After the family supermarket operation he was working for was sold in 1985, highlander Roy MacGregor started his own offshore maintenance business, MacGregor Energy Services, which he went on to sell in 1997 for £20m. He began again in 2005 with Global Energy (Holdings), making, inspecting and repairing oil rigs. In 2012 MacGregor sold a 25% stake in the Inverness-based business to Japan's Mitsui to fund expansion. Global Energy has since bought four Australian companies. Profits hit £25.5m on £358m sales in 2012-13. He is also chairman of Scottish Premiership side Ross County FC.
Latest turnover: £358m
Five-year rise in turnover: 201%
No. of employees: 4702
Five-year rise in employment: 509%