Christian B. Maier

Constantia Industries AG operates as an industrial holding company. It focuses on investment management in the areas of construction, furniture, sports goods, machine and generator assembly, aviation, as well as energy management. The company was founded in 1949 and is headquartered in Vienna, Austria.

ISOVOLTAIC AG manufactures electrical insulation materials, technical laminates and composite materials. It offers ICOSOLAR® backsheets which provides long-term protection for solar cells against mechanical and chemical influences and the effects of the weather, and ensure that sunlight can be efficiently converted into usable energy. The company was founded in 1949 and is headquartered in Lebring, Austria.

Unternehmens Invest AG is a holding company, which engages engages in the acquisition and administration of industrial companies. The company also invests in national and international medium-sized enterprises with long-term investment strategy. It operates through the following segments: UIAG, Pongratz Group, UIAG Holding Group, and Begalom Group. The company was founded in 1990 and is headquartered in Innere Stadt, Austria.

Porr AG provides building construction and civil engineering services. It specializes in foundation engineering, transport infrastructure construction, tunnel construction, power station construction, railway construction, logistics, bridge construction, environmental technology, post-tensioned structures, and pipe network construction. The company was founded in 2011 and is headquartered in Vienna, Austria.

Founded in 1914, TEERAG-ASDAG GmbH is a civil engineering and Austrian construction services company. Part of PORR AG, the company is based in Vienna, Austria.