Wal-Mart Stores, Inc. is an American public corporation that runs a chain of large, discount department stores. It is the world's largest public corporation by revenue, according to the 2007 Fortune Global 500. Founded by Sam Walton in 1962, it was incorporated on October 31, 1969, and listed on the New York Stock Exchange in 1972. Walmart is the largest private employer in the world and the fourth largest utility or commercial employer, trailing the Chinese army, the British National Health Service, and the Indian Railways.
Wal-Mart is the largest grocery retailer in the United States, with an estimated 20% of the retail grocery and consumables business. Wal-Mart operates in Mexico as Walmex, in the UK as ASDA, and in Japan as Seiyu. It has wholly-owned operations in Argentina, Brazil, Canada, Puerto Rico, and the UK.