James Chrystal has left Nex Traiana, the firm that he co-founded in 2000. Although a spokesperson for Nex Group declined to comment on the news, Profit & Loss understands that Chrystal has left the firm, where he was most recently acting as head of exchange traded derivatives. Prior to co-founding Traiana in 2000, Chrystal worked at the Chicago Board of Trade (CBOT), joining as a director in its financial markets group in 1987 before being named director for e-trading sales and distribution in 1999.