A handful of banks account for a large share of the loans in prime non-agency mortgage-backed securities issued since the start of 2017, according to a new ranking and analysis by Inside Nonconforming Markets. Banks were four of the top five originators of securitized prime mortgages between January 2017 and June 2018. More precisely, these banks ranked among the top known sources of collateral for these deals. In fact, the name of the originator was ... [Includes two data charts]