InsidersTradesSigma
Total declarations
Companies
▲ Purchases (26 ops.)
▼ Sales (0 ops.)
Insider track record
OtherDisclosed buys
26
Disclosed sells
0
T+90 hit rate
10%
T+90 mean return
-12.2%
Across 10 buy signals with a settled T+90 return. Return basis: close on the day after publication.
Signal history
Browse the full record of transactions filed by Gayner Thomas Sinnickson. Insider active across 5 companies, notably Colfax CORP. In total, 49 disclosures have been recorded. Breakdown: 26 buys · 0 sell. Total volume traded: €16.1m. History available since 12 May 2021. The latest transaction was filed on 24 February 2026 (Attribution). Regulator: SEC (Form 4). All data is openly available.
Companies and markets linked to Gayner Thomas Sinnickson
Open company profiles for insider transactions, fundamentals and analyst consensus when available.
Declarations49 total
4,483.616 shares0Common StockSEC:0001159015-26-000002:0
36.613 shares@ US$2,060.837.0% of flowCommon StockSEC:0001159015-25-000003:0
3,349.829 shares0Common StockSEC:0001096343-25-000013:0
100 shares@ US$2,008.0122.5% of flowCommon StockSEC:0001096343-25-000010:0
Canonical exit: 8 May 2025 (T+90)
45 shares@ US$1,759.048.8% of flowCommon StockSEC:0001096343-24-000136:0
100 shares@ US$1,549.7216.6% of flowCommon StockSEC:0001096343-24-000125:0
Canonical exit: 30 Jan 2025 (T+90)
100 shares@ US$743.3017.2% of flowClass B Common StockSEC:0000104889-24-000045:0
Canonical exit: 11 Dec 2024 (T+90)
1,041 shares0Common StockSEC:0001096343-24-000030:0
2,710 shares0Common StockSEC:0001096343-24-000013:0
100 shares@ US$1,414.7415.1% of flowCommon StockSEC:0001096343-24-000006:0
Canonical exit: 2 May 2024 (T+90)
46 shares@ US$1,401.296.9% of flowCommon StockSEC:0001096343-23-000214:0
100 shares@ US$607.2414.6% of flowClass B Common StockSEC:0000104889-23-000067:0
Canonical exit: 7 Feb 2024 (T+90)
100 shares@ US$1,311.9214.4% of flowCommon StockSEC:0001096343-23-000204:0
Canonical exit: 1 Feb 2024 (T+90)
100 shares@ US$569.8313.7% of flowClass B Common StockSEC:0000104889-23-000055:0
Canonical exit: 7 Dec 2023 (T+90)
100 shares@ US$1,479.4715.7% of flowCommon StockSEC:0001096343-23-000173:0
Canonical exit: 2 Nov 2023 (T+90)
1,068 shares0Common StockSEC:0001096343-23-000093:0
100 shares@ US$581.6313.6% of flowClass B Common StockSEC:0000104889-23-000037:0
Canonical exit: 7 Aug 2023 (T+90)
50 shares@ US$1,359.9313.6% of flowCommon StockSEC:0001096343-23-000077:0
Canonical exit: 31 Jul 2023 (T+90)
1 shares0Deferred Stock Unit, par value $0.01SEC:0001437749-23-006407:0
100 shares@ US$709.300.5% of flowCommon Stock, par value $0.01SEC:0001437749-23-005667:0
Canonical exit: 4 Jun 2023 (T+90)
1,558 shares0Common StockSEC:0001096343-23-000024:0
25 shares@ US$1,317.186.7% of flowCommon StockSEC:0001096343-23-000006:0
Canonical exit: 4 May 2023 (T+90)
1 shares0Deferred Stock Unit, par value $0.01SEC:0001437749-22-029387:0
43 shares@ US$1,315.3411.9% of flowCommon StockSEC:0001096343-22-000154:0
5,000 shares@ US$714.719723.4% of flowCommon Stock, par value $0.01SEC:0001437749-22-027469:0
Canonical exit: 12 Feb 2023 (T+90)
25 of 49 declarations
About Gayner Thomas Sinnickson
GAYNER THOMAS SINNICKSON is Chief Executive Officer at MARKEL CORP and MARKEL GROUP INC., and Director at Cable One, Inc., Graham Holdings Co and Colfax CORP. He has 49 filings in total, and across the 49 sampled filings, the transactions are acquisitions for EUR 16119872 in total, with no sales, between 2016-01-05 and 2026-02-26.
