Atos is a European multinational information technology company, headquartered in France.[i] Atos builds the exascale supercomputers used by the French Alternative Energies and Atomic Energy Commission (CEA), and the UK Atomic Weapons Establishment (AWE) for nuclear simulations.[ii] As both France and the UK have ratified the Comprehensive Test Ban Treaty (CTBT), they have developed alternatives to full scale nuclear explosive testing to further develop their nuclear arsenals.
[i] Who we are (no date) | Atos. Available at: Who we are – Atos (Accessed: 17 February 2026).
[ii] The French CEA selects Atos’ BullSequana XH3000. Atos, 15 November 2022. Available at The French CEA selects Atos’ BullSequana XH3000; ‘UK Atomic Weapons Establishment to install TFinity Tape Library’, DCD, 3 December 2020. Available at: UK Atomic Weapons Establishment to install TFinity Tape Library – DCD.
Last updated: 2026-06-08 15:10:12