Boston Beer has reported a 38% rise in net income for the third quarter to US$4.2m, or US$0.29 a share, against US$3m in the corresponding period last year.

Revenue at the US micro-brewer, which produces the Samuel Adams Boston Lager brand, increased by 15.5% to US$63.2m.

The results were well ahead of market expectations which had predicted net income of around US$0.20 a share on sales of US$59.6m.

"The craft beer category has grown this year, despite price increases, while the beer industry as a whole has been relatively flat," said Boston Beer's chairman Jim Koch.

The company expects earnings of between US$0.96 and US$1.00 per share for the full year.