MPLX (MPLX) announced that the board of directors of the general partner of MPLX has elected Maryann Mannen, president and chief executive officer and member of the board, as chairman of the board, effective Jan. 1, 2026. Mannen will assume the role of chairman of the board in addition to her current responsibilities. Mannen will succeed Michael 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 Jan. 1, 2026. Chris Helms will continue to serve as the independent lead director of the board. Also announced and effective Jan. 1, 2026, Hennigan will retire as executive chairman of MPC, with Mannen to succeed him as chairman and continuing to lead MPC as its president and CEO.
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