The group is looking to raise a record £4m through selling shares to beer fans.
It plans to use the new investment to fund an expansion of its brewery, its bar division and the opening of new series of bottle shops across the UK.
The company has made 42,000 shares available to anyone, at £95 each. It previously raised £2.2m through Equity for Punks in 2011.
The group, which is on track to turnover £20m in 2013, has opened 12 bars since 2010 – largely funded by Equity for Punks investment – including its first international location in Stockholm, Sweden, and opened its new £7.5m brewery earlier this year in Ellon, Aberdeenshire.
It has already said it is targeting Sheffield, Liverpool, Brighton, Cardiff, Cambridge, Oxford and south and west London for UK openings this year. In terms of the capital, co-founder James Watt has mentioned Hammersmith, Shepherd’s Bush and Brixton as areas he’d like to operate in.