MPLX (MPLX) director Christine Breves receives 276-unit equity award

Rhea-AI Filing Summary

MPLX LP director Christine S. Breves received an award of 276.829 Common Units (Limited Partner Interests) of MPLX LP on May 15, 2026. The units were granted at a price of $0.0000 per unit as part of a compensation-related grant or award, not an open-market purchase.

After this award, Breves directly holds a total of 14,361.275 common units of MPLX LP. The filing does not report any sales, option exercises, gifts, or tax-withholding transactions, only this single acquisition of additional units.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Breves Christine S

Role null

Type	Security	Shares	Price	Value
Grant/Award	Common Units (Limited Partner Interests)	276.829	$0.00	--

Holdings After Transaction: Common Units (Limited Partner Interests) — 14,361.275 shares (Direct, null)

Footnotes (1)

Key Figures

Units granted: 276.829 common units Grant price: $0.0000 per unit Holdings after transaction: 14,361.275 common units

3 metrics

Units granted 276.829 common units Grant or award on May 15, 2026

Grant price $0.0000 per unit Transaction price for awarded units

Holdings after transaction 14,361.275 common units Direct ownership following the grant

Key Terms

Common Units (Limited Partner Interests), Grant, award, or other acquisition, Form 4

3 terms

Common Units (Limited Partner Interests) financial

"security_title: "Common Units (Limited Partner Interests)""

Grant, award, or other acquisition financial

"transaction_code_description: "Grant, award, or other 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.

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^*

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)
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		276.829	A	$0	14,361.275	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	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 director Christine S. Breves report?

Christine S. Breves reported receiving 276.829 MPLX common units as a grant or award. The Form 4 shows this as a compensation-related acquisition at a price of $0.0000 per unit, rather than an open-market purchase or sale.

How many MPLX units does Christine S. Breves hold after this Form 4 transaction?

After the reported grant, Christine S. Breves directly holds 14,361.275 MPLX common units. This total reflects her updated direct ownership position following the award of 276.829 additional units disclosed in the Form 4 filing.

Was the MPLX insider transaction a purchase or a compensation grant?

The transaction was a compensation grant, not an open-market purchase. The Form 4 classifies it as a “Grant, award, or other acquisition,” with 276.829 common units received at a transaction price of $0.0000 per unit.

Did Christine S. Breves sell any MPLX units in this Form 4 filing?

No sales were reported in this Form 4. The filing shows only an acquisition of 276.829 MPLX common units as a grant or award, with no dispositions, gifts, tax withholdings, or restructuring transactions disclosed for this date.

What type of security did the MPLX Form 4 transaction involve?

The transaction involved MPLX “Common Units (Limited Partner Interests).” These units represent limited partner interests in MPLX LP, and the filing shows that 276.829 such units were granted to director Christine S. Breves on May 15, 2026.