3711 ASE Group

Release Date: 1150707 Statement Date: 1150706 Statement Time: 204629 Company Code: 3711 Company Name: ASE Group Subject: Announcement on behalf of subsidiary Siliconware Precision Industries Co., Ltd. regarding acquisition of operating machinery and equipment exceeding ten billion NTD Compliance Clause: Item 20 Factual Date: 1150706

1. Name and nature of the subject matter (e.g., land located in Section XX, Subsection XX, North District, Taichung City): Operating machinery and equipment

2. Factual Date: 115/6/17 ~ 115/7/6

3. Board approval date: Not applicable

4. Other decision dates: Decision level: Approved by General Manager July 6, 115 (2026)

5. Quantity of transaction units (e.g., XX square meters, equivalent to XX ping), unit price, and total transaction amount: Acquired 3 batches, Average unit price per batch: NTD 715,786,000, Total transaction amount: NTD 2,147,358,000.

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: SEMIGEAR, INC.; Relationship with company: None

7. If the counterparty is a related party, disclose the reason for selecting such party, the previous transferor, the relationship among the previous transferor, the company, and the counterparty, the previous transfer date, and 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, disclose the date, price, and relationship with the company at the time of acquisition and disposal: 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 periods and amounts), contractual restrictions, and other important agreements: Wire transfer. Contractual restrictions: None. Other important agreements: None.

11. Method of transaction decision (e.g., bidding, comparison, negotiation), basis for price determination, and decision-making unit: Transaction decision method: Comparison/negotiation. Basis for price determination: Reference to historical transaction data and market conditions. Decision-making unit: Decided according to internal company approval authority.

12. Name of professional appraisal 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, specific, 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. Reasons for significant differences in appraisal results 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 operational use

24. Dissenting opinions from directors regarding this transaction: None

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. Evaluation price under Article 16 of the 'Asset Acquisition and Disposal Handling Standards for Publicly Issued Companies': Not applicable

29. Evaluation price under Article 17 of the same standards, if the price under the previous item is lower than the transaction price: Not applicable

30. Previous date of major information disclosure regarding the same event: Not applicable

31. Other explanatory matters: None