MBS Business Surges in 1Q 2012 Due to RefiGSE single-family securitizations leapt 16.2 percent during the first three months of 2012 compared to the previous quarter as mortgage lenders delivered some $303.9 billion in home loans to Fannie Mae and Freddie Mac’s securitization programs, according to an Inside The GSEs analysis. The first quarter’s flood of new business marked the fourth straight quarterly increase in production of GSE mortgage-backed securities after the market tanked in the second quarter of 2011.