【Kojia-KY】Announcement by Subsidiaries Suzhou Jiacheng/Kede/Jiacai/Aipulai/Baihong/Jiahuang/Jiajun on Cumulative Acquisition of the Same Securities Reaching 20% of Paid-in Capital Within One Year

1. Securities Name: Shanghai Stock Exchange One-Day National Bond Repurchase GC001, Code 204001 2. Transaction Date: 2026/5/11~2026/5/11 3. Date of Board Approval: Not applicable 4. Other Approval Dates: Approval Level: Chairman's approval May 11, 2026 5. Transaction Volume, Unit Price, and Total Transaction Amount: Aipulai: 83,770 units, average price: 1.000% Baihong: 109,010 units, average price: 1.000% Jiacai: 545,260 units, average price: 1.008% Jiahuang: 192,990 units, average price: 0.993% Jiacheng: 123,750 units, average price: 1.000% Kede: 375,700 units, average price: 1.000% Jiajun: 335,790 units, average price: 1.000% Total Amount: NT$176,627 thousand (approximately NT$814,057 thousand) 6. Disposal Gain (or Loss) (Not applicable for acquisition of securities): Not applicable 7. Relationship with the Transacting Company: Non-related party 8. As of now, cumulative holdings of these securities (including this transaction) in terms of quantity, amount, shareholding ratio, and restricted rights (e.g., pledge status): Aipulai: 83,770 units, average price: 1.000% Baihong: 109,010 units, average price: 1.000% Jiacai: 545,260 units, average price: 1.008% Jiahuang: 192,990 units, average price: 0.993% Jiacheng: 123,750 units, average price: 1.000% Kede: 375,700 units, average price: 1.000% Jiajun: 335,790 units, average price: 1.000% Pledge Status: None 9. As of now, the proportion of investments in securities (including this transaction) listed in Article 3 of the "Regulations Governing the Acquisition and Disposal of Assets by Public Companies" to the company's total assets and equity attributable to parent company owners in the most recent financial report, and the amount of working capital in the most recent financial report: Proportion of total assets: 16.36% Proportion of shareholders' equity: 22.78% Working Capital: NT$2,612,388 thousand 10. Specific Purpose of Acquisition or Disposal: Investment and financial management 11. Opinions of dissenting directors on this transaction: None 12. Is this transaction a related party transaction: No 13. Counterparty and its relationship with the company: Not applicable 14. Date of approval by supervisors or audit committee: Not applicable 15. Date of previous material information announcement for the same event: Not applicable 16. Other matters to be specified: None