PHOTOMASK Announces Board Appointment of Compensation Committee Members

1. Date of Change: 2026/06/26 2. Name of Functional Committee: Compensation Committee 3. Former Members: Wang Wei-Chen (Independent Director), Cheng Huan-Kuei (Independent Director), Chan Hui-Fen (Independent Director), Chou Chi-Jen 4. Former Members' Background: Wang Wei-Chen: Independent Director, PHOTOMASK Corporation Cheng Huan-Kuei: Independent Director, PHOTOMASK Corporation Chan Hui-Fen: Independent Director, PHOTOMASK Corporation Chou Chi-Jen: Director, Jiaotong University Szu-Yuan Foundation 5. New Members: Wang Wei-Chen (Independent Director), Yang Fang-Xiang (Independent Director), Peng Ying-Hui (Independent Director) 6. New Members' Background: Wang Wei-Chen: Independent Director, PHOTOMASK Corporation Yang Fang-Xiang: Independent Director, PHOTOMASK Corporation Peng Ying-Hui: Independent Director, PHOTOMASK Corporation 7. Nature of Change: Term Expiration 8. Reason for Change: Board Appointment 9. Previous Term: 2023/05/24 ~ 2026/05/23 10. Effective Date of New Appointment: 2026/06/26 11. Other Matters to be Disclosed: None.