MPLX (MPLX) director Frank Semple reports 1,194-unit equity grant and updated holdings

Rhea-AI Filing Summary

MPLX LP director Frank M. Semple reported a grant of 1,194.074 Common Units (Limited Partner Interests) on May 15, 2026. The units were acquired at a stated price of $0.00 per unit as a grant or award, indicating compensation rather than an open-market purchase.

After this transaction, Semple directly holds 61,945.951 MPLX common units. He also has indirect interests in additional MPLX units held through entities, including EK Holdings LLC, the Robin Y Semple 2012 Dynasty Trust, and the Frank M Semple Revocable Trust, each with reported unit balances as of the same date.

Insights

Equity compensation analyst

Director received a modest equity grant, with no market buying or selling.

The filing shows Frank M. Semple, a director of MPLX LP, receiving 1,194.074 common units at a stated price of $0.00 per unit. The transaction code A identifies this as a grant, award, or similar acquisition, typical of director compensation.

No open-market purchases or sales are reported; the filing mainly updates Semple’s direct holding to 61,945.951 units and lists indirect positions held via entities and trusts. This looks like routine equity compensation and ownership reporting, without a clear signal about Semple’s view of MPLX’s valuation.

Insider Trade Summary

4 transactions reported

Mixed 4 txns

Insider SEMPLE FRANK M

Role null

Type	Security	Shares	Price	Value
Grant/Award	Common Units (Limited Partner Interests)	1,194.074	$0.00	--
holding	Common Units (Limited Partner Interests)	--	--	--
holding	Common Units (Limited Partner Interests)	--	--	--
holding	Common Units (Limited Partner Interests)	--	--	--

Holdings After Transaction: Common Units (Limited Partner Interests) — 61,945.951 shares (Direct, null); Common Units (Limited Partner Interests) — 333,337 shares (Indirect, Frank M Semple Revocable Trust)

Footnotes (1)

Key Figures

Equity grant: 1,194.074 units Grant price: $0.00 per unit Direct holdings after grant: 61,945.951 units +3 more

6 metrics

Equity grant 1,194.074 units Common Units (Limited Partner Interests) granted May 15, 2026

Grant price $0.00 per unit Stated price for 1,194.074-unit award

Direct holdings after grant 61,945.951 units Total MPLX common units directly held after transaction

EK Holdings LLC units 48,777 units Indirect MPLX common units via EK Holdings LLC

Robin Y Semple 2012 Dynasty Trust units 111,180 units Indirect MPLX common units via Dynasty Trust

Frank M Semple Revocable Trust units 333,337 units Indirect MPLX common units via Revocable Trust

Key Terms

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

4 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""

indirect ownership financial

"ownership_type: "indirect" with nature_of_ownership trusts and LLCs"

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^*

SEMPLE FRANK M

(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		1,194.074	A	$0	61,945.951	D
Common Units (Limited Partner Interests)								333,337	I	Frank M Semple Revocable Trust
Common Units (Limited Partner Interests)								111,180	I	Robin Y Semple 2012 Dynasty Trust
Common Units (Limited Partner Interests)								48,777	I	EK Holdings LLC

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 Frank M. Semple	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 Frank M. Semple report on this Form 4?

Frank M. Semple reported receiving a grant of 1,194.074 MPLX common units on May 15, 2026. The units were acquired at a stated price of $0.00 per unit as a grant, indicating equity-based compensation rather than an open-market purchase or sale.

How many MPLX units does Frank M. Semple hold directly after this Form 4?

After the reported grant, Frank M. Semple directly holds 61,945.951 MPLX common units. This figure reflects his updated direct ownership position following the 1,194.074-unit award, as disclosed in the Form 4 filed for the May 15, 2026 transaction date.

Were there any MPLX unit purchases or sales by Frank M. Semple in the market?

The Form 4 does not show any open-market purchases or sales by Frank M. Semple. It reports a grant of 1,194.074 common units at a stated price of $0.00 and lists indirect holdings through various entities and trusts without recorded buy or sell transactions.

What indirect MPLX holdings related to Frank M. Semple are disclosed in this filing?

The filing lists indirect MPLX common unit holdings associated with EK Holdings LLC, the Robin Y Semple 2012 Dynasty Trust, and the Frank M Semple Revocable Trust. Each entity reports its own total unit balance, reflecting ownership connected to Semple through these vehicles rather than in his name directly.

What does transaction code A mean in Frank M. Semple’s MPLX Form 4?

Transaction code A on the Form 4 indicates a grant, award, or other acquisition of securities. For Frank M. Semple, it identifies the 1,194.074 MPLX common units as an equity grant received at a stated price of $0.00, consistent with non-cash director compensation.