[CMC] Announcement on the Company's Disposal of Marketable Securities

1. Name of the security: Phison Electronics Corp. Common Stock 2. Transaction dates: 2026/5/14~2026/5/18 3. Date of board approval: Not applicable 4. Other approval date: Approval level: Approved by the Chairman, May 18, 2026 5. Transaction quantity, price per unit, and total transaction amount: Transaction quantity (thousand shares): 137 Price per unit (NT$): 2,774.51 Total transaction amount (NT$): 380,108,211 6. Gain (or loss) from disposal (not applicable for acquiring securities): Gain on disposal NT$60,182,445 7. Relationship with the target company: None 8. Cumulative holdings of these securities (including this transaction) to date: quantity, amount, shareholding ratio, and any restrictions (e.g., pledges): Remaining balance: 118,000 shares, Amount: NT$285,479,077, Shareholding ratio: 0.05%, Restrictions: None 9. To date, the ratio of securities investment (including this transaction) under Article 3 of the "Regulations Governing the Acquisition and Disposal of Assets by Public Companies" to total assets and equity attributable to owners of the parent in the most recent financial statements, and the amount of working capital in the most recent financial statements: Ratio to total assets: 76.73%, Ratio to equity attributable to owners of the parent: 110.20%, Working capital amount: NT$8,285,327 thousand 10. Specific purpose of the acquisition or disposal: Investment portfolio 11. Opinions of directors who expressed dissent: None 12. This transaction is a related-party transaction: No 13. Counterparty and its relationship with the company: Not applicable 14. Date of supervisors' approval or audit committee's consent: Not applicable 15. Date of previous material information announcement on the same event: Not applicable 16. Other explanatory matters: Authority was granted on 2026/03/31 to authorized traders to conduct securities transactions in the centralized market during the second quarter of 2026.