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INTERNATIONAL BANCSHARES CORP

For the period ended Dec 31, 2025. Filed Feb 26, 2026.

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A company's yearly report to the SEC, with audited financial statements. It is the fullest account a company gives of its business, its finances and the risks it sees.

FY2025 · Filed Feb 26, 2026

IBOC$67.60-1.0%Stored close · as of Nov 6, 2026

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Contents

EX-13 · Exhibit

Exhibit 13

As used in this report, the words “Company,” “we,” “us,” and “our” refer to International Bancshares Corporation, a Texas corporation, its five wholly owned subsidiary banks (“Subsidiary Banks”), and its other subsidiaries. The information that follows may contain forward-looking statements, which involve various risks and uncertainties, including those identified in Item 1A (Risk Factors) of our Annual Report on Form 10-K for the year ended December 31, 2025, and are qualified as indicated under “Cautionary Notice Regarding Forward-Looking Information” in Item 7 (Management’s Discussion and Analysis of Financial Condition and Results of Operations) of this report. Our website address is www.ibc.com.

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The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.