【KOGA-KY】Announcement by Subsidiaries Suzhou Jiaji / Kode / Jia Cai / Apply / Baihong / Jiahung / Jiajun on Cumulative Acquisition of the Same Marketable Securities Reaching 20% of Paid-in Capital Within One Year

1. Securities name: Shanghai Stock Exchange one-day reverse repurchase GC001, code 204001 2. Transaction date: 2026/5/12 ~ 2026/5/12 3. Date of board resolution: Not applicable 4. Other approval dates: Approval level: Chairman's approval May 12, 2026 5. Transaction quantity, unit price, and total transaction amount: Apply: 83,770 units, average price: 0.910% Baihong: 109,010 units, average price: 0.915% Jia Cai: 545,280 units, average price: 0.920% Jiahung: 193,000 units, average price: 0.915% Jiaji: 123,110 units, average price: 0.915% Kode: 375,710 units, average price: 0.925% Jiajun: 335,790 units, average price: 0.920% Total amount: NT$176,567 thousand (approximately NT$813,781 thousand) 6. Disposal gain (or loss) (not applicable for acquisition of marketable securities): Not applicable 7. Relationship with the transaction target company: Non-related party 8. As of the current date, the quantity, amount, shareholding ratio, and restrictions on rights (e.g., pledges) of the cumulative holdings of these securities (including this transaction): Apply: 83,770 units, average price: 0.910% Baihong: 109,010 units, average price: 0.915% Jia Cai: 545,280 units, average price: 0.920% Jiahung: 193,000 units, average price: 0.915% Jiaji: 123,110 units, average price: 0.915% Kode: 375,710 units, average price: 0.925% Jiajun: 335,790 units, average price: 0.920% Pledge status: None 9. As of the current date, the proportion of investment in marketable securities (including this transaction) listed in Article 3 of the 'Regulations Governing the Acquisition or Disposal of Assets by Public Companies' to the total assets and equity attributable to owners of the parent in the most recent financial report, and the amount of working capital in the most recent financial report: Proportion of total assets: 16.35% Proportion of shareholders' equity: 22.78% Working capital: NT$2,612,388 thousand 10. Specific purpose of acquisition or disposal: Investment and wealth management 11. Opinions of dissenting directors on this transaction: None 12. This transaction is 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 on the same event: Not applicable 16. Other matters to be specified: None