Some issuers of jumbo mortgage-backed securities consistently produce riskier pools of loans than others, according to a report by Moody's Investors Service.

"Credit quality varies significantly among the jumbo mortgage pools securitized by the major MBS issuers," the report said, listing PNC Mortgage Securities, Residential Funding Corp., Citicorp Mortgage, First Union Mortgage Loan Conduit, and ABN Amro among the issuers of riskier pools of loans.

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