November 12, 2019 Subject: Notification of the Resolution of the Board of Directors Meeting Re: the Investment in N.E.X.T Company Limited (additional) To: President Stock Exchange of Thailand Enclosure

Ref. DBP. 068 / 2018 May 14, 2018 Subject : Clarification on operating results for the 1st Quarter ending March 31, 2018 To : President The Stock Exchange of Thailand Diamond Building Products Public

ที่ กตพ Ref. DBP. 108 / 2019 August 13, 2019 Subject : Clarification on Operating Results for the 2nd quarter and 6-month Period ending June 30, 2019 To : President The Stock Exchange of Thailand

Ref. DBP. 153 / 2019 November 11, 2019 Subject : Clarification on Operating Results for the 3rd quarter and 9-month Period ending September 30, 2019 To : President The Stock Exchange of Thailand

Ref. DBP. 111 / 2020 August 10, 2020 Subject : Clarification on Operating Results for the 2nd quarter and 6-month period ending June 30, 2020 To : President The Stock Exchange of Thailand Diamond

for the year ended December 31, 2019 To Director and Manager of the Stock Exchange of Thailand Referring to the submission of the audited financial statements of WIIK Public Company Limited “the Company

แบบแสดงรายการข้อมูลสำหรับการเสนอขายหลักทรัพย์ (แบบ 69-1) 1 No. WHAUP-CS009/2562 May 09, 2019 Attention: Managing Director – Stock Exchange of Thailand Subject: Report of Financial Results for the

Executive, Invitation to Shareholders to propose agenda and nominees’ name for being the Director in advance for the Annual General Shareholder's Meeting in 2019 To The President The Stock Exchange of

Executive, Invitation to Shareholders to propose agenda and nominees’ name for being the Director in advance for the Annual General Shareholder's Meeting in 2019 (ADD) To The President The Stock Exchange of

-1 1 Ref. LPN/SorKor/053/2563 13rd February 2020 RE: Financial Statements Analysis Report 2019 Dear: President The Stock Exchange of Thailand L.P.N. Development Public Co., Ltd. would like to submit