Brevan Howard Asset Management, the U.K.-based hedge fund, has opened Brevan Howard U.S. Investment Management, based in New York.
Beginning in August, the firm will trade a capital allocation from Brevan Howard Master Fund, according to a newsletter from the firm. The office opened last month.
The Master Fund, with more than $25 billion, gained 12% last year but declined 2.2% in June and was down 3.6% for the first six months of 2012. It hasn't posted an annual loss since its inception in April 2003.
Brevan Howard also has hedge funds focused on commodities, emerging markets and bonds.
A spokesman for the firm said Brevan Howard would not provide further information.
Bloomberg News contributed to this story.