37. Claranet

Key points

Revenue: £101.2m (+7%)

Net profit: 7.3%

Staff: 459

This acquisitive, London-based MSP continues to expand, and now boasts a turnover of £325m, 43 datacentres, 1,800 staff and 24 offices across Europe and Brazil. In its year to 30 June 2017, Claranet's UK arm saw net profits shrink by £1.3m to £7.4m on revenues of £101.2m. A deal to provide managed hosting for the micro-sites of Peugeot is among the case studies displayed on its website.