Founded by Emory T. Clark in 1932 as a single filling station on the corner of 60th St. and Greenfield Ave. in West Allis, Wisconsin, Clark Super Gas sold only premium gasoline.

By the mid-1950s, the company operated nearly 500 gas stations throughout the Midwest, with locations in California, Florida, Illinois, Indiana, Iowa, Michigan, Minnesota, Missouri, Ohio and Wisconsin.

[1] In 1992, a division of Toronto-based Horsham Corp. bought Clark Oil and Refining, which included the two refineries and around 1,000 gas stations.

Horsham became TrizecHahn, and then sold 80% of Clark to The Blackstone Group, another investment firm, and another portion to Occidental Petroleum.

[2] Clark gas stations are now operating throughout 32 states, with over 1000-branded locations, some with convenience stores under the On the Go name.