MPLX elects Maryann T. Mannen as Chairman; Michael J. Hennigan to retire as Executive Chairman effective Jan 1, 2026

MPLX LP

Maryann T. Mannen elected Chairman of MPLX GP board effective Jan 1, 2026, in addition to her CEO role.
Michael J. Hennigan to retire as Executive Chairman and board member effective Jan 1, 2026, reducing board size to 10.
Chris Helms continues as independent lead director.
Hennigan also retiring as executive chairman of MPC (Marathon Petroleum); Mannen to succeed as chairman of MPC effective Jan 1, 2026.

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