【Chunghwa】Announcement of the Company's Disposal of Marketable Securities

1. Securities Name: Winbond Common Stock 2. Transaction Date: 115/5/6~115/5/8 (May 6-8, 2026) 3. Board Approval Date: Not Applicable 4. Other Approval Dates: Approval Level: Chairman's Approval Date: May 8, 115 (2026) 5. Transaction Quantity, Unit Price, and Total Transaction Amount: Transaction Quantity (thousands of shares): 640 Unit Price (NTD): 504.76 Total Transaction Amount (NTD): 323,046,329 6. Disposal Profit (or Loss) (Not applicable for acquisition of securities): Disposal Profit: 1,589,518 NTD 7. Relationship with the Investee Company: None 8. Cumulative Quantity, Amount, Shareholding Percentage, and Restrictions (e.g., pledges) of this Transaction's Securities Held to Date (including this transaction): Holding Balance: 469,000 shares, Amount: 243,394,600 NTD Shareholding Percentage: 0.11%, Restrictions: None 9. To Date, the Proportion of Securities Investment Listed in Article 3 of the Regulations Governing the Acquisition or Disposal of Assets by Public Offering Companies (including this transaction) to the Company's Total Assets and Equity Attributable to Owners of the Parent Company in the Latest Financial Statements, and the Amount of Working Capital in the Latest Financial Statements: Proportion of Total Assets: 76.88% Proportion of Equity Attributable to Owners of the Parent Company: 107.68% Working Capital Amount: 8,285,327 Thousand NTD 10. Specific Purpose of Acquisition or Disposal: Investment Portfolio 11. Opinions of Dissenting Directors on this Transaction: None 12. Is this transaction a related party transaction: No 13. Counterparty to the Transaction and its Relationship with the Company: Not Applicable 14. Date of Supervisor's Approval or Audit Committee's Consent: Not Applicable 15. Date of Previous Major Information Announcement on the Same Matter: Not Applicable 16. Other Disclosures: Authorized the authorized trader on 115/03/31 to conduct securities transactions in the centralized trading market during the second quarter of 115 (2026). Keywords: Major Information