Revenue: £250.7m (+8%)
Net profit margin: 10.2% Staff: 1,723
This London-listed cybersecurity provider almost quadrupled net profits to £25.5m on revenues that rose seven per cent to £250.7m in its year to 31 May 2019. UK assurance revenue declined 1.1 per cent to £88.9m, which NCC attributed to a managed decline in low-margin reselling and high staff turnover. In 2015, staff appeared as cyber experts on TV show Hunted.