Atlantic International Corp Files For Mixed Shelf Of Up To $250M

ATLANTIC INTERNATIONAL CORP.

Shares of Common Stock

Shares of Preferred Stock

Senior Debt Securities

Subordinated Debt Securities

Units

Subscription Rights

We may offer from time-to-time shares of our common stock, preferred stock, senior debt securities (which may be convertible into or exchangeable for common stock), subordinated debt securities (which may be convertible into or exchangeable for common stock), warrants, subscription rights and units that include any of these securities. The aggregate initial offeringprice of the securities sold under this prospectus will not exceed $250,000,000. We will offer the securities in amounts, at prices and on terms to be determined at the time of the offering.

Our common stock is listed on the Nasdaq Global Market under the symbol "ATLN." On December 4, 2025, the last reported sale price prior to the date of this prospectus, of the common stock on the Nasdaq Global Market was $2.28. The Shares may be sold at prevailing market prices or privately negotiated prices or in transactions that are not in the public market.

Each time we offer and sell securities, we will provide a supplement to this prospectus that contains specific information about the offering and the amounts, prices and terms of the securities. The supplement may also add, update or change information contained in this prospectus with respect to that offering. You should carefully read this prospectus, the applicable 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.

We may offer and sell the securities described in this prospectus and any prospectus supplement to or through one or more underwriters, dealers and agents, or directly to purchasers, or through a combination of these methods. These securities also may be resold by selling securityholders. If any underwriters, dealers or agents are involved in the sale of any of the securities, their names and any applicable purchase price, fee, commission or discount arrangement between or among them will be set forth, or will be calculable from the information set forth, in an applicable prospectus supplement. See the sections of this prospectus entitled "About this Prospectus" and "Plan of Distribution" for further information.

No securities may be sold without delivery of this prospectus and the applicable prospectus supplement describing the method and terms of the offering of such securities.