Sec Form 4 Filing - CASTELLI MICHAEL J @ AMERICAN INTERNATIONAL GROUP INC - 2005-04-13

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 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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1. Name and Address of Reporting Person CASTELLI MICHAEL J 2. Issuer Name and Ticker or Trading Symbol AMERICAN INTERNATIONAL GROUP INC [ (AIG)] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Sr V.P. & Ch. Admin. Officer (Last) (First) (Middle) AMERICAN INTERNATIONAL GROUP, INC., 70 PINE STREET 3. Date of Earliest Transaction (MM/DD/YY) 04/13/2005 (Street) NEW YORK, NY10270 4. If Amendment, Date Original Filed (MM/DD/YY) 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 (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 04/13/2005 M 723 ( 1 ) A $ 22.1037 15,526 D Common Stock 04/13/2005 M 2,094 ( 2 ) A $ 25.9852 17,620 D Common Stock 04/13/2005 M 749 ( 3 ) A $ 37.8667 18,369 D Common Stock 04/13/2005 M 221 ( 4 ) A $ 46.5333 18,590 D Common Stock 04/13/2005 M 267 ( 5 ) A $ 47 18,857 D

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 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 Employee Stock Option (Right to Buy) $ 22.1037 04/13/2005 M 1,265 12/14/1999 12/14/2005 Common Stock 1,265 ( 6 ) 0 D Employee Stock Option (Right to Buy) $ 25.9852 04/13/2005 M 4,218 12/11/2000 12/11/2006 Common Stock 4,218 ( 6 ) 0 D Employee Stock Option (Right to Buy) $ 37.8667 04/13/2005 M 2,812 12/08/2001 12/08/2007 Common Stock 2,812 ( 6 ) 0 D Employee Stock Option (Right to Buy) $ 46.5333 04/13/2005 M 2,250 12/14/2002 12/14/2008 Common Stock 2,250 ( 6 ) 0 D Employee Stock Option (Right to Buy) $ 47 04/13/2005 M 3,000 02/10/2007 02/10/2013 Common Stock 3,000 ( 7 ) 3,000 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other CASTELLI MICHAEL J AMERICAN INTERNATIONAL GROUP, INC. 70 PINE STREET NEW YORK, NY10270 Sr V.P. & Ch. Admin. Officer Signatures /s/ Castelli, Michael J. 04/14/2005 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On April 13, 2005, Mr. Castelli exercised options for 1,265 shares using previously owned shares to pay for options granted pursuant to the AIG 1991 Employee Stock Option Plan. This acquisition reflects the number of options exercised less the 542 shares surrendered to purchase the option. ( 2 )On April 13, 2005, Mr. Castelli exercised options for 4,218 shares using previously owned shares to pay for options granted pursuant to the AIG 1991 Employee Stock Option Plan. This acquisition reflects the number of options exercised less the 2,124 shares surrendered to purchase the option. ( 3 )On April 13, 2005, Mr. Castelli exercised options for 2,812 shares using previously owned shares to pay for options granted pursuant to the AIG 1991 Employee Stock Option Plan. This acquisition reflects the number of options exercised less the 2,063 shares surrendered to purchase the option. ( 4 )On April 13, 2005, Mr. Castelli exercised options for 2,250 shares using previously owned shares to pay for options granted pursuant to the AIG 1991 Employee Stock Option Plan. This acquisition reflects the number of options exercised less the 2,029 shares surrendered to purchase the option. ( 5 )On April 13, 2005, Mr. Castelli exercised options for 3,000 shares using previously owned shares to pay for options granted pursuant to the AIG 1999 Employee Stock Option Plan. This acquisition reflects the number of options exercised less the 2,733 shares surrendered to purchase the option. ( 6 )These options were granted under AIG's 1991 Employee Stock Option Plan. Pursuant to the terms of the plan, 25% of the option becomes exercisable on the anniversary date of the grant in each of the four years following the grant. ( 7 )These options were granted under AIG's 1999 Stock Option Plan. Pursuant to the terms of the plan, 25% of the option becomes exercisable on the anniversary date of the grant in each of the four years following the grant.

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