[Taiwan Gia-Kuang] Announcement of Board Election for Chairman of Important Subsidiary Taiwan Gia-Kuang Telecommunications

1. Date of board resolution or date of change: May 20, 2026 (115/05/20) 2. Personnel category (Chairman or President): Chairman 3. Name of predecessor: Taiwan Digital Optical Network Co., Ltd. Representative: Tsai Chao-hsun 4. Resume of predecessor: Chairman, Taiwan Gia-Kuang Telecommunications Co., Ltd. 5. Name of successor: Taiwan Digital Optical Network Co., Ltd. Representative: Tsai Chao-hsun 6. Resume of successor: Chairman, Taiwan Gia-Kuang Telecommunications Co., Ltd. 7. Reason for change: Expiration of term (Re-election) 8. Reason for change: Full re-election of directors and supervisors upon expiration of their terms, resulting in a new election of the Chairman. 9. Effective date of appointment: May 20, 2026 (115/05/20) 10. Other matters: None