According to WSJ, Aetna (AET) approached by CVS Health Corp. (CVS)

On October 26, 2017, CVS Health Corp (CVS) made an offer to acquire Aetna (AET) for more than $200 per share, or over $66 billion.

Update(s):

November 04, 2017: U.S. pharmacy operator CVS Health Corp (CVS) and health insurer Aetna Inc (AET) are working toward finalizing merger terms and announcing a deal for more than $70 billion as early as December, according to people familiar with the matter.