PSN is a global provider of engineering, construction, operations, maintenance and project-management services, chiefly to the oil-and-gas sector. Now one of the 10 biggest private Scottish companies, it was formed in 2006 when chief executive Bob Keiller and his management team completed a $280m buyout from the Halliburton subsidiary Kellogg Brown & Root (KBR). PSN says it has created more than 2,500 jobs since 2006 and employs 8,500 people in 26 countries. It claims to have one of the highest industry employee-retention rates, holding on to more than 99% of its staff each month. Sales reached £741m in 2009.

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Company details
ActivityOil services provider
Sales £m*741
Profit £m*55
Year endDec 09
Principal shareholdersLloyds Banking Group (33%), management and other (60%), West Coast Capital (7%)

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* Supplied by company † Annualised figure