International Bancshares trust distributes 25K shares

Other reported position entries list directly held shares, a grandchildren’s trust, and a partnership.

Rhea-AI Filing Summary

Antonio R. Sanchez Jr. reported disposition transactions in this Form 4 filing. International Bancshares Corp. (IBOC) reported that a trust for which director and ten percent owner Antonio R. Sanchez Jr. serves as co-trustee distributed 25,000 common shares to a beneficiary on October 21, 2026. The reported position held in trust following the distribution was 1,207,245 shares. For the securities in this transaction, Sanchez disclaimed beneficial ownership except to the extent of any pecuniary interest. Other reported positions included 1,805,554 shares held directly, 9,000 shares held by a grandchildren’s trust, and 447,439 shares held in a partnership.

Insider Trade Summary

Other: 25,000 shares

Other 4 txns

Insider SANCHEZ ANTONIO R JR

Role Director, 10% Owner

Type	Security	Shares	Price	Value
Other	Common Stock F1, F2	25,000	$0.00	$0.00
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 1,207,245 shares (Indirect, Held in Trust); Common Stock — 1,805,554 shares (Direct); Common Stock — 9,000 shares (Indirect, Held by Grandchildren's Trust); Common Stock — 447,439 shares (Indirect, Held in Partnership)

Footnotes (2)

1. F1. On October 21, 2026, a trust for which the reporting person serves as co-trustee distributed 25,000 shares to a beneficiary of the trust.
2. F2. The reporting person disclaims beneficial ownership of the securities except to the extent of the pecuniary interest therein, if any.

Key Figures

Shares distributed by trust: 25,000 shares Shares held in trust: 1,207,245 shares Directly held shares: 1,805,554 shares +2 more

5 metrics

Shares distributed by trust 25,000 shares Distributed to a beneficiary on October 21, 2026

Shares held in trust 1,207,245 shares Reported following the October 21, 2026 transaction

Directly held shares 1,805,554 shares Reported position on October 21, 2026

Shares held by grandchildren’s trust 9,000 shares Reported position on October 21, 2026

Shares held in partnership 447,439 shares Reported position on October 21, 2026

Key Terms

co-trustee, beneficial ownership, pecuniary interest

3 terms

co-trustee financial

"serves as co-trustee"

beneficial ownership financial

"disclaims beneficial ownership of the securities"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

pecuniary interest financial

"except to the extent of the pecuniary interest therein"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many IBOC shares did the trust distribute?

A trust for which director and ten percent owner Antonio R. Sanchez Jr. serves as co-trustee distributed 25,000 IBOC common shares to a beneficiary on October 21, 2026. Its reported post-transaction position was 1,207,245 shares.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/23/2026 - 01:24 PM EDT Accepted by SEC EDGAR 10/23/2026 - 01:24 PM EDT Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

SANCHEZ ANTONIO R JR

(Last) (First) (Middle)

1360 POST OAK BLVD STE 2400

(Street)

HOUSTON TEXAS 77056

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
INTERNATIONAL BANCSHARES CORP [ IBOC ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/21/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock								1,805,554	D
Common Stock								9,000	I	Held by Grandchildren's Trust
Common Stock								447,439	I	Held in Partnership
Common Stock	10/21/2026		J		25,000	D	$0	1,207,245(1)(2)	I	Held in Trust

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. On October 21, 2026, a trust for which the reporting person serves as co-trustee distributed 25,000 shares to a beneficiary of the trust.

2. The reporting person disclaims beneficial ownership of the securities except to the extent of the pecuniary interest therein, if any.

	/s/ ANTONIO R. SANCHEZ JR.	10/23/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)