Rainbow-Y Announces Members of the 2nd Sustainability Committee and Appointment of Convener

1. Date of Change: 2026/06/22 2. Name of Functional Committee: Sustainability Committee 3. Former Members: (1) Tseng Kuang-Hua (2) Chien Chia-Ying (3) Chin Jui-Ting (4) Huang Chen-Yuan (5) Cheng Yu-Feng 4. Former Members' Background: (1) Tseng Kuang-Hua: Independent Director of the Company (2) Chien Chia-Ying: Independent Director of the Company (3) Chin Jui-Ting: Independent Director of the Company (4) Huang Chen-Yuan: Independent Director of the Company (5) Cheng Yu-Feng: Vice President and Spokesperson of the Company 5. New Members: (1) Tseng Kuang-Hua (2) Chien Chia-Ying (3) Chin Jui-Ting (4) Huang Chen-Yuan (5) Cheng Yu-Feng 6. New Members' Background: (1) Tseng Kuang-Hua: Professor, Department of Business Administration and Institute of Marketing and Digital Analytics, National Chung Cheng University (2) Chien Chia-Ying: Partner Lawyer, Sung Cheng Law Firm (3) Chin Jui-Ting: (Not specified) (4) Huang Chen-Yuan: Chief Financial Officer, China Times Culture Publishing Co., Ltd. (5) Cheng Yu-Feng: Vice President and Spokesperson, Rainbow Development Technology Corp. 7. Nature of Change: Term Expiration 8. Reason for Change: Reappointment following board election 9. Previous Term: 2023/06/21 ~ 2026/06/20 10. Effective Date of New Appointment: 2026/06/22 11. Other Matters: (1) The Sustainability Committee members have elected Mr. Cheng Yu-Feng as the convener and chairperson of the committee. (2) The term of office for the newly appointed members shall commence from the date of re-election and last for three years, i.e., from 2026/06/22 to 2029/06/21.