X0306 4 2018-08-01 0 0001316835 Builders FirstSource, Inc. BLDR 0001366433 Steinke Craig Arthur 2001 BRYAN STREET SUITE 1600 DALLAS TX 75201 1 0 0 0 Common Stock, par value $0.01 per share 2018-08-01 4 A 0 6810 0.00 A 183883 D Reflects the acquisition of restricted stock units pursuant to the Corporation's 2014 Incentive Plan. The restricted stock units vest on August 1, 2019 and entitle the reporting person to one share of common stock for each restricted stock unit that vests. /s/ Donald F. McAleenan, by power of attorney 2018-08-02