Exhibit 21.1

Subsidiaries of Chicago Mercantile Exchange Holdings Inc.

Name of Subsidiary	Jurisdiction of Incorporation or Organization
CME Alternative Marketplace Inc.	Delaware
CME FX Marketplace Inc.	Delaware
CME Global Marketplace Inc.	Delaware
CME Swaps Marketplace Inc.	United Kingdom
Chicago Mercantile Exchange Inc.	Delaware
GFX Corporation	Illinois
Special Technology Investments Limited	United Kingdom
Swapstream Limited	United Kingdom
Swapstream Operating Services Limited	United Kingdom
Swapstream SAS	France