Fannie Mae and Freddie Mac securitized $135.69 billion of single-family purchase mortgages during the third quarter, according to a new Inside Mortgage Finance analysis of mortgage-backed securities disclosures by the two government-sponsored enterprises. That was up a hefty 26.2 percent from the previous quarter, and it represented the biggest quarterly flow of purchase mortgages to the GSEs since the housing market collapse. Although the loans were pooled in MBS issued during the third quarter, a significant number of them were actually originated during the April-June cycle. The third quarter typically has...[Includes three data tables]