Company: SSUP
Filing Date: 2025-07-09
Form Type: DEFA14A
Source: 0001193125-25-157148
Chunk: 18

Company: SUPERIOR INDUSTRIES INTERNATIONAL INC
Filing Date: 2025-07-09
Form: DEFA14A
Chunk 18
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vestor-relations/financial-reports.html or through the SEC’s
website at http://www.sec.gov. Updated information regarding the identity of potential participants, and their direct or indirect interests in the Company, by security holdings or otherwise, will be set forth in the Proxy Statement and other
materials to be filed with the SEC in connection with the Merger.

11

SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

| Date: July 9, 2025 |     | SUPERIOR INDUSTRIES INTERNATIONAL, INC.                                        
 (Registrant)                                                                   
 /s/ David M. Sherbin                                                           |
|:-------------------|:----|:-------------------------------------------------------------------------------|
|                    |     | David M. Sherbin                                                               |
|                    |     | Senior Vice President, General Counsel, Secretary and Chief Compliance Officer |

12

Exhibit 2.1

Execution Version

Confidential

AGREEMENT AND PLAN OF MERGER

among

SUPERIOR INDUSTRIES
INTERNATIONAL, INC.,

SUP PARENT HOLDINGS, LLC

and

SUP MERGER SUB, INC.

Dated as of July 8, 2025

TABLE OF CONTENTS

|                                                  |     |                                               |     | Page |    |
| ARTICLE I                                        
 THE MERGER; CLOSING; EFFECTIVE TIME              |     |                                               |     |      |    |
| 1.1                                              |     | The Merger                                    |     |      |  2 |
| 1.2                                              |     | Closing                                       |     |      |  2 |
| 1.3                                              |     | Effective Time                                |     |      |  3 |
| ARTICLE II                                       
 ORGANIZATIONAL DOCUMENTS, DIRECTORS AND OFFICERS 
 OF THE SURVIVING CORPORATION                     |     |                                               |     |      |    |
| 2.1                                              |     | The Certificate of Incorporation              |     |      |  3 |
| 2.2                                              |     | The Bylaws                                    |     |      |  3 |
| 2.3                                              |     | Directors of Surviving Corporation            |     |      |  3 |
| 2.4                                              |     | Officers of the Surviving Corporation         |     |      |  3 |
| ARTICLE III                                      
 EFFECT OF THE