3711 ASE Holding

Disclosure Date: 1150710 Statement Date: 1150709 Statement Time: 175220 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 NT$1 billion Compliance Clause: Clause 20 Factual Date: 1150709 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: 114/7/11 ~ 115/7/9

3. Board approval date: Not applicable

4. Other approval dates: Approval level: Approved by General Manager July 9, 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 22 batches, Average unit price per batch: NT$47,637,261, Total transaction amount: NT$1,048,019,745.

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 omitted): Counterparty: Taiwan Nitto Denko Corporation; 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 transaction subject was a related party of the company within the past five years, 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, list and explain recognition): 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. Transaction decision method (e.g., bidding, price comparison, or negotiation), basis for price determination, and decision-making unit: Transaction decision method: Price 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 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 yet obtaining the appraisal report: Not applicable

18. If there is a significant difference in the appraisal result, explain the reason for the difference and 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 fees: None

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

24. Opinion of any director who objected to the transaction: None

25. Whether the transaction is a related-party transaction: No

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

27. Whether the transaction involves acquiring real estate or right-of-use assets from a related party: No

28. Valuation price under Article 16 of the 'Regulations Governing the Acquisition or Disposition of Assets by Publicly Issued Companies': Not applicable

29. Valuation price under Article 17 of the same regulations, 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