STAK Inc. designs and manufactures specialized oilfield vehicles and equipment for the upstream oil and gas industry in China, outsourcing final vehicle assembly while retaining sales responsibility. The company generates revenue from three main streams: sales of complete specialized oilfield vehicles and standalone equipment, comprehensive automation solutions services including software development and training for production and maintenance equipment, and sales of parts and materials such as integrated circuits and components. STAK serves corporate customers in China's upstream oil and gas sector through framework cooperation agreements, operating as an integrated designer and manufacturer that combines proprietary component manufacturing with selective outsourcing, and recognizing revenue upon customer acceptance or pickup with typical payment terms extending six months after control transfer.