% of Revenue from sale and service, increased from last year that gross profit margin was 3.56%. This is result from effective inventory management even though the steel price trend decreased same as

ชี้แจงผลการดำเนินงานของบริษัทและบริษัทย่อยประจำปี 2549 UKEM012/2020 May 15, 2020 Subject : Management Discussion and Analysis of Business Operation results for Quarter 1/2020 To : Director and

because the gross profit of feeds was higher than the previous year which increased by 30 million baht, due to mainly from the efficiency improvement of production cost management. Sincerely Yours, ( Mr

IDH-AC-000-อส6302/30.00 20 February 2020 Re: Management Discussion and Analysis Operating results for the year ended 31 December 2019 To: President The Stock Exchange of Thailand Overview of the

24th February 2019 Subject: Management Discussion and Analysis for the Year Ending 31st December 2019 Attention: President Stock Exchange of Thailand Please find below the additional information

13 May 2019 Subject: Management Discussion and Analysis for the Quarter 1 Ending 31 March 2019 Attention: President Stock Exchange of Thailand Please find below the additional information supporting

12th May 2020 Subject: Management Discussion and Analysis for the three-month period ending 31st March 2020. Attention: President Stock Exchange of Thailand Please find below the additional

. Engineering service (“EN”) had an increase in gross profit for Baht 20 million because of no revision of estimated project cost of construction and electrical engineering. 2. Management Service (“MS”) had a

. Engineering service (“EN”) had a decrease in gross profit for Baht (17.71) million because of decrease in revenue and revision of estimated project cost of construction and electrical engineering. 2. Management

หนังสือแสดงการรับทราบความผิด 14 August 2019 Subject : Management Discussion and Analysis of the second quarter 2019 ended 30 June 2019 Attn. : Director and Manager The Stock Exchange of Thailand