27 February 2019 Subject :Management discussion and analysis of financial statement for the year 2018, ended December 31, 2018 Attention :Director and Manager The Stock Exchange of Thailand The

Attn : The Directors and The MAI Manager Ref: Dimet AC 1905/001 May 13, 2019 Attention: The Directors and The MAI Manager The Stock Exchange of Thailand Subject: Report on Q.3’s performance (January

วันที่ 11 กุมภาพันธ์ 2551 Ref: Dimet AC 1805/001 May 14, 2018 Attention: The Directors and The MAI Manager The Stock Exchange of Thailand Subject: Report on Q3’s performance Dear Sir, We would like

May 12, 2018 Subject: Clarification of Operating Results for The three -month period ended March 31, 2018 Attention: President The Stock Exchange of Thailand Further to our submission of the report

14 November 2018 Subject :Management discussion and analysis of financial statement for three-month period ended 30 September 2018 Attention :Director and Manager The Stock Exchange of Thailand The

Attn : The Directors and The MAI Manager Ref: Dimet AC 2006/001 June 16, 2020 Attention: The Directors and The MAI Manager The Stock Exchange of Thailand Subject: Report on Q.3’s performance (January

three -month period ended June 30, 2020 Attention: President The Stock Exchange of Thailand Further to our submission of the report and the financial statements for the six-month period ended June 30

Unofficial translation FORM 35-E2 Letter of Consent (Inspection of the director and executive’s qualification on the company’s request) Attention: Secretary General, the SEC Office Whereas I

Ref. 0347/2018 Date August 14, 2018 Subject 20% Performance Growth in the second quarter of 2018 Attention: Directors and Managers The Stocks Exchange of Thailand QTC Energy Public Company Limited

required to verify this. Our evidence cautions regulators to pay attention to whether a limited number of approved audit firms leads to market concentration, which might result in clients unnecessary paying