MPLX LP (NYSE: MPLX) director granted 2,579.543 units

Rhea-AI Filing Summary

SEMPLE FRANK M reported acquisition or exercise transactions in this Form 4 filing.

MPLX LP director Frank M. Semple reported an equity award and updated holdings in common units. He received 2,579.543 common units as his annual 2026 equity retainer award at a stated price of $0.00 per unit, increasing his direct holdings to 60,751.877 units. The filing also lists indirect ownership of MPLX common units through EK Holdings LLC, the Robin Y Semple 2012 Dynasty Trust, and the Frank M Semple Revocable Trust.

Insider Trade Summary

4 transactions reported

Mixed 4 txns

Insider SEMPLE FRANK M

Role null

Type	Security	Shares	Price	Value
Grant/Award	Common Units (Limited Partner Interests)	2,579.543	$0.00	--
holding	Common Units (Limited Partner Interests)	--	--	--
holding	Common Units (Limited Partner Interests)	--	--	--
holding	Common Units (Limited Partner Interests)	--	--	--

Holdings After Transaction: Common Units (Limited Partner Interests) — 60,751.877 shares (Direct, null); Common Units (Limited Partner Interests) — 333,337 shares (Indirect, Frank M Semple Revocable Trust)

Footnotes (1)

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Key Figures

2026 equity retainer award: 2,579.543 common units Grant price per unit: $0.00 per unit Direct holdings after grant: 60,751.877 units +3 more

6 metrics

2026 equity retainer award 2,579.543 common units Annual 2026 equity retainer grant to director

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

Direct holdings after grant 60,751.877 units Common units directly owned following 2026 award

Indirect holdings via EK Holdings LLC 48,777 units Common units held indirectly through EK Holdings LLC

Indirect holdings via Robin Y Semple 2012 Dynasty Trust 111,180 units Common units held indirectly via Robin Y Semple 2012 Dynasty Trust

Indirect holdings via Frank M Semple Revocable Trust 333,337 units Common units held indirectly via Frank M Semple Revocable Trust

Key Terms

annual 2026 equity retainer award, Common Units (Limited Partner Interests), indirect ownership

3 terms

annual 2026 equity retainer award financial

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

Common Units (Limited Partner Interests) financial

"Security title is listed as Common Units (Limited Partner Interests)."

indirect ownership financial

"Entries show indirect ownership through EK Holdings LLC and various trusts."

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^*

SEMPLE FRANK M

(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		2,579.543(1)	A	$0	60,751.877	D
Common Units (Limited Partner Interests)								333,337	I	Frank M Semple Revocable Trust
Common Units (Limited Partner Interests)								111,180	I	Robin Y Semple 2012 Dynasty Trust
Common Units (Limited Partner Interests)								48,777	I	EK Holdings LLC

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 Frank M. Semple	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)

FAQ

What did the MPLX (MPLX) Form 4 report for Frank M. Semple?

The Form 4 shows director Frank M. Semple received 2,579.543 MPLX common units as his annual 2026 equity retainer award, bringing his directly held units to 60,751.877 and updating several indirect ownership positions held through trusts and an LLC.

How many MPLX units did Frank M. Semple receive in his 2026 equity retainer?

Frank M. Semple received 2,579.543 MPLX common units as his annual 2026 equity retainer award. These units were reported at a price of $0.00 per unit, reflecting a compensation grant rather than an open-market purchase of MPLX units.

What are Frank M. Semple’s direct MPLX holdings after this Form 4?

After the reported equity grant, Frank M. Semple directly holds 60,751.877 MPLX common units. This figure reflects his updated direct ownership position following receipt of the 2,579.543-unit annual 2026 equity retainer award disclosed in the Form 4 filing.

Which indirect MPLX holdings are reported for Frank M. Semple?

The filing lists MPLX units held indirectly through EK Holdings LLC, the Robin Y Semple 2012 Dynasty Trust, and the Frank M Semple Revocable Trust, with each entry showing total units following the reported date, indicating separate indirect ownership positions associated with the director.

Was the MPLX equity grant to Frank M. Semple an open-market purchase?

No, the 2,579.543 MPLX units were reported with transaction code A, indicating a grant, award, or other acquisition. The units were valued at $0.00 per unit, consistent with compensation rather than an open-market transaction on a securities exchange.