MPLX director granted 81.939 common units

MPLX LP (MPLX) reported an insider equity award for director Walker Ray N Jr.

Rhea-AI Filing Summary

MPLX LP (MPLX) reported an insider equity award for director Walker Ray N Jr. He received a grant of 81.939 Common Units (Limited Partner Interests) on 2026-08-14 at a stated price of $0.0000 per unit, increasing his directly held units to 4,609.294 following the transaction. The award is characterized as a grant or other acquisition rather than an open-market purchase, and the Rule 10b5-1 plan checkbox was not selected.

Insider Trade Summary

Grant/Award: 81.939 shares

Grant/Award 1 txn

Insider Walker Ray N JR

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Units (Limited Partner Interests)	81.939	$0.00	$0.00

Holdings After Transaction: Common Units (Limited Partner Interests) — 4,609.294 shares (Direct)

Key Figures

Units granted: 81.939 units Price per unit: $0.0000 per unit Holdings after transaction: 4,609.294 units +1 more

4 metrics

Units granted 81.939 units Common Units (Limited Partner Interests) granted on 2026-08-14

Price per unit $0.0000 per unit Stated transaction price for the 81.939-unit award

Holdings after transaction 4,609.294 units Total Common Units directly owned by Walker Ray N Jr. after the grant

Acquisition transactions 1 Number of acquire-type transactions reported in this Form 4

Key Terms

Common Units (Limited Partner Interests), Rule 10b5-1, general partner, grant, award, or other acquisition

4 terms

Common Units (Limited Partner Interests) financial

"security_title: Common Units (Limited Partner Interests)"

Rule 10b5-1 regulatory

"aff_10b5_one indicates the Rule 10b5-1 checkbox status"

Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

general partner financial

"MPLX GP LLC, the general partner of the Issuer"

A general partner is the person or firm that runs an investment partnership and legally represents it — they make the day-to-day decisions, choose which assets to buy or sell, and are responsible for the partnership’s obligations. Investors care because the general partner’s judgment, risk-taking and fee and profit-sharing arrangements determine both the potential returns and the level of exposure to losses; think of the GP as the ship’s captain whose skill and honesty shape the voyage’s outcome.

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 (MPLX) report for Walker Ray N Jr.?

MPLX reported that director Walker Ray N Jr. received a grant of 81.939 Common Units on 2026-08-14. This was a grant/award acquisition, not an open-market trade, and increased his directly held units.

How many MPLX (MPLX) units does Walker Ray N Jr. hold after this transaction?

After the reported grant, Walker Ray N Jr. directly holds 4,609.294 Common Units of MPLX LP. This figure reflects his position following the 81.939-unit award reported in the Form 4 filing.

What was the price per unit for the MPLX (MPLX) grant to Walker Ray N Jr.?

The Form 4 lists a transaction price of $0.0000 per Common Unit for the 81.939-unit award. This supports characterization as a compensation-related grant or award rather than a market purchase for cash consideration.

Was the MPLX (MPLX) insider transaction made under a Rule 10b5-1 plan?

The filing’s Rule 10b5-1 checkbox is not selected, and aff_10b5_one is reported as false. That indicates the reported grant was not affirmatively designated as made under a Rule 10b5-1 trading plan.

What role does Walker Ray N Jr. have at MPLX (MPLX)?

Walker Ray N Jr. is reported as a Director of MPLX GP LLC, the general partner of MPLX LP. MPLX LP is managed by the directors and executive officers of MPLX GP LLC, so his role connects to the issuer’s governance.

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

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Available on EDGAR 08/18/2026 - 04:52 PM Accepted by SEC EDGAR 08/18/2026 - 04:52 PM Learn about SEC filing dates

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)
08/14/2026

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)	08/14/2026		A		81.939	A	$0	4,609.294	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 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.	08/18/2026
	** 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)