Jody Shenn / Bloomberg
About half of recent subprime and Alt-A borrowers may soon owe more on their mortgages than their houses are worth or hold minimal equity, putting $800 billion of debt at greater risk of default, according to Barclays Capital.

Subprime loans from 2006 and 2007 that exceed the value of the homes jumped 5 percentage points to 19.8 percent in the fourth quarter, and may reach 26 percent by midyear if prices drop at the same pace, Barclays analysts wrote in a report yesterday. Alt-A loans, a grade better than subprime, would grow to 23 percent from 16.3 percent.

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