CMC Magnetics (2323) Announces Disposal of Phison Shares, Realizing NT$60.18 Million in Profit

Announcement Date: 2026/05/19 Spokesperson Date: 2026/05/18 Spokesperson Time: 18:06:06 Company Code: 2323 Company Name: CMC Magnetics Subject: Announcement of the company's disposal of securities

1. Name of the security: Phison Electronics Corp. common stock 2. Transaction period: 2026/5/14~2026/5/18 3. Date of board approval: Not applicable 4. Other approval date: Approval level: Chairman approval on May 18, 2026 5. Transaction volume, price per unit, and total transaction amount: Transaction volume (thousand shares): 137 Price per unit (NT$): 2,774.51 Total transaction amount (NT$): 380,108,211 6. Disposal profit (or loss): Disposal profit of NT$60,182,445 7. Relationship with the target company: None 8. Cumulative holding of this security to date (including this transaction): quantity, amount, holding ratio, and any restrictions (e.g., pledges): Remaining balance: 118,000 shares, Amount: NT$285,479,077 Holding 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 the 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. Dissenting opinions from directors: None 12. This transaction is a related-party transaction: No 13. Counterparty and its relationship with the company: Not applicable 14. Date of approval by supervisors or audit committee: Not applicable 15. Date of previous material information announcement on the same event: Not applicable 16. Other explanatory matters: Authorized traders were approved on 2026/03/31 to trade securities on the centralized market during the second quarter of 2026.