3711 ASE Holding

Disclosure Date: 1150623 Statement Date: 1150622 Statement Time: 173924 Company Code: 3711 Company Name: ASE Holding Subject: Announcement on behalf of subsidiary ASE Semiconductor Manufacturing Co., Ltd. regarding the acquisition of facility equipment and engineering assets for operational use from SFA Engineering Technology Co., Ltd. Compliance Clause: Clause 20 Factual Date: 1150622 Details: 1. Name and nature of the subject matter (e.g., land located in Section XX, Subsection XX, North District, Taichung City): Facility equipment and engineering assets for operational use 2. Factual date: 115/5/11 ~ 115/6/22 3. Board approval date: Not applicable 4. Other approval dates: Approval level: Approved by General Manager Date: June 22, 115 (2026) 5. Quantity of transaction units (e.g., XX square meters, equivalent to XX ping), unit price, and total transaction amount: Transaction quantity: One batch Approximate unit price: NT$349,063,000 (excluding tax) Cumulative total transaction amount: NT$349,063,000 (excluding tax) 6. Counterparty and its relationship with the company (if the counterparty is an individual and not a related party of the company, name disclosure may be omitted): Counterparty: SFA Engineering Technology Co., Ltd. Relationship with the company: None 7. If the counterparty is a related party, the reason for selecting the related party as the transaction counterparty, the previous owner of the asset, the relationship among the previous owner, the company, and the counterparty, the previous transfer date, and the transfer amount shall be disclosed: Not applicable 8. If the owner of the transaction subject was a related party of the company within the past five years, the date, price, and relationship with the company at the time of acquisition and disposal by the related party shall be disclosed: Not applicable 9. Estimated gain (or loss) from disposal (not applicable for asset acquisition) (if deferred, recognition details shall be listed): Not applicable 10. Delivery or payment terms (including payment period and amount), contractual restriction clauses, and other important agreements: Delivery or payment terms: Payment by telegraphic transfer or letter of credit Contractual restriction clauses: None Other important agreements: None 11. Transaction decision method (e.g., bidding, price comparison, or negotiation), basis for price determination, and decision-making unit: Transaction decision method and basis for price determination: Price comparison and negotiation Decision-making unit: As per the company's approval authority regulations 12. Name of professional appraiser firm or company and appraisal amount: Not applicable 13. Name of professional appraiser: Not applicable 14. Professional appraiser license number: Not applicable 15. Whether the appraisal report is for a restricted price, specific price, or special price: No or not applicable 16. Whether an appraisal report has not yet been obtained: No or not applicable 17. Reason for not yet obtaining the appraisal report: Not applicable 18. Reasons for significant differences in appraisal results and auditor's opinion: Not applicable 19. Auditor firm name: Not applicable 20. Auditor name: Not applicable 21. Auditor license number: Not applicable 22. Broker and brokerage fees: None 23. Specific purpose or use of the acquisition or disposal: For production and operational use 24. Opinion of directors who expressed dissent on this transaction: Not applicable 25. This transaction is a related-party transaction: No 26. Date of supervisor approval or audit committee consent: Not applicable 27. This transaction involves acquiring real estate or right-of-use assets from a related party: No 28. Valuation price under Article 16 of the 'Regulations Governing the Acquisition or Disposition of Assets by Publicly Issued Companies': Not applicable 29. Valuation price under Article 17 of the same regulations if the valuation under the previous item is lower than the transaction price: Not applicable 30. Previous date of material information disclosure regarding the same event: Not applicable 31. Other explanatory matters: None