MPLX LP (MPLX) Senior VP reports 245-unit disposition at $54.85

Rhea-AI Filing Summary

MPLX LP reported an insider transaction by Senior Vice President, Logistics and Storage, Shawn M. Lyon. On 12/12/2025, he disposed of 245 common units (limited partner interests) at $54.85 per unit. Following this transaction, he beneficially owned 25,054 common units directly. MPLX LP is managed by the directors and executive officers of MPLX GP LLC, where Lyon serves as Senior Vice President, Logistics and Storage.

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^*

Lyon Shawn M

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Senior VP, Log. & Storage

3. Date of Earliest Transaction (Month/Day/Year)
12/12/2025

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)	12/12/2025		F		245	D	$54.85	25,054	D

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 Senior Vice President, Logistics and Storage 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 Shawn M. Lyon	12/16/2025
	** 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.
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FAQ

What insider transaction did MPLX (MPLX) report in this filing?

The filing shows that Senior Vice President, Logistics and Storage, Shawn M. Lyon disposed of 245 MPLX LP common units (limited partner interests) on 12/12/2025 at $54.85 per unit.

How many MPLX LP common units does Shawn M. Lyon own after the transaction?

After the reported transaction, Shawn M. Lyon beneficially owned 25,054 MPLX LP common units, held in direct ownership.

What is Shawn M. Lyon’s role in relation to MPLX LP?

Shawn M. Lyon is identified as an officer, serving as Senior Vice President, Logistics and Storage of MPLX GP LLC, the general partner that manages MPLX LP.

What type of security was involved in the MPLX insider transaction?

The transaction involved Common Units (Limited Partner Interests) of MPLX LP, reported as non-derivative securities in Table I.

Was the MPLX LP insider transaction reported as directly or indirectly owned?

The common units affected by the transaction and the remaining 25,054 units are reported as held in direct (D) ownership.

What transaction code was used for the MPLX LP insider transaction?

The transaction in Table I is labeled with transaction code F, indicating the nature of the disposition as defined in the form’s instructions.

Who signed the MPLX LP insider report on behalf of Shawn M. Lyon?

The report was signed by /s/ Molly R. Benson as Attorney-in-Fact for Shawn M. Lyon on 12/16/2025.