Exhibit (4)

                     AGREEMENT AND PLAN OF REORGANIZATION

   This Agreement and Plan of Reorganization (the "Agreement") is made as of
February 13, 2008, by and between Gateway Fund (the "Acquired Fund"), a series
of The Gateway Trust, an Ohio business trust (the "Existing Trust"), and
Gateway Fund (the "Acquiring Fund"), a series of Gateway Trust, a Massachusetts
business trust (the "New Trust").

                            PLAN OF REORGANIZATION

   (a) The Acquired Fund shall sell, assign, convey, transfer and deliver to
the Acquiring Fund on the Exchange Date (as defined in Section 6) all of its
properties and assets. In consideration therefor, the Acquiring Fund shall, on
the Exchange Date, assume all of the known and unknown liabilities of the
Acquired Fund existing at the Valuation Time (as defined in Section 3(c)) and
deliver to the Acquired Fund a number of full and fractional Class A shares of
beneficial interest of the Acquiring Fund (the "Merger Shares") having an
aggregate net asset value equal to the value of the assets of the Acquired Fund
transferred to the Acquiring Fund on such date less the value of the
liabilities of the Acquired Fund assumed by the Acquiring Fund on that date. It
is intended that the reorganization described in this Agreement shall be a
reorganization within the meaning of Section 368 of the Internal Revenue Code
of 1986, as amended and in effect from time to time (the "Code").

   (b) Upon consummation of the transactions described in paragraph (a) of this
Plan of Reorganization, the Acquired Fund shall distribute the Merger Shares in
complete liquidation to its shareholders of record as of the Exchange Date,
each shareholder being entitled to receive that proportion of Merger Shares
which the number of shares of the Acquired Fund held by such shareholder bears
to the total number of shares of the Acquired Fund outstanding on such date.
Certificates representing the Merger Shares will not be issued. All issued and
outstanding shares of beneficial interest of the Acquired Fund will
simultaneously be cancelled on the books of the Acquired Fund.

   (c) As soon as practicable following the liquidation of the Acquired Fund as
aforesaid, the Acquired Fund shall be dissolved pursuant to the provisions of
the Second Amended Agreement and Declaration of Trust of the Existing Trust, as
amended, and applicable law, and its legal existence terminated. Any reporting
responsibility of the Acquired Fund is and shall remain the responsibility of
the Acquired Fund up to and including the Exchange Date and, if applicable,
such later date on which the Acquired Fund is dissolved.



                                   AGREEMENT

   The New Trust, on behalf of the Acquiring Fund, and the Existing Trust, on
behalf of the Acquired Fund, agree as follows:

   1. Representations, Warranties and Agreements of the Acquiring Fund. The New
Trust, and not the individual Trustees and officers thereof, on behalf of the
Acquiring Fund, represents and warrants to the best of its knowledge and agrees
with the Existing Trust, on behalf of the Acquired Fund that:

      a. The Acquiring Fund is a series of shares of the New Trust, a
   Massachusetts business trust duly established and validly existing under the
   laws of the Commonwealth of Massachusetts, and has power to own all of its
   properties and assets and to carry out its obligations under this Agreement.
   The New Trust is qualified as a foreign association in every jurisdiction
   where required, except to the extent that failure to so qualify would not
   have a material adverse effect on the New Trust or the Acquiring Fund. Each
   of the New Trust and the Acquiring Fund has all necessary federal, state and
   local authorizations to carry on its business as now being conducted and to
   carry out this Agreement.

      b. The New Trust is registered under the Investment Company Act of 1940,
   as amended (the "1940 Act"), as an open-end management investment company,
   and such registration has not been revoked or rescinded and is in full force
   and effect.

      c. The Acquiring Fund has no assets and liabilities, except for nominal
   shares issued and redeemed prior to the consummation of the transactions
   contemplated hereby.

      d. The New Trust is not in violation in any material respect of any
   provisions of its Agreement and Declaration of Trust or By-Laws or of any
   agreement, indenture, instrument, contract, lease or other undertaking to
   which the New Trust is a party or by which the Acquiring Fund is bound, and
   the execution, delivery and performance of this Agreement will not result in
   any such violation.

      e. The prospectuses and statement of additional information of the
   Acquiring Fund, each dated November 21, 2007 and each as from time to time
   amended or supplemented (collectively, the "Acquiring Fund Prospectus"),
   previously furnished to the Acquired Fund, (i) conform in all material
   respects to the applicable requirements of the Securities Act of 1933, as
   amended (the "1933 Act"), and (ii) did not as of such date and do not
   contain, with respect to the New Trust or the Acquiring Fund, any untrue
   statements of a material fact or omit to state a material fact required to
   be stated therein or necessary to make the statements therein not misleading.

      f. There are no material legal, administrative or other proceedings
   pending or threatened against the New Trust or the Acquiring Fund, which
   assert liability on the part of the New Trust or the Acquiring Fund. Neither
   the New Trust nor the Acquiring Fund knows of any facts which might form the
   basis for the institution of such

                                      -2-



   proceedings or is not a party to or subject to the provisions of any order,
   decree or judgment of any court or governmental body which materially and
   adversely affects its business or its ability to consummate the transactions
   herein contemplated.

      g. The Acquiring Fund has no known liabilities of a material nature,
   contingent or otherwise.

      h. The Acquiring Fund has not commenced operations and has not yet filed
   its first federal income tax return. At the completion of its first taxable
   year, the Acquiring Fund will file its federal income tax return as a
   "regulated investment company" and until such time will take all steps
   necessary to ensure that it qualifies for taxation as a "regulated
   investment company" under Sections 851 and 852 of the Code.

      i. No consent, approval, authorization or order of any court or
   governmental authority is required for the consummation by the Acquiring
   Fund of the transactions contemplated by this Agreement, except such as may
   be required under the 1933 Act, the Securities Exchange Act of 1934, as
   amended (the "1934 Act"), the 1940 Act and state securities or "Blue Sky"
   laws (which term as used herein shall include the laws of the District of
   Columbia and of Puerto Rico).

      j. There are no material contracts outstanding to which the Acquiring
   Fund is a party, other than as are or will be disclosed in the Registration
   Statement or the Acquired Fund Proxy Statement (each as defined in
   Section 1(p) herein) or the Acquiring Fund Prospectus.

      k. All of the issued and outstanding shares of beneficial interest of the
   Acquiring Fund have been offered for sale and sold in conformity with all
   applicable federal and state securities laws (including any applicable
   exemptions therefrom), or the Acquiring Fund has taken any action necessary
   to remedy any prior failure to have offered for sale and sold such shares in
   conformity with such laws.

      l. The Merger Shares will be registered under the 1933 Act with the
   Securities and Exchange Commission upon effectiveness of the Registration
   Statement (as defined in Section 1(p) herein) and the issuance, offering and
   sale of the Merger Shares pursuant to this Agreement will be in compliance
   with all applicable federal and state securities or "Blue Sky" laws.

      m. The Merger Shares to be issued to the Acquired Fund have been duly
   authorized and, when issued and delivered pursuant to this Agreement, will
   be legally and validly issued Class A shares of beneficial interest in the
   Acquiring Fund and will be fully paid and, except as set forth in the
   Registration Statement, nonassessable by the Acquiring Fund, and no
   shareholder of the Acquiring Fund will have any preemptive right of
   subscription or purchase in respect thereof.

      n. All shares of the Acquiring Fund that are issued and outstanding have
   been, are, and at the Exchange Date will be, duly and validly issued and
   outstanding, fully paid and, except as set forth in the Registration
   Statement, nonassessable by the Acquiring Fund. The Acquiring Fund does not
   have outstanding any options, warrants or

                                      -3-



   other rights to subscribe for or purchase any of the Acquiring Fund shares,
   nor is there outstanding any security convertible into any of the Acquiring
   Fund shares.

      o. The Acquiring Fund has not yet commenced investment operations.

      p. The registration statement on Form N-14 (the "Registration Statement")
   filed with the Securities and Exchange Commission (the "Commission") by the
   New Trust on behalf of the Acquiring Fund, which registers the Merger Shares
   issuable hereunder and is also the proxy statement of the Acquired Fund
   relating to the meeting of the Acquired Fund's shareholders referred to in
   Section 7 herein (together with the documents incorporated therein by
   reference, the "Acquired Fund Proxy Statement"), on the effective date of
   the Registration Statement (i) did comply, does comply and will comply at
   all relevant times in all material respects with the provisions of the 1933
   Act, the 1934 Act and the 1940 Act and the rules and regulations thereunder
   and (ii) did not, does not, and will not at any relevant times contain any
   untrue statement of a material fact or omit to state a material fact
   required to be stated therein or necessary to make the statements therein
   not misleading; and at the time of the shareholders' meeting referred to in
   Section 7 and on the Exchange Date, the prospectus which is contained in the
   Registration Statement, as amended or supplemented by any amendments or
   supplements filed with the Commission by the New Trust, and the Acquired
   Fund Proxy Statement did not and will not contain any untrue statement of a
   material fact or omit to state a material fact required to be stated therein
   or necessary to make the statements therein not misleading; provided,
   however, that none of the representations and warranties in this
   subparagraph (p) shall apply to statements in or omissions from the
   Registration Statement or the Acquired Fund Proxy Statement made in reliance
   upon and in conformity with information furnished by the Acquired Fund for
   use in the Registration Statement or the Acquired Fund Proxy Statement.

      q. The New Trust satisfies the fund governance standards defined in Rule
   0-1(a)(7) under the 1940 Act.

   2. Representations, Warranties and Agreements of the Acquired Fund. The
Existing Trust, and not the individual Trustees and officers thereof, on behalf
of the Acquired Fund, represents and warrants to the best of its knowledge and
agrees with the New Trust, on behalf of the Acquiring Fund that:

      a. The Acquired Fund is a series of shares of the Gateway Trust, an Ohio
   business trust duly established and validly existing under the laws of the
   State of Ohio, and has power to own all of its properties and assets and to
   carry out this Agreement. The Existing Trust is qualified as a foreign
   association in every jurisdiction where required, except to the extent that
   failure to so qualify would not have a material adverse effect on the
   Existing Trust or the Acquired Fund. Each of the Existing Trust and the
   Acquired Fund has all necessary federal, state and local authorizations to
   own all of its properties and assets and to carry on its business as now
   being conducted and to carry out this Agreement.

                                      -4-



      b. The Existing Trust is registered under the 1940 Act as an open-end
   management investment company, and such registration has not been revoked or
   rescinded and is in full force and effect.

      c. A statement of assets and liabilities, statement of operations,
   statement of changes in net assets and a schedule of investments (indicating
   their market values) of the Acquired Fund as of and for the period ended
   December 31, 2006 and a statement of assets and liabilities, statement of
   operations, statement of changes in net assets and a schedule of investments
   for the six months ended June 30, 2007 have been furnished to the Acquiring
   Fund prior to the Exchange Date. Such statement of assets and liabilities
   and schedule fairly present the financial position of the Acquired Fund as
   of such date and said statements of operations and changes in net assets
   fairly reflect the results of its operations and changes in net assets for
   the periods covered thereby in conformity with generally accepted accounting
   principles.

      d. Since June 30, 2007 there has not been any material adverse change in
   the Acquired Fund's financial condition, assets, liabilities or business
   (other than changes occurring in the ordinary course of business), or any
   incurrence by the Acquired Fund of indebtedness, except as disclosed in
   writing to the Acquiring Fund. For the purposes of this subsection (d) and
   of Section 9(a) of this Agreement, distributions of net investment income
   and net realized capital gains, changes in portfolio securities, changes in
   the market value of portfolio securities or net redemptions shall be deemed
   to be in the ordinary course of business.

      e. The Existing Trust is not in violation in any material respect of any
   provision of its Agreement and Declaration of Trust or By-Laws or of any
   agreement, indenture, instrument, contract, lease or other undertaking to
   which the Existing Trust is a party or by which the Acquired Fund is bound,
   and the execution, delivery and performance of this Agreement will not
   result in any such violation.

      f. The prospectus and the statement of additional information of the
   Acquired Fund, each dated May 1, 2007 and each as from time to time amended
   or supplemented (collectively, the "Acquired Fund Prospectus"), previously
   furnished to the Acquiring Fund (i) conform in all material respects to the
   applicable requirements of the 1933 Act and (ii) did not contain as of such
   date and do not contain, with respect to the Existing Trust and the Acquired
   Fund, any untrue statement of a material fact or omit to state a material
   fact required to be stated therein or necessary to make the statements
   therein not misleading.

      g. The Acquired Fund's investment operations from January 1, 2002 to the
   date hereof have been in compliance in all material respects with the
   investment policies and investment restrictions set forth in the Acquired
   Fund Prospectus.

      h. At the Exchange Date, the Existing Trust, on behalf of the Acquired
   Fund, will have good and marketable title to its assets to be transferred to
   the Acquiring Fund pursuant to this Agreement and will have full right,
   power and authority to sell, assign, transfer and deliver the Investments
   (as defined below) and all other assets and known

                                      -5-



   and unknown liabilities of the Acquired Fund to be transferred to the
   Acquiring Fund pursuant to this Agreement. At the Exchange Date, subject
   only to the delivery of the Investments and any such other assets and
   liabilities and payment therefor as contemplated by this Agreement, the
   Acquiring Fund will acquire good and marketable title thereto and will
   acquire the Investments and any such other assets and liabilities subject to
   no encumbrances, liens or security interests whatsoever and without any
   restrictions upon the transfer thereof, except as previously disclosed in
   writing to the Acquiring Fund.

      i. There are no material legal, administrative or other proceedings
   pending or threatened against the Existing Trust or the Acquired Fund, which
   assert liability on the part of the Existing Trust or the Acquired Fund. The
   Acquired Fund knows of no facts which might form the basis for the
   institution of such proceedings and is not a party to or subject to the
   provisions of any order, decree or judgment of any court or governmental
   body which materially and adversely affects its business or its ability to
   consummate the transactions herein contemplated.

      j. There are no material contracts outstanding to which the Acquired Fund
   is a party, other than as are or will be disclosed in Acquired Fund
   Prospectus, the registration statement on Form N-1A of the Acquired Fund or
   the Acquired Fund Proxy Statement, or have been disclosed or made available
   to Natixis Asset Management Advisors, L.P.

      k. The Acquired Fund has no known liabilities of a material nature,
   contingent or otherwise, other than those that are shown on the Acquired
   Fund's statement of assets and liabilities as of June 30, 2007 referred to
   above and those incurred in the ordinary course of its business as an
   investment company since such date. Prior to the Exchange Date, the Acquired
   Fund will quantify and reflect on its balance sheet all of its material
   known liabilities and will advise the Acquiring Fund of all material
   liabilities, contingent or otherwise, incurred by it subsequent to June 30,
   2007 whether or not incurred in the ordinary course of business.

      l. As of the Exchange Date, the Acquired Fund will have filed all
   required federal and other tax returns and reports which, to the knowledge
   of the Existing Trust's officers, are required to have been filed by the
   Acquired Fund by such date and has paid or will pay all federal and other
   taxes shown to be due on said returns or on any assessments received by the
   Acquired Fund. All tax liabilities of the Acquired Fund have been adequately
   provided for on its books, and no tax deficiency or liability of the
   Acquired Fund has been asserted, and no question with respect thereto has
   been raised or is under audit by the Internal Revenue Service or by any
   state, local or other tax authority for taxes in excess of those already
   paid.

      m. The Existing Trust, on behalf of the Acquired Fund, has and, at the
   Exchange Date, will have, full right, power and authority to sell, assign,
   transfer and deliver the Investments (as defined below) and any other assets
   and liabilities of the Acquired Fund to be transferred to the Acquiring Fund
   pursuant to this Agreement. At the Exchange Date, subject only to the
   delivery of the Investments and any such other

                                      -6-



   assets and liabilities as contemplated by this Agreement, the Acquiring Fund
   will acquire the Investments and any such other assets and liabilities
   subject to no encumbrances, liens or security interests whatsoever and
   without any restrictions upon the transfer thereof. As used in this
   Agreement, the term "Investments" shall mean the Acquired Fund's investments
   shown on the schedule of its investments as of June 30, 2007 referred to in
   Section 2(c) hereof, as modified by such changes in the portfolio as the
   Acquired Fund shall make in the ordinary course of business since such date,
   and changes resulting from stock dividends, stock split-ups, mergers and
   similar corporate actions through the Exchange Date.

      n. No registration under the 1933 Act of any of the Investments would be
   required if they were, as of the time of such transfer, the subject of a
   public distribution by either of the Acquiring Fund or the Acquired Fund,
   except as previously disclosed to the Acquiring Fund by the Acquired Fund.

      o. No consent, approval, authorization or order of any court or
   governmental authority is required for the consummation by the Acquired Fund
   of the transactions contemplated by this Agreement, except such as may be
   required under the 1933 Act, 1934 Act, the 1940 Act or state securities or
   "Blue Sky" laws.

      p. The Acquired Fund qualifies and will at all times through the Exchange
   Date qualify for taxation as a "regulated investment company" under
   Subchapter M of the Code. The Acquired Fund has satisfied or will satisfy
   the diversification requirement under Subchapter M of the Code at the end of
   the fiscal quarters ending March 31, 2007, June 30, 2007, September 30,
   2007, and December 31, 2007.

      q. At the Exchange Date, the Acquired Fund will have sold such of its
   assets, if any, as are necessary to assure that, after giving effect to the
   acquisition of the assets of the Acquired Fund pursuant to this Agreement,
   the Acquiring Fund will remain a "diversified company" within the meaning of
   Section 5(b)(1) of the 1940 Act and in compliance with all other investment
   restrictions set forth in the Acquired Fund Prospectus, as amended through
   the Exchange Date.

      r. All of the issued and outstanding shares of beneficial interest of the
   Acquired Fund have been offered for sale and sold in conformity with all
   applicable federal and state securities laws (including any applicable
   exemptions therefrom), or the Acquired Fund has taken any action necessary
   to remedy any prior failure to have offered for sale and sold such shares in
   conformity with such laws.

      s. All issued and outstanding shares of beneficial interest of the
   Acquired Fund are, and at the Exchange Date will be, duly and validly issued
   and outstanding, fully paid and non-assessable by the Acquired Fund. The
   Acquired Fund does not have outstanding any options, warrants or other
   rights to subscribe for or purchase any of the Acquired Fund shares, nor is
   there outstanding any security convertible into any of the Acquired Fund
   shares.

                                      -7-



      t. The Acquired Fund Proxy Statement, on the date of its filing
   (i) complied in all material respects with the provisions of the 1933 Act,
   the 1934 Act and the 1940 Act and the rules and regulations thereunder and
   (ii) did not contain any untrue statement of a material fact or omit to
   state a material fact required to be stated therein or necessary to make the
   statements therein not misleading; and at the time of the shareholders'
   meeting referred to in Section 7 and on the Exchange Date, the Acquired Fund
   Proxy Statement did not and will not contain any untrue statement of a
   material fact or omit to state a material fact required to be stated therein
   or necessary to make the statements therein not misleading; provided,
   however, that none of the representations and warranties in this subsection
   shall apply to statements in or omissions from the Acquired Fund Proxy
   Statement made in reliance upon and in conformity with information furnished
   by the Acquiring Fund for use in the Acquired Fund Proxy Statement.

      u. The Existing Trust has no material contracts or other commitments
   (other than this Agreement, such other contracts as may be entered into in
   the ordinary course of its business and such other contracts as have been
   previously disclosed or made available to Natixis Asset Management Advisors,
   L.P.) which if terminated may result in material liability to the Acquired
   Fund (or to the Acquiring Fund as a result of the transactions contemplated
   by this Agreement) or under which (whether or not terminated) any material
   payments for periods subsequent to the Exchange Date will be due from the
   Acquired Fund (or from the Acquiring Fund as a result of the transactions
   contemplated by this Agreement).

      v. The information provided by the Acquired Fund for use in the
   Registration Statement and Proxy Statement was accurate and complete in all
   material respects when supplied and complied with federal securities and
   other laws and regulations applicable thereto in all material respects, and
   has remained accurate and complete and in such compliance through the date
   hereof.

      w. Gateway Investment Advisers, L.P. does not have any right under any
   current fee waiver, expense reimbursement or similar arrangement with the
   Acquired Fund to recoup any waived or reimbursed fees or expenses.

      x. The Existing Trust satisfies the fund governance standards defined in
   Rule 0-1(a)(7) under the 1940 Act.

   3. Reorganization.

      a. Subject to the requisite approval of the shareholders of the Acquired
   Fund and to the other terms and conditions contained herein, the Acquired
   Fund agrees to sell, assign, convey, transfer and deliver to the Acquiring
   Fund, and the Acquiring Fund agrees to acquire from the Acquired Fund, on
   the Exchange Date all of the Investments and all of the cash and other
   properties and assets of the Acquired Fund, whether accrued or contingent,
   in exchange for that number of shares of beneficial interest of the
   Acquiring Fund provided for in Section 4 and the assumption by the Acquiring
   Fund of all of the liabilities of the Acquired Fund, whether accrued or
   contingent, existing at the Valuation Time. The Acquired Fund will, as soon
   as practicable after the Exchange

                                      -8-



   Date, distribute in complete liquidation all of the Merger Shares received
   by it to the shareholders of the Acquired Fund in exchange for their shares
   of the Acquired Fund.

      b. The Existing Trust, on behalf of the Acquired Fund, will pay or cause
   to be paid to the Acquiring Fund any interest, cash or such dividends,
   rights and other payments received for the account of the Acquired Fund on
   or after the Exchange Date with respect to the Investments and other
   properties and assets of the Acquired Fund, whether accrued or contingent,
   received on or after the Exchange Date. Any such distribution shall be
   deemed included in the assets transferred to the Acquiring Fund at the
   Exchange Date and shall not be separately valued unless the securities in
   respect of which such distribution is made shall have gone "ex" such
   distribution prior to the Valuation Time, in which case any such
   distribution which remains unpaid at the Exchange Date shall be included in
   the determination of the value of the assets of the Acquired Fund acquired
   by the Acquiring Fund.

      c. The Valuation Time shall be 4:00 p.m. Eastern time on the Exchange
   Date or such other time as may be mutually agreed upon in writing by the
   parties hereto (the "Valuation Time").

      d. In the event that immediately prior to the Valuation Time (a) the New
   York Stock Exchange shall be closed to trading or trading thereon shall be
   restricted, or (b) trading or the reporting of trading on said Exchange or
   elsewhere shall be disrupted so that accurate appraisal of the net asset
   value of the Acquired Fund or the Acquiring Fund is impracticable, the
   Exchange Date shall be postponed until the first business day after the day
   when trading shall have been fully resumed and reporting shall have been
   restored or such other date as may be agreed upon by the New Trust and
   Existing Trust; provided that if trading shall not be fully resumed and
   reporting restored within seven business days after the Exchange Date, this
   Agreement may be terminated by Acquiring Fund or the Acquired Fund upon the
   giving of written notice to the other party.

   4. Exchange Date; Valuation Time. On the Exchange Date, the Acquiring Fund
will deliver to the Acquired Fund a number of full and fractional Merger Shares
having an aggregate net asset value equal to the value of the assets of the
Acquired Fund on such date less the value of the liabilities of the Acquired
Fund assumed by the Acquiring Fund on that date, determined as hereinafter
provided in this Section 4.

      a. The net asset value of the Merger Shares to be delivered to the
   Acquired Fund, the value of the assets of the Acquired Fund, and the value
   of the liabilities of the Acquired Fund to be assumed by the Acquiring Fund,
   shall in each case be determined as of the Valuation Time.

      b. The net asset value of the Merger Shares shall be computed in the
   manner set forth in the Acquiring Fund Prospectus. The value of the assets
   and liabilities of the Acquired Fund shall be determined by the Acquiring
   Fund, in cooperation with the Acquired Fund, pursuant to procedures which
   the Acquiring Fund would use in determining the fair market value of the
   Acquiring Fund's assets and liabilities. Each of the Existing Trust, on
   behalf of the Acquired Fund, and the New Trust, on behalf of the

                                      -9-



   Acquiring Fund, hereby agrees to cooperate with the other party in valuing
   the securities held by the Acquired Fund and agrees to take reasonable steps
   to ensure that the valuation procedures used by the Acquired Fund and the
   Acquiring Fund as of the Valuation Time are substantially identical.

      c. No adjustment shall be made in the net asset value of either the
   Acquired Fund or the Acquiring Fund to take into account differences in
   realized and unrealized gains and losses.

      d. The Acquiring Fund shall issue the Merger Shares to the Acquired Fund.
   The Acquired Fund shall promptly distribute the Merger Shares to the
   shareholders of the Acquired Fund by establishing open accounts for each
   Acquired Fund shareholder on the transfer records of the Acquiring Fund. The
   Acquiring Fund and the Acquired Fund agree to cooperate in the establishment
   of such open accounts. Certificates representing Merger Shares will not be
   issued to Acquired Fund shareholders. Any certificates representing shares
   of the Acquired Fund shall automatically be cancelled and each holder of a
   certificate representing shares of the Acquired Fund shall cease to have any
   rights with respect thereto, except the right to receive Merger Shares as
   provided herein.

      e. On the Exchange Date, the Acquiring Fund shall assume all liabilities
   of the Acquired Fund, whether accrued or contingent, known or unknown, in
   connection with the acquisition of assets and subsequent liquidation and
   dissolution of the Acquired Fund or otherwise.

   5. Expenses, Fees, etc.

      a. Except as otherwise provided in this Section 5, IXIS Anchor
   Acquisition, LLC (to be renamed Gateway Investment Advisers, LLC as of 4:01
   p.m. on February 15, 2008), by countersigning this Agreement, agrees that it
   will bear any and all costs and expenses of the transaction incurred by the
   Acquiring Fund and the Acquired Fund including the costs and expenses of the
   dissolution of the Acquired Fund, including without limitation the costs and
   expenses of any state or federal filings to terminate the existence of the
   Existing Trust and deregister the Existing Trust as an investment company;
   provided, however, that the Acquiring Fund and the Acquired Fund will each
   pay any brokerage commissions, dealer mark-ups and similar expenses
   ("Portfolio Expenses") that it may incur in connection with the purchases or
   sale of portfolio securities; and provided further that, IXIS Anchor
   Acquisition, LLC or its affiliates will pay or reimburse the Acquiring Fund
   for all governmental fees required in connection with the registration or
   qualification of the Merger Shares issued in connection with the
   reorganization described in this Agreement.

      b. In the event the transactions contemplated by this Agreement are not
   consummated, then IXIS Anchor Acquisition, LLC agrees that it shall bear all
   of the costs and expenses (other than Portfolio Expenses) incurred by both
   the Acquiring Fund and the Acquired Fund in connection with such
   transactions.

                                     -10-



      c. Notwithstanding any other provisions of this Agreement, if for any
   reason the transactions contemplated by this Agreement are not consummated,
   neither the Acquiring Fund nor the Acquired Fund shall be liable to the
   other for any damages resulting therefrom, including, without limitation,
   consequential damages, except as specifically set forth above.

      d. Notwithstanding any of the foregoing, costs and expenses will in any
   event be paid by the party directly incurring them if and to the extent that
   the payment by another party of such costs and expenses would result in the
   disqualification of such party as a "regulated investment company" within
   the meaning of Subchapter M of the Code.

   6. Exchange Date. Delivery of the assets of the Acquired Fund to be
transferred, assumption of the liabilities of the Acquired Fund to be assumed,
and delivery of the Merger Shares to be issued shall be made at the offices of
Natixis Asset Management Advisors, L.P., 399 Boylston Street, Boston, MA 02116,
as of the close of business on February 15, 2008, or at such other time and
date agreed to by the Acquiring Fund and the Acquired Fund, the date and time
upon which such delivery is to take place being referred to herein as the
"Exchange Date."

   7. Meeting of Shareholders; Dissolution.

      a. The Existing Trust, on behalf of the Acquired Fund, shall call a
   meeting of the Acquired Fund's shareholders to take place after the
   effective date of the Registration Statement for the purpose of considering
   the approval of this Agreement.

      b. The Acquired Fund agrees that the liquidation and dissolution of the
   Acquired Fund will be effected in the manner provided in the Agreement and
   Declaration of Trust of the Existing Trust in accordance with applicable law
   and that, after the Exchange Date, the Acquired Fund shall not conduct any
   business except in connection with its liquidation and dissolution.

      c. The Acquiring Fund shall have filed the Registration Statement with
   the Commission. Each of the Acquired Fund and the Acquiring Fund shall
   cooperate with the other, and each will furnish to the other the information
   relating to itself required by the 1933 Act, the 1934 Act and the 1940 Act
   and the rules and regulations thereunder to be set forth in the Registration
   Statement.

   8. Conditions to the Acquiring Fund's Obligations. The obligations of the
Acquiring Fund hereunder shall be subject to the following conditions:

      a. That the Acquired Fund shall have furnished to the Acquiring Fund a
   statement of the Acquired Fund's assets and liabilities, with values
   determined as provided in Section 4 of this Agreement, together with a list
   of Investments with their respective tax costs, all as of the Valuation
   Time, certified on the Acquired Fund's behalf by the President (or any Vice
   President) and Treasurer (or any Assistant Treasurer) of the Existing Trust,
   and a certificate of both such officers, dated the Exchange Date, that there
   has been no material adverse change in the financial position of the
   Acquired Fund since June 30, 2007, other than changes in the Investments and
   other assets and properties since that date or changes in the market value
   of the Investments and other assets of the

                                     -11-



   Acquired Fund, or changes due to dividends paid, and a certificate of both
   such officers representing and warranting that there are no known
   liabilities, contingent or otherwise, of the Acquired Fund required to be
   reflected on a balance sheet (including notes thereto) in accordance with
   generally accepted accounting principles as of June 30, 2007 or in the
   Acquired Fund's statement of assets and liabilities as of the Valuation Time
   that are not so reflected.

      b. That the Acquired Fund shall have furnished to the Acquiring Fund a
   statement, dated the Exchange Date, signed by the President (or any Vice
   President) and Treasurer (or any Assistant Treasurer) of the Existing Trust
   certifying that as of the Exchange Date all representations and warranties
   of the Acquired Fund made in this Agreement are true and correct in all
   material respects as if made at and as of such date and each of the Existing
   Trust and the Acquired Fund has complied with all the agreements and
   satisfied all the conditions on its part to be performed or satisfied at or
   prior to such date.

      c. That there shall not be any material litigation pending with respect
   to the matters contemplated by this Agreement.

      d. That the Acquiring Fund shall have received an opinion of Thompson
   Hine LLP, counsel to the Acquired Fund, dated the Exchange Date, to the
   effect that (i) the Existing Trust is an Ohio business trust duly formed and
   validly existing under the laws of the State of Ohio, and the Acquired Fund
   is a separate series thereof duly constituted in accordance with the
   applicable provisions of the Agreement and Declaration of Trust and By-Laws
   of the Existing Trust; (ii) this Agreement has been duly authorized,
   executed and delivered by the Existing Trust on behalf of the Acquired Fund
   and, assuming that the Registration Statement, the Acquired Fund Prospectus
   and the Acquired Fund Proxy Statement comply with the 1933 Act, the 1934 Act
   and the 1940 Act and assuming due authorization, execution and delivery of
   this Agreement by the New Trust on behalf of the Acquiring Fund, is a valid
   and binding obligation of the Existing Trust enforceable against the
   Acquired Fund in accordance with its terms, except as may be limited by
   bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium or
   other similar laws of general applicability relating to or affecting
   creditors' rights generally and other equitable principles; (iii) the
   Existing Trust, on behalf of the Acquired Fund, has power to sell, assign,
   convey, transfer and deliver the assets contemplated hereby; (iv) the
   execution and delivery of this Agreement did not, and the consummation of
   the transactions contemplated hereby will not, to the knowledge of such
   counsel, violate the Agreement and Declaration of Trust or By-Laws of the
   Existing Trust, or, to the knowledge of such counsel without having made any
   investigation, any provision of any material agreement known to such counsel
   to which the Existing Trust or the Acquired Fund is a party or by which it
   is bound or, to the knowledge of such counsel without having made any
   investigation, result in the acceleration of any obligation or the
   imposition of any penalty under any agreement, judgment or decree to which
   the Existing Trust or the Acquired Fund is party or by which either of them
   is bound; (v) to the knowledge of such counsel without having made any
   investigation, no consent, approval, authorization or order of any court or
   governmental authority is required for the consummation by the Trust on
   behalf of the Acquired Fund

                                     -12-



   of the transactions contemplated hereby, except such as have been obtained
   under the 1933 Act, the 1934 Act and the 1940 Act and such as may be
   required under state securities or "Blue Sky" laws; (vi) the Existing Trust
   is registered with the Commission as an investment company under the 1940
   Act and the Acquired Fund is duly constituted as a series thereof and, to
   the knowledge of such counsel, such registration is in full force and
   effect; and (vii) to the knowledge of such counsel, without having made any
   investigation, no litigation or administrative proceeding or investigation
   of or before any court or governmental body is presently pending or
   threatened as to the Existing Trust or the Acquired Fund or any of their
   properties or assets that challenges or seeks to prohibit, restrain or
   enjoin the transactions contemplated by this Agreement. Such opinion may
   state that such counsel does not express any opinion or belief as to the
   financial statements or other financial data, or as to the information
   relating to the Acquiring Fund, contained in the Acquired Fund Proxy
   Statement or the Registration Statement, and that such opinion is solely for
   the benefit of the Acquiring Fund, its Trustees and its officers. In
   connection with the foregoing, it is understood that counsel may rely upon
   the representations contained in this Agreement as well as certificates of
   an officer of the Existing Trust.

      e. That the Acquiring Fund shall have received an opinion of Ropes & Gray
   LLP, counsel to the Acquiring Fund, dated the Exchange Date (which opinion
   would be based upon certain factual representations and subject to certain
   qualifications), to the effect that, on the basis of the existing provisions
   of the Code, current administrative rules and court decisions, for federal
   income tax purposes: (i) the transactions contemplated by this Agreement
   will constitute a reorganization within the meaning of Section 368(a) of the
   Code, and the Acquiring Fund and the Acquired Fund will each be "a party to
   the reorganization" within the meaning of Section 368(b) of the Code;
   (ii) under Section 1032 of the Code, no gain or loss will be recognized by
   the Acquiring Fund upon receipt of the Investments transferred to the
   Acquiring Fund pursuant to this Agreement in exchange for the Merger Shares
   and the assumption by the Acquiring Fund of the liabilities of the Acquired
   Fund as contemplated in Section 3 hereof; (iii) under Section 362(b) of the
   Code, the basis to the Acquiring Fund of the Investments will be the same as
   the basis of the Investments in the hands of the Acquired Fund immediately
   prior to such exchange; (iv) under Section 1223(2) of the Code, the
   Acquiring Fund's holding periods with respect to the Investments will
   include the respective periods for which the Investments were held by the
   Acquired Fund; (v) the Acquiring Fund will succeed to and take into account
   the items of the Acquired Fund described in Section 381(c) of the Code,
   subject to the conditions and limitations specified in Sections 381, 382,
   383 and 384 of the Code and the regulations thereunder; and (vi) such other
   matters as the Acquiring Fund may deem necessary or desirable.

      f. That the assets of the Acquired Fund to be acquired by the Acquiring
   Fund will include no assets which the Acquiring Fund, by reason of
   limitations in the New Trust Declaration of Trust and By-Laws or of
   investment restrictions disclosed in the Acquiring Fund Prospectus or the
   Registration Statement as in effect on the Exchange Date, may not properly
   acquire.

                                     -13-



      g. That the Existing Trust shall have received from the Commission and
   any relevant state securities administrators such order or orders, if any,
   as are reasonably necessary or desirable under the 1933 Act, the 1934 Act,
   the 1940 Act and any applicable state securities or "Blue Sky" laws in
   connection with the transactions contemplated hereby, and that all such
   orders shall be in full force and effect.

      h. That all actions taken by the Existing Trust on behalf of the Acquired
   Fund in connection with the transactions contemplated by this Agreement and
   all documents incidental thereto shall be satisfactory in form and substance
   to the Acquiring Fund and Ropes & Gray LLP.

      i. That the Acquired Fund shall have furnished to the Acquiring Fund a
   certificate, signed by the President (or any Vice President) and the
   Treasurer (or any Assistant Treasurer) of the Existing Trust, as to the tax
   cost to the Acquired Fund of the Investments delivered to the Acquiring Fund
   pursuant to this Agreement, together with any such other evidence as to such
   tax cost as the Acquiring Fund may reasonably request.

      j. That the Acquired Fund's custodian shall have delivered to the
   Acquiring Fund a certificate identifying all of the assets of the Acquired
   Fund held or maintained by such custodian as of the Valuation Time.

      k. That the Acquired Fund's transfer agent shall have provided to the
   Acquiring Fund (i) the originals or true copies of all of the records of the
   Existing Trust attributable to the Acquired Fund in the possession of such
   transfer agent as of the Exchange Date, (ii) a certificate setting forth the
   number of shares of the Acquired Fund outstanding as of the Valuation Time,
   and (iii) the name and address of each holder of record of any shares of the
   Acquired Fund and the number of shares held of record by each such
   shareholder.

      l. That all of the issued and outstanding shares of beneficial interest
   of the Acquired Fund shall have been offered for sale and sold in conformity
   with all applicable state securities or "Blue Sky" laws (including any
   applicable exemptions therefrom) and, to the extent that any examination of
   the records of the Acquired Fund or its transfer agent by the Acquiring Fund
   or its agents shall have revealed otherwise, the Acquired Fund shall have
   taken all actions that in the opinion of the Acquiring Fund or Ropes &
   Gray LLP are necessary to remedy any prior failure on the part of the
   Acquired Fund to have offered for sale and sold such shares in conformity
   with such laws.

      m. That this Agreement shall have been adopted and the transactions
   contemplated hereby shall have been approved by the requisite votes of the
   holders of the outstanding shares of beneficial interest of the Acquired
   Fund entitled to vote.

      n. The Acquired Fund shall have timely filed all required federal and
   state income tax returns for the tax year ended December 31, 2006.

      o. That the Registration Statement shall have become effective under the
   1933 Act, and no stop order suspending such effectiveness shall have been
   instituted or, to the knowledge of the New Trust or the Acquiring Fund,
   threatened by the Commission.

                                     -14-



   9. Conditions to the Acquired Fund's Obligations. The obligations of the
Acquired Fund hereunder shall be subject to the following conditions:

      a. That the Acquiring Fund shall have furnished to the Acquired Fund a
   statement of the Acquiring Fund's net assets, together with a list of
   portfolio holdings with values determined as provided in Section 4, all as
   of the Valuation Time, certified on the Acquiring Fund's behalf by the
   President (or any Vice President) and Treasurer (or any Assistant Treasurer)
   of the New Trust, and a certificate of both such officers, dated the
   Exchange Date, to the effect that as of the Valuation Time and as of the
   Exchange Date there has been no material adverse change in the financial
   position of the Acquiring Fund since the date hereof.

      b. That the New Trust, on behalf of the Acquiring Fund, shall have
   executed and delivered to the Acquired Fund a document dated as of the
   Exchange Date, pursuant to which the Acquiring Fund will, in connection with
   the transactions contemplated by this Agreement, assume all of the known and
   unknown liabilities of the Acquired Fund existing as of the Valuation Time.

      c. That the Acquiring Fund shall have furnished to the Acquired Fund a
   statement, dated the Exchange Date, signed by the President (or any Vice
   President) and Treasurer (or any Assistant Treasurer) of the New Trust
   certifying that as of the Exchange Date all representations and warranties
   of the Acquiring Fund made in this Agreement are true and correct in all
   material respects as if made at and as of such date, and that each of the
   New Trust and the Acquiring Fund has complied with all of the agreements and
   satisfied all of the conditions on its part to be performed or satisfied at
   or prior to such date.

      d. That there shall not be any material litigation pending or threatened
   with respect to the matters contemplated by this Agreement.

      e. That the Acquired Fund shall have received an opinion of Ropes &
   Gray LLP, counsel to the Acquiring Fund, dated the Exchange Date, to the
   effect that (i) the New Trust is an unincorporated voluntary association
   with transferable shares duly formed and validly existing under the laws of
   the Commonwealth of Massachusetts (commonly known as a Massachusetts
   business trust), and the Acquiring Fund is a separate series thereof duly
   constituted in accordance with the applicable provisions of the 1940 Act and
   the Agreement and Declaration of Trust and By-Laws of the New Trust;
   (ii) this Agreement has been duly authorized, executed and delivered by the
   New Trust on behalf of the Acquiring Fund and, assuming that the Acquiring
   Fund Prospectus, the Registration Statement and the Acquired Fund Proxy
   Statement comply with the 1933 Act, the 1934 Act and the 1940 Act and
   assuming due authorization, execution and delivery of this Agreement by the
   Existing Trust on behalf of the Acquired Fund, is a valid and binding
   obligation of the New Trust, enforceable against the Acquiring Fund in
   accordance with its terms, except as the same may be limited by bankruptcy,
   insolvency,

                                     -15-



   fraudulent transfer, reorganization, moratorium or other similar laws of
   general applicability relating to or affecting creditors' rights generally
   and other equitable principles; (iii) the Merger Shares to be delivered to
   the Acquired Fund as provided for by this Agreement are duly authorized and
   upon such delivery will be validly issued and will be fully paid and, except
   as set forth below, nonassessable by New Trust and the Acquiring Fund and no
   shareholder of the Acquiring Fund has any preemptive right to subscription
   or purchase in respect thereof; (iv) the Registration Statement and all
   post-effective amendments filed with the Commission on or before the Closing
   Date, if any, has become effective under the 1933 Act, and based upon oral
   inquiries to the Commission staff on such date, no stop order suspending the
   effectiveness of the Registration Statement has been issued and no
   proceeding for any such purpose is pending or threatened by the Commission;
   (v) the execution and delivery of this Agreement did not, and the
   consummation of the transactions contemplated hereby will not, to the
   knowledge of such counsel, violate the Agreement and Declaration of Trust or
   By-Laws of the New Trust, or, to the knowledge of such counsel without
   having made any investigation, any provision of any material agreement known
   to such counsel to which the New Trust or the Acquiring Fund is a party or
   by which it is bound or, to the knowledge of such counsel without having
   made any investigation, result in the acceleration of any obligation or the
   imposition of any penalty under any agreement, judgment or decree to which
   the New Trust or the Acquiring Fund is party or by which either of them is
   bound, it being understood that with respect to investment restrictions as
   contained in the Agreement and Declaration of Trust, By-Laws or then-current
   prospectuses or statement of additional information of the New Trust, such
   counsel may rely upon a certificate of an officer of the New Trust; (vi) to
   the knowledge of such counsel without having made any investigation, no
   consent, approval, authorization or order of any court or governmental
   authority is required for the consummation by the New Trust on behalf of the
   Acquiring Fund of the transactions contemplated herein, except such as have
   been obtained under the 1933 Act, the 1934 Act and the 1940 Act and such as
   may be required under state securities or "Blue Sky" laws; (vii) the New
   Trust is registered with the Commission as an investment company under the
   1940 Act and, to the knowledge of such counsel, the Commission has not
   issued to the Acquiring Fund notice of any hearing or other proceeding to
   consider suspension or revocation of such registration; and (viii) to the
   knowledge of such counsel, without having made any investigation, no
   litigation or administrative proceeding or investigation of or before any
   court or governmental body is presently pending or threatened as to the New
   Trust or the Acquiring Fund or any of their properties or assets that
   challenges or seeks to prohibit, restrain or enjoin the transactions
   contemplated by this Agreement. Such opinion may also state that such
   counsel does not express any opinion or belief as to the financial
   statements or other financial data, or as to the information relating to the
   Acquired Fund, contained in the Acquired Fund Proxy Statement or the
   Registration Statement, and that such opinion is solely for the benefit of
   the Acquired Fund, its Trustees and its officers. In connection with the
   foregoing, it is understood that counsel may rely upon the representations
   contained in this Agreement as well as certificates of an officer of the New
   Trust, including certificates with respect to investment restrictions
   contained in the New Trust's Declaration of Trust or By-Laws or then-current
   prospectus or statement of additional information.

                                     -16-



      Such opinion may also include a statement to the following effect: The
   Acquiring Trust is an entity of the type commonly known as a "Massachusetts
   business trust." Under Massachusetts law, shareholders could, under certain
   circumstances, be held personally liable for the obligations of the
   Acquiring Trust. However, the Agreement and Declaration of Trust of the
   Acquiring Trust disclaims shareholder liability for acts or obligations of
   the Acquiring Trust and requires that a notice of such disclaimer be given
   in each note, bond, contract, instrument, certificate or undertaking made or
   issued by or on behalf of the Acquiring Trust's trustees, officers or
   otherwise. The Agreement and Declaration of Trust of the Acquiring trust
   provides that in case any shareholder or former shareholder shall be held to
   be personally liable solely by reason of his or her being or having been a
   shareholder of the Acquiring Trust or of a particular series or class and
   not because of his or her acts or omissions or for some other reason, the
   shareholder or former shareholder (or his or her heirs, executors,
   administrators or other legal representatives or, in the case of a
   corporation or other entity, its corporate or other general successor) shall
   be entitled out of the assets of the series (or attributable to the class)
   of which he or she is or was a shareholder to be held harmless from and
   indemnified against all loss and expense arising from such liability. Thus,
   the risk of a shareholder's incurring financial loss on account of
   shareholder liability is limited to circumstances in which the particular
   series of which he or she is or was a shareholder would be unable to meet
   its obligations.

      f. That the Acquired Fund shall have received an opinion of Ropes & Gray
   LLP, dated the Exchange Date (which opinion would be based upon certain
   factual representations and subject to certain qualifications), in form
   satisfactory to the Acquired Fund to the effect that, on the basis of the
   existing provisions of the Code, current administrative rules and court
   decisions, for federal income tax purposes: (i) the transactions
   contemplated by this Agreement will constitute a reorganization within the
   meaning of Section 368(a) of the Code, and the Acquiring Fund and the
   Acquired Fund will each be "a party to the reorganization" within the
   meaning of Section 368(b) of the Code; (ii) under Section 361 of the Code,
   no gain or loss will be recognized by the Acquired Fund (x) upon the
   transfer of its assets to the Acquiring Fund in exchange for the Merger
   Shares and the assumption by the Acquiring Fund of the liabilities of the
   Acquired Fund as contemplated in Section 3 hereof or (y) upon the
   distribution of the Merger Shares to the shareholders of the Acquired Fund
   as contemplated in Section 3 hereof; (iii) under Section 354 of the Code, no
   gain or loss will be recognized by shareholders of the Acquired Fund on the
   distribution of Merger Shares to them in exchange for their shares of the
   Acquired Fund; (iv) under Section 358 of the Code, the aggregate tax basis
   of the Merger Shares that the Acquired Fund's shareholders receive in place
   of their Acquired Fund shares will be the same as the aggregate tax basis of
   the Acquired Fund shares surrendered in exchange therefor; and (v) under
   Section 1223(1) of the Code, an Acquired Fund's shareholder's holding period
   for the Merger Shares received pursuant to the Agreement will be determined
   by including the holding period for the Acquired Fund shares exchanged for
   the Merger Shares, provided that the shareholder held the Acquired Fund
   shares as a capital asset.

      g. That all actions taken by the New Trust on behalf of the Acquiring
   Fund in connection with the transactions contemplated by this Agreement and
   all documents incidental thereto shall be satisfactory in form and substance
   to the Acquired Fund and Thompson Hine LLP.

                                     -17-



      h. That the New Trust shall have received from the Commission and any
   relevant state securities administrator such order or orders as are
   reasonably necessary or desirable under the 1933 Act, the 1934 Act, the 1940
   Act and any applicable state securities or "Blue Sky" laws in connection
   with the transactions contemplated hereby, and that all such orders shall be
   in full force and effect.

      i. That this Agreement shall have been adopted and the transactions
   contemplated hereby shall have been approved by the requisite votes of the
   holders of the outstanding shares of beneficial interest of the Acquired
   Fund entitled to vote.

      j. That the Registration Statement on Form N-1A of the New Trust, with
   respect to the Acquiring Fund, shall have become effective under the 1933
   Act, and no stop order suspending such effectiveness shall have been
   instituted or, to the knowledge of the New Trust or the Acquiring Fund,
   threatened by the Commission.

      k. That the New Trust shall have included in its Declaration of Trust or
   By-Laws provisions that indemnify, solely out of assets of the Acquiring
   Fund and no other assets, the trustees and officers of the Existing Trust on
   the Exchange Date, and all prior trustees and officers of the Existing
   Trust, against claims that may be made against such trustees and officers of
   the Existing Trust in their capacity as such trustees or officers, with such
   provisions to be substantially similar in form and substance to the
   provisions under which the trustees and officers of the New Trust are
   indemnified.

      l. That there shall have been (i) obtained on behalf of the Acquiring
   Fund "tail" liability insurance with the aggregate coverage amount of
   $10,000,000 and a retention amount of $150,000 per claim ($0 for the
   trustees) covering claims that may be made against the trustees and the
   officers of the Existing Trust in their capacity as such trustees or
   officers for a period of six years following the Exchange Date and
   (ii) obtained on behalf of the Acquiring Fund "tail" liability insurance
   with an aggregate coverage amount of $5,000,000 covering claims that may be
   made against the independent trustees of the Existing Trust in their
   capacity as such independent trustees for a period of six years following
   the Exchange Date. By countersigning this Agreement, IXIS Anchor
   Acquisition, LLC (to be renamed Gateway Investment Advisers, LLC as of 4:01
   p.m. on February 15, 2008) agrees that it, and not the New Trust, will pay
   or cause to be paid the premiums incurred in connection with the "tail"
   insurance referred to in clauses (i) and (ii) above.

   10. Existing Trust Trustee and Officer Indemnification and Insurance. The
New Trust agrees to (i) take such steps as are necessary to ensure that the
provisions in its Declaration and Trust and By-Laws referred to in clause
(i) of Section 9(k) hereof remain in full force and effect, to the maximum
extent permitted by applicable law, and (ii) for a period of six years after
the Exchange Date, maintain the "tail" insurance referred to in clause (ii) of
Section 9(l) hereof.

                                     -18-



   11. Certain Tax Returns. The Existing Trust and the New Trust hereby agree
that the federal tax returns for the tax year ended December 31, 2008,
consistent with a reorganization pursuant to Section 368(a)(1)(F) of the Code,
will be a single return based on the operations of the Acquired Fund from
January 1, 2008 through the Exchange Date and the operations of the Acquiring
Fund from the Exchange Date through December 31, 2008.

   12. Indemnification.

      a. The Acquired Fund shall indemnify and hold harmless, out of the assets
   of the Acquired Fund but no other assets, the New Trust and the Trustees and
   officers of the New Trust (for purposes of this Section 12(a), the "New
   Trust Indemnified Parties") against any and all expenses, losses, claims,
   damages and liabilities at any time imposed upon or reasonably incurred by
   any one or more of the New Trust Indemnified Parties in connection with,
   arising out of or resulting from any claim, action, suit or proceeding in
   which any one or more of the New Trust Indemnified Parties may be involved
   or with which any one or more of the New Trust Indemnified Parties may be
   threatened by reason of any breach of any representation or warranty of the
   Acquired Fund contained in this Agreement or untrue statement or alleged
   untrue statement of a material fact contained in the Acquired Fund
   Prospectus, or, to the extent based on or derived from the Acquired Fund
   Prospectus or other documents provided by the Acquired Fund, contained in
   the Registration Statement or the Acquired Fund Proxy Statement or any
   amendment or supplement to any of the foregoing, or arising out of or based
   upon the omission or alleged omission to state in any of the foregoing a
   material fact relating to the Existing Trust or the Acquired Fund required
   to be stated therein or necessary to make the statements relating to the
   Existing Trust or the Acquired Fund therein not misleading, including,
   without limitation, any amounts paid by any one or more of the New Trust
   Indemnified Parties in a reasonable compromise or settlement of any such
   claim, action, suit or proceeding, or threatened claim, action, suit or
   proceeding made with the consent of the Existing Trust or the Acquired Fund.
   The New Trust Indemnified Parties will notify the Existing Trust and the
   Acquired Fund in writing within ten days after the receipt by any one or
   more of the New Trust Indemnified Parties of any notice of legal process or
   any suit brought against or claim made against such New Trust Indemnified
   Party as to any matters covered by this Section 12(a). The Acquired Fund
   shall be entitled to participate at its own expense in the defense of any
   claim, action, suit or proceeding covered by this Section 12(a), or, if it
   so elects, to assume at its expense by counsel satisfactory to the New Trust
   Indemnified Parties the defense of any such claim, action, suit or
   proceeding, and if the Acquired Fund elects to assume such defense, the New
   Trust Indemnified Parties shall be entitled to participate in the defense of
   any such claim, action, suit or proceeding at their expense. The Acquired
   Fund's obligation under this Section 12(a) to indemnify and hold harmless
   the New Trust Indemnified Parties shall constitute a guarantee of payment so
   that the Acquired Fund will pay in the first instance any expenses, losses,
   claims, damages and liabilities required to be paid by it under this
   Section 12(a) without the necessity of the New Trust Indemnified Parties'
   first paying the same.

                                     -19-



      b. The Acquiring Fund shall indemnify and hold harmless, out of the
   assets of the Acquiring Fund but no other assets, the Existing Trust and the
   Trustees and officers of the Existing Trust (for purposes of this
   Section 12(b), the "Existing Trust Indemnified Parties") against any and all
   expenses, losses, claims, damages and liabilities at any time imposed upon
   or reasonably incurred by any one or more of the Existing Trust Indemnified
   Parties in connection with, arising out of, or resulting from any claim,
   action, suit or proceeding in which any one or more of the Existing Trust
   Indemnified Parties may be involved or with which any one or more of the
   Existing Trust Indemnified Parties may be threatened by reason of any breach
   of any representation or warranty of the Acquiring Fund contained in this
   Agreement or untrue statement or alleged untrue statement of a material fact
   (except to the extent based on or derived from the Acquired Fund Prospectus
   or other documents provided by the Acquired Fund) contained in the
   Registration Statement, the Acquiring Fund Prospectus or the Acquired Fund
   Proxy Statement or any amendment or supplement to any thereof, or arising
   out of, or based upon, the omission or alleged omission to state in any of
   the foregoing a material fact required to be stated therein or necessary to
   make the statements therein not misleading, including, without limitation,
   any amounts paid by any one or more of the Trust Indemnified Parties in a
   reasonable compromise or settlement of any such claim, action, suit or
   proceeding, or threatened claim, action, suit or proceeding made with the
   consent of the New Trust or the Acquiring Fund. The Existing Trust
   Indemnified Parties will notify the New Trust and the Acquiring Fund in
   writing within ten days after the receipt by any one or more of the Existing
   Trust Indemnified Parties of any notice of legal process or any suit brought
   against or claim made against such Trust Indemnified Party as to any matters
   covered by this Section 12(b). The Acquiring Fund shall be entitled to
   participate at its own expense in the defense of any claim, action, suit or
   proceeding covered by this Section 12(b), or, if it so elects, to assume at
   its expense by counsel satisfactory to the Existing Trust Indemnified
   Parties the defense of any such claim, action, suit or proceeding, and, if
   the Acquiring Fund elects to assume such defense, the Existing Trust
   Indemnified Parties shall be entitled to participate in the defense of any
   such claim, action, suit or proceeding at their own expense. The Acquiring
   Fund's obligation under this Section 12(b) to indemnify and hold harmless
   the Trust Indemnified Parties shall constitute a guarantee of payment so
   that the Acquiring Fund will pay in the first instance any expenses, losses,
   claims, damages and liabilities required to be paid by it under this
   Section 12(b) without the necessity of the Trust Indemnified Parties' first
   paying the same.

   13. No Broker, etc. Each of the Acquired Fund and the Acquiring Fund
represents that there is no person who has dealt with it or the Existing Trust
or the New Trust, respectively, who, by reason of such dealings, is entitled to
any broker's or finder's or other similar fee or commission payable by either
the Existing Trust or the New Trust arising out of the transactions
contemplated by this Agreement.

   14. Termination. The Acquired Fund and the Acquiring Fund may, by mutual
consent of a majority of the trustees of Existing Trust and a majority of the
trustees of New Trust terminate this Agreement, and the Acquired Fund or the
Acquiring Fund, after consultation with counsel and by consent of its Trustees
or an officer authorized by such Trustees, may waive any condition to its
respective obligations hereunder. If the transactions contemplated by this
Agreement have not been substantially completed by March 31, 2008, this
Agreement shall automatically terminate on that date unless a later date is
agreed to by the Acquired Fund and the Acquiring Fund.

                                     -20-



   15. Covenants, etc. Deemed Material. All covenants, agreements,
representations and warranties made under this Agreement and any certificates
delivered pursuant to this Agreement shall be deemed to have been material and
relied upon by each of the parties, notwithstanding any investigation made by
them or on their behalf.

   16. Rule 145. Pursuant to Rule 145 under the 1933 Act, the Acquiring Fund
will, in connection with the issuance of any Merger Shares to any person who at
the time of the transaction contemplated hereby is deemed to be an affiliate of
a party to the transaction pursuant to Rule 145(c), cause to be affixed upon
the certificates issued to such person (if any) such legends as may be
reasonably believed by counsel to the Acquiring Fund to be required by law and,
further, the Acquiring Fund will issue stop transfer instructions to the
Acquiring Fund's transfer agent with respect to such shares. The Acquired Fund
will provide the Acquiring Fund on the Exchange Date with the name of any
Acquired Fund shareholder who is to the knowledge of the Acquired Fund an
affiliate of the Acquired Fund on such date.

   17. Sole Agreement; Amendments; Governing Law. This Agreement supersedes all
previous correspondence and oral communications between the parties regarding
the subject matter hereof, constitutes the only understanding with respect to
such subject matter, may not be changed except by a letter of agreement signed
by each party hereto (except that amendments to provisions other than those in
Section 5 hereof shall not require the signature of Gateway Investment
Advisers, L.P.), and shall be construed in accordance with and governed by the
laws of the Commonwealth of Massachusetts.

   18. Waiver. At any time on or prior to the Exchange Date, the Acquired Fund
or the Acquiring Fund, after consultation with counsel and by consent of its
trustees or an officer authorized by such trustees, may waive any condition to
its respective obligations hereunder.

   19. Assignment. This Agreement shall be binding upon and inure to the
benefit of the parties hereto and their respective successors and assigns, but
no assignment or transfer hereof or of any rights or obligations hereunder
shall be made by either party without the written consent of the other party.
Nothing herein expressed or implied is intended or shall be construed to confer
upon or give any person other than the parties hereto and their respective
successors and assigns any rights or remedies under or by reason of this
Agreement.

   20. Notices. Any notice, report, statement or demand required or permitted
by any provisions of this Agreement shall be in writing and shall be given by
facsimile, courier or certified mail addressed to the Existing Trust at
Rookwood Tower, Suite 600, 3805 Edwards Road, Cincinnati, Ohio 45209 (fax:
513-719-1199) and to the New Trust at 399 Boylston Street, 6th Floor, Boston,
Massachusetts 02116 (fax: 617-449-2880).

   21. Recourse. All persons dealing with the Acquiring Fund or the Acquired
Fund must look solely to the property of such Fund for the enforcement of any
claims against such Fund, as neither the trustees, directors, officers, agents
nor shareholders of the Funds or other series of the respective Trusts assume
any liability for obligations entered into on behalf of any of the Funds.

                                     -21-



   22. Headings. The section headings contained in this Agreement are for
reference purposes only and shall not affect in any way the meaning or
interpretation of this Agreement.

   23. Counterparts. This Agreement may be executed in any number of
counterparts, each of which shall be deemed an original.

   24. Plan of Reorganization. The parties hereby agree that the Plan of
Reorganization for the transactions contemplated hereby is as set forth on the
first page of this agreement.

   25. Declaration of Trust.

      a. A copy of the Agreement and Declaration of Trust of the New Trust is
   on file with the Secretary of the Commonwealth of Massachusetts, and notice
   is hereby given that this instrument is executed on behalf of the Trustees
   of the New Trust on behalf of the Acquiring Fund as trustees and not
   individually, and that the obligations of this instrument are not binding
   upon any of the trustees, officers or shareholders of the New Trust
   individually but are binding only upon the assets and property of the
   Acquiring Fund.

      b. It is expressly agreed that the obligations of the Acquired Fund
   hereunder shall not be binding upon any of the Trustees, shareholders,
   nominees, officers, agents or employees of the Existing Trust personally,
   but shall bind only the trust property of the Acquired Fund, as provided in
   the Agreement and Declaration of Trust of the Acquired Fund. The execution
   and delivery of this Agreement has been authorized by the Trustees of the
   Gateway Trust on behalf of the Acquired Fund and signed by an authorized
   officer of the Existing Trust, acting as such. Such authorization by such
   Trustees and such execution and delivery by such officer shall not been
   deemed to have been made by any of them individually or to impose any
   liability on any of them personally, but shall bind only the trust property
   of the Acquired Fund as provided in the Existing Trust's Agreement and
   Declaration of Trust.

                               *    *    *    *

                                     -22-



   IN WITNESS WHEREOF, each of the parties hereto has caused this Agreement to
be executed as a sealed instrument as of the day and year first above written.

                                           THE GATEWAY TRUST,
                                           on behalf of its Gateway Fund

                                           By:    /s/ Walter G. Sall
                                                  ------------------------------
                                           Name:  Walter G. Sall
                                           Title: Chairman

                                           GATEWAY TRUST,
                                           on behalf of its Gateway Fund

                                           By:    /s/ John T. Hailer
                                                  ------------------------------
                                           Name:  John T. Hailer
                                           Title: President

Agreed and accepted as to Sections 5 and 9(l) only
IXIS ANCHOR ACQUISITION, LLC, to be renamed
GATEWAY INVESTMENT ADVISERS, LLC
as of 4:01 p.m. on February 15, 2008


By:    /s/ Eric N. Ward
       ------------------------------
Name:  Eric N. Ward
Title: Authorized Person

           [SIGNATURE PAGE TO AGREEMENT AND PLAN OF REORGANIZATION]

                                     -23-