MPLX (MPLX) director Ray Walker reports zero common units owned

Rhea-AI Filing Summary

MPLX LP director files initial ownership report showing no units held. Ray N. Walker Jr., a director of MPLX GP LLC, the general partner that manages MPLX LP, filed an initial insider ownership statement as of August 25, 2025. The filing reports beneficial ownership of 0 common units of MPLX LP, held directly. This is a routine regulatory disclosure of insider holdings and does not describe any purchase or sale transaction.

SEC Form 3

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
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Walker Ray N JR

(Last) (First) (Middle)

C/O MPLX LP

200 E. HARDIN STREET

(Street)

FINDLAY OH 45840

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
08/25/2025

3. Issuer Name and Ticker or Trading Symbol
MPLX LP [ MPLX ]

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 of 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

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)	0	D

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: 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

Explanation of Responses:

Remarks:

Exhibit List: Exhibit 24 Power of Attorney; The 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.

	/s/ Molly R. Benson, Attorney-in-Fact for Ray N. Walker Jr.	08/26/2025
	** Signature of Reporting Person	Date
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 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

Who is the insider reporting holdings in MPLX (MPLX) in this filing?

The insider is Ray N. Walker Jr., who serves as a director of MPLX GP LLC, the general partner that manages MPLX LP.

What does this insider filing say about Ray N. Walker Jr.'s ownership in MPLX (MPLX)?

The filing reports that Ray N. Walker Jr. beneficially owns 0 common units of MPLX LP, held directly, as of the reported date.

Does this MPLX (MPLX) insider filing show any stock transaction?

No. The disclosure is an initial statement of beneficial ownership and does not report any purchase or sale of MPLX LP units.

What type of security is reported in this MPLX (MPLX) insider filing?

The filing covers Common Units (Limited Partner Interests) of MPLX LP, with a reported beneficial ownership of zero units.

Is this insider filing for a director or a 10% owner of MPLX (MPLX)?

The reporting person is identified as a director of MPLX GP LLC and is not indicated as a 10% owner of MPLX LP.