Marathon Petroleum Corp has announced the appointment of David E. Constable to its Board of Directors, effective March 1, 2027. This strategic move aims to bolster the company's leadership as it navigates the competitive landscape of the petroleum refining industry.

Constable brings over four decades of experience in the energy, chemicals, engineering, and construction sectors. His extensive background includes serving as Chairman and CEO of Fluor Corporation and leading Sasol Ltd. from 2011 to 2016. His expertise is expected to be a significant asset as Marathon Petroleum executes its strategic objectives.

Maryann Mannen, Chairman, President, and CEO of Marathon, expressed optimism about Constable's addition to the board, stating, "We are fortunate to have David joining as a member of our Board of Directors. He will bring over four decades of global leadership experience, a tremendous asset as we execute our strategy."

The Board of Directors will increase to eleven members with Constable's election, reflecting Marathon's commitment to enhancing its governance structure. His appointment is expected to complement the existing board's skills and experience.

Marathon Petroleum, headquartered in Findlay, Ohio, is a leading integrated downstream and midstream energy company. It operates the largest refining system in the United States and has a marketing system that includes branded locations nationwide. The company also holds a significant interest in MPLX LP, a midstream company focused on gathering and processing assets.

The filing, dated October 29, 2026, also included a press release detailing these changes, which is attached as Exhibit 99.1. This announcement comes as the company seeks to strengthen its position in a highly competitive sector.

As the petroleum refining industry continues to evolve, Marathon Petroleum's strategic decisions, including board appointments, will be crucial in determining its future trajectory. The filing does not specify any immediate next steps following this appointment.