4,000,000 Shares of Common Stock

ATLANTIC INTERNATIONAL CORP

This prospectus supplement and accompanying prospectus relates to the offering of 4,000,000 shares (the "Shares") of common stock, par value $0.00001 per share ("Common Stock") of Atlantic International Corp, a Delaware corporation (the "Company") to E.F. Hutton & Co., LLC or its permitted transferees (the "Stockholder"). The shares of Common Stock offered hereby (the "Shares) are being issued to the Stockholder pursuant to an Exclusive Financial Advisor letter agreement dated February 4, 2026.

Our Common Stock is listed on the Nasdaq Global Market under the symbol "ATLN." On May 26, 2026, the last reported sale price prior to the date of this prospectus supplement, of the Common Stock on the Nasdaq Global Market was $1.37.

You should carefully read this prospectus supplement, as well as the documents incorporated or deemed to be incorporated by reference herein or therein, before you purchase any of our securities. Other than the Stockholder, there are no underwriters, dealers and agents participating in this offering.