Nearly half of the loans securitized by Fannie Mae, Freddie Mac and Ginnie Mae during the third quarter came from lenders’ retail platforms, a new Inside Mortgage Trends analysis shows. Correspondents generated 38.8 percent of the market and posted the highest purchase-mortgage concentration, 77.8 percent. Mortgage brokers were involved in 11.6 percent of agency business, with a relatively high 35.9 percent refinance distribution ... [Includes one data chart]