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

1. Contract Type: Facility Engineering 2. Event Date: 1/5/2026 ~ 7/22/2026 3. Board Approval Date: Not applicable 4. Other Approval Dates: Approval Level: Approved by General Manager July 22, 2026 5. Contract Counterparty and Relationship with Company: Tai-Ching Engineering Technology Co., Ltd., Relationship with Company: None 6. Main Contract Contents (including total contract value, expected investment amount, contract start and end dates), restrictions, and other important terms: Total Amount: NT$601,292,000, Contract Period: January 5, 2026 to October 31, 2027, Restrictions 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 business operations 11. Directors' Opinions Objecting to This Transaction: None 12. 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, 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 Statements: None