1304 Taiwan Union Chemical Corporation

Announcement Date: July 23, 2026 Statement Date: July 22, 2026 Statement Time: 17:15:40 Company Code: 1304 Company Name: Taiwan Union Chemical Corporation Subject: Announcement on Director Change at Key Subsidiary Heng-Kai Global Limited Applicable Clause: Clause 6 Event Date: July 22, 2026

Details: 1. Date of Change: July 22, 2026 2. Type of Personnel Change (Legal Person Director, Legal Person Supervisor, Independent Director, Natural Person Director, or Natural Person Supervisor): Natural Person Director 3. Former Position and Name: Director Miao Feng-Sheng 4. Former Director's Background: Vice Chairman of United Enterprises Holding Co., Ltd., Honorary Chairman of United Linde Gas Industries Co., Ltd. 5. New Position and Name: Director Yu Jing-Chang, Director Lin Hsin-Hung 6. New Directors' Background: - Director Yu Jing-Chang: Director at Xuteng Investment Co., Ltd. - Director Lin Hsin-Hung: General Manager at United Enterprises Holding Co., Ltd. 7. Nature of Change (Please enter 'Resignation', 'Dismissal', 'End of Term', 'Deceased', or 'New Appointment'): - Director Miao Feng-Sheng: Resignation - Director Yu Jing-Chang: New Appointment - Director Lin Hsin-Hung: New Appointment 8. Reason for Change: Resignation and New Appointment 9. Number of Shares Held by New Appointees at Time of Election: 0 10. Original Term (e.g., xx/xx/xx ~ xx/xx/xx): Not Applicable 11. Effective Date of New Appointment: July 22, 2026 12. Director Turnover Rate During Same Term: Not Applicable 13. Independent Director Turnover Rate During Same Term: Not Applicable 14. Supervisor Turnover Rate During Same Term: Not Applicable 15. Is the Change Involving One-Third or More of Directors? (Yes/No): No 16. Other Matters to be Disclosed (If the entity involved is a publicly issued company or above, this material information also meets Article 7, Paragraph 6 of the Enforcement Rules of the Securities and Exchange Act regarding matters significantly affecting shareholders' rights or securities prices): None