CHICAGO--(BUSINESS WIRE)--Fitch Ratings has placed the ratings for Cigna Corp. (CI) on Rating Watch Negative following CI's announcement that it has entered into a definitive agreement under which it will be acquired by Anthem Inc. (ANTM). In the transaction, ANTM would acquire CI in exchange for cash and ANTM stock valued at approximately $49.1 billion. Fitch rates CI's senior unsecured notes 'BBB+' and the Insurer Financial Strength ratings (IFS) of certain CI subsidiaries 'A+'. The acquisiti