Company: ATLN
Filing Date: 2025-07-08
Form Type: 424B3
Source: 0001213900-25-062079
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Company: ATLANTIC INTERNATIONAL CORP.
Filing Date: 2025-07-08
Form: 424B3
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| PROSPECTUS | FILED PURSUANT TO 424(b)(3)           |
|            | Registration Statement No. 333-288226 |

<div align='center'>ATLANTIC INTERNATIONAL CORP.

9,925,914 Shares of

Common Stock</div>

This prospectus relates to the sale (the “Offering”)
by the selling shareholders, and in the related amounts, (the “Selling Shareholders”) of up to 9,925,914 shares of common
stock, $0.00001 par value (the “Shares”), of Atlantic International Corp. (the “Company,” “Atlantic”
or “we”) issued to the Selling Shareholders consisting of: (a) an aggregate of 9,905,914 shares issued under the Amended
and Restated Agreement and Plan of Reorganization dated June 4, 2024, as amended, by and among the Company, SeqLL Merger LLC, Atlantic
Acquisition Corp., Atlantic Merger LLC, Lyneer Investments LLC and IDC Technologies Inc. (the “Merger Agreement”), and (b)
20,000 shares issued in exchange for legal services rendered.

Our common stock is quoted
on the Nasdaq Global Market under the symbol “ATLN.” On July 2, 2025 the last reported sale price prior to the date of this
prospectus, of the common stock on the Nasdaq Global Market was $2.06. The Shares may be sold at prevailing market prices or privately
negotiated prices or in transactions that are not in the public market. The Selling Shareholders have informed us that they do not have
any agreement or understanding, directly or indirectly, with any person to distribute their shares of Common Stock. The Company will not
receive any proceeds from the sale of the Shares by the Selling Shareholders. Additional information on the Selling Shareholders, and
the manner in which they may offer and sell the Shares, is provided under “Selling Shareholders” and “Plan of Distribution”
in this prospectus.

Investing in our shares involves risks. You should carefully review the risks and uncertainties described under the heading “ Risk Factors” on page 3 and under similar headings in the other documents that are incorporated by reference into this prospectus.

Neither the Securities and Exchange Commission (the “SEC”) nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense