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.
Chief executive roles
Shareholder support
Support is votes for as a share of votes for and against (or withheld). Below 80% is a clear protest.
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Graham Holdings Company May 5, 2026100.0%
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Markel Group Inc. May 21, 202597.7%
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Graham Holdings Company May 6, 2025100.0%
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Markel Group Inc. May 22, 202496.6%
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Graham Holdings Company May 7, 2024100.0%
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Markel Group Inc. May 16, 202394.7%
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Graham Holdings Company May 4, 2023100.0%
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 |
|---|---|---|---|---|---|
| May 15, 2026 | Markel Group Inc. | Shares withheld for tax | −482 | $1,844.00 | $888,199 |
| Feb 24, 2026 | Markel Group Inc. | Grant or award | +4,484 | — | — |
| Dec 2, 2025 | Markel Group Inc. | Shares withheld for tax | −37 | $2,060.83 | $75,447 |
| Feb 18, 2025 | Markel Group Inc. | Grant or award | +3,350 | — | — |
| Feb 7, 2025 | Markel Group Inc. | Open-market purchase | +100 | $2,008.01 | $200,801 |
| Dec 5, 2024 | Markel Group Inc. | Shares withheld for tax | −45 | $1,759.04 | $79,157 |
| Nov 1, 2024 | Markel Group Inc. | Open-market purchase | +100 | $1,549.72 | $154,972 |
| Sep 12, 2024 | Graham Holdings Company | Open-market purchase | +100 | $743.30 | $74,330 |
| Feb 20, 2024 | Markel Group Inc. | Grant or award | +1,041 | — | — |
| Feb 20, 2024 | Markel Group Inc. | Grant or award | +2,710 | — | — |
| 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 | −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 |
Questions about Thomas Sinnickson Gayner
What boards is Thomas Sinnickson Gayner on?
Thomas Sinnickson Gayner sits on the boards of Cable One Inc., Graham Holdings Company, Markel Group Inc. and The Coca-Cola Company.
What company is Thomas Sinnickson Gayner the CEO of?
Thomas Sinnickson Gayner is Chief Executive Officer of Markel Group Inc.
How long has Thomas Sinnickson Gayner served on boards?
Our records show at least 14 years of board service across 4 boards, the earliest from 2023.
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