MetaCap

White Mountains Insurance Group Insider Trades

NYSE: WTMFinanceProperty-Casualty InsurersUSD

2,060.63+0.8599 (+0.04%)

At close: Oct 9, 4:00 PM ET · Delayed 15 min

Last 12 months

Purchases
0 · $0
Sales
4 · $20.84M
Shares bought / sold
0 / 15.16K
Net activity
Net selling $20.8 million

White Mountains Insurance Group insider activity

Over the last 12 months, White Mountains Insurance Group insiders reported 29 transactions on SEC Form 4: 0 open-market purchases and 4 sales. Insiders bought $0 and sold $20.8 million worth of stock, for net insider selling of $20.8 million. The largest seller was Rountree George Manning, with $10.3 million in reported sales.

The most recent filing shows Tanner David Allen (Director) reporting a transaction in 2 shares on Aug 31, 2026. Insider sales are common for compensation, tax and diversification reasons, while open-market purchases are rarer; tracking both helps put WTM's ownership changes in context.

Summary generated from market data by MetaCap's automated system. Methodology

WTM insider transactions

White Mountains Insurance Group insider transactions
DateInsiderTypeSharesValueFiling
Aug 31, 2026Tanner David AllenDirectorGift2—Form 4
Aug 26, 2026Klar StephenDirectorAward113—Form 4
May 21, 2026CAMPBELL REID TARLTONDirectorAward135—Form 4
May 21, 2026Carlson Peter MDirectorAward135—Form 4
May 21, 2026Chu JohnDirectorAward135—Form 4
May 21, 2026CHOKSI MARY CDirectorAward135—Form 4
May 21, 2026Dillon MargaretDirectorAward135—Form 4
May 21, 2026Gelston Philip ADirectorAward135—Form 4
May 21, 2026SHANK SUZANNE F.DirectorAward135—Form 4
May 21, 2026Tanner David AllenDirectorAward135—Form 4
May 21, 2026Hicks Weston MDirectorAward190—Form 4
Mar 19, 2026SEELIG ROBERT LAWRENCEEVP & General CounselGift50—Form 4
Mar 4, 2026Tanner David AllenDirectorGift225—Form 4
Feb 25, 2026SEELIG ROBERT LAWRENCEEVP & General CounselAward775—Form 4
Feb 25, 2026Papamichael Michael AChief Financial OfficerAward500—Form 4
Feb 25, 2026Hildreth MichaelaMD & Chief Accounting OfficerAward600—Form 4
Feb 25, 2026Harrison Giles EPresidentAward775—Form 4
Feb 25, 2026Caffrey Liam PChief Executive OfficerAward1,500—Form 4
Jan 1, 2026Caffrey Liam PChief Executive OfficerTax withholding425$883.16KForm 4
Jan 1, 2026Papamichael Michael AChief Financial OfficerTax withholding131$272.22KForm 4
Jan 1, 2026SEELIG ROBERT LAWRENCEEVP & General CounselTax withholding398$827.06KForm 4
Jan 1, 2026Hildreth MichaelaMD & Chief Accounting OfficerTax withholding274$569.38KForm 4
Dec 23, 2025Hildreth MichaelaMD & Chief Accounting OfficerGift60—Form 4
Dec 19, 2025Rountree George ManningChief Executive OfficerSale5,000$10.25MForm 4
Dec 19, 2025CAMPBELL REID TARLTONDirectorSale5,000—Form 4
Dec 19, 2025CAMPBELL REID TARLTONDirectorSale5,000$10.25MForm 4
Dec 16, 2025Gelston Philip ADirectorSale165$338.00KForm 4
Nov 25, 2025CAMPBELL REID TARLTONDirectorGift50—Form 4
Nov 10, 2025Tanner David AllenDirectorGift4—Form 4
May 22, 2025CAMPBELL REID TARLTONDirectorAward150—Form 4
May 22, 2025Carlson Peter MDirectorAward150—Form 4
May 22, 2025CHOKSI MARY CDirectorAward150—Form 4
May 22, 2025Gelston Philip ADirectorAward150—Form 4
May 22, 2025Dillon MargaretDirectorAward150—Form 4
May 22, 2025Hicks Weston MDirectorAward210—Form 4
May 22, 2025Tanner David AllenDirectorAward150—Form 4
May 22, 2025Yi StevenDirectorAward150—Form 4
May 22, 2025SHANK SUZANNE F.DirectorAward150—Form 4
Feb 26, 2025Caffrey Liam PEVP& Chief Financial OfficerAward1,025—Form 4
Feb 26, 2025Rountree George ManningChief Executive OfficerAward1,625—Form 4

Transaction codes follow SEC Form 4: P = open-market purchase, S = open-market sale, A = grant or award, M = option exercise, F = shares withheld for taxes. About Form 4

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