Freddie Mac continued to expand its share of the GSE single-family business in November, following a strong showing the previous month, according to a new Inside The GSEs analysis of mortgage-backed securities data. The two GSEs guaranteed $79.09 billion in new single-family MBS last month, an unexpected 4.5 percent increase from October’s production. Freddie posted the biggest increase, 7.4 percent for the month, while Fannie issuance in November was up a more modest 2.0 percent. That pushed Freddie’s share of the GSE single-family MBS business to 47.0 percent, up from 45.7 percent in October, matching the company’s biggest market share since July 2015. Through the first nine months of 2017, Freddie managed to garner...