Form 4 Filing for Builders FirstSource, Inc.

This filing reports a transaction by CHRISTOPHE CLEVELAND A, a director at Builders FirstSource, Inc. On September 10, 2026, 564 shares of Common Stock were acquired at a price of $0.00 per share. This acquisition was part of a compensation package for services rendered as a director, as per the Corporation's 2026 Incentive Plan and Amended and Restated Director Compensation Policy. Following this transaction, the total post-transaction shares owned by CHRISTOPHE CLEVELAND A amount to 38,762. The filing also includes a signature date of September 14, 2026, from Alena Brenner, acting by power of attorney.