Thomas Sinnickson Gayner serves as Executive at MARKEL CORP, where they oversee executive responsibilities. Since joining the company, Thomas Sinnickson Gayner has executed 151 insider transactions totaling $23.8M, demonstrating a bullish approach to their equity position. Their most recent transaction on Feb 24, 2026 involved receiving (via award) 4,483.62 shares valued at $0.
Thomas Sinnickson Gayner currently holds 56,741.33 shares of MARKEL CORP (MKL), valued at approximately $0. This represents their equity stake as Executive.
Based on SEC Form 4 filings, Thomas Sinnickson Gayner has been a net buyer of MKL stock. They have purchased $19.6M and sold $4.1M worth of shares.
Thomas Sinnickson Gayner's most recent insider trade was on Feb 24, 2026, when they sold 4,483.62 shares at $0.00 per share.
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| $2060.83 |
| Discretionary |
| Sep 12, 2024 | GHC | $74.3K | Purchase | 100 | $743.30 | Discretionary |
| Feb 20, 2024 | MKL | $0 | Award | 2,710 | $N/A | Discretionary |
| Feb 20, 2024 | MKL | $0 | Award | 1,041 | $N/A | Discretionary |
| Feb 2, 2024 | MKL | $141.5K | Purchase | 100 | $1414.74 | Discretionary |
| Dec 5, 2023 | MKL | $64.5K | Payment | 46 | $1401.29 | Discretionary |
| Nov 9, 2023 | GHC | $60.7K | Purchase | 100 | $607.24 | Discretionary |
| Nov 3, 2023 | MKL | $131.2K | Purchase | 100 | $1311.92 | Discretionary |
| Sep 8, 2023 | GHC | $57.0K | Purchase | 100 | $569.83 | Discretionary |
| Aug 4, 2023 | MKL | $147.9K | Purchase | 100 | $1479.47 | Discretionary |
| May 16, 2023 | MKL | $0 | Award | 1,068 | $N/A | Discretionary |
| May 9, 2023 | GHC | $58.2K | Purchase | 100 | $581.63 | Discretionary |
| May 2, 2023 | MKL | $68.0K | Purchase | 50 | $1359.93 | Discretionary |
| Mar 10, 2023 | CABO | $0 | Award | 1 | $N/A | Discretionary |
| Mar 6, 2023 | CABO | $70.9K | Purchase | 100 | $709.30 | Discretionary |
| Feb 14, 2023 | MKL | $0 | Award | 1,558 | $N/A | Discretionary |
| Feb 3, 2023 | MKL | $32.9K | Purchase | 25 | $1317.18 | Discretionary |
| Dec 16, 2022 | CABO | $0 | Award | 1 | $N/A | Discretionary |
| Dec 6, 2022 | MKL | $56.6K | Payment | 43 | $1315.34 | Discretionary |
| Nov 14, 2022 | CABO | $3.6M | Purchase | 5,000 | $714.72 | Discretionary |
| Nov 9, 2022 | CABO | $3.2M | Purchase | 5,000 | $639.97 | Discretionary |
| Nov 8, 2022 | MKL | $61.5K | Purchase | 50 | $1230.60 | Discretionary |
| Nov 8, 2022 | CABO | $3.4M | Purchase | 5,000 | $673.75 | Discretionary |
| Sep 16, 2022 | GHC | $55.6K | Purchase | 100 | $556.15 | Discretionary |
| Sep 12, 2022 | CABO | $547.4K | Purchase | 500 | $1094.74 | Discretionary |
| Sep 6, 2022 | CABO | $553.2K | Purchase | 500 | $1106.44 | Discretionary |
| Aug 29, 2022 | CABO | $588.9K | Purchase | 500 | $1177.75 | Discretionary |
| Aug 24, 2022 | CABO | $61.3K | Purchase | 50 | $1225.00 | Discretionary |
| Aug 4, 2022 | MKL | $60.1K | Purchase | 50 | $1202.46 | Discretionary |