ASE Holdings Announces Subsidiary Taiwan Furei Electronics Acquires Factory Facility Engineering from Morikawa Construction

1. Name and nature of the subject matter (e.g., land located in Section X, Subsection X, North District, Taichung City): Factory facility engineering for operational use

2. Date of occurrence: June 3, 115 to June 24, 115

3. Board approval date: Not applicable

4. Other approval dates: Approval level: Approved by General Manager June 24, 115 (2026)

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$308,166 thousand (excluding tax) Total transaction amount: NT$308,166 thousand (excluding tax)

6. Counterparty and its relationship with the company (if the counterparty is a natural person and not a related party of the company, name disclosure may be omitted): Counterparty: Morikawa Construction Engineering 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 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) from 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 determining the transaction (e.g., bidding, competitive bidding, or negotiation), reference basis for price determination, and decision-making unit: Transaction determination method and pricing reference: Competitive bidding and negotiation Decision-making unit: As per the company’s authorization rules

12. Name of professional appraiser firm or company and appraisal value: 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. 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 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. Opinion of any director who objected to the transaction: Not applicable

25. Whether this 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