Hung-Chin Board Approves Self-Funded Construction Project for Long-Shan Plant

1. Type of Contract: Self-Funded Construction 2. Event Date: June 15, 2026 ~ June 15, 2026 3. Board Approval Date: June 15, 2026 (Minguo Year 115) 4. Other Approval Dates: Not applicable 5. Counterparty and Relationship with the Company: To be announced upon confirmation. 6. Main Contract Contents (including total contract amount, estimated investment amount, contract start and end dates, restrictive clauses, and other important terms): Estimated total construction budget is NT$1.4 billion. 7. Name of Professional Appraisal Firm or Company and Appraisal Result: Not applicable 8. Name of Real Estate Appraiser: Not applicable 9. License Number of Real Estate Appraiser: Not applicable 10. Specific Purpose of Acquisition: For company operational needs 11. Dissenting Director Opinions on the Transaction: None 12. Whether the Transaction is a Related-Party Transaction: No 13. Date of Supervisor Approval or Audit Committee Consent: June 15, 2026 (Minguo Year 115) 14. Whether the Appraisal Report is at a Limited, Specific, or Special Price: No or Not applicable 15. Whether Appraisal Report Has Not Yet Been Obtained: No or Not applicable 16. Reason for Not Yet Obtaining 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: Not applicable 22. Other Explanatory Matters: None