KEFCO SECURITIES, INC. 
KEYSTONE TRADING PARTNERS 
KNIGHT EXECUTION PARTNERS LLC
KNIGHT FINANCIAL PRODUCTS LLC
KRJ SECURITIES 

LEGG MASON WOOD WALKER, INC. 
LEHMAN BROTHERS INC. 
LEK SECURITIES CORPORATION 
LIEBER & WEISSMAN SECURITIES, L.L.C. 
LINK STRATEGIES, L.P.

M. BURTNICK & CO. 
MAIN LINE OPTIONS TRADERS 
MAN FINANCIAL INC. 
MARKET STREET SECURITIES, INC 
McDONALD INVESTMENTS INC.
McNAMARA TRADING COMPANY 
MEDFORD FINANCIAL, INC.
MERRILL LYNCH PROFESSIONAL CLEARING CORP. 
MERRILL LYNCH, PIERCE, FENNER & SMITH INC. 
METZLER SECURITIES GMBH 
MICRO TRADE, LLC 
MILLENNIUM TRADING, INC. 
MILLER TABAK & CO., LLC 
MOGATOR TRADING PARTNERS, LLC 
MONROE CAPITAL, LLC 
MORGAN STANLEY & CO. INCORPORATED 
MORGAN STANLEY DW. INC. 
NATIONAL FINANCIAL SERVICES LLC 

NEUBERGERBERMAN, LLC 
NO LIMIT INVESTMENTS, LP 
NOMURA SECURITIES INTERNATIONAL, INC 

O'CONNOR & COMPANY LLC 
OCTAGON SECURITIES, LLC 
OCTORARO CO. 
ON PAR TRADING, LLC 
OPTEX SERVICES LLC 
ORBIT II PARTNERS, L.P. 
ORDER EXECUTION SERVICES, LLC 

PARK AVENUE SECURITIES, INC. 
PAX CLEARING CORPORATION 
PERFORMANCE SPECIALIST GROUP, LLC
PERSHING TRADING COMPANY, L.P. 
PREFERRED TRADE, INC. 
PRUDENTIAL SECURITIES INC. 
PTR, INC. 

RABEN TRADING, LLC 
RANCOCAS GROUP, LP 
RAYMOND JAMES & ASSOCIATES, INC. 
RBC DAIN RAUSCHER INCORPORATED
REB SECURITIES, INC. 
RONIN CAPITAL, LLC 
ROSENBAUM CAPITAL, LLC 

S. AND S. TRADING INCORPORATED 
SALOMON SMITH BARNEY INC.
SASQUATCH TRADING LP 
SCHWARTZ & COMPANY 
SG COWEN SECURITIES CORP. 
SHANER ASSOCIATES 
SILVER FOX CAPITAL, LLC 
SLATER SECURITIES, LLC 
SLK-HULL DERIVATIVES LLC 
SPEAR, LEEDS & KELLOGG 
STIFEL, NICOLAUS & COMPANY, INC. 
STR TRADING PARTNERS L.L.C. 
STRATEGIC INVESTMENT FUND, LP 
SUMMER STREET SECURITIES, LLC 
SUSQUEHANNA INVESTMENT GROUP 
SWISS AMERICAN SECURITIES INC. 

TAHOE TRADING L.L.C. 
TANSTAAFL RESEARCH & TRADING, LLC 
TCJ SECURITIES, L.P. 
TD OPTIONS, L.L.C. 
TD WATERHOUSE INVESTOR SERVICES, INC. 
TECUMSEH INVESTMENTS, L.P. 
TEMPEST TRADING PARTNERS, INC. 
THE CASELLA VENDETTE GROUP, INC. 
THOMAS CAPITAL CORPORATION 
TIBERIUS MASTER FUND LTD.
TIBURON FUND TRADING, L.L.C. 
TIMBER HILL LLC 
TJB TRADING, INC. 
TMBB TRADING, L.P. 
TRADING PLACES CORP. 
TSR ASSOCIATES, LLC 

UBS WARBURG LLC 
URBRO, LP 
UBS PAINEWEBBER INC. 

VAN BUREN SECURITIES, LLC
VAN DER MOOLEN Options U.S.A LLC

WALLACE SECURITIES CORP. 
WILLIAM BLAIR & COMPANY, L.L.C. 
WILLIAM J. MORRIS SECURITY TRADERS, INC. 
WINDDRIFT SECURITIES, L.P. 
WOLVERINE TRADING, L.P. 
WRITE CAPITAL MANAGEMENT, INC. 

ZEITZER OPTIONS, INC.