- Prachuab Ujjin - (Mr. Prachuab Ujjin) Director and Chief Executive Officer

Securities and Exchange Commission and the SET. Please be informed accordingly. Your sincerely, Demeter Corporation Public Company Limited - Sureeporn Udompolvanich - (Ms. Sureeporn Udompolvanich) Director and

sincerely, Demeter Corporation Public Company Limited - Sureeporn Udompolvanich - (Ms. Sureeporn Udompolvanich) Director and Chief Executive Officer

Udompolvanich - (Ms. Sureeporn Udompolvanich) Director and Chief Executive Officer

/ Member of the Risk Management Committee / Member of the Nomination and Remuneration Committee / Chief Executive Officer 2. Mr.Danai Amornpatchara Director / Member of the Risk Management Committee / Member

Investor (Private Placement) 5. Profile and Working Experience of a Nominated Director Following Hydrotek Public Company Limited (the “Company”)’s Board of Directors’ Meeting No.6/2018 held on April 3, 2018

appropriate under the applicable laws. Please be notified accordingly. Yours faithfully, (—-Signature—-) Mr. Slib Soongswang Chief Executive Officer Signatory Director

Investor (Private Placement) 5. Profile and Working Experience of a Nominated Director Following Hydrotek Public Company Limited (the “Company”)’s Board of Directors’ Meeting No.6/2018 held on April 3, 2018

attached hereto as Enclosure 3. Sincerely yours, (Mr. Peerapong Jaroon-ek) Director and Chief Executive Officer Authorized Signatory (Translation) OOrriiggiinn PPrrooppeerrttyy PPuubblliicc CCoommppaannyy

, (Mr. Peerapong Jaroon-ek) Director and Chief Executive Officer Authorized Signatory (Translation) OOrriiggiinn PPrrooppeerrttyy PPuubblliicc CCoommppaannyy LLiimmiitteedd 496, Moo 9, Samrong Nuea