[ASE Technology Holding] Announcement on behalf of its subsidiary ASE Semiconductor Manufacturing Co., Ltd. Regarding the Acquisition of Machinery and Equipment for Business Operations from Waffer Technology Corporation

1. Name and Nature of the Target: Machinery and equipment for business operations 2. Date of Occurrence of the Event: 2026/2/4~2026/5/4 3. Date of Board Resolution: Not applicable 4. Other Approval Dates: General Manager's approval on May 4, 2026 (Republic of China Calendar Year 115) 5. Quantity of Transaction Units (e.g., XX square meters, converted to XX pings), Unit Price, and Total Transaction Amount: Transaction Quantity: One batch Unit Price: NT$1,023,877 thousand (excluding tax) Accumulated Total Transaction Amount: NT$1,023,877 thousand (excluding tax) 6. Counterparty of the Transaction and its Relationship with the Company (If the counterparty is a natural person and not a related party of the company, their name may be omitted): Counterparty: Waffer Technology Corporation Relationship with the Company: None 7. If the counterparty is a related party, the reason for selecting the related party as the transaction object, the previous transferor, the relationship between the previous transferor and the company and the counterparty, the previous transfer date, and transfer amount shall be announced: Not applicable 8. If the owner of the transaction target has been a related party of the company within the last five years, the acquisition and disposal dates, prices, and relationship with the company at the time of the transaction shall be announced: Not applicable 9. Estimated Disposal Profit (or Loss) (Not applicable for asset acquisition) (For deferred items, a table explaining the recognition status should be provided): Not applicable 10. Delivery or Payment Terms (including payment period and amount), Contract Restriction Clauses, and Other Important Agreed Matters: Delivery or Payment Terms: Wire transfer or letter of credit payment Contract Restriction Clauses: None Other Important Agreed Matters: None 11. Method of Determining this Transaction (e.g., tender, price comparison, or negotiation), Reference Basis for Price Determination, and Decision-making Unit: Method of Determining the Transaction and Reference Basis for Price Determination: Price comparison and negotiation Decision-making Unit: Handled in accordance with the company's approval authority regulations 12. Name of Professional Appraiser Firm or Company and Appraisal Amount: Not applicable 13. Name of Professional Appraiser: Not applicable 14. Professional Appraiser's License Number: Not applicable 15. Is the appraisal report a limited price, specific price, or special price? No or Not applicable 16. Has the appraisal report not yet been obtained? No or Not applicable 17. Reason for not yet obtaining the appraisal report: Not applicable 18. If there is a material discrepancy in the appraisal results, the reason for the discrepancy and the accountant's opinion: Not applicable 19. Name of Accounting Firm: Not applicable 20. Name of Accountant: Not applicable 21. Accountant's License Number: Not applicable 22. Broker and Brokerage Fees: None 23. Specific Purpose or Use of Acquisition or Disposal: For production and operations 24. Opinions of Directors who expressed dissent to this transaction: Not applicable 25. Is this transaction a related party transaction? No 26. Date of Supervisor's Approval or Audit Committee's Consent: Not applicable 27. Is this transaction for acquiring real estate or its right-of-use assets from a related party? No 28. Price evaluated according to Article 16 of the "Regulations Governing the Acquisition and Disposal of Assets by Public Companies": Not applicable 29. If the price evaluated in the preceding paragraph is lower than the transaction price, the price evaluated according to Article 17 of the same regulations: Not applicable 30. Date of previous significant announcement regarding the same event: Not applicable 31. Other Matters to be Specified: None.