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TG

Thomas Sinnickson Gayner

GHC
DIRECTOR · GRAHAM HOLDINGS CO · CIK 0001159015
FILING MIX · LIFETIME85%/15%
BUYS
46
SELLS
8
TOTAL VALUE
$22.18M
COMPANIES
4
ACTIVE SINCE
Dec 2019
HOLDINGS NOW
74,613
AVG SELL PX
$1,716.16
TRADE KIND
SHOWING 54 / 54
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
27 backtested trades · 8 horizons · 3 pendingHow are these numbers computed? →
Forward-return performance of every backtestable P/S trade by Thomas Sinnickson Gayner, measured at 8 horizons from 7 days to 2 years. Deduped per economic event so co-filings count once. Excess return = trade return minus SPY return over the same window.
HORIZONTRADESWIN RATEINSIDER RETURNSPY RETURNMEAN EXCESSMEDIAN EXCESST-STAT
7d27+62.96%+0.64%+0.46%+0.18%-0.21%—
14d27+59.26%+0.86%+0.02%+0.84%+0.93%—
30d27+62.96%-0.49%-0.45%-0.04%+1.54%—
60d27+62.96%+0.49%+0.23%+0.26%+3.85%—
90d27+62.96%+0.47%+3.15%-2.68%+0.19%—
180d27+62.96%-2.61%+3.73%-6.33%-1.23%—
1y27+62.96%-0.76%+15.69%-16.45%-13.93%—
2y27(3 pending)+58.33%-0.54%+42.75%-43.29%-13.45%—
How to read this: Insider Returnis the average raw return of the filer's trades over the horizon. SPY Return is what SPY did over those same windows — reference only, not a comparison. The headline alpha number is Mean Excess = Insider − SPY; green means the filer beat SPY, red means they trailed it. Win rate is the share of individual trades where the filer beat SPY. T-statvalues above 2 mean the alpha is unlikely to be chance given the sample size. "Pending" counts trades where the horizon hasn't elapsed yet; their stats are not included in the row average.
Holdings over time
GHC · 700 shares · as of Sep 12, 2024
01,4002,8004,2005,600202220232024SHARES HELD
Trading cadence · quarterly flow
BUY ● SELL ●
2019
2020
2020
2020
2020
2021
2021
2021
2021
2022
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
FLOW · 46 buys / 8 sellsCOVERAGE · 27 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
MKL
MARKEL GROUP INC.
SALE
Chief Executive Officer
481.668$1,844.00$888.2K56,259.665May 15, 2026May 19, 2026 ↗View →
KO
COCA COLA CO
PURCHASEGRANT
Stock grant
3,825.353$75.81$290.0K15,232.313Apr 1, 2026Apr 3, 2026 ↗View →
MKL
MARKEL GROUP INC.
PURCHASEGRANT
Stock grant
4,483.616——56,741.333Feb 24, 2026Feb 26, 2026 ↗View →
MKL
MARKEL GROUP INC.
SALE
Chief Executive Officer
36.613$2,060.83$75.5K52,257.717Dec 2, 2025Dec 3, 2025 ↗View →
KO
COCA COLA CO
PURCHASEGRANT
Stock grant
4,053.11$71.55$290.0K11,056.474Apr 1, 2025Apr 2, 2025 ↗View →
MKL
MARKEL GROUP INC.
PURCHASEGRANT
Stock grant
3,349.829——52,294.33Feb 18, 2025Feb 20, 2025 ↗View →
MKL
MARKEL GROUP INC.
PURCHASE
Chief Executive Officer
100$2,008.01$200.8K48,944.501Feb 7, 2025Feb 7, 2025 ↗View →
MKL
MARKEL GROUP INC.
SALE
Chief Executive Officer
45$1,759.04$79.2K48,844.501Dec 5, 2024Dec 9, 2024 ↗View →
MKL
MARKEL GROUP INC.
PURCHASE
Chief Executive Officer
100$1,549.72$155.0K48,889.501Nov 1, 2024Nov 5, 2024 ↗View →
GHC
GRAHAM HOLDINGS CO
PURCHASE
100$743.30$74.3K700Sep 12, 2024Sep 13, 2024 ↗View →
KO
COCA COLA CO
PURCHASEGRANT
Stock grant
4,756.438$60.97$290.0K6,774.862Apr 1, 2024Apr 2, 2024 ↗View →
MKL
MARKEL GROUP INC.
PURCHASEGRANT
Stock grant
2,710——47,748.501Feb 20, 2024Feb 22, 2024 ↗View →
MKL
MARKEL GROUP INC.
PURCHASEGRANT
Stock grant
1,041——48,789.501Feb 20, 2024Feb 27, 2024 ↗View →
MKL
MARKEL GROUP INC.
PURCHASE
Chief Executive Officer
100$1,414.74$141.5K45,038.501Feb 2, 2024Feb 5, 2024 ↗View →
MKL
MARKEL GROUP INC.
SALE
Chief Executive Officer
46$1,401.29$64.5K44,938.501Dec 5, 2023Dec 6, 2023 ↗View →
GHC
GRAHAM HOLDINGS CO
PURCHASE
100$607.24$60.7K600Nov 9, 2023Nov 9, 2023 ↗View →
MKL
MARKEL GROUP INC.
PURCHASE
Chief Executive Officer
100$1,311.92$131.2K44,984.501Nov 3, 2023Nov 6, 2023 ↗View →
GHC
GRAHAM HOLDINGS CO
PURCHASE
100$569.83$57.0K500Sep 8, 2023Sep 12, 2023 ↗View →
MKL
MARKEL GROUP INC.
PURCHASE
Chief Executive Officer
100$1,479.47$147.9K44,884.501Aug 4, 2023Aug 7, 2023 ↗View →
KO
COCA COLA CO
PURCHASEGRANT
Stock grant
1,933.613$62.06$120.0K1,933.613Jul 19, 2023Jul 20, 2023 ↗View →
MKL
MARKEL GROUP INC.
PURCHASEGRANT
Stock grant
1,068——44,784.501May 16, 2023May 18, 2023 ↗View →
GHC
GRAHAM HOLDINGS CO
PURCHASE
100$581.63$58.2K5,600May 9, 2023May 9, 2023 ↗View →
MKL
MARKEL GROUP INC.
PURCHASE
Chief Executive Officer
50$1,359.93$68.0K43,716.501May 2, 2023May 3, 2023 ↗View →
CABO
CABLE ONE, INC.
PURCHASEGRANT
Stock grant
1——2,421Mar 10, 2023Mar 13, 2023 ↗View →
CABO
CABLE ONE, INC.
PURCHASE
100$709.30$70.9K2,420Mar 6, 2023Mar 7, 2023 ↗View →
MKL
MARKEL GROUP INC.
PURCHASEGRANT
Stock grant
1,558——43,666.501Feb 14, 2023Feb 15, 2023 ↗View →
MKL
MARKEL GROUP INC.
PURCHASE
Chief Executive Officer
25$1,317.18$32.9K42,108.501Feb 3, 2023Feb 6, 2023 ↗View →
CABO
CABLE ONE, INC.
PURCHASEGRANT
Stock grant
1——2,320Dec 16, 2022Dec 19, 2022 ↗View →
MKL
MARKEL GROUP INC.
SALE
Co-Chief Executive Officer
43$1,315.34$56.6K42,083.501Dec 6, 2022Dec 7, 2022 ↗View →
CABO
CABLE ONE, INC.
PURCHASE
5,000$714.72$3.57M26,700Nov 14, 2022Nov 15, 2022 ↗View →
CABO
CABLE ONE, INC.
PURCHASE
5,000$639.97$3.20M21,700Nov 9, 2022Nov 10, 2022 ↗View →
MKL
MARKEL GROUP INC.
PURCHASE
Co-Chief Executive Officer
50$1,230.60$61.5K42,126.501Nov 8, 2022Nov 9, 2022 ↗View →
CABO
CABLE ONE, INC.
PURCHASE
5,000$673.75$3.37M16,700Nov 8, 2022Nov 10, 2022 ↗View →
GHC
GRAHAM HOLDINGS CO
PURCHASE
100$556.15$55.6K5,500Sep 16, 2022Sep 16, 2022 ↗View →
CABO
CABLE ONE, INC.
PURCHASE
500$1,094.74$547.4K11,700Sep 12, 2022Sep 13, 2022 ↗View →
CABO
CABLE ONE, INC.
PURCHASE
500$1,106.44$553.2K11,200Sep 6, 2022Sep 7, 2022 ↗View →
CABO
CABLE ONE, INC.
PURCHASE
500$1,177.75$588.9K10,700Aug 29, 2022Aug 30, 2022 ↗View →
CABO
CABLE ONE, INC.
PURCHASE
50$1,225.00$61.2K2,319Aug 24, 2022Aug 25, 2022 ↗View →
MKL
MARKEL GROUP INC.
PURCHASE
Co-Chief Executive Officer
50$1,202.46$60.1K42,076.501Aug 4, 2022Aug 5, 2022 ↗View →
CABO
CABLE ONE, INC.
PURCHASE
5,000$1,291.17$6.46M10,200Jun 1, 2022Jun 3, 2022 ↗View →
CABO
CABLE ONE, INC.
PURCHASE
50$1,257.97$62.9K7,469May 25, 2022May 27, 2022 ↗View →
CABO
CABLE ONE, INC.
PURCHASEGRANT
Stock grant
230——7,419May 20, 2022May 24, 2022 ↗View →
MKL
MARKEL GROUP INC.
PURCHASE
Co-Chief Executive Officer
50$1,306.00$65.3K42,026.501May 9, 2022May 9, 2022 ↗View →
MKL
MARKEL GROUP INC.
PURCHASEGRANT
Stock grant
1,874——41,976.501Feb 15, 2022Feb 17, 2022 ↗View →
MKL
MARKEL GROUP INC.
SALE
Co-Chief Executive Officer
32$1,249.50$40.0K40,102.501Dec 7, 2021Dec 9, 2021 ↗View →
MKL
MARKEL GROUP INC.
PURCHASE
Co-Chief Executive Officer
25$1,251.30$31.3K40,134.501Nov 22, 2021Nov 23, 2021 ↗View →
GHC
GRAHAM HOLDINGS CO
PURCHASE
100$595.17$59.5K5,400Nov 11, 2021Nov 15, 2021 ↗View →
CABO
CABLE ONE, INC.
PURCHASEGRANT
Stock grant
129——7,189May 21, 2021May 25, 2021 ↗View →
MKL
MARKEL GROUP INC.
PURCHASEGRANT
Stock grant
2,015——40,183.501Feb 16, 2021Feb 18, 2021 ↗View →
MKL
MARKEL GROUP INC.
PURCHASEGRANT
Stock grant
1,941——40,109.501Feb 16, 2021Feb 25, 2021 ↗View →
MKL
MARKEL GROUP INC.
SALE
Co-Chief Executive Officer
25$1,000.03$25.0K38,168.501Dec 8, 2020Dec 10, 2020 ↗View →
CABO
CABLE ONE, INC.
PURCHASEGRANT
Stock grant
125——7,060May 15, 2020May 18, 2020 ↗View →
MKL
MARKEL GROUP INC.
PURCHASEGRANT
Stock grant
1,790——38,212.501Feb 18, 2020Feb 20, 2020 ↗View →
MKL
MARKEL GROUP INC.
SALE
Co-Chief Executive Officer
19$1,107.25$21.0K38,193.501Dec 3, 2019Dec 10, 2020 ↗View →
Other insiders · GHC
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About this filer
CIK 0001159015
ROLE
Director
PRIMARY
GHC
COMPANIES
4
ACTIVE SINCE
Dec 2019
MARKETPEEL · /INSIDER/0001159015DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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