International Bancshares amends bylaws to remove 3% derivative standing, exclusive forum, jury waiver

INTERNATIONAL BANCSHARES CORP

• Removed requirement that shareholders must beneficially own 3% of stock to bring derivative proceedings.
• Eliminated exclusive forum clause that designated Texas Business Court as sole venue for claims.
• Removed mandatory jury trial waiver for internal entity claims against IBC.
• Amendments adopted by Board and effective May 12, 2026.

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