Company: ATLN
Filing Date: 2025-08-22
Form Type: 424B3
Source: 0001213900-25-079897
Chunk: 0

Company: ATLANTIC INTERNATIONAL CORP.
Filing Date: 2025-08-22
Form: 424B3
Chunk 0
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Filed Pursuant to

Rule 424(b)(3) under the

Securities Act of 1933
Registration No. 333-280653

PROSPECTUS SUPPLEMENT

Dated August 22, 2025

(To Prospectus Dated July 22, 2024)

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

13,711,743 Shares of Common Stock</div>

This prospectus supplement (the “Sticker
Supplement”) modifies, supersedes and supplements certain information contained in, and should be read in conjunction with, our
Prospectus filed with the SEC dated July 22, 2024 (the “Prospectus”), related to the offer and resale of up to an aggregate
of 13,711,743 shares of common stock par value $0.00001 per share held by Selling Shareholders set forth under the title “Selling
Shareholders”.

This Sticker Supplement is not complete without,
and may not be delivered or used except in connection with, the Prospectus.

Our shares of common stock are quoted on the NASDAQ
Capital Market under the symbol “ATLN.” On August 21, 2025, the last reported sale price of our common stock on the NASDAQ
Capital Market was $3.96 per share.

The information contained in this Sticker Supplement
modifies and supersedes, in part, the information in the Prospectus. Any information that is modified or superseded in the Prospectus
shall not be deemed to constitute a part of the Prospectus, except as modified or superseded by this Sticker Supplement.

We may amend or supplement the Prospectus from
time to time by filing amendments or supplements as required. You should read the entire Prospectus, and any amendments or supplements
carefully before you make an investment decision.

Investing in our securities involves risks. See “Risk Factors” beginning on page 4 of the Prospectus and in documents incorporated by reference into the Prospectus.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this Sticker Supplement, or the Prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

<div align='center'>FORWARD-LOOKING STATEMENTS</div>

You should carefully consider the risk factors
set forth in the Prospectus, as well as the other information contained in or incorporated by reference into this Sticker Supplement and
the Prospectus