X0306 4 2022-09-01 0 0001316835 Builders FirstSource, Inc. BLDR 0001320940 Hayes William B C/O BUILDERS FIRSTSOURCE, INC. 2001 BRYAN ST., SUITE 1600 DALLAS TX 75201 1 0 0 0 Common Stock, par value $0.01 per share 2022-09-01 4 A 0 553 0.00 A 8035 D Common Stock, par value $0.01 per share 14593 I by Spousal Lifetime Access Trust Reflects the acquisition of restricted stock units pursuant to the Corporation's 2014 Incentive Plan. The restricted stock units vest on June 14, 2023 and entitle the reporting person to one share of common stock for each restricted stock unit that vests. /s/ Minator Azemi, by power of attorney 2022-09-06