Astaldi

The company was founded in 1929 by Sante Astaldi, and a member of the Astaldi family remains on the company's board. Astaldi was involved in many major European civil works projects pre-World War II, including the Rome, Naples railway. After the war, the company extended its activities to Africa, where it focused on road construction. Between the 1950s and the 1970s, Astaldi's presence was introduced to the Middle East, Central and South America, and the Far East. The company split into Impresa Astaldi Estero S.p.A. (for foreign markets) and Impresa Astaldi Estero S.p.A. (for Italian projects) in 1950 but merged to form the present-day Astaldi S.p.A. in the 1980s. Astaldi continued to diversify its projects, entering new markets in the United States, Turkey and Indonesia throughout the 1980s and 1990s.

The Canadian portion of the company attempted to build a power station at Muskrat Falls in Labrador, Canada in 2016 without having a structural engineering permit to work on such a project. The company was deemed "professionally incompetent". In November 2020, Webuild acquired a 65% shareholding in Astaldi.

Significant projects include:

Italy

• Rome Metro completed in 1955
• Genoa Metro completed in 1990
• The Lampeggiano Dam in Italy completed in 1992
• Milan Metro completed in 1999
• The Rosamarina Dam in Sicily completed in 1999
• The Rome-Naples High Speed Line completed in 2005

Romania

• Arena Națională completed in 2011
• Basarab Overpass completed in 2011

Turkey

• Mount Bolu Tunnel, 2,954 m (9,692 ft) long road tunnel completed in 2007
• Golden Horn Metro Bridge, 936 m (3,071 ft) long metro line bridge, completed in February 2014.
• Yavuz Sultan Selim Bridge, a road-rail bridge over the Bosphorus with a longest span of 1,408 m (4,619 ft), completed in August 2016.
• Osman Gazi Bridge, road bridge with 1,550 m (5,090 ft) longest span, completed in 2016

Abroad

• Caracas Metro in Venezuela completed in 1983
• Large Electron-Positron Collider for CERN, Switzerland completed in 1989
• Copenhagen Metro completed in 2002
• Upgrade for a key stretch of Bulgarian railway infrastructure completed in 2010
• Second line of Warsaw Metro completed in 2013
• Construction of the new International Terminal of Santiago International Airport, Santiago, Chile, completed in 2021.
• Expressway S2 in Warsaw, Poland completed in 2021.
• Construction on the Versova-Bandra Sea Link in Mumbai, India due to be completed in 2023.
• Construction of the dome structure of the European Extremely Large Telescope on Cerro Armazones for the European Southern Observatory in Chile due to be completed in 2024.