CMC: Announcement of the Company's Acquisition of Securities

1. Securities name: Phison ordinary shares 2. Transaction dates: 2026/4/30~2026/5/5 3. Date of board approval: Not applicable 4. Other approval dates: Approval level: Chairman's approval, May 5, 2026 5. Transaction volume, unit price, and total transaction amount: Transaction volume (thousand shares): 152, Unit price (NTD): 2,000.60, Total transaction amount (NTD): 304,090,678 6. Disposal profit (or loss) (not applicable to acquisition of securities): Not applicable 7. Relationship with the target company: None 8. As of now, the cumulative quantity, amount, shareholding ratio, and restricted rights (e.g., pledge) of the securities held (including this transaction): Remaining holdings: 164,000 shares, Amount: NTD 299,835,604, Shareholding ratio: 0.08%, Restricted rights: None 9. As of now, the ratio of investment in securities (including this transaction) listed in Article 3 of the "Regulations Governing the Acquisition and Disposal of Assets by Public Companies" to the total assets and equity attributable to owners of the parent in the company's most recent financial report, and the amount of working capital in the most recent financial report: Ratio to total assets: 74.58%, Ratio to equity attributable to owners of the parent: 104.47%, Working capital amount: NTD 8,285,327 thousand 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 and its relationship with the company: Not applicable 14. Date of approval by supervisors or audit committee: Not applicable 15. Date of previous major announcement on the same event: Not applicable 16. Other matters to be specified: Authorized eligible traders on 2026/03/31 to conduct securities transactions in the centralized trading market during Q2 2026.