The nature of business is providing contractual work from bidding project. The Company has a policy to provide contractual work service for high rise building and foundation work

This company is a joint venture between Chaiyanant Trading (2524) Co., Ltd having joint venture ratio of 40 percent and Prayoonchai (1984) Co., Ltd having joint venture ratio of 30 percent. The company was established on May 29, 2007 to perform Srinakarindhra Tunnel and Sukhumvit 103 (Udomsuk) road construction work. Currently, the company does not perform any business activities. In addition, the Company has no policy to use this JV in any bidding project in the future

The company was established on June 20, 2007 to road and pipeline construction for Mitrijit and Kongkao road project. Currently, the company does not perform any business activities. In addition, the Company has no policy to use this JV in any bidding project in the future

The company has a policy to contractual work for bored pile and Diaphragm Wall construction aboard

The company has a policy to contractual work for bored pile and Diaphragm Wall construction in Myanmar