., 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

., Ltd. To: President The Stock Exchange of Thailand Enclosure: Information Memorandum regarding the Acquisition of Asset of Demeter Corporation Public Company Limited The Meeting of the Board of Directors

005/2017 24 November 2017 Subject: Informing on the acquisition of assets of ZIGA Innovation Public Company Limited Attention: The President The Stock Exchange of Thailand Attachment: Disclosure of

the shareholding in subsidiary companies To: President The Stock Exchange of Thailand Attachment: 1. Structure of the shareholding in subsidiary companies 2. Information on the Connected Transaction of

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No. Kor Bor Ror. 026/2018 March 6, 2019 President The Stock Exchange of Thailand Sub : Dividend payments, connected transaction, the shareholders’ meeting date, and the dissemination of the meeting

No. WPH-SET 9/2019 August 9, 2019 Subject : The expansion of Wattanapat Samui Hospital project To : Director and Manager The Stock Exchange of Thailand Enclosure: The Acquisition and Disposition of