An extra two million shoppers visited Sainsbury's in the week of the Queen's Diamond Jubilee.
The UK's third biggest supermarket chain saw 24 million customer transactions and sold 550 miles of bunting, 670,000 Union flags and more than 600,000 bottles of champagne and sparkling wine.
It enjoyed its best ever weekly sales of strawberries, with more than two million punnets sold, 13 per cent greater than the previous record in Wimbledon week last year.
The supermarket's underlying sales rose 1.4 per cent in the 12 weeks to June 9, which was slower than the 2.6 per cent in the previous quarter, but according to the grocer was still stronger than the rest of the market.
Earlier this week, market leader Tesco reported a 1.5 per cent fall in underlying sales for a period, not including Jubilee week.
Chief executive Justin King said: "Customers continued the habit of savvy shopping to save money in order to be able to treat themselves on special occasions, shown by strong sales in the lead-up to the Jubilee celebrations."
He added that Sainsbury's was "well placed" to continue to outperform the market.