Fannie Mae and Freddie Mac issued $189.70 billion of single-family mortgage-backed securities during the second quarter of 2017, a 13.1 percent drop from the first three months of the year. A new ranking and analysis by Inside The GSEs reveals that much of the decline resulted from a slowdown among large banks and thrifts. The four banks with over $1 trillion in assets delivered just $43.23 billion of home loans into Fannie/Freddie MBS during the second quarter. That was down 29.1 percent from the previous period, knocking the group’s combined market share down from 27.9 percent in the first quarter to 22.8 percent.