Rocket Mortgage was the top seller-issuer in April thanks to a 24% jump in monthly volume, while UWM slipped to second place. Newrez, Chase and Onity all posted big gains from March. (Includes two data tables.)

FICO’s CEO argued that VantageScore isn’t gaining much traction in the MBS and ABS markets, and that the only way the score will take share with GSE mortgages will be if lenders game the system.

A handful of GSE specified-pool categories based on maximum loan amounts saw increased production in the first quarter, as did MBS backed by investor loans. (Includes data table.)