Announcement of Chairman Appointment by the Board of Taiwan Optical Telecom (6464)

Announcement of Chairman Appointment by the Board of Taiwan Optical Telecom (6464)

- Publication Date: May 21, 2026 - Announcement Date: May 20, 2026 - Announcement Time: 16:48:59 - Company Ticker: 6464 - Company Name: Taiwan Optical Telecom - Subject: Appointment of Chairman by the Board of Taiwan Optical Telecom, a key subsidiary - Clause: Article 6 - Effective Date: May 20, 2026

### Explanation: 1. Date of Board Resolution or Change: May 20, 2026 2. Position: Chairman 3. Name of Predecessor: Tsai Chao-Hsun (Representative of Taiwan Digital Optical Technology Co., Ltd.) 4. Brief Biography of Predecessor: Chairman of Taiwan Optical Telecom Co., Ltd. 5. Name of Successor: Tsai Chao-Hsun (Representative of Taiwan Digital Optical Technology Co., Ltd.) 6. Brief Biography of Successor: Chairman of Taiwan Optical Telecom Co., Ltd. 7. Reason for Change: Expiration of term 8. Cause of Change: Comprehensive re-election due to the expiration of terms for directors and supervisors, leading to the re-election of the Chairman. 9. Effective Date of New Term: May 20, 2026 10. Other: None