The company acquired a majority holding in Cobra, a support services business, and merged with OCISA S.A. to create OCP Construcciones, S.A.

[12][13] In September 2011, ACS Group issued an offer to purchase a controlling stake in German rival Hochtief;[14] the latter mounted an unsuccessful challenge to this approach.

[21] Two years later, under the company's strategy of continuous rotation of mature assets to generate resources for new projects, ACS Group sold a 74% stake in a batch of six tranches of ‘shadow toll’ highways in Spain to Hermes for €950 million.

[25] During 2021, ACS Group conducted an internal review to simplify its structure and allegedly considered spinning out its construction business; around this time, the company was focused on increasing its toll road division within the European market.

[28] In July 2022, the company was fined €57.1 million, along with five other contractors, by the Comisión Nacional de los Mercados y la Competencia (CNMC) for bidding collusion in public tenders for building and civil infrastructure works.

[30][31] That same year, ACS Group reported that it had achieved better than expected results, which was largely attributed to its construction portfolio in the United States and Australia, particularly its toll road interests.