Tesco plc (), trading as Tesco, is a British multinational groceries and general merchandise retailer headquartered in Welwyn Garden City, England. It is 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 seven countries across Asia and Europe, and is the market leader of groceries in the UK (where it has a market share of around 28.4%), Ireland, Hungary and Thailand.