MPLX director granted 1,563 common units

MPLX LP (MPLX) reported that a director received a grant of common units representing limited partner interests.

Rhea-AI Filing Summary

MPLX LP (MPLX) reported that a director received a grant of common units representing limited partner interests. On 2026-08-14, the reporting person acquired 1,563.4270 common units in a grant or award transaction at a stated price of $0.0000 per unit, bringing the director’s directly held position to 95,447.7770 units.

Insider Trade Summary

Grant/Award: 1,563.427 shares

Grant/Award 1 txn

Insider SURMA JOHN P

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Units (Limited Partner Interests)	1,563.427	$0.00	$0.00

Holdings After Transaction: Common Units (Limited Partner Interests) — 95,447.777 shares (Direct)

Key Figures

Units acquired: 1,563.4270 units Price per unit: $0.0000 Units owned after transaction: 95,447.7770 units +2 more

5 metrics

Units acquired 1,563.4270 units Common units granted on 2026-08-14

Price per unit $0.0000 Stated per-unit value for the grant transaction

Units owned after transaction 95,447.7770 units Total direct common units held following the award

Acquisition transactions in filing 1 Count of acquire-type transactions in this Form 4

Sell transactions in filing 0 No sales reported in the transaction summary

Key Terms

Common Units (Limited Partner Interests), grant/award acquisition, direct or indirect, Rule 10b5-1

4 terms

Common Units (Limited Partner Interests) financial

"security_title: Common Units (Limited Partner Interests)"

grant/award acquisition financial

"transaction_action: grant/award acquisition"

direct or indirect financial

"direct_or_indirect: D"

Rule 10b5-1 regulatory

"aff_10b5_one: false, 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

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

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

MPLX reported that a director received a grant of 1,563.4270 common units on 2026-08-14. The transaction was coded as an acquisition related to a grant or award rather than an open-market purchase.

How many MPLX (MPLX) units does the reporting person hold after this transaction?

After the award, the reporting person directly holds 95,447.7770 common units of MPLX. This figure represents the total direct ownership of common units immediately following the reported 2026-08-14 grant transaction.

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

The filing identifies the transaction as a grant, award, or other acquisition coded "A", not a market purchase. The per-unit price is reported as $0.0000, consistent with a compensatory equity award rather than a cash-funded buy.

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

No sales are reported in this Form 4. The transaction summary shows one acquisition and no sales, gifts, or derivative exercises, indicating only an increase in direct holdings from the award.

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

The filing indicates the Rule 10b5-1 checkbox is not marked for this transaction. That means the reported grant was not affirmed as executed under a pre-arranged 10b5-1 trading plan based on the document’s checkbox status.

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

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Available on EDGAR 08/18/2026 - 04:49 PM Accepted by SEC EDGAR 08/18/2026 - 04:49 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^*

SURMA JOHN P

(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		1,563.427	A	$0	95,447.777	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 John P. Surma	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)