ASE Holding Announces Subsidiary SPIL's Acquisition of Operating Equipment Exceeding NT$1 Billion

1. Name and nature of the subject matter (e.g., land located in Section XX, Subsection XX, North District, Taichung City): Operating equipment

2. Date of occurrence: 2026/6/15 ~ 2026/6/16

3. Board approval date: Not applicable

4. Other approval dates: Approval level: Approved by General Manager June 16, 2026 (Minguo Year 115)

5. Quantity of units (e.g., XX square meters, equivalent to XX ping), unit price, and total transaction amount: Acquired 2 batches Average unit price per batch: NT$3,950,326,763 Total transaction amount: NT$7,900,653,525

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: Advantest Corporation Relationship with the company: None

7. If the counterparty is a related party, disclose the reason for selecting the related party, the previous transferor, the relationship between the previous transferor and the company and the counterparty, the previous transfer date, and the transfer amount: Not applicable

8. If the subject asset had an owner who 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, provide a table showing recognition): Not applicable

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

11. Method of transaction decision (e.g., bidding, price comparison, 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. License number of professional appraiser: Not applicable

15. Whether the appraisal report is for a limited price, specific price, or special price: No or not applicable

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

17. Reason for not obtaining the appraisal report: Not applicable

18. Reasons for significant differences in appraisal results and auditor's opinion: Not applicable

19. Name of auditor firm: Not applicable

20. Name of auditor: Not applicable

21. Auditor license number: Not applicable

22. Broker and brokerage fee: None

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

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 amount under Article 16 of the 'Regulations Governing the Acquisition or Disposition of Assets by Publicly Issued Companies': Not applicable

29. Valuation amount 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