DCORP 024/2018 March 2, 2018 Subject: Report on the overall operation for year 2017 ended December 31, 2017 and the decrease in the overall operation more than 20 percent. (Revised) Attention: President

1 --Translation-- Sor Gor 106/2017 October 20, 2017 Subject: Management Discussion and Analysis for the third quarter ended September 30, 2017 (Unreviewed) To: The President The Stock Exchange of

1 --Translation-- Sor Gor 113/2017 November 9, 2017 Subject: Management Discussion and Analysis for the third quarter ended September 30, 2017 (Reviewed) To: The President The Stock Exchange of

DCORP 048/2018 May 15, 2018 Subject: Report on the overall operation for first quarter of the year 2018 ended March 31, 2018 and the decrease in the overall operation more than 20 percent Attention

DCORP 070/2018 August 14, 2018 Subject: Report on the overall operation for first half of the year 2018 ended June 30, 2018 and the decrease in the overall operation more than 20 percent Attention

DCORP 084/2018 November 14, 2018 Subject: Report on the overall operation for first 9 months of the year 2018 ended September 30, 2018 and the decrease in the overall operation more than 20 percent

Transactions Deemed as Acquisition or Disposal of Assets, and the Notification of the Board of Governors of the Stock Exchange of Thailand Re: Disclosure of Information and Other Acts of Listed Companies

, mainly due to the following reasons: 1. Revenue from sales of goods and rendering of services totaled at THB 46,481 million, a decrease of 4% QoQ, mainly from petroleum related businesses. For the Company

(Additional) To President The Stock Exchange of Thailand Enclosure 1. Information Memorandum on the Asset Acquisition (Addendum 1) regarding acquisition of shares of S-TREK (Thailand) Co., Ltd. in the

Determination of the Date of Extraordinary General Meeting of Shareholders No. 1/2018 To: President The Stock Exchange of Thailand Enclosures: 1. Information Memorandum on the Offering of Newly Issued Ordinary