Mistral raises €3B in Series D at €21B valuation, largest European tech round ever

The French startup Mistral has closed a €3 billion equity round at a post-money valuation above €21 billion, making it the largest funding round ever completed by a European technology company. In just three years since its founding, the company — focused on open-weight models and the full infrastructure surrounding them — has attracted capital at a scale typically reserved for American giants.

Samsung Electronics led the round, joined as co-leads by the EQT-managed Scaleup Europe Fund and existing investor PSG Equity. New participants include Advent, funds and accounts managed by BlackRock, and the Grand Duchy of Luxembourg. A long roster of existing backers also re-upped: a16z, ASML, Belfius, BNP Paribas CIB, Bpifrance, Carmignac, DST Global, Eurazeo, General Catalyst, Headline, Hillspire, Index Ventures, Korelya Capital, Lightspeed, Nvidia, Phoenix Court's Solar fund — which pools LocalGlobe, Latitude and Solar — and Salesforce Ventures.

According to the company, the capital will fund a significant expansion of the frontier research underpinning its infrastructure, products and technological sovereignty; increase compute capacity for training more powerful models; broaden infrastructure; and accelerate commercial growth and international deployment. Mistral currently operates in 20 countries and serves more than 125 global organizations embedding AI into core operations, among them Airbus, ASML and HSBC.

The round reflects a shift in the industry's fundamental question. If the first wave of generative AI centered on who could build the most powerful model, enterprises and governments are now asking how to harness that power without surrendering control over infrastructure and the intelligence loop. Demand for performance combined with control, choice and independence is growing internationally, as customers weigh long-term technological dependence, data-governance requirements and deployment options in every AI investment.

Mistral claims to be the only AI company building the full stack required: open-weight models, the infrastructure and compute they run on, and the products that put them into production. The approach is designed to ensure customers are never locked into a single vendor's roadmap, pricing or availability. Open models allow organizations to build on them without exposing data, processes or institutional knowledge outside their own walls.

The company defines a "sovereign AI layer" as control across four dimensions: data that remains within organizational boundaries; models that are controllable and customizable; private, predictable compute; and production systems that are fully controllable and auditable. It is a substantial promise that, at this stage, rests on the company's own assertions rather than an external standard or published independent audit.

The fact that ASML led the Series C and Samsung now leads the Series D signals confidence from companies at the forefront of advanced manufacturing, engineering and industrial technology. These investors are betting that Mistral's semi-open-source approach and full infrastructure will let organizations embed advanced AI in complex real-world environments while retaining control over data, infrastructure and knowledge. The test will be delivering at the scale and reliability industrial enterprises demand.