MPLX (NYSE: MPLX) expands GP board to 11, names Ray N. Walker Jr.

Rhea-AI Filing Summary

MPLX LP reported that, on August 25, 2025, the board of managers of MPC Investment LLC, the sole member of MPLX GP LLC, increased the size of the board of directors of the general partner to eleven members and elected Ray N. Walker, Jr. as a director, effective the same day. He is expected to serve on the audit committee and the conflicts committee, which oversee financial reporting and related-party or conflict‑sensitive matters.

As a non‑management director, Mr. Walker will receive compensation in the same manner as the partnership’s other non‑management directors, under terms previously described in MPLX LP’s Annual Report on Form 10‑K for the year ended December 31, 2024.

0001552000false00015520002025-08-252025-08-25

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

_____________________________________________

FORM 8-K

_____________________________________________

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported) August 25, 2025

 _____________________________________________

MPLX LP

(Exact name of registrant as specified in its charter)

_____________________________________________

Delaware

001-35714

27-0005456

(State or other jurisdiction of incorporation)

(Commission File Number)

(IRS Employer Identification No.)

200 E. Hardin Street, Findlay, Ohio 45840

(Address of principal executive offices) (Zip code)

Registrant’s telephone number, including area code: (419) 422-2121

_____________________________________________

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: 

☐			Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
☐			Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
☐			Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
☐			Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:
Title of each class			Trading symbol(s)			Name of each exchange on which registered
Common Units Representing Limited Partnership Interests			MPLX			New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.

☐

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

On August 25, 2025, the board of managers of MPC Investment LLC, the sole member of MPLX GP LLC, the general partner (the “General Partner”), of MPLX LP (the “Partnership”), increased the size of the board of directors of the General Partner (the “Board”) to eleven members and elected Ray N. Walker, Jr. to serve on the Board as a director, effective August 25, 2025. Mr. Walker is expected to serve on the audit committee and conflicts committee of the Board.

As a non-management director, Mr. Walker will receive compensation in the same manner as the Board’s other non-management directors. The terms of non-management director compensation were disclosed in the Partnership’s Annual Report on Form 10-K for the year ended December 31, 2024, filed with the Securities and Exchange Commission on February 27, 2025.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

			MPLX LP
			By:						MPLX GP LLC, its General Partner
Date: August 25, 2025			By:						/s/ Molly R. Benson
									Name: Molly R. Benson
									Title: Chief Legal Officer and Corporate Secretary

FAQ

What board change did MPLX (MPLX) disclose in this 8-K?

MPLX LP disclosed that the board of directors of its general partner was increased to eleven members and that Ray N. Walker, Jr. was elected as a new director effective August 25, 2025.

Who is the new director appointed to MPLX GP LLC's board?

The new director is Ray N. Walker, Jr., who was elected to the board of directors of MPLX GP LLC, the general partner of MPLX LP, effective August 25, 2025.

Which committees will Ray N. Walker, Jr. serve on at MPLX (MPLX)?

Ray N. Walker, Jr. is expected to serve on the audit committee and the conflicts committee of the board of the general partner.

Did MPLX change director compensation with this board appointment?

No changes to compensation were described; the filing states that, as a non‑management director, Mr. Walker will receive compensation in the same manner as the other non‑management directors, under terms previously disclosed in the Form 10‑K for the year ended December 31, 2024.

When did the MPLX board expansion and director appointment take effect?

Both the increase in the size of the board of the general partner to eleven members and the election of Ray N. Walker, Jr. as director were effective on August 25, 2025.

Which entity governs MPLX LP as general partner?

MPLX LP’s general partner is MPLX GP LLC, whose sole member is MPC Investment LLC; the board of this general partner was expanded and now includes Ray N. Walker, Jr. as a director.