Fitch Ratings released criteria for rating MBS backed by nonperforming loans late last week, saying it will cap ratings for such deals at “A” due to “the idiosyncratic and adverse-selection risk.” As mortgage performance has improved in recent years, issuance of MBS backed solely by nonperforming loans has been limited. However, Fitch said it considers a transaction as an NPL issuance if more than 10.0 percent of the collateral is 60+ days delinquent at the time of issuance. The rating service will require such MBS to meet a number of standards to receive a low investment-grade rating of “A” or “BBB,” including a sequential-pay structure and application of available funds to pay interest to the rated notes. “Absent these structural ...