Asda Stores Ltd is a British supermarket chain which retails food, clothing, general merchandise, toys and financial services. It also has a mobile telephone network, Asda Mobile. Its head office is in Asda House in Leeds, West Yorkshire.Asda became a subsidiary of the American retail giant Wal-Mart, the world’s largest retailer,in 1999, and is the UK's second largest chain by market share after Tesco.