[CMC] Announcement on the Acquisition of Securities

1. Name of Security: ASUS Common Stock 2. Transaction Period: 114/11/13 ~ 115/6/4 3. Date of Board Approval: Not applicable 4. Other Approval Date: Chairman approval, June 4, 2026 5. Quantity, Price per unit, and Total amount: Quantity: 540,000 shares Price per unit: 632.94 NTD Total amount: 341,786,149 NTD 6. Profit/Loss: Not applicable 7. Relation to the target company: None 8. Cumulative holdings including this transaction: Current balance: 60,000 shares, 54,675,686 NTD Shareholding ratio: 0.008% 9. Asset acquisition/disposal standards check: Percentage of total assets: 79.61% Percentage of equity attributable to owners of the parent: 114.34% Working capital: 8,285,327,000 NTD 10. Purpose: Investment portfolio 11. Dissenting opinions: None 12. Related party transaction: No 13. Counterparty relationship: Not applicable 14. Audit committee agreement date: Not applicable 15. Date of prior announcement: Not applicable 16. Other notes: Authorized traders were granted authority on March 31, 2026, to conduct securities transactions in the centralized exchange market during Q2 2026.