Certain Stock Options of Builders FirstSource, Inc. are subject to a Lock-Up Agreement Ending on 18-JAN-2016. These Stock Options will be under lockup for 60 days starting from 19-NOV-2015 to 18-JAN-2016.

Details:
Warburg Pincus Private Equity IX, L.P. has agreed that it will not offer, sell, contract to sell, pledge or otherwise dispose of, directly or indirectly, any shares of common stock or any securities convertible into or exchangeable or exercisable for common stock, for a period of 60 days after the date of this prospectus supplement without the prior written consent of the Deutsche Bank Securities Inc.