3711 ASE Holding

Disclosure Date: 1150703 Statement Date: 1150702 Statement Time: 163544 Company Code: 3711 Company Name: ASE Holding Subject: Announcement on behalf of subsidiary SPIL Precision Industry Co., Ltd. regarding acquisition of facility engineering Relevant Clause: Clause 20 Event Date: 1150702 Details: 1. Type of Contract: Facility Engineering 2. Event Date: 115/6/1 ~ 115/7/2 3. Board Approval Date: Not applicable 4. Other Approval Dates: Approval Level: Approved by General Manager July 2, 115 (2026) 5. Counterparty and Relationship with Company: Cheng Wei Engineering Technology Co., Ltd. Relationship with Company: None 6. Main Contract Contents (including total contract value, expected investment amount, contract period): Restrictive Clauses and Other Important Terms: Total Value: NTD 662,134,000 Contract Period: June 1, 115 (2026) to September 30, 116 (2027) 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 Opinions on This Transaction: None 12. Is This a Related-Party Transaction: No 13. Date of Supervisor Approval or Audit Committee Consent: Not applicable 14. Is the Appraisal Report at a Limited Price, Specific Price, or Special Price: No or Not applicable 15. Has the Appraisal Report Not Yet Been Obtained: No or Not applicable 16. Reason for Not Yet 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 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