3711 ASE Holding

Disclosure Date: 1150722 Statement Date: 1150721 Statement Time: 174350 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: Clause 20 Factual Date: 1150721

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: 114/7/25 ~ 115/7/21

3. Board approval date: Not applicable

4. Other approval dates: Approval level: Approved by General Manager July 21, 115 (2026)

5. Quantity of units transacted (e.g., XX square meters, equivalent to XX ping), unit price, and total transaction amount: Acquired 28 batches, average price per batch: NTD 45,002,728 Total transaction amount: NTD 1,260,076,377

6. Counterparty and its relationship with the company (If the counterparty is an individual and not a related party of the company, name disclosure may be exempted): Counterparty: EO TECHNICS CO., LTD. Relationship with company: None

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

8. If the owner of the subject matter 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) (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: Payment by wire transfer. Contractual restrictions: None. Other important agreements: None.

11. Method of determining the transaction (e.g., bidding, competitive bidding, or negotiation), reference basis for price determination, and decision-making unit: Transaction determination method: Competitive bidding/negotiation. Price reference basis: Historical transaction data and market conditions. Decision-making unit: Determined 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. If there is a significant difference in appraisal results, explain the reason and provide 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 the acquisition or disposal: For operational use

24. Dissenting opinions from directors regarding this transaction: None

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

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

27. Is this transaction an acquisition of 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 Rules for Publicly Issued Companies': Not applicable

29. Valuation price under Article 17 if the price 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