X0306 4 2017-03-13 0 0001574815 BMC STOCK HOLDINGS, INC. BMCH 0001451488 Rea Jeffrey Gene C/O BMC STOCK HOLDINGS, INC. 980 HAMMOND DR NE, SUITE 500 ATLANTA GA 30328 1 0 0 0 Common Stock 2017-03-13 4 S 0 30000 21.8673 D 665360 D Common Stock 2017-03-14 4 S 0 30000 21.2813 D 635360 D The price reported in Column 4 is a weighted average price. These shares of Common Stock were disposed of in multiple transactions at prices ranging from $21.65 and $21.975, inclusive. The Reporting Person undertakes to provide upon request by the Commission staff, the Issuer, or a security holder of the Issuer full information regarding the number of shares of Common Stock sold at each separate price. The price reported in Column 4 is a weighted average price. These shares of Common Stock were disposed of in multiple transactions at prices ranging from $21.025 and $21.525, inclusive. The Reporting Person undertakes to provide upon request by the Commission staff, the Issuer, or a security holder of the Issuer full information regarding the number of shares of Common Stock sold at each separate price. The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 Trading Plan adopted by the Reporting Person. By: /s/ Paul Street, Attorney-in-Fact for Jeffrey G. Rea 2017-03-15