Exhibit 99.1 Delek US Holdings Reports Second Quarter 2025 Results BRENTWOOD, Tenn.-- August 6, 2025 -- Delek US Holdings, Inc. (NYSE: DK) ("Delek US", "Company") today announced financial results for its second quarter ended June 30, 2025. "We continue to make progress in achieving our Sum of the Parts goals and improving the overall profitability of the company by achieving our original $120 million EOP target one quarter in advance," said Avigal Soreq, President and Chief Executive Officer of Delek US. " ...