Subprime, Alt-A mortgage delinquencies rising: S&P

NEW YORK (Reuters) - Delinquencies in U.S. subprime debt and higher-quality mortgages known as Alt-A securities are continuing to increase, Standard & Poor's said on Thursday.

Delinquencies for Alt-A mortgages rated between 2005 and 2007 are climbing, with total delinquencies rising as high as 17 percent in some cases, more than 6 percentage points higher than previous estimates, the ratings agency said in a report.

Lower-quality subprime mortgage delinquencies soared as high as 37 percent for mortgages originated in 2006, 4 percentage points higher than previous estimates, S&P said.

Subprime mortgages originated in 2007 saw delinquencies climb to almost 26 percent, 6 percentage points higher.

"The 2007 issuance year continues to be the worst-performing vintage in terms of cumulative losses," S&P said, regarding subprime mortgages. "Serious delinquencies" of payments 90 days late or more and foreclosures also are rising, S&P said.

(Reporting by Walden Siew; Editing by James Dalgleish)