X0306 4 2019-05-22 0 0001316835 Builders FirstSource, Inc. BLDR 0001239309 BARR DAVID 2001 BRYAN ST., SUITE 1600 DALLAS TX 75201 1 0 0 0 Common Stock, par value $0.01 per share 2019-05-22 4 A 0 6748 0.00 A 90849 D Reflects the acquisition of restricted stock units pursuant to the Corporation's 2014 Incentive Plan. The restricted stock units vest on May 22, 2020 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 2019-05-24