HARTFORD, Conn. & LOUISVILLE, Ky.--(BUSINESS WIRE)--Aetna (NYSE: AET) and Humana Inc. (NYSE: HUM) today announced that they have entered into a definitive agreement under which Aetna will acquire all outstanding shares of Humana for a combination of cash and stock valued at $37 billion or approximately $230 per Humana share based on the closing price of Aetna common shares on July 2, 2015. The complementary combination brings together Humana’s growing Medicare Advantage business with Aetna’s di