Purchase mortgages accounted for 70.7 percent of prime non-agency jumbo mortgage-backed securities issued in the third quarter of 2018, according to an analysis by Inside Nonconforming Markets. The third quarter marked a post-crisis high for the purchase mortgage share of prime jumbo MBS issuance. The previous quarterly high was a 67.3 percent share in the third quarter of 2016. Some $2.51 billion of purchase mortgages were ... [Includes two data charts]