THOMAS SINNICKSON GAYNER
CIK 1159015 · Chief Executive Officer · last filed 2026-05-19
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
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Disclosed Exposure
$123.45M
Companies
7
Total Filings
163
Lifetime Open-Market Net
$15.86M
Holdings By Company
Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| MKL | Chief Executive Officer | 56,682 | $2019.84 | $114.49M | -$2.99M | 51 | 2026-05-19 |
| KO | Director | 5,200 | $89.19 | $463.8K | $0 | 4 | 2026-04-03 |
| GHC | Director | 5,900 | $1234.68 | $7.28M | $365.3K | 6 | 2024-09-13 |
| CABO | Director | 29,120 | $41.60 | $1.21M | $18.48M | 26 | 2023-03-13 |
| Enovis CORP (CFXA) Delisted | Director | 65,060 | $177.71 | $11.56M | $0 | 15 | 2022-01-04 |
| Enovis CORP (CFX) Delisted | Director | 16,482 | $117.18 | $1.93M | $0 | 50 | 2019-01-03 |
| MARKEL GROUP INC. (MKV) Delisted | Pres. & Chief Investment Off. | 31,959 | — | — | $0 | 11 | 2011-12-05 |
Recent Filings · Page 2 of 17
163 filingsInsider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2024-04-03 | KO | Grant (A) | — | $0 | EDGAR |
| 2024-02-27 | MKL | Grant (A) | +1,041 | $0 | EDGAR |
| 2024-02-22 | MKL | Grant (A) | +2,710 | $0 | EDGAR |
| 2024-02-05 | MKL | Buy (P) | +100 | $141.5K | EDGAR |
| 2023-12-06 | MKL | Tax (F) | −46 | -$64.5K | EDGAR |
| 2023-11-09 | GHC | Buy (P) | +100 | $60.7K | EDGAR |
| 2023-11-06 | MKL | Buy (P) | +100 | $131.2K | EDGAR |
| 2023-09-12 | GHC | Buy (P) | +100 | $57.0K | EDGAR |
| 2023-08-07 | MKL | Buy (P) | +100 | $147.9K | EDGAR |
| 2023-07-21 | KO | Grant (A) | — | $0 | EDGAR |
Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.