Astm

Astm is a company based in Turin, controlled by the Gavio Group, active in managing motorway concessions and building major infrastructure. The group is rooted in Tortona and operates about 6,200 kilometres of motorways worldwide, with projects also completed in Sweden, Denmark and Botswana ^[1].

The Golden Gate Bridge contract

In November 2026 Astm, through its American subsidiary Halmar International, was awarded a contract worth 863.9 million dollars, about 770 million euros, for the seismic retrofit of the Golden Gate Bridge in San Francisco ^[1]. The contract was approved by the Californian authorities in October 2025 and signed the following December; the works entered their operational phase at the start of January 2026, while the first overnight lane closures began on 5 October of that year ^[1].

The work covers the bridge's two towers and side spans, including reinforcing the load-bearing structures, replacing the roadway's isolation joints and installing 28 devices designed to dissipate seismic energy. Repainting the top of the south tower is also planned. Completion of the works is set for September 2031 ^[1].

The Golden Gate Bridge, opened in 1937, is 2.7 kilometres long, with a main span of 1,280 metres, and is crossed every day by about 95,000 vehicles as well as pedestrians and cyclists. The site has been organized so as not to interrupt traffic: work is also carried out beneath the roadway, and in the first phase overnight restrictions are planned between 8 pm and 5 am, while still keeping at least one lane open in each direction ^[1].

Astm's chief executive, Umberto Tosoni, called the operation a source of «great pride», stressing the responsibility tied to work on an infrastructure of international symbolic importance ^[1].

Chronology

• 2 November 2026 — The Gavio Group, through its subsidiary Astm and the American company Halmar International, is awarded a contract worth 863.9 million dollars (about 770 million euros) for the seismic retrofit of the Golden Gate Bridge in San Francisco. → Quotidiano Piemontese

Sources

1. Il Golden Gate Bridge si affida al gruppo Gavio: commessa da 770 milioni per proteggerlo dai terremoti — Quotidiano Piemontese, 2 November 2026