Standard Oil Standard Oil Standard Oil Co. Inc. was an American oil producing, transporting, refining, and marketing company. Established in 1870 by John D. Rockefeller and Henry Flagler as a corporation in Ohio, it was the largest oil refinery in the world of its time. Its history as one of the world's first and largest multinational corporations ended in 1911, when the United States Supreme Court, in a landmark case, ruled that Standard Oil was an illegal monopoly. Standard Oil dominated the oil products market initially through horizontal integration in the refining sector, then, in later years vertical integration; the company was
Standard Oil Co. of New Jersey v. United States significant constraint on competition by mere virtue of their size and market power, as implied by the Antitrust Act. Over a period of decades, the Standard Oil Company of New Jersey had bought up virtually all of the oil refining companies in the United States. Initially, the growth of Standard Oil was driven by superior refining technology and consistency in the kerosene products (i.e., product standardization) that were the main use of oil in the early decades of the company's existence. The management of Standard Oil then reinvested their profits in the acquisition of most of the refining capacity in