A number of participants in the non-agency market are working to address the risks posed by second liens taken out by borrowers after the origination of the first mortgage. Some potential investors in non-agency mortgage-backed securities have balked at buying into new issuance due to concerns about borrower leverage and equity positions. “That’s a big problem for insurance companies and institutional investors, that debt can morph over time,” Fred Matera, a managing director at Redwood Trust ...