Chung Huan Announces Acquisition of Marketable Securities

1. Security Name: China Star Optoelectronics Ordinary Shares

2. Transaction Date: 115/7/7 ~ 115/7/9

3. Board Approval Date: Not applicable

4. Other Approval Dates: Approval Level: Approved by Chairman July 9, 115 (2026)

5. Transaction Quantity, Unit Price, and Total Amount: Transaction Quantity (in thousands of shares): 988 Unit Price (NT$): 435.98 Total Transaction Amount (NT$): 430,752,058

6. Gain (or Loss) on Disposal (Not applicable for acquisition of marketable 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 Rights Restrictions (e.g., Pledge Status): Holding Balance: 2,407,000 shares, Amount: NT$1,188,596,076 Ownership Percentage: 1.69%, Rights Restrictions: None

9. Cumulative Marketable Securities Investment (including this transaction) under Article 3 of the 'Regulations Governing the Acquisition or Disposition of Assets by 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: 86.37% Percentage of Equity Attributable to Owners of the Parent: 124.04% Working Capital Amount: NT$8,285,327 thousand

10. Specific Purpose of the Acquisition or Disposition: Investment Portfolio

11. Dissenting Directors’ 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’s Acknowledgment or Audit Committee’s Approval: Not applicable

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

16. Other Explanatory Matters: On 115/06/30, authorized trading personnel were granted authority to conduct marketable securities transactions in the centralized market during the third quarter of 115 (2026).