CHT announced acquisition of marketable securities

1. Name of Security: Nanya Technology Corporation Ordinary Shares

2. Transaction Date: 2026/06/29 ~ 2026/06/30

3. Board Approval Date: Not applicable

4. Other Approval Dates: Approval Level: Approved by Chairman Approved on June 30, 2026 (Minguo Year 115)

5. Transaction Quantity, Unit Price, and Total Transaction Amount: Quantity (in thousands of shares): 890 Unit Price (NT$): 446.30 Total Transaction Amount (NT$): 397,207,336

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: 2,004,000 shares, Amount: NT$924,424,759 Ownership Percentage: 0.06%, Rights Restrictions: None

9. Cumulative Marketable Securities Investment (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 the Parent in the Company's Most Recent Financial Statements, and the Amount of Working Capital in the Most Recent Financial Statements: Percentage of Total Assets: 82.70% Percentage of Equity Attributable to Owners of the Parent: 118.78% Working Capital Amount: NT$8,285,327 thousand

10. Specific Purpose of Acquisition or Disposal: Investment portfolio

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 Disclosures: On March 31, 2026 (Minguo Year 115), authorized traders were granted authority to conduct securities transactions in the centralized market during the second quarter of 2026.