ASE Holdings Announces Subsidiary's Acquisition of Facility Engineering Assets from Jing Tai Engineering

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

2. Date of occurrence: July 10, 2025 ~ July 7, 2026

3. Board approval date: Not applicable

4. Other approval dates: Approval level: Approved by General Manager July 7, 2026 (Minguo 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$314,133,000 (excluding tax) Total transaction amount: NT$314,133,000 (excluding tax)

6. Counterparty and its relationship with the company (if the counterparty is an individual and not a related party, name disclosure may be omitted): Counterparty: Jing Tai Engineering Co., Ltd. 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 subject asset was owned by 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: 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 determining the transaction (e.g., bidding, price comparison, or negotiation), basis for price determination, and decision-making unit: Transaction determination method and pricing basis: Price comparison and negotiation Decision-making unit: In accordance with the company's internal approval authority regulations

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 indicates a limited, specific, 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. 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 "Asset Acquisition and Disposal Rules for Publicly Issued Companies": Not applicable

29. Valuation price 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 regarding the same event: Not applicable

31. Other explanatory matters: None