Company: SSUP
Filing Date: 2025-07-08
Form Type: DEFA14A
Source: 0001193125-25-156514
Chunk: 7

Company: SUPERIOR INDUSTRIES INTERNATIONAL INC
Filing Date: 2025-07-08
Form: DEFA14A
Chunk 7
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 materiality applicable to the contracting parties that differ from those
applicable to investors and security holders. Investors and security holders are not third-party beneficiaries under the Merger Agreement and should not rely on the representations, warranties, covenants and agreements, or any descriptions thereof,
as characterizations of the actual state of facts or condition of any party to the Merger Agreement. Moreover, information concerning the subject matter of the representations and warranties may change after the date of the Merger Agreement, which
subsequent information may or may not be fully reflected in the Company’s public disclosures.

A copy of the Merger Agreement will be filed as an
exhibit to an amendment of this Current Report on Form 8-K, and the foregoing description of the Merger Agreement is qualified in its entirety by reference thereto.

Concurrently with the
execution of the Merger Agreement on July 8, 2025, the Company entered into Voting and Support Agreements (the “”) with each of TPG Growth III Sidewall, L.P. (“”) and certain
directors, officers and other stockholders (collectively, the “” and, together with TPG, the “” and, individually, a “”)
with respect to shares owned of record or beneficially by each Supporting Stockholder (collectively, the “”).

4

The Supporting Stockholders have agreed to vote all of their Owned Shares:

| • |     | in favor of the Merger, the adoption of the Merger Agreement, each of the other actions contemplated by the                              
 Merger Agreement or necessary or desirable in furtherance of the Merger and the other transactions contemplated by the Merger Agreement; |

| • |     | against any action or agreement that could reasonably be expected to result in any of the conditions to the                                                                                                                            
 consummation of the Merger under the Merger Agreement not being fulfilled or result in a breach of any covenant, representation or warranty or any other obligation or agreement of the Company contained in the Merger Agreement; and |

| • |     | against any Acquisition Proposal (which is not a Superior Proposal or an Acquisition Proposal for which the Board                                                                                                                                         
 has made a Change in Recommendation) or any agreement, transaction or other matter that is intended to, or would reasonably be expected to, impede or interfere with the consummation of the Merger and the other transactions contemplated by the Merger 
 Agreement.                                                                                                                                                                                                                                                |

In the event the Board makes a Change in Recommendation, each Supporting Stockholder