Activist investor ValueAct Capital Management LP has taken a more than 5% stake in Rolls-Royce Holdings PLC after the British engine maker suffered a series of profit warnings that has weighed on its stock.

ValueAct crossed the 5% reporting threshold on July 29, Rolls-Royce said in a regulatory announcement. The investor, which has had a smaller share in Rolls-Royce for some time, now holds 5.44% of the stock, the regulatory notice said.

Shares in London-based Rolls-Royce spiked more than 6% on the news.

"We look forward to engaging with ValueAct, just as we do with all investors," a Rolls-Royce spokesman said. "We welcome any investor who recognizes the long-term value of our business," he said.

The San Francisco-based hedge fund seeks to add long-term value to companies, working behind the scenes with management rather than seeking to fight publicly like many activists.

Founded by former Fidelity stock picker Jeffrey Ubben, ValueAct gained attention in 2013 when it took a board seat at Microsoft Corp. though it held less than 1% of the stock. It was the first time the software giant appointed an activist shareholder to its board. The investor this year also took a stake in oil-field services provider Baker Hughes, which Halliburton Co. is buying.

Rolls-Royce has been struggling with headwinds in its marine engine business as demand for ships has ebbed because of the fall in crude prices. Profitability at the crucial aerospace unit also has been under pressure, in part owing to weakening demand for one of its most profitable widebody engines.

Rolls-Royce on Thursday reported a 32% fall in pretax profit to £ 439 million ($695 million) and a 3% fall in sales. Chief executive Warren East, in the job less than a month, is undertaking an operational review of the business. He said on Thursday that he sought to speed transformation efforts.

Rolls-Royce has faced some calls to focus on its aerospace activities and shed some other businesses. Mr. East said he's not planning to shake up the company's strategy.

Rolls-Royce chairman Ian Davis said in April, when he named Mr. East to replace John Rishton, that the board was comfortable with the strategic direction of the company.

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

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