By Tapan Panchal

J Sainsbury PLC (SBRY.LN) on Wednesday posted a third successive quarterly decline in sales and warned on its second-half sales performance, amid stiff competition among U.K. supermarket chains.

The figures will come as sobering news for new Chief Executive Mike Coupe, who took over in July from Justin King, who had been CEO for 10 years. Mr. King is credited with overseeing nine years of unbroken growth, though the end of his tenure was marked with two final quarters of negative same-store sales.

Sainsbury is trying to boost flagging sales amid a challenging U.K. retail environment, where discount chains Aldi Stores Ltd. and Lidl UK GmbH are forcing the U.K.'s larger supermarkets to cut prices to retain customers. Sainsbury has responded to the competition by lowering prices on thousands of products and teaming up with Danish discounter Netto to open Netto stores in the U.K.

"In the second quarter, our performance has been impacted by the accelerated pace of change in the grocery market, including significant pricing activity and food price deflation in many areas," Mr. Coupe said in his first trading statement for the company.

The chain has retained its No. 3 position, behind Tesco PLC and Wal-Mart Stores Inc's Asda, with a market share of 16.6%, according to Kantar market data for the 12 weeks ended July 20. Kantar monitors the household grocery purchasing habits of 25,000 representative households in the U.K.

In mid-morning trading in London, the company's shares were trading 4.8% lower at 240 pence each. Year-to-date shares are down nearly 39%.

For the 16 weeks to Sept. 27, the supermarket reported a 2.8% fall in same-store sales, excluding fuel. Total quarterly sales, excluding fuel, declined 0.8%. In the first half of the year, it posted a 2.1% fall in same-store sales, excluding fuel.

"These [challenging] conditions are likely to persist for the foreseeable future and we now expect our like-for-like sales in the second half of the year to be similar to the first half," Mr. Coupe said.

Previously, Sainsbury expected fiscal 2015 sales to grow 0.2%.

Shore Capital analysts have provisionally downgraded their full-year pretax profit forecast by 17% to 650 million pounds ($1.05 billion) on the sales performance and second-half guidance. The brokerage last week predicted Sainsbury to report a 3.5% to 4.0% fall in second-quarter same-store sales and a 1.5% to 2.0% fall in total sales. The forecast was for sales excluding fuel.

Sainsbury's weak performance follows the announcement of a full-scale investigation being conducted by the U.K.'s Financial Conduct Authority at Tesco in relation to overstatement of profits.

On Sept. 22, Tesco suspended four senior executives and called in outside auditors and legal counsel to investigate a GBP250 million overstatement of its first-half profit forecast. The issue involved the early booking of commercial income and delayed booking of costs, triggering a third profit warning in three months.

Ian Walker contributed to the article.

Write to Tapan Panchal at tapan.panchal@wsj.com

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