UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

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FORM 8-K

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CURRENT REPORT

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

Date of Report (Date of earliest event reported) ~~March~~April 167, 2026

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MPLX LP

(Exact name of registrant as specified in its charter)

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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

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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:~~

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 51.0201 ~~Departure~~Entry ofinto ~~Directors~~a orMaterial ~~Certain~~Definitive ~~Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers~~Agreement.

On ~~March~~April 167, 2026, MPLX ~~GP LLC (“MPLX GP”)~~LP, ~~the~~a ~~general~~Delaware ~~partner~~master oflimited ~~MPLX~~partnership LP (“MPLX” ~~or the "Partnership"~~), ~~appointed~~entered ~~Erin~~into M.a ~~Brzezinski as Vice President and Controller of MPLX GP, effective April 1, 2026~~$2.5 ~~In this capacity~~billion, ~~Ms.~~five-year ~~Brzezinski~~Revolving will be the Partnership’s principal accounting officer. Ms. Brzezinski will succeed Rebecca L. Iten, who will cease to serve as Vice President and Controller of MPLX GP, effective April 1, 2026, and will continue to serve in an accounting leadership role for the Partnership. This change will align the Partnership’s accounting leadership and operations with Marathon Petroleum Corporation’s (“MPC”) accounting function further strengthening the integration of financial reporting and technical accounting. Ms. Brzezinski currently serves as the principal accounting officer of MPC and will continue to serve in that role. Ms. Brzezinski will functionally report to C. Kristopher Hagedorn, MPLX GP’s Executive Vice President and Chief Financial Officer in her capacity as the MPLX principal accounting officer and will continue reporting to Maria A. Khoury, MPC’s Executive Vice President and Chief Financial Officer in her capacity as the MPC principal accounting officer.

~~Ms.~~Credit ~~Brzezinski,~~Agreement ~~age~~with ~~43,~~Wells ~~has~~Fargo ~~served as the principal accounting officer and Vice President and Controller of MPC since January 2024. Prior to this appointment~~Bank, ~~she~~National ~~served as MPC’s Assistant Controller~~Association, ~~Technical Accounting, since August 2021, having previously served~~ as ~~Manager,~~administrative ~~Accounting~~agent, ~~since~~each ~~2019.~~of ~~Before~~Wells ~~joining~~Fargo ~~MPC~~Securities, ~~Ms. Brzezinski was Director~~LLC, Assurance and Audit Services, at PricewaterhouseCoopers LLP, a professional services and accounting firm, beginning in 2018, and Senior Manager beginning in 2013. She was Manager, Technical Accounting, at Cooper Tire & Rubber Company, an automotive tire manufacturer, from 2011 to 2013. Prior to that, Ms. Brzezinski served in positions of increasing responsibility with PricewaterhouseCoopers LLP beginning in 2004.

~~MPLX~~JPMorgan ~~does~~Chase ~~not~~Bank, ~~directly employ any of the personnel responsible for managing and operating the MPLX business~~N. ~~Rather~~A., ~~MPLX~~Barclays ~~contracts~~Bank ~~with~~PLC, ~~MPC~~BofA ~~to provide the necessary personnel~~Securities, ~~all of whom are directly employed by MPC or one of its wholly owned subsidiaries~~Inc., Ms. Brzezinski will continue to receive an annual base salary from MPC and participate in MPC’s annual cash bonus ("ACB") and long-term incentive ("LTI") programs. Descriptions of the ACB and LTI programs are included in MPLX’s Annual Report on Form 10-K for the year ended December 31Citibank, ~~2025 (the "2025 10-K")~~N. MsA. ~~Brzezinski will also continue to be eligible to participate in MPC’s other benefit plans and programs such as health and life insurance~~, ~~income~~Goldman ~~protection~~Sachs inBanks ~~a circumstance of long-term and short-term disability~~USA, ~~and~~Mizuho ~~retirement and severance benefits plans, descriptions of which are included in the 2025 10-K.~~

~~Other than with respect to the compensation matters described above~~Bank, ~~there are no arrangements or understandings between Ms~~Ltd., ~~Brzezinski~~MUFG ~~and~~Bank, ~~any other persons pursuant to which Ms~~Ltd., ~~Brzezinski~~RBC ~~was~~Capital ~~appointed~~Markets, Sumitomo ~~the~~Mitsui ~~principal~~Banking ~~accounting~~Corporation ~~officer of MPLX. There are no family relationships between Ms. Brzezinski~~ and ~~any~~TD ~~director~~Securities or(USA) ~~executive~~LLC, ~~officer~~as ~~of MPLX.~~

joint lead arrangers and joint bookrunners, JPMorgan Chase Bank, N.A., as syndication agent, each of Bank of America, N.A.,

Barclays Bank PLC, Citibank, N.A., Goldman Sachs Bank USA, Mizuho Bank, Ltd., MUFG Bank, Ltd., Royal Bank of Canada,

Sumitomo Mitsui Banking Corporation and The Toronto-Dominion Bank, New York Branch, as documentation agents, and the

other lenders and issuing banks that are parties thereto (the “New MPLX Credit Agreement”).

The New MPLX Credit Agreement replaces the previously effective 2022 Credit Agreement (as defined below) and is intended to

be used for general partnership purposes. There were no borrowings outstanding under the 2022 Credit Agreement at the time of

its termination, and as of the date hereof, there are no borrowings outstanding under the New MPLX Credit Agreement. As of

March 31, 2026, MPLX had $1.5 billion of cash and cash equivalents.

The New MPLX Credit Agreement provides for a $2.5 billion unsecured revolving credit facility that matures on April 7, 2031.

MPLX has an option to increase the aggregate commitments by up to an additional $1.0 billion, subject to, among other

conditions, the consent of the lenders whose commitments would be increased. In addition, MPLX may request up to two one-

year extensions of the maturity date of the New MPLX Credit Agreement subject to, among other conditions, the consent of

lenders holding a majority of the commitments, provided that the commitments of any non-consenting lenders will terminate on

the then-effective maturity date. The New MPLX Credit Agreement includes sub-facilities for swing-line loans of up to $150.0

million and letters of credit of up to $150.0 million (which may be increased to up to $200.0 million upon receipt of additional letter

of credit issuing commitments).

Commitment fees ranging from 10.0 basis points to 25.0 basis points per annum, depending on MPLX’s credit ratings, accrue on

the unused commitments under the New MPLX Credit Agreement. Borrowings under the New MPLX Credit Agreement bear

interest, at MPLX’s election, at either (i) the Adjusted Term SOFR (as defined in the New MPLX Credit Agreement) plus a margin

ranging from 100.0 basis points to 175.0 basis points per annum, depending on MPLX’s credit ratings or (ii) the Alternate Base

Rate (as defined in the New MPLX Credit Agreement) plus a margin ranging from 0.0 basis points to 75.0 basis points per

annum, depending on MPLX’s credit ratings.

The New MPLX Credit Agreement contains representations and warranties, affirmative and negative covenants and events of

default that MPLX considers customary for an agreement of its nature and type, including a covenant that requires MPLX’s ratio

of Consolidated Total Debt (as defined in the New MPLX Credit Agreement) to Consolidated EBITDA (as defined in the New

MPLX Credit Agreement) for the four prior fiscal quarters not to exceed 5.0 to 1.0 as of the last day of each fiscal quarter (or 5.5

to 1.0 during an Acquisition Period (as defined in the New MPLX Credit Agreement)). Consolidated EBITDA is subject to

adjustments for certain acquisitions completed and capital projects undertaken during the relevant period. In addition to

commitment fees and interest charges, MPLX agreed to pay administrative fees, letter of credit fronting fees and other customary

fees and to reimburse certain expenses of the lenders and agents incurred in connection with the New MPLX Credit Agreement.

Certain parties to the New MPLX Credit Agreement have in the past performed, and may in the future from time to time perform,

investment banking, financial advisory, lending or commercial banking services for MPLX and its subsidiaries and affiliates, for

which they have received, and may in the future receive, customary compensation and reimbursement of expenses.

The above description of the material terms and conditions of the New MPLX Credit Agreement does not purport to be complete

and is qualified in its entirety by reference to the full text of such agreement, which is filed as Exhibit 10.1 hereto and

incorporated by reference herein.


Item 1.02	Termination of a Material Definitive Agreement.

The New MPLX Credit Agreement replaced MPLX’s previously existing $2.0 billion credit agreement, dated as of July 7, 2022

(the “2022 Credit Agreement”), by and among MPLX, Wells Fargo Bank, National Association, as administrative agent, and the

various other commercial lending institutions that were party thereto. The 2022 Credit Agreement was terminated in connection

with and as a condition to the availability of the lending and credit commitments under the New MPLX Credit Agreement. A

summary of the material terms of the 2022 Credit Agreement may be found in the Current Report on Form 8-K filed by MPLX on

July 12, 2022, which summary is incorporated herein by reference.


Item 2.02	Results of Operations and Financial Condition.

The information set forth in Item 1.01 of this Current Report on Form 8-K with respect to MPLX’s preliminary estimate of its cash

and cash equivalents as of March 31, 2026, is incorporated herein by reference. Such information is unaudited and preliminary

and does not present all information necessary for an understanding of the MPLX’s results of operations for the quarter ended

March 31, 2026.

Information in this Item 2.02 shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934,

as amended (the “ Exchange Act ”), or otherwise incorporated by reference into any filing pursuant to the Securities Act of 1933,

as amended, or the Exchange Act except as otherwise expressly stated in such a filing.


Item 2.03	Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.

The information in Item 1.01 of this Current Report on Form 8-K is incorporated herein by reference.


Item 9.01	Financial Statements and Exhibits.

(d) Exhibits.


Exhibit Number		Description


10.1#		Revolving Credit Agreement, dated as of April 7, 2026, by and among MPLX LP, as borrower, Wells Fargo Bank, National Association, as administrative agent, each of Wells Fargo Securities, LLC, JPMorgan Chase Bank, N.A., Barclays Bank PLC, BofA Securities, Inc., Citibank, N.A., Goldman Sachs Bank USA, Mizuho Bank, Ltd., MUFG Bank, Ltd., RBC Capital Markets, Sumitomo Mitsui Banking Corporation and TD Securities (USA) LLC, as joint lead arrangers and joint bookrunners, JPMorgan Chase Bank, N.A., as syndication agent, each of Bank of America, N.A., Barclays Bank PLC, Citibank, N.A., Goldman Sachs Bank USA, Mizuho Bank, Ltd., MUFG Bank, Ltd., Royal Bank of Canada, Sumitomo Mitsui Banking Corporation and The Toronto-Dominion Bank, New York Branch, as documentation agents, and the other lenders and issuing banks that are parties thereto
104		Cover Page Interactive Data File (embedded within the Inline XBRL document)

# Certain exhibits and schedules have been omitted pursuant to Item 601(a)(5) of Regulation S-K. A copy of any omitted

schedule or exhibit will be furnished to the Securities and Exchange Commission upon request.

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: March 18, 2026	By:	/s/ Molly R. Benson
		Name: Molly R. Benson
		Title: Chief Legal Officer and Corporate Secretary

its behalf by the undersigned hereunto duly authorized.


	MPLX LP

	By:	MPLX GP LLC, its General Partner


Date: April 13, 2026	By:	/s/ Molly R. Benson
		Name: Molly R. Benson
		Title: Chief Legal Officer and Corporate Secretary

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