Revenue: £70m (+367%)
Net profit margin: N/A Staff: 39
Founded in 2002, this Oslo-based Microsoft, IBM, SAP and AWS partner bills itself as the global leader in SAM and cloud and volume licensing, with 1,200 staff. The countries included in its ‘Growth Markets' division - UK, France, Germany and the Middle East - generated more than a quarter of Crayon's NOK9bn (£770m) revenues last year. Based on market sources, we estimate its UK arm, which is based on the 2013 acquisition of FAST, now turns over roughly £70m.