CHTBC Announces Acquisition of Marketable Securities

1. Name of Security: Nanya Technology Corporation Common Stock

2. Transaction Date: July 2, 2026 – July 3, 2026

3. Board Approval Date: Not applicable

4. Other Approval Dates: Approval Level: Approved by Chairman July 3, 2026

5. Transaction Quantity, Unit Price, and Total Transaction Amount: Quantity (in thousands of shares): 1,220 Unit Price (NT$): 401.53 Total Transaction Amount (NT$): 489,865,309

6. Gain (or Loss) on Disposal (Not applicable for acquisition of securities): Not applicable

7. Relationship with the Target Company: None

8. Cumulative Holdings of the Subject Securities (including this transaction) to Date – Quantity, Amount, Ownership Percentage, and Restricted Rights (e.g., pledge status): Holding Balance: 3,424,000 shares, Amount: NT$1,517,122,921 Ownership Percentage: 0.10%, Rights Restrictions: None

9. Cumulative Marketable Securities Investments (including this transaction) under Article 3 of the 'Asset Acquisition and Disposal Rules for Publicly Issued Companies' as a Percentage of Total Assets and Equity Attributable to Owners of Parent in the Company's Latest Financial Statements, and the Amount of Working Capital in the Latest Financial Statements: Percentage of Total Assets: 83.19% Percentage of Equity Attributable to Owners of Parent: 119.49% Working Capital Amount: NT$8,285,327 thousand

10. Specific Purpose of Acquisition or Disposal: Portfolio investment

11. Dissenting Director Opinions on this Transaction: None

12. Whether this Transaction is a Related-Party Transaction: No

13. Counterparty and its Relationship with the Company: Not applicable

14. Date of Supervisor Approval or Audit Committee Consent: Not applicable

15. Previous Date of Material Information Disclosure on the Same Event: Not applicable

16. Other Explanatory Matters: On June 30, 2026, authorized traders were granted permission to conduct securities transactions in the centralized market during the third quarter of 2026.