Kantar reported that Aldi and Lidl attracted nearly one million additional households to their stores during the past three months.
Increasing their market share to 6.8% and 5% respectively.
Fraser McKevitt, head of retail and consumer insight at Kantar Worldpanel, said: “Overall supermarket sales increased in value by 3.8%, with an additional £1 billion ringing through the tills compared to the same festive period last year. Shoppers parted with £747 million on 22 December alone, making the Friday before Christmas the busiest shopping day ever recorded.”
Online supermarket sales rose 4.9% year-on-year, with Ocado leading the segment and increasing sales by 8.4% to account for 1.3% of the grocery market, a 0.1% increase.
The Co-op was the only supermarket to record a decline in sales, dropping 0.2%, with its market share also dipping 0.1% to 5.2%.