Atlantic Petroleum was an oil company in the Eastern United States headquartered in Philadelphia, Pennsylvania, and a direct descendant of the Standard Oil Trust. It was also one of the companies that merged with Richfield Oil Corporation to form the "AtlanticRichfield Co.", later known as ARCO. After an unsuccessful spinoff from ARCO, Atlantic was acquired by Sunoco in 1988. The remainder of ARCO was later acquired by BP, but BP later sold most of Arco's retail assets and brand name were sold to Tesoro, renamed 'Andeavor' in 2017. The Arco brand is now owned by Marathon Petroleum.