This peer-to-peer betting site allows punters to set their own odds on sports events, politics and current affairs. Its chief executive, Jason Trost, 35, started the company in 2008 in an attempt to undercut traditional bookmakers by applying financial trading principles to sports betting. Since then, more than £3bn has swapped hands on its exchange, helping sales grow to £10.4m in 2015. Smarkets has raised £2.5m from investors and is now reportedly considering a stock market flotation in New York.

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Company details
Year2016
Rank5
CompanySmarkets
ActivitySports betting exchange
LocationEast London
Average 3 year sales growth205.90%
Latest sales £000s*10,400
Staff41
Founded2008
Websitewww.smarkets.com

If applicable:

* supplied by company † annualised figure