What was the name of Rockefeller's business?

Rockefeller's primary business was the Standard Oil Company, which he co-founded in 1870. The company grew to dominate the oil industry in the United States and became a symbol of monopolistic practices during the late 19th and early 20th centuries. Standard Oil was eventually broken up into several smaller companies by the U.S. Supreme Court in 1911 due to antitrust violations.