of the SEC Office (if any) and/or the conditions for the Stock Exchange of Thailand’s acceptance of securities (if any), including the compliance with such obligations or conditions in the following

required to sumbmit such attachments to the Stock Exchange of Thailand (SET) as well. - 3 - SEC Classification : ใชภ้ายใน (Internal) Part 1 Business Operation and Operating Results 1. Organizational

0 ] Ref. No. IVL 001/05/2021 6 May 2021 The President The Stock Exchange of Thailand Subject: Submission of Quarterly Review of Financial Statements and the Management Discussion and Analysis of

operating results for the 3-month period and 6-month period ending June 30, 2017 To : President The Stock Exchange of Thailand Diamond Building Products Public Company Limited and its Subsidiary (together

Ref. DBP. 141 / 2017 November 13, 2017 Subject : Clarification on Operating Results for the 3-Month Period and 9-Month Period ending September 30, 2017 To : President The Stock Exchange of Thailand

regarding the Acquisition and Disposition of Assets of the Company (Revised) Attention: President, The Stock Exchange of Thailand According to the resolution of the Board of Director’s Meeting No. 8/2019 of

7 flights per week to 14 flights per week (March 2018) New Route  Chiang Mai – Hanoi 7 flights per week (March 2018) 2. The Company has signed the contract for the purchase of 4 additional ATR 72

14 flights per week (March 2018) New Route  Chiang Mai – Hanoi 7 flights per week (March 2018) 2. The Company has signed the contract for the purchase of 4 additional ATR 72-600s at the Singapore

:  Rules and Practices Regarding Currency Exchange and Measures to Prevent Thai Baht Speculation The Bank of Thailand issued Notice of the Competent Officer on Rules and Practices regarding Currency Exchange

.  Foreign Exchange Regulations The Bank of Thailand issued Notice of the Competent Officer on Rules and Practices regarding the Undertaking of Authorized Money Changers (No. 6), and Notice of the Competent