Non-agency MBS issuance hit its highest level since the third quarter of 2007, largely because of surging production of the new generation of Alt A and subprime deals. JPMorgan Chase was the top issuer and top underwriter in the first quarter. (Includes three data tables.)
Some 68.0% of mortgages originated in 2025 were sold into MBS. Securitization rates were stable across most products, except for expanded-credit mortgages, where the securitization rate increased sharply. (Includes data table.)