Gemtek (4906) Announces Changes to Audit Committee Members

Announcement Date: May 25, 2026 Company Code: 4906 Company Name: Gemtek

Subject: Announcement of changes in the company's audit committee members

Date of event: May 25, 2026

Explanation: 1. Date of change: May 25, 2026 2. Name of functional committee: Audit Committee 3. Name of predecessor: N/A 4. Brief resume of predecessor: N/A 5. Name of new appointee: Tseng Hsiang-Chi 6. Brief resume of new appointee: Professor, Department of Physics, Chung Yuan Christian University 7. Status of change: New appointment 8. Reason for change: By-election of one independent director at the annual shareholders' meeting 9. Original term of office: May 28, 2025 ~ May 27, 2028 10. Effective date of new appointment: May 25, 2026 11. Other matters to be specified: None