RRMS Rose Rock Midstream, L.P. Common Units Representing Limited Partner Interests

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D/A

Under the Securities Exchange Act of 1934

(Amendment No. 6)

Rose Rock Midstream, L.P.

(Name of Issuer)

Common units representing limited partner interests

(Title of Class of Securities)

777149105

(CUSIP Number)

William H. Gault

Secretary

Two Warren Place

6120 S. Yale Avenue, Suite 700

Tulsa, OK 74136-4216

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

September 30, 2016

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.   ¨

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See Rule 13d-7 for other parties to whom copies are to be sent.

The information required on 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).

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The following constitutes Amendment No. 6 (“ Amendment No. 6 ”) to the original Schedule 13D filed by the undersigned on January 17, 2012, as amended by Amendment No. 1 thereto filed by the undersigned on January 22, 2013, as further amended by Amendment No. 2 thereto filed by the undersigned on January 10, 2014, as further amended by Amendment No. 3 thereto filed by the undersigned on July 3, 2014, as further amended by Amendment No. 4 thereto filed by the undersigned on April 1, 2015, and as further amended by Amendment No. 5 thereto filed by the undersigned on May 31, 2016 (as amended, the “ Original 13D ”). This Amendment No. 6 amends the Original 13D as specifically set forth herein. This Schedule 13D relates to common units (“ Common Units ”) representing limited partner interests in Rose Rock Midstream, L.P. (the “ Issuer ” or “ RRMS ”). The Issuer is a Delaware limited partnership with its principal executive offices located at Two Warren Place, 6120 S. Yale, Suite 700, Tulsa, Oklahoma 74136-4216.

Item 2 of the Original 13D is hereby amended and restated as below:

(a)(b)(c) This Amendment No. 6 is filed jointly by the following persons (collectively, the “ Reporting Persons ”):

Holdings is a direct, wholly-owned subsidiary of SemGroup. RRMC is a direct, wholly-owned subsidiary of Holdings. SemGroup is a New York Stock Exchange (“ NYSE ”) listed company, whose common stock trades on the NYSE under the symbol “SEMG”.

The principal business and office address of each of the Reporting Persons is Two Warren Place, 6120 S. Yale Avenue, Suite 700, Tulsa, OK 74136-4216.

(d) During the last five years, none of the Reporting Persons has been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors).

(e) During the last five years, none of the Reporting Persons were a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

(f) Not applicable.

On September 30, 2016, the executive officers, directors and each person controlling the Reporting Persons, as applicable (collectively, the “ Covered Persons ”), ceased to beneficially own any Common Units of the Issuer. To the Reporting Persons’ knowledge, none of the Covered Persons has been, during the last five years, (i) convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors), or (ii) a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

Item 3 of the Original 13D is hereby amended to add the following:

The information provided in Item 4 below is incorporated by reference into this Item 3.

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Item 4 of the Original 13D is hereby amended to add the following:

On September 30, 2016, SemGroup completed its previously announced merger with PBMS, LLC (“ Merger Sub ”), a Delaware limited liability company, pursuant to that certain Agreement and Plan of Merger (the “ Merger Agreement ”), dated May 30, 2016, by and among SemGroup, Merger Sub, RRMS and Rose Rock Midstream GP, LLC (“ RRMS General Partner ”), pursuant to which Merger Sub merged with and into RRMS with RRMS being the surviving entity in the merger (the “ Merger ”). Upon consummation of the Merger, SemGroup indirectly acquired all of the outstanding Common Units that SemGroup and its subsidiaries did not already own. On September 30, 2016, following the consummation of the Merger, SemGroup and certain of its subsidiaries commenced a series of transactions, including (i) the merger of RRMS with and into SemGroup, (ii) the merger of Rose Rock Midstream Holdings, LLC (“ Holdings ”) with and into SemGroup and (iii) the merger of Rose Rock Midstream Corporation (“ RRMC ”) with and into Holdings, (each a “ Clean-up Merger ” and, together, the “ Clean-up Mergers ”), with SemGroup, in the instance of clauses (i) and (ii), continuing as the surviving entity. Upon the completion of the Clean-up Mergers, each of Holdings, RRMC and RRMS ceased to exist as separate legal entities.

Item 5 of the Original 13D is hereby amended and restated as below:

Percentage: 0.0%

(i) Sole power to vote or direct the vote: 0

(ii) Shared power to vote or direct the vote: 0

(iii) Sole power to dispose or to direct the disposition of: 0

(iv) Shared power to dispose or to direct the disposition of: 0

Item 6 of the Original 13D is hereby amended to add the following:

The information contained in Item 4 of this Amendment No. 6 is incorporated herein by reference.

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SIGNATURES

After reasonable inquiry and to the best of our knowledge and belief, the undersigned certify that the information set forth in this statement is true, complete and correct.

Dated: September 30, 2016

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