Costanzo Brian J. - Insider Non-Derivative Transactions at MARKEL GROUP INC. (MKL) - (SEC)

Updated on January 3, 2026.

According to recent SEC insider information filed on Dec 2, 2025, Costanzo Brian J.'s relationship to MARKEL GROUP INC. (MKL) is Officer (Chief Financial Officer), and currently has 954.36 shares of Common Stock.

The chart below shows the number of shares owned, and the table shows the recent insider transactions.

You can see similar information for other MKL insiders.

Related Topics: SEC Topic List.

Data Source: SEC.

Costanzo Brian J. - Insider Non-Derivative Transactions of MKL Common Stock

Costanzo Brian J. - Insider Non-Derivative Transactions at MKL

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Date	Transaction	No. of Shares	Price Per Share	Shares Owned After Transactions
Dec 3, 2025	F -- (Common Stock)	21.72	2060.83	954.36
Oct 1, 2025	J -- (Common Stock)	1.85	1624.66	976.08
Jul 1, 2025	J -- (Common Stock)	2.21	1580.87	974.24
Apr 1, 2025	J -- (Common Stock)	2.06	1459.76	972.02
Feb 19, 2025	Acquisition -- (Common Stock)	379.41	0	969.97
Jan 1, 2025	J -- (Common Stock)	2.09	1336.81	590.55
Dec 6, 2024	F -- (Common Stock)	21	1759.04	588.46
Oct 1, 2024	J -- (Common Stock)	1.8	1333.29	609.46
Jun 29, 2024	J -- (Common Stock)	2.18	1282.46	607.66
Mar 29, 2024	J -- (Common Stock)	1.97	1220.99	605.48
Feb 21, 2024	Acquisition -- (Common Stock)	94	0	495.51
Feb 21, 2024	Acquisition -- (Common Stock)	108	0	603.51
Dec 30, 2023	J -- (Common Stock)	2.32	1206.92	401.51
Dec 6, 2023	F -- (Common Stock)	15	1401.29	399.19
Sep 30, 2023	J -- (Common Stock)	2.06	1164.51	414.19
Jul 1, 2023	J -- (Common Stock)	1.37	1101.99	412.13
May 17, 2023	Acquisition -- (Common Stock)	29	0	410.76
Apr 1, 2023	J -- (Common Stock)	1.19	1085.8	381.76
Feb 15, 2023	Acquisition -- (Common Stock)	54	0	380.58