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MPLX is a partnership that owns both pipelines and gathering and processing assets with extensive holdings in the Appalachian region. The asset base is made up of pipeline assets dropped down from Marathon Petroleum, its sponsor, and gathering and processing assets from MarkWest, which it acquired in 2015. MPLX also acquired Andeavor Logistics in 2019.
Energy Transfer owns one of the largest portfolios of crude oil, natural gas, and natural gas liquid assets in the US, primarily in Texas and the US midcontinent region. Its pipeline network includes more than 12,000 miles of intrastate pipelines and 20,000 miles of interstate pipelines. It also owns gathering, processing, and storage facilities in the largest US oil and gas producing regions. Other businesses include a network of natrual gas liquids and refined products facilities, 18,000 miles of crude oil pipelines, and the Lake Charles gas liquefaction facility. Energy Transfer combined its publicly traded limited and general partnerships in October 2018.