MPLX LP is a subsidiary of Marathon Petroleum Corporation and operates midstream energy infrastructure and logistics assets in the United States. The company's two segments, Logistics and Storage and Gathering and Processing, are involved in various aspects of natural gas, natural gas liquids, crude oil, and other hydrocarbon-based products. MPLX LP also engages in inland marine transportation, fuel distribution, refining logistics, facility operations, and terminal facilities for refined petroleum products.