Delek US Holdings, Inc.

In the ordinary conduct of our business, we are from time to time subject to lawsuits, investigations and claims, including environmental claims and employee-related matters. Although we cannot predict with certainty the ultimate resolution of lawsuits, investigations and claims asserted against us, including civil penalties or other enforcement actions, we do not believe that any currently pending legal proceeding or proceedings to which we are a party will have a material adverse effect on our business, financial condition or results of operations. See Note 13 to our condensed consolidated financial statements in Item 1. Financial Statements, of this Quarterly Report on Form 10-Q for further information.

Delek is pursuing litigation against the EPA based on its August 2025 small refinery exemption decisions. In September 2025, our subsidiary Alon Refining Krotz Springs, Inc. filed suit in the United States Court of Appeals for the District of Columbia Circuit (the “D.C. Court of Appeals”) (case no. 25-1180) seeking review of the EPA’s decision that the refinery was ineligible for an exemption for the 2024 compliance year. Then, in October 2025, our subsidiaries Alon Refining Krotz Springs, Inc., Delek Refining, Ltd., Lion Oil Company, LLC and Alon USA, LP filed suit in the D.C. Court of Appeals (case numbers 25-1229, 1230, 1231, 1245) seeking review of the EPA’s decision to refund expired RINs for the 2019 to 2023 compliance years. Separately, in October 2025, Alon USA, LP filed suit in the 5th Circuit Court of Appeals (No. 25-60584) with a protective petition filed in the D.C. Court of Appeals (case no. 25-1246) seeking review of the EPA’s decision denying an exemption on the 2020 exemption petition of the Big Spring Refinery.

Aside from the matters discussed above and disclosure updated in Note 13, there have been no material developments to the proceedings previously reported in our Annual Report on Form 10-K filed on February 26, 2025.