The mortgage securitization rate jumped significantly higher during the third quarter of 2016, spurred by a bigger market share for Fannie Mae and Freddie Mac. A total of $416.5 billion of relatively newly-originated mortgages were included in single-family MBS issued during the third quarter, according to a new Inside MBS & ABS analysis. That figure, which excludes modified loans and most mortgages aged more than three months, represented 71.2 percent of the $585.0 billion of first-lien mortgages originated during the period. During the second quarter, the securitization rate was...[Includes one data table]