Marathon Petroleum Corp. Appoints Maryann T. Mannen as New Chairman of the Board

Marathon Petroleum Corp. Appoints Maryann T. Mannen as Chairman of the Board

On November 4, 2025, Marathon Petroleum Corporation (NYSE: MPC) announced a significant leadership transition within its board. Effective January 1, 2026, Maryann T. Mannen, who currently holds the roles of President and CEO, will step into the position of Chairman of the Board, taking over the role from Michael J. Hennigan. This marks an important milestone for the company, as Mannen continues to steer its vision and operations following a period marked by substantial growth and value creation.

Mannen's elevation to Chairman is coupled with recognition of Hennigan's dedicated service during a critical time for MPC. Under his leadership, the company not only stabilized its operations but also thrived, demonstrating resilience in a competitive market. In a statement, John Surma, the Independent Lead Director of the board, expressed confidence in Mannen’s capabilities, emphasizing the board's enthusiasm for the future under her leadership. “We congratulate Maryann as our new chairman of the board,” said Surma. “We are confident in Maryann's leadership and enthusiastic about our company's direction.”

Reflecting on her new responsibilities, Mannen articulated her commitment to build upon Hennigan's legacy. “It’s an honor to succeed Mike as chairman of the board and to have the opportunity to build on that legacy of leadership and success,” she said. Mannen aims to elevate the company’s performance further as it navigates the evolving landscape of the energy sector.

The transition comes after Hennigan's departure as executive chairman, a role he transitioned to from his previous position as CEO in August 2024. Mannen has been instrumental in guiding the company’s strategic initiatives since her appointment as CEO in August 2024, after previously serving as president and chief financial officer.

Marathon Petroleum is recognized as a leading integrated downstream and midstream energy company, headquartered in Findlay, Ohio. It operates the largest refining system in the nation and markets its products through a vast network of branded retail locations across the United States, including the well-known Marathon brand outlets. Additionally, the company holds a significant stake in MPLX LP, a midstream company involved in various energy-related operations such as crude oil and product transportation, gathering, and processing.

Looking ahead, Mannen is set to enhance Marathon Petroleum’s strategic goals and operational efficiency. Her comprehensive understanding of the energy sector and the intricacies of corporate governance positions her well to lead the company through its next phase of growth.

As the energy landscape evolves with new challenges and opportunities, the leadership transition at Marathon Petroleum signifies a promising direction. Mannen's experience and vision are anticipated to play a pivotal role in driving the company forward as it adapts to market dynamics while continuing to uphold its commitment to excellence in the energy sector.