Insider Transaction Report for Builders FirstSource, Inc.

This filing details insider transactions for Matthew Trester, Principal Accounting Officer at Builders FirstSource, Inc. On March 15, 2026, Trester acquired 1419 restricted stock units (RSUs) under the 2014 Incentive Plan, which vest in increments from 2027-2029. Additionally, 698 performance-based RSUs vested on the same date. Trester also disposed of 648 shares to cover tax withholding obligations related to vesting, at a price of $88.09 per share. Following these transactions, Trester directly owns 4629 shares of common stock.