Brian J. Costanzo Markel Corp (MKL) insider trading activity

Brian J. Costanzo is Chief Financial Officer of MARKEL CORP. Currently has a direct ownership of 954 shares of MKL, which is worth approximately $1.97 Million. The most recent transaction as insider was on Dec 02, 2025, when has been sold 21 shares (Common Stock) at a price of $2060.83 per share, resulting in proceeds of $43,277. This information was disclosed in a Form 4 filing with the Securities and Exchange Commission (SEC).

Shares Held (Direct Ownership) 954

2.25% 3M change

61.69% 12M change

Total Value Held $1.97 Million

Brian J. Costanzo Transaction History

Date	Transaction	Value	Shares Traded	Shares Held
Dec 02 2025	SELL Payment of exercise price or tax liability	$43,277 $2060.83 p/Share	21 Reduced 2.15%	954 Common Stock
Sep 30 2025	BUY Other acquisition or disposition	$1,624 $1624.66 p/Share	1 Added 0.1%	976 Common Stock
Jun 30 2025	BUY Other acquisition or disposition	$3,161 $1580.87 p/Share	2 Added 0.2%	974 Common Stock
Mar 31 2025	BUY Other acquisition or disposition	$2,919 $1459.76 p/Share	2 Added 0.21%	972 Common Stock
Feb 18 2025	BUY Grant, award, or other acquisition	-	379 Added 28.12%	969 Common Stock
Dec 31 2024	BUY Other acquisition or disposition	$2,673 $1336.81 p/Share	2 Added 0.34%	590 Common Stock
Dec 05 2024	SELL Payment of exercise price or tax liability	$36,939 $1759.04 p/Share	21 Reduced 3.45%	588 Common Stock

Sep 30 2024	BUY Other acquisition or disposition	$1,333 $1333.29 p/Share	1 Added 0.16%	609 Common Stock
Jun 28 2024	BUY Other acquisition or disposition	$2,564 $1282.46 p/Share	2 Added 0.33%	607 Common Stock
Mar 28 2024	BUY Other acquisition or disposition	$1,220 $1220.99 p/Share	1 Added 0.17%	605 Common Stock
Feb 20 2024	BUY Grant, award, or other acquisition	-	108 Added 15.19%	603 Common Stock
Feb 20 2024	BUY Grant, award, or other acquisition	-	94 Added 15.96%	495 Common Stock
Dec 29 2023	BUY Other acquisition or disposition	$2,413 $1206.92 p/Share	2 Added 0.5%	401 Common Stock
Dec 05 2023	SELL Payment of exercise price or tax liability	$21,019 $1401.29 p/Share	15 Reduced 3.62%	399 Common Stock
Sep 29 2023	BUY Other acquisition or disposition	$2,329 $1164.51 p/Share	2 Added 0.48%	414 Common Stock
Jun 30 2023	BUY Other acquisition or disposition	$1,101 $1101.99 p/Share	1 Added 0.24%	412 Common Stock
May 16 2023	BUY Grant, award, or other acquisition	-	29 Added 6.61%	410 Common Stock
Mar 31 2023	BUY Other acquisition or disposition	$1,085 $1085.8 p/Share	1 Added 0.26%	381 Common Stock
Feb 14 2023	BUY Grant, award, or other acquisition	-	54 Added 12.44%	380 Common Stock
Feb 15 2022	BUY Grant, award, or other acquisition	-	69 Added 17.65%	322 Common Stock

BJC

Brian J. Costanzo

Chief Financial Officer

Glen Allen, VA

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