3711 ASE Group Announces Subsidiary's Acquisition of Production Equipment Worth Over NTD 1.5 Billion

Disclosure Date: 1150707 Statement Date: 1150706 Statement Time: 204727 Company Code: 3711 Company Name: ASE Group Subject: Announcement on Behalf of Subsidiary Siliconware Precision Industries Co., Ltd. Regarding Acquisition of Operational Equipment Exceeding NTD 1 Billion Compliance Clause: Item 20 Event Date: 1150706 Details: 1. Name and Nature of the Asset (e.g., land located in Section X, Subsection X, North District, Taichung City): Operational machinery and equipment

2. Event Date: 115/7/3 ~ 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 Units (e.g., XX square meters, equivalent to XX ping), Unit Price, and Total Transaction Amount: Acquired 4 batches, Average unit price per batch: NTD 383,671,225, Total transaction amount: NTD 1,534,684,900.

6. Counterparty and Its Relationship with the Company (If the counterparty is an individual and not a related party, name disclosure may be omitted): Counterparty: INVENTEC TECHNOLOGY CORPORATION; Relationship with the Company: None

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

8. If the asset’s owner within the past five years was a related party of the company, disclose the related party’s acquisition and disposal date, 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) (deferred gains/losses should be listed and explained): 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 determining the transaction (e.g., bidding, competitive quotation, or negotiation), basis for price determination, and decision-making unit: Transaction determination method: Competitive quotation/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 indicates a restricted, 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. Explanation of 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. Accountant’s license number: Not applicable

22. Broker and brokerage fees: None

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

24. Dissenting director’s opinion on the transaction: None

25. Is this a related-party transaction?: No

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

27. Is the transaction for 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