Kornerstone is divided into two separate companies, Kornerstone Administrative Services and Kornerstone Guaranty Insurance Company. Kornerstone Administrative Services focuses on marketing, selling, and servicing after market products in the automotive industry. Kornerstone Guaranty Insurance Company is a captive insurance fund that functions in crucial roles for the admin company as well as for its partner, Ken Garff. The company is located at 111 E Broadway Ste. 900 in Salt Lake City, Utah.