The credit quality of the collateral backing the most active types of structured finance securities is slipping, but remains above pre-credit crisis levels, according to Moody’s Investors Service. In a report issued last week, Moody’s cited several trends that signal the potential for higher credit risk, but the rating service said that many sponsors are building in subordination levels and other structural features that result in higher credit quality. “The degree of weaker underwriting and collateral quality in structured transactions varies...