Sunoco, previously known as Sun Company and Sun Oil Co., is a Fortune 100 Company that is among the largest distributors of gasoline in the United States. Sunoco ceased its oil refining operations in 2011 to focus exclusively on distributing gas through its 4700 nationwide locations. Started in 1886 as The Peoples Natural Gas Company, the Pittsburgh, PA business was formed by Edward Emerson, Joseph Newton Pew and Philip Pisano. As of 2011, it was the third largest company in Pennsylvania in terms of revenue, operating in 26 states. Sunoco pioneered the concept of custom blended gasoline that allowed customers to choose from several different octanes of gas, which could be accessed through a single pump.