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Section 1: 3 (FORM 3 SUBMISSION)

Ownership Submission
FORM 3
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF 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 *
  Goff Gregory James
2. Date of Event Requiring Statement (Month/Day/Year)
10/01/2018
3. Issuer Name and Ticker or Trading Symbol
MPLX LP [MPLX]
(Last)
(First)
(Middle)
C/O MPLX LP, 200 E. HARDIN STREET
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
5. If Amendment, Date Original Filed (Month/Day/Year)
(Street)

FINDLAY, OH 45840
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 Beneficially Owned
1.Title of Security
(Instr. 4)
2. Amount of Securities Beneficially Owned
(Instr. 4)
3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)
4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Units (Limited Partner Interests) 11,726.763
D
 

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)
2. Date Exercisable and Expiration Date
(Month/Day/Year)
3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)
4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)
6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Goff Gregory James
C/O MPLX LP
200 E. HARDIN STREET
FINDLAY, OH 45840
  X      

Signatures

/s/ Molly R. Benson, Attorney-in-Fact for Gregory James Goff 10/01/2018
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(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).
 
Remarks:
Exhibit List:  Exhibit 24 Power of AttorneyThe Reporting Person is a Director 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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Section 2: EX-24.3_811317 (POA DOCUMENT)


EXHIBIT 24

MPLX LP POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints Molly R. Benson, Jodi E. Baker, Shane T. Pfleiderer, Elisa D. Watts and
Joel M. Williams (the "Attorneys"), and each of them, as the true and lawful
attorney or attorneys-in-fact, with full power of substitution and revocation,
for the undersigned and in the name, place and stead of the undersigned, in any
and all capacities, to execute, on behalf of the undersigned, (1) any and all
notices pursuant to Rule 144 under the Securities Act of 1933 with respect to
sales of common units or other securities of MPLX LP, including, without
limitation, all notices of proposed sale on Form 144, and (2) any and all
statements or reports under Section 16 of the Securities Exchange Act of 1934
with respect to the beneficial ownership of common units or other securities of
MPLX LP, including, without limitation, all initial statements of beneficial
ownership on Form 3, all statements of changes in beneficial ownership on Form
4, all annual statements of beneficial ownership on Form 5 and all successor or
similar forms, to be filed with the Securities and Exchange Commission, to
execute any and all amendments or supplements to any such notices, statements or
reports, and to file the same, with all exhibits thereto, and other documents in
connection therewith, with the Securities and Exchange Commission, granting to
said Attorney or Attorneys-in-fact, and each of them, full power and authority
to do so and perform each and every act and thing requisite and necessary to be
done in and about the premises (including, without limitation, completing,
executing, delivering and filing a Form ID to apply for electronic filing
codes), as fully and to all intents and purposes as the undersigned might or
could do in person, and hereby ratifying and confirming all that said Attorney
or Attorneys-in-fact, or any of them, or their substitute or substitutes, may
lawfully do or cause to be done by virtue hereof.  The undersigned acknowledges
that the foregoing Attorneys-in-fact, and each of them, in serving in such
capacity at the request of the undersigned, are not assuming any of the
responsibilities of the undersigned to comply with Section 16 of the Securities
Exchange Act of 1934 or any other legal requirement.  This Power of Attorney
shall remain in effect until revoked in writing by the undersigned.




/s/ Gregory J. Goff
Gregory J. Goff



Date:  9/19/2018
 

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