Billionaire Chris Rokos is back to calling all the shots at his $9 billion eponymous hedge fund firm. London-based Rokos Capital Management is merging the portfolios previously run by individual traders into a single pool of money, allowing it to place bigger bets, Alan Kilkenny, a spokesman for the firm, said in an emailed statement. “Rather than being responsible for individual capital allocations across a series of smaller trading books, product specialists will work within a core portfolio team led by Chris Rokos,” Kilkenny said on Friday.