What company was broken up by a 1911 U.S. Supreme Court antitrust ruling?

Standard Oil was broken up by a 1911 U.S. Supreme Court antitrust ruling.

The court found that the Standard Oil Trust violated the Sherman Antitrust Act and ordered its dissolution. The decision divided the company into 34 separate businesses, ending John D. Rockefeller’s highly integrated corporate structure.

Several successor companies later became major international oil corporations. Standard Oil of New Jersey became Esso and eventually Exxon, while Standard Oil of New York became Socony and later Mobil. Other descendants included Chevron and Amoco.

The ruling did not end large-scale oil production or refining. Instead, it changed ownership and competition in the industry. The case is often confused with the earlier creation of the Standard Oil trust in the 1880s, but the breakup occurred in 1911.