MPLX LP: Bruce L. Niemeyer receives unit grant

The reported transaction is classified as a grant or award acquisition.

Available on EDGAR 11/03/2026 - 04:19 PM EST Accepted by SEC EDGAR 11/03/2026 - 04:19 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

MPLX LP reports that Bruce L. Niemeyer, a director of its general partner, acquired 1,276.7110 common units in a grant or award on November 1, 2026. His reported direct holdings after the transaction were 1,276.7110 common units. The acquisition was not reported under a Rule 10b5-1 plan.

Insider Trade Summary

Grant/Award: 1,276.711 shares

Grant/Award 1 txn

Insider Niemeyer Bruce L

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Units (Limited Partner Interests)	1,276.711	$0.00	$0.00

Holdings After Transaction: Common Units (Limited Partner Interests) — 1,276.711 shares (Direct)

Key Figures

Common units acquired: 1,276.7110 common units Direct common units after transaction: 1,276.7110 common units

2 metrics

Common units acquired 1,276.7110 common units Grant or award on November 1, 2026

Direct common units after transaction 1,276.7110 common units Reported following the November 1, 2026 transaction

Key Terms

Common Units, Limited Partner Interests, general partner

3 terms

Common Units financial

"Common Units (Limited Partner Interests)"

Common units are the basic ownership stakes in a company, limited partnership, or trust that function like common stock: they give holders a claim on profits and often voting rights. Think of them as the ordinary seats at a table—the most directly affected by the business’s success or failure, so they typically offer higher upside but carry greater risk than preferred claims or creditors, which matters to investors evaluating potential return and safety.

Limited Partner Interests financial

"Common Units (Limited Partner Interests)"

An investor's ownership stake in a limited partnership that gives them rights to a share of profits and losses but not day-to-day control over the business, similar to being a silent partner in a project. For investors this matters because it defines how they earn returns, how much risk and liability they carry, and how easy it is to sell their position — all key factors when valuing and comparing investments.

general partner financial

"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.

FAQ

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

How many MPLX common units did director Bruce L. Niemeyer acquire?

Bruce L. Niemeyer acquired 1,276.7110 common units on November 1, 2026, in a grant or award. His reported direct holdings after the transaction were 1,276.7110 common units. The acquisition was not reported under a Rule 10b5-1 plan.

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

Form 4 Insider Transactions: What Each Field Means →

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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^*

Niemeyer Bruce 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)
11/01/2026

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)	11/01/2026		A		1,276.711	A	$0	1,276.711	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 Bruce L. Niemeyer	11/03/2026
	** 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)