Basis of Presentation	6 Months Ended
Jun. 30, 2026
Basis of Presentation
Basis of Presentation	Note 1 — Basis of Presentation Our accounting and reporting policies conform to accounting principles generally accepted in the United States of America (“US GAAP”) and to general practices within the banking industry. Our consolidated financial statements include the accounts of International Bancshares Corporation, and our five wholly-owned bank subsidiaries, International Bank of Commerce, Laredo (“IBC”), Commerce Bank, International Bank of Commerce, Zapata, International Bank of Commerce, Brownsville, International Bank of Commerce, Oklahoma (the “Subsidiary Banks”) and our six wholly-owned non-bank subsidiaries, IBC Trading Company, Premier Tierra Holdings, Inc., IBC Charitable and Community Development Corporation, IBC Capital Corporation, Diamond Beach Holdings, LLC and WCMH, LLC. Our consolidated financial statements are unaudited but include all adjustments that, in the opinion of management, are necessary for a fair presentation of the results of the periods presented. All such adjustments were of a normal and recurring nature. These financial statements should be read in conjunction with the financial statements and the notes thereto in our latest Annual Report to Shareholders on Form ARS for the fiscal year ended December 31, 2025, furnished to the U.S. Securities and Exchange Commission (“SEC”) on February 26, 2026 (our “2025 Annual Report”). Our consolidated statement of condition at December 31, 2025 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by US GAAP for complete financial statements. We operate as one segment, banking. The chief operating decision maker (“CODM”) is our chief executive officer. The operating information used by our CODM for purposes of assessing performance and making operating decisions is the consolidated statements presented in this report. We have five active operating subsidiaries, the Subsidiary Banks. Our Subsidiary Banks offer all products and services on the same basis and on the same terms and operate in the same regulatory environment. We apply the provisions of ASC Topic 280, “Segment Reporting,” in determining our reportable segments and related disclosures. Subsequent to the end of the period and through the date we have issued these financial statements, we reduced our ownership percentage in a merchant banking investment in accordance with regulatory requirements for merchant banking investments and their holding period. We are still evaluating the impact of the transaction on our financial statements.

Basis of Presentation

6 Months Ended

Jun. 30, 2026

Note 1 — Basis of Presentation

Our accounting and reporting policies conform to accounting principles generally accepted in the United States of America (“US GAAP”) and to general practices within the banking industry. Our consolidated financial statements include the accounts of International Bancshares Corporation, and our five wholly-owned bank subsidiaries, International Bank of Commerce, Laredo (“IBC”), Commerce Bank, International Bank of Commerce, Zapata, International Bank of Commerce, Brownsville, International Bank of Commerce, Oklahoma (the “Subsidiary Banks”) and our six wholly-owned non-bank subsidiaries, IBC Trading Company, Premier Tierra Holdings, Inc., IBC Charitable and Community Development Corporation, IBC Capital Corporation, Diamond Beach Holdings, LLC and WCMH, LLC. Our consolidated financial statements are unaudited but include all adjustments that, in the opinion of management, are necessary for a fair presentation of the results of the periods presented. All such adjustments were of a normal and recurring nature. These financial statements should be read in conjunction with the financial statements and the notes thereto in our latest Annual Report to Shareholders on Form ARS for the fiscal year ended December 31, 2025, furnished to the U.S. Securities and Exchange Commission (“SEC”) on February 26, 2026 (our “2025 Annual Report”). Our consolidated statement of condition at December 31, 2025 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by US GAAP for complete financial statements.

We operate as one segment, banking. The chief operating decision maker (“CODM”) is our chief executive officer. The operating information used by our CODM for purposes of assessing performance and making operating decisions is the consolidated statements presented in this report. We have five active operating subsidiaries, the Subsidiary Banks. Our Subsidiary Banks offer all products and services on the same basis and on the same terms and operate in the same regulatory environment. We apply the provisions of ASC Topic 280, “Segment Reporting,” in determining our reportable segments and related disclosures.

Subsequent to the end of the period and through the date we have issued these financial statements, we reduced our ownership percentage in a merchant banking investment in accordance with regulatory requirements for merchant banking investments and their holding period. We are still evaluating the impact of the transaction on our financial statements.