X0407 4 2023-06-14 0 0001316835 Builders FirstSource, Inc. BLDR 0001366433 Steinke Craig Arthur C/O BUILDERS FIRSTSOURCE, INC. 6031 CONNECTION DR., STE. 400 IRVING TX 75039 1 0 0 0 0 Common Stock, par value $0.01 per share 2023-06-14 4 A 0 1446 0.00 A 123230 D Reflects the acquisition of restricted stock units pursuant to the Corporation's 2014 Incentive Plan. The restricted stock units vest on June 14, 2024 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 2023-06-16