Tom Gayner runs Markel Group, a conglomerate overseeing $12.54B in disclosed equity holdings (SEC CIK 0001096343). The latest 13F filing (2025Q4) discloses 128 positions across 10 sectors, with the largest positions in GOOG, BRK.A and BRK.B. On a mark-to-market basis the tracked portfolio has returned 14.3% over the past year. OpenStocks tracks 40 consecutive 13F filings for this manager — every position change, new entry, and exit is logged below.