Dirk Roethig, managing director and global head of securitization at IKB Deutsche Industriebank in Düsseldorf, has left the firm. IKB is one of the largest collateralized debt obligation investors in Europe, according to dealers, and Roethig headed the investment team. Roethig could not be reached, but Roland Nolte, spokesman, confirmed the departure, adding he has not yet been replaced. It could not be determined if Roethig has taken a new position.