GSE single-family securitizations rose just under 1.0 percent during the first three months of 2013, compared to the previous quarter, yet it was the single highest level since the second quarter of 2009 as mortgage lenders delivered $355.8 billion in home loans to Fannie Mae’s and Freddie Mac’s securitization programs, according to a new Inside The GSEs analysis. Fannie and Freddie activity peaked in January with GSE volume declining slightly in both February and March. January’s huge increase compared to the previous month may reflect lenders’ intent to hold secondary market sales until the new GSE representation and warranties went into effect on Jan. 1.