Gerhard Hugo Hirth

Schwenk Geschäftsführungs GmbH operates businesses in construction chemicals mainly concrete chemicals. The company is headquartered in Ulm, Germany.

SCHWENK Zement KG engages in the production, sale, and distribution of construction and building materials. Its products include cement, special building materials, and concrete. The company was founded by Eduard Schwenk in 1847 and is headquartered in Ulm, Germany.

Köster Holding AG engages in the holding, management, acquisition, and sale of companies involved in civil engineering, building, water, road, and construction works. The company was founded on November 13, 2009 and is headquartered in Osnabrück, Germany.

Wieland-Werke AG engages in the production of non-ferrous semi-finished products. Its product portfolio includes strip and sheets, rods and sectional rods, wire and sectional wires, tubes and finned tubes, heat exchangers, slide bearings, and components. The firm also offers solutions for heat transfer, fish farming, e-mobility, and engineering properties optimization. The company was founded in 1820 and is headquartered in Ulm, Germany.

Ohorongo Cement Pty Ltd. operates a cement factory. The company is headquartered in Windhoek, Namibia.

SCHWENK Donau GmbH & Co. KG provides investment services. The company is based in Ulm, Germany. The CEOs are Markus Scheed, Stefan Fink, Stephan Pott. The German company was founded in 2005.