The Tech.eu Q3 2025 Report reveals that European tech companies raised €21 billion across over 900 deals during the third quarter of 2025.
Approximately 14.1 per cent of these companies successfully closed seed rounds, amounting to over half a billion euros (€587.8 million).
Today, we share the list of the 10 largest seed rounds among European tech companies that were completed in Q3 2025.
Donut Lab (UK)
Amount raised: €25M
Donut Lab is a company that offers a full-stack EV hardware platform featuring modular, plug-and-play components including in-wheel motors, batteries, compute units, and software.
Their in-wheel “Donut Motors” deliver high torque and power density, eliminating the need for traditional drivetrains. The platform is designed for electric mobility across land, air, marine, and robotics markets. Donut Lab’s modular approach reduces development complexity and accelerates time to market.
In July, the company raised €25 million in seed funding, supporting the validation of Donut’s drivetrain-free architecture, engineered for flexible use across land, sea, and air applications.
Tulum Energy (Italy)
Amount raised: $27M
Tulum Energy is a climate-tech company developing a methane pyrolysis platform to produce “turquoise” hydrogen and solid carbon from natural gas or biogas, without CO₂ emissions.
The technology repurposes electric arc furnaces commonly used in steel production to crack methane molecules thermally, enabling a scalable, energy-efficient route to hydrogen.
Tulum aims to bring hydrogen production costs down to parity with conventional grey hydrogen, positioning its technology as a viable, lower-emission alternative in heavy industries.
In July 2025, the company secured a $27 million seed round to build a pilot plant in Pesquería, Mexico, within Ternium’s industrial complex.
Arago (France)
Amount raised: $26M
Arago is a Paris-based AI and computer hardware company developing an energy-efficient photonic AI processor that uses light instead of electricity, paired with a full software stack for standard framework compatibility.
The approach targets data centres and edge AI with high throughput and significantly lower power consumption.
Arago raised $26 million in seed funding in July to accelerate the commercialisation of its photonic processor, codenamed “JEF”.
Maisa AI (Spain)
Amount raised: $25M
Maisa is an enterprise automation company building accountable AI agents that execute complex, decision-heavy workflows with full traceability.
Its platform provides a “Chain of Work”, a step-by-step, auditable record of every action, decision, tool, and rule used, so teams can deploy digital workers that are explainable and compliant rather than black boxes. Maisa is model-agnostic and offers developer docs and a studio for building agents, alongside its research into the Vinci Knowledge Processing Unit (KPU) to improve reasoning and tool use at inference time.
Following a $25 million seed round closed in August, the company launched Maisa Studio, a model-agnostic, self-serve platform that enables users to deploy digital workers trainable through natural language.
Paid (UK)
Amount raised: €21M
Paid is a business engine built for AI agents, managing pricing, subscriptions, margins, billing, and renewals with minimal integration.
It allows agent companies to monetise automatically, track per-agent profitability, and implement outcome- or usage-based pricing models without building custom billing infrastructure. The company aims to help AI agent developers capture more value and scale revenue operations.
The company closed a €21 million seed round in September to further develop its results-based billing infrastructure for AI agents and expand its offering to more enterprise customers.
Motor Ai (Germany)
Amount raised: $20M
Motor Ai is a Berlin-based startup working to accelerate the development of autonomous mobility systems.
It offers an operating system for robots and vehicles that handles perception, planning, and control, enabling developers to build and deploy autonomous agents. Motor AI combines modular software architecture with real-world data to support robotic delivery, autonomous shuttles, last-mile logistics, and mobility applications.
MOTOR Ai closed a $20 million seed round to deploy its certified, neuroscience-based autonomous driving technology, beginning with public road trials in Germany.
THEKER Robotics (Spain)
Amount raised: $18M
THEKER Robotics is a company specialising in AI-driven inspection robotics and infrastructure solutions.
Its technology enables autonomous visual inspection of industrial facilities such as pipelines, bridges, and offshore equipment using drones and robotic platforms. THEKER Robotics integrates advanced perception, simulation, and automation to improve safety, reduce downtime, and lower inspection costs.
In July, the company raised $18 million to advance AI-driven industrial automation.
Kongsberg Ferrotech (Norway)
Amount raised: €12M
Kongsberg Ferrotech provides robotic solutions for inspection, repair, and maintenance (IRM) of underwater infrastructure in the energy and maritime sectors.
Using remotely operated robots, it offers all subsea IRM services in a single operation. Since 2021, it has been collaborating with Equinor, SINTEF, and Gassco to develop in situ 3D metal-to-metal printing for underwater repairs.
In July, the company raised €12 million to advance its technology for improving the repair and maintenance of critical underwater infrastructure worldwide.
Brainr (Portugal)
Amount raised: €11M
Brainr is a company that develops AI agents to review, verify, and summarise video content at scale.
Its system uses multimodal reasoning across video, audio, and visual metadata to automatically detect events, anomalies, and quality issues. Clients in media, sports, and brand safety use Brainr’s agents to streamline monitoring workflows, reduce moderation costs, and enhance trust in content.
With €11 million raised in September, BRAINR plans to support key growth initiatives, including international expansion to new regions and facilities, and to accelerate its research and development in artificial intelligence.
Conduct (UK)
Amount raised: $12M
Conduct.ai is a startup developing autonomous agents for workplace automation.
Its platform enables users to deploy AI agents that execute multi-step workflows, such as document review, data entry, or complex decision paths, and integrates with enterprise systems and business tools. Conduct.ai emphasises transparency, audit Trails, and user control, aiming to give organisations scalable, responsible automation.
In September, Conduct closed a $12 million seed round and emerged from stealth with a mission to lead the largest transformation in enterprise IT by modernising legacy ERP systems
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