บริษัท สำนักกฎหมายธรรมนิติ จำกัด Information memorandum on Acquisition of Assets of Halcyon Technology PLC. (HTECH) Company’s Name Master Carbide Tools Company d/b/a Mastertech Diamond Products

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Diamond Products Company. Details are shown in the Attachment: Information Memorandum on Acquisition of Assets. Please be informed accordingly. Yours Sincerely, Pete Rimchala Managing Director Information

Ref. DBP. 024 / 2020 February 25, 2020 Subject : Clarification on Operating Results of Year 2019 To : President The Stock Exchange of Thailand Diamond Building Products Public Company Limited and its

ที่ กตพ Ref. DBP. 030 / 2019 February 20, 2019 Subject : Clarification on Operating Results of Year 2018 To : President The Stock Exchange of Thailand Diamond Building Products Public Company Limited

ที่ กตพ Ref. DBP. 073 / 2019 May 13, 2019 Subject : Clarification on Operating Results for the 1st quarter ending March 31, 2019 To : President The Stock Exchange of Thailand Diamond Building

subsidiary, Mastertech Diamond Products Company, in the US, which was consolidated for the first time in this quarter. Revenues from the Importing and Selling of Cutting Tools segment include sales from 5

Thailand Sustainability Investment 4/ Thailand Sustainability Investment n/a Ranking by Industry Business 4/ Business The Company operates a business as a retailer of diamond jewelry. Top 10 Major

สารสนเทศการได้มาซ่ึงสินทรัพย์ บริษัท แฮลเซ่ียน เทคโนโลยี ่จ ากดั (มหาชน) (HTECH) ช่ือบริษทั Master Carbide Tools Company d/b/a Mastertech Diamond Products Company (หรือ ช่ือยอ่ “MDP”) วนัท่ีท ำรำยกำร

Ref. DBP. 066 / 2020 May 11, 2020 Subject : Clarification on Operating Results for the 1st Quarter ending March 31, 2020 To : President The Stock Exchange of Thailand Diamond Building Products Public