Marathon Petroleum Corporation was formed on November 9, 2009, as a subsidiary of Marathon Oil.
Marathon Oil, the company's former parent, dates back to 1887 when several small oil companies in Ohio banded together to form The Ohio Oil Company. In 1889, it was purchased by John D. Rockefeller's Standard Oil. It remained a part of Standard Oil until the Standard Oil Trust was broken in 1911. In 1930, The Ohio Oil Company bought the Transcontinental Oil Company and established the "Marathon" brand name. In 1962, the company changed its name to "Marathon Oil Company". From 1982 until 2002, Marathon Oil was a subsidiary of U.S. Steel.
In 2011, Marathon Oil announced the spin-off of its downstream refining and marketing assets to a separate company called Marathon Petroleum Corporation.
Following its acquisition of Andeavor on October 1, 2018, Marathon Petroleum became the largest petroleum refinery operator in the United States, with 16 refineries and over 3 million barrels per day of refining capacity. Marathon Petroleum ranked No. 41 on the 2018 Fortune 500 list of the largest United States corporations by total revenue.
In the 2020 Forbes Global 2000, Marathon Petroleum was ranked as the 197th -largest public company in the world. The company owns 16 refineries with a total crude oil throughput of 2,913,900 barrels per calendar day
Marathon Petroleum's marketing system includes branded locations across the United States, including Marathon branded outlets. MPC also owns the general partner and majority limited partner interest in MPLX LP, a midstream company that owns and operates gathering, processing, and fractionation assets, as well as crude oil and light product transportation and logistics infrastructure.
According to en.wikipedia