Win Semiconductors Acquires Phison Shares Worth NT$387.8 Million

Announcement Date: July 24, 2024 Statement Date: July 23, 2024 Statement Time: 17:50:10 Company Code: 2323 Company Name: Win Semiconductors Subject: Announcement of Acquisition of Securities Applicable Clause: Clause 20 Factual Date: July 23, 2024

1. Security Name: Phison Ordinary Shares

2. Transaction Date: July 9, 2025 – July 23, 2025

3. Board Approval Date: Not applicable

4. Other Approval Dates: Approval Level: Chairman Approval July 23, 2024

5. Transaction Quantity, Unit Price, and Total Amount: Transaction Quantity (in thousands of shares): 195 Unit Price (NT$): 1,988.95 Total Transaction Amount (NT$): 387,846,094

6. Gain (or Loss) on Disposal (Not applicable for acquisition of securities): Not applicable

7. Relationship with the Target Company: None

8. Cumulative Holdings of the Security (including this transaction) to Date – Quantity, Amount, Ownership Percentage, and Restricted Rights (e.g., pledge status): Holdings: 197,000 shares, Amount: NT$438,286,283 Ownership Percentage: 0.09%, Rights Restrictions: None

9. Proportion of Securities Investments (including this transaction) under Article 3 of the 'Regulations Governing the Acquisition or Disposal of Assets by Publicly Issued Companies' to the Company's Total Assets and Equity Attributable to Owners of the Parent in the Most Recent Financial Statements, and the Amount of Working Capital in the Most Recent Financial Statements: Percentage of Total Assets: 83.92% Percentage of Equity Attributable to Owners of the Parent: 120.53% Working Capital Amount: NT$8,285,327 thousand

10. Specific Purpose of Acquisition or Disposal: Investment Portfolio

11. Dissenting Directors Regarding This Transaction: None

12. Whether This Transaction is a Related-Party Transaction: No

13. Counterparty and Relationship with the Company: Not applicable

14. Date of Supervisor Approval or Audit Committee Consent: Not applicable

15. Previous Date of Material Information Disclosure on the Same Event: Not applicable

16. Other Disclosures: On June 30, 2024, authorized traders were approved to conduct securities transactions on the centralized market during the third quarter of 2024.