LONDON--J Sainsbury PLC (SBRY.LN) on Tuesday reported lower same-store sales for the fourth quarter, while warning that the year ahead remained challenging as it battles falling prices and stiff competition.

For the 10 weeks through March 14, Sainsbury reported a 1.9% fall in same-store sales, excluding fuel. Total retail sales on this basis fell 0.3%.

Chief Executive Mike Coupe said Sainsbury has "absorbed record levels of food deflation," adding that he expects this to persist, which along with competitive pressures will likely continue to impact prices.

The company didn't give sales or profit figures on Tuesday.

Sainsbury had previously warned that profit for the second half of the year would be lower than for the first half as the retailer pumped more money into price cuts to defend its market share from discount chains such as Aldi and Lidl that are winning market share.

The U.K.'s biggest supermarkets have all been cutting prices to compete against the discounters, whose limited product range allows them to offer lower prices.

Sainsbury on Tuesday said it saw volume growth across its food business, rising by over 3% on average across 1,100 products on which it has cut prices. Like rival Tesco PLC (TSCO.LN), Sainsbury has been working to simplify the shopping experience, as bewilderingly large ranges and choppy pricing strategies are seen to have driven customers into the arms of the discounters. Tuesday, Mr. Coupe said the company's bid to replace one-off promotions with consistently lower prices has been well received by customers.

According to most recent data from consumer research group Kantar Worldpanel, Sainsbury's market share slipped 0.5% for the 12 weeks to March 1, while Aldi and Lidl gained 19% and 14% respectively from a year ago. During that same period, rival Tesco posted its strongest performance in 18 months, with sales up 1.1% from a year earlier.

Shore Capital analyst Darren Shirley recently warned than Tesco's gains could hurt Sainsbury. "We are particularly concerned for Sainsbury's that Tesco may get its act together," said Mr. Shirley, adding that the retailer had materially benefited from Tesco's under-performance.

For the year ended March 2015, analysts expect pretax profit, after stripping out one-time items, of 659 million, according to Sainsbury's website.

-Write to Saabira Chaudhuri at saabira.chaudhuri@wsj.com

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