ASE Holdings Announces Subsidiary ASE Semiconductor Manufacturing Co., Ltd. Acquires Machinery and Equipment for Business Operations from Yineng Technology Co., Ltd.

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

2. Date of occurrence: July 21, 2025 ~ July 6, 2026

3. Board approval date: Not applicable

4. Other approval dates: Approval level: Approved by the General Manager July 6, 2026, Republic of China (R.O.C.)

5. Quantity of units (e.g., XX square meters, equivalent to XX ping), unit price, and total transaction amount: Transaction quantity: One batch Unit price: NT$1,044,640 thousand (excluding tax) Cumulative total transaction amount: NT$1,044,640 thousand (excluding tax)

6. Counterparty and its relationship with the company (if the counterparty is an individual and not a related party of the company, the name may be omitted): Counterparty: Yineng Technology Co., Ltd. Relationship with the company: None

7. If the counterparty is a related party, state the reason for selecting the related party as the transaction counterparty, 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 ownership of the transaction subject was held by a related party of the company within the past five years, state the date of acquisition and disposal by the related party, the price, and the relationship with the company at the time of transaction: 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 restrictive clauses, and other important agreements: Delivery or payment terms: Payment via telegraphic transfer or letter of credit Contractual restrictive clauses: None Other important agreements: None

11. Method of determining the transaction (e.g., bidding, price comparison, or price negotiation), reference basis for price determination, and decision-making unit: Method of transaction determination and reference basis for price: Price comparison and negotiation Decision-making unit: In accordance with the company's authorized decision-making 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 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 the appraisal results, state the reason and the accountant'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 fee: 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 the transaction is with a related party: No

26. Date of confirmation by supervisor or approval by audit committee: Not applicable

27. Whether the transaction involves acquiring real estate or right-of-use assets from a related party: No

28. Valuation price pursuant to Article 16 of the 'Asset Acquisition and Disposal Handling Standards for Publicly Issued Companies': Not applicable

29. Valuation price pursuant to Article 17 of the said standards, 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