Mortgage securitization rates in 2015 are still low compared to last year, but some of the decline is likely due to the lag between primary market origination and MBS issuance. For the first six months of the year, new MBS issuance represented 73.8 percent of total originations, according to a new Inside MBS & ABS analysis. That’s down from a 75.4 percent securitization rate for all of 2014. Securitization rates are...[Includes one data table]