Founded in 1883 in Muggiano, it was combined with the Cantiere navale di Ancona into the Officine e Cantieri Liguri-Anconetani in 1899 and then, together with the Cantiere navale di Palermo, amalgamated into Cantieri Navali Riuniti (CNR) on 31 January 1906.
Ansaldo & C. bought out FIAT in 1918 and the company was renamed Ansaldo-San Giorgio.
Once Odero gained control of the Vickers-Terni armament works in 1927, he amalgamated the shipyard with his other facilities into Odero-Terni.
He acquired the Cantiere navale fratelli Orlando in 1929 and renamed the company, Società per la Costruzione di Navi, Macchine ed Artiglierie Odero-Terni-Orlando (OTO) (later OTO Melara).
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