Sinclair Oil Corporation is an American petroleum corporation, founded by Harry F. Sinclair on May 1, 1916, as the Sinclair Oil and Refining Corporation by combining the assets of 11 small petroleum companies. Originally a New York corporation, Sinclair Oil reincorporated in Wyoming in 1976. The corporation’s logo features the silhouette of a large green dinosaur. It is ranked on the list of largest privately owned American corporations. It owns and operates refineries, gas stations, hotels, a ski resort, and a cattle ranch.