4. CDW Ltd

Revenue: £1.091bn (+10%)

Staff: 1,601

An uptick in device sales helped the UK subsidiary of the world's largest reseller officially break the £1bn revenue barrier in calendar 2021, according to its most recently filed accounts on Companies House.

Sources indicate that CDW's UK business is much larger than the headline number in this profile suggests, however, with 2022 gross revenue thought to be as high as £2.5bn (which would put it level with Softcat).

Having leapt into the UK in 2014 by acquiring Kelway, CDW now has over 1,600 staff in London, Peterborough, Manchester and Nottingham.

Headquartered in Illinois and operating in the US, Canada and the UK, Fortune 500 outfit CDW is now comfortably the world's largest IT solutions provider, with trailing 12-month net sales of around $24bn. That includes the contribution from Sirius Computer Solutions, a US peer it acquired in December 2021.