3711 ASE Holding

Disclosure Date: 1150714 Statement Date: 1150713 Statement Time: 172226 Company Code: 3711 Company Name: ASE Holding Subject: Announcement on behalf of subsidiary SPIL Precision Industry Co., Ltd. regarding acquisition of operating machinery and equipment exceeding ten billion NTD Compliance Clause: Item 20 Factual Date: 1150713 Details: 1. Name and nature of the subject (e.g., land located in Section XX, Subsection XX, North District, Taichung City): Operating machinery and equipment

2. Factual date: 115/6/16 ~ 115/7/13

3. Board approval date: Not applicable

4. Other approval dates: Approval level: Approved by General Manager July 13, 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 5 batches, Average unit price per batch: NTD 221,234,012, Total transaction amount: NTD 1,106,170,061.

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: Tazmo Co., Ltd.; 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 among the previous transferor, the company, and the counterparty, the previous transfer date, and transfer amount: Not applicable

8. If the owner of the subject asset 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) on disposal (not applicable for asset acquisition) (if deferred, list and explain recognition status): Not applicable

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

11. Decision method of this transaction (e.g., bidding, quotation, or negotiation), reference basis for price determination, and decision-making unit: Transaction decision method: Quotation/negotiation. Reference basis for price determination: Based on 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. Professional appraiser license number: 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 the appraisal result, explain the reason and include the accountant's opinion: Not applicable

19. Name of accounting firm: Not applicable

20. Name of accountant: Not applicable

21. Accountant license number: Not applicable

22. Broker and brokerage fee: None

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

24. Opinion of directors who objected to 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 Handling Standards for Publicly Issued Companies': Not applicable

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

30. Previous date of material information disclosure for the same event: Not applicable

31. Other disclosures: None