[CTBC] Announcement on Disposal of Securities

1. Securities Name: Nanya Technology Common Stock 2. Transaction Date: June 3, 2026 ~ June 8, 2026 3. Board of Directors Approval Date: N/A 4. Other Decision Date: Decision Level: Chairman's Decision June 8, 2026 5. Transaction Quantity, Unit Price, and Total Transaction Amount: Transaction Quantity (thousands of shares): 825 Unit Price (NTD): 377.26 Total Transaction Amount (NTD): 311,241,989 6. Disposal Gain (or Loss) (Not applicable for securities acquired): Disposal Gain: 6,770,597 NTD 7. Relationship with the Company of the Traded Securities: None 8. Cumulative Holding Quantity, Amount, Shareholding Ratio, and Restriction Status (e.g., pledge status) of this Transaction Security (including this transaction) up to the present: Holding Balance: 1,555,000 shares, Amount: 583,560,216 NTD Shareholding Ratio: 0.045%, Restriction Status: None 9. Up to the present, the proportion of securities investments (including this transaction) listed in Article 3 of the "Rules Governing the Acquisition or Disposal of Assets by Publicly Issued Companies" to the total assets and the equity attributable to owners of the parent in the company's latest financial statements, and the amount of working capital in the latest financial statements: Proportion of Total Assets: 79.46% Proportion of Equity Attributable to Owners of the Parent: 114.13% Working Capital Amount: 8,285,327 thousand NTD 10. Specific Purpose of Acquisition or Disposal: Investment Portfolio 11. Opinions of Directors Who Expressed Dissent Regarding This Transaction: None 12. Is This Transaction a Related Party Transaction: No 13. Counterparty to the Transaction and its Relationship with the Company: N/A 14. Date of Supervisor's Approval or Audit Committee's Consent: N/A 15. Date of Previous Announcement of Material Information on the Same Event: N/A 16. Other Explanatory Matters: Authorized on March 31, 2026, for authorized traders to conduct securities transactions in the centralized trading market during the second quarter of 2026. Keywords: Material Information