คำอธิบายและการวิเคราะห์ของฝ่ายจัดการ 9 November 2018 Re: To clarify the financial statements as of 30 September 2018 To: President The Stock Exchange of Thailand WHA Corporation Public Company

Thailand Diamond Building Products Public Company Limited and its Subsidiary (together referred to as “Corporate Group”) would like to clarify on the operating results according to the consolidated financial

คำอธิบายและการวิเคราะห์ของฝ่ายจัดการ 11 August 2020 Re: To clarify the financial statements as of 30 June 2020 To: President The Stock Exchange of Thailand WHA Corporation Public Company Limited (the

Company Limited and its Subsidiary (together referred to as “Corporate Group”) would like to clarify on the operating results according to the consolidated financial statements for the 1st quarter ending

components similar to original COSO framework and elucidated into 17 principles to clarify the concept. Applications The companies are recommended to use this evaluation form as a guidance for evaluating and

offer for sale, the SEC Office may not have granted an approval for such offer for sale. The SEC Office shall have the authority to: (1) order the approved entity or its directors or executives to clarify

sale. The SEC Office shall have the authority to: (1) order the Thai government agencies or their directors or executives to clarify or disclose additional information within a specified period and

offer for sale, the SEC Office shall have the authority to: (1) order the approved foreign entity, its directors or executives to clarify or disclose additional information within a specified period and

referred to as “Corporate Group”) would like to clarify on the operating results according to the consolidated financial statements for the 3-month period and 6-month period ending June 30, 2017 as follows

Diamond Building Products Public Company Limited and its Subsidiary (together referred to as “Corporate Group”) would like to clarify on the operating results according to the consolidated financial