The total dollar volume of non-agency mortgage-backed securities backed by new originations nearly doubled in 2018, according to a new ranking and analysis by Inside Nonconforming Markets. Some $29.08 billion of non-agency MBS backed by new loans was issued in 2018, a 94.3 percent increase from 2017. Issuance of both prime non-agency MBS and expanded-credit deals hit post-crisis highs last year. Some $17.69 billion of prime non-agency ... [Includes one data chart]