- Corporate Officers - G
- Gayner Thomas Sinnickson
Insider Trading History of Gayner Thomas Sinnickson
The following table details the insider trading activities
(stock purchases, stock sales, and stock option exercises) of Gayner Thomas Sinnickson since 2013.
This trader's CIK number is 1159015.
At the time of last reporting, Gayner Thomas Sinnickson was the Chief Executive Officer of Markel Group Inc.. (stock ticker symbol MKL).
Also see all insider trading activities at Markel Group Inc..
Note that in the past
GAYNER THOMAS SINNICKSON also reported insider trading activities as an insider of the following companies:
Yearly summary of insider trading at Graham Holdings Co (GHC) by Gayner Thomas Sinnickson
| | Insider Buying | Insider Sales | Option Exercises |
|---|
| Year | Symbol | Shares | Value | Shares | Value | Shares | Value |
|---|
| 2024 | GHC | 100 | $74,330 | 0 | $0 | 0 | $0 |
| 2023 | GHC | 300 | $175,870 | 0 | $0 | 0 | $0 |
| 2021 | GHC | 100 | $59,516 | 0 | $0 | 0 | $0 |
Yearly summary of insider trading at Cable One, Inc. (CABO) by Gayner Thomas Sinnickson
| | Insider Buying | Insider Sales | Option Exercises |
|---|
| Year | Symbol | Shares | Value | Shares | Value | Shares | Value |
|---|
| 2023 | CABO | 100 | $70,930 | 0 | $0 | 0 | $0 |
| 2022 | CABO | 20,600 | $20,193,323 | 0 | $0 | 0 | $0 |
| 2019 | CABO | 0 | $0 | 0 | $0 | 370 | $0 |
| 2018 | CABO | 0 | $0 | 0 | $0 | 233 | $0 |
| 2017 | CABO | 0 | $0 | 0 | $0 | 358 | $0 |
Yearly summary of insider trading at Markel Group Inc. (MKL) by Gayner Thomas Sinnickson
| | Insider Buying | Insider Sales | Option Exercises |
|---|
| Year | Symbol | Shares | Value | Shares | Value | Shares | Value |
|---|
| 2025 | MKL | 100 | $200,801 | 0 | $0 | 0 | $0 |
| 2024 | MKL | 200 | $296,446 | 0 | $0 | 0 | $0 |
| 2023 | MKL | 275 | $380,064 | 0 | $0 | 0 | $0 |
| 2022 | MKL | 100 | $125,423 | 0 | $0 | 0 | $0 |
| 2021 | MKL | 25 | $31,282 | 0 | $0 | 0 | $0 |
| 2012 | MKL | 100 | $43,034 | 0 | $0 | 0 | $0 |
Insider trading activities at 3 companies by Gayner Thomas Sinnickson:
1. Graham Holdings Co (GHC)
2. Cable One, Inc. (CABO)
3. Markel Group Inc. (MKL)
Table 1. Insider trading of Graham Holdings Co (GHC) by Gayner Thomas Sinnickson
| Trade Date | Symbol | Trade Type | Shares | Price ($) | Value ($) |
|---|
| 2024-09-12 | GHC | Buy | 100 | 743.30 | 74,330 |
| 2023-11-09 | GHC | Buy | 100 | 607.24 | 60,724 |
| 2023-09-08 | GHC | Buy | 100 | 569.83 | 56,983 |
| 2023-05-09 | GHC | Buy | 100 | 581.63 | 58,163 |
| 2021-11-11 | GHC | Buy | 100 | 595.17 | 59,516 |
Table 2. Insider trading of Cable One, Inc. (CABO) by Gayner Thomas Sinnickson
| Trade Date | Symbol | Trade Type | Shares | Price ($) | Value ($) |
|---|
| 2023-03-06 | CABO | Buy | 100 | 709.30 | 70,930 |
| 2022-11-08 | CABO | Buy | 5,000 | 673.75 | 3,368,750 |
| 2022-11-09 | CABO | Buy | 5,000 | 639.97 | 3,199,850 |
| 2022-08-29 | CABO | Buy | 500 | 1,177.75 | 588,875 |
| 2022-08-24 | CABO | Buy | 50 | 1,225.00 | 61,250 |
| 2022-06-01 | CABO | Buy | 5,000 | 1,291.17 | 6,455,850 |
| 2022-06-01 | CABO | Buy | 5,000 | 1,291.17 | 6,455,850 |
| 2022-05-25 | CABO | Buy | 50 | 1,257.97 | 62,898 |
| 2019-05-08 | CABO | Option Ex | 370 | .00 | 0 |
| 2018-05-07 | CABO | Option Ex | 49 | .00 | 0 |
| 2018-05-02 | CABO | Option Ex | 184 | .00 | 0 |
| 2017-05-03 | CABO | Option Ex | 358 | .00 | 0 |
Table 3. Insider trading of Markel Group Inc. (MKL) by Gayner Thomas Sinnickson
| Trade Date | Symbol | Trade Type | Shares | Price ($) | Value ($) |
|---|
| 2025-02-07 | MKL | Buy | 100 | 2,008.01 | 200,801 |
| 2024-11-01 | MKL | Buy | 100 | 1,549.72 | 154,972 |
| 2024-02-02 | MKL | Buy | 100 | 1,414.74 | 141,474 |
| 2023-11-03 | MKL | Buy | 100 | 1,311.92 | 131,192 |
| 2023-08-04 | MKL | Buy | 100 | 1,479.47 | 147,947 |
| 2023-05-02 | MKL | Buy | 50 | 1,359.93 | 67,996 |
| 2023-02-03 | MKL | Buy | 25 | 1,317.18 | 32,929 |
| 2022-08-04 | MKL | Buy | 50 | 1,202.46 | 60,123 |
| 2022-05-09 | MKL | Buy | 50 | 1,306.00 | 65,300 |
| 2021-11-22 | MKL | Buy | 25 | 1,251.30 | 31,282 |
| 2012-12-31 | MKL | Buy | 100 | 430.34 | 43,034 |
Insider trading activities including stock purchases, stock sales, and option exercises
listed in the above table cannot be completely guaranteed as to their accuracy.
For more information regarding the trades made by Gayner Thomas Sinnickson
(Chief Executive Officer of Markel Group Inc. at the time of this reporting) see
the Securities and Exchange Commission (SEC) website.