Form 4: J. Michael Stice Reports 962.494-Unit Acquisition at $0

Rhea-AI Filing Summary

Director J. Michael Stice reported an acquisition of MPLX common units. On 08/15/2025 he acquired 962.494 common units at a reported price of $0, increasing his total beneficial ownership to 51,275.827 common units. The filing shows 700 units held indirectly by The Mike Stice Trust. The reporting person is a director of MPLX GP LLC, the issuer's general partner.

Positive

• Insider acquisition disclosed showing transparency about director ownership
• Total beneficial ownership disclosed at 51,275.827 common units, improving clarity for investors

Negative

• None.

Insights

Corporate Governance Expert

TL;DR: A director received 962.494 MPLX units at no cash cost, modestly increasing his stake.

The transaction is coded as an acquisition with a price of $0, which typically reflects a grant, distribution, or other non-cash award rather than an open-market purchase. The filing confirms the reporter's role as a director of MPLX GP LLC, the general partner that manages the issuer, which is relevant to insider reporting and governance transparency. The ownership level of 51,275.827 units is disclosed, with 700 held indirectly via a trust.

Securities Analyst

TL;DR: Insider received units; the amount is small relative to institutional holdings but noteworthy for disclosure.

The Form 4 documents a non‑market acquisition of 962.494 common units on 08/15/2025 at $0, reporting post-transaction beneficial ownership of 51,275.827 units. The filing was signed by an attorney-in-fact. This is a routine insider disclosure that updates ownership but contains no pricing or market-sale information to assess immediate market impact.

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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OMB Number:			3235-0287
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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)
08/15/2025

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)	08/15/2025		A		962.494	A	$0	51,275.827	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	08/19/2025
	** 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 did MPLX director J. Michael Stice report on Form 4?

He reported an acquisition of 962.494 common units of MPLX on 08/15/2025 at a reported price of $0, with total beneficial ownership now 51,275.827 units.

Does the Form 4 indicate indirect ownership for J. Michael Stice?

Yes. The filing shows 700 common units held indirectly by The Mike Stice Trust.

What does the reported price of $0 mean in this Form 4?

The form explicitly reports a price of $0 for the acquisition. The document does not provide further explanation of the price in this filing.

What is the reporting person’s relationship to MPLX?

The filing states he is a Director of MPLX GP LLC, the general partner that manages the issuer.

When was the Form 4 signed and by whom?

The signature block shows the form was signed on 08/19/2025 by Molly R. Benson, Attorney-in-Fact for J. Michael Stice.