The recent shift in direct mortgage sales by smaller and nonbank lenders has reduced Fannie Mae’s and Freddie Mac’s concentration risks, but the trend has led to an increase in counterparty credit risk, according to the Federal Housing Finance Agency’s official watchdog. The evaluation report issued this week by the FHFA’s Office of Inspector General said the regulator of the two government-sponsored enterprises needs to monitor Fannie’s and Freddie’s risk-management controls regarding smaller lenders and nonbanks. According to Inside Mortgage Trends, an affiliated newsletter, nonbank sellers accounted...