Thomas Sinnickson Gayner

CIK: 0001159015

Transaction Breakdown

Open Market Buys (P)3 (30.0%)

High conviction signal

Open Market Sales (S)0 (0.0%)

Position reduction

Option Exercises (M)0 (0.0%)

Derivative conversions

Awards (A)4 (40.0%)

Compensation grants

Other (G, F, J, C, D, …)3 (30.0%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (3)

MKL

MARKEL GROUP INC.

DirectorOfficer

COCA COLA CO

Director

GHC

Graham Holdings Co

Director

Discretionary Trading P&L

Holdings

Transaction History (10 total)

MKL
MARKEL GROUP INC.
May 15, 2026
Tax Payment(F)
Direct
482 shares at avg. $1844.00$888K
KO
COCA COLA CO
Apr 1, 2026
Award(A)
Phantom Share Units
Direct
3.8K shares at avg. $75.81-
MKL
MARKEL GROUP INC.
Feb 24, 2026
Award(A)
Direct
4.5K shares-
MKL
MARKEL GROUP INC.
Dec 2, 2025
Tax Payment(F)
Direct
37 shares at avg. $2060.83$75K
KO
COCA COLA CO
Apr 1, 2025
Award(A)
Phantom Share Units
Direct
4.1K shares at avg. $71.55-
MKL
MARKEL GROUP INC.
Feb 18, 2025
Award(A)
Direct
3.3K shares-
MKL
MARKEL GROUP INC.
Feb 7, 2025
Purchase(P)
Direct
100 shares at avg. $2008.01$201K
MKL
MARKEL GROUP INC.
Dec 5, 2024
Tax Payment(F)
Direct
45 shares at avg. $1759.04$79K
MKL
MARKEL GROUP INC.
Nov 1, 2024
Purchase(P)
Direct
100 shares at avg. $1549.72$155K
GHC
Graham Holdings Co
Sep 12, 2024
Purchase(P)
Direct
100 shares at avg. $743.30$74K

		Type	Shares	Price		Ownership
May 15, 2026	MKL MARKEL GROUP INC.	Tax Payment(F)	482	$1844.00	$888,196	Direct
Apr 1, 2026	KO COCA COLA CO	Award(A) Phantom Share Units	3,825	$75.81	-	Direct
Feb 24, 2026	MKL MARKEL GROUP INC.	Award(A)	4,484	-	$0	Direct
Dec 2, 2025	MKL MARKEL GROUP INC.	Tax Payment(F)	37	$2060.83	$75,453	Direct
Apr 1, 2025	KO COCA COLA CO	Award(A) Phantom Share Units	4,053	$71.55	-	Direct
Feb 18, 2025	MKL MARKEL GROUP INC.	Award(A)	3,350	-	-	Direct
Feb 7, 2025	MKL MARKEL GROUP INC.	Purchase(P)	100	$2008.01	$200,801	Direct
Dec 5, 2024	MKL MARKEL GROUP INC.	Tax Payment(F)	45	$1759.04	$79,157	Direct
Nov 1, 2024	MKL MARKEL GROUP INC.	Purchase(P)	100	$1549.72	$154,972	Direct
Sep 12, 2024	GHC Graham Holdings Co	Purchase(P)	100	$743.30	$74,330	Direct

1-10 of 10 transactions

About GAYNER THOMAS SINNICKSON

GAYNER THOMAS SINNICKSON (SEC CIK 0001159015) files insider reports with the SEC as Chief Executive Officer of MARKEL GROUP INC. (MKL), Director of COCA COLA CO (KO) and Director of Graham Holdings Co (GHC).

Signal8 holds 10 ownership filings by GAYNER THOMAS SINNICKSON, all Form 4s, filed between Sep 13, 2024 and May 19, 2026. Those filings report 10 transactions, from Sep 12, 2024 to May 15, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on GAYNER THOMAS SINNICKSON's filings is in ATLANTA, GA.

Recent filings by GAYNER THOMAS SINNICKSON

May 15, 2026: Tax withholding of MKL shares (Form 4, code F).
Apr 1, 2026: Grant or award of KO derivative securities (Form 4, code A).
Feb 24, 2026: Grant or award of MKL shares (Form 4, code A).
Dec 2, 2025: Tax withholding of MKL shares (Form 4, code F).
Apr 1, 2025: Grant or award of KO derivative securities (Form 4, code A).

Other insiders filing for MARKEL GROUP INC. (MKL)

Costanzo Brian J., Chief Financial Officer
Crowley Andrew G., EVP & Pres., Markel Ventures
Besca Mark, Director
Housel Morgan E., Director
Leopold Diane, Director
MICHAEL JONATHAN E, Director

How to read Form 4 transaction codes