X0306 4 2017-11-13 0 0001316835 Builders FirstSource, Inc. BLDR 0001326953 CROW M CHAD 2001 BRYAN STREET SUITE 1600 DALLAS TX 75201 1 1 0 0 President and COO Common Stock, par value $0.01 per share 2017-11-13 4 M 0 116769 7.67 A 446248 D Common Stock, par value $0.01 per share 2017-11-13 4 S 0 116769 18.27 D 329479 D Common Stock, par value $0.01 per share 2017-11-13 4 S 0 2960 18.17 D 326519 D Common Stock, par value $0.01 per share 2017-11-14 4 S 0 38655 18.16 D 287864 D Employee Stock Option (right to buy) 7.67 2017-11-13 4 M 0 116769 0.00 D 2024-02-11 Common Stock 116769 38923 D This transaction was executed in multiple trades at prices ranging from $17.95 to $18.63 per share. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide full information regarding the number of shares and prices at which the transactions were effected upon request by the SEC staff, the issuer, or a security holder of the issuer. This transaction was executed in multiple trades at prices ranging from $18.15 to $18.26 per share. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide full information regarding the number of shares and prices at which the transactions were effected upon request by the SEC staff, the issuer, or a security holder of the issuer. This transaction was executed in multiple trades at prices ranging from $17.83 to $18.42 per share. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide full information regarding the number of shares and prices at which the transactions were effected upon request by the SEC staff, the issuer, or a security holder of the issuer. Award issued under the Company's 2007 Incentive Plan, as amended and restated on January 14, 2010. The option was granted on February 11, 2014 and vests in 25% increments on each of February 11, 2015-2018. /s/ M. Chad Crow 2017-11-15