Fitch Ratings downgraded multiple Citigroup Mortgage RMBS series from triple-A to junk today after placing them on negative rating watch. The ratings agency made the downgrades as part of an ongoing review of prime and Alt-A RMBS transactions as the housing downturn continues to unwind. Many of the vintage 07 series involved in Citigroup’s RMBS downgrades migrated to double-C from triple-A but several made the leap to triple-C from triple-A.
