CHICAGO--(BUSINESS WIRE)--Fitch Ratings has placed Anthem Inc.'s (ANTM) ratings on Rating Watch Negative. The rating action follows today's announcement by ANTM that it has entered into a definitive agreement to acquire Cigna Corp. (CI) for cash and stock valued at approximately $49.1 billion. The acquisition is expected to close in the second half 2016. KEY RATING DRIVERS Today's rating action reflects the negative effect the acquisition will have on ANTM's financial leverage metrics and poten