Governors of the Stock Exchange of Thailand Re: Disclosure of Information and other Acts of Listed Companies concerning the Acquisition and Disposition of Assets B.E.2547 (2004) on 29th October 2004

Bangkok, April 21, 2014 ? The SEC jointly with the National Science and Technology Development Agency (NSTDA), the Stock Exchange of Thailand (SET), the Thai Business Incubators and Science Parks

operating results of the Company in the year 2018 decreased comparing to last year. For your consideration to the members of The Stock Exchange of Thailand and those interested to be informed accordingly

disclose information on the said transaction to the Stock Exchange of Thailand (“SET”) in accordance with the Acquisition or Disposal Notification as follows: 1. Date / Month / Year of the Transaction After

the Agenda of the Extraordinary General Meeting of the Shareholders No. 1/2019. (Amendment 3) To : The Directors and Managing Director. The Stock Exchange of Thailand. The Board of Director‟s Meeting of

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

Disposal of Assets Transaction, and Acquisition of Assets Transaction To : Director and Manager The Stock Exchange of Thailand Enclosure 1. Information Memorandum on the Disposal of Komchadluek Business and

Ref.No.IVL001/08/2019 8th August 2019 President The Stock Exchange of Thailand Subject: Acquisition of Integrated Oxides and Derivatives Businesses/ Assets Enclosure: Information concerning the Acquisition of

capital market products, or capital market products traded on the Stock Exchange of Thailand or derivatives exchange, the intermediary may reduce details in methods and procedures of the communication and

., 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