DBRS and Standard & Poor’s separately issued revised criteria for rating non-agency mortgage-backed securities in recent weeks. DBRS will give slightly more credit to jumbo MBS due to strong performance in recent years, while S&P adjusted modeling relating to home price trends. DBRS noted that from 2010 through the end of April, $32.1 billion in jumbo MBS had been issued, with only one deal taking any losses to date, a 0.04 percent loss. “Positive loan attributes ...