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Marathon Petroleum is a leading integrated downstream and midstream energy company that operates 13 refineries in the Gulf Coast, midcontinent, and West Coast regions of the United States with an aggregate crude oil refining capacity of 3.0 million barrels per day. The company is one of the largest producers of renewable diesel in the US; its Dickinson, North Dakota, facility has the capacity to produce 184 million gallons per year, and its Martinez, California, joint venture facility (a 50/50 partnership with Neste) reached its full capacity of 730 million gallons per year in late 2024. Marathon also owns the general partner and approximately 64% of MPLX LP, a large-cap master limited partnership that owns and operates midstream energy infrastructure and logistics assets.

Shell is an integrated energy company involved in the exploration, production, refining, and marketing of oil and natural gas, as well as the manufacturing and distribution of chemicals. The company operates across several segments, including upstream, integrated gas, downstream, and renewables and energy solutions. Founded in 1907, Shell is headquartered in The Hague, Netherlands, and operates in over 70 countries worldwide. Its strategic strengths include a diversified portfolio with significant investments in liquefied natural gas (LNG) and a growing focus on renewable energy and decarbonization efforts. The company's global presence and extensive supply chain network contribute to its significant competitive positioning in the energy sector.