Ocado has retained its title as the UK’s fastest growing retailer over the past 12 weeks, while Asda was the only UK supermarket to suffer a decline in market share, new data shows.

According to the latest figures from Kantar, over the 12 weeks to 20 April 2025 sales at Ocado grew by 11.8% compared to a year ago. The online supermarket now takes 1.9% of the market.

Lidl saw the fastest rise in footfall over the period, with shoppers walking through its doors an average of 8.8 times each over the quarter to deliver sales growth of 10.1%, helping it to reach an 8% market share.

Meanwhile, rival discounter Aldi’s above-market sales growth of 5.8% means it now holds an 11% market share.

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Spending on groceries at M&S grew by 14.4% over the 12 weeks and by 6% at Tesco versus the same period last year, with Britain’s largest grocer now holding 27.8% of the market.

Sales at Sainsbury’s grew by 4.4%, taking its share to 15.3%, while Waitrose’s portion of the market remained stable at 4.5%. Sales at Co-op, Morrisons and Iceland grew by 1.9%, 1.8% and 2% respectively over the last year.

However, Asda saw a decline in sales year on year of -3.8%, with its market share down one percentage point over the period to 12.3%.

Kantar head of retail and consumer insight Fraser McKevitt said: “The grocers have been sharpening their pricing strategies to stay competitive in the fight for footfall. They’ve invested in price cuts which were the main driver of promotional growth.

“Often linked to loyalty cards, spending on these deals grew by £347 million. At Tesco and Sainsbury’s, nearly 20% of items sold are on a price match, and they end up in almost two thirds of baskets.”

However, he added: “It’s not all about price perceptions alone. What’s clear is that shoppers want quality too. Ultimately, retailers need to be seen to be offering great value but it’s a fine tightrope to walk, particularly as they manage their own business costs.”

The supermarket share figures come as overall take-home sales at the grocers increased by 6.5% over the four weeks to 20 April 2025 versus 2024, boosted by Easter falling later this year.

According to Kantar, while grocery price inflation also edged up to 3.8%, spending on Easter eggs continued to grow, up 11%.

McKevitt said: “Chocolate confectionery prices rose by 17.4% this period, the fastest of any category, but that didn’t stop the British public treating themselves this Easter.  The volume of chocolate eggs sold through supermarket tills still grew by 0.4% on last year, while at the dinner table lamb was the most popular fresh meat joint, followed by beef and pork.”