X0202 4 2006-12-06 0 0001316835 Builders FirstSource, Inc. BLDR 0001314153 JLL PARTNERS FUND V LP 450 LEXINGTON AVE, SUITE 3350 NEW YORK NY 10017 0 0 1 0 0001353092 JLL Associates V, L.P. 450 LEXINGTON AVE, SUITE 3350 NEW YORK NY 10017 0 0 1 0 0001353091 JLL Associates G.P. V, L.L.C. 450 LEXINGTON AVE, SUITE 3350 NEW YORK NY 10017 0 0 1 0 Common Stock, par value $0.01 per share 2006-12-06 4 P 0 300000 18.60 A 8952551.5 I By Building Products, LLC The reporting persons disclaim beneficial ownership of these securities, and this report shall not be deemed an admission that any of the reporting persons is the beneficial owner of the securities for purposes of Section 16 or for any other purpose. JLL Partners Fund V, L.P., indirectly beneficially owns 8,952,551.5 shares of common stock, par value $0.01 per share, of Builders FirstSource, Inc. by virtue of its position as a member of Building Products, LLC, and pursuant to the Amended and Restated Limited Liability Company Agreement of Building Products, LLC. JLL Associates V, L.P., is the general partner of JLL Partners Fund V, L.P. JLL Associates G.P. V, L.L.C. is the general partner of JLL Associates V, L.P. JLL Partners Fund V, L.P. By JLL Associates V, L.P. its general partner By JLL Associates G.P. V, L.L.C., its general partner /s/ Paul S. Levy, Managing Member of JLL Associates G.P. V, L.L.C. 2006-12-07 By JLL Associates G.P. V, L.L.C., its general partner /s/ Paul S. Levy, Managing Member of JLL Associates G.P. V, L.L.C. 2006-12-07 /s/ Paul S. Levy, Managing Member of JLL Associates G.P. V, L.L.C. 2006-12-07