Sec Form 4 Filing - ALEXANDER PETER @ BMC STOCK HOLDINGS, INC. - 2017-04-04

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person ALEXANDER PETER 2. Issuer Name and Ticker or Trading Symbol BMC STOCK HOLDINGS, INC. [ BMCH] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) President & Chief Exec Officer (Last) (First) (Middle) C/O BMC STOCK HOLDINGS, INC., 980 HAMMOND DRIVE NE, SUITE 500 3. Date of Earliest Transaction (MM/DD/YY) 04/04/2017 (Street) ATLANTA, GA30328 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 71,095 I See Footnote ( 1 ) Common Stock 04/04/2017 S 5,491 D $ 23 371,545 I See Footnote ( 2 ) Common Stock 100,691 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other ALEXANDER PETER C/O BMC STOCK HOLDINGS, INC. 980 HAMMOND DRIVE NE, SUITE 500 ATLANTA, GA30328 X President & Chief Exec Officer Signatures /s/ Paul Street by power of attorney for Peter C. Alexander 04/06/2017 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Kinderoaks Family LLC ("Kinderoaks") is the beneficial owner of 71,095 shares of common stock in the Issuer. Mr. Alexander, who is a Manager of Kinderoaks, has shared voting and dispositive power of such reported securities. The Reporting Person expressly disclaims beneficial ownership of such securities, except to the extent of the Reporting Person's pecuniary interest therein. The filing of this statement shall not be deemed to be an admission that, for purposes of Section 16 of the Securities Exchange Act of 1934 or otherwise, the Reporting Person is the beneficial owner of such securities. ( 2 )The Peter C. Alexander Revocable Trust dated August 8, 2014 (the "Alexander Trust") is the beneficial owner of 371,545 shares of common stock in the Issuer. Mr. Alexander, who is a trustee of the Alexander Trust, has shared voting and dispositive power over such reported securities. The Reporting Person expressly disclaims beneficial ownership of such securities, except to the extent of the Reporting Person's pecuniary interest therein. The filing of this statement shall not be deemed to be an admission that, for purposes of Section 16 of the Securities Exchange Act of 1934 or otherwise, the Reporting Person is the beneficial owner of such securities

Remarks: The transaction reported in this Form 4 was effected pursuant to a Rule 10b5-1 Trading Plan adopted by the Reporting Person.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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