Revenue: £108.6m (+17%)
Net profit margin: 2.5% Staff: 151
This Watford-based reseller branded its 12 months ending 31 December 2018 a "very successful year", as revenues hiked 17 per cent and net profits beefed up from £2m to £2.7m. Billing itself as "one of the UK's fastest-growing VARs", Storm holds accreditations with over 40 vendors, including Platinum status with Dell EMC and Lenovo. It is currently in the midst of a redevelopment project to expand its offices and warehouse capacity.