MPLX LP on November 4, 2025 announced that the board of directors of the general partner of MPLX has elected Maryann T. Mannen, president and chief executive officer and member of the board, as chairman of the board, effective January 1, 2026. Mannen will assume the role of chairman of the board in addition to her current responsibilities. Mannen will succeed Michael J. Hennigan, who has elected to retire as executive chairman and as a member of the board of directors of the general partner of MPLX, also effective January 1, 2026.
Chris Helms will continue to serve as the independent lead director of the board. Mr. Hennigan has led the general partner of MPLX as chairman of the board of directors since April 2020, as CEO from November 2019 to August 2024, and as President from June 2017 to August 2024. Ms. Mannen has served as CEO since August 2024 and as a member of the board of directors since February 2021.

















