Form 497 Tidal Trust III
Filed pursuant to Rule 497(e)
Registration Nos. 333-221764; 811-23312

(DUTY) U.S. Defense ETF
(the “Fund”)
listed on NYSE Arca, Inc.
June 9, 2026
Supplement to the Prospectus and
Statement of Additional Information (“SAI”),
each dated April 6, 2026, as previously supplemented
Effective immediately, all references in the Prospectus and SAI to distributions of dividends and interest income, if any, are hereby changed to reflect that the Fund intends to pay out dividends and interest income, if any, annually.
Please retain this Supplement for future reference.
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