28. Stone Computers

Revenue: £129m (+9%)

Staff: 378

This Staffordshire-based PC builder, reseller and ITAD hailed its "strong trading performance" in its final full-year results as an independent company (ahead of its £39m sale to Canadian outfit Converge Technology Group in October 2022). Calendar 2021 revenues pogoed nine per cent to £129m, while net profits widened from £2.9m to £3.8m. Replacing 500 PCs and laptops for Leeds school Allerton Grange is among the case studies highlighted on the education and public sector specialist's website.