Gayner Thomas Sinnickson insider trades
Gayner Thomas Sinnickson has filed 49 Form 4s with the SEC that we hold, for Markel Group INC. (MKL) (Chief Executive Officer, Director), Cable One, Inc. (CABO) (Director), Graham Holdings Co (GHC) (Director) and Coca Cola Co (KO) (Director), among 5 companies in all. Across all of them we count 27 purchases worth $19.9M and 0 sales worth $0 reported on Form 4. None of these purchases or sales is dated in the last 12 months. The largest single trade was a purchase of 5,000 shares of Cable One, Inc. worth $6.5M, dated 2022-06-01. The first filing on our record is dated 2021-07-01 and the latest 2026-05-19.
Markel Group INC. (MKL)
| Trade date | Code | Shares | Value as filed | Filed |
|---|---|---|---|---|
| 2021-11-22 | P, purchase reported on Form 4 | 25 | $31.3K | 2021-11-23 |
| 2022-05-09 | P, purchase reported on Form 4 | 50 | $65.3K | 2022-05-09 |
| 2022-08-04 | P, purchase reported on Form 4 | 50 | $60.1K | 2022-08-05 |
| 2022-11-08 | P, purchase reported on Form 4 | 50 | $61.5K | 2022-11-09 |
| 2023-02-03 | P, purchase reported on Form 4 | 25 | $32.9K | 2023-02-06 |
| 2023-05-02 | P, purchase reported on Form 4 | 50 | $68.0K | 2023-05-03 |
| 2023-08-04 | P, purchase reported on Form 4 | 100 | $147.9K | 2023-08-07 |
| 2023-11-03 | P, purchase reported on Form 4 | 100 | $131.2K | 2023-11-06 |
| 2024-02-02 | P, purchase reported on Form 4 | 100 | $141.5K | 2024-02-05 |
| 2024-11-01 | P, purchase reported on Form 4 | 100 | $155.0K | 2024-11-05 |
| 2025-02-07 | P, purchase reported on Form 4 | 100 | $200.8K | 2025-02-07 |
Cable One, Inc. (CABO)
| Trade date | Code | Shares | Value as filed | Filed |
|---|---|---|---|---|
| 2022-05-25 | P, purchase reported on Form 4 | 50 | $62.9K | 2022-05-27 |
| 2022-06-01 | P, purchase reported on Form 4 | 5,000 | $6.5M | 2022-06-03 |
| 2022-08-24 | P, purchase reported on Form 4 | 50 | $61.2K | 2022-08-25 |
| 2022-08-29 | P, purchase reported on Form 4 | 500 | $588.9K | 2022-08-31 |
| 2022-09-06 | P, purchase reported on Form 4 | 500 | $553.2K | 2022-09-07 |
| 2022-09-12 | P, purchase reported on Form 4 | 500 | $547.4K | 2022-09-13 |
| 2022-11-08 | P, purchase reported on Form 4 | 5,000 | $3.4M | 2022-11-10 |
| 2022-11-09 | P, purchase reported on Form 4 | 5,000 | $3.2M | 2022-11-10 |
| 2022-11-14 | P, purchase reported on Form 4 | 5,000 | $3.6M | 2022-11-15 |
| 2023-03-06 | P, purchase reported on Form 4 | 100 | $70.9K | 2023-03-07 |
Graham Holdings Co (GHC)
| Trade date | Code | Shares | Value as filed | Filed |
|---|---|---|---|---|
| 2021-11-11 | P, purchase reported on Form 4 | 100 | $59.5K | 2021-11-15 |
| 2022-09-16 | P, purchase reported on Form 4 | 100 | $55.6K | 2022-09-16 |
| 2023-05-09 | P, purchase reported on Form 4 | 100 | $58.2K | 2023-05-09 |
| 2023-09-08 | P, purchase reported on Form 4 | 100 | $57.0K | 2023-09-12 |
| 2023-11-09 | P, purchase reported on Form 4 | 100 | $60.7K | 2023-11-09 |
| 2024-09-12 | P, purchase reported on Form 4 | 100 | $74.3K | 2024-09-13 |
Coca Cola Co (KO)
No purchase or sale of common stock reported here; these filings cover grants, option exercises or other codes.
Enovis CORP (CFX)
No purchase or sale of common stock reported here; these filings cover grants, option exercises or other codes.
Counted from the Form 4 filings this reporting owner (SEC CIK 1159015) filed on EDGAR. Values are the transaction values as filed. See every filing on EDGAR, or browse insider buying and today's insider purchases.
Source: U.S. Securities and Exchange Commission (EDGAR) and other official
government data · Updated 2026-10-12 ·
For informational purposes only, not investment advice.
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