X0306 4 2020-06-17 0 0001316835 Builders FirstSource, Inc. BLDR 0001326908 MILGRIM BRETT N 2001 BRYAN ST. SUITE 1600 DALLAS TX 75201 1 0 0 0 Common Stock, par value $0.01 per share 2020-06-17 4 A 0 5840 0.00 A 62786 D Reflects the acquisition of restricted stock units pursuant to the Corporation's 2014 Incentive Plan. The restricted stock units vest on June 17, 2021 and entitle the reporting person to one share of common stock for each restricted stock unit that vests. /s/ Jeffrey A. Wier by power of attorney 2020-06-18