Johann Lehner

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.

European Panel Federation manufactures wood-based panels. Its products include Particleboard, MDF OSB, Hardboard, Softboard and Plywood. The company is headquartered in Brussels, Belgium.

Treibacher Industrieholding GmbH engages in the acquisition and management of participating interests in firms. The company was founded on April 2, 2007 and is headquartered in Althofen, 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.

Esola Beteiligungsverwaltungs GmbH engages in the holding and management of participations in companies. The company was founded on April 2, 2007 and is headquartered in Rankweil, Austria.

WIG Wietersdorfer Holding GmbH engages in the manufacture and distribution of building materials. Its product portfolio includes cement, concrete, limestone, and pipes. It operates through the following segments: Cement and Concrete, Lime, Building Materials, HOBAS, POLOPLAST, and Shareholding. The company is headquartered in Klagenfurt, Austria.