UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Schedule 13G/A

Information to be Included in Statements Filed Pursuant to Rules 13d-1(b), (c) and (d) and

Amendments Thereto Filed Pursuant to Rule 13d-2(b)

Under the Securities Exchange Act of 1934

(Amendment No. 3)*

BMC Stock Holdings, Inc.

(Name of Issuer)

Common Stock, $0.01 par value

(Title of Class of Securities)

05591B109

(CUSIP Number)

December 31, 2016

(Date of Event which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

☐ Rule 13d-1(b)

☐ Rule 13d-1(c)

☒ Rule 13d-1(d)

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

BMC Stock Holdings, Inc.

Two Lakeside Commons, 980 Hammond Drive, NE, Suite 500, Atlanta, GA 30328.

This Schedule 13G is being filed by The Gores Group, LLC, Gores Capital Partners II, L.P., Gores Capital Advisors II, LLC, Gores Building Holdings, LLC, Glendon Saturn Holdings, LLC, Fernando Goni, Alec E. Gores, Mark R. Stone, Vance W. Diggins and Steven C. Yager (individually a “Reporting Person” and collectively the “Reporting Persons”).

The Reporting Persons have entered into a Joint Filing Agreement, a copy of which is filed with this Schedule 13G as Exhibit 1 and is incorporated herein by reference. Pursuant to the Joint Filing Agreement, the Reporting Persons have agreed to file this Schedule 13G jointly in accordance with the provisions of Rule 13d-1(k)(1) under the Securities Act of 1933, as amended. The execution and filing of the Joint Filing Agreement shall not be construed as an admission that the Reporting Persons are a group or have agreed to act as a group.

The address of the principal business office of each of the Reporting Persons is c/o The Gores Group, LLC, 9800 Wilshire Blvd., Beverly Hills, California 90212.

Each of The Gores Group, LLC, Gores Capital Advisors II, LLC, Gores Building Holdings, LLC and Glendon Saturn Holdings, LLC is a limited liability company organized under the laws of the State of Delaware. Gores Capital Partners II, L.P. is a limited partnership organized under the laws of the State of Delaware. Each of Alec E. Gores, Mark R. Stone, Vance W. Diggins and Steven C. Yager is a citizen of the United States. Fernando Goni is a dual citizen of France and Argentina.

Common stock, par value $0.01 per share (the “Common Stock”)

05591B109

Gores Building Holdings, LLC is the record owner of 7,100,275 shares of Common Stock. Glendon Saturn Holdings, LLC is the record owner of 331,342 shares of Common Stock.

The Gores Group, LLC is the manager of Glendon Saturn Holdings, LLC and Alec E. Gores is the manager of The Gores Group, LLC. Gores Capital Partners II, L.P. is the controlling member of Gores Building Holdings, LLC. Gores Capital Advisors II, LLC is the general partner of Gores Capital Partners II, L.P. The Gores Group, LLC is the manager of Gores Capital Advisors II, LLC. The Gores Group, LLC has a five member investment committee that has voting and dispositive authority over the Common Stock held of record by Gores Building Holdings, LLC and Glendon Saturn Holdings, LLC. The members of the investment committee are Fernando Goni, Alec E. Gores, Mark R. Stone, Vance W. Diggins and Steven C. Yager. Each of the foregoing persons may be deemed to share voting and dispositive power with respect to the shares held of record by Gores Building Holdings, LLC and Glendon Saturn Holdings, LLC. None of the members of the investment committee, acting alone, has voting or dispositive power over any shares of Common Stock.

Each of the Reporting Persons expressly disclaims beneficial ownership of any shares of BMC Stock Holdings, Inc., except for Gores Building Holdings, LLC and Glendon Saturn Holdings, LLC, for the shares which they hold of record as provided in the prior paragraph.

The Gores Group, LLC: 11.2%

Gores Capital Partners II, L.P.: 10.7%

Gores Capital Advisors II, LLC: 10.7%

Gores Building Holdings, LLC: 10.7%

Glendon Saturn Holdings, LLC: 0.5%

Fernando Goni: 11.2%

Alec E. Gores: 11.2%

Mark R. Stone: 11.2%

Vance W. Diggins: 11.2%

Steven C. Yager: 11.2%

These percentages are calculated using the 66,621,753 shares of Common Stock outstanding as of December 8, 2016 as disclosed in the issuer’s Rule 424(b) prospectus filed with the Securities and Exchange Commission on December 14, 2016.

0 shares for each Reporting Person

The Gores Group, LLC: 7,431,617 shares

Gores Capital Partners II, L.P.: 7,100,275 shares

Gores Capital Advisors II, LLC: 7,100,275 shares

Gores Building Holdings, LLC: 7,100,275 shares

Glendon Saturn Holdings, LLC: 331,342 shares

Fernando Goni: 7,431,617 shares

Alec E. Gores: 7,431,617 shares

Mark R. Stone: 7,431,617 shares

Vance W. Diggins: 7,431,617 shares

Steven C. Yager: 7,431,617 shares

0 shares for each reporting person

The Gores Group, LLC: 7,431,617 shares

Gores Capital Partners II, L.P.: 7,100,275 shares

Gores Capital Advisors II, LLC: 7,100,275 shares

Gores Building Holdings, LLC: 7,100,275 shares

Glendon Saturn Holdings, LLC: 331,342 shares

Fernando Goni: 7,431,617 shares

Alec E. Gores: 7,431,617 shares

Mark R. Stone: 7,431,617 shares

Vance W. Diggins: 7,431,617 shares

Steven C. Yager: 7,431,617 shares

Not Applicable.

Not applicable.

Not Applicable.

Not Applicable.

Not Applicable.

Not applicable. This statement on Schedule 13G is not filed pursuant to Rule 13d-1(b) or Rule 13d-1(c).

SIGNATURE

After reasonable inquiry and to the best of our knowledge and belief, we certify that the information set forth in this statement is true, complete and correct. We also hereby agree to file this statement jointly pursuant to the Agreement listed on Exhibit 1 hereto.

Dated: February 8, 2017.

EXHIBIT INDEX

Exhibit 1

JOINT FILING AGREEMENT

In accordance with the requirements of Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, and subject to the limitations set forth therein, the parties set forth below agree to jointly file the Schedule 13G to which this joint filing agreement is attached, and have duly executed this joint filing agreement as of the date set forth below.

This agreement may be executed in any number of counterparts, each of which shall be deemed an original.

EXECUTED this 8th day of February, 2017.

Exhibit 2

POWER OF ATTORNEY

KNOW ALL BY THESE PRESENTS, that the undersigned hereby makes, constitutes and appoints Eric R. Hattler, signing singly, the undersigned’s true and lawful attorney-in-fact to:

The undersigned hereby grants to such attorney-in-fact full power and authority to do and perform any and every act and thing whatsoever requisite, necessary, or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do if personally present, with full power of substitution or revocation, hereby ratifying and confirming all that such attorney-in-fact’s substitute or substitutes, shall lawfully do or cause to be done by virtue of this power of attorney and the rights and powers herein granted. The undersigned acknowledges that the foregoing attorney-in-fact, in serving in such capacity at the request of the undersigned, are not assuming, nor is the Company assuming, any of the undersigned’s responsibilities to comply with Section 13 and Section 16 of the Exchange Act.

This Power of Attorney shall remain in full force and effect until the undersigned is no longer required to file reports or schedules under Section 13 or Section 16 of the Exchange Act with respect to the undersigned’s holdings of and transactions in securities issued by the Company, unless earlier revoked by the undersigned in a signed writing delivered to the foregoing attorney-in-fact.

*  *  *  *  *

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 17^th day of August, 2016.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 17^th day of August, 2016.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 17^th day of August, 2016.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 17^th day of August, 2016.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 17^th day of August, 2016.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 17^th day of August, 2016.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 17^th day of August, 2016.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 17^th day of August, 2016.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 17^th day of August, 2016.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 17^th day of August, 2016.