Large servicers of jumbo mortgages continued to increase their holdings in the first quarter of 2017, according to a new ranking and analysis by Inside Nonconforming Markets. And delinquency performance improved on already low levels. The unpaid principal balance of jumbo mortgages serviced by a group of 30 companies hit $935.70 billion at the end of the first quarter of 2017, up 1.6 percent from the previous quarter and up 8.4 percent ... [Includes one data chart]