Fannie, Freddie shares jump 20% in premarket BOSTON (MarketWatch) -- Shares of mortgage-finance giants Fannie Mae (NYSE:FNM) and Freddie Mac (NYSE:FRE) were up more than 20% in premarket trading Monday. Late last week, reports surfaced that the U.S. Treasury Department has agreed to provide Fannie Mae and Freddie Mac with as much capital as they need over the next three years. The companies were placed in government conservatorship in 2008