CHICAGO--(BUSINESS WIRE)--Fitch Ratings has maintained on Rating Watch Positive the 'BBB' ratings assigned to Humana Inc.'s (HUM) senior notes and the 'A' Insurer Financial Strength (IFS) ratings assigned to certain HUM subsidiaries. Today's rating action follows the completion of a periodic review of HUM's ratings. Fitch had previously placed HUM's rating on Rating Watch Positive on July 6, 2015 following the company's announcement that it had entered into a definitive agreement under which it