“UnitedHealth Group Inc. has approached Aetna Inc. about a takeover deal that would likely be valued at more than $40 billion, … the latest move in a frenzy of merger talks in the health-insurance industry
… The approach comes as Anthem Inc., No. 2 after UnitedHealth, recently approached Cigna Corp. with a roughly $45 billion buyout offer that was rebuffed … Meanwhile, Aetna and others are considering buying Humana Inc., which is looking at strategic alternatives including a sale after fielding takeover interest[.]”