The share of new home mortgage originations packaged into MBS drifted slightly lower in the first quarter of 2016, a new Inside MBS & ABS analysis reveals. Some $255.7 billion of newly originated mortgages were pooled in MBS in the first three months of the year, representing a paltry 67.3 percent of the estimated $380 billion of first-lien originations in the primary market. For the purposes of calculating securitization rates, loans aged more than three months and modified loans are excluded from agency MBS issuance figures. Fannie Mae and Freddie Mac securitized...[Includes one data table]