Atos is a French multinational information technology (IT) service and consulting company headquartered in Bezons, France and offices worldwide. It specialises in hi-tech transactional services, unified communications, cloud, big data and cybersecurity services.Atos operates worldwide under the brands Atos, Atos|Syntel, Atos Consulting, Atos Healthcare, Atos Worldgrid, Groupe Bull, Canopy and Unify.
The company was formed in 1997 through a merger of two French IT companies; and combined with the Dutch-based company Origin B.V. in 2000 to become Atos Origin.It subsequently acquired KPMG Consulting in 2002 and SchlumbergerSema in 2004.
In 2010 Atos Origin announced the buyout of Siemens IT Solutions and Services and finalized the acquisition in July 2011. Afterwards, the company name reverted to Atos