Remember what large institutions do
In a case such as CNC, the only way in for them without substantially moving the share price is one of 2 ways. They participate in the PP and they also add during times of volatility. Pay attention to the volume the last few times. It's telling you there's a big shift in shares from the weak hands to the strong. When things get volatile the volume goes up from the buying and selling allowing them to scoop up shares and not push up the price very much. GLTA