More than 250 additional classes of subprime mortgage pass-through certificates were downgraded by Fitch Ratings on March 3 as a result of changes to its subprime loss forecasting assumptions. Fitch also affirmed the ratings on classes with outstanding balances of over $15 billion. The securities affected by the latest downgrades included 100 classes from eight Securitized Asset Backed Receivables LLC Trust deals; 56 classes from four HSI Asset Securitization Corp. Trust deals; 32 classes from two IndyMac deals; 28 classes from two Natixis deals; 28 classes from two Washington Mutual deals; seven classes from one Morgan Stanley deal; and five classes from two GSAMP deals. Fitch also placed 11 classes from one UBS MASTR Asset Backed Securities Trust deal on Rating Watch Negative. The rating actions were attributed to changes to Fitch's subprime loss forecasting assumptions that "better capture the deteriorating performance of pools from 2006 and late 2005 with regard to continued poor loan performance and home price weakness." Fitch can be found on the Web at http://www.fitchratings.com.

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