Company: ATLN
Filing Date: 2025-06-23
Form Type: S-3
Source: 0001213900-25-056432
Chunk: 2

Company: ATLANTIC INTERNATIONAL CORP.
Filing Date: 2025-06-23
Form: S-3
Chunk 2
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 sale is not permitted.

<div align='center'>PRELIMINARY PROSPECTUS

SUBJECT TO COMPLETION: DATED JUNE 23, 2025

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 June 20, 2025 the last reported sale price prior to the date of this prospectus, of the
common stock on the Nasdaq Global Market was $2.45. 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.

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