Mortgage securitization rates remained at record levels through the third quarter of 2012, with 86.3 percent of primary market originations being financed as MBS, according to a new analysis by Inside MBS & ABS. A total of $1.15 trillion of MBS backed by recently originated loans were issued through the first nine months of the year, soaking up most of the $1.33 trillion in new production during that period. The market is on track to top the record 84.4 percent securitization rate set for the full year back in 2009, after two years in which the rate had drifted somewhat lower. During the third quarter, the securitization rate surged...[Includes one data chart]