While Fannie Mae and Freddie Mac stress their avoidance of new subprime and Alt A mortgages, nonprime mortgages continue to account for a small portion of the government-sponsored enterprises’ new business. According to an analysis by Inside Nonconforming Markets, Fannie’s portfolio of guaranteed subprime mortgages is declining much more rapidly than Freddie’s. Fannie guaranteed $4.30 billion in subprime mortgages as of the end of the third quarter of 2013, down 17.3 percent ... [Includes one data chart]