Reid Tarlton Campbell White Mountains Insurance Group LTD (WTM) insider trading activity

Reid Tarlton Campbell is Director of WHITE MOUNTAINS INSURANCE GROUP LTD. Currently has a direct ownership of 10,440 shares of WTM, which is worth approximately $20.1 Million. The most recent transaction as insider was on Dec 19, 2025, when has been sold 5,000 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) 10.4K

32.6% 3M change

31.94% 12M change

Total Value Held $20.1 Million

REID TARLTON CAMPBELL Transaction History

Date	Transaction	Value	Shares Traded	Shares Held
Dec 19 2025	SELL Open market or private sale	-	5,000 Reduced 32.38%	10,440 Common Shares
Nov 25 2025	SELL Bona fide gift	-	50 Reduced 0.32%	15,440 Common Shares
May 22 2025	BUY Grant, award, or other acquisition	-	150 Added 0.96%	15,490 Common Shares
May 23 2024	BUY Grant, award, or other acquisition	-	165 Added 1.06%	15,340 Common Shares
Mar 21 2024	SELL Bona fide gift	-	55 Reduced 0.36%	15,175 Common Shares
Feb 22 2024	BUY Grant, award, or other acquisition	-	45 Added 0.29%	15,230 Common Shares
Jan 01 2024	SELL Payment of exercise price or tax liability	$1,068,557 $1505.01 p/Share	710 Reduced 4.47%	15,185 Common Shares

Jan 01 2023	SELL Payment of exercise price or tax liability	$1,004,174 $1414.33 p/Share	710 Reduced 4.8%	14,095 Common Shares
Jun 01 2022	SELL Bona fide gift	-	100 Reduced 0.76%	13,005 Common Shares
Jan 01 2022	SELL Payment of exercise price or tax liability	$811,120 $1013.9 p/Share	800 Reduced 5.75%	13,105 Common Shares
Feb 25 2021	BUY Grant, award, or other acquisition	-	1,800 Added 24.32%	5,600 Common Shares (restric...
Jan 01 2021	SELL Payment of exercise price or tax liability	$930,614 $1000.66 p/Share	930 Reduced 7.25%	11,905 Common Shares
Dec 08 2020	SELL Bona fide gift	-	30 Reduced 0.28%	10,835 Common Shares
Feb 27 2020	BUY Grant, award, or other acquisition	-	1,800 Added 23.68%	5,800 Common Shares (restric...
Jan 01 2020	SELL Payment of exercise price or tax liability	$1,165,708 $1115.51 p/Share	1,045 Reduced 8.77%	10,865 Common Shares
Sep 25 2019	SELL Bona fide gift	-	90 Reduced 0.92%	9,660 Common Shares
Feb 28 2019	BUY Grant, award, or other acquisition	-	2,000 Added 24.24%	6,250 Common Shares (restric...
Jan 01 2019	SELL Payment of exercise price or tax liability	$900,575 $857.69 p/Share	1,050 Reduced 9.72%	9,750 Common Shares
Mar 29 2018	SELL Bona fide gift	-	50 Reduced 0.58%	8,550 Common Shares
Mar 01 2018	BUY Grant, award, or other acquisition	-	2,000 Added 23.53%	6,500 Common Shares (restric...
Jan 01 2018	SELL Payment of exercise price or tax liability	$1,085,382 $851.28 p/Share	1,275 Reduced 12.91%	8,600 Common Shares
Dec 26 2017	SELL Bona fide gift	-	100 Reduced 1.38%	7,125 Common Shares

RTC

Reid Tarlton Campbell

Director

Hanover, NH

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