Refinancing of underwater and nearly submerged Fannie Mae and Freddie Mac mortgages continued to spur business at the government-sponsored enterprises during the third quarter. During the third quarter of 2012, the two GSEs securitized a total of $66.91 billion of refinance mortgages with loan-to-value ratios exceeding 85 percent, a proxy for business originated under the Home Affordable Refinance Program. That was up 13.3 percent from the second quarter, according to an Inside MBS & ABS analysis of loan-level securitization data. Official HARP data are reported...[Includes two data charts]