29. Claranet

Revenue: £121.8m (+5%)

Staff: 502

The UK subsidiary of this MSP bagged a number of "important" new, renewal and extension contracts in its year to 30 June 2021, helping to boost revenues by five per cent to £121.8m. This includes with Kier, OCS Group and Swapcard. The London-headquartered AWS, Microsoft, Google, Cisco, VMware and Nutanix partner announced a trio of acquisitions in France, Italy and DACH in September as part of a "new wave of growth in Europe". It claims to have annualised revenues of £520m, 3,000 staff and 10,000 customers globally.