ASE Holdings Announces Subsidiary's Acquisition of Operating Machinery from Mitac Automation

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

2. Date of occurrence: November 3, 2025 (ROC Year 114) to June 30, 2026 (ROC Year 115)

3. Board approval date: Not applicable

4. Other approval dates: Approval level: Approved by General Manager June 30, 2026 (ROC Year 115)

5. Quantity of transaction units (e.g., XX square meters, equivalent to XX ping), unit price, and total transaction amount: Transaction quantity: One batch Unit price: NT$14,573,200,000 (excluding tax) Total transaction amount: NT$14,573,200,000 (excluding tax)

6. Counterparty and its relationship with the company (if the counterparty is a natural person and not a related party, name disclosure may be omitted): Counterparty: Mitac Automation Co., Ltd. Relationship with the company: None

7. If the counterparty is a related party, state the reason for selecting such 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 asset’s owner within the past five years was a related party of the company, 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 (including payment period and amount), contractual restrictions, and other important agreements: Delivery or payment terms: Payment via telegraphic transfer or letter of credit Contractual restrictions: None Other important agreements: None

11. Method of transaction determination (e.g., bidding, price comparison, or negotiation), reference basis for price determination, and decision-making unit: Transaction determination method and price reference basis: Price comparison and negotiation Decision-making unit: In accordance with the company’s authorization regulations

12. Name of professional appraisal 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 limited, 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. Reasons for significant discrepancies in appraisal results and auditor’s opinion: Not applicable

19. Name of accounting firm: Not applicable

20. Name of accountant: Not applicable

21. License number of accountant: Not applicable

22. Broker and brokerage fees: None

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

24. Dissenting director’s opinion on the transaction: Not applicable

25. Whether this 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