2323 CMC Magnetics Acquires Securities in Nanya Technology

Announcement Date: June 27, 2026 Statement Date: June 26, 2026 Statement Time: 18:10:21 Company Code: 2323 Company Name: CMC Magnetics Corporation Subject: Announcement of the Company's Acquisition of Securities Applicable Clause: Item 20 Factual Date: June 26, 2026

1. Security Name: Nanya Technology Corporation Common Stock

2. Transaction Date: June 25–26, 2026 (R.O.C. Year 115)

3. Board Approval Date: Not applicable

4. Other Approval Dates: Approval Level: Approved by Chairman Date: June 26, 2026 (R.O.C. Year 115)

5. Transaction Quantity, Unit Price, and Total Amount: Quantity (in thousands of shares): 2,260 Unit Price (NT$): 464.69 Total Transaction Amount (NT$): 1,050,196,238

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: Holding Balance: 2,294,000 shares, Amount: NT$1,058,528,825 Ownership Percentage: 0.07%, Rights Restrictions (e.g., pledge status): None

9. Proportion of Securities Investment (including this transaction) under Article 3 of the "Asset Acquisition and Disposal Regulations for Publicly Issued Companies" to the Company's Total Assets and Equity Attributable to Owners of the Parent in the Most Recent Financial Statements, and the Amount of Working Capital in the Most Recent Financial Statements: Percentage of Total Assets: 85.18% Percentage of Equity Attributable to Owners of the Parent: 122.34% Working Capital Amount: NT$8,285,327 thousand

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

11. Directors' Dissenting Opinions 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: On March 31, 2026 (R.O.C. Year 115), authorized traders were granted permission to conduct securities transactions on the centralized market during the second quarter of 2026.