Revenue: £81.7m (+11%)
Net profit: 1.8% Staff: 208
This public sector-focused PC builder and reseller was handed extra M&A "firepower" last December when private equity house Suiter replaced RJD as its backer in an MBO. Stone recently told us its revenue are on course to bulge from £94m to £110m in 2020. The most recent figures filed on Companies House, covering calendar 2018, show a revenue of £81.7m. Stone counts HP, Dynabook, Intel, Lenovo, Cisco Meraki, Blancco and Acer among its vendor pals.