58. CSI

Revenue: £73.3m (+24%)

Net profit: -21.3% Staff: 248

Bolstered by 2019 acquisition Tectrade, this IBM Power and Azure partner saw revenue rise by nearly a quarter to £73.3m in calendar 2020. Having enlisted former Veritas UK boss Simon Frisk as CEO in December 2020, MML Capital Partners-backed CSI appointed Daisy alumni Andy Dunne as chief revenue officer in May 2021. Tectrade - along with June 2020 acquisition APSU US - will hand CSI a "strong base" to expand in North America, it said, with overseas sales rising from £3.1m to £15m last year.

Covid impact

In its strategic report, CSI admitted it had been gearing up for "substantial growth" in 2020, but that Covid resulted in reduced income from the retail, hospitality and travel sectors. EBITDA of £10.7m and revenue growth was "in line with forecast", however.