Issuers of jumbo mortgage-backed securities have been cagey about identifying the smaller lenders that have contributed mortgages to jumbo MBS. However, Inside Nonconforming Markets has uncovered 93 lenders that participated in deals issued in the first quarter of 2014. The lenders whose loans were included in jumbo MBS in the first quarter were largely small firms that don’t attract much attention. Most of the lenders participating in jumbo MBS ... [Includes two data charts]