Laing O’Rourke was founded in 1978 by its chairman and chief executive, Ray O’Rourke, 70. The group’s prominent recent projects include London’s “Cheesegrater” tower, the tallest in the City, and Crossrail. Last year the firm’s turnover decreased 18% to £2.4bn, and it reported a loss, partly because of delays in several large projects. In April it revealed that Sir John Parker, 75, will join as chairman later this year when he steps down from the same role at the mining multinational Anglo American.

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Company details
Year2017
Rank16
CompanyLaing O’Rourke
ActivityEngineering and construction group
LocationDartford
Sales £m2,354
Profit £m-32
Year endMar 16
Principal shareholdersRay O’Rourke and Des O’Rourke through Suffolk Partners Corporation (100%)
Staff15,234
Founded1978
Websitewww.laingorourke.com

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* Supplied by company † Annualised figure