Company: ATLN
Filing Date: 2025-01-23
Form Type: S-4/A
Source: 0001213900-25-006032
Chunk: 2

Company: ATLANTIC INTERNATIONAL CORP.
Filing Date: 2025-01-23
Form: S-4/A
Chunk 2
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, is effective. This proxy statement/prospectus is not an offer to sell these securities and is not soliciting offers to buy these securities in any jurisdiction where the offer or sale is not permitted.

PRELIMINARY — SUBJECT TO COMPLETION: DATED JANUARY 23, 2025 PROXY STATEMENT FOR THE SPECIAL MEETING OF STAFFING 360 SOLUTIONS, INC.
AND PROSPECTUS FOR 2,108,188 SHARES OF COMMON STOCK OF ATLANTIC INTERNATIONAL CORP.

| ATLANTIC INTERNATIONAL CORP. |     | STAFFING 360 SOLUTIONS, INC. |

MERGER PROPOSAL — YOUR VOTE IS VERY IMPORTANT Dear Stockholders: On November 1, 2024, Atlantic International Corp., a Delaware corporation (“Atlantic International”), Staffing 360 Solutions, Inc., a Delaware corporation (“Staffing 360”), and A36 Merger Sub, Inc., a Delaware corporation and a wholly -ownedsubsidiary of Atlantic (the “Merger Sub”), entered into an Agreement and Plan of Merger (as amended by the First Amendment thereto, dated as of January7, 2025, and as it may be further amended from time to time, the “Merger Agreement”), for the acquisition of Staffing 360 by Atlantic International. Pursuant to the terms of the Merger Agreement, Atlantic International will cause Merger Sub to merge with and into Staffing 360 (the “Merger”), with Staffing 360 surviving the Merger as a wholly -ownedsubsidiary of Atlantic International. Upon completion of the Merger, each (i) share of the outstanding common stock of Staffing 360 (“Staffing 360 common stock”), (ii) share of the outstanding Series H preferred stock of Staffing 360 (“Series H Preferred Stock”) and (iii) share of the outstanding Series I preferred stock of Staffing 360 (“Series I Preferred Stock”) immediately prior to the Effective Time (as defined in the Merger Agreement), other than Excluded Shares (as defined in the Merger Agreement), will be canceled and converted into the right to receive such number of shares of Atlantic International common stock equal to the number of such shares of Staffing 360 they hold multiplied by the exchange ratio of (i) 1.202, in the case of Staffing 360 common stock, (ii) 0.25, in the case of Series H Preferred Stock, and (iii) 1.00, in