Mistral AI announced a €3 billion Series D on September 8, 2026, at a post-money valuation of more than €21 billion, to build "sovereign, open-weight AI" for Europe. The round was led by Samsung Electronics, which is headquartered in Suwon, South Korea. If you pick an LLM provider for data-residency reasons, or you are deciding whether open weights from a European lab are worth their price, this round changes what Mistral can build and who it answers to. TL;DR €3B Ser...