As filed with the Securities and Exchange Commission on October 28, 2014

Registration No. 333-

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM S-1

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933

Shell Midstream Partners, L.P.

(Exact name of registrant as specified in its charter)

One Shell Plaza

910 Louisiana Street

Houston, Texas 77002

(713) 241-6161

(Address, including zip code, and telephone number, including area code, of registrant’s principal executive offices)

Lori M. Muratta

Vice President, General Counsel and Secretary

Shell Midstream Partners GP LLC

One Shell Plaza

910 Louisiana Street

Houston, Texas 77002

(713) 241-2973

(Name, address, including zip code, and telephone number, including area code, of agent for service)

Copies to:

Approximate date of commencement of proposed sale to the public: As soon as practicable after this Registration Statement becomes effective.

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933 check the following box.  ¨

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.  x File No. 333-196850

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.  ¨

If this Form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

CALCULATION OF REGISTRATION FEE

The Registration Statement shall become effective upon filing with the Securities and Exchange Commission in accordance with Rule 462(b) under the Securities Act of 1933, as amended.

EXPLANATORY NOTE

This registration statement is being filed with respect to the registration of additional common units representing limited partner interests of Shell Midstream Partners, L.P., a Delaware limited partnership, pursuant to Rule 462(b) under the Securities Act of 1933, as amended. The contents of the registration statement on Form S-1 (Registration No. 333-196850), initially filed by Shell Midstream Partners, L.P. with the Securities and Exchange Commission on June 18, 2014, as amended by Amendment No. 1 thereto filed on August 12, 2014, Amendment No. 2 thereto filed on September 23, 2014, Amendment No. 3 thereto filed on October 8, 2014 and Amendment No. 4 thereto filed on October 20, 2014, and which was declared effective on October 28, 2014, including the exhibits thereto, are incorporated herein by reference.

The required opinions and consents are listed on an Exhibit Index attached hereto and filed herewith.

PART II

INFORMATION NOT REQUIRED IN PROSPECTUS

The following documents are filed as exhibits to this registration statement:

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended, the registrant has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Houston, State of Texas, on October 28, 2014.

Pursuant to the requirements of the Securities Act of 1933, as amended, this Registration Statement has been signed by the following persons in the capacities and the dates indicated.

INDEX TO EXHIBIT