Risk-retention rules proposed by federal regulators could limit a popular form of non-prime risk retention, perhaps unintentionally. The treatment of excess spread on non-agency jumbo mortgage-backed securities is also a concern. Tom Deutsch, executive director of the American Securitization Forum, warned that excess spread retained by a deal’s sponsor would not count as risk retention under the qualified residential mortgage proposed rule. In securitizations of non-prime loans, the excess spread typically would be treated as the...