Huang Hsiang Announces Acquisition of Securities

1. Securities Name: Macronix International Co., Ltd. 2. Transaction Date: 115/3/20~115/4/30 3. Board of Directors Approval Date: Not applicable 4. Other Approval Dates: Approval Level: Chairman's Approval Date: April 30, 115 (2026) 5. Transaction Quantity, Price Per Unit, and Total Transaction Amount: Transaction Quantity: 2,477,000 shares Average Price Per Share: NT$160.17 Total Transaction Amount: NT$396,729,000 6. Disposal Gain (or Loss) (Not applicable for securities acquisition): Not applicable 7. Relationship with the Target Company: None 8. Cumulative holdings of this transaction's securities (including this transaction) up to the present, including quantity, amount, shareholding ratio, and status of rights restrictions (e.g., pledge status): Quantity: 2,177,000 shares Amount: NT$350,598,000 Shareholding Ratio: 0.11% 9. As of the latest financial statements, the proportion of investments in securities listed in Article 3 of the "Regulations Governing Acquisitions or Disposals of Assets by Publicly Issued Companies" (including this transaction) to the company's total assets and equity attributable to owners of the parent company, as well as the amount of working capital in the latest financial statements: Proportion of Total Assets: 0.717% Proportion of Equity Attributable to Owners of the Parent Company: 2.656% Working Capital: NT$14,739,777,000 10. Specific Purpose of Acquisition or Disposal: To enhance the company's capital utilization efficiency 11. Dissenting Board Members' Opinions on This Transaction: Not applicable 12. Is This Transaction a Related Party Transaction? No 13. Transaction Counterparty and its Relationship with the Company: Not applicable 14. Supervisor's Approval or Audit Committee's Approval Date: Not applicable 15. Date of Previous Major Information Announcement for the Same Event: Not applicable 16. Other Matters to be Noted: None Keywords: Major Information