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Marathon Petroleum Corp. Elects Maryann T. Mannen as Chairman of the Board

  • Marathon Petroleum Corp. (NYSE: MPC) announced that the board elected Maryann T. Mannen as chairman of the board effective Jan. 1, 2026.
  • Mannen will hold the chairman role in addition to her current responsibilities as president, chief executive officer, & board member.
  • Michael J. Hennigan will retire as executive chairman & board member on Jan. 1, 2026, to be succeeded by Mannen.
  • John Surma will continue serving as independent lead director of the board.
  • Hennigan led MPC as CEO from March 2020, transitioning to executive chairman in August 2024.
  • Mannen became CEO in August 2024 after serving as president since January 2024 & executive vice president & CFO from January 2021 to January 2024.
  • MPC operates the nation's largest refining system & includes branded retail outlets across the United States.
  • The company owns the general partner & majority limited partner interest in MPLX LP, which manages midstream gathering, processing, & transportation assets.