2323 CMC Magnetics: Announcement of Securities Acquisition

Announcement Date: 2026/05/16 Speaker Date: 2026/05/15 Speaker Time: 17:51:32 Company Code: 2323 Company Name: CMC Magnetics Subject: Announcement of acquisition of securities by the Company Clause: No. 20 Date of Event: 2026/05/15 Explanation: 1. Name of Securities: Quanta Computer Common Stock 2. Date of Transaction: 2025/9/16 ~ 2026/5/15 3. Board Approval Date: Not applicable 4. Other Approval Date: Approved by the Chairman on 2026/05/15 5. Quantity, Price per unit, and Total Transaction Amount: Quantity: 1,120,000 shares, Price per unit: 289.90 TWD, Total: 324,687,977 TWD 6. Disposal Gain/Loss: Not applicable 7. Relationship with the issuer: None 8. Cumulative holdings including this transaction: 160,000 shares, Amount: 49,820,699 TWD, Holding ratio: 0.004%, Encumbrance: None 9. Ratio of investments to total assets/equity: 78.53% of total assets, 112.78% of equity attributed to owners of parent, Working capital: 8,285,327,000 TWD 10. Purpose of transaction: Investment portfolio 11. Objection by directors: None 12. Related party transaction: No 13. Counterparty relationship: Not applicable 14. Supervisor/Audit Committee date: Not applicable 15. Prior major news: Not applicable 16. Other notes: Authorized on 2026/03/31 for transaction during Q2 2026.