Seems two officers of the CMEGroup cashed in some stock options in January, prior to a short term drop in CMEGroup prices. On Jan. 15, Bryan Durkin, managing director and chief operating officer exercised options and then sold 1,500 shares of CME Group stock at $616.75, for a cool $925,125. Phupinder Gill, CME Group president sold 1,000 shares of stock at $607.25 for a total of $607,250. Today's price closed at $629.