ASE Technology 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: June 15, 2026 ~ July 6, 2026

3. Board approval date: Not applicable

4. Other approval dates: Approval level: Approved by General Manager July 6, 2026 (Minguo Year 115)

5. Quantity (e.g., XX square meters, converted to XX ping), unit price, and total transaction amount: Acquired 7 batches Average unit price per batch: NT$334,743,565 Total transaction amount: NT$2,343,204,958

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: KLA Corporation Relationship with the company: None

7. If the counterparty is a related party, state the reason for selecting the related party, the previous transferor, the relationship among the previous transferor, the company, and the counterparty, the previous transfer date, and the transfer 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: 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 schedule and amounts), contractual restrictions, and other important agreements: Payment by telegraphic transfer Contractual restrictions: None Other important agreements: None

11. Transaction decision method (e.g., bidding, competitive quotation, negotiation), basis for price determination, and decision-making unit: Transaction decision 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 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 appraisal results, explain the reason and include auditor's opinion: Not applicable

19. Name of accounting firm: Not applicable

20. Name of auditor: Not applicable

21. License number of auditor: 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. 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 "Asset Acquisition and Disposal Rules for Publicly Issued Companies": Not applicable

29. Valuation amount 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 for the same event: Not applicable

31. Other explanatory matters: None