Subsidiary Announces In-House Construction Project for Factory Buildings on Owned Land

Release Date: July 4, 2026 Statement Date: July 3, 2026 Statement Time: 15:38:01 Company Code: 2383 Company Name: TK EMC (Taiwan) Subject: Announcement by subsidiary TK Electronic Materials (Kunshan) Co., Ltd. regarding construction project on owned land Applicable Clause: Item 20 Factual Date: July 3, 2026

Details: 1. Type of Contract: Construction Contract 2. Factual Date: July 3, 2026 ~ July 3, 2026 3. Board Approval Date: July 30, 2025 (R.O.C. Year 114) 4. Other Approval Dates: Not applicable 5. Contract Counterparty and Relationship with Company: Jiangsu Yongtai Construction Engineering Co., Ltd. Relationship with Company: None 6. Main Contents of the Contract (including total contract value, expected investment amount, contract start and end dates, restrictive clauses, and other important terms): Construction of factory and dormitory buildings. The cumulative amount of engineering contracts awarded to the same counterparty over the past year amounts to approximately NT$560,351 thousand. The project is contracted according to the company's construction schedule. 7. Name of Professional Appraisal Firm or Company and Appraisal Results: 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 production and operational needs 11. Dissenting Director Opinions on the Transaction: Not applicable 12. Is the Transaction a Related-Party Transaction: No 13. Date of Supervisor Approval or Audit Committee Consent: Not applicable 14. Is the Appraisal Report a Limited Price, Specific Price, or Special Price: No or Not applicable 15. Has an Appraisal Report Not Been Obtained: No or Not applicable 16. Reason for Not 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 Statements: None