CHTMC Announces Disposal of Securities

1. Security Name: MediaTek Common Stock

2. Transaction Date: 2026/06/04 ~ 2026/06/09

3. Board Approval Date: Not applicable

4. Other Approval Dates: Approval Level: Approved by Chairman Date: June 9, 2026 (Minguo Year 115)

5. Transaction Quantity, Unit Price, and Total Amount: Quantity (in thousands of shares): 100 Unit Price (NT$): 4,365.51 Total Transaction Amount (NT$): 436,551,429

6. Gain (or Loss) on Disposal (not applicable for acquisition of securities): Gain on Disposal: NT$2,124,642

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): Remaining Holdings: 55,000 shares, Amount: NT$241,262,372 Ownership Percentage: 0.003%, Rights Restrictions: None

9. Cumulative 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 the Parent in the Company's Latest Financial Statements, and the Amount of Working Capital in the Latest Financial Statements: Percentage of Total Assets: 76.05% Percentage of Equity Attributable to Owners of the Parent: 109.22% Working Capital Amount: NT$8,285,327 thousand

10. Specific Purpose of Acquisition or Disposal: Portfolio Management

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.