【CMC】Announcement of the Company's Acquisition of Securities

1. Security name: Nanya Technology Common Shares 2. Transaction dates: 2026/5/4~2026/5/12 3. Date of board resolution: Not applicable 4. Other approval date: Approval level: Chairman's approval May 12, 2026 5. Quantity of transaction, price per unit, and total transaction amount: Quantity of transaction (thousand shares): 1,378 Price per unit (NTD): 280.96 Total transaction amount (NTD): 387,156,566 6. Disposal profit (or loss) (not applicable to those acquiring securities): Not applicable 7. Relationship with the target company of the transaction: None 8. As of now, the accumulated quantity, amount, shareholding ratio, and restricted rights (e.g., pledge status) of the securities involved in this transaction (including this transaction): Remaining holdings: 2,893,000 shares, Amount: 658,203,693 NTD Shareholding ratio: 0.08%, Restricted rights: None 9. As of now, the proportion of investment in securities (including this transaction) listed in Article 3 of the "Regulations Governing the Acquisition or Disposal of Assets by Public Companies" to the total assets and equity attributable to owners of the parent company in the latest financial statements, and the amount of working capital in the latest financial statements: Proportion of total assets: 75.89% Proportion of equity attributable to owners of the parent company: 106.30% Amount of working capital: 8,285,327 thousand NTD 10. Specific purpose of acquisition or disposal: Investment portfolio 11. Opinions of dissenting directors on this transaction: None 12. Is this transaction a related party transaction: No 13. Counterparty to the transaction and its relationship with the company: Not applicable 14. Date of approval by supervisors or audit committee: Not applicable 15. Date of previous material information announcement regarding the same event: Not applicable 16. Other matters to be specified: Authorization was granted on 2026/03/31 to authorized traders to conduct securities transactions in the centralized market during the second quarter of 2026.