2323 CMC Magnetics Corporation Announces Acquisition of Marketable Securities

Release Date: August 12, 2026 Statement Date: August 11, 2026 Statement Time: 18:15:23 Company Code: 2323 Company Name: CMC Magnetics Corporation Subject: Announcement of Acquisition of Marketable Securities Applicable Clause: Clause 20 Date of Fact: August 11, 2026

1. Security Name: Sino-American Technology Inc. Common Stock

2. Transaction Date: July 15, 2026 – August 11, 2026

3. Board Approval Date: Not applicable

4. Other Approval Date: Approval Level: Chairman's Decision August 11, 2026

5. Transaction Quantity, Unit Price, and Total Amount: Quantity (in thousands of shares): 616 Unit Price (NT$): 555.44 Total Transaction Amount (NT$): 342,152,583

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 – Quantity, Amount, Ownership Percentage, and Restricted Rights (e.g., Pledge Status): Holding Balance: 327,892 shares, Amount: NT$196,402,655 Ownership Percentage: 0.29%, Restricted Rights: None

9. Cumulative Investment in Marketable Securities under Paragraph 3 of the 'Asset Acquisition and Disposal Rules for Publicly Issued Companies' (including this transaction), as a Percentage of Total Assets and Equity Attributable to Owners of Parent in the Company’s Latest Financial Statements, and the Amount of Working Capital in the Latest Financial Statements: Percentage of Total Assets: 85.81% Percentage of Equity Attributable to Owners of Parent: 123.25% Working Capital Amount: NT$8,285,327 thousand

10. Specific Purpose of Acquisition or Disposal: Investment Portfolio

11. Dissenting Directors’ 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’s Approval or Audit Committee’s Consent: Not applicable

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

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