Prepayment of loans in prime non-agency residential mortgage-backed agencies has accelerated faster than other types of loans in January, according to Royal Bank of Scotland. RBS analysts said prepayment speeds on 2005 and 2004 vintage RMBS grew by 10 basis points and 9bps, respectively, between December and January. Rates on Alt-A and subprime vintage were up only slightly while those on opt-A loans were flat.

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