MPC CEO Maryann Mannen elected Chairman; Michael Hennigan retires as Executive Chairman

Marathon Petroleum Corp

Maryann T. Mannen (president and CEO) elected Chairman of the Board effective Jan 1, 2026, retaining CEO role.
Michael J. Hennigan retires as Executive Chairman and from the Board, effective Jan 1, 2026.
John Surma continues as independent lead director; Board size reduces to 11 directors.
Hennigan served as CEO from March 2020 to August 2024, then Executive Chairman.

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