Shopko (formerly ShopKo until May 2007) is a chain of retail stores based in Ashwaubenon, Wisconsin, near Green Bay. Shopko was founded in 1962 by James Ruben, and its first store opened in Green Bay. From 1991 to 2005, the company was publicly held, with stock traded on the New York Stock Exchange under the symbol SKO. In December 2005, the company was acquired by an affiliate of Sun Capital Partners and reverted to private ownership.