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MPLX LP (NYSE: MPLX) director gets 3,028.941-unit 2026 equity retainer

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4/A

Rhea-AI Filing Summary

SEMPLE FRANK M reported acquisition or exercise transactions in this Form 4 filing.

Frank M. Semple, a director of MPLX GP LLC, received an annual 2026 equity retainer award of 3,028.941 Common Units of MPLX LP on April 30, 2026. After this grant, he beneficially owned 61,201.275 Common Units, all held directly.

The amended report corrects the size of the 2026 equity retainer and the resulting beneficial ownership balance as of April 30, 2026; it does not reflect any transactions after that date.

Positive

  • None.

Negative

  • None.
Insider SEMPLE FRANK M
Role Director
Type Security Shares Price Value
Grant/Award Common Units (Limited Partner Interests) F1, F2, F3 3,028.941 $0.00 $0.00
Holdings After Transaction: Common Units (Limited Partner Interests) — 61,201.275 shares (Direct)
Footnotes (3)
  1. F1. Represents the reporting person's annual 2026 equity retainer award.
  2. F2. This Form 4 is being amended to reflect the correct amount of the annual 2026 equity retainer award.
  3. F3. This amount reflects the correct balance of securities beneficially owned as of April 30, 2026. This balance does not include any transactions that occurred after April 30, 2026.
Equity retainer units granted 3,028.941 units Annual 2026 equity retainer award on April 30, 2026
Price per unit $0.0000 Stated grant price per Common Unit for 2026 equity retainer award
Total units owned after grant 61,201.275 units Beneficially owned Common Units as of April 30, 2026
Transaction date April 30, 2026 Grant date of the annual 2026 equity retainer award
annual 2026 equity retainer award financial
"Represents the reporting person's annual 2026 equity retainer award."
beneficially owned financial
"reflects the correct balance of securities beneficially owned as of April 30, 2026."
Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.
Common Units (Limited Partner Interests) financial
"Security title is Common Units (Limited Partner Interests)."

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Form 4 Insider Transactions: What Each Field Means →

FAQ

What insider equity award did MPLX (MPLX) director Frank M. Semple receive on April 30, 2026?
Frank M. Semple received 3,028.941 Common Units of MPLX LP as his annual 2026 equity retainer award. This grant was issued on April 30, 2026 and represents a non-cash equity retainer for his board service.

How many MPLX (MPLX) units does Frank M. Semple beneficially own after this 2026 equity award?
Following the 2026 equity retainer grant, Frank M. Semple beneficially owned 61,201.275 Common Units of MPLX LP. This balance is reported as of April 30, 2026 and excludes any transactions occurring after that date.

What type of security was granted to the MPLX (MPLX) director in the 2026 retainer award?
The 2026 equity retainer award to Frank M. Semple consisted of Common Units (Limited Partner Interests) in MPLX LP. These units function as the partnership’s primary equity security and were awarded as compensation for board service.

Was the 2026 MPLX (MPLX) equity retainer award to Frank M. Semple a market purchase?
No. The transaction is coded as an "A" grant or award, indicating a compensation-related acquisition, not a market purchase. The units were granted at a stated price of $0.0000 per unit as part of his director retainer.

What correction does the amended Form 4/A for MPLX (MPLX) make to Frank M. Semple’s 2026 award?
The amendment states that 3,028.941 units represent the correct amount of Frank M. Semple’s annual 2026 equity retainer award and updates his beneficial ownership balance to 61,201.275 units as of April 30, 2026.

Does the reported MPLX (MPLX) holding for Frank M. Semple include transactions after April 30, 2026?
No. A footnote explains that the 61,201.275-unit balance reflects securities beneficially owned as of April 30, 2026 and does not include any transactions that occurred after that date.
SEC Form 4
FORM 4UNITED 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)
XDirector10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
04/30/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)
05/04/2026
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)
CodeVAmount(A) or (D)Price
Common Units (Limited Partner Interests)04/30/2026A3,028.941(1)(2)A$061,201.275(3)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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
1. Represents the reporting person's annual 2026 equity retainer award.
2. This Form 4 is being amended to reflect the correct amount of the annual 2026 equity retainer award.
3. This amount reflects the correct balance of securities beneficially owned as of April 30, 2026. This balance does not include any transactions that occurred after April 30, 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 Frank M. Semple08/05/2026
** Signature of Reporting PersonDate
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