Prospectus by Investment Company - Form 497

Gateway Trust

Supplement dated October 18, 2024 to the Statement of Additional Information, dated May 1, 2024, as may be revised or supplemented from time to time, for the following funds:

Gateway Equity Call Premium Fund

Gateway Fund

Mirova Global Green Bond Fund

Mirova Global Sustainable Equity Fund

Mirova International Sustainable Equity Fund

Vaughan Nelson Mid Cap Fund

Vaughan Nelson Small Cap Value Fund

Effective immediately, the information for Confluence Technologies, Inc., Gresham Technologies plc and NIM-os LLC in the table under the third paragraph in the section "Portfolio Holdings Information" is amended and restated as follows:

Entity		Fund(s)		Holdings		Frequency		Purpose
Confluence Technologies, Inc.		All Funds		Full portfolio holdings		Quarterly, or more frequently as needed		Performing certain functions related to quarterly Form N-PORT filings and production of shareholder reports
Gresham Technologies plc		All Funds		Full portfolio holdings		Daily		Performing certain electronic reconciliations of portfolio holdings of the Funds
NIM-os, LLC		Certain Funds		Full portfolio holdings		Daily		Hosting of portfolio accounting and trade order management and compliance systems, corporate actions, trade settlements, pricing, reconciliation, and risk analysis

Public link

Please use the above public link if you want to share this noodl on another website.