GTMB offers the entire spectrum of CNC-based milling and turning services with a turnover of around 30 million euros and approx. 160 employees.

With its headquarters in Treuenbrietzen, GTMB operates a modern production site. The company offers the highest technological depth and level of automation with a focus on customized and high-precision products. GTMB has a long-standing, diversified blue-chip customer base in attractive end markets such as power distribution, measurement technology and transmission manufacturing.

The GT Group consists of GTMB Metallteilfertigung GmbH, GTB Bahntechnik GmbH https://www.gtbbahn.de/ and Metallbearbeitung Harz GmbH (MBH) https://www.mb-harz.de, which was acquired by the group in October 2025.

With the addition of MBH, GT Group further strengthens its capabilities in the field of rail vehicle construction and expands its expertise as a trusted partner for the rail industry.