UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (date of earliest event reported): July 25, 2016

Shell Midstream Partners, L.P.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (713) 241-6161

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2):

Item 1.01 Entry into a Material Definitive Agreement.

Share Sale and Purchase Agreement

On July 25, 2016, Shell Midstream Partners, L.P. (the “Partnership”) entered into a Share Sale and Purchase Agreement (the “Purchase Agreement”) with Shell Pipeline Company LP (“SPLC”) and Shell Midstream Operating LLC (“Operating”), a wholly owned subsidiary of the Partnership, to acquire a 2.62% interest (the “Acquisition”) in Explorer Pipeline Company (“Explorer”). The Partnership expects to fund the Acquisition with cash on hand. The Acquisition is expected to close on or about August 25, 2016, subject to customary closing conditions and regulatory approvals.

The Purchase Agreement contains customary representations, warranties and covenants of SPLC, the Partnership and Operating. SPLC, on the one hand, and the Partnership and Operating, on the other hand, have agreed to indemnify each other and their respective affiliates, officers, directors and other representatives against certain losses resulting from any breach of their representations, warranties or covenants contained in the Purchase Agreement, subject to certain limitations.

As of July 25, 2016, SPLC’s wholly owned subsidiary, Shell Midstream LP Holdings LLC, owned 21,475,068 common units and 67,475,068 subordinated units in the Partnership, representing an aggregate 49.6% limited partner interest. SPLC also owned a 100% interest in Shell Midstream Partners GP LLC, the general partner (the “General Partner”) of the Partnership, which in turn owned 3,586,580 general partner units, representing a 2% general partner interest, and all of the incentive distribution rights in the Partnership. The terms of the Acquisition were approved by the board of directors of the General Partner.

The foregoing description is not complete and is qualified in its entirety by reference to the full text of the Purchase Agreement, which is filed as Exhibit 10.1 to this Current Report on Form 8-K and incorporated herein by reference.

Item 7.01 Regulation FD Disclosure.

On July 25, 2016, the Partnership issued a press release announcing the entry into the Purchase Agreement. A copy of the press release is attached as Exhibit 99.1 hereto and is incorporated herein by reference.

The information provided in this Item 7.01 (including the exhibits referenced therein) shall be deemed “furnished” and shall not be deemed “filed” for the purposes of Section 18 of the Exchange Act, nor shall it be incorporated by reference in any filing made by the Partnership pursuant to the Securities Act of 1933, except to the extent that such filing incorporates by reference any or all of such information by express reference thereto.

Item 9.01 Financial Statements and Exhibits.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: July 29, 2016

INDEX TO EXHIBITS