Update # 2 New Product Summary for Quote Vendors - S&P 500 Weekly Options (E-mini & Standard) -Effective Sunday, August 23, 2009

CME Group is the world’s leading derivatives marketplace. The company is comprised of four Designated Contract Markets (DCMs). 
Further information on each exchange's rules and product listings can be found by clicking on the links to CME, CBOT, NYMEX and COMEX.