30. Jigsaw24

Key points

Revenue: £128.7m (+35%)

Net profit: -0.1%

Staff: 229

Billing itself as the "undisputed leader in the B2B Apple reseller market", Nottingham-based Jigsaw24 performed a secondary MBO in March. Its wackily named parent, Insanely Great, smashed the £100m revenue barrier in its year to 30 May 2017 on the back of 35 per cent growth, driven by Apple and associated services. However, it slipped to a £183,000 net loss as it ate an exceptional charge related to 2014 acquisition Matrix Development Software.