21 Banner Group
Revenue: £191.9m (+25%)
Net profit margin: 0.2% Staff: 556
The technology arm of this business supplies hulk boasts Platinum and Gold partnerships with HP, Dell, Lenovo, Samsung, Acer and Xerox. Artificially boosted by a group restructure, Banner saw revenues balloon 25 per cent in its year to 31 December 2018. The Sheffield-based firm made three trade and asset acquisitions during the period, including that of £11m-revenue consumables specialist Spectrum.