Four classes of notes from two collateralized debt obligations managed by ACA Management LLC have been placed on Rating Watch Negative by Fitch Ratings.The affected securities are class D of ACA ABS 2003-1 and classes B-F, B-V, and C of ACA ABS 2003-2. The transactions are supported chiefly by residential mortgage-backed securities, along with asset-backed securities, other CDOs, commercial MBS, and the debt of real estate investment trusts, Fitch said. The negative rating actions were based on credit deterioration within the two portfolios and the high exposure of the two transactions to underperforming 2006 vintage subprime closed-end, second-lien RMBS assets, the rating agency said. In addition, 2.18% of the portfolio has been placed on Rating Watch Negative.

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