Revenue: £51.6m (+9%)
Net profit: 2.2% Staff: 47
Celebrating 30 years in business this August, this Apple reseller saw both revenues and net profits tick up a solid nine per cent in calendar 2019. Counting enterprise device management, storage workflows and media asset management among its fortes, London-based Trams' customer case studies include M&C Saatchi, Guardian News & Media and BBC Sport. It also partners with HPE, Lenovo, Quantum, Dell and Jamf.