By Robert Wall

LONDON--Rolls-Royce Holdings PLC (RR.LN) on Thursday said profit and sales retreated amid sustained weakness in key markets.

The British maker of jetliner engines for Boeing Co. (BA) and Airbus Group SE (AIR.FR) planes reported first-half net profit of 360 million pounds ($561.41 million), down from GBP532 million a year earlier. The company's more closely watched underlying pre-tax profit slipped 32% to GBP439 million, slightly ahead of the GBP390 million to GBP430 million range Rolls-Royce gave earlier this month.

Underlying sales slumped 3% to GBP6.3 billion, the London-based company said.

Rolls-Royce's earnings have been repeatedly hit by deteriorating conditions in key markets that caused the engineering company to halt its first ever share repurchase. A slowdown in sales of its profitable Trent 700 aircraft engines that power Airbus A330 widebodies is weighing on its aerospace business, which is also struggling with sales for regional jet and business aircraft. Low crude prices have caused sales in the marine sector to stall.

"Despite the disappointment of our recent update, our second half outlook remains positive," said Chief Executive Warren East, who has been in the job less than a month.

Rolls-Royce maintained its full-year outlook. The company earlier this month cut its outlook for underlying pre-tax profit to a range of GBP1.33 billion to GBP1.48 billion. It also lowered its cash flow expectation.

-Write to Robert Wall at robert.wall@wsj.com

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