As Filed Pursuant to Rule 424(b)(3)

Registration No. 333-135880

(AIG LOGO)

American International Group, Inc.

Offer to Exchange

$500,000,000 4.700% Notes Due 2010; and

$1,000,000,000 5.050% Notes Due 2015

For Any and All Outstanding

4.700% Notes Due 2010; and

5.050% Notes Due 2015

THIS EXCHANGE OFFER WILL EXPIRE AT 5:00 P.M.,

NEW YORK CITY TIME, ON AUGUST 23, 2006, UNLESS

EXTENDED BY US

          The terms of the new notes are substantially identical to the terms of the old notes, except that the new notes are registered under the Securities Act of 1933 (the “Securities Act”) and the transfer restrictions and registration rights and related additional interest provisions currently applicable to the old notes do not apply to the new notes.

          The old notes were and the new notes will be admitted to the Official List and traded on the regulated market of the Irish Stock Exchange. An EU Prospectus (as defined on page 1), dated September 29, 2005, has been approved by the Irish Financial Services Regulatory Authority (the “Financial Regulator”), as competent authority under Directive 2003/71/EC. See “Listing of the Notes on the Irish Stock Exchange” on page 1 for more information.

            See “Risk Factors” on page 5 for a discussion of factors you should consider before tendering your old notes for new notes.

          Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities, or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

The date of this prospectus is July 25, 2006

TABLE OF CONTENTS

      Unless otherwise mentioned or unless the context requires otherwise, all references in this prospectus to the “Company”, “AIG”, “we”, “our”, “us” and similar references mean American International Group, Inc. and its subsidiaries.

      You should rely only on the information contained in this prospectus or information contained in documents incorporated by reference in this prospectus. We have not authorized anyone to provide you with different information. This prospectus is an offer to exchange only the notes offered by this prospectus and only under circumstances and in jurisdictions where it is lawful to do so. The information contained in this prospectus is accurate only as of its date.

CAUTIONARY STATEMENT REGARDING PROJECTIONS

AND OTHER INFORMATION ABOUT FUTURE EVENTS

      This prospectus and the documents incorporated herein by reference, as well as other publicly available documents, may include, and AIG’s officers and representatives may from time to time make, projections concerning financial information and statements concerning future economic performance and events, plans and objectives relating to management, operations, products and services, and assumptions underlying these projections and statements. These projections and statements are not historical facts but instead represent only AIG’s belief regarding future events, many of which, by their nature, are inherently uncertain and outside AIG’s control. These projections and statements may address, among other things, the status and potential future outcome of the current regulatory and civil proceedings against AIG and their potential effect on AIG’s businesses, financial position, results of operations, cash flows and liquidity, the effect of the credit rating downgrades on AIG’s businesses and competitive position, the unwinding and resolving of various relationships between AIG and C.V. Starr & Co., Inc. and Starr International Company, Inc. and AIG’s strategy for growth, product development, market position, financial results and reserves. It is possible that AIG’s actual results and financial condition may differ, possibly materially, from the anticipated results and financial condition indicated in these projections and statements. Factors that could cause AIG’s actual results to differ, possibly materially, from those in the specific projections and statements are discussed throughout Management’s Discussion and Analysis of Financial Condition and Results of Operations in Item 7, Part II of AIG’s Annual Report on Form 10-K/A for the fiscal year ended December 31, 2005 and “Risk Factors” in Item 1A, Part I of AIG’s Annual Report on Form 10-K for the fiscal year ended December 31, 2005 and in AIG’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2006. AIG is not under any obligation (and expressly disclaims any such obligations) to update or alter any projection or other statement, whether written or oral, that may be made from time to time, whether as a result of new information, future events or otherwise.

WHERE YOU CAN FIND MORE INFORMATION

      AIG is required to file annual, quarterly and current reports, proxy statements and other information with the Securities and Exchange Commission (SEC). These reports, proxy statements and other information can be inspected and copied at:

      Please call the SEC at 1-800-SEC-0330 for further information on the public reference room. AIG’s filings are also available to the public through:

      AIG’s common stock is listed on the NYSE and trades under the symbol “AIG”.

      AIG has filed with the SEC a registration statement on Form S-4 relating to the notes. This prospectus is part of the registration statement and does not contain all the information in the registration statement. Whenever a reference is made in this prospectus to a contract or other document, please be aware that the reference is not necessarily complete and that you should refer to the exhibits that are part of the registration statement for a copy of the contract or other document. You may review a copy of the registration statement at the SEC’s public reference room in Washington, D.C. as well as through the SEC’s internet site noted above.

      The SEC allows AIG to “incorporate by reference” the information AIG files with the SEC, which means that AIG can disclose important information to you by referring to those documents. The information incorporated by reference in this prospectus is considered to be part of this prospectus. Any reports filed by AIG with the SEC after the date of this prospectus and until the exchange offer is completed will automatically update, and where applicable, supersede any information contained in this prospectus or incorporated by reference in this prospectus. AIG incorporates by reference into this prospectus the documents listed below, any filings made with the SEC under Section 13(a), 13(c), 14, or 15(d) of the Securities Exchange Act of 1934 after the time of initial filing of the registration statement (or post-effective amendment) and before effectiveness of the registration statement (or post-effective amendment), and after the date of this prospectus and until the exchange offer is completed.

      AIG will provide without charge to each person, including any beneficial owner, to whom this prospectus is delivered, upon his or her written or oral request, a copy of any or all of the reports or documents referred to above that have been incorporated by reference into this prospectus excluding exhibits to those documents unless they are specifically incorporated by reference into those documents. You can request those documents from AIG’s Director of Investor Relations, 70 Pine Street, New York, New York 10270, telephone 212-770-6293, or you may obtain them from AIG’s corporate website at www.aigcorporate.com. Except for the documents specifically incorporated by reference into this prospectus, information contained on AIG’s website or that can be accessed through its website does not constitute a part of this prospectus. AIG has included its website address only as an inactive textual reference and does not intend it to be an active link to its website.

      In order to ensure timely delivery of the requested documents, requests should be made no later than August 16, 2006 . In the event that we extend the exchange offer, you must submit your request at least five business days before the expiration date, as extended.

LISTING OF THE NOTES ON THE IRISH STOCK EXCHANGE

      The old notes were and the new notes will be admitted to the Official List and traded on the regulated market of the Irish Stock Exchange. AIG prepared a prospectus pursuant to Article 5.3 of the Prospectus Directive (the “EU Prospectus”), dated September 29, 2005, for the purpose of seeking such admission. Copies of the EU Prospectus may be obtained from the Irish Stock Exchange.

      The European Union Transparency Obligations Directive (the “Directive”) may be implemented in a manner which could be unduly burdensome for U.S. companies, such as AIG. In particular, AIG may be required to prepare its financial statements in accordance with International Financial Reporting Standards. AIG will use all reasonable endeavours to maintain the listing of the notes, and Noteholders should be aware that, in circumstances where a listing on the Irish Stock Exchange would require preparation of financial statements in accordance with standards other than U.S. GAAP, or in any other circumstances where the Directive is implemented in a manner that, in the opinion of AIG, and as agreed by the Trustee, is unduly burdensome, the notes may be de-listed. In such cases, AIG may, but will not be obliged to, seek an alternative listing for the notes on a stock exchange outside the European Union. However, if such an alternative listing is not available to AIG or is, in the opinion of AIG, unduly burdensome, an alternative listing for the notes may not be obtained. Although no assurance is made as to the liquidity of the notes as a result of their listing on the Irish Stock Exchange, delisting the notes from the Irish Stock Exchange may have a material effect on the ability of noteholders to resell the notes in the secondary market.

PROSPECTUS SUMMARY

      The following summary highlights selected information from this prospectus and does not contain all of the information that you should consider before participating in this exchange offer. You should read the entire prospectus, the accompanying letter of transmittal and documents incorporated by reference carefully.

American International Group, Inc.

      AIG, a Delaware corporation, is a holding company which, through its subsidiaries, is engaged in a broad range of insurance and insurance-related activities in the United States and abroad. AIG’s principal executive offices are located at 70 Pine Street, New York, New York 10270, and its telephone number is 212-770-7000. The Internet address for AIG’s corporate website is www.aigcorporate.com. Except for the documents referred to under “Where You Can Find More Information” which are specifically incorporated by reference into this prospectus, information contained on AIG’s website or that can be accessed through its website does not constitute a part of this prospectus. AIG has included its website address only as an inactive textual reference and does not intend it to be an active link to its website.

The Exchange Offer

The New Notes

RISK FACTORS

      Before tendering old notes in the exchange offer, you should consider carefully each of the following risks and all other information contained in this prospectus. See “Risk Factors” in AIG’s Annual Report on Form 10-K for the fiscal year ended December 31, 2005 and Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2006 for a discussion of additional risk factors related to AIG.

If you fail to exchange the old notes, they will remain subject to transfer restrictions

      Any old notes that remain outstanding after this exchange offer will continue to be subject to restrictions on their transfer. After this exchange offer, holders of old notes will not have any further rights to have their old notes exchanged for new notes or registered under the Securities Act. The liquidity of the market for old notes that are not exchanged could be adversely affected by this exchange offer and you may be unable to sell your old notes.

Late deliveries of old notes and other required documents could prevent a holder from exchanging its old notes

      Noteholders are responsible for complying with all exchange offer procedures. The issuance of new notes in exchange for old notes will only occur upon completion of the procedures described in this prospectus under “The Exchange Offer.” Therefore, holders of old notes who wish to exchange them for new notes should allow sufficient time for timely completion of the exchange procedure. Neither we nor the exchange agent are obligated to extend the offer or notify you of any failure to follow the proper procedure.

If you are a broker-dealer, your ability to transfer the new notes may be restricted

      A broker-dealer that purchased old notes for its own account as part of market-making or trading activities must deliver a prospectus when it sells the new notes. Our obligation to make this prospectus available to broker-dealers is limited. Consequently, we cannot guarantee that a proper prospectus will be available to broker-dealers wishing to resell their new notes.

There has not been, and there may not be, a public market for the new notes

      The new notes are a new issuance of securities. There can be no assurance as to the development of any market or the liquidity of any market that may develop for the new notes. The liquidity of, and trading markets for, the new notes may also be adversely affected by general economic conditions and by our financial performance.

USE OF PROCEEDS

      We will not receive any proceeds from the exchange offer. In consideration for issuing the new notes, we will receive old notes from you in the same principal amount. The old notes surrendered in exchange for the new notes will be retired and canceled and cannot be reissued. Accordingly, issuance of the new notes will not result in any change in our indebtedness.

CONSOLIDATED RATIO OF EARNINGS TO FIXED CHARGES

      The following table sets forth the historical ratios of earnings to fixed charges of AIG and its consolidated subsidiaries for the periods indicated. For more information on our consolidated ratios of earnings to fixed charges, see our Annual Report on Form 10-K for the fiscal year ended December 31, 2005 and our Quarterly

Report on Form 10-Q for the quarterly period ended March 31, 2006, both of which are incorporated by reference into this prospectus as described under “Where You Can Find More Information.”

Earnings represent:

plus

less

Fixed charges include:

As of the date of this prospectus, we have no preferred stock outstanding.

THE EXCHANGE OFFER

      The following summary of the exchange and registration rights agreement and letter of transmittal is not complete and is subject to, and is qualified in its entirety by, all of the provisions of the exchange and registration rights agreement and the letter of transmittal, each of which is filed as an exhibit to the registration statement of which this prospectus is part.

Purpose and Effect of Exchange Offer; Registration Rights

      We are offering to exchange our 4.700% Notes Due 2010 and 5.050% Notes Due 2015, which have been registered under the Securities Act and which we refer to as the new notes, for our outstanding 4.700% Notes Due 2010 and 5.050% Notes Due 2015, which have not been so registered and which we refer to as the old notes. We refer to this exchange offer as the exchange offer.

      The old notes were purchased by Citigroup Global Markets Inc. and Lehman Brothers Inc., whom we refer to as the initial purchasers, on September 30, 2005 for resale to qualified institutional buyers in compliance with Rule 144A under the Securities Act and outside of the United States in compliance with Regulation S under the Securities Act. In connection with the sale of the old notes, we and the initial purchasers entered into an exchange and registration rights agreement, dated September 30, 2005, which requires us, among other things,

      We are obligated, upon the effectiveness of the exchange offer registration statement referred to above, to offer the holders of the old notes the opportunity to exchange their old notes for a like principal amount of new notes which will be issued without a restrictive legend and may be reoffered and resold by the holder generally without restrictions or limitations under the Securities Act. The exchange offer is being made pursuant to the exchange and registration rights agreement to satisfy our obligations under that agreement.

      The old notes and the exchange and registration rights agreement provide, among other things, that if we default in our obligations to take certain steps to make the exchange offer within the time periods specified in the notes and the registration rights agreement, the interest rate on the old notes will initially increase by .125% and after 90 days (if the default continues) by .25%, the maximum additional annual interest rate, until the default is remedied.

      Under the terms of the old notes and the registration rights agreement, additional interest accrues on the old notes until the exchange offer is completed. However, once the exchange offer is completed, no additional interest will accrue on any old note.

Terms of the Exchange Offer

      For each of the old notes properly surrendered and not withdrawn before the expiration date of the exchange offer, a new note having a principal amount equal to that of the surrendered old note will be issued.

      The form and terms of the new notes will be the same as the form and terms of the old notes of that series except that:

      You may tender old notes only in minimum denominations of $100,000 and integral multiples of $1,000 in excess thereof; provided, however, that a note in a principal amount of less than $200,000 may not be tendered in part.

      The new notes will evidence the same indebtedness as the old notes they replace, and will be issued under, and be entitled to the benefits of, the same indenture that authorized the issuance of the old notes. As a result, each series of old notes and the respective replacement new notes will be treated as a single series of notes under the indenture.

      No interest will be paid in connection with the exchange. The new notes will bear interest from and including the last interest payment date on which interest has been paid on the old notes. Accordingly, the holders of old notes that are accepted for exchange will not receive accrued but unpaid interest on old notes at the time of tender. Rather, that interest will be payable on the new notes delivered in exchange for the old notes on the first interest payment date after the expiration date.

      We intend to conduct the exchange offer in accordance with the provisions of the exchange and registration rights agreement and the applicable requirements of the Securities Exchange Act of 1934 and the related rules and regulations of the SEC thereunder.

      Under existing SEC interpretations, the new notes would generally be freely transferable after the exchange offer without further registration under the Securities Act, except that broker-dealers receiving the new notes in the exchange offer will be subject to a prospectus delivery requirement with respect to their resale. This view is based on interpretations by the staff of the SEC in no-action letters issued to other issuers in exchange offers like this one. We have not, however, asked the SEC to consider this particular exchange offer in the context of a no-action letter. Therefore, the SEC might not treat it in the same way it has treated other exchange offers in the past. You will be relying on the no-action letters that the SEC has issued to third

parties in circumstances that we believe are similar to ours. Based on these no-action letters, the following conditions must be met:

      If you wish to exchange old notes for new notes in the exchange offer you must represent to us that you satisfy all of the above listed conditions. If you do not satisfy all of the above listed conditions:

      The SEC considers broker-dealers that acquired old notes directly from us, but not as a result of market-making activities or other trading activities, to be making a distribution of the new notes if they participate in the exchange offer. Consequently, these broker-dealers must comply with the registration and prospectus delivery requirements of the Securities Act in connection with a resale of the new notes.

      A broker-dealer that has bought old notes for market-making or other trading activities must deliver a prospectus in order to resell any new notes it receives for its own account in the exchange offer. The SEC has taken the position that broker-dealers may fulfill their prospectus delivery requirements with respect to the new notes by delivering the prospectus contained in the registration statement for the exchange offer. This prospectus may be used by a broker-dealer to resell any of its new notes. We have agreed in the exchange and registration rights agreement to send a prospectus to any broker-dealer that requests copies in the notice and questionnaire included in the letter of transmittal accompanying the prospectus for a period of up to 30 days after the date of expiration of this exchange offer.

      Unless you are required to do so because you are a broker-dealer, you may not use this prospectus for an offer to resell, resale or other retransfer of new notes. We are not making this exchange offer to, nor will we accept tenders for exchange from, holders of old notes in any jurisdiction in which the exchange offer or the acceptance of it would not be in compliance with the securities or blue sky laws of that jurisdiction.

Expiration Date; Extensions; Amendments

      The expiration date for the exchange offer is 5:00 p.m., New York City time, on August 23, 2006. We may extend this expiration date in our sole discretion. If we so extend the expiration date, the term “expiration date” shall mean the latest date and time to which we extend the exchange offer.

      We reserve the right, in our sole discretion:

      We will give oral or written notice of any delay, extension or termination to the exchange agent. In addition, we will give, as promptly as practicable, oral or written notice regarding any delay in acceptance, extension or termination of the offer to the registered holders of old notes. If we amend the exchange offer in a manner that we determine to constitute a material change, or if we waive a material condition, we will

promptly disclose the amendment or waiver in a manner reasonably calculated to inform the holders of old notes of the amendment or waiver, and extend the offer if required by law.

      We intend to make public announcements of any delay in acceptance, extension, termination, amendment or waiver regarding the exchange offer through a timely release to a financial news service.

Conditions to the Exchange Offer

      We will not be required to accept for exchange, or exchange new notes for, any old notes, and we may terminate the exchange offer as provided in this prospectus before the acceptance of the old notes, if:

      The conditions listed above are for our sole benefit and we may assert them regardless of the circumstances giving rise to any of these conditions. We may waive these conditions in our sole discretion in whole or in part at any time and from time to time. A failure on our part to exercise any of the above rights shall not constitute a waiver of that right, and that right shall be considered an ongoing right which we may assert at any time and from time to time.

      If we determine in our sole discretion that any of the events listed above has occurred, we may, subject to applicable law:

      Any determination by us concerning the above events will be final and binding.

      In addition, we reserve the right in our sole discretion to:

      The terms of any such purchases or offers may differ from the terms of the exchange offer.

Procedures For Tendering

      Except in limited circumstances, only a DTC participant listed on a DTC securities position listing with respect to the old notes may tender old notes in the exchange offer. To tender old notes in the exchange offer:

      By tendering, you will make the representations described below under “— Representations on Tendering Old Notes.” In addition, each participating broker-dealer must acknowledge that it will deliver a prospectus in connection with any resale of the new notes. See “Plan of Distribution.” The tender by a holder of old notes will constitute an agreement between that holder and us in accordance with the terms and subject to the conditions set forth in this prospectus and in the letter of transmittal.

      The method of delivery of old notes, the letter of transmittal and all other required documents or transmission of an agent’s message, as described under “— Book-Entry Transfer,” to the exchange agent is at the election and risk of the tendering holder of old notes. Instead of delivery by mail, we recommend that holders use an overnight or hand delivery service. In all cases, sufficient time should be allowed to assure timely delivery to the exchange agent prior to the expiration of the exchange offer. No letter of transmittal or old notes should be sent to us or DTC. Delivery of documents to DTC in accordance with its procedures does not constitute delivery to the exchange agent.

      Signatures on a letter of transmittal or a notice of withdrawal, as described in “— Withdrawal of Tenders” below, must be guaranteed by a member of the New York Stock Exchange Medallion Signature Program or an “eligible guarantor institution,” within the meaning of Rule 17Ad-15 under the Exchange Act, which we refer to together as eligible institutions, unless the old notes are tendered for the account of an eligible institution.

      We will determine in our sole discretion all questions as to the validity, form, eligibility, including time of receipt, and acceptance and withdrawal of tendered old notes. We reserve the absolute right to reject any and all old notes not properly tendered or any old notes whose acceptance by us would, in the opinion of our counsel, be unlawful. We also reserve the right to waive any defects, irregularities or conditions of tender as to any particular old notes either before or after the expiration date. Our interpretation of the terms and conditions of the exchange offer, including the instructions in the letter of transmittal, will be final and binding on all parties. Unless waived, holders must cure any defects or irregularities in connection with tenders of old notes within a period we determine. Although we intend to request the exchange agent to notify holders of defects or irregularities relating to tenders of old notes, neither we, the exchange agent nor any other person will have any duty or incur any liability for failure to give this notification. We will not consider tenders of old notes to have been made until these defects or irregularities have been cured or waived. The exchange agent will return any old notes that are not properly tendered and as to which the defects or irregularities have not been cured or waived to the tendering holders, unless otherwise provided in the letter of transmittal, as soon as practicable following the expiration date.

Book-Entry Transfer

      We understand that the exchange agent will make a request promptly after the date of this prospectus to establish accounts with respect to the old notes at DTC for the purpose of facilitating the exchange offer. Any financial institution that is a participant in DTC’s system may make book-entry delivery of old notes by causing DTC to transfer such old notes into the exchange agent’s DTC account in accordance with DTC’s

electronic Automated Tender Offer Program procedures for such transfer. The exchange of new notes for tendered old notes will only be made after timely:

      The confirmation, letter of transmittal or agent’s message and any other required documents must be received at the exchange agent’s address listed below under “— Exchange Agent” on or before 5:00 p.m., New York time, on the expiration date of the exchange offer, or, if the guaranteed delivery procedures described below are complied with, within the time period provided under those procedures.

      As indicated above, delivery of documents to DTC in accordance with its procedures does not constitute delivery to the exchange agent.

      The term “agent’s message” means a message, transmitted by DTC and received by the exchange agent and forming part of the confirmation of a book-entry transfer, which states that DTC has received an express acknowledgment from a participant in DTC tendering old notes stating:

      Delivery of an agent’s message will also constitute an acknowledgment from the tendering DTC participant that the representations contained in the letter of transmittal and described below under “Representations on Tendering Old Notes” are true and correct.

Guaranteed Delivery Procedures

      The following guaranteed delivery procedures are intended for holders who wish to tender their old notes but:

      The conditions that must be met to tender old notes through the guaranteed delivery procedures are as follows:

      Upon request to the exchange agent, a notice of guaranteed delivery will be sent to holders who wish to tender their old notes according to the guaranteed delivery procedures set forth above.

Representations on Tendering Old Notes

      By surrendering old notes in the exchange offer, you will be representing that, among other things:

      If you are a broker-dealer and you will receive new notes for your own account in exchange for old notes that were acquired as a result of market-making activities or other trading activities, you will be required to acknowledge in the letter of transmittal that you will deliver a prospectus in connection with any resale of the new notes. The letter of transmittal states that, by delivering a prospectus, a broker-dealer will not be deemed to be an “underwriter” within the meaning of the Securities Act. See also “Plan of Distribution.”

Withdrawal of Tenders

      Your tender of old notes pursuant to the exchange offer is irrevocable except as otherwise provided in this section. You may withdraw tenders of old notes at any time prior to 5:00 p.m., New York time, on the expiration date.

      For a withdrawal to be effective for DTC participants, holders must comply with their respective standard operating procedures for electronic tenders and the exchange agent must receive an electronic notice of withdrawal from DTC.

      Any notice of withdrawal must specify the name and number of the account at DTC to be credited with the withdrawn old notes and otherwise comply with the procedures of DTC. We will determine in our sole discretion all questions as to the validity, form and eligibility, including time of receipt, for such withdrawal notices, and our determination shall be final and binding on all parties. Any old notes so withdrawn will be deemed not to have been validly tendered for purposes of the exchange offer and no new notes will be issued with respect to them unless the old notes so withdrawn are validly retendered. Any old notes which have been tendered but which are not accepted for exchange will be returned to the holder without cost to such holder as soon as practicable after withdrawal, rejection of tender or termination of the exchange offer. Properly withdrawn old notes may be re-tendered by following the procedures described above under “— Procedures For Tendering” at any time prior to the expiration date.

Exchange Agent

      We have appointed The Bank of New York as exchange agent in connection with the exchange offer. Holders should direct questions, requests for assistance and for additional copies of this prospectus, the letter of transmittal or notices of guaranteed delivery to the exchange agent addressed as follows:

      Delivery of a letter of transmittal to any address or facsimile number other than the one set forth above will not constitute a valid delivery.

Fees and Expenses

      We will not make any payments to brokers, dealers or other persons soliciting acceptances of the exchange offer. We will, however, pay the exchange agent reasonable and customary fees for its services and will reimburse it for its related reasonable out-of-pocket expenses. We may also pay brokerage houses and other custodians, nominees and fiduciaries the reasonable out-of-pocket expenses incurred by them in forwarding copies of this prospectus, letters of transmittal and related documents to the beneficial owners of the old notes and in handling or forwarding tenders for exchange.

      Holders who tender their old notes for exchange will not be obligated to pay any transfer taxes. If, however, a transfer tax is imposed for any reason other than the exchange of old notes in connection with the exchange offer, then the tendering holder must pay the amount of any transfer taxes due, whether imposed on the registered holder or any other persons. If the tendering holder does not submit satisfactory evidence of payment of these taxes or exemption from them with the letter of transmittal, the amount of these transfer taxes will be billed directly to the tendering holder.

Consequences of Failure to Properly Tender Old Notes in the Exchange

      We will issue the new notes in exchange for old notes under the exchange offer only after timely receipt by the exchange agent of the old notes, a properly completed and duly executed letter of transmittal and all other required documents. Therefore, holders of the old notes desiring to tender old notes in exchange for new notes should allow sufficient time to ensure timely delivery. We are under no duty to give notification of defects or irregularities of tenders of old notes for exchange. Old notes that are not tendered or that are tendered but not accepted by us will, following completion of the exchange offer, continue to be subject to the existing restrictions upon transfer under the Securities Act.

      Participation in the exchange offer is voluntary. In the event the exchange offer is completed, we will not be required to register the remaining old notes. Remaining old notes will continue to be subject to the following restrictions on transfer:

      To the extent that old notes are tendered and accepted in connection with the exchange offer, any trading market for remaining old notes could be adversely affected.

DESCRIPTION OF THE NEW NOTES

General

      The old notes were and the new notes will be issued under an indenture, dated as of July 15, 1989, between us and The Bank of New York, as trustee, as supplemented by the First Supplemental Indenture on May 15, 2003 and by the Second Supplemental Indenture on September 30, 2005. The following summary of certain provisions of the new notes and the indenture does not purport to be complete and is subject, and qualified in its entirety by reference to, all of the provisions of the notes and the indenture, including the definitions of terms therein. See “Where You Can Find More Information” for information on how to obtain a copy of the indenture.

      The old notes were and the new notes will be issued in fully registered form in a minimum denomination of $100,000 and integral multiples of $1,000 in excess thereof and will be represented by global notes (as defined below) registered in the name of DTC, as described in “— Book-Entry System” below.

      The notes will be unsecured senior obligations of AIG and will rank equally with all of our other unsecured senior indebtedness.

      The old notes were and the new notes will be issued in two separate series, which we refer to as the 5 year notes and the 10 year notes. The new 5 year notes and the new 10 year notes will be identical in all material respects to the old 5 year notes and the old 10 year notes, respectively, except that the registration rights and the related additional interest provisions and transfer restrictions applicable to the old notes do not apply to the new notes. The new 5 year notes and the old 5 year notes and the new 10 year notes and the old 10 year notes will each constitute a single series for all purposes under the indenture. To the extent any old notes are not exchanged for new notes, those old notes will remain outstanding under the indenture and will rank pari passu with the new notes of that series. We refer to the old notes and the new notes of each series collectively as the 5 year notes and the 10 year notes.

Principal, Maturity and Interest

      The new 5 year notes will be issued in an aggregate principal amount of up to $500,000,000 and the new 10 year notes will be issued in an aggregate principal amount of up to $1,000,000,000. We may, without the consent of the holders of the notes, increase the principal amount of such notes in the future on the same terms and conditions (except that the issue price and issue date may vary) and with the same CUSIP numbers, ISIN and common code as notes of that series being offered by this prospectus.

      The new 5 year notes will bear interest at 4.700% per annum and will mature on October 1, 2010. The new 10 year notes will bear interest at 5.050% per annum and will mature on October 1, 2015. Interest on the new 5 year notes and the new 10 year notes will be payable on the notes semiannually in arrears on April 1 and October 1 of each year to holders of record on the immediately preceding March 15 and September 15. Interest on the new notes will be computed on the basis of a 360-day year comprised of twelve 30-day months. On the maturity date of the new notes, holders will be entitled to receive 100% of the principal amount of the new notes plus accrued and unpaid interest, if any. The new notes do not provide for any sinking fund.

      For so long as the new notes are issued in book-entry form, payments of principal and interest will be made in immediately available funds by wire transfer to DTC or its nominee. We may issue definitive notes in the limited circumstances set forth in “— Book-Entry System” below.

Optional Redemption

      We will have the right to redeem each series of the notes, in whole or in part, at any time, at a redemption price equal to the greater of

plus, in each case, accrued interest thereon to the date of redemption.

      The definitions of certain terms used in the paragraph above are listed below.

      Adjusted treasury rate means, with respect to any redemption date, the rate per annum equal to the semiannual equivalent yield to maturity of the comparable treasury issue, assuming a price for the comparable treasury issue (expressed as a percentage of its principal amount) equal to the comparable treasury price for such redemption date.

      Comparable treasury issue means the U.S. Treasury security selected by the quotation agent as having a maturity comparable to the remaining term of the notes to be redeemed that would be utilized, at the time of selection and in accordance with customary financial practice, in pricing new issues of corporate debt securities of comparable maturity to the remaining term of such notes.

      Comparable treasury price means, with respect to any redemption date, the average of the reference treasury dealer quotations for such redemption date.

      Quotation agent means AIG Financial Products Corp.

      Reference treasury dealer means

      Reference treasury dealer quotations means with respect to each reference treasury dealer and any redemption date, the average, as determined by the quotation agent, of the bid and asked prices for the comparable treasury issue (expressed in each case as a percentage of its principal amount) quoted in writing to the quotation agent by such reference treasury dealer at 5:00 p.m. on the third business day preceding such redemption date.

      If less than all of a series of notes is to be redeemed at any time, selection of notes for redemption will be made by the trustee on a pro rata basis, by lot or by such method as the trustee deems fair and appropriate; provided that notes with a principal amount of less than $101,000 will not be redeemed in part.

      We will give to DTC a notice of redemption at least 30 but not more than 60 days before the redemption date. If any notes are to be redeemed in part only, the notice of redemption that relates to such notes will state the portion of the principal amount thereof to be redeemed. A new note in principal amount equal to the unredeemed portion thereof will be issued in the name of the holder thereof upon cancellation of the original note.

      Unless we default in payment of the redemption price, on and after the redemption date, interest will cease to accrue on the notes or portions thereof called for redemption.

Special Situations

      We are generally permitted to consolidate or merge with another company or firm. We are also permitted to sell or lease substantially all of our assets to another firm, or to buy or lease substantially all of the assets of another firm. However, we may not take any of these actions unless all the following conditions are met:

      If the conditions described above are satisfied with respect to the notes, we will not need to obtain the approval of the holders of the notes in order to merge or consolidate or to sell our assets. Also, these conditions will apply only if we wish to merge or consolidate with another entity or sell our assets substantially as an entirety to another entity. We will not need to satisfy these conditions if we enter into other types of transactions, including any transaction in which we acquire the stock or assets of another entity, any transaction that involves a change of control but in which we do not merge or consolidate and any transaction in which we sell less than substantially all of our assets.

Modification and Waiver of the Notes

      There are three types of changes we can make to the indenture and the notes.

      First, the following modifications would require the consent of the holder of each note affected thereby:

      The second type of change to the indenture and the notes is the kind that requires a vote in favor by holders of notes owning 66²/3 % of the principal amount of that series. Most changes fall into this category, except for clarifying changes and certain other changes that would not adversely affect holders of the notes. The same vote would be required for us to obtain a waiver of all or part of the restrictive covenant described below. We may obtain a waiver of a past default from the holders of notes owning a majority of the principal amount of the series affected. However, we cannot obtain a waiver of a payment default or any other aspect of the indenture or the notes listed in the first category described above under “—Changes Requiring Approval of All Holders” unless we obtain the individual consent of each holder to the waiver.

      The third type of change does not require any vote by holders of notes. This type is limited to clarifications and certain other changes that would not adversely affect holders of the notes.

      The notes will not be considered outstanding, and therefore will not be eligible to vote, if we have deposited or set aside in trust for you money for their payment or redemption. The notes will also not be eligible to vote if they have been fully defeased as described below under “Defeasance — Full Defeasance.”

      We will generally be entitled to set any day as a record date for the purpose of determining the holders of outstanding notes that are entitled to vote or take other action under the indenture. In limited circumstances, the trustee will be entitled to set a record date for action by holders. If we or the trustee set a record date for a vote or other action to be taken by holders of a particular series, that vote or action may be taken only by persons who are holders of outstanding notes of that series on the record date and must be taken within 90 days following the record date.

Restrictive Covenant

      Some of the voting stock of certain of our designated subsidiaries may be subject to a mortgage or other legal mechanism that gives lenders preferential rights in that voting stock of our designated subsidiaries over the holders of the notes if they are not paid back. These preferential rights are called liens. We promise that neither we nor our designated subsidiaries will become obligated on any new debt for borrowed money that is secured by a lien on any shares of voting stock of any of our designated subsidiaries, unless the holders of the notes (and, if we elect, any other holders of debt issued by AIG) are granted an equivalent or higher-ranking lien on the same property.

      Following are the meanings of the terms that are important in understanding the restrictive covenant previously described.

      Designated subsidiary means American Home Assurance Company, National Union Fire Insurance Company of Pittsburgh, Pa., and any subsidiary the assets of which, determined as of the last day of the most recent calendar quarter ended at least 30 days prior to the date of determination and in accordance with generally accepted accounting principles as in effect on the last day of that calendar quarter, exceed 20% of our consolidated assets.

      Subsidiary means a corporation, partnership or trust in which we and/or one or more of our other subsidiaries own at least 50% of the voting stock, which is a kind of stock that ordinarily permits its owners to vote for election of directors.

      Our consolidated assets mean our assets and the assets of our consolidated subsidiaries, to be determined as of the last day of the most recent calendar quarter ended at least 30 days prior to the date of the determination and in accordance with generally accepted accounting principles as in effect on the last day of that calendar quarter.

      Except as noted above, the indenture does not restrict our ability to put liens on our interests in subsidiaries other than certain of our designated subsidiaries, nor does the indenture restrict our ability to sell or otherwise dispose of our interests in any of our subsidiaries. In addition, the restriction on liens in the indenture applies only to liens that secure debt for borrowed money. For example, liens imposed by operation of law, such as liens to secure statutory obligations for taxes or workers’ compensation benefits, or liens we create to secure obligations to pay legal judgments or surety bonds, would not be covered by this restriction.

Defeasance

      If there is a change in U.S. federal tax law, as described below, we can legally release ourselves from any payment or other obligations on the notes of either series, called full defeasance, if we put in place the following other arrangements for holders to be repaid:

      If we ever did accomplish full defeasance, as described above, you would have to rely solely on the trust deposit for repayment on the notes. You could not look to us for repayment in the unlikely event of any shortfall.

      Under current U.S. federal tax law, we can make the same type of deposit as described above and we will be released from the restrictive covenants under the notes of either series. This is called covenant defeasance. In that event, you would lose the protection of these restrictive covenants but would gain the protection of having money and securities set aside in trust to repay the notes of that series. In order to achieve covenant defeasance, we must do the following:

      If we accomplish covenant defeasance in respect of a series of notes, the following provisions of the indenture and the notes of that series would no longer apply:

      If we accomplish covenant defeasance in respect of a series of notes, you can still look to us for repayment of the notes of that series if there were a shortfall in the trust deposit. In fact, if one of the remaining events of default occurred (such as a bankruptcy) and the notes become immediately due and payable, there may be such a shortfall.

Events of Default

      You will have special rights if an event of default occurs and is not cured, as described later in this subsection.

      The term “Event of Default” means, in respect of each series of notes, any of the following:

      If an event of default occurs, the trustee will have special duties. In that situation, the trustee will be obligated to use those of its rights and powers under the indenture, and to use the same degree of care and skill in doing so, that a prudent person would use in that situation in conducting his or her own affairs. If an event of default has occurred and has not been cured with respect to notes of a series, the trustee or the holders of at least 25% in principal amount of the notes of that series may declare the entire principal amount of all the notes of that series to be due and immediately payable. This is called a declaration of acceleration of maturity. However, a declaration of acceleration of maturity may be cancelled, but only before a judgment or decree based on the acceleration has been obtained, by the holders of at least a majority in principal amount of the notes of that series.

      Except in cases of default, where the trustee has the special duties described above, the trustee is not required to take any action under the indenture at the request of any holders unless the holders offer the trustee reasonable protection from expenses and liability called an indemnity. If reasonable indemnity is provided, the holders of a majority in principal amount of the outstanding notes of the relevant series may direct the time, method and place of conducting any lawsuit or other formal legal action seeking any remedy

available to the trustee. These majority holders may also direct the trustee in performing any other action under the indenture with respect to the notes of that series.

      Before you bypass the trustee and bring your own lawsuit or other formal legal action or take other steps to enforce your rights or protect your interests relating to the notes the following must occur:

      However, you are entitled at any time to bring a lawsuit for the payment of money due on your note on or after its due date.

      We will give to the trustee every year a written statement of certain of our officers certifying that to their knowledge we are in compliance with the indenture and the notes, or else specifying any default.

Concerning the Trustee

      The Bank of New York from time to time provides normal banking services to us and our subsidiaries.

Governing Law

      The indenture and the notes will be governed by, and construed in accordance with, the laws of the State of New York.

Book-Entry System

      We will issue the new notes in book-entry form. This means that each of the new five-year notes and the new ten-year notes will be represented by one or more global notes deposited on behalf of DTC as “depositary” for the notes, and registered in the name of Cede & Co. as DTC’s nominee. DTC will hold the notes as depositary on behalf of other financial institutions that participate in the book-entry system of DTC (the “DTC participants”). These DTC participants, in turn, hold beneficial interests in the notes on behalf of themselves or their customers. Investors will not own notes issued in global form directly. Instead, they will own beneficial interests in a global note through a bank, broker or other financial institution that is itself a DTC participant or holds an interest through a DTC participant.

      An investor will be an indirect holder and must look to its bank or broker for payments on the notes and protection of its legal rights relating to the notes. DTC has advised us that it will take any action permitted to be taken by a holder of new notes only at the direction of one or more DTC participants whose accounts are credited with DTC interests in a global note.

      DTC has advised us that pursuant to procedures established by it (1) upon the issuance by us of the global notes representing the new notes, DTC or its nominee will credit the accounts of participants with the aggregate principal amount of the individual beneficial interest represented by these global notes and (2) ownership of beneficial interests in the new notes will be shown on, and the transfer of that ownership will be effected only through, records maintained by DTC with respect to its participants’ interests, the participants and the indirect participants. The laws of some jurisdictions require that certain persons take physical delivery in definitive form of securities that they own. Consequently, the ability to transfer beneficial interests in the global notes is limited to such extent.

      So long as a nominee of DTC is the registered owner of the global notes, such nominee will be considered the sole owner or holder of the global notes for all purposes under the indenture. Except as provided below, owners of beneficial interests in the global notes will not be entitled to have the new notes registered in their

names, will not receive or be entitled to receive physical delivery of the new notes in definitive form and will not be considered the owners or holders thereof under the indenture.

      Transfers of interests in a global note will be made by book-entry registration of each transfer within the records of DTC, in accordance with its procedures. Secondary market trading between DTC participants will occur in the ordinary way in accordance with DTC’s rules and will be settled in immediately available funds using DTC’s Same-Day Funds Settlement System.

      Principal and interest payments on the new notes will be made to DTC by wire transfer of immediately available funds. DTC’s practice is to credit participants’ accounts on the payable date in accordance with their respective holdings shown on DTC’s records unless DTC has reason to believe that it will not receive payment on the payable date. Payments by participants to beneficial owners will be governed by standing instructions and customary practices, as is the case with securities held for the accounts of customers in bearer form or registered in “street name” and will be the responsibility of such participant and not of DTC or us, subject to any statutory or regulatory requirements as may be in effect from time to time. Payment of principal and interest to DTC is our responsibility, disbursement of such payments to participants is the responsibility of DTC, and disbursement of such payments to the beneficial owners is the responsibility of participants and indirect participants. Neither we nor the trustee will have any responsibility or liability for any aspect of the records relating to or payments made on account of beneficial ownership interests in the global notes or for maintaining, supervising or reviewing any records relating to such beneficial ownership interests.

      DTC may discontinue providing its services as securities depositary with respect to the notes at any time by giving reasonable notice to us.

      New notes represented by a global note will be exchangeable for note certificates with the same terms in authorized denominations only if:

      In any such instance, an owner of a beneficial interest in the global notes will be entitled to physical delivery in definitive form of new notes represented by the global notes equal in principal amount to such beneficial interest and to have such notes registered in its name. New notes so issued in definitive form will be issued as registered notes in minimum denominations of $100,000 and integral multiples of $1,000 in excess thereof, unless otherwise specified by us. Our definitive notes can be transferred by presentation for registration to the registrar at its New York offices and must be duly endorsed by the holder or his attorney duly authorized in writing, or accompanied by a written instrument or instruments of transfer in form satisfactory to us or the trustee duly executed by the holder or his attorney duly authorized in writing. We may require payment of a sum sufficient to cover any tax or other governmental charge that may be imposed in connection with any exchange or registration of transfer of definitive notes.

      DTC has advised us as follows: DTC is a limited purpose trust company organized under the laws of the State of New York, a “banking organization” within the meaning of the New York Banking Law, a member of the Federal Reserve System, a “clearing corporation” within the meaning of the New York Uniform Commercial Code and a “clearing agency” registered pursuant to the provisions of Section 17A of the Securities Exchange Act of 1934. DTC was created to hold securities for its participants and to facilitate the clearance and settlement of securities transactions, such as transfers and pledges, among participants in deposited securities through electronic book-entry charges to accounts of its participants, thereby eliminating the need for physical movement of securities certificates. Participants include securities brokers and dealers, banks, trust companies, clearing corporations and certain other organizations. Certain of such participants (or

other representatives), together with other entities, own DTC. The rules applicable to DTC and its participants are on file with the SEC.

Global Clearance and Settlement Procedures

      As long as DTC is the depositary for the global notes, you may hold an interest in a global note through any organization that participates, directly or indirectly, in the DTC system. Those organizations include Euroclear Bank S.A./N.V., as operator of the Euroclear system, referred to as Euroclear, and Clearstream Banking, société anonyme, Luxembourg, known as Clearstream, Luxembourg. If you are a participant in either of those systems, you may hold your interest directly in that system. If you are not a participant, you may hold your interest indirectly through organizations that are participants in that system. If you hold your interest indirectly, you should note that DTC, Euroclear and Clearstream, Luxembourg will have no record of you or your relationship with the direct participant in their systems.

      Euroclear and Clearstream, Luxembourg are securities clearance systems in Europe, and they participate indirectly in DTC. Euroclear and Clearstream, Luxembourg will hold interests in the global notes on behalf of the participants in their systems, through securities accounts they maintain in their own names for their customers on their own books or on the books of their depositaries. Those depositaries, in turn, are participants in DTC and hold those interests in securities accounts they maintain in their own names on the books of DTC. Citibank, N.A. acts as depositary for Clearstream, Luxembourg and The Chase Manhattan Bank acts as depositary for Euroclear, Clearstream, Luxembourg and Euroclear clear and settle securities transactions between their participants through electronic, book-entry delivery of securities against payment.

      If you hold an interest in a global note through Clearstream, Luxembourg or Euroclear, that system will credit the payments we make on your note to the account of your Clearstream, Luxembourg or Euroclear participant in accordance with that system’s rules and procedures. The participant’s account will be credited only to the extent that the system’s depositary receives these payments through the DTC system. Payments, notices and other communications or deliveries relating to the notes, if made through Clearstream, Luxembourg or Euroclear, must comply not only with the rules and procedures of those systems, but also with the rules and procedures of DTC, except as described below.

      Trading in the notes between Clearstream, Luxembourg participants or between Euroclear participants will be governed only by the rules and procedures of that system. We understand that, at present, those systems’ rules and procedures applicable to trades in conventional eurobonds will apply to trades in the notes, with settlement in immediately available funds.

      Cross-market transfers of the notes — meaning transfers between investors who hold or will hold their interests through Clearstream, Luxembourg or Euroclear, on the one hand, and investors who hold or will hold their interests through DTC but not through Clearstream, Luxembourg or Euroclear, on the other hand — will be governed by DTC’s rules and procedures in addition to those of Clearstream, Luxembourg or Euroclear. If you hold your note through Clearstream, Luxembourg or Euroclear and you wish to complete a cross-market transfer, you will need to deliver transfer instructions and payment, if applicable, to Clearstream, Luxembourg or Euroclear, through your participant, and that system in turn will need to deliver them to DTC, through that system’s depositary.

      Because of time-zone differences between the United States and Europe, any notes you purchase through Clearstream, Luxembourg or Euroclear in a cross-market transfer will not be credited to your account at your Clearstream, Luxembourg or Euroclear participant until the business day after the DTC settlement date. For the same reason, if you sell the notes through Clearstream, Luxembourg or Euroclear in a cross-market transfer, your cash proceeds will be received by the depositary for that system on the DTC settlement date but will not be credited to your participant’s account until the business day following the DTC settlement date. In this context, “business day” means a business day for Clearstream, Luxembourg or Euroclear.

      The description of the clearing and settlement systems in this section reflects our understanding of the rules and procedures of DTC, Clearstream, Luxembourg and Euroclear as currently in effect. Those systems could change their rules and procedures at any time. We have no control over those systems and we take no responsibility for their activities.

IMPORTANT FEDERAL INCOME TAX CONSIDERATIONS

      The exchange of the old notes for new notes will not be treated as a taxable transaction for U.S. federal income tax purposes. Your basis and holding period in the new notes will equal your basis and holding period in the old notes exchanged for them.

      You should consult your own tax advisors concerning the tax consequences arising under state, local or foreign laws.

PLAN OF DISTRIBUTION

      Each broker-dealer that receives new notes for its own account in connection with the exchange offer must acknowledge that it will deliver a prospectus in connection with any resale of those new notes. A broker-dealer may use this prospectus, as amended or supplemented from time to time, in connection with resales of new notes received in exchange for old notes where such broker-dealer acquired old notes as a result of market-making activities or other trading activities. We have agreed that for a period of 30 days after the expiration date of the exchange offer, we will make available a prospectus, as amended or supplemented, meeting the requirements of Securities Act to any broker-dealer for use in connection with those resales.

      We will not receive any proceeds from any sale of new notes by broker-dealers. Broker-dealers may sell new notes received by them for their own account pursuant to the exchange offer from time to time in one or more transactions in the over-the-counter market, in negotiated transactions, through the writing of options on the new notes or a combination of those methods of resale, at market prices prevailing at the time of resale, at prices related to such prevailing market prices or negotiated prices. Any such resale may be made directly to purchasers or to or through brokers or dealers who may receive compensation in the form of commissions or concessions from any broker-dealer or the purchasers of any new notes.

      Any broker-dealer that resells new notes that were received by it for its own account pursuant to the exchange offer and any broker or dealer that participates in a distribution of such new notes may be deemed to be an “underwriter” within the meaning of the Securities Act and any profit on any such resale of new notes and any commission or concessions received by any such persons may be deemed to be underwriting compensation under the Securities Act. The letter of transmittal states that, by acknowledging that it will deliver and by delivering a prospectus, a broker-dealer will not be deemed to admit that it is an “underwriter” within the meaning of the Securities Act.

      For a period of 30 days after the expiration date of the exchange offer, we will promptly send additional copies of this prospectus and any amendment or supplement to this prospectus to any broker-dealer that requests these documents in the letter of transmittal. We have agreed to pay all expenses incident to the exchange offer, other than commission or concessions of any broker or dealers.

VALIDITY OF THE NOTES

      The validity of the new notes will be passed upon by Sullivan & Cromwell LLP, New York, New York. Partners of Sullivan & Cromwell LLP involved in the representation of AIG beneficially own approximately 11,360 shares of AIG common stock.

EXPERTS

      The consolidated financial statements, the financial statement schedules and management’s assessment of the effectiveness of internal control over financial reporting (which is included in Management’s Report on Internal Control over Financial Reporting) incorporated in this Prospectus by reference to the Annual Report on Form 10-K/A for the fiscal year ended December 31, 2005 have been so incorporated in reliance on the report (which contains an adverse opinion on the effectiveness of internal control over financial reporting) of PricewaterhouseCoopers LLP, an independent registered public accounting firm, given on the authority of said firm as experts in auditing and accounting.

AMERICAN INTERNATIONAL GROUP, INC.

OFFER TO EXCHANGE UP TO

$500,000,000 4.700% NOTES DUE 2010 AND

$1,000,000,000 5.050% NOTES DUE 2015

WHICH HAVE BEEN REGISTERED UNDER THE

SECURITIES ACT OF 1933

FOR

ANY AND ALL OUTSTANDING

4.700% NOTES DUE 2010 AND

5.050% NOTES DUE 2015

PROSPECTUS

July 25, 2006