Thomas Sinnickson Gayner

Companies

• The Coca-Cola CompanyBoard member Jul 21, 2023 to now¹
• Markel CorporationBoard member Feb 23, 2017 to now²
• Markel CorporationChief executive officer Jan 6, 2016 to Mar 19, 2025³
• Graham Holdings CompanyBoard member Jan 19, 2007 to Sep 13, 2024⁴
• Cable One, Inc.Board member Jun 5, 2015 to Mar 13, 2023⁵
• Colfax CorporationBoard member May 7, 2008 to Jan 4, 2022⁶
• Markel CorporationEVP & Chief Investment Officer Jan 5, 2006 to Dec 3, 2015⁷

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 MKL58,284 shares⁸$107.9M at $1,850.45May 19, 2026
• Graham Holdings Company GHC5,900 shares⁹$7.1M at $1,205.61Sep 13, 2024
• CColfax Corporation ENOV65,060 shares¹⁰$1.3M at $19.91Dec 31, 2021
• The Coca-Cola Company KO5,200 shares¹¹$486.9K at $93.62Apr 3, 2026
• COCable One, Inc. CABO29,120 shares¹²$181.3K at $6.22Mar 13, 2023

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

Recent filings

• May 15, 2026Shares withheld for tax 482 shares at $1,844.00 of Markel Corporation⁸
• Feb 24, 2026Granted 4,484 shares of Markel Corporation¹³
• Dec 2, 2025Shares withheld for tax 37 shares at $2,060.83 of Markel Corporation¹⁴
• Feb 18, 2025Granted 3,350 shares of Markel Corporation¹⁵
• Feb 7, 2025Bought 100 shares at $2,008.01 of Markel Corporation¹⁶
• Dec 5, 2024Shares withheld for tax 45 shares at $1,759.04 of Markel Corporation¹⁷
• Nov 1, 2024Bought 100 shares at $1,549.72 of Markel Corporation¹⁸
• Sep 12, 2024Bought 100 shares at $743.30 of Graham Holdings Company⁹
• Feb 20, 2024Granted 1,041 shares of Markel Corporation¹⁹
• Feb 20, 2024Granted 2,710 shares of Markel Corporation²⁰
• Feb 2, 2024Bought 100 shares at $1,414.74 of Markel Corporation²¹
• Dec 5, 2023Shares withheld for tax 46 shares at $1,401.29 of Markel Corporation²²
• Nov 9, 2023Bought 100 shares at $607.24 of Graham Holdings Company²³
• Nov 3, 2023Bought 100 shares at $1,311.92 of Markel Corporation²⁴
• Sep 8, 2023Bought 100 shares at $569.83 of Graham Holdings Company²⁵
• Aug 4, 2023Bought 100 shares at $1,479.47 of Markel Corporation²⁶
• May 16, 2023Granted 1,068 shares of Markel Corporation²⁷
• May 9, 2023Bought 100 shares at $581.63 of Graham Holdings Company²⁸
• May 2, 2023Bought 50 shares at $1,359.93 of Markel Corporation²⁹
• Mar 10, 2023Granted 1 shares of Cable One, Inc.¹²
• Mar 6, 2023Bought 100 shares at $709.30 of Cable One, Inc.³⁰
• Feb 14, 2023Granted 1,558 shares of Markel Corporation³¹
• Feb 3, 2023Bought 25 shares at $1,317.18 of Markel Corporation³²
• Dec 16, 2022Granted 1 shares of Cable One, Inc.³³
• Dec 6, 2022Shares withheld for tax 43 shares at $1,315.34 of Markel Corporation³⁴