Fannie Mae and Freddie Mac issued $57.9 billion in single-family mortgage-backed securities during the month of July, a 12 percent increase from June, continuing an off-and-on monthly rebound that started in April, according to a new Inside The GSEs analysis.However, MBS issuance through the first seven months of 2014 was down 59.0 percent from the same period a year ago Top-ranked Wells Fargo’s Fannie and Freddie securitization, at $7.91 billion, rose by 8.5 percent on a monthly basis but dropped 71.6 percent year-to-date.