ASE Holding Announces Subsidiary's Acquisition of Facility Engineering Assets from Fan-Hsin System Technology

1. Name and nature of the subject matter (e.g., land located in Section XX, Subsection XX, North District, Taichung City): Facility engineering for operational use

2. Date of occurrence: 115/6/9 ~ 115/6/29

3. Board approval date: Not applicable

4. Other approval dates: Approval level: Approved by General Manager June 29, 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 Unit price: NT$331,323 thousand (excluding tax) Total transaction amount: NT$331,323 thousand (excluding tax)

6. Counterparty and its relationship with the company (if the counterparty is a natural person and not a related party of the company, name disclosure may be omitted): Counterparty: Fan-Hsin System Technology Co., Ltd. Relationship with the company: None

7. If the counterparty is a related party, state the reason for selecting the related party as the transaction counterparty, the previous transferor, the relationship between the previous transferor and the company and the counterparty, the previous transfer date, and the transfer amount: Not applicable

8. If the ownership of the transaction subject was held by a related party of the company within the past five years, state the date of acquisition and disposal by the related party, the price, and the relationship with the company at the time of transaction: Not applicable

9. Expected gain (or loss) on disposal (not applicable for asset acquisition) (if deferred, list and explain recognition status): Not applicable

10. Delivery or payment terms (including payment period and amount), contractual restrictions, and other important agreements: Delivery or payment terms: Payment by telegraphic transfer or letter of credit Contractual restrictions: None Other important agreements: None

11. Method of determining this transaction (e.g., bidding, price comparison, or negotiation), reference basis for price determination, and decision-making unit: Method of determination and reference basis for price: Price comparison and negotiation Decision-making unit: In accordance with 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. License number of professional appraiser: Not applicable

15. Whether the appraisal report is for a limited price, specific price, or special price: No or not applicable

16. Whether the 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. Name of auditor firm: Not applicable

20. Name of auditor: Not applicable

21. License number of auditor: Not applicable

22. Broker and brokerage fee: None

23. Specific purpose or use of acquisition or disposal: For production and operational use

24. Opinion of director who objected to 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