ASE Holding Announces Subsidiary Huan Hong Technology Acquires Facility Engineering Assets

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

2. Effective date of the transaction: November 18, 2025 ~ June 18, 2026

3. Board approval date: June 18, 2026

4. Other approval dates: Not applicable

5. Quantity of 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 thousand (excluding tax) Total transaction amount: NT$372,806 thousand (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: Daya Electric Engineering 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 counterparty, the previous transferor, the relationship between the previous transferor and the company and the counterparty, the transfer date, and the transfer amount: Not applicable

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

9. Estimated 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 restriction clauses, and other important agreements: Delivery or payment terms: As stipulated in the contract Contractual restriction clauses: None Other important agreements: None

11. Decision method of this transaction (e.g., bidding, comparison, negotiation), reference basis for price determination, and decision-making unit: Decision method and reference basis for price: Comparison and negotiation Decision-making unit: As per the company's internal authorization 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 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 fees: None

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

24. Opinion of directors who objected to this transaction: None

25. Whether this transaction is a related-party transaction: No

26. Date of supervisor approval or audit committee consent: June 18, 2026

27. Whether this transaction involves acquiring real estate or right-of-use assets from a related party: No

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

29. Valuation amount 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