Subsidiaries Dispose of Shanghai Stock Exchange 1-Day Treasury Reverse Repo, Cumulative Disposal Exceeds 20% of Paid-in Capital

Announcement Date: July 11, 2026 Statement Date: July 10, 2026 Statement Time: 15:38 Company Code: 5215 Company Name: Ko-Chia KY

Subject: Announcement regarding cumulative disposal of securities exceeding 20% of paid-in capital within one year by subsidiaries Suzhou Jiaji, Kede, Jiacai, Apex, Baihong, Jiahuang, and Jiajun.

Applicable Clause: Clause 20 Factual Date: July 10, 2026

Details:

1. Security Name: Shanghai Stock Exchange 1-day Treasury Reverse Repo GC001, Code 204001

2. Transaction Date: July 10, 2026 ~ July 10, 2026

3. Board Approval Date: Not applicable

4. Other Approval Dates: Approval Level: Chairman Approval July 10, 2026 (Minguo Year 115)

5. Transaction Quantity, Unit Price, and Total Transaction Amount:

- Apex: 84,450 units, average rate: 1.440% - Baihong: 103,610 units, average rate: 1.415% - Jiacai: 433,240 units, average rate: 1.400% - Jiahuang: 220,440 units, average rate: 1.400% - Jiaji: 121,050 units, average rate: 1.400% - Kede: 205,260 units, average rate: 1.400% - Jiajun: 351,790 units, average rate: 1.400%

Total Amount: 151,902 thousand NTD (approximately TWD 710,784 thousand)

6. Disposal Gain (or Loss) (not applicable for acquisition): Disposal gain: RMB 17 thousand

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

8. Cumulative Holdings of the Security (including this transaction) to Date by Each Subsidiary, Amount, Ownership Ratio, and Restricted Rights (e.g., Pledge Status):

- Suzhou Apex: None - Suzhou Baihong: None - Suzhou Jiacai Electronics: None - Suzhou Jiahuang Electronics: None - Suzhou Jiaji Electronics: None - Suzhou Kede: None - Chongqing Jiajun: None

Pledge Status: 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 Most Recent Financial Statements, and Amount of Working Capital:

- Percentage of Total Assets: 14.28% - Percentage of Shareholders' Equity: 19.89% - Working Capital: TWD 2,612,388 thousand

10. Specific Purpose of 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 Relationship with the Company: Not applicable

14. Supervisor Approval or Audit Committee Consent Date: Not applicable

15. Previous Material Information Announcement Date for the Same Event: Not applicable

16. Other Explanatory Matters: None