Exhibit 99.1 Marathon Petroleum Corp. Reports Second-Quarter 2025 Results FINDLAY, Ohio, Aug 5, 2025 – Marathon Petroleum Corp. (NYSE: MPC) today reported net income attributable to MPC of $1.2 billion, or$3.96 per diluted share, for the second quarter of 2025, compared with net income attributable to MPC of $1.5 billion, or$4.33 per diluted share, for the second quarter of 2024. The second quarter of 2025 adjusted earnings before interest, taxes, depreciation, and amortization (adjusted EBITDA) was $3.3 ...