Company: SSUP
Filing Date: 2025-07-08
Form Type: DEFA14A
Source: 0001193125-25-156514
Chunk: 17

Company: SUPERIOR INDUSTRIES INTERNATIONAL INC
Filing Date: 2025-07-08
Form: DEFA14A
Chunk 17
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 forth in the Proxy Statement and other
materials to be filed with the SEC in connection with the Merger.

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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 8, 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 99.1 News Release Superior to be Acquired by a Group of Existing Term Loan Investors Committed to Its Long-Term Stability and Growth SOUTHFIELD, MICHIGAN – July 8, 2025– Superior Industries International, Inc. ( “ Superior ” or the “ Company ” ) (OTC Pink:SSUP )today announced it has entered into definitive agreements to be acquired by a group of its term loan investors (the “Investors”), including Oaktree Capital Management. As part of the transaction, the Investors will convert a significant portion of their term loans into equity which, alongside the extinguishment of the Company’s preferred stock, will better position the business for long-term growth with customers and suppliers across the global wheel industry. Under the terms of the transaction agreements, which have been approved by Superior’s Board of Directors:

| • |     | The acquisition will be implemented via a merger with an entity indirectly owned by the Investors. |

| • |     | The Investors will convert up to approximately $550 million of their term loan claims into 96.5% of the 
 common equity of an indirect parent company of the surviving entity (the “New Equity”).                 |

| • |     | The Company’s existing revolving credit facility and factoring facilities will remain in place on their 
 current terms or be refinanced prior to the closing of the transaction.                                 |

| • |     | Holders of the Company’s common stock will receive, in the aggregate, approximately $3.1 million in                                               
 cash, and the holder of the Company’s preferred stock will receive approximately $6.2 million in cash and an aggregate of 3.5% of the New Equity. |

| • |     | Company stockholders representing approximately 40% of the Company’s