Credit Suisse First Bostonhas denied a widespread rumor that it has been offloading large unsold collateralized debt obligation positions in the secondary market. CSFB has been a net buyer of CDOs in the secondary market, according to Kristofer Kraus, director in CDO trading in New York. He added that CSFB continues to issue CDO paper in the primary market, which would be difficult to achieve from a risk management perspective if it were holding large undistributed positions.