50. ACS - £40.7m

FY11 is the first year we get a real picture of the scale of the Xerox-owned company, which landed in this country through the acquisition of IBM partners Syan and Anix several years ago. The firm claims to be Big Blue’s largest SMB reseller in the UK. Operating losses last year stood at £204,276, but this is down from a £6.6m loss in the 18-month period to the end of 2010.