Exhibit (h)(4)(iv)

June 9, 2017

Natixis Funds Trust I

Natixis Funds Trust II

Natixis Funds Trust IV

Gateway Trust

Loomis Sayles Funds I

Loomis Sayles Funds II

399 Boylston Street

Boston, MA 02116

Re: Reimbursement of Class N Transfer Agency Fees

Ladies and Gentlemen:

NGAM Advisors, L.P. notifies you that it will reimburse the Class N shares of the following Funds for any and all transfer agency expenses attributable to accounts admitted to Class N via a prospectus provision that allows NGAM Distribution, L.P., at its sole discretion, to waive the investment minimum for accounts as to which the relevant financial intermediary has provided assurances, in writing, that the accounts will be held in omnibus fashion beginning no more than two years following the establishment date of such accounts in Class N. Such reimbursement will be in effect during the period June 9, 2017 to June 30, 2019.

Fund Name

AEW Real Estate Fund

ASG Global Alternatives Fund

ASG Managed Futures Strategy Fund

Gateway Equity Call Premium Fund

Gateway Fund

Loomis Sayles Bond Fund

Loomis Sayles Core Plus Bond Fund

Loomis Sayles Dividend Income Fund

Loomis Sayles Global Bond Fund

Loomis Sayles Global Equity and Income Fund

Loomis Sayles Global Growth Fund

Loomis Sayles Growth Fund

Loomis Sayles High Income Fund

Loomis Sayles Inflation Protected Securities Fund

Loomis Sayles Investment Grade Bond Fund

Loomis Sayles Limited Term Government and Agency Fund

Loomis Sayles Multi-Asset Income Fund

Loomis Sayles Senior Floating Rate and Fixed Income Fund

Loomis Sayles Small Cap Growth Fund

Loomis Sayles Small Cap Value Fund

Loomis Sayles Strategic Alpha Fund

Loomis Sayles Strategic Income Fund

Fund Name

Loomis Sayles Value Fund

Mirova Global Green Bond Fund

Mirova Global Sustainable Equity Fund

Natixis Oakmark Fund

Natixis Oakmark International Fund

Natixis Sustainable Future 2015 Fund

Natixis Sustainable Future 2020 Fund

Natixis Sustainable Future 2025 Fund

Natixis Sustainable Future 2030 Fund

Natixis Sustainable Future 2035 Fund

Natixis Sustainable Future 2040 Fund

Natixis Sustainable Future 2045 Fund

Natixis Sustainable Future 2050 Fund

Natixis Sustainable Future 2055 Fund

Natixis Sustainable Future 2060 Fund

Natixis U.S. Equity Opportunities Fund

Vaughan Nelson Select Fund

Vaughan Nelson Small Cap Value Fund

Vaughan Nelson Value Opportunity Fund

During the period covered by this agreement, the expense reimbursement arrangement set forth above for each of the Funds may only be modified by a majority vote of the “non-interested” Trustees of the Trust affected

We understand and intend that you will rely on this undertaking in preparing and filing the Registration Statements on Form N-1A for the Funds with the Securities and Exchange Commission, in accruing the Funds’ expenses for purposes of calculating each Fund’s net asset value per share, and for other purposes permitted under Form N-1A and/or the Investment Company Act of 1940, as amended, and expressly permit you to do so.

NGAM Advisors, L.P.
By NGAM Distribution Corporation,           its general partner
	By:	/s/ Russell Kane
	Name:	Russell Kane
	Title:	Executive Vice President, General Counsel, Secretary and Clerk