Atos has relaunched its artificial intelligence (AI), high-performance computing (HPC), and quantum group as Bull, ahead of the subsidiary being carved out as a private, independent company.

It follows the signing of the share purchase agreement with the French State on July 31, 2025, with the transaction expected to close in the first half of 2026.

Bull currently employs around 2,500 employees and has a presence across Europe, Latin America, and India. Its BullSequana HPC systems form the basis for a number forms the basis for a number of the world’s most powerful supercomputers, with its X series architecture supporting exascale-class systems, including Europe’s first exascale system, the Jupiter Booster.

“With the launch of Bull, we are reconnecting with our technological heritage to build our future,” said Emmanuel Le Roux, SVP, Bull. “Our mission is clear: deliver powerful, sustainable, and sovereign computing and AI technologies that enable nations and industries to innovate with confidence and purpose.”

Atos is a French IT vendor and provides on-premises and cloud infrastructure, as well as a host of other IT services. The company has been struggling to bring its debts under control for years and, in October 2024, appointed its seventh CEO in three years.

The company completed a financial restructuring in 2024 and agreed a deal with the French government in July last year for the acquisition of its AI, HPC, and quantum group for €410 million ($490m).