Revenue: £44.8m (+4%)
Net profit margin: 4.7% Staff: 198
This IBM and Microsoft Azure partner had a busy fiscal year to 31 December 2018, integrating acquisition Niu Solutions and relocating its HQ and security operations centre from London to Birmingham. With annuity revenue streams now generating more than 80 per cent of its margins, CSI said it is on course to hit £15m EBITDA within two years, up from £10m last year. Last month it acquired £31m-revenue IBM partner Tectrade.