Re: Guidelines for the Book Building and the Determination of Offering Price to Public and Individual

Period As Of Details DIAMOND BUILDING PRODUCTS PUBLIC COMPANY LIMITED 2023 Reviewed Company Q2 30/06/2023 DIAMOND BUILDING PRODUCTS PUBLIC COMPANY LIMITED 2023 Reviewed Consolidated Q2 30/06/2023 DIAMOND

Ref Ref. No. Thor Bor. 004/2561 March 16, 2018 Subject 1. Consider entering into transactions with related parties 2. Sale of land with building to Saha Phatanapibul Public Company Limited (Addition

Year Receive Date Details DIAMOND BUILDING PRODUCTS PUBLIC COMPANY LIMITED 2022 30/03/2023 DIAMOND BUILDING PRODUCTS PUBLIC COMPANY LIMITED 2021 22/03/2022 DIAMOND BUILDING PRODUCTS PUBLIC COMPANY

of UBIS (Asia) Public Company Limited (“the Company”) held on July 16, 2019, it was resolved that the Company enter into a connected transaction of the contact of land lease with factory building and

more manufacturing and delivery of products in year 2018, increases were 47%. Immovable property business saw its income increase Baht 5 million, because rental building leasable area increase from last

manufacturing and delivery of products in year 2018, increases were 47%. Immovable property business saw its income increase Baht 5 million, because rental building leasable area increase from last year. Farm

with factory building and the Machinery purchase agreement (Additional) Attention President of the Stock Exchange of Thailand According to the Board of Directors Meeting No.10/2020 of UBIS (Asia) Public

Cost on Setting up Manufacturing Plant, Warehouse and Office Building 209.46 14.38 3. Machine and Equipment 960.51 65.95 4. Transportation (Truck, Crane, Combilift, Forklift) 43.70 3.00 5. Financing Cost

million) Initial Cost (percent) 1. Land and land improvement 105.91 7.27 2. Construction Cost on Setting up Manufacturing Plant, Warehouse and Office Building 209.46 14.38 3. Machine and Equipment 960.51