[CMC] Announcement of Acquisition of Securities

1. Name of securities: Nanya Tech Common Stock 2. Date of transaction: 2026/5/15~2026/5/15 3. Date of board of directors' approval: N/A 4. Other approval date: Chairman's approval on May 15, 2026 5. Transaction volume, unit price, and total transaction amount: Volume (thousand shares): 1,300. Unit price (NT$): 320.21. Total amount (NT$): 416,267,110 6. Gain (or loss) on disposal: N/A 7. Relationship with the underlying company: None 8. Current cumulative volume, amount, and shareholding percentage: Balance: 3,393,000 shares, Amount: NT$860,413,507. Shareholding ratio: 0.098%, Restricted rights: None 9. Ratio of securities investment to total assets and equity: Total assets ratio: 78.53%. Equity ratio: 112.78%. Operating capital: NT$8,285,327 thousand 10. Concrete purpose: Investment portfolio 11. Dissenting directors: None 12. Is it a related-party transaction: No 13. Counterparty: N/A 14. Approval date: N/A 15. Prior announcement date: N/A 16. Other matters: Authorized authorized traders on 2026/03/31 to conduct securities transactions in the centralized market during Q2 2026.