Investor Information


MPLX LP (MPLX) is a publicly traded master limited partnership formed by MPC to own, operate, develop and acquire pipelines and other midstream assets related to the transportation and storage of crude oil, refined products and other hydrocarbon-based products.

In 2015, MPLX merged with MarkWest, whereby MarkWest became a wholly owned subsidiary of MPLX. MarkWest is one of the largest processors of natural gas in the U.S. and the largest processor and fractionator in the Marcellus and Utica shale plays. The company’s midstream energy operations include: natural gas gathering, processing and transportation; NGL gathering, transportation, fractionation, storage and marketing; and crude oil and refined products transportation and storage. Its integrated midstream energy asset network links producers of natural gas, natural gas liquids and crude oil from some of the largest supply basins in the United States to domestic and international markets.

Through the MarkWest combination, MPLX assets include approximately 5,400 million cf/d of gathering capacity, 7,100 million cf/d of natural gas processing capacity, and 500 mbpd of NGL fractionation capacity and more than 5,000 miles of gas gathering and NGL pipelines. MPLX assets also include 100 percent ownership of common carrier pipeline systems through Marathon Pipe Line LLC (MPL) and Ohio River Pipe Line LLC (ORPL), and a 1 million barrel butane storage cavern in West Virginia. MPLX, through MPL and ORPL, owns, leases and operates 1,008 miles of common carrier crude oil lines and 1,900 miles of common carrier products lines located in nine states as well as four tank farms in Illinois and Indiana with available storage capacity of 4.53 million barrels that is committed to MPC.

MPLX’s inland Marine operations include 18 owned towboats and one leased towboat and a fleet of 205 owned and 14 leased barges. All cargoes transported are liquid and include, among other commodities, crude oil, asphalt, gasoline, diesel fuel, vacuum gas oil, condensate, feedstocks, chemicals and ethanol.

Marathon Petroleum Corporation Profile

Marathon Petroleum Corporation

Marathon Petroleum Corporation (MPC) is the nation’s fourth-largest refiner. With geographically and strategically aligned operations across the entire downstream value chain, MPC is an industry leader emphasizing safe and reliable operations. The company’s extensive transportation and distribution assets and operations are distinguishing factors that separate it from other refining and marketing companies. This extensive logistical system allows MPC to optimize the supply of crude oil and other feedstocks into its approximately 1.8 million barrels per calendar day crude oil refining system and the distribution of refined products produced in these refineries.

MPC markets through two strong retail brand names: Speedway® and Marathon®. Speedway LLC owns and operates the nation’s second-largest convenience store chain, with approximately 2,770 locations in 22 states.

The Marathon brand is an established motor fuel brand in the Midwest and Southeast regions of the U.S., and is available through approximately 5,500 independently owned and operated retail outlets in 19 states. There are approximately 300 retail outlet contract assignments primarily in the Southeast and select Northeast states. Through these brands and our wholesale business, MPC is a significant supplier in its market area.

MPC serves the Midwest, Northeast, East Coast, Southeast, and Gulf Coast as a petroleum products marketer, with 79 owned and operated light product and asphalt terminals. MPC owns, leases or has ownership interests in about 8,400 miles of pipeline. 

With a long history dating back to the earliest years of the oil industry, MPC and its nearly 45,440 employees are focused on delivering value to our stakeholders and customers and look forward to continued success.