Angus MacSween's family were crofters on the Isle of Lewis. He served as a naval officer and later set up a telecoms company, Teledata, sold to Scottish Telecom, for £11m in 1996. Two years later he set up Iomart, and floated it on the Aim in 2000. Now a fast growing cloud computing operation, Iomart is worth £280m. It recently ended talk on a potential £300m takeover.
Activity: Cloud computing
Latest turnover: £56m
Five-year rise in turnover: 211%
No. of employees: 293
Five-year rise in employment: 102%