Central: Announcement of Company's Acquisition of Securities

1. Name of the security: Winbond Common Stock 2. Transaction dates: 115/5/5 to 115/5/7 (ROC calendar) 3. Date of board of directors' approval: Not applicable 4. Other approval dates: Approval level: Chairman's approval, May 7, 115 (ROC calendar) 5. Transaction volume, unit price, and total transaction amount: Transaction volume (thousand shares): 869, Unit price (NTD): 514.22, Total transaction amount (NTD): 446,854,035 6. Profit (or loss) from disposal (not applicable for acquisition of securities): Not applicable 7. Relationship with the target company: None 8. As of now, the cumulative number, amount, shareholding ratio, and restricted rights (e.g., pledged shares) of this security (including this transaction): Current holdings: 369,000 shares, Amount: NT$192,893,181, Shareholding ratio: 0.09%, Restricted rights: None 9. As of now, the proportion of investment in securities (including this transaction) listed under Article 3 of the "Regulations Governing the Acquisition and Disposal of Assets by Public Companies" to the company's most recent financial report's total assets and equity attributable to owners of the parent company, and the working capital amount in the most recent financial report: Proportion of total assets: 75.40%, Proportion of equity attributable to owners of the parent company: 105.61%, Working capital amount: NT$8,285,327 thousand 10. Specific purpose of acquisition or disposal: Investment portfolio 11. Opinions of dissenting directors for this transaction: None 12. Is this a related party transaction: No 13. Counterparty and its relationship with the company: Not applicable 14. Date of supervisors' approval or audit committee's consent: Not applicable 15. Date of previous significant announcement on the same event: Not applicable 16. Other matters to be specified: Authorized eligible traders on March 31, 115 (ROC calendar), to conduct securities transactions in the centralized trading market during the second quarter of 115 (ROC calendar).