ASE Holding Announces Subsidiary ASE Semiconductor Manufacturing Co., Ltd. Acquires Operating Equipment from Disco High-Tech Corporation

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 operational use

2. Date of occurrence: 115/3/19 ~ 115/7/3

3. Board approval date: Not applicable

4. Other approval dates: Approval level: Approved by General Manager July 3, 2026 (Minguo Year 115)

5. Quantity of units (e.g., XX square meters, equivalent to XX ping), unit price, and total transaction amount: Quantity: One batch Unit price: NT$1,025,921 thousand (excluding tax) Total transaction amount: NT$1,025,921 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, name disclosure may be omitted): Counterparty: Disco High-Tech Corporation Relationship with the company: None

7. If the counterparty is a related party, disclose the reason for selecting such party, the previous transferor, the relationship among the company, the counterparty, and the previous transferor, the previous transfer date, and transfer amount: Not applicable

8. If the ownership of the subject matter was held by a related party of the company within the past five years, disclose the date of acquisition and disposal, 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 status): Not applicable

10. Delivery or payment terms (including payment period and amount), contractual restriction clauses, and other important agreements: Delivery or payment terms: Payment by telegraphic transfer or letter of credit Contractual restriction clauses: None Other important agreements: None

11. Method of determining this transaction (e.g., bidding, price comparison, or negotiation), reference basis for price determination, and decision-making unit: Method and reference basis: Price comparison and negotiation Decision-making unit: In accordance with the company's approval authority regulations

12. Name of professional appraisal firm or company and appraisal amount: Not applicable

13. Name of professional appraiser: Not applicable

14. Professional appraiser license number: 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 an appraisal report: Not applicable

18. Reasons for significant differences in appraisal results and auditor's opinion: Not applicable

19. Name of accounting firm: Not applicable

20. Name of accountant: Not applicable

21. Accountant license number: 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 directors who objected to this transaction: Not applicable

25. This transaction is a related-party transaction: No

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

27. This 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 or Disposal Rules for Publicly Issued Companies': Not applicable

29. Valuation price pursuant to 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