The residential MBS issued in 2013 equaled 78.5 percent of primary market originations, the highest securitization rate since 2010, according to a new Inside MBS & ABS analysis. The mortgage securitization rate typically moves higher when primary-market originations are declining because of the time lag between loan closing and MBS issuance. Last year started with a bang – $560 billion in new originations – and ended with a whimper, $305 billion. In the conventional conforming market, Fannie Mae and Freddie Mac MBS issuance – even after excluding loans that were more than three months old when they were securitized – represented...[Includes one data chart]