A strong first half of 2015 helped the issuance of jumbo mortgage-backed securities top the volume seen in 2014, according to a new analysis by Inside Nonconforming Markets. But as the year progressed, issuance slowed and industry analysts don’t expect much of an increase in volume in 2016. Some $12.08 billion in jumbo MBS were issued in 2015, up 25.4 percent compared with 2014 but not enough to match the $13.12 billion in 2013 issuance. And jumbo MBS activity ... [Includes one data chart]