[Delta Electronics] (Supplementary Announcement) Our Company Announces Subsidiary DET's Board Resolution to Construct BP6, BP7, and BP P-A Plants in Thailand

1. Type of Contract: Engineering Contract

2. Effective Date: 115/3/31 ~ 115/6/18

3. Board Approval Date: November 28, 2025 (Minguo Year 114)

4. Other Approval Dates: Not applicable

5. Counterparty and Relationship with the Company: The counterparties for the mechanical and electrical engineering contracts are Jansung Technology (Thailand) Co., Ltd. and Shundi Intelligent Engineering (Thailand) Co., Ltd. The counterparty for the air conditioning engineering contract is Dingqun Engineering (Thailand) Corporation Limited. None of these parties are related to our company.

6. Main Contract Contents (including total contract amount, estimated investment amount, contract start and end dates), Restrictive Clauses, and Other Important Agreements: Delta Electronics (Thailand) Public Company Limited (hereinafter referred to as DET), a subsidiary of the Company, resolved at its board meeting on November 28, 2025 (Minguo Year 114) to construct the BP6, BP7, and BP P-A plants in Thailand, with a provisional total project cost of approximately THB 3.402 billion. The combined value of the mechanical, electrical, and air conditioning engineering works is approximately THB 576 million (inclusive of tax). Other related matters will be announced separately upon confirmation.

7. Name of Professional Appraisal Firm or Company and Appraisal Result: Not applicable, as the construction is on self-owned land.

8. Name of Real Estate Appraiser: Not applicable

9. License Number of Real Estate Appraiser: Not applicable

10. Specific Purpose of Acquisition: To meet future business development needs

11. Dissenting Director's Opinion on This Transaction: None

12. Whether This Transaction is a Related-Party Transaction: No

13. Date of Supervisor's Approval or Audit Committee's Consent: Not applicable

14. Whether the Appraisal Report Indicates a Restricted, Specific, or Special Price: No or Not applicable

15. Whether an Appraisal Report Has Not Yet Been Obtained: No or Not applicable

16. Reason for Not Yet Obtaining the Appraisal Report: Not applicable

17. Reasons for Significant Differences in Appraisal Results and Auditor's Opinion: Not applicable

18. Name of Accounting Firm: Not applicable

19. Name of Auditor: Not applicable

20. Auditor's License Number: Not applicable

21. Previous Date of Material Information Disclosure on the Same Event: December 2, 2025 (Minguo Year 114)

22. Other Disclosures: None