Director at MPLX (NYSE: MPLX) receives equity grant and holds 4,069 units

Rhea-AI Filing Summary

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

MPLX LP director Ray N. Walker Jr. received a grant of 78.436 Common Units (Limited Partner Interests) on May 15, 2026 as a non-cash award. Following this grant, his directly held position increased to 4,069.124 common units, reflecting routine equity-based compensation rather than an open-market purchase.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Walker Ray N JR

Role null

Type	Security	Shares	Price	Value
Grant/Award	Common Units (Limited Partner Interests)	78.436	$0.00	--

Holdings After Transaction: Common Units (Limited Partner Interests) — 4,069.124 shares (Direct, null)

Footnotes (1)

Key Figures

Units granted: 78.436 units Price per unit: 0.0000 per unit Units owned after grant: 4,069.124 units +2 more

5 metrics

Units granted 78.436 units Common Units grant on May 15, 2026

Price per unit 0.0000 per unit Reported grant price

Units owned after grant 4,069.124 units Direct holdings after transaction

Acquisition transactions 1 transaction Non-derivative grant/award acquisition

Sell transactions 0 transactions No sales reported in summary

Key Terms

Common Units (Limited Partner Interests), grant/award acquisition, Form 4, non-derivative

4 terms

Common Units (Limited Partner Interests) financial

"security_title: Common Units (Limited Partner Interests)"

grant/award acquisition financial

"transaction_action: grant/award acquisition"

Form 4 regulatory

"INSIDER FILING DATA (Form 4)"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

non-derivative financial

"transaction_type: non-derivative"

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^*

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)
05/15/2026

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)	05/15/2026		A		78.436	A	$0	4,069.124	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.	05/19/2026
	** 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)

FAQ

What insider transaction did MPLX (MPLX) disclose in this Form 4?

MPLX reported that director Ray N. Walker Jr. received a grant of 78.436 Common Units (Limited Partner Interests). The units were awarded at a reported price of 0.0000 per unit, indicating a compensation-related equity award rather than a market purchase.

How many MPLX (MPLX) units does the director hold after this award?

After the reported grant, director Ray N. Walker Jr. directly holds 4,069.124 MPLX Common Units. This total includes the 78.436 units awarded in the latest transaction and represents his direct ownership position following the grant-acquisition reported in the Form 4.

Was the MPLX (MPLX) insider transaction a purchase or a grant?

The transaction was a grant or award acquisition, not an open-market purchase. The Form 4 classifies it under code A, described as a grant, award, or other acquisition, with a transaction price of 0.0000 per unit, typical for equity compensation grants.

Did the MPLX (MPLX) director sell any units in this Form 4 filing?

No sales were reported in this Form 4. The transaction summary shows one acquisition event and zero sell, exercise, gift, or tax-withholding transactions, indicating only an increase in directly held units from a compensation-related award during the reported period.

Does the MPLX (MPLX) Form 4 show any derivative securities activity?

The filing shows no derivative securities activity. The derivativeSummary is empty and the transactionSummary reports zero derivative transactions, exercises, or restructurings, suggesting this Form 4 only records a non-derivative common unit grant to the director.