EX-21 8 a2106638zex-21.htm EXHIBIT 21
QuickLinks -- Click here to rapidly navigate through this document


"EXHIBIT 21"


List of Subsidiaries

Subsidiaries of International Bancshares Corporation

Name

  Business
  % of Ownership
 
IBC Subsidiary Corporation   Bank Holding Company   100 %
IBC Life Insurance Company   Credit Life Insurance   100 %
IBC Trading Company   Export Trading   100 %
IBC Capital Corporation   Investments   100 %
IB Capital Trust I   Capital Securities   100 %
IB Capital Trust II   Capital Securities   100 %
IB Capital Trust III   Capital Securities   100 %
IB Capital Trust IV   Capital Securities   100 %
IB Capital Trust V   Capital Securities   100 %
IB Capital Trust VI   Capital Securities   100 %

Subsidiaries of IBC Subsidiary Corporation

Name

  Business
  % of Ownership
 
International Bank of Commerce   State Bank   100 %
Commerce Bank   State Bank   100 %
International Bank of Commerce, Zapata   State Bank   100 %
International Bank of Commerce, Brownsville   State Bank   100 %
Gulfstar Group I, Ltd.   Investment and Merchant Banking   70 %
Gulfstar Group II, Ltd.   Investment Banking   70 %



QuickLinks

List of Subsidiaries