77. Viadex

Key points

Revenue: £49.4m (+51%)

Net profit: 1.9%

Staff: 57

This Surbiton-based VAR is one of the most globally diverse firms in the top 100, having completed projects in 104 countries as far flung as Tanzania, Cameroon, Bahrain and Taiwan in the last 18 months. It climbs 20 places in this year's Top VARs courtesy of a 51 per cent revenue boom in its year to 30 June 2017, with just over half of that total generated overseas. This summer it opened a Dubai office and launched a joint venture with cybersecurity VAR Performanta.