Diwei West Announces Ex-Dividend Date for Ordinary Shares

1. Date of Board, Shareholders' Meeting Resolution or Company Decision: 06/24/2026 2. Type of Rights/Dividend (please enter 'Rights', 'Dividend', or 'Rights & Dividend'): Dividend 3. Type and Amount of Ordinary Share Dividend: Cash dividend of NT$375,477,457 for ordinary shares, with NT$1.2 per share distributed 4. Ex-Rights/Dividend Trading Day: 07/16/2026 5. Last Transfer Date: 07/19/2026 6. Start Date of Transfer Suspension: 07/20/2026 7. End Date of Transfer Suspension: 07/24/2026 8. Ex-Rights/Dividend Benchmark Date: 07/24/2026 9. Final Application Date for Bond Conversion: 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 Distribution Date: 08/14/2026 13. Other Matters to be Disclosed: (1) The ordinary share cash dividend is scheduled to be distributed starting August 14, 2026, through the company's share agent via bank transfer or registered mail using 'non-negotiable' checks. For dividend amounts insufficient for bank transfer or registered mail check delivery, checks will be sent by regular mail. (2) Ordinary share cash dividends will be paid to the nearest New Taiwan Dollar (amounts below one dollar will be disregarded, and the total fractional amount will be recorded as other income of the company). Bank transfer fees and postage will be borne by shareholders. Additionally, withholding taxes and supplementary insurance premiums deducted at source will be directly withheld from shareholders' cash dividend payments.