Revenue: £51.7m (+28%)
Net profit margin: -27% Staff: 499
This London-based MSP is a £75m-revenue business following its takeover this August of rival Mirus IT, CEO Peter Sweetbaum told us. Accounts for Microsoft partner IT Lab's year to 31 March 2019 show revenue swelling by over a quarter to £51.7m but with Mirus and 2018 acquisition Content and Code folded in, the pro-forma total was £69m. Although net losses widened to £14m, adjusted pro-forma EBITDA was "circa £8.8m", Sweetbaum told us.