Macronix Announces Disposal of Securities

1. Security Name: Macronix International Co., Ltd.

2. Transaction Date: 115/4/28 ~ 115/6/18

3. Board Approval Date: Not applicable

4. Other Approval Dates: Approval Level: Approved by Chairman June 18, 115 (2026)

5. Transaction Quantity, Unit Price, and Total Amount: Transaction Quantity: 2,050,000 shares Average Price per Share: NT$168.38 Total Transaction Amount: NT$345,179 thousand

6. Gain (or Loss) from Disposal (Not applicable for acquisition of securities): Gain from disposal: NT$18,690 thousand

7. Relationship with the Target Company: None

8. Cumulative Holdings of the Securities (including this transaction) to Date – Quantity, Amount, Shareholding Percentage, and Restricted Rights (e.g., Pledge Status): Quantity: 627,000 shares Amount: NT$100,448 thousand Shareholding Percentage: 0.032%

9. Cumulative Securities Investments (including this transaction) under Article 3 of the 'Asset Acquisition and Disposal Rules for Publicly Issued Companies' as a Percentage of Total Assets and Equity Attributable to Owners of the Parent in the Company’s Latest Financial Statements, and the Amount of Working Capital in the Latest Financial Statements: Percentage of Total Assets: 0.624% Percentage of Equity: 2.279% Working Capital Amount: NT$14,739,777 thousand

10. Specific Purpose of Acquisition or Disposal: To improve the company's capital utilization efficiency

11. Dissenting Director’s Opinion on This Transaction: Not applicable

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 Explanatory Matters: None