Marathon Petroleum Corp

Item 1. Legal Proceedings

We are the subject of, or a party to, a number of pending or threatened legal actions, contingencies and commitments involving a variety of matters, including laws and regulations relating to the environment. While it is possible that an adverse result in one or more of the lawsuits or proceedings in which we are a defendant could be material to us, based upon current information and our experience as a defendant in other matters, we believe that these lawsuits and proceedings, individually or in the aggregate, will not have a material adverse effect on our consolidated results of operations, financial position or cash flows. See “Climate Change Litigation,” “Tesoro High Plains Pipeline,” and “Dakota Access Pipeline” of Note 22 in Item 1. Financial Statements for additional information regarding Legal Proceedings and other regulatory matters.

Item 103 of Regulation S-K promulgated by the SEC requires disclosure of certain environmental matters when a governmental authority is a party to the proceedings and such proceedings involve potential monetary sanctions, unless we reasonably believe that the matter will result in no monetary sanctions, or in monetary sanctions, exclusive of interest and costs, of less than a specified threshold of $1 million for this purpose.

Except as described below, there have been no material changes to the environmental matters previously disclosed in our Annual Report on Form 10-K for the year ended December 31, 2025.

MPC’s Galveston Bay Refinery is subject to a consent decree with the EPA covering various environmental regulatory programs at the refinery. Following a review of the refinery’s compliance with the consent decree, EPA assessed stipulated penalties in the second quarter of 2026 for alleged violations of the consent decree occurring from 2020 through 2024. We believe resolution of the stipulated penalty demand may result in the payment of $1 million or more, but do not believe any stipulated penalties will have a material impact on our consolidated results of operations, financial position or cash flows.