Texas Regional Bancshares

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Shareholders' Interest

Corporate Headquarters Texas Regional Bancshares, Inc. 3900 North 10th Street, 11th Floor Post Office Box 5910 McAllen, Texas 78502-5910 (956) 631-5400 Registrar & Transfer Agent Computershare Investor Services, LLC Attn: Shareholder Services P.O. Box 43036 Providence, RI 02940-3036 Shareholders with questions regarding their stock should contact the Registrar at (312) 360-5456 from 8:30 a.m. - 5:00 p.m. (CST) or visit the website www.computershare.com. Stock Listing Shares of Texas Regional Bancshares, Inc. common stock are traded on the Nasdaq National Market tier of the Nasdaq Stock Market^® under the symbol TRBS.	Form 10-K Annual Report Single copies of the Company's 2005 Form 10-K Annual Report filed with the Securities and Exchange Commission (without exhibits) will be provided without charge to shareholders upon written request online or by postal mail to: Dennis Cahlik Vice President Controller & Assistant Secretary Texas Regional Bancshares, Inc. P.O. Box 5910 McAllen, Texas 78502-5910 or by calling our annual report service at (888) 400-7789. Investor Inquiries Analysts, investors and others desiring additional financial data about Texas Regional Bancshares, Inc. may contact: Glen Roney Chairman of the Board & CEO (956) 632-7720 (956) 631-1892 fax or John Martin Executive Vice President & CFO (956) 632-7613 (956) 631-5450 fax

Shareholders' Interest

Corporate Headquarters
Texas Regional Bancshares, Inc.
3900 North 10th Street, 11th Floor
Post Office Box 5910
McAllen, Texas 78502-5910
(956) 631-5400

Registrar & Transfer Agent
Computershare Investor Services, LLC
Attn: Shareholder Services
P.O. Box 43036
Providence, RI 02940-3036

Shareholders with questions regarding their stock should contact the Registrar at (312) 360-5456 from 8:30 a.m. - 5:00 p.m. (CST) or visit the website www.computershare.com.

Stock Listing
Shares of Texas Regional Bancshares, Inc. common stock are traded on the Nasdaq National Market tier of the Nasdaq Stock Market^® under the symbol TRBS.

Form 10-K Annual Report
Single copies of the Company's 2005 Form 10-K Annual Report filed with the Securities and Exchange Commission (without exhibits) will be provided without charge to shareholders upon written request online or by postal mail to:

Dennis Cahlik
Vice President
Controller & Assistant Secretary
Texas Regional Bancshares, Inc.
P.O. Box 5910
McAllen, Texas 78502-5910

or by calling our annual report service at (888) 400-7789.

Investor Inquiries
Analysts, investors and others desiring additional financial data about Texas Regional Bancshares, Inc. may contact:

Glen Roney
Chairman of the Board & CEO
(956) 632-7720
(956) 631-1892 fax
or
John Martin
Executive Vice President & CFO
(956) 632-7613
(956) 631-5450 fax

Current Stock Information

Quicklinks are provided to The Nasdaq Stock Market, Inc. ("Nasdaq") for informational purposes only. All data is provided "as is" without warranty of any kind. Texas Regional Bancshares, Inc. ("Company") makes no representations and disclaims all express, implied, and statutory warranties of any kind to user and/or any third party including warranties as to accuracy, timeliness, completeness, merchantability, or fitness for any particular purpose.
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InvestorRelations@TRBSinc.com
It is of utmost importance to Texas State Bank that our customers trust our ability to secure their confidential account information. Since information sent over the Internet may not be secure, we request that you do not include confidential information in your e-mail correspondence to us. If you are submitting any information that should be kept confidential, please contact us by telephone, mail or in person at your nearest banking center.