ASE Group Subsidiary Acquires Facility Engineering Assets from MARKETECH INTERNATIONAL SDN. BHD.

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

2. Date of occurrence: November 11, 2025 ~ July 22, 2026

3. Date approved by the Board of Directors: Not applicable

4. Other approval dates: Approval level: Approved by General Manager July 22, 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 Total cumulative transaction amount: MYR 62,060,156 (approximately NT$484,239,673)

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: MARKETECH INTERNATIONAL SDN. BHD. 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 owner of the transaction subject had been a related party of the company within the past five years, state the date of acquisition and disposal, price, and relationship with the company at the time of transaction: 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: Telegraphic transfer 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 and reference basis: 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 an appraisal report has not yet been obtained: No or not applicable

17. Reason for not obtaining the appraisal report: Not applicable

18. If there is a significant difference in appraisal results, explain the reason and include 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 fee: None

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

24. Opinion of any director who expressed dissent on this transaction: Not applicable

25. This transaction is a related-party transaction: No

26. Date approved by supervisor or audit committee: 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 '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