Market researcher Kantar WorldPanel said supermarkets took an extra £213m in the tills in the week ending 3 June.
“The remarkable growth rate recorded over the Jubilee is a sign of what’s to come during the Olympics when we expect grocery sales to soar,” said Edward Garner, director at Kantar WorldPanel.
“Competition is likely to be fierce with fortunes now considerably different among the big four.”
Overall, sales were up 3.2 per cent in the period at £31.9bn, with Asda’s and Sainsbury’s market share strengthening, while Tesco and Morrisons suffering share dips.
Asda’s 3.5 per cent growth was partly due to its Netto acquisition, while Sainsbury’s Brand Match helped boost its 4.2 per cent growth.
Waitrose, Aldi and Lidl, all recorded the strongest growth in market share, but Tesco is still the biggest retailer.