The retail channel remains the predominant source of jumbo originations, according to an Inside Nonconforming Markets analysis of survey responses collected by Inside Mortgage Finance. Among the top jumbo lenders, more than four out of five jumbos originated during the fourth quarter of 2016 were through the retail channel. The 81.6 percent retail share of jumbo originations was up from a 79.3 percent share in the fourth quarter of 2015 ... [Includes one data chart]