Item 8.01 Other Events.

MPLX LP (the "Issuer") is filing herewith the following exhibits to its Registration Statement on Form S-3 (Registration No. 333-248443):

1. Underwriting Agreement, dated as of March 10, 2022, by and among the Issuer,

MPLX GP LLC, the general partner of the Issuer, and each of Citigroup Global
    Markets Inc., RBC Capital Markets, LLC and TD Securities (USA) LLC, acting as
    representatives of the several underwriters named therein;

2. Twenty-Fifth Supplemental Indenture, dated as of March 14, 2022, by and


    between the Issuer and The Bank of New York Mellon Trust Company, N.A., as
    Trustee (including Form of Note); and



3. Opinion of Jones Day.

Item 9.01 Financial Statements and Exhibits.




(d) Exhibits.

Exhibit
Number                                    Description

 1.1           Underwriting Agreement, dated as of March 10, 2022, by and among the
             Issuer, MPLX GP LLC, the general partner of the Issuer, and each of
             Citigroup Global Markets Inc., RBC Capital Markets, LLC and TD
             Securities (USA) LLC, acting as representatives of the several
             underwriters named therein

 4.1           Twenty-Fifth Supplemental Indenture, dated as of March 14, 2022, by
             and between the Issuer and The Bank of New York Mellon Trust Company,
             N.A., as Trustee (including Form of Note)

 5.1           Opinion of Jones Day

23.1           Consent of Jones Day (included in Exhibit 5.1)

104          Cover Page Interactive Data File (embedded within the Inline XBRL
             document)

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