Taiwan Styrene Monomer Corporation announced company?s Financial Officer and Corporate Governance Officer changes. Name, title, and resume of the previous position holder: Erin Chan-Manager of Finance and Accounting Division. Name, title, and resume of the new position holder: Chen Ming Nan-Director of Finance and Accounting Division.

Reason for the change: Personal reason. Effective date: August 9, 2023. New Financial Officer and Corporate Governance Officer was announced on June 30, 2023 and endorsed by the resolution from Board of Directors on August 9, 2023.