43. GCI

This Microsoft Skype for Business partner expects turnover for its current year to top £96m as it continues to bed down recent acquisitions, which include Outsourcery, Freedom Communications and Blue Chip Data Systems. For its year to 31 December 2017, revenue boomed by 67 per cent to £86.7m, although net losses widened from £923,000 to £2.9m. GCI was gifted a fresh £60m M&A war chest in May 2018 by new private equity majority owner Mayfair Equity Partners.