Personal wealth note: Equibles reports source-backed professional activity and disclosed compensation; it does not estimate personal net worth.
About Maryann T. Mannen
Maryann T. Mannen is recorded as Chairman, CEO and Board Member at Mplx LP (MPLX). Mplx LP reported in an 8-K filed November 4, 2025 that Maryann T. Mannen was appointed Chairman of the Board, effective January 1, 2026. Mplx LP reported in an 8-K filed May 13, 2024 that Maryann T. Mannen was appointed President and Chief Executive Officer, effective August 1, 2024. Maryann T. Mannen has spoken on 1 earnings call across 1 company, most recently for Mplx LP on August 4, 2026.
“On October 29, 2025, the board of directors of MPLX GP LLC ("MPLX GP"), the general partner of MPLX LP (the "Partnership"), elected Maryann T. Mannen, President and Chief Executive Officer, and member of the board of directors of MPLX GP, as Chairman of the Board, effective as of January 1, 2026 (the "Effective Date").”
“On May 11, 2024, the board of directors of MPLX GP LLC ("MPLX GP"), the general partner of MPLX LP ("MPLX" or the "Partnership"), appointed Maryann T. Mannen as President and Chief Executive Officer, effective August 1, 2024.”
