Redwood Trust is preparing to issue its first non-agency mortgage-backed security backed by “expanded prime” mortgages. In the second quarter, Redwood acquired approximately $240.0 million of such mortgages, which have somewhat looser underwriting standards than what’s typically seen in the jumbo MBS market. Clayton Holdings reviewed 417 mortgages for the planned issuance, according to documents filed Aug. 30 with the Securities and Exchange Commission. The total unpaid principal balance of the loans wasn’t disclosed. The deal will include...