CHTMC Announces Acquisition of Marketable Securities

1. Security Name: ADATA Technology Common Stock

2. Transaction Date: 2026/6/4 ~ 2026/6/23

3. Board Approval Date: Not applicable

4. Other Approval Dates: Approval Level: Approved by Chairman Approved on June 23, 2026 (Minguo Year 115)

5. Transaction Quantity, Unit Price, and Total Amount: Quantity (in thousands of shares): 750 Unit Price (NT$): 413.74 Total Transaction Amount (NT$): 310,306,808

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): Holdings: 799,000 shares, Amount: NT$336,797,088 Ownership Percentage: 0.25%, Restricted Rights: None

9. Cumulative Marketable Securities Investment under Article 3 of the 'Asset Acquisition and Disposal Regulations for Publicly Issued Companies' (including this transaction), 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: 82.92% Percentage of Equity Attributable to Owners of Parent: 119.09% Working Capital: NT$8,285,327,000

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