Announcement of Subsidiaries' Cumulative Disposal of Securities Exceeding 20% of Paid-in Capital

Disclosure Date: June 27, 2026 Statement Date: June 26, 2026 Statement Time: 16:27:49 Company Code: 5215 Company Name: Ko-Chia KY

Subject: Announcement on behalf of subsidiaries Suzhou Jiaji, Kede, Jiacai, Aipulai, Baihong, Jiahuang, and Jiajun

Public announcement of cumulative disposal of the same security exceeding 20% of paid-in capital within one year

Applicable Clause: Item 20 Factual Date: June 26, 2026

Details:

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

2. Transaction Date: June 26, 2026 ~ June 26, 2026

3. Board Approval Date: Not applicable

4. Other Approval Date: Approval Level: Approved by Chairman June 26, 2026

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

- Aipulai: 86,400 units, average rate: 1.475% - Baihong: 70,560 units, average rate: 1.470% - Jiacai: 386,020 units, average rate: 1.470% - Jiahuang: 195,340 units, average rate: 1.470% - Jiaji: 115,990 units, average rate: 1.475% - Kede: 189,160 units, average rate: 1.475% - Jiajun: 327,280 units, average rate: 1.475%

Total Amount: NT$137,092 thousand (approximately RMB 630,585 thousand)

6. Gain (or Loss) from Disposal (not applicable for acquisition): Disposal gain: RMB 16 thousand

7. Relationship with the Counterparty Company: Unrelated party

8. Cumulative holdings of the security (including this transaction) to date, including quantity, amount, ownership percentage, and restricted rights (e.g., pledge status):

- Suzhou Aipulai: 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 under Article 3 of the 'Asset Acquisition and Disposal Rules for Publicly Issued Companies' (including this transaction) 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: 12.67% - Percentage of shareholders' equity: 17.65% - Working capital: NT$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. Is this 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: None