The government-sponsored enterprises are well on their way to trimming their retained mortgage portfolios to less than $250.0 billion each by the start of 2018. As of the end of the third quarter, Fannie Mae and Freddie Mac had a combined mortgage portfolio of $615.65 billion, down 3.3 percent from June. While Freddie historically had the larger retained holdings, the two portfolios are now roughly equal. Under the current terms of their conservatorship, Fannie and Freddie are required...[Includes one data table]