Kansas City-based Boulevard Brewing is being sold to Belgian Brewer Duvel Moortgat.
Boulevard is one of the country's largest craft beer makers.
Company founder John McDonald said in a letter on the company's website that the sale will "take Boulevard to another level."
McDonald says he approached Duvel three months ago. They struck a deal that's expected to close by the end of the year. Financial details were not disclosed.
Boulevard has grown rapidly since its founding in 1989.
It produces 185,000 barrels of beer annually and sells it in 25 states, as well as in Scandinavia.
Duvel brewed 700,000 barrels of beer last year and employs 900 people. Boulevard has 125 employees.