The company, which produces the likes of Kentucky bourbon barrel ale and Town Branch bourbon and also makes animal nutrition products, bought the breweries from the family of the late Northern Irish businessman Lord Ballyedmond.
It is the first major expansion outside of the US for the firm’s brewing division.
Between them the breweries have the capacity to produce 40,000hl and come with several brands, including Finn lager and Foxes Rock ale.
Irish entrepreneur Dr Pearse Lyons, who earned a doctorate in brewing and distilling before setting up the firm, which has a turnover of more than £1 billion, said: “These new purchases will allow us develop already established European brands while at the same time introducing our Kentucky Ale range to new markets.
“We are dedicated to offering the consumer real choice in the beer sector. Since our first investment in the Alltech Craft Brews & Foods Fair in Dublin three years ago, the sector has mushroomed and our Fair is now the largest in Ireland, attracting more than 10,000 visitors annually.”
The firm also has three breweries under construction in the US and Lyons added: “We want to be one of the top 50 craft brewers in the world.”