The founders of BrewDog could pocket as much as £100m after selling a slug of the Scottish craft beer maker to an American private equity giant.

TSG Consumer Partners is splashing out £213m on a 22% stake in the Punk IPA brewer, giving the 10-year-old business an enterprise value of £1bn.

The deal with the San Francisco buyout firm, owner of snack brand Popchips and Glaceau Vitaminwater, will serve up big windfalls for James Watt and Martin Dickie. The 34-year-old schoolfriends set up the company in Fraserburgh, Aberdeenshire, with a £20,000 bank loan.

It is believed to be one of the biggest-ever paydays for entrepreneurs who have tapped online crowdfunding platforms for capital. The company raised more than £50m this way, and has more than