Gateway Trust

07/01/2026 | Press release | Distributed by Public on 07/01/2026 13:36

Prospectus by Investment Company (Form 497)

Supplement dated July 1, 2026 to the Loomis Sayles Funds Statements of Additional Information, dated February 1, 2026, May 1, 2026, and May 7, 2026, and the Natixis Funds Statements of Additional Information, dated February 1, 2026, April 1, 2026, May 1, 2026, and June 1, 2026, and the Natixis ETFs Statements of Additional Information, dated May 1, 2026, and June 22, 2026, as may be revised or supplemented from time to time, for the following funds:

AEW Global Focused Real Estate Fund

Loomis Sayles Securitized Asset Fund

Gateway Fund

Loomis Sayles Senior Floating Rate and Fixed Income Fund

Gateway Equity Call Premium Fund

Loomis Sayles Small Cap Growth Fund

Loomis Sayles Core Plus Bond Fund

Loomis Sayles Small Cap Value Fund

Loomis Sayles Credit Income Opportunities Fund

Loomis Sayles Small/Mid Cap Growth Fund

Loomis Sayles Fixed Income Fund

Loomis Sayles Strategic Alpha Fund

Loomis Sayles Global Allocation Fund

Loomis Sayles Strategic Income Fund

Loomis Sayles Global Bond Fund

Mirova Global Megatrends Fund

Loomis Sayles Global Growth Fund

Natixis Gateway Quality Income ETF

Loomis Sayles Growth Fund

Natixis Loomis Sayles Dynamic Core Plus ETF

Loomis Sayles High Income Fund

Natixis Loomis Sayles Focused Growth ETF

Loomis Sayles High Income Opportunities Fund

Natixis Loomis Sayles Total Return Bond ETF

Loomis Sayles Income Fund

Natixis Oakmark Fund

Loomis Sayles Inflation Protected Securities Fund

Natixis Oakmark International Fund

Loomis Sayles Institutional High Income Fund

Natixis U.S. Equity Opportunities Fund

Loomis Sayles Intermediate Duration Bond Fund

Natixis Vaughan Nelson Select ETF

Loomis Sayles International Growth Fund

Vaughan Nelson Mid Cap Fund

Loomis Sayles Investment Grade Bond Fund

Vaughan Nelson Select Fund

Loomis Sayles Investment Grade Fixed Income Fund

Vaughan Nelson Small Cap Fund

Loomis Sayles Limited Term Government and Agency Fund

Effective July 1, 2026, the table in the sub-section "Trustees and Officers" within the section "Management of the Trust(s)" of the Statement of Additional Information (the "SAI"), is hereby updated to reflect the addition of the new trustees below. In addition, the list of the members of the Audit Committee, Contract Review Committee and Governance Committee in the sub-section "Leadership and Structure of the Board" within the section "Management of the Trust(s)" of the SAI is hereby replaced with the following:

Name and Year

of Birth

Position(s)

Held with

the Trust,

Length of

Time Served

and

Term of

Office1

Principal

Occupation(s)

During

Past 5 Years

Number of

Portfolios in

Fund Complex

Overseen2

and Other

Directorships

Held During

Past 5 Years

Experience,

Qualifications,

Attributes, Skills

for Board

Membership

Morris W. Applewhite

(1958)

Trustee since 2026

Audit Committee Member

Retired; formerly, National Head of Corporate Engagement, Year Up United (workforce development nonprofit)

39

Board Member, Boys and Girls Club of America (youth development nonprofit); formerly, Independent Director, Credit Suisse Holdings and Credit Suisse Securities LLC (financial services)

Significant experience on the boards of business organizations; financial services industry experience (including service as an independent director of financial services entities); executive experience overseeing complex business operations (including senior leadership roles at multinational business services companies)

Amy Whitelaw

(1971)

Trustee since 2026

Contract Review Committee Member

Retired; formerly, Head of Equity Index Portfolio Management, BlackRock (financial services); Head of U.S. iShares Portfolio Management, BlackRock (financial services) 39 Financial services industry and executive experience (including leadership roles in index portfolio management and asset allocation at a global investment management firm)
1

Each Trustee serves until retirement, resignation or removal from the Board. The current retirement age is 75. The position of Chairperson of the Board is appointed for a three-year term.

2

The Trustees of the Trust serve as Trustees of a fund complex that includes all series of the Natixis Funds Trust I, Natixis Funds Trust II, Natixis Funds Trust IV and Gateway Trust (collectively, the "Natixis Funds Trusts"), Loomis Sayles Funds I and Loomis Sayles Funds II, Loomis Sayles Credit Income Opportunities Fund (collectively, the "Loomis Sayles Funds Trusts"), and Natixis ETF Trust and Natixis ETF Trust II (collectively, the "Natixis ETF Trusts") (collectively, the "Fund Complex").

Audit Committee

Contract Review Committee

Governance Committee

Richard A. Goglia - Chairperson

Kirk A. Sykes - Chairperson James P. Palermo - Chairperson

Morris W. Applewhite

Edmond J. English Edmond J. English

James P. Palermo

Martin T. Meehan Martin T. Meehan

Cynthia L. Walker

Maureen B. Mitchell Cynthia L. Walker
Amy Whitelaw

As Chairperson of the Board, Mr. Sirri is an ex officio member of each Committee.

Effective June 29, 2026, Susan Tobin has resigned as Chief Compliance Officer and Anti-Money Laundering Officer of the Trusts. Ms. Tobin will continue to serve as Secretary, Clerk, and Chief Legal Officer of the Trusts. Accordingly, effective immediately, all references to Ms. Tobin as Chief Compliance Officer and Anti-Money Laundering Officer of the Trusts are removed from each SAI.

Effective June 29, 2026, Jennifer Cassedy has been appointed as Chief Compliance Officer, Assistant Secretary and Anti-Money Laundering Officer of the Trusts. Accordingly, the "Officers of the Trust(s)" table located in the sub-section "Trustees and Officers" within the section "Management of the Trust(s)" in each SAI is hereby amended to include the following:

Name and

Year of Birth

Position(s) Held

with the Trust(s)

Term of Office1

and Length of Time Served

Principal Occupation(s) During Past 5 Years2

OFFICERS OF THE TRUST

Jennifer Cassedy

(1971)

Chief Compliance Officer, Assistant Secretary and Anti-Money Laundering Officer Since June 2026 Senior Vice President, Natixis Advisors, LLC and Natixis Distribution, LLC; formerly, Vice President, Asset Management Compliance, Fidelity Investments
1

Each officer of the Trust serves for an indefinite term in accordance with the Trust's current by-laws until the date his or her successor is elected and qualified, or until he or she sooner dies, retires, is removed or becomes disqualified.

2

Each person listed above, except as noted, holds the same position(s) with the Fund Complex. Previous positions during the past five years with Natixis Distribution, L.P., Natixis Advisors, L.P. or Loomis, Sayles & Company, L.P. are omitted, if not materially different from a Trustee's or officer's current position with such entity.

Gateway Trust published this content on July 01, 2026, and is solely responsible for the information contained herein. Distributed via EDGAR on July 01, 2026 at 19:36 UTC. If you believe the information included in the content is inaccurate or outdated and requires editing or removal, please contact us at [email protected]