'London whale' drives market, say investors

Traders at work on the floor of the New York Stock Exchange. Bruno Iksil, a London-based JPMorgan Chase & Co trader who specializes in credit-derivative indexes, has been nicknamed "the London whale" by some traders. Investors have complained that Iksil's trades may be distorting prices and are affecting bondholders who use the instruments to hedge hundreds of billions of dollars in fixed-income holdings. Jin Lee / Bloomberg