NATIXIS FUNDS

Supplement dated February 28, 2019 to the Natixis Funds Prospectuses, dated February 1, 2019, April 1, 2018, May 1, 2018 and December 28, 2018 as may be revised or supplemented from time to time, for the following funds:

AEW Real Estate Fund ASG Dynamic Allocation Fund	Loomis Sayles Senior Floating Rate and Fixed Income Fund
ASG Global Alternatives Fund	Loomis Sayles Multi-Asset Income Fund
ASG Managed Futures Strategy Fund	Loomis Sayles Strategic Alpha Fund
ASG Tactical U.S. Market Fund	Loomis Sayles Strategic Income Fund
Gateway Equity Call Premium Fund	McDonnell Intermediate Municipal Bond Fund
Gateway Fund	Mirova Global Green Bond Fund
Loomis Sayles Core Plus Bond Fund	Mirova Global Sustainable Equity Fund
Loomis Sayles Global Allocation Fund	Mirova International Sustainable Equity Fund
Loomis Sayles Global Growth Fund	Natixis Oakmark Fund
Loomis Sayles Growth Fund	Natixis Oakmark International Fund
Loomis Sayles High Income Fund	Natixis U.S. Equity Opportunities Fund
Loomis Sayles Intermediate Duration Bond Fund	Vaughan Nelson Select Fund
Loomis Sayles Investment Grade Bond Fund	Vaughan Nelson Small Cap Value Fund
Loomis Sayles Limited Term Government and Agency Fund	Vaughan Nelson Value Opportunity Fund

Effective March 1, 2019, the following information is added to Appendix A to each Prospectus:

Raymond James & Associates, Inc., Raymond James Financial Services, Inc., & Raymond James affiliates (“Raymond James”)

Effective March 1, 2019, shareholders purchasing Fund shares through a Raymond James platform or account will be eligible only for the following load waivers (front-end sales charge waivers and contingent deferred, or back-end, sales charge waivers) and discounts, which may differ from those disclosed elsewhere in this Fund’s prospectus or SAI.

Front-End Sales Load Waivers on Class A Shares available at Raymond James

• Shares purchased in an investment advisory program

• Shares purchased through reinvestment of capital gains distributions and dividend reinvestment when purchasing shares of the same fund (but not any other fund within the fund family)

• Employees and registered representatives of Raymond James or its affiliates and their family members as designated by Raymond James

• Shares purchased from the proceeds of redemptions within the same fund family, provided (1) the repurchase occurs within 90 days following the redemption, (2) the redemption and purchase occurs in the same account, and (3) redeemed shares were subject to a front-end or deferred sales load (known as Rights of Reinstatement)

• A shareholder in the Fund’s Class C shares will have their shares converted at net asset value to Class A shares (or the appropriate share class) of the Fund if the shares are no longer subject to a CDSC and the conversion is in line with the policies and procedures of Raymond James

CDSC Waivers on Classes A and C Shares available at Raymond James

• Death or disability of the shareholder

• Shares sold as part of a systematic withdrawal plan as described in the Fund’s prospectus

• Return of excess contributions from an IRA account

• Shares sold as part of a required minimum distribution for IRA and retirement accounts due to the shareholder reaching age 70¹⁄₂ as described in the Fund’s prospectus

• Shares sold to pay Raymond James fees but only if the transaction is initiated by Raymond James

• Shares acquired through a right of reinstatement

Front-End Load Discounts Available at Raymond James: Breakpoints and/or Rights of Accumulation

• Breakpoints as described in this prospectus

• Rights of accumulation which entitle shareholders to breakpoint discounts will be automatically calculated based on the aggregated holding of fund family assets held by accounts within the purchaser’s household at Raymond James. Eligible fund family assets not held at Raymond James may be included in the rights of accumulation calculation only if the shareholder notifies his or her financial advisor about such assets