The Agbar Group, with over 150 years of history, has a staff of 16,239 and comprises more than 128 companies that operate in the complete water-cycle sector, serving more than 26 million inhabitants throughout the world (Spain, Chile, Mexico, Cuba, Colombia, Peru, etc.).

He joined Agbar in 1995 and was subsequently appointed company delegate in Portugal, a country which, like Spain, signed the Treaty of Accession to the European Economic Community (EEC) on 12 June 1985, which came into force in 1986.

[10] He designed and led Agbar's entry into Chile in 1999 through the acquisition of Empresa Metropolitana de Obras Sanitarias (EMOS), the country's leading company and its second to be put out to tender for public-private participation, after ESVAL.

[15] Simón remained at the Chilean company's helm for three years, during which time it was renamed Aguas Andinas following an internal process to attain greater proximity to the public.

In 2000, Agbar teamed up with Aguas de La Habana as a technological partner, becoming the first mixed company with foreign capital to manage a public service in the country.

In 2006, Simón played a leading role in Agbar's first major European operation in the United Kingdom, with the purchase of Bristol Water through a friendly takeover bid.

[25] In 2021, the French group Veolia, a world leader in resource management (water, energy and waste) and in ecological transformation, made a public offer for the acquisition of Suez shares.

[26][27] Following the validation by the European Commission,[28] in January 2022, the Autorité des Marchés Financiers (AMF) published the results of Veolia's takeover bid for 95.95% of Suez's capital.

The public-private company, which serves almost thirty municipalities and more than three and a half million inhabitants, was created in 2012, and its creation would later be corroborated by a ruling of the High Court of Justice of Catalonia in 2019.

[37] He was also selected by the Cercle d'Economia to chair the European Green Deal commission[38] to promote networking, knowledge transfer, equal opportunities and the circular economy.

The Solidarity Fund, managed through the Agbar Foundation, aims to be an example of a new model of company-society relations and involvement and of commitment to the territory to help integrate all members of the community and improve people's quality of life.

[39] The company is committed to promoting Barcelona as a major global hub for knowledge and innovation in water management, which is a fundamental resource in the face of climate change.