Brevan Howard Asset Management’s flagship macro hedge fund is surging amid the ongoing market turmoil, on course for its best monthly gain since starting in 2003. The Brevan Howard Master Fund returned 17% in the three weeks through March 20, boosting its gain for this year to 21.6%, according to a letter to investors seen by Bloomberg. The firm’s best month so far was a 9.9% gain in January 2008. A spokesman for the Jersey-based investment firm declined to comment. The returns mark a turnaround for the hedge fund that’s seen assets plunge to $3.3 billion from its 2013 peak of almost $28 billion as clients exited ... (full story)