Fannie Mae and Freddie Mac lost a combined $9.2 billion during the third quarter – mostly due to writedowns on derivatives transactions – while the two government-sponsored enterprises continued to watch their massive MBS holdings decline. As of the end of September, Fannie and Freddie held a combined $754.54 billion of MBS in their retained portfolios, down 1.1 percent from the second quarter and a decline of 7.4 percent from the same July through September period last year. Fannie’s holdings of non-agency MBS fell 2.2 percent to $77.1 billion during... (Includes one data chart)