Summary of operations and the factors that make a significant change Summary of Operations for the Year 2019 Topic Annual Balance Change 2019 2018 2019 VS 2018 (MB) (MB) % Total Revenue 7,076.7 4,237.6

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

- 2019 Balance by Quarter Change Q1–19 Q4–18 Q1–18 Q1–19 VS Q4–18 Q1–19 VS Q1–18 (Million Baht: MB) (MB) % (MB) % Total Revenue 1,266.5 1,109.5 1,044.9 157.0 14.2 221.6 21.2 Total Operating Expenses

. Dear sir, We, Unimit Engineering Public Company Limited (UEC) , would like to clarify the change in operating result for Q1/2019 which changing over 20% from the same period last year as follows ; Unimit

. (Revised) Dear sir, We, Unimit Engineering Public Company Limited (UEC) , would like to clarify the change in operating result for Q1/2019 which changing over 20% from the same period last year as follows

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

MTHB according to the change of severance payment policy following the amended Labor Protection Act. * Note Please find further information in the consolidated financial statements. 2 Summary of

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

of last year. Therefore the company would like to clarify that the change was caused mainly by the significan transaction as bellows: 1.1 Sales and service income of the company for year 2018 decreased

(Translation) Re: BOD.SET 014/2018 May 11, 2018 Subject: Clarification on the Change in operating results for the three month period ended March 31, 2018 over 20% compared with the same period of the