Eight classes from Silver Martin CDO I Ltd., a collateralized debt obligation backed partly by subprime mortgage-backed securities, have been downgraded by Fitch Ratings, and seven of the classes have been removed from Rating Watch Negative. Fitch attributed the downgrades to "significant collateral deterioration" in the portfolio, especially subprime residential MBS, alternative-A RMBS, and structured finance CDOs with underlying exposure to subprime RMBS. Since the last rating action on the transaction in November, nearly 66% of the portfolio has been downgraded, the rating agency said.
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