ASE Holdings Announces Subsidiary's Acquisition of Operating Facility Engineering Assets from Shihlin Electric's Kaohsiung Branch

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

2. Date of occurrence: August 15, 2025 ~ June 16, 2026

3. Board approval date: Not applicable

4. Other approval dates: Approval level: Approved by General Manager June 16, 2026, Republic of China (ROC) calendar

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$314,761 thousand (excluding tax) Cumulative total transaction amount: NT$314,761 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: Shihlin Electric & Engineering Corporation, Kaohsiung Branch Relationship with the company: None

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

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

10. Delivery or payment terms (including payment period and amount), contractual restrictions, and other important agreements: Delivery or payment terms: Payment via 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: Transaction determination method and price reference basis: Price comparison and negotiation Decision-making unit: In accordance with the company's internal approval authority regulations

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

13. Name of professional appraiser: Not applicable

14. License number of professional appraiser: Not applicable

15. Whether the appraisal report indicates a limited 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. If there is a significant difference in appraisal results, state the reason and auditor's opinion: Not applicable

19. Name of accounting firm: Not applicable

20. Name of accountant: Not applicable

21. License number of accountant: 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 any director who objected to this transaction: Not applicable

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

26. Date of supervisor approval or audit committee consent: Not applicable

27. Whether 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