Marathon Petroleum Corporation operates the nation's largest refining system, processing approximately 3 million barrels per day of crude oil across 13 refineries. Founded in 1887 as The Ohio Oil Company in Lima, Ohio, the company has evolved into a leading integrated downstream and midstream energy company headquartered in Findlay, Ohio. Its operations span refining, fuel marketing through Marathon-branded retail outlets coast to coast, and midstream infrastructure including terminals and pipelines. The company owns the general partner and majority limited partner interest in MPLX LP, which handles gathering, processing, and transportation infrastructure.
The technical environment supporting this scale of operations presents significant attack surface across operational technology and enterprise systems. Refining operations require constant coordination between process control systems, safety instrumentation, and terminal automation - environments where availability and integrity failures carry physical consequences. With 13 refineries, nationwide pipeline networks, and thousands of retail endpoints, the threat model includes everything from ransomware targeting refinery control systems to supply chain compromises in fuel distribution networks. The company's core values emphasize operational safety and environmental stewardship, domains where cybersecurity directly intersects with regulatory compliance and incident response.
Security teams at this scale work across industrial control systems, SCADA networks, pipeline monitoring infrastructure, and traditional enterprise IT - requiring expertise in both OT security and modern cloud architectures. The company's stated commitment to integrity and responsible operations translates to security requirements that span physical safety systems, environmental monitoring, and business continuity across critical energy infrastructure. Leadership under CEO Maryann T. Mannen oversees operations that keep energy moving through a network spanning refineries, terminals, pipelines, and retail locations nationwide.