No. Esso/SET/006/53 June 3, 2010 Subject: Cessation of Executive of Esso (Thailand) Public Company Limited To: President The Stock Exchange of Thailand Esso (Thailand) Public Company Limited ("Company") would like to notify the Stock Exchange of Thailand that Mrs. Phantipa Rasananda has retired from the Company and has ceased to be the Investor Relations Manager of Company. Mr. Chan Ittithavorn has been appointed as the Investor Relations Manager to replace Khun Phantipa Rasananda with effect from June 1, 2010 Please be informed accordingly Your truly Esso (Thailand) Public Company Limited (Mr. Rene Gonzalez) Company Secretary