MPLX LP (MPLX) director receives 218.82-unit equity grant

Rhea-AI Filing Summary

MPLX LP (MPLX) reported that a director received an additional equity award in the form of common units. Reporting person Christine S. Breves acquired 218.82 common units of limited partner interests at a stated price of $0.00 per unit, increasing her direct holdings to 15,038.282 units.

Insider Trade Summary

Net Buyer: 218.82 shares

Net Buy 1 txn

Insider Breves Christine S

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Units (Limited Partner Interests)	218.82	$0.00	$0.00

Holdings After Transaction: Common Units (Limited Partner Interests) — 15,038.282 shares (Direct)

Key Figures

Units acquired: 218.8200 units Price per unit: $0.0000 Units owned after transaction: 15038.2820 units

3 metrics

Units acquired 218.8200 units Grant, award, or other acquisition of Common Units on 2026-08-14

Price per unit $0.0000 Stated transaction price per Common Unit for the award

Units owned after transaction 15038.2820 units Total direct holdings reported for Christine S. Breves after the award

Key Terms

Common Units (Limited Partner Interests), general partner, Rule 10b5-1

3 terms

Common Units (Limited Partner Interests) financial

"security_title: Common Units (Limited Partner Interests)"

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.

Rule 10b5-1 regulatory

"aff_10b5_one is the filing's document-level Rule 10b5-1 checkbox"

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.

FAQ

What insider transaction in MPLX (MPLX) did Christine S. Breves report?

Christine S. Breves reported acquiring 218.82 common units of MPLX LP as a grant or award. These are Common Units (Limited Partner Interests) and reflect additional equity compensation rather than an open-market purchase.

How many MPLX (MPLX) units does Christine S. Breves hold after this transaction?

After the reported grant, Christine S. Breves directly holds 15,038.282 common units of MPLX LP. This figure represents her total direct ownership reported following the August 14, 2026 transaction.

What was the price per unit in the latest MPLX (MPLX) insider award to Christine S. Breves?

The award to Christine S. Breves was reported at a price of $0.00 per unit. This indicates the transaction was a grant or award of equity, not a market purchase for cash consideration.

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

The filing indicates the Rule 10b5-1 checkbox is not selected. This means the reported acquisition of 218.82 units by Christine S. Breves was not affirmed as being made under a Rule 10b5-1 trading plan.

What role does the reporting person play in relation to MPLX (MPLX)?

The reporting person, Christine S. Breves, is 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.

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

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/18/2026 - 04:39 PM Accepted by SEC EDGAR 08/18/2026 - 04:38 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^*

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)
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		218.82	A	$0	15,038.282	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 Christine S. Breves	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)