Company: SSUP
Filing Date: 2025-07-09
Form Type: DEFA14A
Source: 0001193125-25-157148
Chunk: 178

Company: SUPERIOR INDUSTRIES INTERNATIONAL INC
Filing Date: 2025-07-09
Form: DEFA14A
Chunk 178
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| By:                                     |     | /s/ Majdi Abulaban                           |
|                                         |     | Name: Majdi Abulaban                         |
|                                         |     | Title: President and Chief Executive Officer |

[ Signature Page to Subscription Agreement]

| SUP PARENT HOLDINGS, LLC |     |                      |
| By:                      |     | /s/ Robert LaRoche   |
|                          |     | Name: Robert LaRoche |
|                          |     | Title: President     |

[ Signature Page to Subscription Agreement]

Exhibit 10.4

Execution Version

RECAPITALIZATION SUPPORT AGREEMENT

This
RECAPITALIZATION SUPPORT AGREEMENT (together with all exhibits, schedules, and attachments hereto, as each may be amended, supplemented, or otherwise modified from time to time in accordance with the terms hereof,
this “Agreement”), dated as of July 8, 2025, is entered into by and among:

(a) Superior Industries
International, Inc. (“Superior”) and each of its subsidiaries (together with Superior, collectively, the “Company” and each a “Company Party”); and

(b) the beneficial and record owners (or nominees, investment managers, advisors or subadvisors for, or subaccount or funds of, the beneficial
owners or record owners, as applicable) of Term Loan Obligations (as defined below), in each case, as identified on the signature pages hereto or that have executed a Joinder Agreement (as defined below) (the “ConsentingTerm Loan Lenders”).

Subject to hereof, the Company and each Consenting
Term Loan Lender are referred to herein collectively as the “Parties” and each individually as a “Party.” Capitalized terms used but not defined herein shall have the meanings ascribed to
such terms in the Recapitalization Term Sheet (as defined below).

RECITALS

WHEREAS, the Parties have engaged in arm’s-length, good faith discussions regarding a
comprehensive recapitalization of the Company;

WHEREAS, the Parties have agreed to a transaction
(the “Transaction”) involving (i) the partial equitization of the term loans under the Existing Credit Agreement and (ii) a recapitalization of the Company, subject to the terms and conditions of this Agreement
and the terms set forth in the term sheet attached hereto as ExhibitA (as may be amended, supplemented, or otherwise modified from time to time in accordance with the terms hereof,