Chicago mercantile exchange? (CME) is the largest futures exchange in the United States and the second largest exchange in the world for buying and selling futures and futures option contracts. The Chicago Mercantile Exchange provides investors with many financial and agricultural transactions. Since the establishment of 1898, the Chicago Mercantile Exchange has continuously provided the market with risk management tools to protect investors from the risks brought about by the price changes of financial products and tangible goods, and to give them opportunities to profit from trading.