S&P Downgrades 171 CDO Tranches

Standard & Poor's Ratings Services has lowered its ratings on 171 tranches (totaling $29.46 billion) from 43 U.S. cash flow and hybrid collateralized debt obligation transactions. The rating agency also removed 93 of the downgraded ratings from CreditWatch with negative implications and affirmed four ratings and removed them from CreditWatch negative. S&P said 27 of the affected transactions are mezzanine structured finance CDOs of asset-backed securities, which are collateralized largely by mezzanine tranches of residential mortgage-backed securities and other structured finance securities. Twelve are "high-grade" structured finance CDOs of ABS, which the rating agency defined as those backed at origination primarily by tranches of RMBS and other structured finance assets that are rated from single-A through triple-A. The other four are CDOs of CDOs backed chiefly by notes from other CDOs. The downgrades reflect various factors, including credit deterioration and recent negative rating actions on subprime RMBS securities, the rating agency said. S&P can be found on the Web at http://www.standardandpoors.com.