FORM OF STOCKHOLDERS AGREEMENT

EXHIBIT 10.3

FORM OF STOCKHOLDERS AGREEMENT

dated as of              , 2009

by and

among

AMERICAN INTERNATIONAL GROUP, INC.,

AMERICAN HOME ASSURANCE COMPANY,

and

TRANSATLANTIC HOLDINGS, INC.

TABLE OF CONTENTS

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STOCKHOLDERS AGREEMENT

                    STOCKHOLDERS AGREEMENT, dated as of                     , 2009 (this “ Agreement ”), by and between TRANSATLANTIC HOLDINGS, INC., a Delaware corporation (the “ Company ”), AMERICAN INTERNATIONAL GROUP, INC., a Delaware corporation (“ AIG ”), and AMERICAN HOME ASSURANCE COMPANY, a New York domiciled insurance company (“ AHAC ”, and together with AIG, “ Stockholder ”).

RECITALS

                    WHEREAS, the Company and Stockholder have entered into a Master Separation Agreement, dated as of May 28, 2009 (the “ Separation Agreement ”), to effect the orderly separation of Stockholder and the Company;

                    WHEREAS, concurrently with the execution of the Separation Agreement, the Company filed a prospectus supplement to the prospectus contained in Post-Effective Amendment No. 1 to its registration statement on Form S-3 with the SEC for a public offering of all or some of the Shares (as defined below);

                    WHEREAS, as of the date hereof, AIG directly Beneficially Owns 17,073,690 shares of common stock, par value $1.00 per share, of the Company (“ Common Stock ”) (collectively, the “ AIG Shares ”);

                    WHEREAS, as of the date hereof, AHAC directly Beneficially Owns 22,018,972 shares of Common Stock (collectively, the “ AHAC Shares ”, and together with the AIG Shares, the “ Shares ”);

                    WHEREAS, pursuant to the Separation Agreement, Stockholder and the Company have agreed that if the Shares to be Beneficially Owned by Stockholder immediately following the sale of the Shares agreed to be sold pursuant to the Underwriting Agreement (without giving effect to the Underwriters’ option to purchase additional shares) would constitute at least 10% of the outstanding Common Stock following the Closing, the parties hereto would enter into this Agreement at Closing; and

                    WHEREAS, each of Stockholder and the Company desires, for its mutual benefit and protection, to enter into this Agreement with respect to certain matters relating to the operations and management of the Company, the disposition and voting of the Shares and certain other matters set forth herein.

                    NOW, THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt and adequacy of which is hereby acknowledged, and intending to be legally bound hereby, each of the Company and Stockholder agrees as follows:

ARTICLE I

DEFINITIONS AND INTERPRETATION

                    Section 1.1. Definitions . Unless otherwise defined herein, all capitalized terms used herein shall have the same meanings as set forth in the Separation Agreement. For purposes of this Agreement, the following terms have the meanings set forth below:

                    “ Affiliate ” means, with respect to any Person, any other Person directly or indirectly controlling, controlled by, or under common control with such Person; provided that, except as expressly provided herein, none of the (A)(i) the FRBNY or the U.S. Department of the Treasury or their respective Representatives, (ii) the AIG Credit Facility Trust, (iii) any insurance regulatory authority, (iv) the IRS or any other tax authority or (v) any other Person controlled by any of the foregoing, nor (B) the Company and its Subsidiaries shall be deemed Affiliates of Stockholder.

                     “ Agreement ” is defined in the Preamble.

                     “ AHAC ” is defined in the Preamble.

                     “ AHAC Shares ” is defined in the Recitals.

                     “ AIG ” is defined in the Preamble.

                     “ AIG Indemnified Parties ” is defined in Section 5.3(b) .

                     “ AIG Shares ” is defined in the Recitals.

                     “ Banks ” is defined in Section 4.2(a)(iii) .

                     “ Beneficial Ownership ”, “ Beneficial Owner ” and “ Beneficially Own ” refer to ownership by any Person who, directly or indirectly, through any contract, arrangement, understanding, relationship or otherwise, has or shares (i) voting power which includes the power to vote, or to direct the voting of, such security; and/or (ii) investment power which includes the power to dispose, or to direct the disposition of, such security; and shall otherwise be interpreted in accordance with the term “beneficial ownership” as defined in Rule 13d-3 adopted by the SEC under the Exchange Act.

                     “ Board ” means the board of directors of the Company.

                     “ Change of Control ” shall mean the occurrence of any of the following events: (i) Stockholder and its Affiliates become the Beneficial Owners of more than 50% of the outstanding Voting Stock; (ii) a merger or consolidation of the Company with or into another Person or the merger or consolidation of another Person into the Company, as a result of which transaction or series of related transactions Stockholder and its Affiliates become the Beneficial Owners of more than 50% of the Voting Stock outstanding immediately after such transaction or transactions; or (iii) the consummation of the sale, transfer, lease or other disposition (but not including a transfer, lease or other disposition by pledge or mortgage to a bona fide Lender) of

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all or substantially all of the assets of the Company and the Company Subsidiaries to Stockholder or its Affiliates. For the avoidance of doubt, Stockholder’s Beneficial Ownership of more than 50% of the outstanding Voting Stock prior to the date hereof shall not be considered a “Change of Control” for purposes of this definition.

                     “ Common Stock ” is defined in the Recitals.

                     “ Company ” is defined in the Preamble.

                     “ Company Indemnified Parties ” is defined in Section 5.3(a) .

                     “ Company Transaction Proposal ” is defined in Section 3.2(a)(ii)(A) .

                     “ Director ” means any member of the Board.

                     “ Equity Securities ” means any and all shares of capital stock of the Company, including, without limitation, any and all shares of Common Stock and Preferred Stock of the Company, securities of the Company convertible into, or exchangeable or exercisable for, such shares, and options, warrants or other rights to acquire such shares.

                     “ Exchange Act ” means the Securities Exchange Act of 1934, as amended, and the rules and regulations promulgated thereunder.

                     “ Fundamental Change ” means the occurrence of any of the following: (i) the consummation of any merger, consolidation, share exchange, recapitalization or other business combination transaction (or series of related transactions) as a result of which the Voting Stock immediately prior to such transaction (or series of related transactions) is converted into and/or continues to represent, in the aggregate, less than 50% of the outstanding securities having the right to vote for the election of directors of the Survivor of a Fundamental Change;

                               (ii) any Person or Group, together with any Affiliates thereof, becomes, directly or indirectly, the Beneficial Owner of more than 50% of the outstanding Voting Stock of the Company;

                               (iii) the consummation of the sale, transfer, lease or disposition by the Company or by one or more of its Subsidiaries of all or substantially all of the assets, business or securities of the Company (on a consolidated basis) to any Person or Group (other than the Company or its wholly owned Subsidiaries); or

                               (iv) during any period, the directors of the Company as of the date hereof (or any directors nominated by such directors) cease for any reason to constitute a majority of the Directors of the Board.

                    “ Group ” shall have the meaning assigned to it in Section 13(d)(3) of the Exchange Act.

                    “ Independent Director ” means any Director who without regard to whether the Company or Stockholder is listed on the NYSE, is or would be an “independent director” with

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respect to both the Company and Stockholder pursuant to Section 303A.02 of the New York Stock Exchange Listed Company Manual (or any successor provision thereof that is no less stringent than such section as in effect on the date hereof). For purposes of this Agreement, the Independent Directors shall not be deemed Affiliates of Stockholder.

                    “ Lenders ” is defined in Section 4.2(a)(iii) .

                    “ NYSE ” means the New York Stock Exchange, Inc.

                    “ Permitted Transferee ” means (i) any Affiliate directly or indirectly controlled by Stockholder; or (ii) the FRBNY, the U.S. Department of Treasury or any other Person as directed by the FRBNY or the U.S. Department of Treasury.

                    “ Preferred Stock ” means the shares of preferred stock, par value $1.00 per share, of the Company and any securities issued in respect thereof, or in substitution therefor, in connection with any stock split, dividend or combination, or any reclassification, recapitalization, merger, consolidation, exchange or other similar reorganization.

                    “ Public Offering ” means a public offering of shares of Common Stock pursuant to an effective registration statement (other than on Form S–4, Form S–8 or their equivalent) filed with the SEC pursuant to the Securities Act.

                    “ Secured Loan ” is defined in Section 4.2(a)(iii) .

                    “ Securities Act ” means the Securities Act of 1933, as amended, and the rules and regulations thereunder.

                    “ Separation Agreement ” is defined in the Recitals.

                    “ Shares ” is defined in the Recitals.

                    “ Stockholder ” is defined in the Preamble.

                    “ Survivor of a Fundamental Change ” means (a) the issuer of the securities received by the holders of Common Stock (in their capacities as such) upon the occurrence of a Fundamental Change, to the extent the holders of Common Stock receive other securities in exchange, conversion or substitution of their shares of Common Stock in the transaction that resulted in such Fundamental Change or (b) the Company (or its successor) in all other circumstances of a Fundamental Change.

                    “ Termination Date ” is defined in Section 7.1(ii) .

                    “ Transfer ” means, directly or indirectly, to sell, transfer, assign, pledge, encumber, hypothecate or similarly dispose of (by operation of law or otherwise), either voluntarily or involuntarily, or to enter into any contract, option or other arrangement or understanding with respect to the sale, transfer, assignment, pledge, encumbrance, hypothecation or similar disposition of (by operation of law or otherwise), any Shares or any interest in any Shares; provided , however , that a merger or consolidation in which Stockholder or any of its

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Affiliates is a constituent corporation shall not be deemed to be the Transfer of any Shares Beneficially Owned by such Person ( provided that a purpose of any such transaction is not to avoid the provisions of this Agreement and that the successor or surviving Person to such merger or consolidation, if not Stockholder or such Affiliate, expressly assumes all obligations of Stockholder or such Affiliate, as the case may be, under this Agreement).

                    “ Voting Stock ” means shares of Common Stock and any other securities of the Company or its successor having the power to vote in the election of Directors of the Company or its successor.

                    Section 1.2. Interpretation . (a) The headings in this Agreement are for convenience of reference only, do not constitute part of this Agreement and shall not be deemed to limit or otherwise affect any of the provisions of this Agreement.

                     (b) The parties have participated jointly in negotiating and drafting this Agreement. In the event that an ambiguity or a question of intent or interpretation arises, this Agreement shall be construed as if drafted jointly by the parties, and no presumption or burden of proof shall arise favoring or disfavoring any party by virtue of the authorship of any provision of this Agreement.

                     (c) For purposes of this Agreement, except where otherwise expressly provided or unless the context otherwise necessarily requires: (i) references to this Agreement shall include a reference to all exhibits and schedules hereto; (ii) the words “hereof”, “herein” and “hereto”, and words of similar import, when used in this Agreement refer to this Agreement as a whole and not to any particular provision of this Agreement; (iii) references to the Preamble, Recitals, Articles, Sections or Schedules are to the preamble, recitals, articles, sections or schedules to this Agreement; (iv) whenever the words “include,” “includes” or “including” are used in this Agreement, they shall be deemed to be followed by the words “without limitation” and shall not be construed to mean that the examples given are an exclusive list of the topics covered; (v) meanings specified in this Agreement are applicable to both the singular and plural forms of these terms and to the masculine, feminine and neuter genders, as the context requires; (vi) references to a Person include its successors and permitted assigns; (vii) references to any agreement, instrument or other document means such agreement, instrument or other document as amended, modified or supplemented from time to time, including by waiver or consent, and all attachments thereto and instruments incorporated therein; (viii) if a word or phrase is defined, the other grammatical forms of such word or phrase have a corresponding meaning; (ix) references to any Law is a reference to that Law and the rules and regulations adopted or promulgated thereunder, in each case, as amended, modified or supplemented as of the date on which the reference is made, and all attachments thereto and instruments incorporated therein; (x) references to any section of any statute, listing rule, rule, standard, regulation or other law include any successor to such section; (xi) references to times of day or dates are to local times or dates in New York, New York; and (xii) references to currency are references to the lawful money of the United States.

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ARTICLE II

VOTING AGREEMENTS

                    Section 2.1. Voting Agreements . (a) Stockholder shall vote at every duly called annual or special meeting of stockholders of the Company, and at every postponement or adjournment thereof, or act by written consent for all of the Shares Beneficially Owned by it entitled to vote thereat: (i) in the manner recommended by the Board with respect to the election of any Director nominee or removal of any existing Director of the Board; and (ii) in favor of each matter required to effectuate any provision of this Agreement. Notwithstanding the foregoing, if Stockholder Beneficially Owns more than 30% of the outstanding Common Stock, Stockholder shall vote the number of shares Beneficially Owned by it in excess of 30% of the outstanding Common Stock in a manner proportionate to the holders of the Common Stock (other than Stockholder, stockholders of the Company Beneficially Owning more than 10% of the outstanding Common Stock and directors and officers of the Company) voting on such matter in connection with any election of any Director nominee or removal of any existing Director of the Board.

                    (b) Stockholder shall cause any and all Shares Beneficially Owned by it and entitled to Vote thereat to be present in person or represented by proxy at all annual and special meetings of stockholders of the Company to the extent necessary so that all Shares Beneficially Owned by it shall be counted as present for the purposes of determining the presence of a quorum at such meeting and to vote such shares in accordance with Section 2.1(a) .

                    Section 2.2. Termination of Article II . This Article II shall terminate and be of no further effect at such time as the Shares Beneficially Owned by Stockholder no longer constitute at least 10% of the outstanding Common Stock. Notwithstanding the foregoing, the rights and obligations of Stockholder under this Article II shall survive a Fundamental Change to the extent that the Shares Beneficially Owned by Stockholder continue to constitute at least 10% of the total securities having the right to vote for the election of directors of the Survivor of a Fundamental Change; provided that, for all purposes of this Article II , if the Company is not the Survivor of a Fundamental Change, the board of directors of the Survivor of a Fundamental Change shall be substituted for the Board.

ARTICLE III

STANDSTILL

                    Section 3.1. Acquisition of Common Stock . (a) Except as provided in Sections 3.1(b) and 3.2 , Stockholder covenants and agrees with the Company that it will not, and will cause its Affiliates and their respective directors and executive officers not to, directly or indirectly, Beneficially Own or acquire, offer or propose to acquire, or agree to acquire, whether by purchase, tender or exchange offer, through the acquisition of control of another Person (including by way of merger or consolidation), by joining a partnership, syndicate or other Group or otherwise, the Beneficial Ownership of, any shares of Common Stock other than the shares of Common Stock Beneficially Owned by Stockholder and its Affiliates and their respective directors and executive officers as of the date hereof (except by way of stock splits, stock

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dividends, stock reclassifications or other distributions, recapitalizations or offerings made available to and, if applicable, exercised on a pro rata basis by, holders of Common Stock generally.

                    (b) Notwithstanding the foregoing, the prohibition set forth in Section 3.1(a) shall not apply to (i) the acquisition (whether by merger, consolidation or otherwise) by Stockholder or an Affiliate thereof of any entity that Beneficially Owns shares of Common Stock at the time of the consummation of such acquisition, provided that in connection with any such acquisition Stockholder or its Affiliate, as the case may be, (A) divests the shares of Common Stock Beneficially Owned by the acquired entity at the time of the consummation of such acquisition (other than any shares of Common Stock acquired in the ordinary course activities of the acquired entity as contemplated by clause (ii) below) within a reasonable period of time after the consummation of such acquisition, and (B) if any annual or special meeting of shareholders is held prior to the disposition thereof, votes such shares on each matter presented at any annual or special meeting of the stockholders or by written consent in a manner proportionate to the holders of the Common Stock (other than Stockholder, stockholders of the Company Beneficially Owning more than 10% of the outstanding Common Stock, and directors and officers of the Company) voting on such matter or (ii) ordinary course activities of Stockholder and its Affiliates and their respective directors and executive officers, including (A) proprietary and third party fund and asset management activities, (B) brokerage and securities trading activities, (C) financial services and insurance activities and (D) the acquisition of shares of Common Stock in connection with securing or collecting a debt previously contracted in good faith; provided that the purpose of any such transaction is not to avoid the provisions of this Agreement.

                    (c) For the avoidance of doubt, this Agreement shall not be deemed to apply to any Common Stock owned or acquired by individuals who are officers or employees of the Company or any of its Subsidiaries or directors of the Company or any of its Subsidiaries.

                    Section 3.2. Certain Restrictions . (a) Except as required in connection with the execution, delivery or performance of this Agreement and as otherwise required, permitted or contemplated by this Agreement or any other Transaction Agreement (including with respect to any Transfer permitted pursuant to Section 4.2(a) ), Stockholder agrees not to, and to cause each of its Affiliates and its and their respective directors and executive officers not to, directly or indirectly, alone or in concert with others, without express authorization of the Company:

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