Porr AG is a construction group listed on the Vienna Stock Exchange with its headquarters in Vienna. It is one of the largest Austrian construction companies and is active nationally and internationally in all sectors of the construction industry: from civil engineering including traffic route construction, tunnelling and special civil engineering, to building construction, environmental engineering and facility management. Today's parent company, PORR AG, was founded in 1869 under the name Allgemeine Österreichische Baugesellschaft as a public limited company, making PORR the oldest listed company in Austria. The name PORR goes back to the construction engineer Arthur PORR, co-founder of A. PORR Betonbauunternehmung Ges.m.b.H., which merged with the company in 1927. Wikipedia