Tesco, Sainsbury's Make Millions Off Loyalty Card Data: Times - Bloomberg

Tesco Plc and J Sainsbury’s Plc, two of the biggest UK supermarkets, make about £300 million ($376 million) a year from selling information about their customers’ shopping preferences, the Times reported.

A third of Tesco and Sainsbury's loyalty card prices 'not as good as they seem', watchdog warns

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Inflation Hits Loyalty Cards as Tesco, Sainsbury Ramp Up Promotions - Bloomberg

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The best UK supermarket loyalty schemes: Tesco, Sainsbury's, Morrisons and more