X0206 3 2019-07-30 0 0001552000 MPLX LP MPLX 0000050104 ANDEAVOR LLC 539 SOUTH MAIN STREET FINDLAY OH 45840-3229 0 0 1 0 0000912517 Western Refining Southwest, Inc. 539 S. MAIN ST. FINDLAY OH 45840 0 0 1 0 0001517724 Tesoro Logistics GP, LLC 539 S. MAIN ST. FINDLAY OH 45840 0 0 0 1 Less than 10% owner 0001339048 Western Refining, Inc. 539 SOUTH MAIN STREET FINDLAY OH 45840-3229 0 0 1 0 0000856465 Giant Industries, Inc. 539 SOUTH MAIN STREET FINDLAY OH 45840-3229 0 0 1 0 0001144853 TESORO REFINING & MARKETING Co LLC 539 SOUTH MAIN STREET FINDLAY OH 45840-3229 0 0 0 1 Less than 10% owner 0000911614 Tesoro Alaska Co LLC 539 SOUTH MAIN STREET FINDLAY OH 45840-3229 0 0 0 1 Less than 10% owner Common Units (Limited Partner Interests) 504701934 I See Footnotes This Form 3 is submitted jointly by Andeavor LLC (as successor by merger to Andeavor), Western Refining, Inc. ("WRI"), Giant Industries, Inc. ("GII"), Western Refining Southwest, Inc. ("WRSI"), Tesoro Refining & Marketing Company LLC ("TRMC"), Tesoro Alaska Company LLC ("TAC"), and Tesoro Logistics GP, LLC ("TLGP") which, effective as of July 30, 2019, and pursuant to the Agreement and Plan of Merger, dated as of May 7, 2019, by and among the Issuer, Andeavor Logistics LP, TLGP, MPLX GP LLC (the "General Partner") and MPLX MAX LLC, became a part of the reporting group which includes Marathon Petroleum Corporation ("MPC"), MPC Investment LLC ("MPC Investment"), the General Partner, and MPLX Logistics Holdings LLC ("Logistics Holdings"). MPC Investment, a direct wholly-owned subsidiary of MPC, owns all of the membership interests in the General Partner and Logistics Holdings. Andeavor LLC is a wholly owned subsidiary of MPC. WRI is a wholly owned subsidiary of Andeavor LLC. GII is a wholly owned subsidiary of WRI. WRSI is a wholly owned subsidiary of GII. TRMC and TAC are wholly owned subsidiaries of WRSI. All of the membership interests in TLGP are held by TRMC, TAC, and WRSI. Accordingly, MPC Investment, the General Partner, Logistics Holdings, Andeavor LLC, WRI, GII, WRSI, TRMC, TAC and TLGP are all direct or indirect wholly owned subsidiaries of MPC. /s/ Molly R. Benson, Vice President and Secretary, Andeavor LLC 2019-08-01 /s/ Molly R. Benson, Vice President and Secretary, Western Refining Southwest, Inc. 2019-08-01 /s/ Molly R. Benson, Vice President, Chief Securities, Governance & Compliance Officer and Corporate Secretary, Tesoro Logistics GP, LLC 2019-08-01 /s/ Molly R. Benson, Vice President and Secretary, Western Refining, Inc. 2019-08-01 /s/ Molly R. Benson, Vice President and Secretary, Giant Industries, Inc. 2019-08-01 /s/ Molly R. Benson, Vice President and Secretary, Tesoro Refining & Marketing Company LLC 2019-08-01 /s/ Molly R. Benson, Vice President and Secretary, Tesoro Alaska Company LLC 2019-08-01