2323 CMC Magnetics Acquires Huagang Light Shares to Expand Investment Portfolio

Release Date: July 10, 2026 Statement Date: July 9, 2026 Statement Time: 17:58:53 Company Code: 2323 Company Name: CMC Magnetics Subject: Announcement of the Company's Acquisition of Securities Applicable Clause: Clause 20 Date of Fact: July 9, 2026

1. Security Name: Huagang Light Ordinary Shares

2. Transaction Date: July 7–9, 2026

3. Board Approval Date: Not applicable

4. Other Approval Date: Approval Level: Approved by Chairman July 9, 2026

5. Transaction Quantity, Unit Price, and Total Amount: Transaction Quantity (in thousands of shares): 988 Unit Price (NT$): 435.98 Total Transaction Amount (NT$): 430,752,058

6. Gain (or Loss) on Disposal (not applicable for acquisition of securities): Not applicable

7. Relationship with the Target Company: None

8. Cumulative Holdings of the Security (including this transaction) to Date: Balance Held: 2,407,000 shares, Amount: NT$1,188,596,076 Ownership Percentage: 1.69%, Rights Restrictions (e.g., pledge status): None

9. Proportion of Securities Investment (including this transaction) under Article 3 of the 'Asset Acquisition and Disposal Rules for Publicly Issued Companies' to the Company's Latest Financial Statements' Total Assets and Equity Attributable to Owners of the Parent, and the Amount of Working Capital in the Latest Financial Statements: Percentage of Total Assets: 86.37% Percentage of Equity Attributable to Owners of the Parent: 124.04% Working Capital Amount: NT$8,285,327 thousand

10. Specific Purpose of Acquisition or Disposal: Investment portfolio management

11. Dissenting Director's Opinion on This Transaction: None

12. Whether This Transaction is a Related-Party Transaction: No

13. Counterparty and Its Relationship with the Company: Not applicable

14. Date of Supervisor Approval or Audit Committee Consent: Not applicable

15. Previous Date of Material Information Disclosure on the Same Event: Not applicable

16. Other Explanatory Matters: Authorized designated traders on June 30, 2026 to conduct securities transactions in the centralized market during the third quarter of 2026.