Exhibit 21

NYSE EURONEXT

SUBSIDIARIES AND AFFILIATES



|                                                                     |  |                                   
|-------------------------------------------------------------------- |  | ----------------------------------
|Name                                                                 |  | State/Jurisdiction ofIncorporation
|NYSE Group, Inc.1                                                    |  | Delaware                          
|New York Stock Exchange LLC2                                         |  | New York                          
|NYSE Market, Inc.3                                                   |  | Delaware                          
|NYSE Regulation, Inc.3                                               |  | New York                          
|Stock Clearing Corporation3                                          |  | New York                          
|Securities Industry Automation Corporation3                          |  | New York                          
|NYSE TransactTools, Inc.4                                            |  | New York                          
|Archipelago Holdings, Inc.2                                          |  | Delaware                          
|Archipelago Trading Services, Inc.5                                  |  | Florida                           
|Archipelago Direct, L.L.C.5                                          |  | Delaware                          
|NYSE Liffe LLC6                                                      |  | Delaware                          
|NYSE Liffe Holdings LLC1                                             |  | Delaware                          
|NYSE Arca, L.L.C.5                                                   |  | Delaware                          
|Archipelago Market Data Services, L.L.C.5                            |  | Delaware                          
|Archipelago Securities, L.L.C.5                                      |  | Delaware                          
|NYSE Arca Holdings, Inc.5                                            |  | Delaware                          
|NYSE Arca, Inc.7                                                     |  | Delaware                          
|NYSE Arca Equities, Inc.8                                            |  | Delaware                          
|NYSE Technologies, Inc.2                                             |  | Delaware                          
|FINRA/NYSE Trade Reporting Facility LLC9                             |  | Delaware                          
|Wombat Financial Software, Inc.10                                    |  | Delaware                          
|Harco Technology Ltd.11                                              |  | England                           
|Wombat Financial Software Europe Limited11                           |  | Northern Ireland                  
|NYSE Alternext US LLC2                                               |  | Delaware                          
|Amex ETF Services LLC12                                              |  | Delaware                          
|American Stock Exchange Clearing LLC12                               |  | Delaware                          
|PDR Services LLC12                                                   |  | Delaware                          
|Amex Asset LLC12                                                     |  | Delaware                          
|Amex Commodities LLC12                                               |  | Delaware                          
|Amex International LLC12                                             |  | Delaware                          
|American Stock Exchange Realty Associates LLC12                      |  | Delaware                          
|Amex Realty Manager, Inc.13                                          |  | Delaware                          
|Amex Realty Borrower, LLC14                                          |  | Delaware                          
|NYSE Euronext (International) B.V.1                                  |  | Netherlands                       
|NYSE Euronext (Holding) N.V.15                                       |  | Netherlands                       
|Euronext N.V.16                                                      |  | Netherlands                       
|Euronext Amsterdam N.V.17                                            |  | Netherlands                       
|Euronext France (Holding) S.A.S.17                                   |  | France                            
|Euronext Brussels S.A./N.V.18                                        |  | Belgium                           
|Euronext LisbonSociedade Gestora de Mercados Regulamentados, S.A.17 |  | Portugal                          
|Euronext IFCS BVBA17                                                 |  | Belgium                           
|Euronext Paris S.A.19                                                |  | France                            
|BlueNext S.A.20                                                      |  | France                            
|Euronext Holdings U.K. Limited.17                                    |  | United Kingdom                    
|Euronext U.K. Limited.22                                             |  | United Kingdom                    



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|                                                                                                                 |  |                                   
|---------------------------------------------------------------------------------------------------------------- |  | ----------------------------------
|Name                                                                                                             |  | State/Jurisdiction ofIncorporation
|TransactTools Limited.22                                                                                         |  | United Kingdom                    
|Archipelago Europe, Limited.22                                                                                   |  | United Kingdom                    
|Euronext Indices B.V.23                                                                                          |  | Netherlands                       
|Euronext Amsterdam International B.V.23                                                                          |  | Netherlands                       
|Euronext Amsterdam Clearing & Depository N.V.23                                                                  |  | Netherlands                       
|Euronext Amsterdam Intermediary B.V.24                                                                           |  | Netherlands                       
|Euronext Real Estate S.A./N.V.25                                                                                 |  | Belgium                           
|InterbolsaSociedade Gestora de Sistemas de Liquidaçao e de Sistemas Centralizados de Valores Mobilarios, S.A.26 |  | Portugal                          
|S.E.P.B. S.A.19                                                                                                  |  | France                            
|La Financière Événement19                                                                                        |  | France                            
|Euronext London Limited21                                                                                        |  | United Kingdom                    
|LIFFE (Holdings) plc27                                                                                           |  | United Kingdom                    
|The London Commodity Exchange (1986) Limited28                                                                   |  | United Kingdom                    
|Swapsconnect Limited28                                                                                           |  | United Kingdom                    
|CScreen Ltd28                                                                                                    |  | United Kingdom                    
|LIFFE Ventures Inc.28                                                                                            |  | Delaware                          
|LIFFE Ventures II Inc.28                                                                                         |  | Delaware                          
|Secfinex Limited29                                                                                               |  | United Kingdom                    
|NQLX LLC30                                                                                                       |  | Delaware                          
|LIFFE Futures plc28                                                                                              |  | United Kingdom                    
|The London Futures and Options Exchange Limited28                                                                |  | United Kingdom                    
|LIFFE (Nominees) Limited28                                                                                       |  | United Kingdom                    
|LIFFE USA Limited28                                                                                              |  | United Kingdom                    
|LIFFE Development Limited28                                                                                      |  | United Kingdom                    
|LIFFE Services Limited28                                                                                         |  | United Kingdom                    
|The Baltic Futures Exchange28                                                                                    |  | United Kingdom                    
|B.F.E. Debenture Company No.1 Limited28                                                                          |  | United Kingdom                    
|LIFFE Options plc28                                                                                              |  | United Kingdom                    
|LIFFE Limited28                                                                                                  |  | United Kingdom                    
|LIFFE Trustees Limited28                                                                                         |  | United Kingdom                    
|London Traded Options Market Limited28                                                                           |  | United Kingdom                    
|LIFFE Administration & Management28                                                                              |  | United Kingdom                    
|Hugin Group B.V.19                                                                                               |  | Netherlands                       
|Hugin SAS31                                                                                                      |  | France                            
|Hugin AS31                                                                                                       |  | Norway                            
|Hugin Norge AS32                                                                                                 |  | Norway                            
|Hugin Online A/S32                                                                                               |  | Denmark                           
|Hugin ForetaksFakta AB32                                                                                         |  | Sweden                            
|Hugin Investor Relations Services OY32                                                                           |  | Finland                           
|Hugin AG32                                                                                                       |  | Switzerland                       
|Hugin IR Services Deutschland GmbH32                                                                             |  | Germany                           
|Hugin (U.K.) Ltd.32                                                                                              |  | United Kingdom                    
|Hugin IR Services B.V.32                                                                                         |  | Netherlands                       
|Hugin Germany AG32                                                                                               |  | Germany                           
|Imperium Centre Limited33                                                                                        |  | United Kingdom                    
|Smartpool Holdings Limited34                                                                                     |  | United Kingdom                    
|Smartpool Trading Limited35                                                                                      |  | United Kingdom                    
|NYSE Euronext Technology Holding S.A.S.19                                                                        |  | France                            
|Atos Euronext Market Solutions Inc.36                                                                            |  | New York                          
|NYSE Technologies IPR Limited36                                                                                  |  | United Kingdom                    



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|                                        |  |                                   
|--------------------------------------- |  | ----------------------------------
|Name                                    |  | State/Jurisdiction ofIncorporation
|NYSE Technologies Limited36             |  | United Kingdom                    
|NYSE Euronext Technology S.A.S.36       |  | France                            
|NYSE Euronext Technology Connect B.V.36 |  | Netherlands                       
|NYSE Euronext Technology S.A./N.V.36    |  | Belgium                           
|Prime Source (NYSE Euronext) Limited28  |  | United Kingdom                    
|NYSE IP LLC                             |  | Delaware                          
|Wall and Broad Insurance Company1       |  | New York                          



|1 | Wholly owned subsidiary of NYSE Euronext
|- | ----------------------------------------



|2 | Wholly owned subsidiary of NYSE Group, Inc.
|- | -------------------------------------------



|3 | Wholly owned subsidiary of New York Stock Exchange LLC
|- | ------------------------------------------------------



|4 | Wholly owned subsidiary of Securities Industry Automation Corporation
|- | ---------------------------------------------------------------------



|5 | Wholly owned subsidiary of Archipelago Holdings, Inc.
|- | -----------------------------------------------------



|6 | Wholly owned subsidiary of NYSE LIFFE Holdings LLC.
|- | ---------------------------------------------------



|7 | Wholly owned subsidiary of NYSE Arca Holdings, Inc.
|- | ---------------------------------------------------



|8 | Wholly owned subsidiary of NYSE Arca, Inc.
|- | ------------------------------------------



|9 | Wholly owned subsidiary of NYSE Market, Inc.
|- | --------------------------------------------



|10 | Wholly owned subsidiary of NYSE Technologies, Inc.
|-- | --------------------------------------------------



|11 | Wholly owned subsidiary of Wombat Financial Software, Inc.
|-- | ----------------------------------------------------------



|12 | Wholly owned subsidiary of NYSE Alternext US LLC
|-- | ------------------------------------------------



|13 | Wholly owned subsidiary of American Stock Exchange Realty Associates LLC
|-- | ------------------------------------------------------------------------



|14 | 99.99% owned by American Stock Exchange Realty Associates LLC and 0.01% owned by Amex Realty Manager, Inc.
|-- | ----------------------------------------------------------------------------------------------------------



|15 | Wholly owned subsidiary of NYSE Euronext (International) B.V.
|-- | -------------------------------------------------------------



|16 | 99.35% owned subsidiary of NYSE Euronext (Holding) N.V.; 0.62%
owned by Euronext Paris S.A.; 0.03% owned by Euronext N.V.
|-- | -------------------------------------------------------------------------------------------------------------------------



|17 | Wholly owned subsidiary of Euronext N.V.
|-- | ----------------------------------------



|18 | 80% owned subsidiary of Euronext N.V.; 19% owned subsidiary of
Euronext Paris S.A.; 1% owned subsidiary of Euronext LisbonSociedade Gestora de Mercados Regulamentados, S.A.
|-- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|19 | Wholly owned subsidiary of Euronext France S.A.S.
|-- | -------------------------------------------------



|20 | 60% owned by Euronext Paris S.A.
|-- | --------------------------------



|21 | Wholly owned subsidiary of Euronext Paris S.A.
|-- | ----------------------------------------------



|22 | Wholly owned subsidiary of Euronext Holdings U.K. Ltd.
|-- | ------------------------------------------------------



|23 | Wholly owned subsidiary of Euronext Amsterdam N.V.
|-- | --------------------------------------------------



|24 | Wholly owned subsidiary of Euronext Amsterdam Clearing and Depository N.V.
|-- | --------------------------------------------------------------------------



|25 | 99.84% owned subsidiary of Euronext Brussels S.A./N.V. and 0.16% are owned by Euronext Paris S.A.
|-- | -------------------------------------------------------------------------------------------------



|26 | Wholly owned subsidiary of Euronext LisbonSociedade Gestora de Mercados Regulamentados, S.A.
|-- | ---------------------------------------------------------------------------------------------



|27 | Wholly owned subsidiary of Euronext U.K. Ltd.
|-- | ---------------------------------------------



|28 | Wholly owned subsidiary of LIFFE (Holdings) plc
|-- | -----------------------------------------------



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|29 | 56.51% owned by LIFFE (Holdings) plc
|-- | ------------------------------------



|30 | 98% owned subsidiary of LIFFE Ventures Inc.; 2% owned subsidiary of LIFFE Ventures II Inc.
|-- | ------------------------------------------------------------------------------------------



|31 | Wholly owned subsidiary of Hugin Group B.V.
|-- | -------------------------------------------



|32 | Wholly owned subsidiary of Hugin AS
|-- | -----------------------------------



|33 | Wholly owned subsidiary of Euronext Holdings U.K. Ltd
|-- | -----------------------------------------------------



|34 | 72.83% owned by Euronext Holdings U.K. Ltd
|-- | ------------------------------------------



|35 | Wholly owned subsidiary of SmartPool Holding Limited
|-- | ----------------------------------------------------



|36 | Wholly owned subsidiary of NYSE Euronext Technology Holding S.A.S.
|-- | ------------------------------------------------------------------