Exhibit (13)(j)

                              SIXTH AMENDMENT TO
                       ADMINISTRATIVE SERVICES AGREEMENT

   This Amendment made as of February 19, 2008, by and between Natixis Asset
Management Advisors, L.P. ("Natixis Advisors") (formerly IXIS Asset Management
Advisors, L.P.) and Gateway Trust, a Massachusetts business trust (the "Gateway
Trust").

   WHEREAS, Natixis Advisors and Natixis Funds Trust I, Natixis Funds Trust II,
Natixis Funds Trust III, Natixis Funds Trust IV, Natixis Cash Management Trust,
Loomis Sayles Funds I, Loomis Sayles Funds II and Hansberger International
Series (collectively, the "Trusts") are parties to an Administrative Services
Agreement dated January 3, 2005, as amended November 1, 2005, January 1,
2006, July 1, 2007, September 17, 2007 and February 1, 2008 (together with the
amendments, the "Agreement"), governing the terms and conditions under which
Natixis Advisors provides certain administrative services to the series of the
Trusts; and

   WHEREAS, the Gateway Trust is registered as an open-end management
investment company under the Investment Company Act of 1940, as amended (the
"1940 Act"); and

   WHEREAS, the Gateway Trust desires to employ Natixis Advisors to provide
certain administrative services to the Gateway Trust in the manner and on the
terms set forth in the Agreement and Natixis Advisors wishes to perform such
services; and

   WHEREAS, Natixis Advisors and the Gateway Trust desire to amend Schedule A
of the Agreement to reflect the addition of the Gateway Trust;

   NOW THEREFORE, in consideration of the premises and covenants contained
herein, Natixis Advisors and the Gateway Trust hereby agree as follows:

1. Schedule A of the Agreement is deleted in its entirety and replaced with
   Schedule A attached hereto.

2. Except as specifically superseded or modified herein, the terms and
   provisions of the Agreement shall continue to apply with full force and
   effect.

3. This Amendment may be executed in one or more counterparts, each of which
   shall be deemed an original but all of which together will constitute one
   and the same instrument.

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   IN WITNESS WHEREOF, each of the parties has caused this instrument to be
executed as a sealed instrument in its name and behalf by its duly authorized
representative as of the date first above written.

NATIXIS ASSET MANAGEMENT ADVISORS,L.P.

By Natixis Distribution Corporation,
its generalpartner

By: /s/ John T. Hailer
    ------------------------------------
    John T. Hailer, President and Chief
    Executive Officer
GATEWAY TRUST

By: /s/ John T. Hailer
    ------------------------------------
    John T. Hailer, President

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                                                                     Schedule A
                               Trust Portfolios
                           As of: February 19, 2008

Natixis Funds Trust I
CGM Advisor Targeted Equity Fund
Hansberger International Fund
Natixis Income Diversified Portfolio
Natixis U.S. Diversified Portfolio
Loomis Sayles Core Plus Bond Fund
Vaughan Nelson Small Cap Value Fund
Westpeak 130/30 Growth Fund

Natixis Funds Trust II
Harris Associates Large Cap Value Fund
Loomis Sayles Massachusetts Tax Free Income Fund

Natixis Funds Trust III
Harris Associates Focused Value Fund
Natixis Moderate Diversified Portfolio

Natixis Funds Trust IV
AEW Real Estate Fund

Natixis Cash Management Trust
Natixis Cash Management Trust - Money Market Series

Loomis Sayles Funds I
Loomis Sayles Bond Fund
Loomis Sayles Fixed Income Fund
Loomis Sayles Global Bond Fund
Loomis Sayles High Income Opportunities Fund*
Loomis Sayles Inflation Protected Securities Fund
Loomis Sayles Institutional High Income Fund
Loomis Sayles Intermediate Duration Fixed Income Fund
Loomis Sayles Investment Grade Fixed Income Fund
Loomis Sayles Securitized Asset Fund*
Loomis Sayles Small Cap Value Fund

* With respect to these Funds only, paragraph 3 of the Agreement is revised to
  provide that Natixis Advisors shall be entitled to reasonable compensation
  for its services and expenses as Administrator, but Loomis, Sayles & Company,
  L.P. ("Loomis Sayles), the adviser to the Funds, and not Loomis Sayles Funds
  I, shall be responsible for payment of such compensation and expenses
  relating to the Funds, as agreed upon by Loomis Sayles in separate Letter
  Agreements dated January 3, 2005 and July 1, 2005, respectively.

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Loomis Sayles Funds II
Loomis Sayles Mid Cap Growth Fund
Loomis Sayles Growth Fund
Loomis Sayles High Income Fund
Loomis Sayles Investment Grade Bond Fund
Loomis Sayles International Bond Fund
Loomis Sayles Limited Term Government and Agency Fund
Loomis Sayles Municipal Income Fund
Loomis Sayles Research Fund
Loomis Sayles Small Cap Growth Fund
Loomis Sayles Strategic Income Fund
Loomis Sayles Tax-Managed Equity Fund
Loomis Sayles Value Fund
Loomis Sayles Global Markets Fund

Hansberger International Series
Hansberger Emerging Markets Fund
Hansberger International Value Fund
Hansberger International Growth Fund
Hansberger International Core Fund
Hansberger All Countries Fund (not operational)

Gateway Trust
Gateway Fund

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