April may produce the highest monthly gross MBS supply for 30-year collateral ever, and May could possibly top that figure, said analysts at Credit Suisse First Boston last week.

As of April 16, almost $26 billion has already been issued in FNMA 30-year collateral. The bank is expecting April's 30-year conventional production to be roughly at least $50 billion, exceeding the previous high in January 1999, when about $45 billion was issued.

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