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

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

Attn : The Directors and The MAI Manager Ref: Dimet AC 0818/1 August 27, 2018 Attention: The Directors and The MAI Manager The Stock Exchange of Thailand Subject: Year End result and clarification of

Attn : The Directors and The MAI Manager Ref: Dimet AC 1811/001 November 13, 2018 Attention: The Directors and The MAI Manager The Stock Exchange of Thailand Subject: Report on Q.1’s performance

Attn : The Directors and The MAI Manager Ref: DIMET AC 1911/001 November 14, 2019 Attention: The Directors and The MAI Manager The Stock Exchange of Thailand Subject: Report on Q.1’s performance

ที่บชง Page 1 of 4 Ref. Bor Chor Ngor 0154 /2018 10 May 2018 Subject: Management Discussion and Analysis for the First Quarter ended 31 March 2018 To President The Stock Exchange of Thailand Quality

ที่บชง Page 1 of 4 Ref. Bor Chor Ngor 0048/2020 26 February 2020 Subject: Management Discussion and Analysis of Operating Results for Fiscal Year 2019 To President The Stock Exchange of Thailand

ที่บชง Page 1 of 4 Ref. Bor Chor Ngor 0280/2019 13 August 2019 Subject: Management Discussion and Analysis for the Second Quarter ended 30 June 2019 To President The Stock Exchange of Thailand

ที่บชง Page 1 of 4 Ref. Bor Chor Ngor 0140 /2020 13 May 2020 Subject: Management Discussion and Analysis for the First Quarter ended 31 March 2020 To President The Stock Exchange of Thailand Quality

Ref: CEO 019/2018 9 November 2018 Subject: Clarification on First Quarter’s Operating Performance (3/2018) To : The Secretary of the Securities and Exchange Commission The company clarifies causes