The serious delinquency rate on subprime mortgages continued to improve in the second quarter of 2015 while the amount of subprime mortgages outstanding also dwindled. An estimated $330.0 billion in subprime mortgages were outstanding as of the end of the second quarter of 2015, according to Inside Nonconforming Markets. The volume was down by 14.5 percent compared with the second quarter of 2014. In that time, the serious delinquency rate ... [Includes one data chart]