Company: SSUP
Filing Date: 2025-07-09
Form Type: DEFA14A
Source: 0001193125-25-157148
Chunk: 165

Company: SUPERIOR INDUSTRIES INTERNATIONAL INC
Filing Date: 2025-07-09
Form: DEFA14A
Chunk 165
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 Voting and Support Agreement (the “ Agreement”), entered into as of [●], 2025, by and among Superior Industries International, Inc., a Delaware corporation (the “ Company”) and the undersigned’s spouse. The undersigned hereby agrees that the interest of the undersigned’s spouse in all property which is the subject of the Agreement shall be irrevocably bound by the terms of the Agreement and by any amendment, modification, waiver or termination signed by the undersigned’s spouse. The undersigned further agrees that the undersigned’s community property interest in all property which is the subject of the Agreement shall be irrevocably bound by the terms of the Agreement, and that the Agreement shall be binding on the executors, administrators, heirs and assigns of the undersigned. The undersigned further authorizes the undersigned’s spouse to amend, modify or terminate the Agreement, or waive any rights thereunder, and that each such amendment, modification, waiver or termination signed by the undersigned’s spouse shall be binding on the community property interest of undersigned in all property which is the subject of the Agreement and on the executors, administrators, heirs and assigns of the undersigned, each as fully as if the undersigned had signed such amendment, modification, waiver or termination.

| Dated:____________________, 2025 |     |       |
|                                  |     | Name: |

Exhibit 10.3

EXECUTION VERSION

SUBSCRIPTION AGREEMENT

SUBSCRIPTIONAGREEMENT, dated as of July 8, 2025 (this “”), by and between Superior Industries
International, Inc., a Delaware corporation (the “”), and SUP Parent Holdings, LLC, a Delaware limited liability company (the “”). Capitalized terms used but not defined herein shall have the
meanings given to them in the Merger Agreement (as defined below).

WHEREAS, the Company, Purchaser and SUP Merger Sub, Inc.
(“”) have entered into that certain Agreement and Plan of Merger, dated on or about the date hereof (the “”), pursuant to which the Company shall merge with and into Merger Sub, with the
Company surviving as a wholly owned subsidiary of the Purchaser (the “”).

WHEREAS, prior to consummation of the
Merger, the Purchaser desires to acquire from the Company, and the Company desires to issue and sell to the Purchaser, the number of shares of common stock, $0.01 par value per share, of the Company (