Fannie Mae did a slightly better job than Freddie Mac in fending off the seasonal slump in new single-family mortgage business during the first quarter of 2016, according to a new analysis and ranking by Inside The GSEs. A stiff 11.6 percent decline in purchase-mortgage business was the major reason why total GSE production of single-family mortgage-backed securities fell 3.4 percent from the fourth quarter of 2015. Fannie and Freddie securitized $90.18 billion of refinance loans during the first three months of the year, a 1.8 percent uptick. Freddie’s total business was down 4.6 percent from the fourth quarter, while Fannie’s was off 2.5 percent. It was Fannie that boosted its refi production, by 3...