An unanticipated decline in interest rates soured the hedging bets placed by Fannie Mae and Freddie Mac during the first quarter of 2016, leading to sharply lower net income at the two government-sponsored enterprises. The two GSEs booked a combined $7.37 billion in net derivative losses for the first quarter that nearly washed out income from their core businesses. Since 2012, when the two GSEs became profitable again, they have booked huge $23.46 billion in hedging losses. “As we’ve said for over a year now, our quarterly financial results are...