[CMC Magnetics] Announcement of the Company's Disposal of Securities

1. Security Name: TSMC Common Stock 2. Transaction Dates: April 20, 2026 - May 4, 2026 3. Board Approval Date: Not applicable 4. Other Approval Date: Approval Level: Chairman's approval, May 4, 2026 (Republic of China Calendar Year 115) 5. Transaction Quantity, Unit Price, and Total Transaction Amount: Transaction Quantity (thousand shares): 145, Unit Price (NTD): 2,134.81, Total Transaction Amount (NTD): 309,548,105 6. Disposal Gain (or Loss) (Not applicable for acquisition of securities): Disposal Gain: NTD 30,984,822 7. Relationship with the Counterparty: None 8. Cumulative Holdings of these Securities (including this transaction) to Date: Quantity, Amount, Shareholding Ratio, and Restricted Rights (e.g., pledge status): Remaining Holdings: 105,000 shares, Amount: NTD 206,857,598, Shareholding Ratio: 0.0004%, Restricted Rights: None 9. Proportion of Securities Investments (including this transaction) as listed in Article 3 of the "Regulations Governing the Acquisition and Disposal of Assets by Public Companies" to the Company's Total Assets and Equity Attributable to Owners of Parent in the Latest Financial Report, and Working Capital Amount in the Latest Financial Report: Proportion of Total Assets: 75.47%, Proportion of Equity Attributable to Owners of Parent: 105.70%, Working Capital Amount: NTD 8,285,327 thousand 10. Specific Purpose of Acquisition or Disposal: Investment Portfolio 11. Opinions of Dissenting Directors on 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 for the Same Event: Not applicable 16. Other Matters to be Specified: Authorized traders were permitted to conduct securities transactions in the centralized securities market during Q2 2026, as of March 31, 2026.