Company: ATLN
Filing Date: 2025-01-24
Form Type: 424B3
Source: 0001213900-25-006537
Chunk: 2

Company: ATLANTIC INTERNATIONAL CORP.
Filing Date: 2025-01-24
Form: 424B3
Chunk 2
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 the Staffing 360 Merger Agreement adoption proposal. Your vote is very important, regardless of the number of shares you own. Whether or not you plan to attend the Special Meeting virtually, please promptly mark, sign and date the accompanying proxy card and return it in the enclosed postage -paid envelope or authorize the individuals named on your proxy card to vote your shares by calling the toll -free telephone number or by voting online as described in the instructions included with your proxy card. The accompanying proxy statement/prospectus provides you with important information about the special meeting, the Merger, and each of the proposals. We encourage you to read the entire document carefully, in particular the “ Risk Factors ” section beginning on page 13 of the accompanying proxy statement / prospectus for a discussion of risks relevant to the Merger. We look forward to the successful completion of the Merger.

| Sincerely,                           |
| /s/ Brendan Flood                    |
| Brendan Flood                        |
| Chairman and Chief Executive Officer |
| Staffing 360 Solutions, Inc.         |

Neither the U.S. Securities and Exchange Commission nor any state securities commission has approved or disapproved of the Merger, the Atlantic International common stock to be issued in the Merger or determined if the accompanying proxy statement / prospectus is accurate or complete. Any representation to the contrary is a criminal offense. The accompanying proxy statement/prospectus is dated as of, and is first being mailed to the stockholders of Staffing 360 Solutions on or about January24, 2025.

STAFFING 360 SOLUTIONS 757 3 rd Avenue, 27 th Floor
New York, New York 10017 NOTICE OF SPECIAL MEETING OF STOCKHOLDERS OF STAFFING 360 SOLUTIONS, INC. TO BE HELD ON FEBRUARY 3 , 2025 To the Stockholders of Staffing 360 Solutions, Inc.: NOTICE IS HEREBY GIVENthat Staffing 360 Solutions, Inc. (“Staffing 360”) will hold a completely virtual special meeting of its stockholders (the “Special Meeting”) at the Special Meeting’s website, at www.virtualshareholdermeeting.com/STAF2025SM, on February3, 2025, beginning at 10:00, Eastern Time, for the purpose of considering and voting on the following proposals: (1)to adopt that certain Agreement and Plan of Merger, dated November 1, 2024 (as amended by the First Amendment thereto, dated as of January