Holdings of non-agency mortgage-backed securities by most banks and thrifts are declining, according to a ranking and analysis by Inside Nonconforming Markets. Banks and thrifts held $63.00 billion of non-agency MBS as of the end of 2016, down 23.9 percent from the end of 2015. The holdings are concentrated among five banks, which accounted for 64.9 percent of all non-agency MBS held by the industry as of the end of 2016. JPMorgan Chase held ... [Includes one data chart]