The study explores a corporate sustainability model called sufficiency thinking through a case study of a small medium-sized enterprise in Thailand. A multi data collection approach is adopted to collect data at Nithi Foods. Our researchers collected case study data that is supplemented by non-participant observations made during visits, and reference to documentation and information supplied by, or published about, the company (e.g. news reports, magazine articles). Formal and informal discussions were also held with top management team members and employees. Other stakeholders were also interviewed. All were chosen on a convenience basis. Overall, findings support the sufficiency thinking model as an approach to corporate sustainability for SMEs. Business practices informed by virtues, knowledge, sufficiency mindset, action principles are identified and discussed. Measurable outputs and outcomes are also identified as discussed. Relevant theoretical processes are asserted where appropriate. Practical implications are also discussed.