3711 ASE Group

Disclosure Date: 1150707 Statement Date: 1150706 Statement Time: 204816 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 NT$1 billion Compliance Clause: Item 20 Factual Date: 1150706 Details: 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: 115/6/15 ~ 115/7/6

3. Board approval date: Not applicable

4. Other approval dates: Approval level: Approved by General Manager July 6, 2026 (Minguo Year 115)

5. Quantity of transaction units (e.g., XX square meters, equivalent to XX ping), unit price, and total transaction amount: Acquired 7 batches, Average unit price per batch: NT$270,459,502, Total transaction amount: NT$1,893,216,512.

6. Counterparty and its relationship with the company (if the counterparty is a natural person and not a related party, name disclosure may be omitted): Counterparty: Wanhui Technology Co., Ltd.; Relationship with the company: None

7. If the counterparty is a related party, reason for selection, previous transferor, relationships among previous transferor, company, and counterparty, transfer date, and 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 at the time of acquisition and disposal: Not applicable

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

10. Delivery or payment terms (including payment period and amount), contractual restrictions, and other important agreements: Wire transfer. Contractual restrictions: None. Other important agreements: None.

11. Transaction decision method (e.g., tender, competitive bidding, or negotiation), basis for price determination, and decision-making unit: Transaction decision method: Competitive bidding/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 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, specific, or special price: No or not applicable

16. Whether appraisal report has not yet been obtained: No or not applicable

17. Reason for not obtaining 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 auditor: Not applicable

21. Auditor's license number: Not applicable

22. Broker and brokerage fees: None

23. Specific purpose or use of acquisition or disposal: For business operations

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

29. Valuation price under Article 17 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