First-time homebuyers make up a significant part of the purchase-mortgage market, but Fannie Mae and Freddie Mac have a hard time competing with Ginnie Mae, according to a new Inside The GSEs analysis of loan-level data.The three agencies securitized $118.90 billion of first-time buyer mortgages during the first six months of 2015, but Ginnie accounted for over half (52.4 percent) of the business. Ginnie’s big advantage is that it gets all the FHA and VA loans, while the GSEs so far have not gotten much traction in their reduced-downpayment programs. First-time buyers typically have less savings for a downpayment and often have less-stellar credit profiles. In the first half of this year, the average loan-to-value ratio for...(charts)