X0306 4 2019-05-07 0 0001316835 Builders FirstSource, Inc. BLDR 0001760672 Rush David E 2001 BRYAN ST., SUITE 1600 DALLAS TX 75201 0 1 0 0 SVP - COO - East Common Stock, par value $0.01 per share 2019-05-07 4 S 0 4000 16.42 D 45237 D Prior to filing this Form 4, the reporting person disgorged profits to the Issuer in the amount of $18,640 resulting from the purchase of 4,000 shares of Issuer common stock on December 10, 2018, and the sale of 4,000 shares of Issuer common stock on May 7, 2019, reported on this Form 4. /s/ Jeffrey A. Wier, by power of attorney 2019-05-16