Sec Form 3 Filing - TTC Holdings LLC @ MPLX LP - 2021-01-01

FORM 3 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person TTC Holdings LLC 2. Issuer Name and Ticker or Trading Symbol MPLX LP [ MPLX] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 539 S. MAIN STREET 3. Date of Earliest Transaction (MM/DD/YY) 01/01/2021 (Street) FINDLAY, OH45840 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Units (Limited Partner Interests) 647,415,452 I See Footnotes ( 1 ) ( 2 ) ( 3 ) ( 4 ) TexNew Mex Units 80,000 I See Footnotes ( 1 ) ( 2 ) ( 3 ) ( 4 ) Special Limited Partner Interest 1 I See Footnotes ( 1 ) ( 2 ) ( 3 ) ( 4 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other TTC Holdings LLC 539 S. MAIN STREET FINDLAY, OH45840 X Signatures /s/ Molly R. Benson, Vice President and Secretary, TTC Holdings LLC 01/08/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )This Form 3 is submitted by TTC Holdings LLC ("TTC Holdings") which, effective as of January 1, 2021 (the "Effective Date"), and pursuant to the Reorganization Agreement, dated as of December 31, 2020 (the "Reorganization Agreement"), by and among TTC Holdings, Andeavor LLC, Western Refining, Inc. ("WRI"), Giant Industries, Inc. ("GII"), Western Refining Southwest, Inc. ("WRSI"), Tesoro Refining & Marketing Company LLC ("TRMC"), Tesoro Alaska Company LLC ("TAC"), Tesoro Logistics GP, LLC ("TLGP"), and the other signatories thereto, became a part of the reporting group which includes Marathon Petroleum Corporation ("MPC"), MPC Investment LLC ("MPC Investment"), MPLX GP LLC (the "General Partner"), MPLX Logistics Holdings LLC ("Logistics Holdings"), Andeavor LLC, WRI and GII. ( 2 )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. TTC Holdings is a wholly owned subsidiary WRI. GII is a wholly owned subsidiary of TTC Holdings. Accordingly, MPC Investment, the General Partner, Logistics Holdings, Andeavor LLC, WRI, TTC Holdings and GII are all direct or indirect wholly owned subsidiaries of MPC. ( 3 )The Reorganization Agreement sets forth a series of intercompany transactions pursuant to which, among other things: (i) TRMC and TAC distributed to WRSI all of the outstanding limited liability company interests in TLGP held by each of TRMC and TAC immediately prior to such distribution; (ii) TLGP distributed to WRSI all of the common units representing limited partner interests in the Issuer held by TLGP prior to such distribution; (iii) WRSI converted to a Delaware limited liability company under the name Western Refining Southwest LLC ("WRSWL"); (iv) WRSWL distributed to GII all of the (x) common units representing limited partner interests in the Issuer, (y) MPLX TexNew Mex units and (z) the MPLX Special Limited Partner Interest held, in each case, by WRSWL immediately prior to such distribution (collectively, the "MPLX Interests"); and (v) WRI contributed all of the outstanding capital stock of GII to TTC Holdings. ( 4 )TTC Holdings may be deemed to beneficially own the MPLX Interests owned by GII but disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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