About Us

MarkWest, a wholly owned subsidiary of MPLX LP (NYSE: MPLX), is engaged in the gathering, processing, and transportation of natural gas; the transportation, fractionation, storage and marketing of NGLs; and the gathering and transportation of crude oil. Learn More »


Southwest »
Extensive suite of top-tier midstream assets throughout liquids-rich resource plays

Northeast »
Largest processor and fractionator in the southern Appalachian Basin with over 25 years experience marketing NGLs throughout the region

Marcellus »
Six major complexes in the liquids-rich Marcellus Shale, the nation’s most productive resource play

Utica »
Largest full-service midstream system in the heart of the Utica Shale

FERC Pipelines »