IBOC · Annual Report (Form 10-K) · Filed February 26, 2026

International Bancshares Corp — 10-K exhibit

iboc-20251231xex21.htm

International Bancshares Corp on Boardroom Alpha

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.		Texas		Liquidating Subsidiary		100	%
International Bank of Commerce		Texas		State Bank		100	%
Commerce Bank		Texas		State Bank		100	%
International Bank of Commerce, Zapata		Texas		State Bank		100	%
International Bank of Commerce, Brownsville		Texas		State Bank		100	%
International Bank of Commerce, Oklahoma		Oklahoma		State Bank		100	%
WCMH, LLC		Texas		Merchant Banking		100	%
Diamond Beach Holdings, LLC		Texas		Merchant Banking		100	%
Gulfstar Merchant Banking I, Ltd.		Texas		Merchant Banking		70	%
Gulfstar Merchant Banking II, Ltd.		Texas		Merchant Banking		70	%
Gulfstar Merchant Banking III, Ltd.		Texas		Merchant Banking		50	%
Gulfstar Merchant Banking IV, Ltd.		Texas		Merchant Banking		50	%

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