8467 Polys-KY

Announcement Date: July 7, 2026 Statement Date: July 6, 2026 Statement Time: 15:24:58 Company Code: 8467 Company Name: Polys-KY Subject: Announcement of the ex-dividend reference date for the company's Q4 2025 cash dividend Applicable Clause: Clause 14 Factual Date: July 6, 2026

Details: 1. Date of Board, Shareholders' Meeting Resolution or Company Decision: July 6, 2026 2. Type of Ex-Rights/Ex-Dividend (please enter 'Ex-Rights', 'Ex-Dividend', or 'Ex-Rights and Ex-Dividend'): Ex-Dividend 3. Ordinary Share Dividend Type and Amount: Cash dividend, NT$145,120,725 (NT$3.0 per share) 4. Ex-Dividend Trading Date: July 31, 2026 5. Last Transfer Date: August 3, 2026 6. Start Date of Transfer Suspension: August 4, 2026 7. End Date of Transfer Suspension: August 8, 2026 8. Ex-Dividend Reference Date: August 8, 2026 9. Final Application Date for Bond Conversion: July 10, 2026 10. Start Date of Bond Conversion Suspension: July 14, 2026 11. End Date of Bond Conversion Suspension: August 8, 2026 12. Ordinary Share Cash Dividend Payment Date: September 29, 2026 13. Whether Part or All of the Cash Dividend is Paid in Foreign Currency (please enter 'Yes' or 'No'): No 14. Currency for Foreign Cash Dividend: Not applicable 15. Recipients of Foreign Cash Dividend: Not applicable 16. Method for Determining Exchange Rate for Foreign Cash Dividend: Not applicable 17. Other Matters to be Clarified: (1) To align with the company's dividend distribution process, the bond conversion suspension period is set from July 14, 2026, to August 8, 2026. Bondholders wishing to apply for conversion must complete the conversion procedures with their brokerage firm by the business day prior to the start of the suspension period (i.e., July 10, 2026). (2) The cash dividend is expected to be distributed on September 29, 2026.