MPLX director granted 1,232 common units

Q: What insider transaction did MPLX (MPLX) disclose for director Garry L. Peiffer?

MPLX disclosed that a director received a grant of 1,232.166 Common Units on August 14, 2026. The acquisition was reported as a grant or award with a stated price of $0.0000 per unit, indicating non-cash equity compensation.

Q: How many MPLX (MPLX) units does the director hold directly after this transaction?

Following the award, the director holds 69,313.2300 MPLX common units directly. This figure represents the total direct ownership position after giving effect to the August 14, 2026 equity grant reported in the Form 4 filing.

Q: What indirect MPLX (MPLX) holdings are reported for the director?

The filing reports 68,497.0000 MPLX common units held indirectly through a revocable trust. The trust is identified as the Garry L. and Kathleen J. Peiffer Trust, created on April 24, 2026, with ownership classified as indirect on the Form 4.

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

The Form 4 indicates the Rule 10b5-1 checkbox is not checked. This means the reported August 14, 2026 equity grant was not affirmatively identified as executed pursuant to a Rule 10b5-1 trading plan in the filing.

Q: What type of security did the MPLX (MPLX) director receive in this Form 4?

The director received Common Units (Limited Partner Interests) of MPLX. These units represent equity in the partnership and were characterized in the filing as a grant, award, or other acquisition rather than an open-market purchase or sale.

MPLX LP (symbol MPLX) reports that a director received an equity award of 1,232.166 Common Units (Limited Partner Interests) on August 14, 2026.

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

MPLX LP (symbol MPLX) reports that a director received an equity award of 1,232.166 Common Units (Limited Partner Interests) on August 14, 2026. The units were acquired as a grant or award at a stated price of $0.0000 per unit, reflecting non-cash compensation.

After this award, the director holds 69,313.2300 MPLX common units directly. In addition, 68,497.0000 units are held indirectly through a revocable trust identified as the Garry L. and Kathleen J. Peiffer Trust, created on April 24, 2026.

Insider Trade Summary

Grant/Award: 1,232.166 shares

Grant/Award 2 txns

Insider Peiffer Garry L.

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Units (Limited Partner Interests)	1,232.166	$0.00	$0.00
holding	Common Units (Limited Partner Interests) ^F1	--	--	--

Holdings After Transaction: Common Units (Limited Partner Interests) — 69,313.23 shares (Direct); Common Units (Limited Partner Interests) — 68,497 shares (Indirect, By Revocable Trust)

Footnotes (1)

F1. By Garry L. and Kathleen J. Peiffer Trust, created on April 24, 2026.

Key Figures

Equity units granted: 1,232.1660 units Grant price per unit: $0.0000 per unit Direct holdings after transaction: 69,313.2300 units +1 more

4 metrics

Equity units granted 1,232.1660 units Common Units (Limited Partner Interests) awarded on August 14, 2026

Grant price per unit $0.0000 per unit Stated price for the August 14, 2026 equity award

Direct holdings after transaction 69,313.2300 units Total MPLX common units held directly by the director after the award

Indirect holdings via trust 68,497.0000 units MPLX common units held indirectly by revocable trust after the reported date

Key Terms

Common Units (Limited Partner Interests), grant/award acquisition, Revocable Trust

3 terms

Common Units (Limited Partner Interests) financial

"The director received 1,232.166 Common Units (Limited Partner Interests) as an award"

grant/award acquisition financial

"The units were acquired as a grant/award acquisition at a stated price"

Revocable Trust financial

"Units are held indirectly through a Revocable Trust identified in the filing"

A revocable trust is a legal arrangement where the person who creates it keeps control and can change or cancel the trust at any time, while naming who will manage and receive the assets later. Think of it like a flexible folder for your investments and property that can be relabeled or reworked as circumstances change; it matters to investors because it determines how ownership is recorded, how easily assets transfer on incapacity or death, and whether holdings bypass public probate proceedings.

FAQ

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

What insider transaction did MPLX (MPLX) disclose for director Garry L. Peiffer?

MPLX disclosed that a director received a grant of 1,232.166 Common Units on August 14, 2026. The acquisition was reported as a grant or award with a stated price of $0.0000 per unit, indicating non-cash equity compensation.

How many MPLX (MPLX) units does the director hold directly after this transaction?

Following the award, the director holds 69,313.2300 MPLX common units directly. This figure represents the total direct ownership position after giving effect to the August 14, 2026 equity grant reported in the Form 4 filing.

What indirect MPLX (MPLX) holdings are reported for the director?

The filing reports 68,497.0000 MPLX common units held indirectly through a revocable trust. The trust is identified as the Garry L. and Kathleen J. Peiffer Trust, created on April 24, 2026, with ownership classified as indirect on the Form 4.

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

The Form 4 indicates the Rule 10b5-1 checkbox is not checked. This means the reported August 14, 2026 equity grant was not affirmatively identified as executed pursuant to a Rule 10b5-1 trading plan in the filing.

What type of security did the MPLX (MPLX) director receive in this Form 4?

The director received Common Units (Limited Partner Interests) of MPLX. These units represent equity in the partnership and were characterized in the filing as a grant, award, or other acquisition rather than an open-market purchase or sale.

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

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Available on EDGAR 08/18/2026 - 05:31 PM Accepted by SEC EDGAR 08/18/2026 - 05:31 PM

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^*

Peiffer Garry L.

(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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Units (Limited Partner Interests)	08/14/2026		A		1,232.166	A	$0	69,313.23	D
Common Units (Limited Partner Interests)								68,497	I	By Revocable Trust⁽¹⁾

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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. By Garry L. and Kathleen J. Peiffer Trust, created on April 24, 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 Garry L. Peiffer	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)

Source: View Original Filing on SEC EDGAR