[KOS] Subsidiary Announces Cumulative Acquisition of Same Securities Reaching 20% of Paid-in Capital Within One Year

1. Securities Name: Shanghai Stock Exchange Overnight Reverse Repurchase Agreement GC001, Code 204001 2. Transaction Date: June 10, 115 ~ June 10, 115 (Republic of China Calendar) 3. Board of Directors Approval Date: Not applicable 4. Other Approval Dates: Approval Level: Chairman's Approval June 10, 115 (Republic of China Calendar) 5. Transaction Quantity, Unit Price, and Total Transaction Amount: Aipu Lai: 86,360 units, average price: 1.090% Bai Hong: 97,510 units, average price: 1.080% Jia Cai: 485,760 units, average price: 1.090% Jia Huang: 219,220 units, average price: 1.075% Koji: 120,920 units, average price: 1.090% Kede: 271,000 units, average price: 1.075% Jia Jun: 352,850 units, average price: 1.090% Total Amount: NT$163,362 thousand (approximately NT$751,421 thousand) 6. Disposal Gain (or Loss) (Not applicable for acquisition of securities): Not applicable 7. Relationship with the Transacting Company: Not a related party 8. Cumulative Quantity, Amount, Shareholding Ratio, and Restrictions (e.g., Pledges) of the Securities Held to Date (Including this Transaction): Aipu Lai: 86,360 units, average price: 1.090% Bai Hong: 97,510 units, average price: 1.080% Jia Cai: 485,760 units, average price: 1.090% Jia Huang: 219,220 units, average price: 1.075% Koji: 120,920 units, average price: 1.090% Kede: 271,000 units, average price: 1.075% Jia Jun: 352,850 units, average price: 1.090% Pledge Status: None 9. To Date, the Proportion of Securities Investments (Including this Transaction) Listed in Article 3 of the "Rules Governing the Acquisition or Disposal of Assets by Publicly Issued Companies" to the Total Assets and Equity Attributable to Owners of the Parent Company in the Most Recent Financial Statements, and the Amount of Working Capital in the Most Recent Financial Statements: Proportion of Total Assets: 15.10% Proportion of Shareholders' Equity: 21.03% 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. Is this Transaction a Related Party Transaction? No 13. Counterparty to the Transaction and its Relationship with the Company: Not applicable 14. Date of Supervisor's Approval or Audit Committee's Consent: Not applicable 15. Date of Previous Announcement of Material Information on the Same Matter: Not applicable 16. Other Explanatory Matters: None