IBOC / International Bancshares Corporation - SEC Filings, Annual Report, Proxy Statement

International Bancshares Corporation
US ˙ NasdaqGS ˙ US4590441030

Basic Stats
LEI 549300Y16R531AU8TX77
CIK 315709
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to International Bancshares Corporation
SEC Filings (Chronological Order)
This page provides a complete, chronological list of SEC Filings, excluding ownership filings which we provide elsewhere.
August 12, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 6, 2025 INTERNATIONAL BAN

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 6, 2025 INTERNATIONAL BANCSHARES CORPORATION (Exact name of registrant as specified in its charter) Texas 000-9439 74-2157138 (State or other jurisdiction of incorporation) (C

August 12, 2025 EX-3.1

SECOND AMENDED AND RESTATED INTERNATIONAL BANCSHARES CORPORATION AS OF August 6, 2025 ARTICLE I

Exhibit 3.1 SECOND AMENDED AND RESTATED BY-LAWS OF INTERNATIONAL BANCSHARES CORPORATION AS OF August 6, 2025 ARTICLE I OFFICES Section 1. Principal Office. The principal office of the Corporation shall be in Laredo, Texas. Section 2. Other Offices. The Corporation may also have offices at such other places both within and without the State of Texas as the Board of Directors may from time to time d

August 7, 2025 EX-31.(A)

31(a) —Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(a) Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Dennis E.

August 7, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 000-09439 INTERNATIONAL BANCSHAR

August 7, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 7, 2025 INTERNATIONAL BAN

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 7, 2025 INTERNATIONAL BANCSHARES CORPORATION (Exact name of registrant as specified in its charter) - Texas 000-9439 74-2157138 (State or other jurisdiction (Commission File (

August 7, 2025 EX-31.(B)

31(b) —Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(b) Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Judith I.

August 7, 2025 EX-99

IBC Reports Strong Earnings for the First Half of 2025

EXHIBIT 99 Contact: Judith Wawroski, Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 FOR IMMEDIATE RELEASE: IBC Reports Strong Earnings for the First Half of 2025 LAREDO, Texas—(BUSINESS WIRE)— August 7, 2025—International Bancshares Corporation (NASDAQ:IBOC), one of the largest independent bank holding companies in Texas, today reported net income for the three months ended June 30, 2025 of $100.

August 7, 2025 EX-32.(A)

32(a)** —Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(a) CERTIFICATION PURSUANT TO 18 U.S.C. 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of International Bancshares Corporation (the “Company”) on Form 10-Q for the period ended June 30, 2025, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Dennis E. Nixon, Chief Executive Office

August 7, 2025 EX-32.(B)

32(b)** —Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(b) CERTIFICATION PURSUANT TO 18 U.S.C. 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of International Bancshares Corporation (the “Company”) on Form 10-Q for the period ended June 30, 2025 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Judith I. Wawroski, Principal Financial

August 1, 2025 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 1, 2025 INTERNATIONAL BANCSHARES CORPORATION (Exact Name of Registrant as Specified in its Charter) Texas 000-09439 74-2157138 (State or other jurisdiction of incorporation or

August 1, 2025 EX-99

INTERNATIONAL BANCSHARES CORPORATION ANNOUNCES CASH DIVIDEND

EXHIBIT 99 Contact: Judith Wawroski Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 (Laredo) FOR IMMEDIATE RELEASE INTERNATIONAL BANCSHARES CORPORATION ANNOUNCES CASH DIVIDEND LAREDO, TX, August 1, 2025 - International Bancshares Corporation (NASDAQ: IBOC) announced today that IBC’s Board of Directors approved the declaration of a 70 cents per share cash dividend for shareholders of record of Common Stock, $1.

May 21, 2025 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 19, 2025 INTERNATIONAL BANCSHARES CORPORATION (Exact name of registrant as specified in its charter) Texas 000-9439 74-2157138 (State or other jurisdiction of incorporation) (Com

May 5, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 5, 2025 INTERNATIONAL BANCSH

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 5, 2025 INTERNATIONAL BANCSHARES CORPORATION (Exact name of registrant as specified in its charter) - Texas 000-9439 74-2157138 (State or other jurisdiction (Commission File (IRS

May 5, 2025 EX-99

IBC Reports Strong Earnings

EXHIBIT 99 Contact: Judith Wawroski, Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 FOR IMMEDIATE RELEASE: IBC Reports Strong Earnings LAREDO, Texas—(BUSINESS WIRE)— May 5, 2025—International Bancshares Corporation (NASDAQ:IBOC), one of the largest independent bank holding companies in Texas, today reported net income for the first quarter of 2025 of approximately $96.

May 5, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 000-09439 INTERNATIONAL BANCSHA

May 5, 2025 EX-31.(A)

31(a) —Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(a) Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Dennis E.

May 5, 2025 EX-31.(B)

31(b) —Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(b) Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Judith I.

May 5, 2025 EX-32.(B)

32(b)** —Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(b) CERTIFICATION PURSUANT TO 18 U.S.C. 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of International Bancshares Corporation (the “Company”) on Form 10-Q for the period ended March 31, 2025 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Judith I. Wawroski, Principal Financial

May 5, 2025 EX-32.(A)

32(a)** —Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(a) CERTIFICATION PURSUANT TO 18 U.S.C. 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of International Bancshares Corporation (the “Company”) on Form 10-Q for the period ended March 31, 2025, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Dennis E. Nixon, Chief Executive Offic

April 21, 2025 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (

April 21, 2025 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.    )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.    ) Filed by the Registrant  ☒ Filed by a Party other than the Registrant  ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission On

March 14, 2025 8-K

Regulation FD Disclosure, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 12, 2025 INTERNATIONAL BANCSHARES CORPORATION (Exact Name of Registrant as Specified in its Charter) Texas 000-09439 74-2157138 (State or other jurisdiction of incorporation or

February 27, 2025 EX-13

International Bancshares Corporation 2024 Annual Report, Exhibit 13, page 1

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.

February 27, 2025 EX-31.B

Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31b Certification I, Judith I. Wawroski, certify that: 1. I have reviewed this Annual Report on Form 10-K of International Bancshares Corporation; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misle

February 27, 2025 EX-97

International Bancshares Corporation Compensation Clawback Policy

Exhibit 97 INTERNATIONAL BANCSHARES CORPORATION COMPENSATION CLAWBACK POLICY This Compensation Clawback Policy (this “Policy”) is the compensation-recovery policy of International Bancshares Corporation (the “Company”), adopted by the Company in accordance with the provisions of Rule 10D-1 promulgated by the Securities and Exchange Commission (the “SEC”) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and Rule 5608 of the listing rules adopted by The Nasdaq Stock Market LLC (“Nasdaq”; such rule, “Nasdaq Rule 5608).

February 27, 2025 EX-21

List of Subsidiaries of International Bancshares Corporation as of February 24, 2025

Exhibit 21 List of Subsidiaries Subsidiaries of International Bancshares Corporation Name State of Incorporation or Organization Business % of Ownership IBC Trading Company Texas Export Trading 100 % IBC Capital Corporation Delaware Investments 100 % IBC Charitable and Community Development Corporation Texas Community Development 100 % Premier Tierra Holdings, Inc.

February 27, 2025 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 27, 2025 INTERNATIONAL BANCSHARES CORPORATION (Exact name of registrant as specified in its charter) - Texas 000-9439 74-2157138 (State or other jurisdiction (Commission Fil

February 27, 2025 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 0-09439 INTERNATI

February 27, 2025 EX-32.A

Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32a CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of International Bancshares Corporation (the “Company”) on Form 10-K for the year ended December 31, 2024 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Dennis E. Nixon, President and Prin

February 27, 2025 EX-31.A

Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31a Certification I, Dennis E. Nixon, certify that: 1. I have reviewed this Annual Report on Form 10-K of International Bancshares Corporation; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleadi

February 27, 2025 EX-32.B

Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32b CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of International Bancshares Corporation (the “Company”) on Form 10-K for the year ended December 31, 2024 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Judith I. Wawroski, Treasurer and P

February 27, 2025 EX-99

IBC Reports Strong Earnings for 2024

EXHIBIT 99 Contact: Judith Wawroski, Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 FOR IMMEDIATE RELEASE: IBC Reports Strong Earnings for 2024 LAREDO, Texas—(BUSINESS WIRE)— February 27, 2025—International Bancshares Corporation (NASDAQ:IBOC), one of the largest independent bank holding companies in Texas, today reported annual net income for 2024 of approximately $409.

February 27, 2025 EX-4

Description of Registrant’s Securities

Exhibit 4 DESCRIPTION OF SECURITIES REGISTERED UNDER SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 The following is a summary of International Bancshares Corporation’s (“IBC”, “we”, “us”, or “our”) classes of securities registered under Section 12 of the Securities Exchange Act of 1934 (the “Exchange Act”).

February 27, 2025 EX-19

Statement of Company Policy on Securities Trades by Directors, Officers and Employees

Exhibit 19 INTERNATIONAL BANCSHARES CORPORATION STATEMENT OF COMPANY POLICY Securities Trades by Directors, Officers and Employees of the Company This Statement of Company Policy on Securities Trades by Directors, Officers and Employees of the Company (this “Policy Statement”) is intended to familiarize you with the obligations and responsibilities of directors, officers and employees of International Bancshares Corporation (“IBC”) and its subsidiaries under the federal securities laws of the United States.

February 3, 2025 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 3, 2025 INTERNATIONAL BANCSHARES CORPORATION (Exact Name of Registrant as Specified in its Charter) Texas 000-09439 74-2157138 (State or other jurisdiction of incorporation

February 3, 2025 EX-99

INTERNATIONAL BANCSHARES CORPORATION ANNOUNCES SIX PERCENT INCREASE IN CASH DIVIDEND

EXHIBIT 99 FOR IMMEDIATE RELEASE Contact: Judith Wawroski Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 (Laredo) INTERNATIONAL BANCSHARES CORPORATION ANNOUNCES SIX PERCENT INCREASE IN CASH DIVIDEND LAREDO, TX, February 3, 2025 – International Bancshares Corporation (NASDAQ: IBOC) announced today that on January 31, 2025, IBC’s Board of Directors approved the declaration of a .

November 7, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 7, 2024 INTERNATIONAL BANCSHARES CORPORATION (Exact name of registrant as specified in its charter) - Texas 000-9439 74-2157138 (State or other jurisdiction (Commission File

November 7, 2024 EX-32.A

32(a) —Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(a) CERTIFICATION PURSUANT TO 18 U.S.C. 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of International Bancshares Corporation (the “Company”) on Form 10-Q for the period ended September 30, 2024, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Dennis E. Nixon, Chief Executive O

November 7, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 000-09439 INTERNATIONAL BAN

November 7, 2024 EX-99

IBC Reports Strong Earnings for the Third Quarter of 2024

EXHIBIT 99 Contact: Judith Wawroski, Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 FOR IMMEDIATE RELEASE: IBC Reports Strong Earnings for the Third Quarter of 2024 LAREDO, Texas—(BUSINESS WIRE)— November 7, 2024—International Bancshares Corporation (NASDAQ:IBOC), one of the largest independent bank holding companies in Texas, today reported net income for the nine months ended September 30, 2024 of $294.

November 7, 2024 EX-31.A

31(a) —Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(a) Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Dennis E.

November 7, 2024 EX-31.B

31(b) —Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(b) Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Judith I.

November 7, 2024 EX-32.B

32(b) —Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(b) CERTIFICATION PURSUANT TO 18 U.S.C. 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of International Bancshares Corporation (the “Company”) on Form 10-Q for the period ended September 30, 2024 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Judith I. Wawroski, Principal Finan

September 26, 2024 CORRESP

September 26, 2024

September 26, 2024 United States Securities and Exchange Commission Division of Corporation Finance Office of Trade & Services 100 F Street, N.

August 1, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 1, 2024 INTERNATIONAL BANCSHARES CORPORATION (Exact name of registrant as specified in its charter) - Texas 000-9439 74-2157138 (State or other jurisdiction (Commission File (

August 1, 2024 EX-31.B

31(b) —Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(b) Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Judith I.

August 1, 2024 8-K

Regulation FD Disclosure, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 1, 2024 INTERNATIONAL BANCSHARES CORPORATION (Exact Name of Registrant as Specified in its Charter) Texas 000-09439 74-2157138 (State or other jurisdiction of incorporation or

August 1, 2024 EX-32.A

32(a) —Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(a) CERTIFICATION PURSUANT TO 18 U.S.C. 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of International Bancshares Corporation (the “Company”) on Form 10-Q for the period ended June 30, 2024, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Dennis E. Nixon, Chief Executive Office

August 1, 2024 EX-99

INTERNATIONAL BANCSHARES CORPORATION ANNOUNCES CASH DIVIDEND

EXHIBIT 99 Contact: Judith Wawroski Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 (Laredo) FOR IMMEDIATE RELEASE INTERNATIONAL BANCSHARES CORPORATION ANNOUNCES CASH DIVIDEND LAREDO, TX, August 1, 2024 - International Bancshares Corporation (NASDAQ: IBOC) announced today that on July 31, 2024, IBC’s Board of Directors approved the declaration of a .

August 1, 2024 EX-31.A

31(a) —Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(a) Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Dennis E.

August 1, 2024 EX-99

IBC Reports Strong Earnings for the First Half of 2024

EXHIBIT 99 Contact: Judith Wawroski, Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 FOR IMMEDIATE RELEASE: IBC Reports Strong Earnings for the First Half of 2024 LAREDO, Texas—(BUSINESS WIRE)— August 1, 2024—International Bancshares Corporation (NASDAQ:IBOC), one of the largest independent bank holding companies in Texas, today reported net income for the six months ended June 30, 2024 of $194.

August 1, 2024 EX-32.B

32(b) —Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(b) CERTIFICATION PURSUANT TO 18 U.S.C. 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of International Bancshares Corporation (the “Company”) on Form 10-Q for the period ended June 30, 2024 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Judith I. Wawroski, Principal Financial

August 1, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 000-09439 INTERNATIONAL BANCSHAR

May 22, 2024 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 20, 2024 INTERNATIONAL BANCSHARES CORPORATION (Exact name of registrant as specified in its charter) Texas 000-9439 74-2157138 (State or other jurisdiction (Commission File (IRS

May 2, 2024 EX-32.A

32(a) —Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(a) CERTIFICATION PURSUANT TO 18 U.S.C. 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of International Bancshares Corporation (the “Company”) on Form 10-Q for the period ended March 31, 2024, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Dennis E. Nixon, Chief Executive Offic

May 2, 2024 EX-31.B

31(b) —Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(b) Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Judith I.

May 2, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 000-09439 INTERNATIONAL BANCSHA

May 2, 2024 EX-32.B

32(b) —Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(b) CERTIFICATION PURSUANT TO 18 U.S.C. 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of International Bancshares Corporation (the “Company”) on Form 10-Q for the period ended March 31, 2024 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Judith I. Wawroski, Principal Financial

May 2, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 2, 2024 INTERNATIONAL BANCSHARES CORPORATION (Exact name of registrant as specified in its charter) - Texas 000-9439 74-2157138 (State or other jurisdiction (Commission File (IRS

May 2, 2024 EX-99

IBC’s Strong Earnings Continue in the First Quarter of 2024

EXHIBIT 99 Contact: Judith Wawroski, Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 FOR IMMEDIATE RELEASE: IBC’s Strong Earnings Continue in the First Quarter of 2024 LAREDO, Texas—(BUSINESS WIRE)— May 2, 2024—International Bancshares Corporation (NASDAQ:IBOC), one of the largest independent bank holding companies in Texas, today reported net income for the three months ended March 31, 2024 of $97.

May 2, 2024 EX-31.A

31(a) —Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(a) Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Dennis E.

April 22, 2024 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only

April 22, 2024 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (

April 12, 2024 EX-99

INTERNATIONAL BANCSHARES CORPORATION RANKED THIRD ON FORBES’ AMERICA’S BEST BANKS LIST FOR 2023

EXHIBIT 99 Contact: Judith Wawroski, Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 FOR IMMEDIATE RELEASE: INTERNATIONAL BANCSHARES CORPORATION RANKED THIRD ON FORBES’ AMERICA’S BEST BANKS LIST FOR 2023 LAREDO, TEXAS – (BUSINESS WIRE) – April 12, 2024 - International Bancshares Corporation (IBC)(NASDAQ: IBOC) has once again been ranked among the nation’s best banks by Forbes Magazine.

April 12, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 12, 2024 INTERNATIONAL BANCSHARES CORPORATION (Exact name of registrant as specified in its charter) - Texas 000-9439 74-2157138 (State or other jurisdiction (Commission File (

April 3, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 3, 2024 INTERNATIONAL BANCSHARES CORPORATION (Exact name of registrant as specified in its charter) - Texas 000-9439 74-2157138 (State or other jurisdiction (Commission File (I

April 3, 2024 EX-99.1

INTERNATIONAL BANCSHARES CORPORATION RANKED #1 BY S&P GLOBAL MARKET INTELLIGENCE’S TOP 50 PUBLIC BANKS FOR 2023

EXHIBIT 99 Contact: Judith Wawroski, Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 FOR IMMEDIATE RELEASE: INTERNATIONAL BANCSHARES CORPORATION RANKED #1 BY S&P GLOBAL MARKET INTELLIGENCE’S TOP 50 PUBLIC BANKS FOR 2023 LAREDO, TEXAS – (BUSINESS WIRE) – April 3, 2024 - International Bancshares Corporation (IBC) (NASDAQ:IBOC) is proud to announce that it ranked #1 among S&P Global Market Intelligence's best-performing U.

February 26, 2024 EX-21

List of Subsidiaries of International Bancshares Corporation as of February 20, 2024

Exhibit 21 List of Subsidiaries Subsidiaries of International Bancshares Corporation Name State of Incorporation or Organization Business % of Ownership IBC Trading Company Texas Export Trading 100 % IBC Capital Corporation Delaware Investments 100 % IBC Charitable and Community Development Corporation Texas Community Development 100 % Premier Tierra Holdings, Inc.

February 26, 2024 EX-4

Description of Registrant’s Securities

Exhibit 4 DESCRIPTION OF SECURITIES REGISTERED UNDER SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 The following is a summary of International Bancshares Corporation’s (“IBC”, “we”, “us”, or “our”) classes of securities registered under Section 12 of the Securities Exchange Act of 1934 (the “Exchange Act”).

February 26, 2024 EX-97

International Bancshares Corporation Compensation Clawback Policy

Exhibit 97 INTERNATIONAL BANCSHARES CORPORATION STATEMENT OF COMPANY POLICY Securities Trades by Directors, Officers and Employees of the Company February 20, 2024 This Statement of Company Policy on Securities Trades by Directors, Officers and Employees of the Company (this “Policy Statement”) is intended to familiarize you with the obligations and responsibilities of directors, officers and employees of International Bancshares Corporation (“IBC”) and its subsidiaries under the federal securities laws of the United States.

February 26, 2024 EX-13

International Bancshares Corporation 2023 Annual Report, Exhibit 13, page 1

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.

February 26, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 26, 2024 INTERNATIONAL BANCSHARES CORPORATION (Exact name of registrant as specified in its charter) - Texas 000-9439 74-2157138 (State or other jurisdiction (Commission Fil

February 26, 2024 EX-31.A

Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31a Certification I, Dennis E. Nixon, certify that: 1. I have reviewed this Annual Report on Form 10-K of International Bancshares Corporation; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleadi

February 26, 2024 EX-31.B

Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31b Certification I, Judith I. Wawroski, certify that: 1. I have reviewed this Annual Report on Form 10-K of International Bancshares Corporation; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misle

February 26, 2024 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 0-09439 INTERNATI

February 26, 2024 EX-99.1

IBC Reports 37% Increase in Earnings in 2023

EXHIBIT 99 Contact: Judith Wawroski, Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 FOR IMMEDIATE RELEASE: IBC Reports 37% Increase in Earnings in 2023 LAREDO, Texas—(BUSINESS WIRE)— February 26, 2024—International Bancshares Corporation (NASDAQ:IBOC), one of the largest independent bank holding companies in Texas, today reported annual net income for 2023 of $411.

February 26, 2024 EX-32.B

Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32b CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of International Bancshares Corporation (the “Company”) on Form 10-K for the year ended December 31, 2023 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Judith I. Wawroski, Treasurer and P

February 26, 2024 EX-32.A

Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32a CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of International Bancshares Corporation (the “Company”) on Form 10-K for the year ended December 31, 2023 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Dennis E. Nixon, President and Prin

February 13, 2024 SC 13G/A

IBOC / International Bancshares Corporation / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv01209-internationalbancsha.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 11)* Name of issuer: International Bancshares Corp Title of Class of Securities: Common Stock CUSIP Number: 459044103 Date of Event Which Requires Filing of this Statement: December 29, 2023 Check the appropriate

February 9, 2024 SC 13G/A

IBOC / International Bancshares Corporation / DIMENSIONAL FUND ADVISORS LP - SEC SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 8 )* International Bancshares Corp (Name of Issuer) Common Stock (Title of Class of Securities) 459044103 (CUSIP Number) December 29, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to whi

February 8, 2024 SC 13G/A

IBOC / International Bancshares Corporation / WELLINGTON MANAGEMENT GROUP LLP - SEC SCHEDULE 13G Passive Investment

SC 13G/A 1 SEC13GFiling.htm SEC SCHEDULE 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1 )* International Bancshares Corporation (Name of Issuer) Common Stock (Title of Class of Securities) 459044103 (CUSIP Number) December 29, 2023 (Date of Event Which Requires Filing of this Statement) Check the a

February 1, 2024 EX-99

INTERNATIONAL BANCSHARES CORPORATION INCREASES CASH DIVIDEND BY 4.76%

EXHIBIT 99 Contact:                 Judith Wawroski Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 (Laredo) FOR IMMEDIATE RELEASE INTERNATIONAL BANCSHARES CORPORATION INCREASES CASH DIVIDEND BY 4.

February 1, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 31, 2024 INTERNATIONAL BANCSHARES CORPORATION (Exact Name of Registrant as Specified in its Charter) Texas 000-09439 74-2157138 (State or other jurisdiction of incorporation

November 2, 2023 EX-31.A

31(a) —Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(a) Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Dennis E.

November 2, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 2, 2023 INTERNATIONAL B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 2, 2023 INTERNATIONAL BANCSHARES CORPORATION (Exact name of registrant as specified in its charter) - Texas 000-9439 74-2157138 (State or other jurisdiction (Commission File

November 2, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 000-09439 INTERNATIONAL BAN

November 2, 2023 EX-99

IBC Continues to Deliver Exceptional Earnings

EXHIBIT 99 Contact: Judith Wawroski, Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 FOR IMMEDIATE RELEASE: IBC Continues to Deliver Exceptional Earnings LAREDO, Texas—(BUSINESS WIRE)— November 2, 2023—International Bancshares Corporation (NASDAQ:IBOC), one of the largest independent bank holding companies in Texas, today reported net income for the nine months ended September 30, 2023 of $305.

November 2, 2023 EX-31.B

31(b) —Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(b) Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Judith I.

November 2, 2023 EX-32.B

32(b) —Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(b) CERTIFICATION PURSUANT TO 18 U.S.C. 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of International Bancshares Corporation (the “Company”) on Form 10-Q for the period ended September 30, 2023 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Judith I. Wawroski, Principal Finan

November 2, 2023 EX-32.A

32(a) —Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(a) CERTIFICATION PURSUANT TO 18 U.S.C. 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of International Bancshares Corporation (the “Company”) on Form 10-Q for the period ended September 30, 2023, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Dennis E. Nixon, Chief Executive O

August 3, 2023 EX-32.B

32(b) —Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(b) CERTIFICATION PURSUANT TO 18 U.S.C. 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of International Bancshares Corporation (the “Company”) on Form 10-Q for the period ended June 30, 2023 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Judith I. Wawroski, Principal Financial

August 3, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 000-09439 INTERNATIONAL BANCSHAR

August 3, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 3, 2023 INTERNATIONAL BANCSHARES CORPORATION (Exact name of registrant as specified in its charter) - Texas 000-9439 74-2157138 (State or other jurisdiction (Commission File (

August 3, 2023 EX-99

IBC Continues Stellar Earnings

EXHIBIT 99 Contact: Judith Wawroski, Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 FOR IMMEDIATE RELEASE: IBC Continues Stellar Earnings LAREDO, Texas—(BUSINESS WIRE)— August 3, 2023—International Bancshares Corporation (NASDAQ:IBOC), one of the largest independent bank holding companies in Texas, today reported net income for the six months ended June 30, 2023 of $202.

August 3, 2023 EX-31.A

31(a) —Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(a) Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Dennis E.

August 3, 2023 EX-32.A

32(a) —Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(a) CERTIFICATION PURSUANT TO 18 U.S.C. 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of International Bancshares Corporation (the “Company”) on Form 10-Q for the period ended June 30, 2023, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Dennis E. Nixon, Chief Executive Office

August 3, 2023 EX-31.B

31(b) —Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(b) Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Judith I.

July 27, 2023 EX-99

INTERNATIONAL BANCSHARES CORPORATION ANNOUNCES CASH DIVIDEND

EXHIBIT 99 Contact:         Judith Wawroski Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 (Laredo) FOR IMMEDIATE RELEASE INTERNATIONAL BANCSHARES CORPORATION ANNOUNCES CASH DIVIDEND LAREDO, TX, July 27, 2023 - International Bancshares Corporation (NASDAQ: IBOC) announced today that on July 25, 2023, IBC’s Board of Directors approved the declaration of a .

July 27, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 25, 2023 INTERNATIONAL BANC

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 25, 2023 INTERNATIONAL BANCSHARES CORPORATION (Exact Name of Registrant as Specified in its Charter) Texas 000-09439 74-2157138 (State or other jurisdiction of incorporation or

May 24, 2023 EX-99

INTERNATIONAL BANCSHARES MAKES FORBES’ AMERICA’S BEST BANKS LIST

EXHIBIT 99 Contact: Judith I. Wawroski Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 FOR IMMEDIATE RELEASE: INTERNATIONAL BANCSHARES MAKES FORBES’ AMERICA’S BEST BANKS LIST LAREDO, TEXAS – (BUSINESS WIRE) – May 24, 2023 - International Bancshares Corporation (IBC)(NASDAQ: IBOC) has once again been ranked among the nation’s best banks by Forbes Magazi

May 24, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 24, 2023 INTERNATIONAL BANCSHARES CORPORATION (Exact name of registrant as specified in its charter) - Texas 000-9439 74-2157138 (State or other jurisdiction (Commission File (IR

May 17, 2023 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 15, 2023 INTERNATIONAL BANCSHARES CORPORATION (Exact name of registrant as specified in its charter) Texas 000-9439 74-2157138 (State or other jurisdiction of incorporation) (Comm

May 4, 2023 EX-99.1

IBC Continues Stellar Earnings

EXHIBIT 99 Contact: Judith Wawroski, Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 FOR IMMEDIATE RELEASE: IBC Continues Stellar Earnings LAREDO, Texas—(BUSINESS WIRE)— May 4, 2023—International Bancshares Corporation (NASDAQ:IBOC), one of the largest independent bank holding companies in Texas, today reported net income for the three months ended March 31, 2023 of $101.

May 4, 2023 EX-31.A

31(a) —Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(a) Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Dennis E.

May 4, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 000-09439 INTERNATIONAL BANCSHA

May 4, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 4, 2023 INTERNATIONAL BANCSHARES CORPORATION (Exact name of registrant as specified in its charter) - Texas 000-9439 74-2157138 (State or other jurisdiction (Commission File (IRS

May 4, 2023 EX-31.B

31(b) —Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(b) Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Judith I.

May 4, 2023 EX-32.A

32(a) —Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(a) CERTIFICATION PURSUANT TO 18 U.S.C. 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of International Bancshares Corporation (the “Company”) on Form 10-Q for the period ended March 31, 2023, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Dennis E. Nixon, Chief Executive Offic

May 4, 2023 EX-32.B

32(b) —Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(b) CERTIFICATION PURSUANT TO 18 U.S.C. 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of International Bancshares Corporation (the “Company”) on Form 10-Q for the period ended March 31, 2023 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Judith I. Wawroski, Principal Financial

April 17, 2023 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only

April 17, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (

February 23, 2023 EX-31.B

Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31b Certification I, Judith I. Wawroski, certify that: 1. I have reviewed this Annual Report on Form 10-K of International Bancshares Corporation; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misle

February 23, 2023 EX-13

International Bancshares Corporation 2022 Annual Report, Exhibit 13, page 1

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 other subsidiaries.

February 23, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 23, 2023 INTERNATIONAL

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 23, 2023 INTERNATIONAL BANCSHARES CORPORATION (Exact name of registrant as specified in its charter) - Texas 000-9439 74-2157138 (State or other jurisdiction (Commission Fil

February 23, 2023 EX-21

List of Subsidiaries of International Bancshares Corporation as of February 17, 2023

Exhibit 21 List of Subsidiaries Subsidiaries of International Bancshares Corporation Name State of Incorporation or Organization Business % of Ownership IBC Trading Company Texas Export Trading 100 % IBC Capital Corporation Texas Investments 100 % IBC Charitable and Community Development Corporation Texas Community Development 100 % Premier Tierra Holdings, Inc.

February 23, 2023 EX-31.A

Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31a Certification I, Dennis E. Nixon, certify that: 1. I have reviewed this Annual Report on Form 10-K of International Bancshares Corporation; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleadi

February 23, 2023 EX-99.1

IBC Reports Record 2022 Earnings

EXHIBIT 99 Contact: Judith Wawroski, Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 FOR IMMEDIATE RELEASE: IBC Reports Record 2022 Earnings LAREDO, Texas—(BUSINESS WIRE)— February 23, 2023—International Bancshares Corporation (NASDAQ:IBOC), one of the largest independent bank holding companies in Texas, today reported annual net income for 2022 of $300.

February 23, 2023 EX-32.A

Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32a CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of International Bancshares Corporation (the “Company”) on Form 10-K for the year ended December 31, 2022 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Dennis E. Nixon, President and Prin

February 23, 2023 EX-4

Description of Registrant’s Securities

Exhibit 4 DESCRIPTION OF SECURITIES REGISTERED UNDER SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 The following is a summary of International Bancshares Corporation’s (“IBC”, “we”, “us”, or “our”) classes of securities registered under Section 12 of the Securities Exchange Act of 1934 (the “Exchange Act”).

February 23, 2023 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 0-09439 INTERNATI

February 23, 2023 EX-32.B

Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32b CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of International Bancshares Corporation (the “Company”) on Form 10-K for the year ended December 31, 2022 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Judith I. Wawroski, Treasurer and P

February 22, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 21, 2023 INTERNATIONAL

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 21, 2023 INTERNATIONAL BANCSHARES CORPORATION (Exact Name of Registrant as Specified in its Charter) Texas 000-09439 74-2157138 (State or other Jurisdiction of incorporation

February 22, 2023 EX-3.1

—Amended and Restated By-Laws of International Bancshares Corporation.

Exhibit 3.1 AMENDED AND RESTATED BY-LAWS OF INTERNATIONAL BANCSHARES CORPORATION AS OF FEBRUARY 21, 2023 ARTICLE I OFFICES Section 1. Principal Office. The principal office of the Corporation shall be in Laredo, Texas. Section 2. Other Offices. The Corporation may also have offices at such other places both within and without the State of Texas as the Board of Directors may from time to time deter

February 10, 2023 SC 13G/A

IBOC / International Bancshares Corp / DIMENSIONAL FUND ADVISORS LP - SEC SCHEDULE 13G Passive Investment

SC 13G/A 1 SEC13GFiling.htm SEC SCHEDULE 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 7 )* International Bancshares Corp (Name of Issuer) Common Stock (Title of Class of Securities) 459044103 (CUSIP Number) December 30, 2022 (Date of Event Which Requires Filing of this Statement) Check the appropri

February 9, 2023 SC 13G/A

IBOC / International Bancshares Corp / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv01168-internationalbancsha.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 10)* Name of issuer: International Bancshares Corp. Title of Class of Securities: Common Stock CUSIP Number: 459044103 Date of Event Which Requires Filing of this Statement: December 30, 2022 Check the appropriat

February 6, 2023 SC 13G

IBOC / International Bancshares Corp / WELLINGTON MANAGEMENT GROUP LLP - SEC SCHEDULE 13G Passive Investment

SC 13G 1 SEC13GFiling.htm SEC SCHEDULE 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* International Bancshares Corporation (Name of Issuer) Common Stock (Title of Class of Securities) 459044103 (CUSIP Number) December 30, 2022 (Date of Event Which Requires Filing of this Statement) Check the appro

February 1, 2023 EX-99

INTERNATIONAL BANCSHARES CORPORATION ANNOUNCES CASH DIVIDEND INCREASE

EXHIBIT 99 Contact: Judith Wawroski Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 (Laredo) FOR IMMEDIATE RELEASE INTERNATIONAL BANCSHARES CORPORATION ANNOUNCES CASH DIVIDEND INCREASE LAREDO, TX, February 1, 2023 - International Bancshares Corporation (NASDAQ: IBOC) announced today that on January 31, 2023, IBC’s Board of Directors approved the declaration of a .

February 1, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 31, 2023 INTERNATIONAL BANCSHARES CORPORATION (Exact Name of Registrant as Specified in its Charter) Texas 000-09439 74-2157138 (State or other Jurisdiction of incorporation

November 3, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? ? FORM 8-K ? CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 ? Date of Report (Date of earliest event reported): November 3, 2022 ? ? INTERNATIONAL BANCSHARES CORPORATION (Exact name of registrant as specified in its charter) ? - ? ? ? ? Texas ? 000-9439 ? 74-2157138 (State or other j

November 3, 2022 EX-32.A

32(a) —Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(a) CERTIFICATION PURSUANT TO 18 U.S.C. 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of International Bancshares Corporation (the “Company”) on Form 10-Q for the period ended September 30, 2022, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Dennis E. Nixon, Chief Executive O

November 3, 2022 EX-31.A

31(a) —Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(a) Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Dennis E.

November 3, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2022 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 000-09439 INTERNATIONAL BAN

November 3, 2022 EX-32.B

32(b) —Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(b) CERTIFICATION PURSUANT TO 18 U.S.C. 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of International Bancshares Corporation (the “Company”) on Form 10-Q for the period ended September 30, 2022 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Judith I. Wawroski, Principal Finan

November 3, 2022 EX-31.B

31(b) —Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(b) Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Judith I.

November 3, 2022 EX-99

IBC Reports Stellar Earnings

EXHIBIT 99 ? Contact: Judith Wawroski, Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 ? FOR IMMEDIATE RELEASE: ? IBC Reports Stellar Earnings LAREDO, Texas?(BUSINESS WIRE)? November 3, 2022?International Bancshares Corporation (NASDAQ:IBOC), one of the largest independent bank holding companies in Texas, today reported net income for the three months ended September 30, 2022 was $83.

August 4, 2022 EX-31.A

31(a) —Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(a) Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Dennis E.

August 4, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 2, 2022 INTERNATIONAL BANCSHARES CORPORATION (Exact Name of Registrant as Specified in its Charter) Texas 000-09439 74-2157138 (State or other Jurisdiction of incorporation or

August 4, 2022 EX-99

INTERNATIONAL BANCSHARES CORPORATION ANNOUNCES CASH DIVIDEND

EXHIBIT 99 Contact: Judith Wawroski Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 (Laredo) FOR IMMEDIATE RELEASE INTERNATIONAL BANCSHARES CORPORATION ANNOUNCES CASH DIVIDEND LAREDO, TX, August 4, 2022 - International Bancshares Corporation (NASDAQ: IBOC) announced today that on August 2, 2022, IBC?s Board of Directors approved the declaration of a .

August 4, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 4, 2022 INTERNATIONAL BANCSHARES CORPORATION (Exact name of registrant as specified in its charter) - Texas 000-9439 74-2157138 (State or other jurisdiction (Commission File (

August 4, 2022 EX-32.A

32(a) —Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(a) CERTIFICATION PURSUANT TO 18 U.S.C. 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of International Bancshares Corporation (the “Company”) on Form 10-Q for the period ended June 30, 2022, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Dennis E. Nixon, Chief Executive Office

August 4, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? FORM 10-Q ? ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 ? For the quarterly period ended June 30, 2022 OR ? ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 ? For the transition period from to ? Commission file number 000-09439 ? INTE

August 4, 2022 EX-31.B

31(b) —Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(b) Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Judith I.

August 4, 2022 EX-99

IBC Reports Strong Earnings

EXHIBIT 99 ? Contact: Judith Wawroski, Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 ? FOR IMMEDIATE RELEASE: ? IBC Reports Strong Earnings LAREDO, Texas?(BUSINESS WIRE)? August 4, 2022?International Bancshares Corporation (NASDAQ:IBOC), one of the largest independent bank holding companies in Texas, today reported net income for the first six months of 2022 of $111.

August 4, 2022 EX-32.B

32(b) —Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(b) CERTIFICATION PURSUANT TO 18 U.S.C. 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of International Bancshares Corporation (the “Company”) on Form 10-Q for the period ended June 30, 2022 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Judith I. Wawroski, Principal Financial

June 9, 2022 SC 13G/A

IBOC / International Bancshares Corp / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 9)* Name of issuer: International Bancshares Corp. Title of Class of Securities: Common Stock CUSIP Number: 459044103 Date of Event Which Requires Filing of this Statement: May 31, 2022 Check the appropriate box to designate the rule pursuant to which this Schedule is fi

May 19, 2022 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 16, 2022 INTERNATIONAL BANCSHARES CORPORATION (Exact name of registrant as specified in its charter) Texas 000-9439 74-2157138 (State or other jurisdiction of incorporation (Comm

May 5, 2022 EX-31.A

31(a) —Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(a) Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Dennis E.

May 5, 2022 EX-32.A

32(a) —Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(a) ? CERTIFICATION PURSUANT TO 18 U.S.C. 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 ? In connection with the Quarterly Report of International Bancshares Corporation (the ?Company?) on Form 10-Q for the period ended March 31, 2022, as filed with the Securities and Exchange Commission on the date hereof (the ?Report?), I, Dennis E. Nixon, Chief Executive O

May 5, 2022 EX-32.B

32(b) —Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(b) CERTIFICATION PURSUANT TO 18 U.S.C. 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of International Bancshares Corporation (the “Company”) on Form 10-Q for the period ended March 31, 2022 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Judith I. Wawroski, Principal Financial

May 5, 2022 EX-31.B

31(b) —Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(b) Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Judith I.

May 5, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? ? FORM 8-K ? CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 ? Date of Report (Date of earliest event reported): May 5, 2022 ? ? INTERNATIONAL BANCSHARES CORPORATION (Exact name of registrant as specified in its charter) ? - ? ? ? ? Texas ? 000-9439 ? 74-2157138 (State or other jurisd

May 5, 2022 EX-99

IBC Reports Strong Earnings

EXHIBIT 99 ? Contact: Judith Wawroski, Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 ? FOR IMMEDIATE RELEASE: ? IBC Reports Strong Earnings LAREDO, Texas?(BUSINESS WIRE)? May 5, 2022?International Bancshares Corporation (NASDAQ:IBOC), one of the largest independent bank holding companies in Texas, today reported net income for the first three months of 2022 of $53.

May 5, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? FORM 10-Q ? ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 ? For the quarterly period ended March 31, 2022 OR ? ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 ? For the transition period from to ? Commission file number 000-09439 ? INT

April 19, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 18, 2022 INTERNATIONAL BANCSHARES CORPORATION (Exact Name of Registrant as Specified in its Charter) Texas 000-09439 74-2157138 (State or other Jurisdiction of incorporation or

April 19, 2022 EX-10.1

2022 International Bancshares Corporation Stock Appreciation Rights Plan dated April 18, 2022

Exhibit 10.1 2022 INTERNATIONAL BANCSHARES CORPORATION STOCK APPRECIATION RIGHTS PLAN The 2022 INTERNATIONAL BANCSHARES CORPORATION STOCK APPRECIATION RIGHTS PLAN (the ?Plan?) is intended to advance the interests of the Company and its shareholders by affording officers, employees, consultants and advisors of the Company and its Subsidiaries an opportunity to participate in the Company?s growth by

April 19, 2022 EX-10.3

2022 International Bancshares Corporation Amended and Restated Management Incentive Plan

Exhibit 10.3 INTERNATIONAL BANCSHARES CORPORATION 2022 MANAGEMENT INCENTIVE PLAN SECTION I PURPOSE The purpose of the International Bancshares Corporation 2022 Management Incentive Plan (the ?Plan?) is to promote and advance the interests of the Company and its shareholders by enabling the Company to attract, retain and reward officers of the Company and its Affiliates. The Plan is an amendment an

April 19, 2022 EX-10.2

Form of Stock Appreciation Rights Award Agreement

Exhibit 10.2 2022 INTERNATIONAL BANCSHARES CORPORATION STOCK APPRECIATION RIGHTS PLAN STOCK APPRECIATION RIGHTS AWARD AGREEMENT This Stock Appreciation Rights Award Agreement (this ?Agreement?) is made and entered into as of [DATE] by and between INTERNATIONAL BANCSHARES CORPORATION, a Texas corporation (the ?Company?) and [EMPLOYEE NAME] (the ?Participant?). Grant Date: Number of Stock Appreciati

April 18, 2022 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   )

? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549? SCHEDULE 14A (Rule 14a101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.?? ) Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? ? Confidential, for Use of the Commission O

April 18, 2022 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   )

DEFA14A 1 tm223620-3defa14a.htm DEFA14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confid

April 1, 2022 8-K

Regulation FD Disclosure, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 23, 2022 INTERNATIONAL BANCSHARES CORPORATION (Exact Name of Registrant as Specified in its Charter) Texas 000-09439 74-2157138 (State or other Jurisdiction of incorporation

February 28, 2022 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 23, 2022 INTERNATIONAL BANCSHARES CORPORATION (Exact Name of Registrant as Specified in its Charter) Texas 000-09439 74-2157138 (State or other Jurisdiction of incorporation

February 28, 2022 EX-99

INTERNATIONAL BANCSHARES CORPORATION ANNOUNCES APPOINTMENT OF NEW DIRECTOR

EX-99 2 tm227684d1ex99.htm EXHIBIT 99 EXHIBIT 99 Contact: Judith Wawroski Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 (Laredo) FOR IMMEDIATE RELEASE INTERNATIONAL BANCSHARES CORPORATION ANNOUNCES APPOINTMENT OF NEW DIRECTOR LAREDO, Texas – (Business Wire) - February 28, 2022 - International Bancshares Corporation (“IBC”) (NASDAQ: IBOC) announced to

February 24, 2022 EX-32.B

Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32b CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of International Bancshares Corporation (the “Company”) on Form 10-K for the year ended December 31, 2021 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Judith I. Wawroski, Treasurer and P

February 24, 2022 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Table of Contents ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

February 24, 2022 EX-32.A

Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32a CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of International Bancshares Corporation (the “Company”) on Form 10-K for the year ended December 31, 2021 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Dennis E. Nixon, President and Prin

February 24, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? ? FORM 8-K ? CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 ? Date of Report (Date of earliest event reported): February 24, 2022 ? ? INTERNATIONAL BANCSHARES CORPORATION (Exact name of registrant as specified in its charter) ? - ? ? ? ? Texas ? 000-9439 ? 74-2157138 (State or other

February 24, 2022 EX-31.B

Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31b Certification I, Judith I. Wawroski, certify that: 1. I have reviewed this Annual Report on Form 10-K of International Bancshares Corporation; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misle

February 24, 2022 EX-21

List of Subsidiaries of International Bancshares Corporation as of February 18, 2022

Exhibit 21 List of Subsidiaries Subsidiaries of International Bancshares Corporation ? ? ? ? ? ? ? ? Name State of Incorporation or Organization Business % of Ownership IBC Trading Company ? Texas ? Export Trading ? 100 % IBC Capital Corporation ? Texas ? Investments ? 100 % IBC Charitable and Community Development Corporation ? Texas ? Community Development ? 100 % Premier Tierra Holdings, Inc.

February 24, 2022 EX-31.A

Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31a Certification I, Dennis E. Nixon, certify that: 1. I have reviewed this Annual Report on Form 10-K of International Bancshares Corporation; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleadi

February 24, 2022 EX-13

International Bancshares Corporation 2021 Annual Report, Exhibit 13, page 1

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 other subsidiaries.

February 24, 2022 EX-4

Description of Registrant’s Securities

Exhibit 4 ? DESCRIPTION OF SECURITIES REGISTERED UNDER SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 The following is a summary of International Bancshares Corporation?s (?IBC?, ?we?, ?us?, or ?our?) classes of securities registered under Section 12 of the Securities Exchange Act of 1934 (the ?Exchange Act?).

February 24, 2022 EX-99

IBC Reports 2021 Earnings

EX-99 2 iboc-20220224xex99.htm EX-99 EXHIBIT 99 Contact: Judith Wawroski, Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 FOR IMMEDIATE RELEASE: IBC Reports 2021 Earnings LAREDO, Texas—(BUSINESS WIRE)— February 24, 2022—International Bancshares Corporation (NASDAQ:IBOC), one of the largest independent bank holding companies in Texas, today reported ann

February 10, 2022 SC 13G/A

IBOC / International Bancshares Corp / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 8)* Name of issuer: International Bancshares Corp. Title of Class of Securities: Common Stock CUSIP Number: 459044103 Date of Event Which Requires Filing of this Statement: December 31, 2021 Check the appropriate box to designate the rule pursuant to which this Schedule

February 8, 2022 SC 13G/A

IBOC / International Bancshares Corp / DIMENSIONAL FUND ADVISORS LP - SEC SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 6 )* International Bancshares Corp (Name of Issuer) Common Stock (Title of Class of Securities) 459044103 (CUSIP Number) December 31, 2021 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to whi

February 4, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 3, 2022 INTERNATIONAL BANCSHARES CORPORATION (Exact Name of Registrant as Specified in its Charter) Texas 000-09439 74-2157138 (State or other Jurisdiction of incorporation

February 4, 2022 EX-99

INTERNATIONAL BANCSHARES CORPORATION ANNOUNCES CASH DIVIDEND

EXHIBIT 99 Contact: Judith Wawroski Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 (Laredo) FOR IMMEDIATE RELEASE INTERNATIONAL BANCSHARES CORPORATION ANNOUNCES CASH DIVIDEND LAREDO, TX, February 4, 2022 - International Bancshares Corporation (?IBC?) announced today that on February 3, 2022, IBC?s Board of Directors approved the declaration of a .

November 4, 2021 EX-32.B

32(b) —Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(b) CERTIFICATION PURSUANT TO 18 U.S.C. 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of International Bancshares Corporation (the “Company”) on Form 10-Q for the period ended September 30, 2021 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Judith I. Wawroski, Principal Finan

November 4, 2021 EX-99

IBC Reports Strong Earnings

EX-99 2 iboc-20211104xex99.htm EX-99 EXHIBIT 99 Contact: Judith Wawroski, Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 FOR IMMEDIATE RELEASE: IBC Reports Strong Earnings LAREDO, Texas—(BUSINESS WIRE)— November 4, 2021—International Bancshares Corporation (NASDAQ:IBOC), one of the largest independent bank holding companies in Texas, today reported ne

November 4, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? FORM 10-Q ? ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 ? For the quarterly period ended September 30, 2021 OR ? ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 ? For the transition period from to ? Commission file number 000-09439 ?

November 4, 2021 EX-31.B

31(b) —Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(b) Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Judith I.

November 4, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? ? FORM 8-K ? CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 ? Date of Report (Date of earliest event reported): November 4, 2021 ? ? INTERNATIONAL BANCSHARES CORPORATION (Exact name of registrant as specified in its charter) ? - ? ? ? ? Texas ? 000-9439 ? 74-2157138 (State or other j

November 4, 2021 EX-31.A

31(a) —Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(a) Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Dennis E.

November 4, 2021 EX-32.A

32(a) —Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(a) ? CERTIFICATION PURSUANT TO 18 U.S.C. 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 ? In connection with the Quarterly Report of International Bancshares Corporation (the ?Company?) on Form 10-Q for the period ended September 30, 2021, as filed with the Securities and Exchange Commission on the date hereof (the ?Report?), I, Dennis E. Nixon, Chief Executi

August 9, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 3, 2021 INTERNATIONAL BANCSHARES CORPORATION (Exact Name of Registrant as Specified in its Charter) Texas 000-09439 74-2157138 (State or other Jurisdiction of incorporation or

August 9, 2021 EX-99

INTERNATIONAL BANCSHARES CORPORATION ANNOUNCES CASH DIVIDEND INCREASE

EXHIBIT 99 Contact: Judith Wawroski Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 (Laredo) FOR IMMEDIATE RELEASE INTERNATIONAL BANCSHARES CORPORATION ANNOUNCES CASH DIVIDEND INCREASE LAREDO, TX, August 9, 2021 - International Bancshares Corporation (?IBC?) announced today that on August 3, 2021, IBC?s Board of Directors approved the declaration of a .

August 5, 2021 EX-32.(B)

32(b) —Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(b) ? CERTIFICATION PURSUANT TO 18 U.S.C. 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 ? In connection with the Quarterly Report of International Bancshares Corporation (the ?Company?) on Form 10-Q for the period ended June 30, 2021 as filed with the Securities and Exchange Commission on the date hereof (the ?Report?), I, Judith I. Wawroski, Principal Financ

August 5, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? ? FORM 8-K ? CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 ? Date of Report (Date of earliest event reported): August 5, 2021 ? ? INTERNATIONAL BANCSHARES CORPORATION (Exact name of registrant as specified in its charter) ? - ? ? ? ? Texas ? 000-9439 ? 74-2157138 (State or other jur

August 5, 2021 EX-99.1

IBC Reports Strong Earnings

EXHIBIT 99 Contact: Judith Wawroski, Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 FOR IMMEDIATE RELEASE: IBC Reports Strong Earnings LAREDO, Texas—(BUSINESS WIRE)— August 5, 2021—International Bancshares Corporation (NASDAQ:IBOC), one of the largest independent bank holding companies in Texas, today reported net income for the three months ended June 30, 2021 was $92.

August 5, 2021 EX-31.(B)

31(b) —Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(b) ? Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 ? I, Judith I.

August 5, 2021 EX-32.(A)

32(a) —Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(a) CERTIFICATION PURSUANT TO 18 U.S.C. 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of International Bancshares Corporation (the “Company”) on Form 10-Q for the period ended June 30, 2021, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Dennis E. Nixon, Chief Executive Office

August 5, 2021 EX-31.(A)

31(a) —Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(a) Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Dennis E.

August 5, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? FORM 10-Q ? ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 ? For the quarterly period ended June 30, 2021 OR ? ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 ? For the transition period from to ? Commission file number 000-09439 ? INTE

July 21, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Other Events

? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? FORM 8-K ? CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 ? Date of Report (Date of earliest event reported): July 21, 2021 ? INTERNATIONAL BANCSHARES CORPORATION (Exact name of registrant as specified in its charter) ? - ? ? ? ? Texas ? 000-9439 ? 74-2157138 (State or other jurisdic

July 21, 2021 EX-99

FORBES GIVES HIGH RANKS TO IBC BANKS

EXHIBIT 99 ? Contact: Gabriel Castillo Marcie Hernandez International Bancshares Corporation KGBTexas Communications (956) 722-7611 (210) 826-8899 ? ? ? marciehernandez@kgbtexas.

May 20, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 17, 2021 INTERNATIONAL BANCSHARES CORPORATION (Exact name of registrant as specified in its charter) Texas 000-9439 74-2157138 (State or other jurisdiction (Commission File (IRS

May 7, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 7, 2021 INTERNATIONAL BANCSHARES CORPORATION (Exact Name of Registrant as Specified in its Charter) Texas 000-09439 74-2157138 (State or other Jurisdiction (Commission File Numbe

May 7, 2021 EX-99

INTERNATIONAL BANCSHARES CORPORATION CONFIRMS 2021 ANNUAL SHAREHOLDERS MEETING TO BE HELD IN-PERSON

EXHIBIT 99 FOR IMMEDIATE RELEASE Contact: Judith Wawroski Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 (Laredo) INTERNATIONAL BANCSHARES CORPORATION CONFIRMS 2021 ANNUAL SHAREHOLDERS MEETING TO BE HELD IN-PERSON LAREDO, TX, May 7, 2020 - International Bancshares Corporation (?IBC?) announced today that, on May 4, 2021, our Board of Directors ratified its prior approval of holding IBC?s 2020 Annual Shareholders Meeting scheduled for May 17, 2021, in-person as planned and disclosed in our shareholders letter dated April 16, 2021.

May 6, 2021 EX-31.(B)

31(b) —Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(b) Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Judith I.

May 6, 2021 EX-32.(A)

32(a) —Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(a) CERTIFICATION PURSUANT TO 18 U.S.C. 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of International Bancshares Corporation (the “Company”) on Form 10-Q for the period ended March 31, 2021, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Dennis E. Nixon, Chief Executive Offic

May 6, 2021 EX-99

Judith Wawroski,

EXHIBIT 99 ? Contact: Judith Wawroski, Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 ? FOR IMMEDIATE RELEASE: ? IBC Reports Strong First Quarter 2021 Earnings LAREDO, Texas?(BUSINESS WIRE)? May 6, 2021?International Bancshares Corporation (NASDAQ:IBOC), one of the largest independent bank holding companies in Texas, today reported net income for the three months ended March 31, 2021 was approximately $50.

May 6, 2021 EX-32.(B)

32(b) —Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(b) CERTIFICATION PURSUANT TO 18 U.S.C. 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of International Bancshares Corporation (the “Company”) on Form 10-Q for the period ended March 31, 2021 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Judith I. Wawroski, Principal Financial

May 6, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? ? FORM 8-K ? CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 ? Date of Report (Date of earliest event reported): May 6, 2021 ? ? INTERNATIONAL BANCSHARES CORPORATION (Exact name of registrant as specified in its charter) ? - ? ? ? ? Texas ? 000-9439 ? 74-2157138 (State or other jurisd

May 6, 2021 EX-31.(A)

31(a) —Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(a) ? Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 ? I, Dennis E.

May 6, 2021 10-Q

Quarterly Report - 10-Q

? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? FORM 10-Q ? ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 ? For the quarterly period ended March 31, 2021 OR ? ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 ? For the transition period from to ? Commission file number 000-09439 ? INT

April 16, 2021 DEFA14A

- DEFA14A

? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ??) Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ?

April 16, 2021 DEF 14A

- DEF 14A

? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? ? Definitive Proxy

February 25, 2021 EX-31.A

Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31a Certification I, Dennis E. Nixon, certify that: 1. I have reviewed this Annual Report on Form 10-K of International Bancshares Corporation; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleadi

February 25, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ? ? FORM 8-K ? CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 ? Date of Report (Date of earliest event reported): February 25, 2021 ? ? INTERNATIONAL BANCSHARES CORPORATION (Exact name of registrant as specified in its charter) ? - ? ? ? ? Texas ? 000-9439 ? 74-2157138 (State or other

February 25, 2021 EX-32.A

Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32a CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of International Bancshares Corporation (the ?Company?) on Form 10-K for the year ended December 31, 2020 as filed with the Securities and Exchange Commission on the date hereof (the ?Report?), I, Dennis E. Nixon, President and Prin

February 25, 2021 EX-4

Description of Registrant’s Securities

Exhibit 4 ? DESCRIPTION OF SECURITIES REGISTERED UNDER SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 The following is a summary of International Bancshares Corporation?s (?IBC?, ?we?, ?us?, or ?our?) classes of securities registered under Section 12 of the Securities Exchange Act of 1934 (the ?Exchange Act?).

February 25, 2021 10-K

Annual Report - 10-K

Table of Contents ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

February 25, 2021 EX-99

IBC Reports 2020 Earnings

EXHIBIT 99 ? Contact: Judith Wawroski, Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 ? FOR IMMEDIATE RELEASE: ? IBC Reports 2020 Earnings ? LAREDO, Texas?(BUSINESS WIRE)? February 25, 2021?International Bancshares Corporation (NASDAQ:IBOC), one of the largest independent bank holding companies in Texas, today reported annual net income for 2020 of $167.

February 25, 2021 EX-31.B

Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31b Certification I, Judith I. Wawroski, certify that: 1. I have reviewed this Annual Report on Form 10-K of International Bancshares Corporation; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misle

February 25, 2021 EX-21

List of Subsidiaries of International Bancshares Corporation as of February 22, 2021

Exhibit 21 List of Subsidiaries Subsidiaries of International Bancshares Corporation ? ? ? ? ? ? ? ? Name State of Incorporation or Organization Business % of Ownership IBC Trading Company ? Texas ? Export Trading ? 100 % IBC Capital Corporation ? Texas ? Investments ? 100 % IBC Charitable and Community Development Corporation ? Texas ? Community Development ? 100 % Premier Tierra Holdings, Inc.

February 25, 2021 EX-32.B

Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32b CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Annual Report of International Bancshares Corporation (the “Company”) on Form 10-K for the year ended December 31, 2020 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Judith I. Wawroski, Treasurer and P

February 25, 2021 EX-13

International Bancshares Corporation 2020 Annual Report, Exhibit 13, page 1

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 other subsidiaries.

February 12, 2021 SC 13G/A

SCHEDULE 13G

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 5 )* International Bancshares Corp (Name of Issuer) Common Stock (Title of Class of Securities) 459044103 (CUSIP Number) December 31, 2020 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to whi

February 10, 2021 SC 13G/A

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 7)*

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 7)* Name of issuer: International Bancshares Corp. Title of Class of Securities: Common Stock CUSIP Number: 459044103 Date of Event Which Requires Filing of this Statement: December 31, 2020 Check the appropriate box to designate the rule pursuant to which this Schedule

January 25, 2021 EX-99

INTERNATIONAL BANCSHARES CORPORATION ANNOUNCES CASH DIVIDEND

EXHIBIT 99 Contact: Judith Wawroski Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 (Laredo) FOR IMMEDIATE RELEASE INTERNATIONAL BANCSHARES CORPORATION ANNOUNCES CASH DIVIDEND LAREDO, TX, January 25, 2021 - International Bancshares Corporation (“IBC”) announced today that on January 22, 2021, IBC’s Board of Directors approved the early declaration of a .

January 25, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 22, 2021 INTERNATIONAL BANCSHARES CORPORATION (Exact Name of Registrant as Specified in its Charter) Texas 000-09439 74-2157138 (State or other Jurisdiction (Commission File

November 5, 2020 EX-31.(A)

31(a) —Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(a) Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Dennis E.

November 5, 2020 EX-99

IBC Reports 2020 Earnings

EXHIBIT 99 Contact: Judith Wawroski, Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 FOR IMMEDIATE RELEASE: IBC Reports 2020 Earnings LAREDO, Texas—(BUSINESS WIRE)— November 5, 2020—International Bancshares Corporation (NASDAQ:IBOC), one of the largest independent bank holding companies in Texas, today reported net income for the three months ended September 30, 2020 was $42.

November 5, 2020 EX-32.(A)

32(a) —Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(a) CERTIFICATION PURSUANT TO 18 U.S.C. 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of International Bancshares Corporation (the “Company”) on Form 10-Q for the period ended September 30, 2020, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Dennis E. Nixon, Chief Executive O

November 5, 2020 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 5, 2020 INTERNATIONAL BANCSHARES CORPORATION (Exact name of registrant as specified in its charter) - Texas 000-9439 74-2157138 (State or other jurisdiction (Commission File

November 5, 2020 EX-31.(B)

31(b) —Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(b) Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Judith I.

November 5, 2020 EX-32.(B)

32(b) —Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(b) CERTIFICATION PURSUANT TO 18 U.S.C. 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of International Bancshares Corporation (the “Company”) on Form 10-Q for the period ended September 30, 2020 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Judith I. Wawroski, Principal Finan

November 5, 2020 10-Q

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 000-09439 INTERNATIONAL BAN

September 11, 2020 SC 13D/A

IBOC / International Bancshares Corp. / SANCHEZ ANTONIO R JR - SCHEDULE 13D/A Activist Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D/A Under the Securities Exchange Act of 1934 (Amendment No. 11)* International Bancshares Corporation (Name of Issuer) Common Stock, Par Value $1.00 (Title of Class of Securities) 459044 103 (CUSIP Number) Jeffrey C. Gifford, Esq. Dykema Gossett PLLC 112 E. Pecan Street, Suite 1800 San Antonio, Texas 78205 (210) 554-5500 (Name,

September 8, 2020 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Other Events - FORM 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 4, 2020 INTERNATIONAL BANCSHARES CORPORATION (Exact Name of Registrant as Specified in its Charter) Texas 000-09439 74-2157138 (State or other Jurisdiction (Commission File

September 8, 2020 EX-99

INTERNATIONAL BANCSHARES CORPORATION ANNOUNCES CASH DIVIDEND

EXHIBIT 99 Contact: Judith Wawroski Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 (Laredo) FOR IMMEDIATE RELEASE INTERNATIONAL BANCSHARES CORPORATION ANNOUNCES CASH DIVIDEND LAREDO, TX, September 8, 2020 - International Bancshares Corporation (“IBC”) announced today that on September 4, 2020, IBC’s Board of Directors approved the declaration of a .

August 6, 2020 EX-32.(A)

32(a) —Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(a) CERTIFICATION PURSUANT TO 18 U.S.C. 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of International Bancshares Corporation (the “Company”) on Form 10-Q for the period ended June 30, 2020, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Dennis E. Nixon, Chief Executive Office

August 6, 2020 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 6, 2020 INTERNATIONAL BANCSHARES CORPORATION (Exact name of registrant as specified in its charter) - Texas 000-9439 74-2157138 (State or other jurisdiction (Commission File (

August 6, 2020 EX-99

IBC Reports 2020 Earnings

EXHIBIT 99 Contact: Judith Wawroski, Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 FOR IMMEDIATE RELEASE: IBC Reports 2020 Earnings LAREDO, Texas—(BUSINESS WIRE)— August 6, 2020—International Bancshares Corporation (NASDAQ:IBOC), one of the largest independent bank holding companies in Texas, today reported net income for the three months ended June 30, 2020 was $41.

August 6, 2020 EX-31.(A)

31(a) —Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(a) Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Dennis E.

August 6, 2020 EX-31.(B)

31(b) —Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(b) Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Judith I.

August 6, 2020 10-Q

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 000-09439 INTERNATIONAL BANCSHAR

August 6, 2020 EX-32.(B)

32(b) —Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(b) CERTIFICATION PURSUANT TO 18 U.S.C. 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of International Bancshares Corporation (the “Company”) on Form 10-Q for the period ended June 30, 2020 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Judith I. Wawroski, Principal Financial

June 10, 2020 SC 13G/A

IBOC / International Bancshares Corp. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 6)* Name of issuer: International Bancshares Corp. Title of Class of Securities: Common Stock CUSIP Number: 459044103 Date of Event Which Requires Filing of this Statement: May 29, 2020 Check the appropriate box to designate the rule pursuant to which this Schedule is fi

May 21, 2020 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 18, 2020 INTERNATIONAL BANCSHARES CORPORATION (Exact name of registrant as specified in its charter) Texas 000-9439 74-2157138 (State or other jurisdiction (Commission File (IRS

May 8, 2020 EX-99

INTERNATIONAL BANCSHARES CORPORATION CONFIRMS 2020 ANNUAL SHAREHOLDERS MEETING TO BE HELD IN-PERSON

EXHIBIT 99 FOR IMMEDIATE RELEASE Contact: Judith Wawroski Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 (Laredo) INTERNATIONAL BANCSHARES CORPORATION CONFIRMS 2020 ANNUAL SHAREHOLDERS MEETING TO BE HELD IN-PERSON LAREDO, TX, May 8, 2020 - International Bancshares Corporation (“IBC”) announced today that, on May 5, 2020, our Board of Directors approved holding IBC’s 2020 Annual Shareholders Meeting in-person as planned and disclosed in our shareholders letter dated April 17, 2020.

May 8, 2020 EX-99.1

IBC Reports First Quarter 2020 Earnings

EXHIBIT 99 Contact: Judith Wawroski, Treasurer and Principal Financial Officer International Bancshares Corporation (956) 722-7611 FOR IMMEDIATE RELEASE: IBC Reports First Quarter 2020 Earnings LAREDO, Texas—(BUSINESS WIRE)— May 7, 2020—International Bancshares Corporation (NASDAQ:IBOC), one of the largest independent bank holding companies in Texas, today reported net income for the three months ended March 31, 2020 was $34.

May 8, 2020 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 7, 2020 INTERNATIONAL BANCSHARES CORPORATION (Exact name of registrant as specified in its charter) - Texas 000-9439 74-2157138 (State or other jurisdiction (Commission File (IRS

May 8, 2020 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 8, 2020 INTERNATIONAL BANCSHARES CORPORATION (Exact Name of Registrant as Specified in its Charter) Texas 000-09439 74-2157138 (State or other Jurisdiction (Commission File (I.R.

May 7, 2020 EX-32.(B)

32(b) —Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(b) CERTIFICATION PURSUANT TO 18 U.S.C. 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of International Bancshares Corporation (the “Company”) on Form 10-Q for the period ended March 31, 2020 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Judith I. Wawroski, Principal Financial

May 7, 2020 EX-31.(A)

31(a) —Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(a) Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Dennis E.

May 7, 2020 10-Q

Quarterly Report - 10-Q

bv UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 000-09439 INTERNATIONAL BANC

May 7, 2020 EX-32.(A)

32(a) —Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Exhibit 32(a) CERTIFICATION PURSUANT TO 18 U.S.C. 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of International Bancshares Corporation (the “Company”) on Form 10-Q for the period ended March 31, 2020, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Dennis E. Nixon, Chief Executive Offic

May 7, 2020 EX-31.(B)

31(b) —Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

Exhibit 31(b) Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Judith I.

April 17, 2020 DEF 14A

IBOC / International Bancshares Corp. DEF 14A - - DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a‑6(e)(2)) ☒ Defin

April 17, 2020 DEFA14A

IBOC / International Bancshares Corp. DEFA14A - - DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ý Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) o Defin

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