Originations of interest-only mortgages by lenders that are prominent in the niche have lagged behind overall mortgage production trends, according to a new ranking and analysis by Inside Nonconforming Markets. Through the first three quarters of 2015, first-lien IO originations by a group of 12 lenders increased by 13.2 percent compared with the same period in 2014. Overall mortgage production in that time increased by 42.9 percent, according to ... [Includes one data chart]