ASE Holding Announces Subsidiary's Acquisition of Facility Engineering Project

Announcement Date: August 13, 2026 Statement Date: August 12, 2026 Statement Time: 15:50:52 Company Code: 3711 Company Name: ASE Holding Subject: Announcement by Subsidiary Silicon Precision Industries Co., Ltd. Regarding Acquisition of Facility Engineering Applicable Clause: Item 20 Factual Date: August 12, 2026 Details: 1. Type of Contract: Facility Engineering 2. Factual Date: August 10, 2026 ~ August 12, 2026 3. Board Approval Date: Not applicable 4. Other Approval Dates: Approval Level: Approved by CEO August 12, 2027 (Minguo Year 115) 5. Counterparty and Relationship with Company: Chung Yuan Engineering Consultants Inc. Relationship with Company: None 6. Main Contents of Contract (including total amount, estimated investment, contract duration), restrictive clauses, and other important terms: Total Amount: NT$507,160,500 Contract Period: August 10, 2026 (Minguo 115) to December 31, 2027 (Minguo 116) Restrictive Clauses and Other Important Terms: None 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 production and operational use 11. Dissenting Director's Opinion on This Transaction: None 12. Whether this transaction is a related-party transaction: No 13. Date of Supervisor Approval or Audit Committee Consent: Not applicable 14. Whether the appraisal report is at a limited price, specific price, 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 obtaining appraisal report: Not applicable 17. Reasons for significant differences in appraisal results and CPA opinion: Not applicable 18. Name of CPA Firm: Not applicable 19. Name of CPA: Not applicable 20. CPA License Number: Not applicable 21. Previous date of material information disclosure regarding the same event: Not applicable 22. Other Statements: None