[ASE Holding] Subsidiary ASE Semiconductor Manufacturing Corp. Announces Acquisition of Facility Engineering Assets from Changding Engineering Co., Ltd.

1. Name and nature of the subject matter (e.g., land located at Section XX, Minor Section XX, North District, Taichung City): Facility engineering for business operations

2. Date of occurrence: 115/8/20 ~ 115/9/23

3. Board approval date: Not applicable

4. Other decision dates: Decision level: Approved by General Manager September 23, 115th year of the Republic Era

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$372,684 thousand (excluding tax) Cumulative total transaction amount: NT$372,684 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: Changding Engineering Co., Ltd. Relationship with the company: None

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

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

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

10. Delivery or payment terms (including payment period and amounts), 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 the transaction (e.g., tender, comparative pricing, or negotiation), basis for price determination, and decision-making unit: Method and basis: Comparative pricing and negotiation Decision-making unit: As per the company's internal authorization policy

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. Auditor firm name: Not applicable

20. Auditor name: Not applicable

21. Auditor license number: 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 the transaction: Not applicable

25. Whether the transaction is with a related party: No

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

27. Whether the 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 in the preceding 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