24. Avanade

Key points

Revenue: £145.5m (+22%)

Net profit: 10.2%

Staff: 377

Mirroring the fortunes of its sole vendor partner Microsoft, Avanade's UK arm is enjoying a growth spurt, with revenues for its year to 31 August 2017 soaring 22 per cent. Net profits increased even more quickly, from £9.8m to £14.8m. Globally, Avanade - a 50-50 joint venture between Microsoft and Accenture - has 30,000 staff and 24,000 certifications in Microsoft technology.