...Fitch Ratings has initiated a broad review of recent vintage Alternative-A (Alt-A) residential mortgage backed securities (RMBS). On March #, Fitch placed rated classes from ### Alt-A RMBS transactions on Rating Watch Negative (RWN). The RMBS placed on Rating Watch were issued in ####, ####, and #### and encompass the ratings spectrum from AAA to B . Fitch initiated this review in response to deteriorating mortgage performance resulting from declining home prices and adverse market conditions, combined with high-risk collateral products. The review incorporates revisions to Fitch s Alt-A surveillance methodology for th e ####, ####, and #### vintage collateral, as described in this report. Pools characterized as Alt-A credit quality generally have credit attributes that are slightly more risky than prime but more so und than subprime. Weighted average Fair Isaac Corp. (FICO) credit scores generally fall between ### and ###, combined loan-to- value ratios (CLTVs) average...
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