Marathon Petroleum Corporation is a leading American oil refining, marketing, and transportation company. Founded in 1887, it operates one of the largest refining systems in the United States, with a capacity of over 3 million barrels per day. The company is involved in the production of gasoline, diesel, and other petroleum products, serving both retail and wholesale markets. In addition to refining, Marathon Petroleum also has a significant presence in the midstream sector, which includes the transportation and storage of crude oil and refined products. The company owns and operates a vast network of pipelines and terminals, ensuring efficient distribution across the country.