16. Avanade

Revenue: £220.9m (+16%)

Staff: 636

The UK arm of this Accenture and Microsoft joint venture resumed double-digit revenue growth in its year to 31 August 2021 (having suffered an 11 per cent top-line dip the previous year). Net profits widened from £18.2m to £21.2m. The US-based outfit snapped up two UK IT solutions providers in 2021 in the form of Altius Consulting and QUANTIQ (the latter of which came too late to contribute anything to its most recent fiscal results). Globally, Avanade employs 50,000 staff and claims to hold more than 60,000 Microsoft certifcations.