Certain Common Stock of BMC Stock Holdings, Inc. are subject to a Lock-Up Agreement Ending on 11-JAN-2017. These Common Stock will be under lockup for 30 days starting from 12-DEC-2016 to 11-JAN-2017. Details: The officers, directors and the selling stockholders have agreed they will not to offer, sell, assign, transfer, pledge, contract to sell, or otherwise dispose of or announce the intention to otherwise dispose of, or enter into any swap, hedge any common stock or securities convertible into or exchangeable or exercisable for any common stock without the prior written consent of Goldman, Sachs & Co., for a period of 30 days after the date of the underwriting agreement.