Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
SANCHEZ ANTONIO R JR
   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)
(Last)
(First)
(Middle)
P.O. BOX 2986		 3. Date of Earliest Transaction (Month/Day/Year)
03/04/2011
(Street)

LAREDO, TX 78044		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
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 03/04/2011   J(1)   225,000 D $ 0 1,779,184 I HELD IN PARTNERSHIP
COMMON STOCK 03/04/2011   S(2)   77,511 D $ 18.95 2,689,560 D  
COMMON STOCK 03/04/2011   S(2)   84,850 D $ 18.95 5,345,186 I HELD IN TRUST
COMMON STOCK 03/04/2011   S(2)   121,771 A $ 18.95 5,466,957 (5) I HELD IN TRUST
COMMON STOCK 03/07/2011   S(3)   130,000 D $ 18.39 1,649,184 I HELD IN PARTNERSHIP
COMMON STOCK 03/08/2011   S(4)   70,000 D $ 18.36 1,579,184 (5) I HELD IN PARTNERSHIP

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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 Underlying Securities
(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 of Derivative Security: 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

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
SANCHEZ ANTONIO R JR
P.O. BOX 2986
LAREDO, TX 78044		   X   X    

Signatures

 /S/ANTONIO R. SANCHEZ JR.   03/08/2011
**Signature of Reporting Person Date

Explanation of Responses:

* 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).
(1) On March 4, 2011, a total of 225,000 shares were distributed pro-rata from SANTIG, Ltd. to its limited partners. Of these shares, 84,850 shares were distributed to four trusts for which the reporting person is the sole trustee, 77,511 shares were distributed to the reporting person directly and 62,639 shares were distributed to other limited partners.
(2) On March 4, 2011, immediately following the pro-rata distribution described in footnote 1 above, in a private transaction, the reporting person transferred the 77,511 shares, and four trusts for which the reporting person is the sole trustee sold the 84,850 shares, each as described in footnote 1 above, to a fifth trust for which the reporting person is the sole trustee and to a foundation, in satisfaction of certain debt owed to the fifth trust and the foundation by the reporting person and the four trusts. In the transfer, the fifth trust received 121,771 shares and the foundation received 40,590 shares.
(3) This transaction was executed in multiple trades at prices ranging from $18.16 to $18.42. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
(4) This transaction was executed in multiple trades at prices ranging from $18.04 to $18.70. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
(5) The reporting person disclaims beneficial ownership of the reported securities except to the extent of pecuniary interests therein, if any.

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