3557 Kawei Announces Ex-Dividend Benchmark Date

Announcement Date: June 19, 2026 Statement Date: June 18, 2026 Statement Time: 14:57:30 Company Code: 3557 Company Name: Kawei Subject: Announcement of the establishment of the ex-dividend benchmark date Relevant Clause: Clause 14 Factual Date: June 18, 2026

Details: 1. Date of Board Resolution, Shareholders' Meeting, or Company Decision: June 18, 2026 2. Type of Ex-Rights/Ex-Dividend (please specify 'Ex-Rights', 'Ex-Dividend', or 'Ex-Rights and Ex-Dividend'): Ex-Dividend 3. Type and Amount of Ordinary Share Dividend: NT$25,294,630 (NT$0.3 per share) 4. Ex-Dividend Trading Day: July 6, 2026 5. Last Transfer Date: July 7, 2026 6. Start Date of Transfer Suspension: July 8, 2026 7. End Date of Transfer Suspension: July 12, 2026 8. Ex-Dividend Benchmark Date: July 12, 2026 9. Final Date for Bond Conversion Application: N/A 10. Start Date of Bond Conversion Suspension: N/A 11. End Date of Bond Conversion Suspension: N/A 12. Ordinary Share Cash Dividend Payment Date: July 31, 2026 13. Other Matters to be Clarified: Final Purchase Date for Dividend Eligibility: July 3, 2026