Issuance of non-agency MBS backed by newly originated home loans remains well below levels seen before the financial crisis. While new regulations have stopped some pre-crisis loan types from being originated, industry participants suggest that other major factors are also limiting the supply of loans available for MBS. Chris Helwig, a managing director at Amherst Pierpont, noted that banks are competing for prime jumbos and holding them in portfolio, and many borrowers who previously might have received subprime mortgages opt for FHA loans. “All that is left for non-agency MBS is...