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 Oil insist that the company did not restrain trade; they were simply superior competitors. The federal courts ruled otherwise. Some economic historians have observed that Standard Oil was in the process of losing its monopoly at the time of its breakup in 1911. Although Standard had 90 percent of American refining capacity in 1880, by 1911 that had shrunk to between 60 and 65 percent, due to the expansion in capacity by competitors. Numerous regional competitors (such as Pure Oil in the East, Texaco and Gulf Oil in the Gulf Coast, Cities Service and Sun in the Midcontinent, Union in