Issuance of non-agency mortgage-backed securities backed by new originations increased on an annual basis in 2017, with gains from prime jumbo MBS and expanded-credit MBS, according to a new ranking and analysis by Inside Nonconforming Markets. A total of $10.88 billion of prime jumbo MBS was issued during the year, up 16.7 percent from 2016. Expanded-credit MBS – which include mortgages with alternative documentation, non-qualified ... [Includes one data chart]