Bull and Schwarz Digits sign MoU for a European AI cloud stack

A Franco-German MoU, announced in Berlin

Bull and Schwarz Digits announced the memorandum of understanding on Tuesday at the German government's 2026 Digital Summit in Berlin. Schwarz Digits is the IT and digital division of Schwarz Group, the parent of the Lidl and Kaufland supermarket chains.

Under the plan, Schwarz Digits contributes its STACKIT cloud. Bull brings its experience in AI and high-performance computing on large projects. The stated scope runs from servers to the software platform and appliance environment. "Together, we demonstrate that Europe can deliver high-performance innovation entirely on its own terms," said Bernie Wagner, Schwarz Digits' chief revenue officer.

Emmanuel Le Roux, Bull's chief executive, said the partnership contributes to building a sovereign digital infrastructure in Europe. He said it reflects the company's commitment to a resilient and competitive European ecosystem.

Servers from Angers, software through STACKIT

Servers would be built at Bull's Angers factory in France. The plant produces rack-scale AI systems, and the servers would use the company's direct liquid cooling technology. The BullSequana AI platform will be sold through the STACKIT Marketplace to companies and public-sector customers. The companies say the combination should deliver energy efficiency alongside greater digital sovereignty.

Bull's efficiency claims have some backing. In June its systems took the top three places in the Green500 ranking of energy-efficient supercomputers, the company said.

Bull also built the JUPITER supercomputer in Germany, which it calls Europe's most powerful. Beyond those first steps, the two companies intend to co-design servers based on Open Compute Project standards. They also plan work on SAP RISE integration and large high-performance computing projects, and will explore quantum computing integration.

The demand case: regulated data and a concentrated market

The cooperation targets regulated and strategic sectors. It aims to keep sensitive data, infrastructure and operations under European jurisdiction and control. That is the commercial argument. It targets buyers who treat data location as a procurement condition, not a preference.

Market concentration gives the pitch its edge. Amazon, Microsoft and Google hold about two-thirds of the global cloud market and about 70% of the European market, according to an NEC IISE report. The same report argues that sovereignty is less about excluding foreign suppliers than about diversifying them. It also means keeping legal and operational control and preserving the ability to switch.

Public-sector buying is already moving. Gov Digital, a cooperative of public-sector IT providers in Germany, awarded IONOS a contract for file hosting and collaboration tools in schools in six German states, Cybernews reported. The platform runs in IONOS data centres in Germany.

Schwarz Digits and Bull say demand for sovereign cloud is growing rapidly. They cite geopolitical developments, regulatory requirements and business pressure for greater digital sovereignty. Chancellor Friedrich Merz said a day before the announcement that Germany and Europe must build their own AI more quickly.

What is not settled

The announcement is a memorandum of understanding, not a binding supply contract. Neither company has said what the cooperation is worth or when deliveries would begin.

The concrete items are narrow: the BullSequana AI platform on the STACKIT Marketplace and co-designed OCP servers. SAP RISE integration, large HPC projects and quantum work are described as intended or exploratory.

What to watch

Both companies say the initial collaboration is meant to create room to expand into new areas of joint innovation over time.

Neither side has published a price list, a named customer or a delivery schedule for the joint stack. The BullSequana AI platform's arrival on the STACKIT Marketplace has no published date.

The legislative track runs alongside. The European Parliament's EPP Group will hold a hearing on the Cloud and AI Development Act and Chips Act 2.0 on 18 November. Two panels will cover semiconductors and scaling European cloud and AI infrastructure. MEPs will use it to feed into parliamentary work on both bills.