MPC: Leadership change · Other company developments

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers. On October 28, 2026, the Board of Directors (the “Board”) of Marathon Petroleum Corporation (the “Company”) increased the size of the Board to eleven members and elected David E. Constable as a director of the Company, with such increase in the size of the Board and election effective as of March 1, 2027. Mr. Constable was appointed to serve on the Board’s Compensation and Organization Development Committee and Sustainability and Public Policy Committee, also effective March 1, 2027. As a non-employee director, Mr. Constable 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. Item 8.01 Other Events. On October 29, 2026, the Company issued a press release announcing the changes reported above. A copy of the press release is attached as Exhibit 99.1 to this Current Report on Form 8-K. Item 9.01 Financial Statements and Exhibits. (d) Exhibits. Exhibit Number Description 99.1 Press release issued by Marathon Petroleum Corporation on October 29, 2026 104 Cover Page Interactive Data File (embedded within the Inline XBRL document) SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. Marathon Petroleum Corporation Date: October 29, 2026 By: /s/ Molly R. Benson Name: Molly R. Benson Title: Chief Legal Officer and Corporate Secretary