The number of issuers offering jumbo mortgage-backed securities will increase in 2015, according to analysts at various rating services, but total issuance volume isn’t expected to grow by much compared with this year. Attracting investors willing to purchase AAA tranches of jumbo MBS remains a key obstacle. Some $5.4 billion in jumbo MBS were issued during the first three quarters in 2014, according to Inside Nonconforming Markets, including $3.1 billion in the third quarter ...