Agreement which is a Connected Transaction, Appointment of the Independent Financial Advisor and Calling the Extraordinary General Meeting of Shareholders No. 2/2019 To The President The Stock Exchange of

(Additional) To President The Stock Exchange of Thailand Enclosure 1. Information Memorandum on the Asset Acquisition (Addendum 1) regarding acquisition of shares of S-TREK (Thailand) Co., Ltd. in the

and Allocation of Securities to the Specific Investor (Private Placement) To The President The Stock Exchange of Thailand Attachment 1. Information Memorandum regarding the Acquisition of Assets and

., and Schedule for the EGM of Shareholders No. 1/2019 To: The President The Stock Exchange of Thailand Enclosure: 1. Information Memorandum of Hydrotek Public Company Limited on Disposal of Assets and

., and Schedule for the EGM of Shareholders No. 1/2019 (Revised) To: The President The Stock Exchange of Thailand Enclosure: 1. Information Memorandum of Hydrotek Public Company Limited on Disposal of

., and Schedule for the EGM of Shareholders No. 1/2019 (Revised2) To: The President The Stock Exchange of Thailand Enclosure: 1. Information Memorandum of Hydrotek Public Company Limited on Disposal of

., and Schedule for the EGM of Shareholders No. 1/2019 (Revised3) To: The President The Stock Exchange of Thailand Enclosure: 1. Information Memorandum of Hydrotek Public Company Limited on Disposal of

Assets and Connected Transaction for the Entire Business Transfer and Allocation of Securities to the Specific Investor (Private Placement) To The President The Stock Exchange of Thailand Attachment 1

companies under the market capital of THB 30,000 - 100,000 million from SET Awards 2019, organised by the Stock Exchange of Thailand and Money and Banking Magazine. Furthermore, the company remains listed to

1 --Translation-- Sor Gor 7/2018 January 19, 2018 Subject: Management Discussion and Analysis for the year ended December 31, 2017 (Unaudited) To: The President The Stock Exchange of Thailand