CTBC Holding Announces Subsidiary CTBC Bank Fined by Financial Supervisory Commission

Announcement Date: July 3, 2026 Statement Date: July 2, 2026 Statement Time: 19:17:02 Company Code: 2891 Company Name: CTBC Holding Subject: Announcement on behalf of subsidiary CTBC Bank Co., Ltd. regarding penalty imposed by the Financial Supervisory Commission Applicable Clause: Clause 26 Factual Event Date: July 2, 2026

Details: 1. Factual Event Date: July 2, 2026 2. Entity Involved: Reporting on behalf of subsidiary: CTBC Bank Co., Ltd. 3. Reason for Incident (Event Description): A former employee of CTBC Bank misappropriated the bank’s ATM clearing funds and financial clearing funds. This violation contravened the Banking Act and the applicable "Internal Control and Audit System Implementation Measures for Financial Holding Companies and Banking Institutions" at the time. Accordingly, a fine of NT$4 million has been imposed under Article 129, Paragraph 7 of the Banking Act. 4. Handling Process: The company will implement necessary improvements in accordance with regulatory guidance. 5. Penalty Imposed: A fine of NT$4,000,000. 6. Was a monetary penalty imposed? Yes 7. Amount of Fine (NT$): 4,000,000 8. Estimated Potential Loss or Impact: NT$4,000,000 9. Potential Insurance Reimbursement Amount (NT$): None 10. Improvement Status and Future Measures: The company will carry out required improvements as directed by the regulatory authority. Business operations remain normal. 11. Has a major information disclosure already been made regarding the same incident? No 12. Other Matters to be Disclosed: None