Winbond: Announcement of Ordering Machinery and Equipment

1. Name and nature of the objective (e.g., land parcel XX, section XX, Beitu District, Taichung City): Machinery and equipment 2. Date of occurrence of the event: 115/5/8~115/5/8 (May 8, 2026) 3. Date of approval by the board of directors: Not applicable 4. Other approval dates: Approval level: Handled according to the company's approval authority regulations May 8, 2026 (R.O.C. calendar year 115) 5. Quantity of transaction units (e.g., XX square meters, equivalent to XX pings), price per unit, and total transaction amount: Quantity: One batch; Total transaction amount: NT$3,509,862,650 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, disclosure of their name may be exempted): Lam Research International Sdn. Bhd.; Non-related party 7. If the counterparty is a related party, the announcement shall also include the reason for selecting the related party as the transaction object, the previous owner, the relationship between the previous owner and the company and the counterparty, the date of previous transfer, and the transfer amount: Not applicable 8. If the ownership of the transaction objective has been a related party of the company within the past five years, the announcement shall also include the related party's acquisition and disposal dates, prices, and its relationship with the company at the time of the transaction: Not applicable 9. Estimated disposal profit (or loss) (not applicable for asset acquisition) (deferred items should be listed to explain recognition status): Not applicable 10. Delivery or payment terms (including payment period and amount), contract restrictions, and other important agreements: Payment according to order terms 11. Method of determining this transaction (e.g., bidding, price comparison or negotiation), reference basis for price determination, and decision-making unit: Price comparison and negotiation; Based on quotations provided by manufacturers and market conditions as reference; Handled according to the company's approval authority regulations. 12. Name of professional appraiser's firm or company and its appraised amount: Not applicable 13. Name of professional appraiser: Not applicable 14. Professional appraiser's license number: Not applicable 15. Whether the appraisal report is for limited, specific, or special prices: No or not applicable 16. Whether the appraisal report has not yet been obtained: No or not applicable 17. Reason for not yet obtaining the appraisal report: Not applicable 18. Reasons for significant differences in appraisal results and 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: Not applicable 23. Specific purpose or use of acquisition or disposal: For production use 24. Opinion of dissenting director on this transaction: Not applicable 25. This transaction is a related party transaction: No 26. Date of approval by supervisors or audit committee: Not applicable 27. This transaction involves acquiring real estate or its right-of-use assets from a related party: No 28. Price assessed according to Article 16 of the "Regulations Governing the Acquisition and Disposal of Assets by Public Companies": Not applicable 29. If the price assessed in the preceding item is lower than the transaction price, the price assessed according to Article 17 of the same regulations: Not applicable 30. Date of previous significant announcement on the same event: Not applicable 31. Other matters to be specified: None