Refinance activity continued to dominate the flow business at Fannie Mae and Freddie Mac in April, but 2015 is shaping up as a decent year for purchase mortgages as well. The two GSEs securitized $26.34 billion of purchase mortgages in April, a 24.3 percent increase from the previous month. That’s still well below the level produced in the second half of 2014, when monthly production averaged $31.79 billion. But Fannie and Freddie securitized $96.86 billion of purchase mortgages during the first four months of 2015, a 20.0 percent increase from the same period last year. The refinance business has done most of the heavy lifting this year. Refi loan securitization was up 88.7 percent on a year-to-date basis and accounted for....(includes data charts)