Oliver Mäske

DSI Holding GmbH develops and distributes post-tensioning and geotechnical systems for the construction and underground engineering industries. The company was founded on July 8, 2005 and is headquartered in Munich, Germany.

DSI International Luxembourg SARL engages in the provision of construction and mining services. The company is headquartered in Luxembourg.

Rettig Group Oy AB manufactures hydronic and electrical heating products. It involves in the research and development, design, procurement and production, logistics, and sale and marketing of radiators, towel warmers, underfloor heating products, convectors, valves and controls. The company was founded in 1770 and is headquartered in Helsinki, Finland.

DYWIDAG-Systems International Pty Ltd. manufactures and supplies strata reinforcement products. It provides customers with engineered and systems for post-tensioning, geotechnical applications, global services and concrete accessories. The company was founded in 2002 and is headquartered in Bennetts Green, Australia.

DSI Construction Holdings UK Ltd. is an investment holding private company founded in 2016. The company is based in Southam, UK. The British company's main function is to hold investments.