Form 4 Filing: Michael Hiller Sells 900 Shares of Builders FirstSource, Inc. Common Stock

Michael Hiller, COO-Designate of Builders FirstSource, Inc., reported a disposition of 900 shares of common stock on June 4, 2026. The transaction, coded as a gift (G) with a price of $0.00 per share, resulted in a decrease of 900 shares. Following this transaction, Mr. Hiller now owns 52,142 shares of the company's common stock. The filing indicates this disposition was a gift of common stock to a charitable organization, as noted in footnote F1. The transaction was electronically signed on June 8, 2026.