E-Sonic Announces Ex-Dividend Date for Cash Dividend Distribution

Announcement Date: June 25, 2026 (Minguo 115) Statement Date: June 24, 2026 (Minguo 115) Statement Time: 06:45:02 Company Code: 3024 Company Name: E-Sonic Subject: Announcement of the Establishment of the Ex-Dividend Date Applicable Clause: Clause 14 Factual Event Date: June 24, 2026 (Minguo 115)

Details: 1. Date of Board, Shareholders' Meeting Resolution or Company Decision: June 24, 2026 (Minguo 115) 2. Type of Rights/Dividend Adjustment (please enter 'Rights Adjustment', 'Dividend Adjustment', or 'Rights and Dividend Adjustment'): Dividend Adjustment 3. Type and Amount of Ordinary Share Dividend: Cash dividend totaling NT$60,974,649 (NT$0.22 per share) 4. Ex-Rights (Dividend) Trading Day: July 9, 2026 (Minguo 115) 5. Last Transfer Date: July 12, 2026 (Minguo 115) 6. Start Date of Transfer Suspension: July 13, 2026 (Minguo 115) 7. End Date of Transfer Suspension: July 17, 2026 (Minguo 115) 8. Ex-Rights (Dividend) Benchmark Date: July 17, 2026 (Minguo 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. Cash Dividend Payment Date for Ordinary Shares: August 10, 2026 (Minguo 115) 13. Other Matters to be Disclosed: None