Exhibit 21.1

NYSE EURONEXT

SUBSIDIARIES AND AFFILIATES



|                                              |  |                                    
|--------------------------------------------- |  | -----------------------------------
|Name                                          |  | State/Jurisdiction of Incorporation
|NYSE Group, Inc.(1)                           |  | Delaware                           
|New York Stock Exchange LLC(2)                |  | New York                           
|NYSE Market, Inc.(3)                          |  | Delaware                           
|NYSE Regulation, Inc.(3)                      |  | New York                           
|Stock Clearing Corporation(3)                 |  | New York                           
|Newex Corporation(3)                          |  | New York                           
|Newin Corporation(3)                          |  | New York                           
|New York Stock Exchange, Inc.(3)              |  | Connecticut                        
|New York Stock Exchange(3)                    |  | New Jersey                         
|NYSE Market LLC(4)                            |  | Delaware                           
|Securities Industry Automation Corporation(3) |  | New York                           
|Sector, Inc.(5)                               |  | New York                           
|Archipelago Holdings, Inc.(2)                 |  | Delaware                           
|ARCAGNC Acquisition, L.L.C.(6)               |  | Delaware                           
|Archipelago Trading Services, Inc.(7)         |  | Florida                            
|Archipelago Direct, L.L.C.(6)                 |  | Delaware                           
|Archipelago Europe, Ltd(6)                    |  | England & Wales                    
|NYSE Arca, L.L.C.(6)                          |  | Delaware                           
|Archipelago Market Data Services, L.L.C.(6)   |  | Delaware                           
|Archipelago Securities, L.L.C.(6)             |  | Delaware                           
|NYSE Arca Holdings, Inc.(6)                   |  | Delaware                           
|NYSE Arca, Inc.(8)                            |  | Delaware                           
|NYSE Arca Equities, Inc.(9)                   |  | Delaware                           
|Pacific Clearing Corporation(8)               |  | California                         
|Pacific Board of Trade(8)                     |  | California                         
|NYSE Euronext (International) B.V.(1)         |  | The Netherlands                    
|NYSE Euronext (Holding) N.V.(11)              |  | The Netherlands                    
|NASD/NYSE Trade Reporting Facility LLC(4)     |  | Delaware                           
|NYSE TransactTools, Inc.(2)                   |  | Delaware                           

---

|(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 NYSE Market, Inc.
|--- | --------------------------------------------

|(5) | Wholly owned subsidiary of Securities Industry Automation Corporation
|--- | ---------------------------------------------------------------------

|(6) | Wholly owned subsidiary of Archipelago Holdings, Inc.
|--- | -----------------------------------------------------

|(7) | Wholly owned subsidiary of ARCA?GNC Acquisition, L.L.C.
|--- | -------------------------------------------------------

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

|(9) | Wholly owned subsidiary of NYSE Arca, Inc.
|--- | ------------------------------------------

|(10) | Wholly owned subsidiary of NYSE Euronext, Inc.
|---- | ----------------------------------------------

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



1



---

|                                                                                                                     |  |                                    
|-------------------------------------------------------------------------------------------------------------------- |  | -----------------------------------
|Name                                                                                                                 |  | State/Jurisdiction of Incorporation
|Euronext N.V.                                                                                                        |  | Netherlands                        
|Euronext Amsterdam N.V.(10)                                                                                          |  | Netherlands                        
|Euronext Brussels S.A./N.V.(11)                                                                                      |  | Belgium                            
|Euronext Lisbon - Sociedade Gestora de Mercados Regulamentados, S.A.(11)                                             |  | Portugal                           
|Euronext Paris S.A.(10)                                                                                              |  | France                             
|MBE Holding S.p.A.(12)                                                                                               |  | Italy                              
|Euronext UK plc(10)                                                                                                  |  | United Kingdom                     
|Euronext Indices B.V.(13)                                                                                            |  | Netherlands                        
|Euronext Amsterdam International B.V.(13)                                                                            |  | Netherlands                        
|Euronext Amsterdam Clearing & Depository N.V.(13)                                                                    |  | Netherlands                        
|Euronext Amsterdam Intermediary B.V.(14)                                                                             |  | Netherlands                        
|Euronext Real Estate S.A./N.V.(15)                                                                                   |  | Belgium                            
|Interbolsa - Sociedade Gestora de Sistemas de Liquidaçao e de Sistemas Centralizados de Valores Mobilarios, S.A.(16) |  | Portugal                           
|Financière Montmartre(17)                                                                                            |  | France                             
|GL TRADE S.A.(18)                                                                                                    |  | France                             
|GL Multimedia@ S.A.(19)                                                                                              |  | France                             
|S.E.P.B. S.A.(20)                                                                                                    |  | France                             
|La Financière Événement(20)                                                                                          |  | France                             
|GL Trade Americas Inc.(21)                                                                                           |  | United States                      
|GL Trade Ltd(22)                                                                                                     |  | United Kingdom                     
|GL Trade A.G.(22)                                                                                                    |  | Germany                            
|GL Trade Iberica S.L.(22)                                                                                            |  | Spain                              
|GL Trade Schweiz A.G.(23)                                                                                            |  | Switzerland                        
|GL Trade B.V.(22)                                                                                                    |  | Netherlands                        
|GL Trade Solutions PTE Ltd(22)                                                                                       |  | Singapore                          
|GL Trade Japan KK(22)                                                                                                |  | Japan                              
|GLESIA(24)                                                                                                           |  | Italy                              
|GL T Software Unipessoal Lda(22)                                                                                     |  | Portugal                           
|GL Trade South Africa PTY Ltd(22)                                                                                    |  | South Africa                       
|Ubitrade(22)                                                                                                         |  | France                             
|GL Trade Systems Ltd(22)                                                                                             |  | China                              
|GL Trade Australia PTY Ltd(22)                                                                                       |  | Australia                          
|4 D Trading(22)                                                                                                      |  | United Kingdom                     

---

|(10) | Wholly owned subsidiary of Euronext N.V.
|---- | ----------------------------------------

|(11) | 77 % owned subsidiary of Euronext N.V.; 22% owned subsidiary of Euronext Paris S.A; 1 % owned
subsidiary Euronext Lisbon.
|---- | -------------------------------------------------------------------------------------------------------------------------

|(12) | 51% owned subsidiary of Euronext N.V.
|---- | -------------------------------------

|(13) | Wholly owned subsidiary of Euronext Amsterdam N.V.
|---- | --------------------------------------------------

|(14) | Wholly owned subsidiary of Euronext Amsterdam Clearing & Depository N.V.
|---- | ------------------------------------------------------------------------

|(15) | 100% owned subsidiary of Euronext Brussels S.A./N.V.
|---- | ----------------------------------------------------

|(16) | Wholly owned subsidiary of Euronext Lisbon ? Sociedade Gestora de Mercados Regulamentados, S.A.
|---- | -----------------------------------------------------------------------------------------------

|(17) | 55.76% owned subsidiary of Euronext Paris S.A.
|---- | ----------------------------------------------

|(18) | 55.3% owned subsidiary of Financière Montmartre; 9.86% owned subsidiary of Euronext Paris S.A.
|---- | ----------------------------------------------------------------------------------------------

|(19) | 82% owned subsidiary of GL TRADE S.A.; 17.96% owned by Euronext Paris S.A.
|---- | --------------------------------------------------------------------------

|(20) | Wholly owned subsidiary of Euronext Paris S.A.
|---- | ----------------------------------------------

|(21) | 100% owned subsidiary of GL Trade Holdings Inc
|---- | ----------------------------------------------

|(22) | Wholly owned subsidiary of GL Trade S.A.
|---- | ----------------------------------------

|(23) | 97% owned subsidiary of GL Trade S.A.
|---- | -------------------------------------

|(24) | 51% owned subsidiary of GL Trade
S.A.
|---- | -------------------------------------



2



---

|                                                    |  |                                    
|--------------------------------------------------- |  | -----------------------------------
|Name                                                |  | State/Jurisdiction of Incorporation
|GL Settle Ltd(22)                                   |  | United Kingdom                     
|GL Trade Belgium S.A.(25)                           |  | Belgium                            
|GL Trade Holdings Inc(22)                           |  | United States                      
|GL Settle Inc (ex OASIS)(26)                        |  | United States                      
|MTS S.p.A.(27)                                      |  | Italy                              
|MTS Next Ltd(28)                                    |  | United Kingdom                     
|EuroMTS Ltd(29)                                     |  | United Kingdom                     
|MTS Deutschland A.G.(29)                            |  | Germany                            
|BondVision S.p.A.(30)                               |  | Italy                              
|Euronext London Limited(20)                         |  | United Kingdom                     
|La Financière de lOctet(20)                        |  | France                             
|LIFFE (Holdings) plc(31)                            |  | United Kingdom                     
|The London Commodity Exchange 1986 Limited(32)      |  | United Kingdom                     
|Swapsconnect Ltd(32)                                |  | United Kingdom                     
|CScreen Ltd(32)                                     |  | United Kingdom                     
|LIFFE Ventures Inc.(32)                             |  | United States                      
|LIFFE Ventures II Inc.(32)                          |  | United States                      
|NQLX LLC(33)                                        |  | United States                      
|LIFFE Futures plc(32)                               |  | United Kingdom                     
|The London Futures and Options Exchange Limited(32) |  | United Kingdom                     
|LIFFE Nominees Limited(32)                          |  | United Kingdom                     
|LIFFE USA Limited(32)                               |  | United Kingdom                     
|LIFFE Development Limited(32)                       |  | United Kingdom                     
|LIFFE Services Limited(32)                          |  | United Kingdom                     
|The Baltic Futures Exchange(32)                     |  | United Kingdom                     
|B.F.E. Debenture Company N.1 Limited(32)            |  | United Kingdom                     
|LIFFE Options plc(33)                               |  | United Kingdom                     
|LIFFE Limited(33)                                   |  | United Kingdom                     
|LIFFE Trustees Limited(33)                          |  | United Kingdom                     
|London Traded Options Market Limited(33)            |  | United Kingdom                     
|LIFFE Administration & Management(33)               |  | United Kingdom                     
|Companynews S.A.(10)                                |  | France                             
|Hugin AS(10)                                        |  | Norway                             
|Hugin Norge AS(34)                                  |  | Norway                             
|Hugin Online A/S(3)                                 |  | Denmark                            
|Hugin ForetaksFakta AB(34)                          |  | Sweden                             
|Hugin Investor Relations Services OY(34)            |  | Finland                            
|Hugin AG(34)                                        |  | Switzerland                        
|Hugin IR Services Deutchland GmbH(34)               |  | Germany                            
|Hugin Ltd.(34)                                      |  | United Kingdom                     
|Hugin IR Services B.V.(34)                          |  | Netherlands                        
|Directnews AG(34)                                   |  | Germany                            

---

|(25) | 98% owned subsidiary of GL Trade
S.A.
|---- | -------------------------------------

|(26) | Wholly owned subsidiary of GL Trade Holdings Inc.
|---- | -------------------------------------------------

|(27) | 51% owned subsidiary of MBE
Holding S.p.A.
|---- | ------------------------------------------

|(28) | 33.3% owned subsidiary of
Euronext Paris S.A.; 66.7% owned subsidiary of MTS S.p.A.
|---- | -----------------------------------------------------------------------------------

|(29) | Wholly owned subsidiary of MTS
S.p.A.
|---- | -------------------------------------

|(30) | 89.5% owned subsidiary of MTS
S.p.A.
|---- | ------------------------------------

|(31) | Wholly owned subsidiary of
Euronext UK plc
|---- | ------------------------------------------

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

|(33) | 98% owned subsidiary of LIFFE
Ventures Inc.; 2% owned subsidiary of LIFFE Ventures II Inc.
|---- | ------------------------------------------------------------------------------------------

|(34) | Wholly owned subsidiary of Hugin AS
|---- | -----------------------------------



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