Insiders who reported open-market trades in the last 12 months at the companies Thomas Sinnickson Gayner files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
James Quincey - $144.73M in KO purchases and sales in the last 12 months
John Murphy - $27.14M in KO purchases and sales in the last 12 months
Jennifer K. Mann - $25.97M in KO purchases and sales in the last 12 months
Bruno Pietracci - $19.20M in KO purchases and sales in the last 12 months
Nancy Quan - $11.20M in KO purchases and sales in the last 12 months
Manuel Arroyo - $9.89M in KO purchases and sales in the last 12 months
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Thomas Sinnickson Gayner is a corporate insider, tracked as Chief Executive Officer, Director of MARKEL GROUP INC. (MKL). InsiderAlpha holds 7 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
When did Thomas Sinnickson Gayner last file a Form 4?
The most recent primary Form 4 on record is dated 19 May 2026, one of 7 filings going back to 2024.
Has Thomas Sinnickson Gayner been buying or selling stock?
Recorded transactions: 1 open-market purchase ($155K) and 0 open-market sales across all tracked filings.
Thomas Sinnickson Gayner is Chief Executive Officer, Director of MARKEL GROUP INC. (MKL). 7 SEC Form 4 filings on record going back to 2024, most recently on 19 May 2026. Most recent open-market trade: bought $155K of MKL on 5 November 2024. Lifetime open-market purchases: $155K.
Recent transactions
5
The latest 5 SEC Form 4 transactions reported by Thomas Sinnickson Gayner.
InsiderAlpha's records for Thomas Sinnickson Gayner go back to 2024: 7 primary Form 4 filings, an average of 2.3 per year. The typical open-market purchase is $155K (1 buy totaling $155K). The largest single buy on record is $155K of MKL in 2024. No recorded transaction carries a Rule 10b5-1 plan flag. An absent flag does not establish whether a transaction was pre-arranged or discretionary.
