No, Standard Oil is no longer owned by the Rockefeller family, nor does the corporate entity exist in its original consolidated form. In 1911, the United States Supreme Court ruled that Standard Oil constituted an illegal monopoly under antitrust laws, resulting in its historic breakup into dozens of independent successor companies. These separate corporate entities—such as Exxon, Mobil, Chevron, and Amoco—subsequently evolved independently through decades of mergers, acquisitions, and public stock trading, completely severing any unified family ownership or control.