Ko-Chia-KY Announces Subsidiaries' Cumulative Acquisition of Same Securities Exceeding 20% of Paid-in Capital

1. Security Name: One-day Treasury Reverse Repo GC001, code 204001, listed on the Shanghai Stock Exchange

2. Transaction Date: July 7, 2026 ~ July 7, 2026

3. Board Approval Date: Not applicable

4. Other Approval Dates: Approval Level: Chairman's Approval July 7, 2026 (Minguo Year 115)

5. Transaction Quantity, Unit Price, and Total Transaction Amount: Aiplai: 84,440 units, average rate: 1.435% Baihong: 103,610 units, average rate: 1.430% Jiacai: 433,210 units, average rate: 1.430% Jiahuang: 220,440 units, average rate: 1.430% Jiag: 121,050 units, average rate: 1.430% Kode: 198,250 units, average rate: 1.430% Jiajun: 357,260 units, average rate: 1.430% Total Amount: 151,826 thousand New Taiwan Dollars (approximately 710,426 thousand New Taiwan Dollars)

6. Gain (or Loss) on Disposal (Not applicable for acquisition of securities): Not applicable

7. Relationship with the Counterparty Company: Non-related party

8. Cumulative Holdings of the Security (including this transaction) to Date—Quantity, Amount, Holding Ratio, and Restrictions on Rights (e.g., Pledge Status): Aiplai: 84,440 units, average rate: 1.435% Baihong: 103,610 units, average rate: 1.430% Jiacai: 433,210 units, average rate: 1.430% Jiahuang: 220,440 units, average rate: 1.430% Jiag: 121,050 units, average rate: 1.430% Kode: 198,250 units, average rate: 1.430% Jiajun: 357,260 units, average rate: 1.430% Pledge Status: None

9. Cumulative Securities Investment (including this transaction) under Article 3 of the 'Regulations on the Acquisition or Disposal of Assets by Publicly Issued Companies' as a Percentage of Total Assets and Equity Attributable to Owners of the Parent in the Most Recent Financial Statements, and the Amount of Working Capital in the Most Recent Financial Statements: Percentage of Total Assets: 14.27% Percentage of Shareholders' Equity: 19.88% Working Capital: 2,612,388 thousand New Taiwan Dollars

10. Specific Purpose of the Acquisition or Disposal: Investment and financial management

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's Acknowledgment or Audit Committee Approval: Not applicable

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

16. Other Explanatory Matters: None