17. Telefónica Tech UK&I

Revenue: £220m (+47%)

Staff: 1,000

The UK arm of this fast-growing IT solutions provider had a busy 2022, acquiring Microsoft partner Incremental for up to £175m in March and swapping CEOs in the summer. Although a lack of consolidated accounts makes it tough to officially size the business, CRN understands from market sources that its calendar 2022 revenues leapt from £150m to £220m (including Incremental's nine-month contribution). Part of Madrid-based telecoms giant Telefónica, Telefónica Tech counts the UK as one of four key investment territories alongside Spain, Germany and Brazil (owing its initial presence here to its 2021 purchase of Cancom UK).