Johannes Dotter

Alpine Holding GmbH engages in the provision of services in various areas of the construction industry. The company was founded in September 1965 and is headquartered in Wals bei Salzburg, Austria.

Part of STRABAG SE, STRABAG AG is a construction company based in Vienna, Austria. The Austrian company is known for its expertise and innovative strength, and is the largest construction company in Austria, as well as the market leader in all areas of the construction industry.

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.