To examine the processing and sales of planted teak timber in Thailand, we analyzed the behavior of the Lop Buri Private Forest Plantation Cooperative Limited (PFPC) and Tha Sao Sawmill LTD., Partnership (Tha Sao Sawmill) as excellent examples, and the Nong Bua Lam Phu PFPC as an example targeting efforts to strengthen and stabilize future management. It was clear that the Lop Buri PFPC had received economic support, largely from an influential member of the cooperative and had many customers to match the supplies around Lop Buri city, hence its management was stable. It was also clear that most of the teak　furniture materials consumed in Tha Sao Sawmill’s factory were delivered from the companies’ own planted forests and used specific techniques for the coating process, which gave it a sales advantage over other companies. Conversely, the Nong Bua Lam Phu PFPC, located in northeastern Thailand, lacked such advantages. Accordingly, recapitalization of the latter cooperative was considered inevitable to strengthen and stabilize its management.