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By Ian Walker and Simon Zekaria

LONDON--Balfour Beatty PLC (BBY.LN) on Wednesday appointed Philip Aiken as non-executive chairman and announced a broad overhaul of its operations to boost profits, after turbulent months for the ailing support services and construction company.

Mr. Aiken will take up his new post on March 26, replacing Steve Marshall, who is retiring after 10 years with the company. Balfour Beatty said Mr. Aitken has extensive global business experience in the industrial and resources sectors, having worked in the U.K., U.S., Asia and the Middle East.

He is currently non-executive chairman of software engineering group Aveva Group PLC (AVV.LN), a non-executive director of National Grid PLC (NGG) and of Newcrest Mining Ltd. (NCM.AU). He will step down from the board of National Grid on Feb. 25.

At 1448 GMT, Balfour Beatty shares were up 0.2% at 232.5 pence. Analysts said the appointment comes at a key time for the firm as it seeks fresh direction, boosting investor sentiment.

"We see huge scope to generate value through portfolio rationalization, margin increases and better working capital. The balance sheet is much stronger than the market thinks," said Liberum analyst Joe Brent.

In August last year, the London, U.K.-based company spurned a potential 2 billion pound ($3 billion) all-share merger with smaller rival Carillion (CLLN.LN), which would have created the U.K.'s largest construction company. Instead, Balfour Beatty agreed to sell its U.S. professional service unit Parsons Brinckerhoff to WSP Global Inc. for $1.35 billion, a transaction that was a stumbling block in the merger talks with Carillion.

After appointing Leo Quinn as chief executive to replace Andrew McNaughton, the company in January issued a profit warning, the latest of a series in the past couple of years, citing cost overruns and project delays. Balfour also cancelled a proposed GBP200 million buyback program and said it would review its dividend policy.

"We doubt Leo Quinn will pass up the opportunity to insert more caution in March and we fear he will leave the door open to more downgrades in August," said Mr. Brent.

On Wednesday, Balfour Beatty said it is focused on a group-wide overhaul to improve profit and cash generation.

"I am very much looking forward to working with the board and the executive team in setting the business back on the course of value creation with Leo and his team," said Mr. Aiken.

Mr. Marshall, 58, was appointed a director of Balfour Beatty in 2005 and chairman in May 2008, before becoming executive chairman in May 2014.

Write to Ian Walker at ian.walker@wsj.com and Simon Zekaria at simon.zekaria@wsj.com

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