EX-21 3 a2223136zex-21.htm EX-21
QuickLinks -- Click here to rapidly navigate through this document

Exhibit 21

List of Subsidiaries

Subsidiaries of International Bancshares Corporation

Name |  | State of Incorporation or Organization |  | Business |  | % of Ownership |
--- | --- | --- | --- | --- | --- | --- | ---
IBC Subsidiary Corporation |  | Delaware |  | Bank Holding Company |  |  | 100 | %
IBC Life Insurance Company |  | Texas |  | Credit Life Insurance |  |  | 100 | %
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. |  | Texas |  | Liquidating Subsidiary |  |  | 100 | %

Subsidiaries of IBC Subsidiary Corporation

Name |  | State of Incorporation or Organization |  | Business |  | % of Ownership |
--- | --- | --- | --- | --- | --- | --- | ---
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 | %
Gulfstar Merchant Banking I, Ltd. |  | Texas |  | Investment and 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 | %

QuickLinks

Exhibit 21

List of Subsidiaries
Subsidiaries of International Bancshares Corporation
Subsidiaries of IBC Subsidiary Corporation