Exhibit 99.1 Marathon Petroleum Corp. Reports First-Quarter 2024 Results • First-quarter net income attributable to MPC of $937 million, or$2.58 per diluted share; adjusted EBITDA of $3.3 billion • Net cash provided by operating activities of$1.5 billion; safely and successfully completed largest planned maintenance quarter in MPC history, including at four of its largest refineries • Advanced midstream growth strategy, with new processing plants in the Marcellus and Permian basins and acquisition of Utic ...