CME Group will implement the following Equity Index product changes on Sunday, August 19, 2007 :

• Expand listed option contracts to include four (4) quarterly months on:
• • E-mini S&P 500 Options (ES)
  • E-mini NASDAQ-100 Options (NQ)
  • NASDAQ-100 Options (ND)
  • E-mini Russell 2000 Options (ER)

• Expand End-Of-Month options to include six (6) consecutive month options listings, from the current listing of 2 serial months for:
• • S&P 500 EOM Options (EV)
  • E-mini S&P 500 EOM Options (EW)

• Add S&P Mid-Cap 400 Options on CME Globex ^®.  See Exhibit 1 (attached) for full contract specifications.

• Change the existing CME S&P 600 Small Cap Futures contract from a full-size contract to an E-mini contract
• • Minimum tick value changes from $20 to $10
  • Multiplier is halved from 200 to 100
  • E-mini S&P 600 Small Cap futures will be fully fungible with the new “full-size” S&P 600 Small Cap futures contract (defined below) on a 5:1 basis
  • All other specifications remain as originally detailed.  Click here to see existing product specifications.

• Add a new “full-size” Small Cap S&P 600 Futures Contract (Open Outcry only) -- please refer to Exhibit 2 (attached) for detailed product specifications.  Highlights of the new contract are:
• • Multiplier is $500
  • Minimum tick value is $.05 Index Points ($25 per contract)
  • “Full-size” Small Cap S&P 600 Futures contract is fully fungible with the new E-mini S&P 600 Small Cap Futures contract (immediately above) on a 1:5 basis