What Mason Hawkins bought and sold in Q1 2025

In Q1 2025, Mason Hawkins (Southeastern Asset Management) opened 3 new positions — including REGN (3.9%), TRIP (1.3%), SHEN (0.6%), trimmed 3, exited 3 (RTX, LLYVK*, LLYVA*). The book stood at $1.88B across 43 positions, filed May 15, 2025.

Changes vs the prior quarter's 13F, long US equity positions only (no shorts, options, or non-US listings). ADD/TRIM are share- count changes of ±20% or more. Sourced from SEC EDGAR. Not investment advice.