MPLX LP Expands Board to 12 Members with Appointment of Two New Directors

Executive Summary

On October 27, 2026, the board of managers of MPC Investment LLC—the sole member of MPLX GP LLC, the general partner of MPLX LP (NYSE: MPLX)—approved an expansion of the Board of Directors from 10 to 12 members. Concurrently, Micheal G. Dunn and Bruce L. Niemeyer were elected to fill the newly created directorships, effective November 1, 2026.

Key Appointments & Committee Assignments

• Micheal G. Dunn: Appointed as director, effective November 1, 2026. Named to the Audit Committee and Conflicts Committee.
  • Background: Over 35 years of natural gas and midstream industry experience. Most recently served as Executive Vice President and Chief Operating Officer of The Williams Companies until his retirement in 2025. Previously held executive roles at Kern River Gas, PacifiCorp Energy, and Questar Corporation.
• Bruce L. Niemeyer: Appointed as director, effective November 1, 2026. Named to the Audit Committee and Conflicts Committee.
  • Background: Over 40 years of energy industry experience. Former President of Americas Exploration & Production at Chevron, and former Corporate Vice President of Strategy and Sustainability at Chevron.

Compensation Details

Both appointees will serve as non-management directors and will receive compensation consistent with the standard non-management director compensation program described in MPLX LP's Annual Report on Form 10-K for the fiscal year ended December 31, 2025.

Market & Governance Impact

• Trading Significance: Low. This is a standard corporate governance update expanding board capacity and adding relevant industry and operational expertise.
• Strategic Value: Dunn and Niemeyer add extensive operational, midstream, and upstream leadership depth to the general partner's board, specifically strengthening governance through assignments on the Audit and Conflicts Committees.