Maryann T. Mannen is recorded as Chairman at Mplx LP (MPLX) since January 1, 2026, CEO at Mplx LP (MPLX) since August 1, 2024 and Board Member at Mplx LP (MPLX) since February 1, 2021. 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. Mplx LP is classified in the Oil & Gas Midstream industry within the Energy sector. Other leadership on record at Mplx LP includes Michael J. Hennigan (Chairman), C. Kristopher Hagedorn (CFO and Board Member), John J. Quaid (CFO and Board Member) and 7 others.
“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.”
“Our second quarter results reflect the consistent execution of our strategic priorities. MPLX delivered $1.8 billion of adjusted EBITDA in the second quarter, A 5% increase versus the same period last year, more than overcoming the divestiture of the Rockies assets in late 2025.”
