CVS may acquire health insurer Aetna in a $66 million bid. The Wall Street Journal reported CVS offered $200 a share, which boosted Aetna's shares by 12 percent. Caremark, the benefit management subsidiary of CVS, handles prescription-drug programs for some of the biggest companies and health insurers. In the past, CVS has also bought Target's pharmacy business. "Aetna participants are likely to see the most benefit … because CVS would be maybe able to offer them lower co-pays if they shop with them." Joseph Agnese, a senior analyst at CFRA told USA Today