Exhibit 21.1

Subsidiaries of CME Group Inc.

Subsidiary Name

Jurisdiction of Incorporation or Organization

Board of Trade of the City of Chicago, Inc. CBOT Singapore PTE. LTD. C-B-T Corporation Chicago Mercantile Exchange Inc. Chicago Mercantile Exchange Korea Inc. Chicago Mercantile Exchange Luxembourg Holdings S.A.R.L. Chicago Mercantile Exchange Luxembourg S.A.R.L. GFX Corporation CME Alternative Marketplace Inc. CME FX Marketplace Inc. CME Global Marketplace Inc. CME Group Index Holdings LLC CME Group Index Services LLC CME Group Marketing Canada CME Group Strategic Investments LLC CMEG Brazil Investments 1 LLC CMEG Brazil Investments 2 LLC CMEG Brazil 1 Participações Ltda. CMEG Brazil Sistemas Locação de Bens Ltda. CMEG Strategic Sdn. Bhd. CMEG NYMEX Holdings Inc. CME Clearing Europe Limited CME Marketing Europe Limited (f/k/a Swapstream Operating Services Limited) CME Swaps Marketplace Ltd. CMESCC Inc. Commodity Exchange, Inc. COMEX Clearing Association, Inc. Credit Market Analysis Limited Credit Market Analysis USA Inc Financial Data Exchange Limited Giotto Empreendimentos e Participações Ltda. NYMEX Europe Exchange Holdings Limited NYMEX Europe Limited NYMEX London Limited NYMEX Technology Corp. New York Mercantile Exchange, Inc. Quotevision Limited Swapstream Limited Swapstream Inc. Special Technology Investments Limited Swapstream France (f/k/a IT4F) Tradingear Acquisition, LLC

Delaware Singapore Delaware Delaware Korea Luxembourg Luxembourg Illinois Delaware Delaware Delaware Delaware Delaware Canada Delaware Delaware Delaware Brazil Brazil Malaysia Delaware United Kingdom United Kingdom United Kingdom Delaware New York New York United Kingdom Delaware United Kingdom Brazil United Kingdom United Kingdom United Kingdom Delaware Delaware United Kingdom United Kingdom Delaware United Kingdom France Delaware