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

On February 1, 2021, 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 appointed Maryann T. Mannen to serve on the Board as a director, effective February 1, 2021. Ms. Mannen is not expected to serve on any standing committees of the Board.

Ms. Mannen currently serves as the Executive Vice President and Chief Financial Officer of Marathon Petroleum Corporation ("MPC") which owns the general partner and majority limited partnership interest in the Partnership. Accordingly, Ms. Mannen will not receive compensation for her services as a member of the Board.

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