81. Business Systems International

Revenue: £54.5m (+37%)

Staff: 7

This London-based provider of IT infrastructure for the financial markets saw revenues dip by more than a third to £54.5m in its year to 31 March 2022. BSI branded it "an exceptionally good year", however, as brisk demand for machine learning environments enabled it to export record volumes to Nordic datacentres (a development it claims resulted in it becoming Dell's largest EMEA server supplier and NVIDIA's largest GPU partner in northern Europe). UK revenues generated £18.5m of the total.