NEW YORK--(BUSINESS WIRE)--Fitch Ratings has assigned the following ratings and Rating Outlooks to one group in Citigroup Mortgage Loan Trust 2015-6: Group 1 Securities --$23,800,800 class 1A1 'BBBsf'; Outlook Stable; --$16,038,631 class 1A2 not rated. KEY RATING DRIVERS CMLTI 2015-6 is composed of two groups, and Fitch is rating one bond from one of the groups. Each group is a resecuritization of an ownership interest in residential mortgage-backed securities. As a resecuritization, the securi