Herrenknecht AG is a German construction equipment manufacturer. The company manufactures tunnel boring machines, headquartered in Allmannsweier, Schwanau, Baden-Württemberg. It is the worldwide market leader for heavy tunnel boring machines. Roughly two-thirds of the 5,000 employees work at the company headquarters in the installation of hydraulic and electronic components is carried out as well as final inspection. Approximately 300 work at three locations across China. The company has 82 subsidiaries around the world and has worked on 2,600 projects.