【CMC Magnetics】Announcement of Acquisition of Securities

1. Securities Name: Win Semiconductors Corp. (穩懋) common stock 2. Transaction Dates: 2026/4/27 to 2026/5/4 3. Date approved by the board of directors: Not applicable 4. Other approval dates: Approval level: Chairman's approval on May 4, 2026 (Republic of China calendar year 115) 5. Transaction volume, unit price, and total transaction amount: Transaction volume (thousand shares): 810; Unit price (NTD): 511.46; Total transaction amount (NTD): 414,279,174 6. Disposal gains (or losses) (not applicable to acquisition of securities): Not applicable 7. Relationship with the target company: None 8. As of present, the cumulative holdings of these securities (including this transaction) in terms of quantity, amount, shareholding ratio, and any restricted rights (e.g., pledge status): Holdings balance: 350,000 shares; Amount: NTD 186,792,460; Shareholding ratio: 0.08%; Restricted rights: None 9. As of present, the proportion of investment in securities (including this transaction) as listed in Article 3 of the "Regulations Governing the Acquisition and Disposal of Assets by Public Companies" to the total assets and owners' equity attributable to the parent company in the company's most recent financial report, and the amount of working capital in the most recent financial report: Proportion of total assets: 75.47%; Proportion of owners' equity attributable to the parent company: 105.70%; Working capital amount: NTD 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 significant announcement regarding the same event: Not applicable 16. Other matters that should be stated: Authorized persons were authorized on 2026/03/31 to conduct securities transactions in the centralized trading market during Q2 2026.