Gayner Thomas Sinnickson (CIK 0001159015)

Latest company ownership

Shares held
57,515.45
Last filed at
Dec 3, 2025
Confidence Score
48.3
2025Q4
Confidence Score History
2016Q1 2025Q4
Role: Director
Shares held
29,120
Last filed at
Mar 13, 2023
Confidence Score
50.0
2025Q4
Confidence Score History
2022Q2 2025Q4
Role: Director
Shares held
5,600
Last filed at
May 9, 2023
Confidence Score
50.0
2025Q4
Confidence Score History
2021Q4 2025Q4

Recent buy/sell transactions

Exec date Filing date Company Role Signal Confidence Shares % of shares Under plan? Amount (USD)
Dec 2, 2025 Dec 3, 2025 MARKEL GROUP INC. CEO Sell 47.5 -36 -0.06% $75.5K
Feb 7, 2025 Feb 7, 2025 MARKEL GROUP INC. CEO Buy 60.0 +100 0.18% $200.8K
Dec 5, 2024 Dec 9, 2024 MARKEL GROUP INC. CEO Sell 47.5 -45 -0.08% $79.2K
Nov 1, 2024 Nov 5, 2024 MARKEL GROUP INC. CEO Buy 60.0 +100 0.19% $155K
Sep 12, 2024 Sep 13, 2024 Graham Holdings Co Director Buy 82.5 +100 1.72% $74.3K
Feb 2, 2024 Feb 5, 2024 MARKEL GROUP INC. CEO Buy 60.0 +100 0.20% $141.5K
Dec 5, 2023 Dec 6, 2023 MARKEL GROUP INC. CEO Sell 47.5 -46 -0.09% $64.5K
Nov 9, 2023 Nov 9, 2023 Graham Holdings Co Director Buy 82.5 +100 1.75% $60.7K
Nov 3, 2023 Nov 6, 2023 MARKEL GROUP INC. CEO Buy 60.0 +100 0.20% $131.2K
Sep 8, 2023 Sep 12, 2023 Graham Holdings Co Director Buy 82.5 +100 1.79% $57K
Aug 4, 2023 Aug 7, 2023 MARKEL GROUP INC. CEO Buy 60.0 +100 0.20% $147.9K
May 9, 2023 May 9, 2023 Graham Holdings Co Director Buy 82.5 +100 1.82% $58.2K
May 2, 2023 May 3, 2023 MARKEL GROUP INC. CEO Buy 60.0 +50 0.10% $68K
Mar 6, 2023 Mar 7, 2023 Cable One, Inc. Director Buy 65.0 +100 0.34% $70.9K
Feb 3, 2023 Feb 6, 2023 MARKEL GROUP INC. CEO Buy 56.3 +25 0.05% $32.9K
Dec 6, 2022 Dec 7, 2022 MARKEL GROUP INC. CEO Sell 47.5 -43 -0.09% $56.6K
Nov 14, 2022 Nov 15, 2022 Cable One, Inc. Director Buy 100.0 +5,000 20.82% $3.6M
Nov 8, 2022 Nov 10, 2022 Cable One, Inc. Director Buy 100.0 +10,000 71.33% $6.6M
Nov 8, 2022 Nov 9, 2022 MARKEL GROUP INC. CEO Buy 60.0 +50 0.11% $61.5K
Sep 16, 2022 Sep 16, 2022 Graham Holdings Co Director Buy 82.5 +100 1.85% $55.6K
Sep 12, 2022 Sep 13, 2022 Cable One, Inc. Director Buy 90.0 +500 3.70% $547.4K
Sep 6, 2022 Sep 7, 2022 Cable One, Inc. Director Buy 90.0 +500 3.84% $553.2K
Aug 29, 2022 Aug 31, 2022 Cable One, Inc. Director Buy 90.0 +500 3.99% $588.9K
Aug 24, 2022 Aug 25, 2022 Cable One, Inc. Director Buy 65.0 +50 0.40% $61.3K
Aug 4, 2022 Aug 5, 2022 MARKEL GROUP INC. CEO Buy 60.0 +50 0.11% $60.1K
Jun 1, 2022 Jun 3, 2022 Cable One, Inc. Director Buy 100.0 +5,000 66.94% $6.5M
May 25, 2022 May 27, 2022 Cable One, Inc. Director Buy 72.5 +50 0.67% $62.9K
May 9, 2022 May 9, 2022 MARKEL GROUP INC. CEO Buy 60.0 +50 0.11% $65.3K
Dec 7, 2021 Dec 9, 2021 MARKEL GROUP INC. CEO Sell 51.3 -32 -0.07% $40K
Nov 22, 2021 Nov 23, 2021 MARKEL GROUP INC. CEO Buy 56.3 +25 0.06% $31.3K
Nov 11, 2021 Nov 15, 2021 Graham Holdings Co Director Buy 82.5 +100 1.89% $59.5K
Dec 3, 2019 Dec 10, 2020 MARKEL GROUP INC. CEO Sell 51.3 -44 -0.10% $46K
Dec 4, 2018 Dec 7, 2018 MARKEL GROUP INC. CEO Sell 47.5 -56 -0.14% $63.6K
Jan 16, 2018 Jan 18, 2018 MARKEL GROUP INC. CEO Sell 51.3 -9 -0.02% $10.2K
Dec 5, 2017 Dec 7, 2017 MARKEL GROUP INC. CEO Sell 47.5 -57 -0.15% $63.3K
May 13, 2016 May 17, 2016 MARKEL GROUP INC. CEO Sell 17.5 -1,797 -4.46% $1.7M
Mar 10, 2016 Mar 14, 2016 MARKEL GROUP INC. CEO Buy 47.5 +0 0.00% $55
Feb 16, 2016 Feb 18, 2016 MARKEL GROUP INC. CEO Sell 17.5 -5,000 -11.22% $4.1M