David Allen Tanner White Mountains Insurance Group LTD (WTM) insider trading activity

David Allen Tanner is Director of WHITE MOUNTAINS INSURANCE GROUP LTD. Currently has a direct ownership of 2,104 shares of WTM, which is worth approximately $4.05 Million. The most recent transaction as insider was on Nov 10, 2025, when has been sold 4 shares (Common Shares) at a price of $0.0 per share, resulting in proceeds of $0. This information was disclosed in a Form 4 filing with the Securities and Exchange Commission (SEC).

Shares Held (Direct Ownership) 2.1K

0.19% 3M change

7.46% 12M change

Total Value Held $4.05 Million

David Allen Tanner Transaction History

Date	Transaction	Value	Shares Traded	Shares Held
Nov 10 2025	SELL Bona fide gift	-	4 Reduced 0.19%	2,104 Common Shares
May 22 2025	BUY Grant, award, or other acquisition	-	150 Added 6.64%	2,108 Common Shares
May 23 2024	BUY Grant, award, or other acquisition	-	165 Added 7.77%	1,958 Common Shares
May 25 2023	BUY Grant, award, or other acquisition	-	180 Added 9.12%	1,793 Common Shares
May 26 2022	BUY Grant, award, or other acquisition	-	225 Added 12.24%	1,613 Common Shares
May 27 2021	BUY Grant, award, or other acquisition	-	225 Added 13.95%	1,388 Common Shares
May 21 2020	BUY Grant, award, or other acquisition	-	225 Added 16.21%	1,163 Common Shares
May 23 2019	BUY Grant, award, or other acquisition	-	250 Added 21.04%	938 Common Shares
Mar 26 2019	BUY Open market or private purchase	$458,880 $917.76 p/Share	500 Added 42.09%	688 Common Shares
Aug 23 2018	BUY Grant, award, or other acquisition	-	188 Added 50.0%	188 Common Shares

DAT

David Allen Tanner

Director

Hanover, NH

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