Subsidiaries Dispose of Shanghai Stock Exchange Treasury Repo, Exceeding 20% of Paid-in Capital

Release Date: June 26, 2026 Statement Date: June 25, 2026 Statement Time: 17:26:47 Company Code: 5215 Company Name: Ko-Chia KY

Subject: Announcement regarding subsidiaries Suzhou Jiaji, Kede, Jiacai, Aipulai, Baihong, Jiahuang, and Jiajun collectively disposing of the same securities within one year, exceeding 20% of paid-in capital.

Applicable Clause: Item 20 Factual Date: June 25, 2026

Details: 1. Security Name: 1-day Chinese government bond reverse repo on the Shanghai Stock Exchange (GC001, code 204001) 2. Transaction Date: June 25, 2026 3. Board Approval Date: Not applicable 4. Other Approval Dates: Approval Level: Approved by Chairman June 25, 2026 (Minguo Year 115)

5. Transaction Quantity, Unit Price, and Total Amount: Aipulai: 86,400 units, average rate: 1.510% Baihong: 70,560 units, average rate: 1.510% Jiacai: 386,000 units, average rate: 1.500% Jiahuang: 195,330 units, average rate: 1.505% Jiaji: 115,990 units, average rate: 1.500% Kede: 189,150 units, average rate: 1.500% Jiajun: 330,270 units, average rate: 1.500% Total Amount: RMB 137,376 thousand (approximately NT$631,891 thousand)

6. Gain (or Loss) on Disposal (not applicable for acquisition): Disposal gain: RMB 6,000

7. Relationship with Counterparty: Unrelated party

8. Cumulative Holdings (including this transaction) to date: 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. Proportion of securities investments under Article 3 of the 'Regulations on Acquisition or Disposal of Assets by Publicly Issued Companies' to total assets and equity attributable to owners of parent in the latest financial statements: Ratio to total assets: 12.70% Ratio to shareholders' equity: 17.68% Working capital: NT$2,612,388 thousand

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

11. Dissenting Director Opinions: None

12. Related-Party Transaction: No

13. Counterparty and Relationship with Company: Not applicable

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

15. Previous Material Information Disclosure Date: Not applicable

16. Other Disclosures: None