[Unimicron] Announcement of Board Resolution to Redeem and Cancel Restricted Employee Stock Awards to Reduce Capital

1. Date of Board of Directors' Resolution: 2026/04/28 2. Reason for Capital Reduction: Due to employees not meeting the vesting conditions for previously granted restricted employee stock awards, the company will redeem these shares and process a capital reduction by cancellation. 3. Capital Reduction Amount: NTD 3,735,000 4. Shares to be Cancelled: 373,500 shares 5. Capital Reduction Ratio: 0.02% 6. Capital After Reduction: NTD 15,751,576,970 7. Scheduled Date of Shareholders' Meeting: Not applicable 8. Estimated Number of Listed Common Shares After Capital Reduction and New Share Listing: Not applicable 9. Ratio of Estimated Listed Common Shares After Capital Reduction and New Share Listing to Issued Common Shares (Listed Common Shares After Capital Reduction / Issued Common Shares After Capital Reduction): Not applicable 10. For cases where the estimated number of listed common shares after capital reduction in the preceding two items is less than 60 million shares and less than 25%, please explain the countermeasures for low stock liquidity: Not applicable 11. Capital Reduction Record Date: 2026/05/01 12. Other Matters to be Specified: None