MPLX director granted 2,696.387 units for 2026 retainer

Breves Christine S reported acquisition or exercise transactions in this Form 4 filing.

Accepted by SEC EDGAR 08/05/2026 - 04:07 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Breves Christine S reported acquisition or exercise transactions in this Form 4 filing.

MPLX LP director Christine S. Breves received a grant of 2,696.387 Common Units (Limited Partner Interests) on April 30, 2026 as her annual 2026 equity retainer award. Following this grant, she beneficially owned 14,533.844 Common Units as of that date. This amended report corrects the previously reported award amount.

Insider Trade Summary

Grant/Award: 2,696.387 shares

Grant/Award 1 txn

Insider Breves Christine S

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Units (Limited Partner Interests) F1, F2, F3	2,696.387	$0.00	$0.00

Holdings After Transaction: Common Units (Limited Partner Interests) — 14,533.844 shares (Direct)

Footnotes (3)

1. F1. Represents the reporting person's annual 2026 equity retainer award.
2. F2. This Form 4 is being amended to reflect the correct amount of the annual 2026 equity retainer award.
3. F3. This amount reflects the correct balance of securities beneficially owned as of April 30, 2026. This balance does not include any transactions that occurred after April 30, 2026.

Key Figures

Equity retainer award units: 2,696.387 Common Units Units beneficially owned after award: 14,533.844 Common Units Award price per unit: 0.0000 per unit

3 metrics

Equity retainer award units 2,696.387 Common Units Annual 2026 equity retainer award granted on April 30, 2026

Units beneficially owned after award 14,533.844 Common Units Balance beneficially owned as of April 30, 2026

Award price per unit 0.0000 per unit Reported price for the 2026 equity retainer Common Units grant

Key Terms

Common Units (Limited Partner Interests), equity retainer award, beneficially owned

3 terms

Common Units (Limited Partner Interests) financial

"Reports Common Units (Limited Partner Interests) as the security granted"

equity retainer award financial

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

beneficially owned financial

"reflects the correct balance of securities beneficially owned as of April 30, 2026"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

FAQ

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

What equity award did MPLX (MPLX) director Christine S. Breves receive?

Christine S. Breves received 2,696.387 Common Units (Limited Partner Interests) in MPLX LP on April 30, 2026 as her annual 2026 equity retainer award. The units were granted at a reported price of 0.0000 per unit, indicating a compensation award rather than a market purchase.

Why was this Form 4/A amendment filed for MPLX (MPLX)?

The amendment states it is filed to reflect the correct amount of the annual 2026 equity retainer award. The original report misstated the award size, and this filing updates the reported 2,696.387 Common Units and the related post-award holdings balance.

How many MPLX (MPLX) units does Christine S. Breves now beneficially own?

After the award, Christine S. Breves beneficially owned 14,533.844 Common Units of MPLX LP as of April 30, 2026. A footnote clarifies that this balance does not include any transactions that occurred after that date, so later changes are not reflected here.

What type of security was reported in this MPLX (MPLX) Form 4/A?

The filing reports Common Units (Limited Partner Interests) of MPLX LP. These units represent limited partner interests rather than traditional corporate shares, and the grant of 2,696.387 units was made as part of the director’s 2026 equity retainer compensation.

Was the MPLX (MPLX) equity award made under a Rule 10b5-1 trading plan?

The Rule 10b5-1 checkbox in the insider report is not marked, indicating the transaction was not made pursuant to a Rule 10b5-1 trading plan. It is characterized instead as a grant or award of compensation units to the director.

What is the ownership nature of Christine S. Breves’s MPLX (MPLX) units after this award?

The filing classifies her holdings as direct ownership of 14,533.844 Common Units following the grant on April 30, 2026. No footnotes reattribute these units to a trust or other entity, so they are reported as directly beneficially owned by the director.

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^*

Breves Christine S

(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)
05/04/2026

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		2,696.387(1)(2)	A	$0	14,533.844(3)	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.

2. This Form 4 is being amended to reflect the correct amount of the annual 2026 equity retainer award.

3. This amount reflects the correct balance of securities beneficially owned as of April 30, 2026. This balance does not include any transactions that occurred after April 30, 2026.

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 Christine S. Breves	08/05/2026
	** 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)