June 5, 2008 Subject: Notification of the exercise of over-allotment option and return of shares to ExxonMobil International Holdings Inc. To: President The Stock Exchange of Thailand With reference to the Initial Public Offering of shares by Esso (Thailand) Public Company Limited (ESSO), 84,583,300 shares were borrowed from ExxonMobil International Holdings Inc. (EMIHI) as part of an over-allotment option and included in the allocation to retail and institutional investors in Thailand and abroad. Phatra Securities Public Company Limited (Phatra), the Over-allotment Agent, undertook to procure the return of shares to EMIHI within 30 days from the first trading day of ESSO shares on the Stock Exchange of Thailand (SET). The stabilization period of 30 days ended on June 4, 2008. ESSO has been notified that during the period from May 6, 2008 to June 4, 2008, Phatra has purchased a total of 7,058,600 shares from SET at the average price of Baht 9.995 per share as part of stabilization and has exercised the right to purchase newly issued shares from ESSO in the amount of 77,524,700 shares at the IPO price (Baht 10 per share). As a result of such stabilization and option exercise, a total of 84,583,300 shares will be returned to EMIHI. As a result, the shareholding in ESSO by the ExxonMobil Group and the Ministry of finance will be as follow: Number of % of total shares shares ExxonMobil Affiliates 2,283,750,000 65.99% Ministry of Finance 253,750,000 7.33% Consistent with the exercise of the over-allotment option, ESSO will register the increase of paid up capital with the Ministry of Commerce on June 6, 2008. Please be informed accordingly. Yours sincerely, (Mr. Jim M. Anthony)