CHT Corporation Announces Acquisition of Marketable Securities

1. Security Name: Nanya Technology Corporation Common Stock

2. Transaction Date: 2026/9/4 ~ 2026/9/11

3. Board Approval Date: Not applicable

4. Other Approval Dates: Approval Level: Approved by Chairman Date: September 11, 2026 (Minguo Year 115)

5. Transaction Quantity, Unit Price, and Total Amount: Quantity (in thousands of shares): 900 Unit Price (NT$): 503.43 Total Transaction Amount (NT$): 453,088,279

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 Security (including this transaction) to Date – Quantity, Amount, Ownership Percentage, and Restricted Rights (e.g., pledged): Holding Balance: 2,209,000 shares, Amount: NT$1,064,601,637 Ownership Percentage: 0.06%, Rights Restrictions: None

9. Proportion of Marketable Securities Investment (including this transaction) under Article 3 of the 'Asset Acquisition and Disposal Rules for Publicly Issued Companies' to 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: 86.12% Percentage of Equity Attributable to Owners of Parent: 115.79% Working Capital Amount: NT$8,285,327 thousand

10. Specific Purpose of Acquisition or Disposal: Portfolio investment

11. Dissenting Director’s Opinion 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 for the Same Event: Not applicable

16. Other Explanatory Matters: On June 30, 2026 (Minguo Year 115), authorized traders were granted permission to conduct securities transactions in the centralized market during the third quarter of 2026.