X0202 4 2005-12-12 0 0001316835 Builders FirstSource, Inc. BLDR 0001326952 HORN CHARLES L 2001 BRYAN STREET SUITE 1600 DALLAS TX 75201 0 1 0 0 SVP & Chief Financial Officer Common Stock, par value $0.01 per share 2005-12-12 4 M 0 15000 3.15 A 15000 D Common Stock, par value $0.01 per share 2005-12-12 4 M 0 10000 3.15 A 10000 D Common Stock, par value $0.01 per share 2005-12-12 4 M 0 7500 3.15 A 7500 D Common Stock, par value $0.01 per share 2005-12-12 4 S 0 35000 19.71 D 0 D Common Stock, par value $0.01 per share 2005-12-12 4 S 0 10000 19.70 D 0 D Employee Stock Option (right to buy) 3.15 2005-12-12 4 M 0 15000 D 2009-05-12 Common Stock 15000 0 D Employee Stock Option (right to buy) 3.15 2005-12-12 4 M 0 10000 D 2010-05-01 Common Stock 10000 0 D Employee Stock Option (right to buy) 3.15 2005-12-12 4 M 0 7500 D 2001-02-13 Common Stock 7500 2500 D Award issued under the Company's 1998 Stock Incentive Plan, as amended and restated March 1, 2004 100% is presently exercisable. Option vested in 33.3% increments on each of May 12, 2000-2002. Not Applicable. 100% is presently exercisable. Option vested in 20% increments on each of May 1, 2001-2005. 80% is presently exercisable. Option vests in 20% increments on each of February 13, 2002-2006. /s/ Charles L. Horn 2005-12-14