Amendment to Credit Agreement

Delek US Holdings, Inc. has entered into Amendment No. 4 to its Third Amended and Restated Credit Agreement. This amendment, dated April 9, 2026, increases the revolving loan commitments from $1.1 billion to $1.25 billion and extends the maturity date of the Revolving Facility from October 26, 2027, to April 9, 2031. It also reduces interest rate margins by 0.25% and modifies certain covenants and reporting requirements. The amendment allows for potential increases in revolving borrowings up to $750 million, or a percentage of EBITDA, subject to certain conditions. The agreement includes customary affirmative and negative covenants and is secured by a first priority lien on substantially all tangible and intangible assets of the Company. DK Canada Energy ULC has been released as a Guarantor under the Credit Agreement.