Fannie Mae and Freddie Mac trimmed their retained mortgage investment portfolios in the first quarter of 2016 by a combined 2.8 percent. The Federal Housing Finance Agency directed the government-sponsored enterprises to wind down their portfolios by 15 percent each year until they reach $250 billion by 2018. At the end of the first quarter, Fannie’s mortgage-related investment portfolio dropped to $332.6 billion, a 3.6 percent decline from December 2015. The biggest drop was in the GSE’s non-agency MBS holdings, which fell 21.3 percent in the first quarter to just $13.3 billion, roughly one tenth the amount held back in the heyday of the subprime and Alt A MBS markets. Fannie plans...[Includes one data table]