Brian J. Costanzo

Companies

• Markel CorporationChief financial officer Jan 17, 2024 to now¹
• Markel CorporationCAO and Controller Aug 23, 2021 to Dec 6, 2023²

Holdings

Stock this person has reported owning, from the forms officers and directors file with the SEC. See the biggest insider stakes.

Shares held

• Markel Corporation MKL1,862 shares³$3.5M at $1,874.82Jul 16, 2026

As of each latest filing. The line shows shares held over time.

Recent filings

• Jun 30, 2026Other 2 shares at $1,617.19 of Markel Corporation³
• May 15, 2026Other 30 shares at $1,659.60 of Markel Corporation⁴
• May 15, 2026Shares withheld for tax 13 shares at $1,844.00 of Markel Corporation⁴
• Mar 31, 2026Other 2 shares at $1,626.96 of Markel Corporation⁵
• Feb 24, 2026Granted 655 shares of Markel Corporation⁶
• Dec 31, 2025Other 2 shares at $1,602.62 of Markel Corporation⁷
• Dec 2, 2025Shares withheld for tax 22 shares at $2,060.83 of Markel Corporation⁸
• Sep 30, 2025Other 2 shares at $1,624.66 of Markel Corporation⁹
• Jun 30, 2025Other 2 shares at $1,580.87 of Markel Corporation¹⁰
• Mar 31, 2025Other 2 shares at $1,459.76 of Markel Corporation¹¹
• Feb 18, 2025Granted 379 shares of Markel Corporation¹²
• Dec 31, 2024Other 2 shares at $1,336.81 of Markel Corporation¹³
• Dec 5, 2024Shares withheld for tax 21 shares at $1,759.04 of Markel Corporation¹⁴
• Sep 30, 2024Other 2 shares at $1,333.29 of Markel Corporation¹⁵
• Jun 28, 2024Other 2 shares at $1,282.46 of Markel Corporation¹⁶
• Mar 28, 2024Other 2 shares at $1,220.99 of Markel Corporation¹⁷
• Feb 20, 2024Granted 108 shares of Markel Corporation¹⁸
• Feb 20, 2024Granted 94 shares of Markel Corporation¹⁹
• Dec 29, 2023Other 2 shares at $1,206.92 of Markel Corporation²⁰
• Dec 5, 2023Shares withheld for tax 15 shares at $1,401.29 of Markel Corporation²¹
• Sep 29, 2023Other 2 shares at $1,164.51 of Markel Corporation²²
• Jun 30, 2023Other 1 shares at $1,101.99 of Markel Corporation²³
• May 16, 2023Granted 29 shares of Markel Corporation²⁴
• Mar 31, 2023Other 1 shares at $1,085.80 of Markel Corporation²⁵
• Feb 14, 2023Granted 54 shares of Markel Corporation²⁶