Stak Inc. researches, develops, manufactures, and sells specialized oilfield production and maintenance equipment. Its offerings include oilfield vehicles such as oil pumping trucks, oil-well repair trucks, fracking trucks, well flushing-wax removal trucks, and boiler trucks, as well as equipment such as well repair components, fracking equipment, well cleaning and wax removal equipment, oil pumping units, and boilers. The company also provides automation solutions services, including software development, training, and debugging for this equipment. Founded in 2012, Stak Inc. is based in Changzhou, China, and is a subsidiary of Lanying Capital Ltd.