ASE Holding Announces Subsidiary SPIL's Acquisition of Facility Engineering Project

1. Contract Type: Facility Engineering 2. Event Date: June 29, 2026 ~ July 6, 2026 3. Board Approval Date: Not applicable 4. Other Approval Dates: Approval Level: Approved by General Manager July 6, 2026 5. Contract Counterparty and Relationship with Company: Chung Yuan Engineering Co., Ltd., Relationship with Company: None 6. Main Contract Contents (including total contract amount, expected investment amount, and contract period), restrictive clauses, and other important terms: Total Amount: NT$1,211,695,700; Contract Period: June 29, 2026 to June 30, 2028; 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. Directors' Objections to This Transaction: None 12. Related-Party Transaction: No 13. Date of Supervisor Approval or Audit Committee Consent: Not applicable 14. Is the Appraisal Report at a Restricted, Specific, or Special Price: No or Not applicable 15. Has the Appraisal Report Not Been Obtained: No or Not applicable 16. Reason for Not 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 Accountant: Not applicable 20. License Number of Accountant: Not applicable 21. Previous Date of Material Information Disclosure on the Same Event: Not applicable 22. Other Disclosures: None