The billionaire trader posted a 37 per cent gain last month in his own hedge fund that makes riskier bets, according to a person with knowledge of the matter, burnishing a trading reputation dulled in recent years by subpar performance at his Brevan Howard Asset Management. Howard's AH Master Fund, which he started in 2017, is now up about 44 per cent this year, the person said. "I am happy that the loyalty and confidence shown by my investors has been rewarded with a very positive result," Howard, 54, said by email, without confirming the returns.