Moody's Eyes 184 CDO Tranches

Moody's Investors Service has announced that 184 tranches of 91 collateralized debt obligations backed primarily by residential mortgage-backed securities have been placed on review for possible downgrade.The CDO rating actions affect securities with an original face value of approximately $5 billion, Moody's said. They primarily reflect recent rating actions by Moody's on residential mortgage-backed securities associated with first-lien subprime mortgages from the 2006 vintage and second-lien loans of the 2005/2006 vintage, as well as the structures of the individual transactions, the rating agency said.