[KOGA-KY] Announcement Regarding Subsidiaries Suzhou Kaji/Koto/Kajie/Apply/Hyakukou/Kajun Cumulatively Acquiring Securities Reaching 20% of Paid-in Capital

1. Security Name: Overnight treasury reverse repurchase GC001 on the Shanghai Stock Exchange, code 204001 2. Transaction Date: April 14, 2026 ~ April 14, 2026 3. Board of Directors Approval Date: Not applicable 4. Other Approval Dates: Approval Level: Need to tell the court that the stock is invested by Jiajing Investment April 14, 2026 5. Transaction Quantity, Price Per Unit, and Total Transaction Amount: Apply: 55,410 units, average price: 1.400% Hyakukou: 104,910 units, average price: 1.400% Kajie: 1,139,540 units, average price: 1.400% Kajun: 163,850 units, average price: 1.400% Kajie: 117,640 units, average price: 1.400% Koto: 430,320 units, average price: 1.400% Kajun: 309,470 units, average price: 1.400% Total Amount: 232,114 thousand yuan (approximately NT$1,104,247 thousand) 6. Disposal Profit (or Loss) (Not applicable for acquisition of securities): Not applicable 7. Relationship with the Company of the Transaction Target: Not a related party 8. Accumulated Quantity, Amount, Shareholding Ratio, and Restrictions (e.g., pledges) of the Transaction Securities Held to Date (including this transaction): Apply: 55,410 units, average price: 1.400% Hyakukou: 104,910 units, average price: 1.400% Kajie: 1,139,540 units, average price: 1.400% Kajun: 163,850 units, average price: 1.400% Kajie: 117,640 units, average price: 1.400% Koto: 430,320 units, average price: 1.400% Kajun: 309,470 units, average price: 1.400% Pledged situation: None 9. To date, according to Article 3 of the "Regulations Governing the Acquisition or Disposal of Assets by Public Companies", the proportion of securities investments (including this transaction) in the company's latest financial statements' total assets and equity attributable to the parent company, and the operating funds in the latest financial statements: Proportion of total assets: 23.37% Proportion of shareholder equity: 31.03% Operating funds: NT$2,515,979 thousand 10. Specific purpose of acquisition or disposal: Investment and financial management 11. Opinion of dissenting directors regarding this transaction: None 12. Is this transaction a related party transaction? No 13. Transaction counterparty and its relationship with the company: Not applicable 14. Date of approval by supervisors or audit committee: Not applicable 15. Date of previous announcement of material information on the same matter: Not applicable 16. Other statements: None