.00$0335NoForm 4
Dillon MargaretMay 21May 22A135$0.00$01,080NoForm 4
Gelston Philip AMay 21May 22A135$0.00$01,703NoForm 4
Hicks Weston MMay 21May 22A190$0.00$02,936NoForm 4
Shank Suzanne F.May 21May 22A135$0.00$01,006NoForm 4
Tanner David AllenMay 21May 22A135$0.00$02,014NoForm 4
Seelig Robert LawrenceEVP & General CounselMar 19Mar 20G50$0.00$017,857NoForm 4
Tanner David AllenMar 4Mar 5G225$0.00$01,879NoForm 4
Seelig Robert LawrenceEVP & General CounselFeb 25Feb 27A775$0.00$02,500NoForm 4
Papamichael Michael AChief Financial OfficerFeb 25Feb 27A500$0.00$01,200NoForm 4
Hildreth MichaelaMD & Chief Accounting OfficerFeb 25Feb 27A600$0.00$01,825NoForm 4
Harrison Giles EPresidentFeb 25Feb 27A775$0.00$02,675NoForm 4
Caffrey Liam PChief Executive OfficerFeb 25Feb 27A1,500$0.00$03,650NoForm 4
Hildreth MichaelaMD & Chief Accounting OfficerJan 1Jan 5F274$2,078.03$569,3802,491NoForm 4
Caffrey Liam PChief Executive OfficerJan 1Jan 2F425$2,078.03$883,1631,655NoForm 4
Seelig Robert LawrenceEVP & General CounselJan 1Jan 2F398$2,078.03$827,05617,907NoForm 4
Papamichael Michael AChief Financial OfficerJan 1Jan 2F131$2,078.03$272,222772NoForm 4
Hildreth MichaelaMD & Chief Accounting OfficerDec 23, 2025Dec 23, 2025G60$0.00$02,165NoForm 4
Rountree George ManningChief Executive OfficerDec 19, 2025Dec 22, 2025S5,000$2,050.00Sale −$10,250,00013,809NoForm 4
Campbell Reid TarltonDec 19, 2025Dec 22, 20254/AS5,000$2,050.00Sale −$10,250,00010,440NoForm 4/A
Gelston Philip ADec 16, 2025Dec 16, 2025S165$2,048.51Sale −$338,0041,568NoForm 4
Campbell Reid TarltonNov 25, 2025Nov 26, 2025G50$0.00$015,440NoForm 4
Tanner David AllenNov 10, 2025Nov 10, 2025G4$0.00$02,104NoForm 4
Shank Suzanne F.May 22, 2025May 27, 2025A150$0.00$0871NoForm 4
Campbell Reid TarltonMay 22, 2025May 23, 2025A150$0.00$015,490NoForm 4
Carlson Peter MMay 22, 2025May 23, 2025A150$0.00$0717NoForm 4
Choksi Mary CMay 22, 2025May 23, 2025A150$0.00$01,858NoForm 4
Dillon MargaretMay 22, 2025May 23, 2025A150$0.00$0945NoForm 4
Gelston Philip AMay 22, 2025May 23, 2025A150$0.00$01,733NoForm 4
Hicks Weston MMay 22, 2025May 23, 2025A210$0.00$02,746NoForm 4
Tanner David AllenMay 22, 2025May 23, 2025A150$0.00$02,108NoForm 4
Yi StevenMay 22, 2025May 23, 2025A150$0.00$0525NoForm 4
Hildreth MichaelaMD & Chief Accounting OfficerFeb 26, 2025Feb 28, 2025A625$0.00$01,825NoForm 4
Seelig Robert LawrenceEVP & General CounselFeb 26, 2025Feb 28, 2025A825$0.00$02,725NoForm 4
Harrison Giles EEVP & Chief Strategy OfficerFeb 26, 2025Feb 28, 2025A900$0.00$01,900NoForm 4
Caffrey Liam PEVP& Chief Financial OfficerFeb 26, 2025Feb 28, 2025A1,025$0.00$03,400NoForm 4
Rountree George ManningChief Executive OfficerFeb 26, 2025Feb 28, 2025A1,625$0.00$05,425NoForm 4
Hildreth MichaelaMD & Chief Accounting OfficerJan 1, 2025Jan 3, 2025F323$1,945.06$628,2542,225NoForm 4
Seelig Robert LawrenceEVP & General CounselJan 1, 2025Jan 3, 2025F496$1,945.06$964,75017,305NoForm 4
Caffrey Liam PPresident & CFOJan 1, 2025Jan 3, 2025F420$1,945.06$816,925830NoForm 4
Rountree George ManningChief Executive OfficerJan 1, 2025Jan 3, 2025F1,067$1,945.06$2,075,37918,809NoForm 4
Hildreth MichaelaMD & Chief Accounting OfficerNov 29, 2024Dec 2, 2024G75$0.00$01,798NoForm 4
Harrison Giles EEVP & Chief Strategy OfficerJun 10, 2024Jun 10, 2024A1,000$0.00$01,000NoForm 4
Hicks Weston MMay 23, 2024May 24, 2024A230$0.00$02,536NoForm 4
Campbell Reid TarltonMay 23, 2024May 24, 2024A165$0.00$015,340NoForm 4
Carlson Peter MMay 23, 2024May 24, 2024A165$0.00$01,133NoForm 4
Choksi Mary CMay 23, 2024May 24, 2024A165$0.00$01,708NoForm 4
Dillon MargaretMay 23, 2024May 24, 2024A165$0.00$0795NoForm 4
Gelston Philip AMay 23, 2024May 24, 2024A165$0.00$01,583NoForm 4
Shank Suzanne F.May 23, 2024May 24, 2024A165$0.00$0721NoForm 4
Tanner David AllenMay 23, 2024May 24, 2024A165$0.00$01,958NoForm 4
Yi StevenMay 23, 2024May 24, 2024A165$0.00$0375NoForm 4
Campbell Reid TarltonMar 21, 2024Mar 21, 2024G55$0.00$015,175NoForm 4
Campbell Reid TarltonFeb 22, 2024Feb 23, 2024A45$0.00$015,230NoForm 4
Hildreth MichaelaMD & Chief Accounting OfficerFeb 22, 2024Feb 23, 2024A600$0.00$01,950NoForm 4
Seelig Robert LawrenceEVP & General CounselFeb 22, 2024Feb 23, 2024A900$0.00$03,150NoForm 4
Caffrey Liam PEVP& Chief Financial OfficerFeb 22, 2024Feb 23, 2024A1,125$0.00$03,625NoForm 4
Rountree George ManningChief Executive OfficerFeb 22, 2024Feb 23, 2024A1,800$0.00$06,500NoForm 4
Hildreth MichaelaMD & Chief Accounting OfficerJan 1, 2024Jan 2, 2024F261$1,505.01$392,8081,873NoForm 4
Seelig Robert LawrenceEVP & General CounselJan 1, 2024Jan 2, 2024F399$1,505.01$600,49916,551NoForm 4
Campbell Reid TarltonPresidentJan 1, 2024Jan 2, 2024F710$1,505.01$1,068,55715,185NoForm 4
Rountree George ManningChief Executive OfficerJan 1, 2024Jan 2, 2024F1,068$1,505.01$1,607,35117,176NoForm 4
Hildreth MichaelaMD & Chief Accounting OfficerDec 1, 2023Dec 1, 2023G100$0.00$01,534NoForm 4
Hicks Weston MNov 17, 2023Nov 20, 20234/AP52$1,476.15Purchase +$76,7601,358NoForm 4/A
Hicks Weston MNov 17, 2023Nov 20, 20234/AP120$1,476.74Purchase +$177,2091,478NoForm 4/A
Hicks Weston MNov 17, 2023Nov 20, 20234/AP579$1,479.88Purchase +$856,8512,057NoForm 4/A
Hicks Weston MNov 17, 2023Nov 20, 20234/AP11$1,483.43Purchase +$16,3182,068NoForm 4/A
Hicks Weston MNov 17, 2023Nov 20, 20234/AP238$1,484.96Purchase +$353,4202,306NoForm 4/A