Tesco

British multinational grocery and general merchandise retailer founded by Jack Cohen in 1919 — the largest supermarket chain in the UK — and which pioneered loyalty card data analytics (Clubcard) as a competitive advantage in the 1990s.

Demonstrated that loyalty data is as valuable as physical retail scale — the Clubcard program gave Tesco detailed purchase behavior data on millions of customers before big data was a concept — making Tesco the first retailer to operationalize customer data at scale.