19. GBM Digital

Key points

Revenue: £182.9m (-27%)

Net profit: 0.8%

Staff: 55

Billing itself as the UK's largest Apple Authorised reseller, this Manchester-based outfit's revenues for its year to 31 December 2017 slid 27 per cent to £182.9m. GBM Digital sells to schools and businesses, but in March it leapt into the consumer space when it opened a technology hub in Manchester city centre under the ‘Sync' banner. It also partners with Adobe, WatchGuard and Jamf Software.