J Sainsbury plc, trading as Sainsbury's, is a British supermarket and the second largest chain of supermarkets in the United Kingdom, with a 14.6% share of UK supermarket sales in September 2022.Founded in 1869 by John James Sainsbury with a shop in Drury Lane, London, the company was the largest UK retailer of groceries for most of the 20th century. In 1995, Tesco became the market leader when it overtook Sainsbury's, which has since been ranked second or third: it was overtaken by Asda from 2003 to 2014, and again in 2019. In 2018, a planned merger with Asda was blocked by the Competition and Markets Authority over concerns of increased prices for consumers.The holding company, J Sainsbury plc, is split into three divisions: Sainsbury's Supermarkets Ltd (including convenience shops), Sainsbury's Bank, and Argos. As of 2021, the largest overall shareholder is the sovereign wealth fund of Qatar, the Qatar Investment Authority, which holds around 15% of the company. It is listed on the London Stock Exchange and is a constituent of the FTSE 100 Index.

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