[YEHUI] Announcement of the Board of Directors' Resolution for the 21st and 22nd Treasury Stock Buybacks and Cancellation of Capital Reduction Base Date

1. Date of Board Resolution: 2026/05/04 2. Reason for Capital Reduction: To cancel the shares repurchased by the Company through the 21st and 22nd treasury stock buyback programs, in accordance with Article 28-2 of the Securities Transaction Act. 3. Capital Reduction Amount: 350,000,000 NTD 4. Shares to be Canceled: 35,000,000 shares 5. Capital Reduction Ratio: 1.87% 6. Issued Capital After Reduction: 18,412,402,140 NTD 7. Scheduled Shareholder Meeting Date: Not applicable 8. Estimated Number of Listed Common Shares After Capital Reduction: Not applicable 9. Proportion of Listed Common Shares to Issued Common Shares After Capital Reduction (Number of Listed Common Shares After Reduction / Number of Issued Common Shares After Reduction): Not applicable 10. In cases where the estimated number of listed common shares after capital reduction in the preceding two items is less than 60 million shares and also less than 25%, please explain the measures to address low stock liquidity: Not applicable 11. Capital Reduction Base Date: 2026/05/08 12. Other Matters to be Notified: None. Keywords: Material Information