As of May 2024, there are 17 supermarket chains currently operating in the United Kingdom. The food retail market has been dominated by the 'big four' supermarkets – Tesco, Sainsbury's, Asda and Morrisons – who made up over three quarters of sector market share in 2010. Tesco is the largest retailer in Great Britain, with a market share of 27.5% at the end of 2022.[a][1]
However, discounters Lidl and Aldi have grown rapidly.[1] A number of sources reported that in September 2022, Aldi overtook Morrisons to become Great Britain's fourth largest grocery retailer.[1][2] At the end of 2022, Morrisons and Aldi both remained at 9.1%.[b][1] Collectively, the big four accounted for two thirds and the big four and discounters combined for four fifths of the grocery market share at the end of 2022.[c][1]
Northern Ireland has similar major chains. In 2022, Tesco was the largest retailer in NI, followed by Sainsbury's, Asda and Lidl.[3] However, the market is different because some chains are not shared between the different parts of the UK. For example, Aldi and Morrisons do not operate there.[4]
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