Europe’s biggest seed rounds of Q3 2026: Top tech startups to watch

In Q3 2026, European tech companies raised a total of €27.8 billion across 732 deals, marking an increase from previous quarters. The UK led European funding with €12 billion, constituting 43% of the total capital raised. AI attracted €6.7 billion, accounting for about 24% of all capital raised. Here are the top 10 largest seed rounds completed by European tech companies in Q3 2026:

1. Callosum, a UK AI infrastructure company, raised $100 million to develop and scale its AI infrastructure platform.

2. Munich-based microagi secured $55 million to scale its Atlas platform and expand globally.

3. Aptadir Therapeutics, a Milan-based biotech, raised $45 million to advance its pipeline of RNA-based therapies.

4. Agon, a UK defence technology firm, received $30 million to scale its virtual environments for training AI-powered autonomous systems.

5. Gradium, a Paris-based AI voice technology company, raised around $30 million to support its voice AI development and scaling.

6. ZuriQ, an ETH Zürich spin-off, secured $25.5 million to expand its quantum processor team and R&D.

7. INLEAP Photonics, a German company, raised €20 million to accelerate production and testing of its high-precision laser beam steering systems.

8. Atira, a Munich-based AI orchestration platform developer, announced $17.5 million to accelerate product development and international growth.

9. Stockholm-based eComID raised $17 million to enter new markets and expand its Shopping Passport technology.

10. iPremom, a Valencia-based medtech, secured €15 million to support clinical validation of its pregnancy complication detection platform.