CMC Announces Disposal of Nanya Technology Shares with NT$14.07 Million Gain

Release Date: June 26, 2026 Statement Date: June 25, 2026 Statement Time: 17:46:28 Company Code: 2323 Company Name: CMC Subject: Announcement of Disposal of Securities Relevant Clause: Clause 20 Factual Date: June 25, 2026

Details: 1. Security Name: Nanya Technology Ordinary Shares

2. Transaction Date: June 25, 2026 ~ June 25, 2026

3. Board Approval Date: Not applicable

4. Other Approval Dates: Approval Level: Approved by Chairman June 25, 2026

5. Transaction Quantity, Unit Price, and Total Transaction Amount: Transaction Quantity (in thousands of shares): 860 Unit Price (NT$): 472.88 Total Transaction Amount (NT$): 406,677,182

6. Disposal Gain (or Loss) (Not applicable for acquisition of securities): Disposal Gain: NT$14,074,821

7. Relationship with the Target Company: None

8. Cumulative Holdings of the Security (including this transaction) to Date – Quantity, Amount, Ownership Percentage, and Rights Restrictions (e.g., Pledge): Remaining Holdings: 1,254,000 shares, Amount: NT$566,198,126 Ownership Percentage: 0.04%, Rights Restrictions: None

9. Cumulative Securities Investments (including this transaction) under Article 3 of the 'Regulations Governing the Acquisition or Disposal of Assets by Publicly Issued Companies' as a Percentage of Total Assets and Equity Attributable to Owners of the Parent in the Company’s Most Recent Financial Statements, and the Amount of Working Capital in the Most Recent Financial Statements: Percentage of Total Assets: 82.20% Percentage of Equity Attributable to Owners of the Parent: 118.06% Working Capital Amount: NT$8,285,327 thousand

10. Specific Purpose of Acquisition or Disposal: Investment Portfolio

11. Directors Who Objected to This Transaction: None

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

13. Counterparty and Relationship with the Company: Not applicable

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

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

16. Other Disclosures: On March 31, 2026, authorized traders were approved to conduct securities transactions in the centralized market during Q2 2026