Harald Ziebula

Zumtobel Lighting GmbH produces ballasts for fluorescent light fittings. Its brands include Zumtobel, Thorn, and TridonicAtco. The company was founded in November, 2005 and is headquartered in Dornbirn, Austria.

Founded in 2017, Umdasch Real Estates (UK) Ltd. is a subsidiary of Umdasch Group AG that leases and operates real estate properties. The company is based in Sittingbourne, UK.

Umdasch Group AG develops, manufactures and distributes formwork technology for use in construction sector. It provides moulds needed for getting the liquid construction materials. The firm's products and services include formwork for walls and floor-slabs in residential construction projects, as well as climbing formwork for office high-rises, automatic climbing formwork for giant cable-stayed bridges, and complicated tunnel formwork. It also specializes in professional store branding, shop marketing, and conceptualization and implementation of retail-outlet investments. The company was founded by Stefan Hopferwieser in 1868 and is headquartered in Amstetten, Austria.

Pro Solar Energietechnik GmbH develops, produces and sells solar heat systems for domestic water & space heating. The company was founded in 1993 and is headquartered in Ravensburg, Germany.

Part of Umdasch Group AG, Doka Denmark ApS is a Danish company that specializes in providing professional advice and support to contractors. The company is based in Koge, Denmark. The company has a strong network of over 160 distribution and logistics locations in more than 70 countries, ensuring the timely and professional delivery of materials and technical support, regardless of the size and complexity of the construction project. The company offers solutions with architectural concrete that are precisely tailored to each situation and the requirements of the building. Doka offers formwork solutions in all areas of construction, whether it is residential construction, construction of traffic routes, energy supply systems, or the construction of the world's tallest building. The CEO of the company is Robert Hauser.

Doka Sverige AB sells and rents molding equipment. The private company is based in Uddevalla, Sweden. The Swedish company was founded in 1956. The CEO is Robert Hauser.