4566 Sisyu Industrial Announces Board Resolution on Domestic Third Unsecured Convertible Bonds Conversion to Common Stock

Release Date: August 11, 2026 Statement Date: August 10, 2026 Statement Time: 18:40 Company Code: 4566 Company Name: Sisyu Industrial Co., Ltd.

Subject: Board Resolution on Benchmark Date for Capital Increase via Conversion of Domestic Third Unsecured Convertible Bonds into Common Stock

Applicable Clause: Clause 11 Factual Date: August 10, 2026

Details: 1. Board Resolution Date: August 10, 2026 2. Source of Capital Increase: Conversion of domestic third unsecured convertible bonds. 3. Use of blanket registration for new share issuance (if yes, specify planned issuance period; if no): No 4. Total issuance amount and number of shares (excluding employee allocation for surplus or reserve capitalization): Issuance of 97,955 new common shares, with a total par value of NT$979,550. 5. Issuance amount and number of shares under blanket registration: Not applicable 6. Remaining amount and number of shares after this issuance under blanket registration: Not applicable 7. Par value per share: NT$10 8. Issuance price: Conversion price of NT$49.00 per share 9. Number of shares subscribed by employees or allocated amount: Not applicable 10. Number of publicly offered shares: Not applicable 11. Subscription or free allocation ratio for existing shareholders: Not applicable 12. Handling method for fractional shares and unclaimed shares after deadline: Not applicable 13. Rights and obligations of the newly issued shares: Same as existing common shares 14. Use of capital raised from this increase: Not applicable 15. Rationality and necessity of fundraising after cash reduction (applicable if cash reduction was conducted in the current or previous year): Not applicable 16. Other Matters to be Stated: (1) The benchmark date for capital increase is set as August 10, 2026.