Company: SSUP
Filing Date: 2025-07-09
Form Type: DEFA14A
Source: 0001193125-25-157148
Chunk: 0

Company: SUPERIOR INDUSTRIES INTERNATIONAL INC
Filing Date: 2025-07-09
Form: DEFA14A
Chunk 0
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 8, 2025 SUPERIOR INDUSTRIES INTERNATIONAL, INC. (Exact Name of Registrant as Specified in Its Charter)

| Delaware                     |     | 001-06615   |     | 95-2594729         |
| (State or Other Jurisdiction 
 of Incorporation)            |     | -Commission 
 File Number |     | -IRS Employer      
 Identification No. |

| 26600 Telegraph Road, Suite 400          |     |           |
| Southfield, Michigan                     |     |     48033 |
| (Address of Principal Executive Offices) |     | -Zip Code |

Registrant’s Telephone Number, Including Area Code: (248) 352-7300 Not Applicable (Former Name or Former Address, if Changed Since Last Report) Check the appropriate box below if the Form 8-Kfiling is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

| ☐ | Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) |

| ☒ | Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 
 CFR 240.14a-12)                                                        |

| ☐ | Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) |

| ☐ | Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) |

Securities registered pursuant to Section 12(b) of the Act:

| Title of Each Class                     |     | Trading 
  Symbol |     | Name of Each Exchange 
   on Which Registered |
| Common Stock, par value $0.01 per share |     |      -1 |     |                    -1 |

| (1) | On June 25, 2025, the New York Stock Exchange (“NYSE”) filed a Form 25 for Superior                                                                                                                                                         
 Industries International, Inc., a Delaware corporation (the “Company”), in connection with the delisting of the common stock, par value $0.01, of