UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Act of 1934

Date of Report (Date of Earliest Event Reported):

January 27, 2016 (January 26, 2016)

Commission file number: 001-35653

SUNOCO LP

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (832) 234-3600

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:

Item 7.01. Regulation FD Disclosure.

On January 26, 2016, Sunoco LP (the “Partnership”) issued a press release announcing that the board of directors of its general partner, Sunoco GP LLC, approved a cash distribution increase to $0.8013 per common unit ($3.2052 annualized) on Partnership common units for the quarter ended December 31, 2015.

A copy of the press release is set forth in Exhibit 99.1 and is incorporated herein by reference. In accordance with General Instruction B.2 of Form 8-K, the information set forth in the attached Exhibit 99.1 is deemed to be “furnished” and shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”).

Item 8.01. Other Events.

On January 26, 2016, the Partnership announced that the board of directors of its general partner, Sunoco GP LLC, approved a quarterly cash distribution of $0.8013 per common unit ($3.2052 annualized) on Partnership common units for the quarter ended December 31, 2015. The cash distribution will be paid on February 16, 2016 to unitholders of record as of the close of business on February 5, 2016.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits.

In accordance with General Instruction B.2 of Form 8-K, the information set forth in the attached Exhibit 99.1 is deemed to be “furnished” and shall not be deemed to be “filed” for purposes of Section 18 of the Exchange Act.

SIGNATURES

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.