Revenue: £70.2m (+62%)
Net profit: -18.9% Staff: 338
This acquisitive business voice and data provider saw revenues boom 62 per cent in its year to 31 March 2019. One of only eight O2 Service Providers in the UK, the Basingstoke-based outfit made four acquisitions during the year, three of which came after securing a fresh M&A war chest from Santander and Ares Management in August 2018. Billing itself as a tier-2 ISP, it counts Avaya, SpliceCom, Panasonic and NEC among its other vendor muckers.