[CMC Magnetics] Announcement on the company's acquisition of marketable securities

1. Securities name: Shing Dar Co., Ltd. common stock 2. Transaction dates: 2026/4/30~2026/5/8 3. Date of approval by the board of directors: Not applicable 4. Other approval dates: Approval level: Chairman's approval, May 8, 2026 5. Quantity, unit price, and total transaction amount: Transaction quantity (thousands of shares): 994 Unit price (NT$): 375.08 Total transaction amount (NT$): 372,828,175 6. Gain (or loss) on disposal (not applicable to acquisition of marketable securities): Not applicable 7. Relationship with the transacting company: None 8. As of now, total holding of these securities (including this transaction), amount, shareholding ratio, and restrictions on rights (e.g., pledge status): Remaining holding: 467,000 shares, Amount: NT$ 177,207,380 Shareholding ratio: 0.30%, Restrictions on rights: None 9. As of now, the ratio of marketable securities investments (including this transaction) listed in Article 3 of the "Regulations Governing the Acquisition or Disposal of Assets by Public Companies" to the company's total assets and equity attributable to owners of the parent company in the latest financial statements, and the amount of working capital in the latest financial statements: Ratio to total assets: 76.88% Ratio to equity attributable to owners of the parent company: 107.68% Working capital amount: NT$ 8,285,327 thousand 10. Specific purpose of acquisition or disposal: Investment portfolio 11. Opinions of dissenting directors for this transaction: None 12. Is this 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 matters to be specified: The authorized trader was authorized on 2026/03/31 to conduct marketable securities transactions in the centralized trading market during Q2 2026.