Standard & Poor’s says it may downgrade some 7,077 classes of 1,384 securitizations of mortgage-backed securities after completing an update of its loss projections for bonds issued between 2005 and 2007. S&P had reviewed bonds from securitizations of prime, subprime and Alt-A mortgages, and raised its loss projections for subprime and Alt-A loans by five percentages points and for prime loans by two percentage points.

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