CMC Announces Disposal of Phison Electronics Shares with 14.37M TWD Profit

1. Name of the security: Phison Electronics Corp. Common Stock 2. Transaction dates: 2026/04/23 ~ 2026/04/27 3. Board approval date: Not applicable 4. Other authorization: Authorized by the Chairman on 2026/04/27 5. Transaction quantity, unit price, and total amount: Quantity: 249,000 shares; Unit price: 1,774.39 TWD; Total amount: 441,823,171 TWD 6. Disposal gain (loss): Profit of 14,366,572 TWD 7. Relationship with the underlying company: None 8. Cumulative holdings after transaction: 420,000 shares (0.19%), valued at 728,426,347 TWD; no encumbrances 9. Ratio of securities investment to assets: 76.43% of total assets; 107.06% of equity attributable to parent; Working capital: 8,285,327,000 TWD 10. Purpose: Investment portfolio adjustment 11. Dissenting opinions: None 12. Related party transaction: No 13. Counterparty: Not applicable (Open market) 14. Audit committee approval: Not applicable 15. Previous announcements: Not applicable 16. Other remarks: Authorized on 2026/03/31 for Q2 2026 open market transactions.