Despite booming volume in the first quarter, fixed-rate jumbo securities are expected to slack off some given the backup in interest rates, according to the president of the nation's third-largest conduit for jumbo securitizations.

"We expect that fixed-rate business probably will slow down a little bit as rates pick up," said Michael Parker, president of PNC Mortgage Securities Corp. "We're seeing that in our mortgage company [PNC Mortgage Corp.] and expect it to come up that pipeline."

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