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Section 1: 4 (FORM 4 SUBMISSION)

Ownership Submission
FORM 4
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 OF SECURITIES

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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(Print or Type Responses)
1. Name and Address of Reporting Person *
Heminger Gary R.
  2. Issuer Name and Ticker or Trading Symbol
MPLX LP [MPLX]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Chairman, CEO
(Last)
(First)
(Middle)
C/O MPLX LP, 200 E. HARDIN STREET
3. Date of Earliest Transaction (Month/Day/Year)
10/01/2018
(Street)

FINDLAY, OH 45840
4. If Amendment, Date Original Filed (Month/Day/Year)
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 (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 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) 10/01/2018   F   6,061 D $35.24 190,438 D  
Common Units (Limited Partner Interests) 10/01/2018   F   9,227 D $35.24 181,211 D  
Common Units (Limited Partner Interests) 10/01/2018   F   16,968 D $35.24 164,243 D  
Common Units (Limited Partner Interests)               26,750 I By Revocable Trust(1)
Common Units (Limited Partner Interests)               1,576.612(2)(3)(4) I As UTMA custodian for minor grandchild 1
Common Units (Limited Partner Interests)               1,576.612(2)(3)(4) I As UTMA custodian for minor grandchild 2
Common Units (Limited Partner Interests)               1,576.612(2)(3)(4) I As UTMA custodian for minor grandchild 3
Common Units (Limited Partner Interests)               1,576.612(2)(3)(4) I As UTMA custodian for minor grandchild 4
Common Units (Limited Partner Interests)               1,576.612(2)(3)(4) I As UTMA custodian for minor grandchild 5
Common Units (Limited Partner Interests)               1,500(2)(3) I As UTMA custodian for minor grandchild 6

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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 (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 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
(Month/Day/Year)
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
Heminger Gary R.
C/O MPLX LP
200 E. HARDIN STREET
FINDLAY, OH 45840
  X     Chairman, CEO  

Signatures

 /s/ Molly R. Benson, Attorney-in-Fact for Gary R. Heminger   10/03/2018
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) By Gary R. Heminger Revocable Trust.
(2) The reporting person disclaims beneficial ownership of these units, and this report shall not be deemed an admission that the reporting person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.
(3) The units are held in UTMA accounts for the benefit of Mr. Heminger's minor grandchildren. Mr. Heminger is the custodian and maintains investment control over the accounts.
(4) Total includes 76.612 units resulting from automatic distribution reinvestment pursuant to the terms of a UTMA account.
 
Remarks:
The Reporting Person is the Chairman of the Board of Directors and the Chief Executive Officer of MPLX GP LLC, the general partner of the Issuer. The Issuer is managed by the directors and executive officers of MPLX GP LLC.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

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