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MPLX is a diversified, growth-oriented master limited partnership formed in 2012 by MPC to own, operate, develop and acquire midstream energy infrastructure assets. In 2015, MPLX merged with MarkWest, whereby MarkWest became a wholly owned subsidiary of MPLX. 

MPLX provides services in the midstream sector across the hydrocarbon value chain through its Gathering and Processing and Logistics and Storage segments.

Gathering and Processing

MPLX operates several natural gas gathering systems in six states. The scope of gathering services provided depends on the composition of the raw or untreated gas at producer customers’ wellheads. MPLX’s natural gas processing complexes remove the heavier and more valuable hydrocarbon components from natural gas. MPLX currently operates natural gas processing complexes in the Marcellus Shale, Utica Shale, Appalachia region, and Southwest region.

Once natural gas has been processed at a natural gas processing complex, the heavier and more valuable hydrocarbon components, which have been extracted as a mixed NGL stream, can be further separated into their component parts through the process of fractionation. MPLX operates NGL gathering systems and NGL fractionation facilities.

Logistics and Storage

MPLX transports and stores crude oil, refined products and other hydrocarbon-based products through a network of common carrier crude oil and product pipeline systems; a butane cavern; tank farms; inland marine towboats and barges; and a barge dock facility, all located in the Midwest and Gulf Coast regions of the United States. MPLX also operates additional crude oil and product pipelines owned by MPC and third parties


MPLX Fact Sheet

  2016 MPLX Fact Sheet (PDF 100 kB)