Thomas Sinnickson Gayner

Sits on 4 boards. Last updated September 28, 2026

Time on boards

Boards served
4
Current seats
4
Board service
14 years
Director since
2023

14 years of board service in total across 4 boards, counting each seat separately. Longest: Markel Group Inc., 3 years.

Markel Group Inc. Director ยท Chief Executive Officer
3 years ยท Since 2023
Cable One Inc. Director
3 years ยท Since 2023
3 years ยท Since 2023
3 years ยท Since 2023

Chief executive roles

Markel Group Inc. ยท Chief Executive Officer
Dates unknown

Insider trades

All notable trades →

From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.

Date Company Transaction Shares Price Value
Feb 20, 2024 Markel Group Inc. Grant or award +1,041 โ€” โ€”
Feb 20, 2024 Markel Group Inc. Grant or award +2,710 โ€” โ€”
Feb 2, 2024 Markel Group Inc. Open-market purchase +100 $1,414.74 $141,474
Dec 5, 2023 Markel Group Inc. Shares withheld for tax โˆ’46 $1,401.29 $64,459
Nov 9, 2023 Graham Holdings Company Open-market purchase +100 $607.24 $60,724
Nov 3, 2023 Markel Group Inc. Open-market purchase +100 $1,311.92 $131,192
Sep 8, 2023 Graham Holdings Company Open-market purchase +100 $569.83 $56,983
Aug 4, 2023 Markel Group Inc. Open-market purchase +100 $1,479.47 $147,947
May 16, 2023 Markel Group Inc. Grant or award +1,068 โ€” โ€”
May 9, 2023 Graham Holdings Company Open-market purchase +100 $581.63 $58,163
May 2, 2023 Markel Group Inc. Open-market purchase +50 $1,359.93 $67,997
Mar 10, 2023 Cable One Inc. Grant or award +1 โ€” โ€”
Mar 6, 2023 Cable One Inc. Open-market purchase +100 $709.30 $70,930
Feb 14, 2023 Markel Group Inc. Grant or award +1,558 โ€” โ€”
Feb 3, 2023 Markel Group Inc. Open-market purchase +25 $1,317.18 $32,930

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