Herrenknecht AG is a German manufacturer of 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 4,600 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 different locations across China. The company contains 82 subsidiaries around the world and has worked on 2,600 projects.
Martin Herrenknecht established the Martin Herrenknecht engineering company in 1975. This became Herrenknecht GmbH two years later with capital of 20 million euros. By 1984, Herrenknecht had opened its first subsidiary abroad in Sunderland, England as Herrenknecht International Ltd.
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