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AMG Funds III

10/21/2025 | Press release | Distributed by Public on 10/21/2025 06:53

Prospectus by Investment Company (Form 497)

Filed pursuant to Rule 497(e)

File Nos. 002-84012 and 811-03752

AMG FUNDS III

AMG GW&K ESG Bond Fund

Supplement dated October 21, 2025 to the Prospectus and Statement of Additional Information, each dated May 1, 2025, as supplemented July 1, 2025

The following information supplements and supersedes any information to the contrary relating to AMG GW&K ESG Bond Fund (the "Fund"), a series of AMG Funds III (the "Trust"), contained in the Fund's Prospectus (the "Prospectus") and Statement of Additional Information (the "SAI"), dated and supplemented as noted above.

Effective as of September 30, 2026, Mary F. Kane will retire from GW&K Investment Management, LLC, the Fund's subadviser, and will no longer serve as a portfolio manager of the Fund. Effective upon Ms. Kane's retirement, Brett Kozlowski will serve as the portfolio manager primarily responsible for the day-to-day management of the Fund. Accordingly, as of September 30, 2026, all references to and information relating to Ms. Kane in the Prospectus and SAI are deleted and all references to the portfolio manager of the Fund shall refer to Mr. Kozlowski.

PLEASE KEEP THIS SUPPLEMENT FOR FUTURE REFERENCE

AMG Funds III published this content on October 21, 2025, and is solely responsible for the information contained herein. Distributed via Edgar on October 21, 2025 at 12:53 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 If you believe the information included in the content is inaccurate or outdated and requires editing or removal, please contact us at [email protected]