First-lien portfolio holdings continued to increase in the third quarter of 2015, according to a new Inside Nonconforming Markets analysis of bank and thrift call reports. Banks and thrifts held $1.85 trillion in first-lien mortgages in portfolio at the end of September, up 0.3 percent compared with the end of the second quarter and a 2.8 percent increase compared with the third quarter of 2014. Wells Fargo had the largest portfolio at $266.3 billion as of ... [Includes one data chart]