X0306 4 2017-03-08 0 0001316835 Builders FirstSource, Inc. BLDR 0001494923 JLL Building Holdings, LLC C/O JLL PARTNERS, INC. 450 LEXINGTON AVENUE, 31ST FLOOR NEW YORK NY 10017 0 0 1 0 0001314153 JLL PARTNERS FUND V LP 450 LEXINGTON AVE, 31ST FLOOR 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 2017-03-08 4 S 0 10000000 14.51 D 14344584 I See footnote This report is filed jointly by JLL Building Holdings, LLC ("JLL Holdings"); JLL Partners Fund V, L.P., the sole member of JLL Holdings; JLL Associates V, L.P., the general partner of JLL Fund V, L.P.; and JLL Associates G.P. V, L.L.C., the general partner of JLL Associates V, L.P. (the "Reporting Persons"). JLL Holdings is the direct owner of 14,344,584 shares of common stock, par value $0.01 per share, of Builders FirstSource, Inc. By reason of the provisions of Rule 16a-1 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), JLL Partners Fund V, L.P., JLL Associates V, L.P., and JLL Associates G.P. V, L.L.C. may be deemed to be the beneficial owners of any securities that may be beneficially owned by JLL Holdings. However, the foregoing Reporting Persons disclaim beneficial ownership of these securities, except to the extent of any pecuniary interest therein. JLL Building Holdings, LLC, JLL Partners Fund V, L.P., JLL Associates V, L.P., JLL Associates G.P. V, L.L.C. /s/ Daniel Agroskin, Authorized Signatory of JLL Associates G.P. V, L.L.C. 2017-03-10 JLL Partners Fund V, L.P., JLL Associates V, L.P., JLL Associates G.P. V, L.L.C. /s/ Daniel Agroskin, Authorized Signatory of JLL Associates G.P. V, L.L.C. 2017-03-10 JLL Associates V, L.P., JLL Associates G.P. V, L.L.C. /s/ Daniel Agroskin, Authorized Signatory of JLL Associates G.P. V, L.L.C. 2017-03-10 JLL Associates G.P. V, L.L.C. /s/ Daniel Agroskin, Authorized Signatory 2017-03-10