Revenue: £87.1m (+23%)
Net profit margin: 7.9% Staff: 372
This business telecoms provider is aiming to grow threefold over the next three to five years after snaring £100m in funding from LDC in June. Counting Mitel, Gamma and Vodafone among its vendor partners, the Hampshire-based firm recently announced plans to recruit 125 more staff. In its year to 31 December 2018, OneCom saw revenues bulge by over a fifth as recent acquisition Evolve bolstered the top line. Net profits followed suit, widening from £4.6m to £6.9m.