Fitch Ratings this week put out a new report detailing the latest updates to its criteria for monitoring U.S. residential MBS for possible ratings changes and to analyze re-securitizations of real estate mortgage investment conduit deals. Among the most significant revisions is a loss severity adjustment for newly-issued re-REMIC transactions. Fitch will adjust the model-projected loss severity assumption for pools backing newly issued re-REMIC transactions by as much as 10 percent to account for differences between model projections and recently observed loss severity trends, according to the report. Fitch’s RMBS loan loss model “assumes...