AEI Production Company
AnSon Partners, L.L.C.
Austin Production Company
Axem Resources Incorporated
B. D. Eddie Enterprises, L.L.C.
BancFirst
Bank of America, N.A.
Bank of New York
Bank of Oklahoma, N.A.
Bank of Union
Bank One Corporation
Bank One, Oklahoma, N.A.
Bank One Trust Company, N.A.
BP America Production Company (previously Amoco Production Company and Vastar Resources, Inc.)
Cable One
Cabot Oil & Gas Corporation
CEC Entertainment, Inc.
Central National Bank of Alva
Central Oklahoma Oil and Gas Corporation
Chaparral Energy, L.L.C.
Chesapeake Operating, Inc.
Chesapeake Energy Corporation
Cirrus Production Company
ConocoPhillips Company
Devon Energy
Equipment Technology, L.L.C.
Equitable Life Assurance Society of the United States
Farm Credit Bank of Wichita (and related institutions)
Farmers and Merchants Bank of Crescent
Fidelity Bank (Wichita)
Financial Federal Credit Inc.
First National Bank of Thomas, Oklahoma
First Oklahoma Corporation (and related companies)
Georgia-Pacific Corporation
GMAC Business Credit LLC
Hanover Compressor Company
Heller First Capital Corp.
Hilb, Rogal and Hamilton Company
Holden Energy Corporation
Hopeton State Bank
John A. Henry & Co., Ltd.
Jolen Operating Company
Local Oklahoma Bank, N.A.
LSB Industries, Inc.
Metropolitan Life Insurance Company
Natural Gas Storage Corporation of North America
Oklahoma Transportation Authority (formerly Oklahoma Turnpike Authority)
ORIX Financial Services, Inc.
PM Group, L.L.C.
Pan American Life Insurance Company
Phillips Petroleum Company
Phoenix Leasing Incorporated
Ricks Exploration, Inc.
Sandridge Energy, Inc.
7-Eleven Stores
Shawver & Son, Inc.
Spartan Resources LLC
Stephens County Industrial Development Authority
Trammell Crow Company
United States Cellular Corporation
Walters Power International
The Wellmark Company, L.L.C.