Marathon Petroleum Corporation filed a Form 8-K on October 29, 2026, disclosing that its Board of Directors elected David E. Constable as a new director, effective March 1, 2027, and expanded the Board from ten to eleven members.

Key Highlights

  • Board expansion: The Board of Directors increased its size to eleven members, effective March 1, 2027.
  • New director elected: David E. Constable was elected to the Board, also effective March 1, 2027.
  • Committee appointments: Mr. Constable was appointed to the Compensation and Organization Development Committee and the Sustainability and Public Policy Committee, both effective March 1, 2027.
  • Compensation terms: As a non-employee director, Mr. Constable will receive the same compensation as other non-employee directors, as described in the company's definitive proxy statement on Schedule 14A filed March 16, 2026.
  • Press release issued: The company issued a press release on October 29, 2026, announcing these changes, attached as Exhibit 99.1.

David Constable Joins Marathon Petroleum Board in March 2027

According to the filing, Marathon Petroleum Corporation's Board of Directors took action on October 28, 2026, to increase the size of the Board from ten to eleven members and to elect David E. Constable as a director. Both actions are set to take effect on March 1, 2027. The filing was made under Item 5.02, covering the departure of directors or certain officers, or the election and appointment of directors and certain officers.

The filing discloses that Mr. Constable was assigned to two Board committees upon his election: the Compensation and Organization Development Committee and the Sustainability and Public Policy Committee. These appointments are also effective March 1, 2027. No further biographical detail about Mr. Constable is included in the body of the filing itself.

Regarding compensation, the filing states that Mr. Constable, as a non-employee director, "will receive the same compensation as the Company's other non-employee directors, as described in the Company's definitive proxy statement on Schedule 14A, filed with the Securities and Exchange Commission on March 16, 2026." Marathon Petroleum Corporation's common stock is listed on the New York Stock Exchange under the trading symbol NYSE:MPC. The report was signed by Molly R. Benson, Chief Legal Officer and Corporate Secretary.

What Was Disclosed

Marathon Petroleum disclosed the election of David E. Constable to its Board of Directors, an expansion of the Board to eleven members, two committee assignments for Mr. Constable, and his compensation terms as a non-employee director, all effective March 1, 2027.