Gigastone Announces Cash Dividend Ex-Dividend Date and Related Matters for 2026

1. Date of Board of Directors, Shareholders' Meeting Resolution, or Company Decision: June 11, 2026 (ROC Year 115) 2. Type of Ex-Rights/Ex-Dividend (please enter 'Ex-Rights', 'Ex-Dividend', or 'Ex-Rights and Ex-Dividend'): Ex-Dividend 3. Types and Amounts of Ordinary Share Dividends: Cash dividend of TWD 39,323,466 for ordinary shares, with TWD 0.25011926 distributed per share. 4. Ex-Dividend Trading Day: July 7, 2026 (ROC Year 115) 5. Last Transfer Date: July 8, 2026 (ROC Year 115) 6. Start Date of Transfer Suspension: July 9, 2026 (ROC Year 115) 7. End Date of Transfer Suspension: July 13, 2026 (ROC Year 115) 8. Ex-Dividend Reference Date: July 13, 2026 (ROC Year 115) 9. Final Date for Bond Conversion Application: Not applicable 10. Start Date of Bond Conversion Suspension: Not applicable 11. End Date of Bond Conversion Suspension: Not applicable 12. Ordinary Share Cash Dividend Payment Date: July 31, 2026 (ROC Year 115) 13. Other Matters to be Stated: None