acquisition, Aetna, buyout, California, Health Insurance, Humana, Individual Health, medicare, merger, purchase, Small Group Aetna To Buy Humana for $37B Less than 24 hours after it was announced that Centene was buying Health Net, Aetna announced the purchase of Humana. I wonder how much longer Cigna can hold off Anthem.Let the consolidations continue!Insurer Aetna to buy Humana in $37B dealDave Tweet