According to GuruFocus Insider Data, these are the largest CEO sales during the past week: Amerisourcebergen, Anadarko Petrol, Comcast Corp A, Eagle Materials. Amerisourcebergen (ABC): President and CEO Steven H. Collis sold 245,258 Shares President and CEO of Amerisourcebergen (ABC) Steven H. Collis sold 245,258 shares on 03/21/2012 at an average price of $38.64.