Tesco, Britain's largest retailer, was the only one of the country's big four grocers to grow sales in the last 12 weeks, increasing its sector dominance in the run-up to Christmas, data from market researcher NielsenIQ showed on Tuesday.
It said Tesco's sales rose 0.4% year-on-year in the 12 weeks to 6 November, increasing its market share by 0.2 percentage points to 26.6%.
In contrast smaller rivals Sainsbury's, Asda and Morrisons saw sales fall 3.1%, 2.4% and 4.7% respectively, and all lost market share.
NielsenIQ's data echoed figures from rival researcher Kantar last week.
First Half Profit
Last month, Tesco reported a 16.6% jump in first half profit and raised its full-year earnings forecast despite supply chain disruption.
NielsenIQ said total UK grocery sales fell 2.0% in the four weeks to 6 November versus high comparative numbers ahead of a second national COVID-19 lockdown last year.
Sales were, however, up 4.9% on the same period in 2019.
The researcher noted that in-store visits to supermarkets were up 6.5% compared with last year over the four week period, equal to 28 million more visits.
In contrast, the online share of sales fell to 12.2%, down from 12.6% in the previous four weeks.
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