Revenue: £107.2m (+39%)
Net profit: 0.9% Staff: 62
This Manchester-based Apple partner punches well above its headcount, clawing in £107.2m in revenues in calendar 2019 despite only have 60-odd staff. Net profit doubled to £974,000. It's been two years since education and corporate-focused GBM broke into the consumer space with the launch of its Sync brand. Holding four accreditations with Apple, it also partners with the likes of Jamf, Microsoft, Google, Synology, Adobe, Sophos and Asus.