DIODES INC /DEL/

Our Chief Executive Officer, Gary Yu, and Chief Financial Officer, Brett R. Whitmire, with the participation of our management, carried out an evaluation, as of September 30, 2025, of the effectiveness of our disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)). Based upon that evaluation, the Chief Executive Officer and the Chief Financial Officer believe that, as of the end of the period covered by this Quarterly Report on Form 10-Q, our disclosure controls and procedures are effective at the reasonable assurance level to ensure that information required to be included in this Quarterly Report is:

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recorded, processed, summarized, and reported within the time period specified in the Commission’s rules and forms; and

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accumulated and communicated to our management, including the Chief Executive Officer and the Chief Financial Officer, to allow timely decisions on required disclosure.

Disclosure controls and procedures, no matter how well designed and implemented, can provide only reasonable assurance of achieving an entity’s disclosure objectives. The likelihood of achieving such objectives is affected by limitations inherent in disclosure controls and procedures. These include the fact that human judgment in decision-making can be faulty and that breakdowns in internal control can occur because of human failures such as simple errors, mistakes, or intentional circumvention of the established processes.

Changes in Internal Controls over Financial Reporting

There was no change in our internal control over financial reporting, known to our Chief Executive Officer or Chief Financial Officer, that occurred in the three months ended September 30, 2025, that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

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