Exhibit 21.1

NYSE EURONEXT

SUBSIDIARIES AND AFFILIATES



|                                            |  |                                   
|------------------------------------------- |  | ----------------------------------
|Name                                        |  | State/Jurisdictionof Incorporation
|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                          
|Newex Corporation3                          |  | New York                          
|Newin 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 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.6                            |  | Delaware                          
|NYSE Arca Equities, Inc.7                   |  | Delaware                          
|TransactTools, Inc.2                        |  | Delaware                          
|Pacific Board of Trade7                     |  | California                        
|FINRA/NYSE Trade Reporting Facility LLC8    |  | Delaware                          
|Wombat Financial Software, Inc.9            |  | Nevada                            
|Harco Technology Ltd.10                     |  | England                           
|Wombat Financial Software Europe Limited10  |  | Northern Ireland                  
|NYSE Euronext (International) B.V.1         |  | Netherlands                       
|NYSE Euronext (Holding) N.V.11              |  | Netherlands                       
|Euronext N.V.12                             |  | Netherlands                       
|Euronext Amsterdam N.V.13                   |  | Netherlands                       
|Euronext France S.A.S.13                    |  | France                            
|Euronext Brussels S.A./N.V.14               |  | Belgium                           

| | 
| | 

| | 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 Arca Holdings, Inc.
| | - | ---------------------------------------------------

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

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

| | 9 | Wholly owned subsidiary of TransactTools, Inc.
| | - | ----------------------------------------------

| | 10 | Wholly owned subsidiary of Wombat Financial Software, Inc.
| | -- | ----------------------------------------------------------

| | 11 | Wholly owned subsidiary of NYSE Euronext (International) B.V.
| | -- | -------------------------------------------------------------

| | 12 | 97% owned subsidiary of NYSE Euronext (Holding) N.V.
| | -- | ----------------------------------------------------

| | 13 | Wholly owned subsidiary of Euronext N.V.
| | -- | ----------------------------------------





---

|                                                                                                                   |  |                                   
|------------------------------------------------------------------------------------------------------------------ |  | ----------------------------------
|Name                                                                                                               |  | State/Jurisdictionof Incorporation
|Euronext Lisbon  Sociedade Gestora de Mercados Regulamentados, S.A.13                                             |  | Portugal                          
|Euronext IFCS BVBA13                                                                                               |  | Belgium                           
|Euronext Paris S.A.15                                                                                              |  | France                            
|BlueNext S.A.16                                                                                                    |  | France                            
|Euronext Holdings UK Ltd.17                                                                                        |  | United Kingdom                    
|Euronext UK Ltd.18                                                                                                 |  | United Kingdom                    
|TransactTools Ltd.18                                                                                               |  | United Kingdom                    
|Archipelago Europe, Ltd.18                                                                                         |  | United Kingdom                    
|Euronext Indices B.V.19                                                                                            |  | Netherlands                       
|Euronext Amsterdam International B.V.19                                                                            |  | Netherlands                       
|Euronext Amsterdam Clearing & Depository N.V.19                                                                    |  | Netherlands                       
|Euronext Amsterdam Intermediary B.V.20                                                                             |  | Netherlands                       
|Euronext Real Estate S.A./N.V.21                                                                                   |  | Belgium                           
|Interbolsa  Sociedade Gestora de Sistemas de Liquidaçao e de Sistemas Centralizados de Valores Mobilarios, S.A.22 |  | Portugal                          
|Financière Montmartre23                                                                                            |  | France                            
|GL TRADE S.A.24                                                                                                    |  | France                            
|GL Multimedia@ S.A.25                                                                                              |  | France                            
|S.E.P.B. S.A.26                                                                                                    |  | France                            
|La Financière Événement26                                                                                          |  | France                            
|GL Trade Americas Inc.27                                                                                           |  | United States                     
|GL Trade Ltd28                                                                                                     |  | United Kingdom                    
|GL Trade A.G.28                                                                                                    |  | Germany                           
|GL Trade Iberica S.L.28                                                                                            |  | Spain                             
|GL Trade Suisse S.A.28                                                                                             |  | Switzerland                       
|GL Trade B.V.28                                                                                                    |  | Netherlands                       
|GL Trade Solutions PTE Ltd28                                                                                       |  | Singapore                         
|GL Trade Japan KK28                                                                                                |  | Japan                             
|GLESIA29                                                                                                           |  | Italy                             
|GL T Software Unipessoal Lda28                                                                                     |  | Portugal                          
|GL Trade South Africa PTY Ltd28                                                                                    |  | South Africa                      
|Ubitrade S.A.28                                                                                                    |  | France                            

| | 
| | 

| | 14 | 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.
| | -- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | 15 | Wholly owned subsidiary of Euronext France S.A.S.
| | -- | -------------------------------------------------

| | 16 | 60% owned by Euronext Paris S.A.
| | -- | --------------------------------

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

| | 18 | Wholly owned subsidiary of Euronext Holdings UK Ltd.
| | -- | ----------------------------------------------------

| | 19 | Wholly owned subsidiary of Euronext Amsterdam N.V.
| | -- | --------------------------------------------------

| | 20 | Wholly owned subsidiary of Euronext Amsterdam Clearing & Depository N.V.
| | -- | ------------------------------------------------------------------------

| | 21 | 99.84% owned by Euronext Brussels S.A./N.V. and 0.16% owned by Euronext Paris S.A.
| | -- | ----------------------------------------------------------------------------------

| | 22 | Wholly owned subsidiary of Euronext Lisbon  Sociedade Gestora de Mercados Regulamentados, S.A.
| | -- | -----------------------------------------------------------------------------------------------

| | 23 | 55.77% owned subsidiary of Euronext Paris S.A.
| | -- | ----------------------------------------------

| | 24 | 55.16% owned subsidiary of Financière Monmartre; 8.18% owned subsidiary of Euronext Paris S.A.
| | -- | ----------------------------------------------------------------------------------------------

| | 25 | 82.04% owned subsidiary of GL TRADE S.A.; 17.96% owned by Euronext Paris S.A.
| | -- | -----------------------------------------------------------------------------

| | 26 | Wholly owned subsidiary of Euronext Paris S.A.
| | -- | ----------------------------------------------

| | 27 | 100% owned subsidiary of GL Trade Holdings Inc.
| | -- | -----------------------------------------------

| | 28 | Wholly owned subsidiary of GL Trade S.A.
| | -- | ----------------------------------------

| | 29 | 51% owned subsidiary of GL Trade S.A.
| | -- | -------------------------------------



---

|                                                  |  |                                   
|------------------------------------------------- |  | ----------------------------------
|Name                                              |  | State/Jurisdictionof Incorporation
|GL Trade MENA30                                   |  | Tunisia                           
|Ubitrade OSI30                                    |  | Tunisia                           
|GL Trade Systems Ltd HK28                         |  | Hong Kong                         
|GL Trade Australia PTY Ltd28                      |  | Australia                         
|GL Settle Ltd28                                   |  | United Kingdom                    
|GL Trade Belgium S.A.28                           |  | Belgium                           
|GL Trade Holdings Inc28                           |  | United States                     
|GL Trade Overseas Inc.28                          |  | United States                     
|GL Settle Inc (ex OASIS)27                        |  | United States                     
|GL Bilglsayar Hizmetleri Ticaret Ltd. Sirketi28   |  | Turkey                            
|Euronext London Limited26                         |  | United Kingdom                    
|LIFFE (Holdings) plc31                            |  | United Kingdom                    
|The London Commodity Exchange 1986 Limited32      |  | United Kingdom                    
|Swapsconnect Ltd32                                |  | United Kingdom                    
|CScreen Ltd32                                     |  | United Kingdom                    
|LIFFE Ventures Inc.32                             |  | United States                     
|LIFFE Ventures II Inc.32                          |  | United States                     
|Secfinex Limited33                                |  | United Kingdom                    
|NQLX LLC34                                        |  | United States                     
|LIFFE Futures plc32                               |  | United Kingdom                    
|The London Futures and Options Exchange Limited32 |  | United Kingdom                    
|LIFFE Nominees Limited32                          |  | United Kingdom                    
|LIFFE USA Limited32                               |  | United Kingdom                    
|LIFFE Development Limited32                       |  | United Kingdom                    
|LIFFE Services Limited32                          |  | United Kingdom                    
|The Baltic Futures Exchange32                     |  | United Kingdom                    
|B.F.E. Debenture Company No. 1 Limited32          |  | United Kingdom                    
|LIFFE Options plc32                               |  | United Kingdom                    
|LIFFE Limited32                                   |  | United Kingdom                    
|LIFFE Trustees Limited32                          |  | United Kingdom                    
|London Traded Options Market Limited32            |  | United Kingdom                    
|LIFFE Administration & Management32               |  | United Kingdom                    
|Hugin Group B.V.35                                |  | Netherlands                       
|Hugin SAS36                                       |  | France                            
|Hugin AS36                                        |  | Norway                            
|Hugin Norge AS37                                  |  | Norway                            
|Hugin Online A/S37                                |  | Denmark                           
|Hugin ForetaksFakta AB37                          |  | Sweden                            
|Hugin Investor Relations Services OY37            |  | Finland                           
|Hugin AG37                                        |  | Switzerland                       

| | 
| | 

| | 30 | Wholly owned subsidiary of Ubitrade S.A.
| | -- | ----------------------------------------

| | 31 | Wholly owned subsidiary of Euronext UK Ltd.
| | -- | -------------------------------------------

| | 32 | Wholly owned subsidiary of LIFFE (Holdings) plc
| | -- | -----------------------------------------------

| | 33 | 51% owned by LIFFE (Holdings) plc
| | -- | ---------------------------------

| | 34 | 98% owned subsidiary of LIFFE Ventures Inc.; 2% owned subsidiary of LIFFE Ventures II Inc.
| | -- | ------------------------------------------------------------------------------------------

| | 35 | Wholly owned by Euronext France S.A.S.
| | -- | --------------------------------------

| | 36 | Wholly owned subsidiary of Hugin Group B.V.
| | -- | -------------------------------------------

| | 37 | Wholly owned subsidiary of Hugin AS
| | -- | -----------------------------------



---

|                                     |  |                                   
|------------------------------------ |  | ----------------------------------
|Name                                 |  | State/Jurisdictionof Incorporation
|Hugin IR Services Deutschland GmbH37 |  | Germany                           
|Hugin (U.K.) Ltd.37                  |  | United Kingdom                    
|Hugin IR Services B.V.37             |  | Netherlands                       
|Directnews AG37                      |  | Germany