The Stock Exchange of Thailand (SET) announced the 79 companies on the Thailand Sustainability Investment (THSI)
for 2017 on October 31, 2018. TTCL is a one company selected to pass the SET Assessment criteria consisting of 73 listed companies on SET and 6 listed companies on Market for Alternative Investment (MAI).

THSI is a list of listed companies with outstanding performance on Environmental, Social and Governance (ESG) aspects,
which have been used as a quality investment information and decision-making tool for investors.