Authorized Dealers and Financial Institutions

October 1, 2012

Primary Dealers

Bank of America Merrill Lynch

Cantor Fitzgerald & Co.

Jefferies & Co.

J.P.Morgan Securities, Inc.

Morgan Stanley Wealth Management

RBC Capital Markets, LLC

UBS Securities, LLC

Other

Bank of New York Mellon (Chicago)

BOSC, Inc. (Tulsa)

Country Club Bank (Edmond)

Commerce Bank (Kansas City)

Raymond James & Assoc. (Houston)

Sanders, Morris, Harris (Tulsa)

Southwest Securities (Dallas)

Sterne, Agee & Leach (Birmingham)

Stifel Nicholas (Dallas)

UMB Bank, NA (Kansas City)

Wells Fargo Securities (Dallas)