3711 ASE Holding

Release Date: 2026/06/19 Statement Date: 2026/06/18 Statement Time: 14:29:33 Company Code: 3711 Company Name: ASE Holding Subject: Announcement on behalf of subsidiary Huan Hui Technology Co., Ltd. regarding the acquisition of factory facility engineering Compliance Clause: Item 20 Factual Date: 2026/06/18 Details: 1. Name and nature of the subject matter (e.g., land located in Section XX, Subsection XX, North District, Taichung City): Factory facility engineering for operational use

2. Factual occurrence date: 2025/11/18 ~ 2026/06/18

3. Board approval date: June 18, 2026 (Minguo Year 115)

4. Other approval dates: Not applicable

5. Quantity of transaction units (e.g., XX square meters, equivalent to XX ping), unit price, and total transaction amount: Transaction quantity: One batch Unit price: NT$372,806,000 (excluding tax) Total transaction amount: NT$372,806,000 (excluding tax)

6. Counterparty and its relationship with the company (if the counterparty is an individual and not a related party, name disclosure may be omitted): Counterparty: Daya Electric Engineering Co., Ltd. Relationship with the company: None

7. If the counterparty is a related party, state the reason for selection, previous owner, relationships among the previous owner, the company, and the counterparty, previous transfer date, and amount: Not applicable

8. If the owner of the subject matter within the past five years was a related party of the company, disclose the related party's acquisition and disposal date, price, and relationship with the company at the time: Not applicable

9. Estimated gain (or loss) from disposal (not applicable for asset acquisition) (if deferred, provide a table showing recognition): Not applicable

10. Delivery or payment terms (including payment schedule and amounts), contractual restrictions, and other important agreements: Delivery or payment terms: Payment as per contract agreement Contractual restrictions: None Other important agreements: None

11. Method of transaction determination (e.g., bidding, competitive quotation, or negotiation), basis for price determination, and decision-making unit: Transaction determination method and price basis: Competitive quotation and negotiation Decision-making unit: As per the company's internal authorization procedures

12. Name of professional appraiser firm or company and appraisal amount: Not applicable

13. Name of professional appraiser: Not applicable

14. License number of professional appraiser: Not applicable

15. Whether the appraisal report indicates a restricted, specific, 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 obtaining the appraisal report: Not applicable

18. Reasons for significant discrepancies in appraisal results and auditor's opinion: Not applicable

19. Name of accounting firm: Not applicable

20. Name of auditor: Not applicable

21. Auditor's license number: Not applicable

22. Broker and brokerage fees: None

23. Specific purpose or use of the acquisition or disposal: Operational needs

24. Dissenting opinions from directors regarding this transaction: None

25. Is this transaction with a related party? No

26. Date of supervisor approval or audit committee consent: June 18, 2026 (Minguo Year 115)

27. Is this transaction the acquisition of real estate or right-of-use assets from a related party? No

28. Valuation price under Article 16 of the 'Asset Acquisition and Disposal Rules for Publicly Issued Companies': Not applicable

29. Valuation price under Article 17 of the same rules 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