Meridiam has offices in ten countries (France, Luxembourg, United States, Turkey, Senegal, Austria, Ethiopia, Jordan, Gabon, South Africa[2] ), manages $18 billion of assets and has to date invested in over a hundred transport, building and public services projects.

Set up to finance public infrastructure and to create a secure investment framework for long-term savings, Meridiam received the financial and operational support from the Crédit Agricole Group and AECOM Technology.

[3] In 2006, while achieving the first closing of its fund Meridiam I, the company secured its first two projects: the Limerick Tunnel in Ireland,[4] which began operating in July 2010, and the A5 highway in Austria, which opened to traffic in January 2010.

[5] In 2007, Meridiam acquired the Fulcrum LIFT project covering local healthcare facilities in the United Kingdom,[6] as part of large-scale program sponsored by the British Health Ministry.

[12] In the same year, Meridiam also secured two projects in the United States: the port of Miami Tunnel, inaugurated in May 2014[13] and the North Tarrant Express Highway in Texas, which began operating in October 2014.

In order to finance the student housing facilities of the University of Hertfordshire (scheduled to open in September 2016),[26] the company launched in 2013 the first project bond without credit enhancement in Europe.

[33] Finally, in the context of the 2015 Paris Climate Conference organized in late 2015, Meridiam announced the launch of a new fund dedicated to infrastructure projects relating to energy transition.

The promise to purchase is subject to the waiver of certain precedent conditions, in particular to the approval of SUEZ shareholders and to obtaining the required regulatory authorizations.

[37] Beginning of September 2021, Meridiam takes a 40% stake in Setrag, the concessionaire which operates "the Transgabonais"(Gabon's main railway line), alongside Comilog (a subsidiary of Eramet and the Gabonese State).

At the end of September 2021, Meridiam, alongside its partners, Hydrogen de France (HDF) and SARA (limited company of the Antilles refinery, Rubis Group), launches the project for the West Guyana Power Plant (CEOG).

Signatory of the United Nations’ Principles for Responsible Investment (PRI) since 2010,[57] the company adopted since its inception an Ethics Charter focusing on environmental, social and governance issues.