| Goldman, Sachs & Co. |
| Fortis Clearing Americas LLC |
| Goldman Sachs Execution & Clearing, L.P. |
| Sanford C. Bernstein & Co. LLC |
| Morgan Stanley & Co. Incorporated |
| Interactive Brokers L.L.C. |
| Jefferies & Company, Inc. |
| Dundee Securities Corporation |
| Natixis Bleichroeder, Inc. |
| RBC Capital Markets Corporation |
| Ferris, Baker Watts, Inc. |
| BMO Capital Markets Corporation |
| Morgan Stanley & Co. Incorporated |
| Legent Clearing LLC |
| Prime Dealer Services Corp. |
| J.P. Morgan Securities Inc. |
| Prudential Bache Commodities, LLC |
| Barclays Capital Inc. |
| LPL Financial Corporation |
| National Bank Financial Inc. |
| Barclays Capital Inc. |
| Deutsche Bank Securities Inc. |
| Lek Securities Corporation |
| ITG, Inc. |
| Wedbush Morgan Securities, Inc. |
| Prudential Bache Securities, LLC |
| Penson Financial Services, Inc. |
| Merrill Lynch Professional Clearing Corp. |
| MF Global Inc. |
| Ingalls & Snyder L.L.C. |
| Banca IMI Securities Corporation |
| First Clearing, LLC |
| Neuberger Berman, L.L.C. |
| Neuberger Berman, L.L.C. |
| Ridge Clearing & Outsourcing Solutions, Inc. |
| Merrill Lynch Pierce Fenner & Smith Inc. |
| Charles Schwab & Co., Inc. |
| Nomura Securities International Inc. |
| Scotia Capital Inc. |
| RBC Dominion Securities Inc. |
| Wachovia Securities, LLC |
| Goldman Sachs Execution & Clearing, L.P. |
| Gelber Group LLC |
| BMO Nesbitt Burns, Inc. |
| American Enterprise Investment Services, Inc. |
| UBS Financial Services Inc. |
| National Financial Services LLC |
| Lek Securities Corporation |
| BNP Paribas Prime Brokerage, Inc. |
| Compass Professional Services, LLC |
| Penson Financial Services, Inc. |
| RBC Capital Markets Corporation |
| SMW Trading Company, Inc. |
| Barclays Capital Inc. |
| Greenwich Capital Markets, Inc. |
| Maple Securities U.S.A. Inc. |
| ING Financial Markets LLC |
| TradeStation Securities, Inc. |
| Southwest Securities, Inc. |
| Albert Fried & Company, LLC |
| SG Americas Securities, LLC |
| J.P. Morgan Clearing Corp. |
| Credit Suisse Securities (USA) LLC |
| MF Global Inc. |
| NYFIX Securities Corporation |
| Merrill Lynch Pierce Fenner & Smith Inc. |
| Lazard Capital Markets LLC |
| First Southwest Company |
| Bank of America Securities, LLC |
| Piper Jaffray & Co. |
| Bank of America Securities, LLC |
| Goldman Sachs Execution & Clearing, L.P. |
| Electronic Brokerage Systems, LLC. |
| optionsXpress, Inc. |
| Octeg, LLC |
| J.P. Morgan Clearing Corp. |
| Credit Suisse Securities (USA) LLC |
| Terra Nova Financial, LLC |
| USAA Investment Management Company |
| Tradition Asiel Securities Inc. |
| Janney Montgomery Scott L.L.C. |
| BNP Paribas Securities Corp. |
| E*TRADE Clearing LLC |
| Tradelink L.L.C. |
| Fortis Clearing Americas LLC |
| CGMI |
| Citigroup Global Markets Inc. |
| Stephens Inc. |
| ABN AMRO Inc. |
| Automated Trading Desk Financial Services, LLC |
| Newedge USA, LLC |
| MF Global Inc. |
| Archipelago Securities, L.L.C. |
| CIBC World Markets Corp. |
| Assent LLC |
| Pershing LLC |
| StockCross Financial Services, Inc. |
| UBS Securities LLC |
| MF Global Inc. |
| Newedge USA, LLC |
| MS Securities Services Inc. |
| Goldman, Sachs & Co. |
| Goldman Sachs Execution & Clearing, L.P. |
| CIBC World Markets Inc. |
| Vision Financial Markets LLC |
| Lek Securities Corporation |
| Penson Financial Services, Inc. |
| Ziv Investment Company |
| Merrill Lynch Professional Clearing Corp. |
| Nasdaq Option Services, LLC |
| Paloma Securities, L.L.C. |
| Interactive Brokers L.L.C. |
| Merrill Lynch Professional Clearing Corp. |
| Fortis Clearing Americas LLC |
| Robert W. Baird & Co. Incorporated |
| Timber Hill L.L.C. |
| Merrill Lynch Professional Clearing Corp. |
| Merrill Lynch Professional Clearing Corp. |
| Fortis Clearing Americas LLC |
| Oppenheimer & Co. Inc. |
| Goldman Sachs Execution & Clearing, L.P. |
| Deutsche Bank Securities Inc. |
| Merrill Lynch Professional Clearing Corp. |
| Barclays Capital Inc. |
| LiquidPoint, LLC |
| KDC Merger Arbitrage Fund, LP |
| Vision Financial Markets LLC |
| Tradelink L.L.C. |
| Merrill Lynch Professional Clearing Corp. / Merrill Lynch Futures |
| Morgan Stanley & Co. Incorporated |
| Electronic Brokerage Systems, LLC. |
| Newedge USA, LLC |
| Merrill Lynch Pierce Fenner & Smith/Broker Dealer Execution Services |
| Timber Hill L.L.C. |
| TD Waterhourse Canada Inc. |
| UBS Securities LLC |
| UBS Securities LLC |
| Interactive Brokers L.L.C. |
| Bernard L. Madoff Investment Securities LLC |
| Daiwa Securities America, Inc. |
| Calyon Securities (USA) Inc. |
| BNP Paribas Securities Corp. |
| Newedge USA, LLC |
| J.P. Morgan Futures Inc. |
| Merrill Lynch Professional Clearing Corp. |
| Newedge USA, LLC |
| Merrill Lynch Professional Clearing Corp. |
| Lakeshore Securities, L.P. |
| Merrill Lynch Pierce Fenner & Smith/Broker Dealer Execution Services |
| Goldman Sachs Execution & Clearing, L.P. |
| Fortis Clearing Americas LLC |
| Cantor Fitzgerald & Co. |
| Clearview Correspondent Services, LLC |
| Scottrade, Inc. |
| Newedge USA, LLC |
| Fortis Securities, LLC |
| Newedge USA, LLC |
| Raymond James & Associates, Inc. |
| Mesirow Financial Inc. |
| Fortis Clearing Americas LLC |
| Wells Fargo Investments, LLC |
| Goldman Sachs Execution & Clearing, L.P. |
| Citigroup Global Markets Inc. |
| EWT, LLC |
| H&R Block Financial Advisors, Inc. |
| Newedge USA, LLC |
| J.J.B. Hilliard, W.L. Lyons, LLC |
| William Blair & Company, L.L.C. |
| Bank of America Securities, LLC |
| Citadel Trading Group L.L.C. |
| TD Ameritrade Clearing, Inc. |
| Morgan, Keegan & Company, Inc. |
| Merrill Lynch Professional Clearing Corp. |
| Merrill Lynch Pierce Fenner & Smith/Broker Dealer Execution Services |
| Stifel Nicolaus & Company Incorporated |
| RBC Capital Markets Corporation |
| Fortis Clearing Americas LLC |
| HSBC Securities (USA) Inc. |
| J.P. Morgan Clearing Corp. |
| Goldman Sachs Execution & Clearing, L.P. |
| Fortis Clearing Americas LLC OCC/ICE CLEAR Cross Margin |
| J.P. Morgan Clearing Corp. |
| Goldman Sachs Execution & Clearing, L.P. |
| Goldman Sachs Execution & Clearing, L.P. |
| Merrill Lynch Professional Clearing Corp. |
| Chicago Mercantile Exchange |
| Goldman Sachs Execution & Clearing, L.P. |
| Bank of America Securities, LLC |
| Nomura Securities International Inc. |
