INTERNATIONAL BANCSHARES CORP

Common Stock and Dividends

We have issued and outstanding 62,177,719 shares of $1.00 par value common stock held by approximately 1,689 holders of record at February 23, 2026. The book value of the common stock at December 31, 2025 was $54.86 per share compared with $47.47 per share at December 31, 2024.

Our common stock is traded on the Nasdaq National Market under the symbol “IBOC.” The following table sets forth the approximate high and low bid prices in our common stock during 2025 and 2024, as quoted on the Nasdaq National Market for each of the quarters in the two-year period ended December 31, 2025. Some of the quotations reflect inter-dealer prices, without retail mark-up, mark-down or commission and may not necessarily represent actual transactions. The closing sales price of our common stock was $68.34 per share at February 23, 2026.

We paid cash dividends of $.70 per share on February 28 and August 29, 2025, respectively, to all record holders of our common stock on February 14 and August 15, 2025, respectively. We paid cash dividends of $.66 per share on

February 28 and August 28, 2024, respectively, to all record holders of our common stock on February 15 and August 14, 2024, respectively.

Our principal source of funds to pay cash dividends on our common stock is cash dividends from our Subsidiary Banks. For a discussion of the limitations, please see Note 18 of our Notes to Consolidated Financial Statements.