Nonbank seller-servicers continued to claim a larger share of Fannie Mae and Freddie Mac business during the booming second quarter of 2015, according to a new Inside The GSEs analysis.The two GSEs securitized $232.4 billion of single-family mortgages during the second quarter, up 22.3 percent from the first three months of the year. Freddie posted a bigger gain, 28.5 percent, than did Fannie (up 18.0 percent). Nonbank sellers accounted for 46.5 percent of loans securitized by the GSEs during the second quarter. They delivered $107.9 billion to Fannie and Freddie mortgage-backed securities during the period, up 24.7 percent from the first quarter. Among nonbank sellers, the biggest gain was posted by smaller and mid-sized mortgage companies, which accounted for 27.6 percent of GSE second-quarter business.