Castle Brands has said it expected to post a first-half loss due to its increased marketing investment and costs related to its status as a public company.

The US spirits group earlier this week posted a net loss of US$8.9m for the six months to the end of September. The result compared to a net loss of $5.4m in the same period a year earlier.

Castle, which listed in New York in April, saw revenue leap 16% to $1.6m during the first half of the year with sales up in the US and internationally.

However, margins fell despite the rise in revenue as Castle made its biggest gains internationally in products with lower margins. Boru vodka case sales rose 25%, while the company's rum stable enjoyed a 22% leap in volumes.

"While the increased investment in our brands and our company's top-line growth resulted in an expected net loss for the quarter, we are on our way to achieving our long-term strategic goals," said Castle chairman and CEO Mark Andrews.