Gayner Thomas Sinnickson

CIK 0001159015

Co-Chief Executive OfficerDirector

Filings

Latest May 19, 2026

Issuers covered

Showing

33 of 33

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Track record

15 of 15 open-market trades scored (100% price coverage). Returns are signed: a +10% move on a sale shows as -10% (insider was wrong).

Horizon	Trades	Win rate	Avg	Median	Best	Worst
30 days	15	73%	+3.0%	+1.6%	+14.2%	-9.4%
90 days	15	67%	+4.1%	+3.8%	+27.7%	-11.3%
180 days	15	67%	+2.2%	+8.2%	+26.5%	-46.6%
365 days	15	80%	+9.2%	+9.6%	+58.6%	-51.2%

Issuers

Companies where Gayner Thomas Sinnickson has filed

Ticker	Issuer	Filings	Last filed
MKL	Markel Group Inc.	19	May 19, 2026
CABO	Cable One, Inc.	5	Mar 13, 2023
KO	Coca Cola Co	4	Apr 3, 2026
GHC	Graham Holdings Co	4	Sep 13, 2024
ENOV	Enovis Corp	1	Jan 4, 2022

All filings

33 Form 4 / 4-A filings, newest first

Filed	Issuer	Top transaction	Shares	Price	Value
May 19, 2026	MKLMarkel Group Inc.	FTax	481.67	$1,844.00	$888,196
Apr 3, 2026	KOCoca Cola Co	Holdings only	-	-	-
Feb 26, 2026	MKLMarkel Group Inc.	AGrant	4,483.62	$0.00	$0
Dec 3, 2025	MKLMarkel Group Inc.	FTax	36.61	$2,060.83	$75,453
Apr 3, 2025	KOCoca Cola Co	Holdings only	-	-	-
Feb 20, 2025	MKLMarkel Group Inc.	AGrant	3,349.83	$0.00	$0
Feb 7, 2025	MKLMarkel Group Inc.	PPurchase	100	$2,008.01	$200,801
Dec 9, 2024	MKLMarkel Group Inc.	FTax	45	$1,759.04	$79,157
Nov 5, 2024	MKLMarkel Group Inc.	PPurchase	100	$1,549.72	$154,972
Sep 13, 2024	GHCGraham Holdings Co	PPurchase	100	$743.30	$74,330
Apr 3, 2024	KOCoca Cola Co	Holdings only	-	-	-
Feb 27, 2024	MKLMarkel Group Inc.	AGrant	1,041	$0.00	$0
Feb 22, 2024	MKLMarkel Group Inc.	AGrant	2,710	$0.00	$0
Feb 5, 2024	MKLMarkel Group Inc.	PPurchase	100	$1,414.74	$141,474
Dec 6, 2023	MKLMarkel Group Inc.	FTax	46	$1,401.29	$64,459
Nov 9, 2023	GHCGraham Holdings Co	PPurchase	100	$607.24	$60,724
Nov 6, 2023	MKLMarkel Group Inc.	PPurchase	100	$1,311.92	$131,192
Sep 12, 2023	GHCGraham Holdings Co	PPurchase	100	$569.83	$56,983
Aug 7, 2023	MKLMarkel Group Inc.	PPurchase	100	$1,479.47	$147,947
Jul 21, 2023	KOCoca Cola Co	Holdings only	-	-	-
May 18, 2023	MKLMarkel Group Inc.	AGrant	1,068	$0.00	$0
May 9, 2023	GHCGraham Holdings Co	PPurchase	100	$581.63	$58,163
May 3, 2023	MKLMarkel Group Inc.	PPurchase	50	$1,359.93	$67,997
Mar 13, 2023	CABOCable One, Inc.	AGrant	1	$0.00	$0
Mar 7, 2023	CABOCable One, Inc.	PPurchase	100	$709.30	$70,930
Feb 15, 2023	MKLMarkel Group Inc.	AGrant	1,558	$0.00	$0
Feb 6, 2023	MKLMarkel Group Inc.	PPurchase	25	$1,317.18	$32,930
Jun 3, 2022	CABOCable One, Inc.	PPurchase	5,000	$1,291.17	$6,455,850
May 27, 2022	CABOCable One, Inc.	PPurchase	50	$1,257.97	$62,899
May 24, 2022	CABOCable One, Inc.	AGrant	230	$0.00	$0
May 9, 2022	MKLMarkel Group Inc.	PPurchase	50	$1,306.00	$65,300
Feb 17, 2022	MKLMarkel Group Inc.	AGrant	1,874	$0.00	$0
Jan 4, 2022	ENOVEnovis Corp	AGrant	490	$0.00	$0

Showing 1-33 of 33

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Real-time Form 4 intelligence. Smarter insider tracking.

Filed		Top transaction	Shares	Price	Value