Tesco PLC is a British multinational groceries and general merchandise retailer headquartered in Welwyn Garden City, England. In 2011 it was the third-largest retailer in the world measured by gross revenues and the ninth-largest in the world measured by revenues. It has shops in Ireland, the United Kingdom, the Czech Republic, Hungary and Slovakia. It is the market leader of groceries in the UK (where it has a market share of around 28.4%). Tesco was founded in 1919 by Jack Cohen as a group of market stalls in Hackney, London. The Tesco name first appeared in 1924, after Cohen purchased a shipment of tea from T. E. Stockwell and combined those three initials with the first two letters of his surname, and the first Tesco shop opened in 1931 in Burnt Oak, Barnet. His business expanded rapidly, and by 1939 he had over 100 Tesco shops across the country.