| Member |
| ABS Brokerage Services, LLC |
| Albert Fried & Co LLC |
| Allston Trading LLC |
| Andrie Trading, LLC |
| Archelon LLC |
| Archipelago Securities, LLC |
| Assent LLC |
| Automated Trading Desk Brokerage Services, LLC |
| Automated Trading Desk Financial Services, LLC |
| Ballista Securities LLC |
| Banc of America Securities LLC |
| Barclays Capital, Inc. |
| BATS Trading, Inc. |
| Baycrest LLC |
| Bear, Stearns & Co. Inc. |
| Bear, Stearns Securities Corp. |
| Belvedere Trading, LLC |
| Benchmark Company, LLC |
| Bengal Capital, LLC |
| Biremis Corporation |
| Bloomberg Tradebook LLC |
| Blue Capital Group LLC |
| BNP Paribas Securities Corp. |
| BNY ConvergEX Execution Solutions LLC |
| BTIG, LLC |
| Bulltick Securities, LLC |
| Bulltick, LLC |
| Calyon Securities (USA) Inc. |
| Cantor Fitzgerald & Co. |
| Capstone Sales Advisors, LLC |
| Capstone Trading, LLC |
| Casey Professional Services, LLC |
| Casey Securities, LLC |
| CIBC World Markets Corp. |
| Citadel Derivatives Group LLC |
| Citadel Trading Group LLC |
| Citigroup Derivatives Markets Inc. |
| Citigroup Global Markets Inc. |
| Clancy Financial Services, Inc. |
| Collins Stewart LLC |
| Compass Professional Services, LLC |
| Cornerstone Trading, LLC |
| Cowen & Company, LLC |
| Credit Suisse Securities (USA) LLC |
| CTC, L.L.C. |
| Cutler Group, LP |
| Cuttone & Co. Inc |
| DART Executions LLC |
| Deutsche Bank Securities Inc. |
| Direct Edge ECN LLC |
| Direct Trading Institutional, L.P. |
| Divine Capital Markets LLC |
| Dresdner Kleinwort Securities LLC |
| E*TRADE Capital Markets, LLC |
| E*TRADE Clearing LLC |
| Electronic Brokerage Systems, LLC |
| Equitec Proprietary Markets, LLC |
| Eroom Securities, LLC |
| EWT, LLC |
| Exane, Inc. |
| First Clearing, LLC |
| First New York Securities L.L.C. |
| Fortis Clearing Americas LLC |
| G-Bar Limited Partnership |
| Genesis Securities, LLC |
| Geneva Trading LLC |
| GFI Securities LLC |
| Global Execution Brokers, LP |
| Goldman Sachs Execution & Clearing, L.P. |
| Goldman, Sachs & Co. |
| Group One Trading, L.P. |
| Guzman & Company |
| Hamilton Executions LLC |
| Hamilton Executions, LLC |
| Hapoalim Securities USA, Inc. |
| Hardcastle Trading USA L.L.C. |
| Heights Partners, Inc. |
| HSBC Securities (USA) Inc. |
| Hybrid Trading & Resources, LLC |
| IMC Chicago, LLC |
| Ingalls & Snyder, LLC |
| Instinet, LLC |
| Interactive Brokers LLC |
| International Correspondent Trading, Inc. |
| ISERoute, LLC |
| Israel A. Englander & Co. Inc. |
| ITG Derivatives LLC |
| ITG Inc. |
| J.P. Morgan Inc |
| J.P. Morgan Securities Inc. |
| Jefferies & Company, Inc. |
| Jefferies Execution Services, Inc. |
| Jump Trading, LLC |
| Kellogg Partners Institutional Services |
| Knight Capital Markets LLC |
| Knight Equity Markets,L.P. |
| LaBranche Structured Products LLC |
| Lavaflow, Inc. |
| Legent Clearing Corp. |
| Lehman Brothers Inc. |
| Lek Securities Corporation |
| Linkage User |
| Linkbrokers Derivatives Corporation |
| Liquidpoint, LLC |
| Louis Capital Markets, LP |
| MAKO Financial Markets, LLC |
| Maxim Group LLC |
| MCM Securities, LLC |
| Merrill Lynch Professional Clearing Corp. |
| Merrill Lynch, Pierce, Fenner & Smith Incorporated |
| MF Global Securities Inc |
| MillenCo, L.L.C. |
| Miller Tabak + Co., LLC |
| Montecito Advisors, Inc. |
| Morgan Stanley & Co. Incorporated |
| Morgan Stanley DW Inc. |
| Nasdaq Execution Services, LLC |
| Nasdaq Options Services, LLC |
| National Financial Services LLC |
| Natixis Securities North America Inc. |
| Neuberger Berman, LLC |
| Newedge USA, LLC |
| Nomura Securities International, Inc. |
| Nunami Securities, LLC |
| NYFIX Transaction Services, Inc. |
| OCTEG, LLC |
| On Point Execution, LLC |
| Oppenheimer & Co. Inc. |
| optionsXpress, Inc. |
| Optiver US, LLC |
| OTA LLC |
| Pali Capital Inc. |
| PEAK6 Capital Management LLC |
| Penson Financial Services, Inc. |
| Pershing LLC |
| Pictet Overseas Inc. |
| Piper Jaffray & Co. |
| Prebon Financial Products Inc. |
| PreferredTrade, Inc. |
| PTR, Inc. |
| Quiet Light Securities, LLC |
| R & H Securities, LLC |
| Raymond C. Forbes & Co., Inc. |
| RBC Capital Markets Corporation |
| Ridge Clearing & Outsourcing Solutions, Inc. |
| Ronin Capital, LLC |
| ROQ Capital, LLC |
| Rosenblatt Securities Inc. |
| Samurai Trading, LLC |
| Sanford C. Bernstein & Co.,LLC |
| Saratoga Capital, LLC |
| Schonfeld Securities, LLC |
| SG Americas Securities, LLC |
| Shoreline Trading Group, LLC |
| Southwest Securities, Inc. |
| Spot Trading, L.L.C. |
| Sun Trading, LLC |
| Susquehanna Investment Group |
| TD Options LLC |
| TD Professional Execution, Inc. |
| Terra Nova Financial, LLC |
| TFS Derivatives Corporation |
| Thomas Weisel Partners LLC |
| Timber Hill LLC |
| Track Data Securities Corp. |
| TradeKing |
| TradeStation Securities, Inc. |
| Trading Machines LLC |
| Tradition Asiel Securities Inc. |
| UBS Financial Services, Inc. |
| UBS Securities LLC |
| UNX, Inc. |
| Vandham Securities Corp. |
| VDM Trading, LLC |
| Vision Financial Markets LLC |
| Wachovia Capital Markets, LLC |
| Wachovia Securities, LLC |
| Wall Street Access |
| Walleye Trading, LLC |
| Wedbush Morgan Securities Inc. |
| Wolverine Execution Services, LLC |
| Wolverine Trading, LLC |
| X-Change Financial Access LLC |