California continues to account for the largest share of non-agency jumbo originations but it lost some market share in 2017, according to an Inside Nonconforming Markets analysis of data from the Home Mortgage Disclosure Act. Some $317.29 billion of jumbos were originated in 2017, down 9.7 percent from the previous year. The analysis is based on originations of first-lien, single-family mortgages, with loan-limits determined at the county level. Originations of ... [Includes one data chart]