Purchase mortgages accounted for a large share of the loans in prime non-agency mortgage-backed securities issued during the third quarter of 2016, according to an analysis by Inside Nonconforming Markets. Purchase mortgages accounted for 67.3 percent of the $4.07 billion in prime non-agency MBS issued during the quarter. That was the highest quarterly share for purchase mortgages since at least the first quarter of 2013. The purchase-mortgage ... [Includes two data charts]