61. Trams - £35.4m

The B2B Apple specialist has nigh-on doubled in size in the last year following the acquisition of the UK arm of German-based rival Cancom, coupled with double-digit organic growth. Revenues at its existing business jumped about £2.6m to almost £21.8m, with operating profit rising from less than £450,000 to £627,125. The new addition has recently been renamed Tramscom.