[Form 4] MPLX LP Insider Trading Activity

Rhea-AI Filing Summary

MPLX LP (MPLX) reported an insider equity transaction by a director on Form 4. On 11/14/2025, the reporting person acquired 1,037.37 MPLX common units (limited partner interests) in a transaction reported with a price of $0 per unit, indicating a grant or similar award rather than an open-market purchase. Following this transaction, the reporting person beneficially owns 52,313.197 MPLX common units directly and 700 MPLX common units indirectly through The Mike Stice Trust. The reporting person serves as a director of MPLX GP LLC, the general partner that manages MPLX LP.

SEC Form 4

FORM 4

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

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

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

STICE J MICHAEL

(Last) (First) (Middle)

C/O MPLX LP

200 E. HARDIN STREET

(Street)

FINDLAY OH 45840

(City) (State) (Zip)

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
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
11/14/2025

4. 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 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)	11/14/2025		A		1,037.37	A	$0	52,313.197	D
Common Units (Limited Partner Interests)								700	I	The Mike Stice Trust

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 Securities Underlying Derivative Security (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: 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

Explanation of Responses:

Remarks:

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 J. Michael Stice	11/18/2025
	** 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 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).
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

What insider transaction did MPLX (MPLX) report on this Form 4?

The filing reports that a director acquired 1,037.37 MPLX common units (limited partner interests) on 11/14/2025, at a reported price of $0 per unit.

How many MPLX units does the reporting person own after the 11/14/2025 transaction?

After the reported transaction, the insider beneficially owns 52,313.197 MPLX common units directly and 700 MPLX common units indirectly through The Mike Stice Trust.

What is the relationship of the reporting person to MPLX (MPLX)?

The reporting person is a Director of MPLX GP LLC, which is the general partner of MPLX LP and manages the issuer through its directors and executive officers.

Was the MPLX insider transaction reported as an acquisition or a disposition?

The transaction involving 1,037.37 MPLX common units on 11/14/2025 is reported as an acquisition (A) of securities.

Does the filing show any derivative securities for the MPLX insider?

The section for derivative securities is present but contains no reported derivative positions acquired, disposed of, or beneficially owned in this filing.

How is indirect ownership in MPLX units held by the reporting person?

The filing shows 700 MPLX common units held indirectly through The Mike Stice Trust, in addition to the reporting person’s directly held units.