MPLX director granted 2,246.989 common units

Walker Ray N JR reported acquisition or exercise transactions in this Form 4 filing.

Accepted by SEC EDGAR 05/04/2026 - 05:18 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Walker Ray N JR reported acquisition or exercise transactions in this Form 4 filing.

MPLX LP director Walker Ray N. Jr. received an equity grant of 2,246.989 Common Units (limited partner interests) of MPLX LP on April 30, 2026. The units were awarded at a stated price of $0.00 per unit as his annual 2026 equity retainer award. After this grant, he holds a total of 3,990.688 common units directly.

Insider Trade Summary

Grant/Award: 2,246.989 shares

Grant/Award 1 txn

Insider Walker Ray N JR

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Units (Limited Partner Interests)	2,246.989	$0.00	$0.00

Holdings After Transaction: Common Units (Limited Partner Interests) — 3,990.688 shares (Direct)

Footnotes (1)

1. F1. Represents the reporting person's annual 2026 equity retainer award.

Key Figures

Equity grant size: 2,246.989 units Grant price per unit: $0.00 per unit Holdings after grant: 3,990.688 units +1 more

4 metrics

Equity grant size 2,246.989 units Annual 2026 equity retainer award

Grant price per unit $0.00 per unit Stated transaction price for equity award

Holdings after grant 3,990.688 units Common units directly held after transaction

Transaction code A Grant, award, or other acquisition of units

Key Terms

Common Units (Limited Partner Interests), annual 2026 equity retainer award, Grant, award, or other acquisition

3 terms

Common Units (Limited Partner Interests) financial

"security_title: "Common Units (Limited Partner Interests)""

annual 2026 equity retainer award financial

"Represents the reporting person's annual 2026 equity retainer award."

Grant, award, or other acquisition financial

"transaction_code_description: "Grant, award, or other acquisition""

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did MPLX director Walker Ray N. Jr. report?

MPLX director Walker Ray N. Jr. reported receiving 2,246.989 Common Units as an equity grant. The award was his annual 2026 equity retainer and carried a stated price of $0.00 per unit, indicating it was compensation rather than a market purchase.

How many MPLX units does Walker Ray N. Jr. hold after this Form 4?

Following the reported grant, Walker Ray N. Jr. directly holds 3,990.688 MPLX common units. This total reflects his position after receiving the 2,246.989-unit annual 2026 equity retainer award granted at a stated price of $0.00 per unit.

Was the MPLX insider transaction a market buy or a compensation award?

The MPLX insider transaction was a compensation award, not a market buy. The Form 4 code “A” and a $0.00 per-unit price show the 2,246.989 units were granted as the director’s annual 2026 equity retainer, rather than purchased on the open market.

What security was involved in the MPLX Form 4 for Walker Ray N. Jr.?

The Form 4 involves MPLX LP’s Common Units (Limited Partner Interests). Walker Ray N. Jr. received 2,246.989 of these units as his 2026 equity retainer award, bringing his directly held total to 3,990.688 units after the transaction was recorded.

Does the MPLX Form 4 indicate any share sales by Walker Ray N. Jr.?

The Form 4 reports only an acquisition of units via an equity grant, with no sales. It shows a single “A” code transaction, granting 2,246.989 common units at a stated price of $0.00 and resulting in 3,990.688 units held directly afterward.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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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^*

Walker Ray N JR

(Last) (First) (Middle)

C/O MPLX LP

200 E. HARDIN STREET

(Street)

FINDLAY OHIO 45840

(City) (State) (Zip)

UNITED STATES

(Country)

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)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/30/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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)	04/30/2026		A		2,246.989(1)	A	$0	3,990.688	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:

1. Represents the reporting person's annual 2026 equity retainer award.

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 Ray N. Walker Jr.	05/04/2026
	** 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.
* Form 4: SEC 1474 (03-26)