| 303 Proprietary Trading, LLC |
| ABN AMRO Bank N.V. |
| Allston Holdings, LLC |
| AQR Absolute Return Master Account, L.P. |
| Atlantic Trading USA, LLC |
| Atlas Master Fund, Ltd. |
| Belvedere Trading LLC |
| Blue Capital Group LLC |
| BlueCrest Capital International Master Fund Limited |
| BlueFire Capital, LLC |
| Breakwater Trading, LLC |
| Brevan Howard Master Fund Ltd. |
| Buttonwood Group Trading LLC |
| Calyon |
| Chopper Trading LLC |
| Consolidated Trading, LLC |
| Crabel Fund, L.P. |
| CTC Holdings, L.P. |
| D.E. Shaw Composite Portfolios, L.L.C. |
| Dresdner Kleinwort Securities LLC |
| DRW Holdings, LLC |
| Eldorado Trading Group LLC |
| Fortress Macro Master Fund, LP |
| Gator Trading Partners LLC |
| GHF Holdings Ltd. |
| Hard Eight Futures, LLC |
| Henning-Carey Proprietary Trading, LLC |
| HTG Capital Partners, LLC |
| IMC B.V. |
| Infinium Capital Management, LLC |
| International Trading Group, L.L.C. |
| Intrade, LLC |
| Kingstree Trading, LLC |
| Kottke Associates, L.L.C. |
| Liger Investments Limited |
|
| London Diversified Fund Ltd. |
| M & N Trading, L.L.C. |
| Madison Tyler, LLC |
| Marquette Partners, L.P. |
| Medallion Trading |
| Millennium Partners, L.P. |
| Mizuho Financial Group, Inc. |
| Moore Macro Fund, L.P. |
| Nico Holdings, LLC |
| Opera House Trading, LLC |
| Optiver US, LLC |
| Q1 Partners, LP |
| Quantum Partners LDC |
| Quiet Light Securities, LLC |
| RGM Trading, LLC |
| Rho Trading Securities, LLC |
| Rigel Cove Fund LLC |
| RSJ PowerFunds, Inc., PCC - Cell STS High Yield |
| S.A.C. International Equities, LLC |
| SG Americas Securities LLC |
| SKTY Asset Management L.L.C. |
| Sumitomo Mitsui Banking Corporation |
| Sun Holdings LLC |
| Susquehanna Clearing, LLC |
| Systematic Alpha Futures Fund, Ltd |
| The Bank of Tokyo-Mitsubishi UFJ, Ltd. |
| Tower Research Capital Investments LLC |
| Traditum Group LLC |
| Tudor Investment Corporation |
| Twitch, LLC |
| Virtu Financial LLC |
| W.H. Trading, L.L.C. |
| Walleye Trading, LLC |
| WCG Master Fund, Ltd. |
| Wolverine Trading, LLC |
|
