MPLX LP (MPLX) Executive Chairman reports 1,335-unit insider transaction

Rhea-AI Filing Summary

MPLX LP reported an insider disposition of common units by Executive Chairman and director Michael J. Hennigan. On December 12, 2025, he disposed of 1,335 MPLX common units (limited partner interests) at $54.85 per unit in a transaction coded “F.”

Following this transaction, he directly beneficially owned 359,137 MPLX common units. He serves as Executive Chairman of the Board of Directors of MPLX GP LLC, the general partner that manages MPLX LP through its directors and executive officers.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Hennigan Michael J

Role Executive Chairman

Type	Security	Shares	Price	Value
Tax Withholding	Common Units (Limited Partner Interests)	1,335	$54.85	$73K

Holdings After Transaction: Common Units (Limited Partner Interests) — 359,137 shares (Direct)

Footnotes (1)

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Form 4 Insider Transactions: What Each Field Means →

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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^*

Hennigan Michael J

(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
X	Officer (give title below)		Other (specify below)
	Executive Chairman

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		1,335	D	$54.85	359,137	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 Executive Chairman of the Board of Directors 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 Michael J. Hennigan	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.
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 LP (MPLX) disclose for Michael J. Hennigan?

The report shows that Michael J. Hennigan disposed of 1,335 common units of MPLX LP (limited partner interests) at a price of $54.85 per unit in a transaction coded “F.”

When did the reported MPLX LP (MPLX) insider transaction occur?

The insider transaction for MPLX LP (MPLX) took place on December 12, 2025, as reflected in the transaction date in Table I.

How many MPLX LP (MPLX) units does Michael J. Hennigan own after the transaction?

After the reported transaction, Michael J. Hennigan beneficially owned 359,137 MPLX common units, held in direct ownership form.

What is Michael J. Hennigan’s role and relationship to MPLX LP (MPLX)?

Michael J. Hennigan is identified as a Director and Officer of MPLX LP, serving as Executive Chairman. He is also Executive Chairman of the Board of Directors of MPLX GP LLC, the general partner that manages MPLX LP.

Is Michael J. Hennigan’s ownership in MPLX LP (MPLX) direct or indirect after this transaction?

Following the transaction, the 359,137 MPLX common units reported as beneficially owned by Michael J. Hennigan are held in direct ownership form.