Formosa Sumco Technology Corporation announced of change in the Company's financial officer. Type of personnel changed (please enter: spokesperson, acting spokesperson, important personnel (CEO, COO, CMO, CSO, etc.),financial officer, accounting officer, corporate governance officer, research and development officer, chief internal auditor, or designated and non-designated representatives):financial officer. Date of occurrence of the change:2021/08/02. Name, title, and resume of the previous position holder: Mitsuru Ichikawa,Senior Administrator of Department of Accounting of FST. Name, title, and resume of the new position holder: Ping-Yueh Yu,Director of Department of Accounting of FST. Type of the change:Resignation. Reason for the change:The resignation of the previous position holder. Effective date:2021/08/02.