1 11 February 2020 Subject: Explanation of operating result in the financial statement ended 31 December 2019 To: President of the Stock Exchange of Thailand With reference to the financial statement

period of last year The explanation for Company’s Operation change from same period more than 20% To : The President The Stock Exchange of Thailand T.C.J. Asia Public Company Limited (“TCJ”) and its

, The Stock Exchange of Thailand T.C.J. Asia Public Company Limited (“TCJ”) and its subsidiaries herewith submit the clarification of the Company’s operating performance for the 1st quarter of the year

recommendation disclosed via the Stock Exchange of Thailand (SET), the independent financial advisor has reaffirmed its advice against the contract transaction.The SEC therefore recommends that the shareholders

: EIC-AD033/2019 13 August 2019 Subject: Management Discussion and Analysis for the Performance for Six-Month Period ended 30 June 2019 To: President The Stock Exchange of Thailand The Board of Directors

หนังสือแสดงการรับทราบความผิด 13 November 2019 Subject : Management Discussion and Analysis of third quarter ended 30 September 2019 Attn. : Director and Manager The Stock Exchange of Thailand Encls

Ref: ACC6401 / 001 March 01, 2021 Subject Clarification of Operating results for the year 2020, Ending December 31, 2020 Attention: Director and Manager The Stock Exchange of Thailand As Advanced

the Capital Market Supervisory Board No. Tor Thor. 65/2552 Re: Rules, Conditions and Procedures for Over-the-Counter Securities Brokerage Off the Stock Exchange of Thailand dated 3 August 2009; (8) The

No. Kor Bor Ror. 013/2019 October 22, 2019 President The Stock Exchange of Thailand Sub : Connected transaction, determination of the date for the Extraordinary General Meeting of Shareholders, and

1 / 2 IR.023/2018 13 November 2018 Re: Notification of the changes of the Profit and Loss Statement To President The Stock Exchange of Thailand We, T Engineering Corporation Public Company Limited