In 2025, European tech companies raised more than €2.4 billion in seed funding, representing 3.3 per cent of the total €72 billion raised across the sector. While seed rounds accounted for a relatively small share of overall capital, they made up 14.2 per cent of all tech deals, highlighting the ongoing role of early-stage investment in the European tech ecosystem.
The largest seed rounds were concentrated in a limited number of countries, most notably the UK, Germany, France, the Netherlands and the Nordic region.
By industry, software and artificial intelligence led both in deal count and in the largest round sizes, reflecting continued investor interest in scalable, AI-driven businesses. Fintech, healthcare, and climate and energy followed with steady seed activity across several markets. Deeptech, robotics, semiconductors and quantum appeared less frequently, but indicate growing interest in more capital-intensive, long-term technologies.
Below, we highlight 15 companies that closed the largest seed rounds in 2025.
Gradium (France)
Amount raised in 2025: $70M
Gradium is an AI technology company that develops advanced audio language models to power natural, expressive, and ultra-low-latency voice interactions at scale.
Its platform unifies capabilities like real-time speech generation, transcription, transformation, and dialogue into a single neural architecture designed for seamless, human-like voice experiences. Gradium’s technology supports high-quality text-to-speech and speech-to-text in multiple languages and is built to enable scalable voice applications across industries.
Gradium raised $70 million in seed funding to advance and scale its audio language models, with a focus on delivering natural, expressive, ultra-low-latency voice interactions.
Mirelo (Germany)
Amount raised in 2025: $41M
Mirelo AI is a German artificial intelligence company that develops cutting-edge generative audio technology to bring sound and music to silent video content.
Through its platform, creators can upload videos and instantly generate perfectly synchronised sound effects, ambience, and music, with intuitive controls to fine-tune the results. Built on advanced foundational AI models and accompanied by APIs for integration into other products, Mirelo addresses a long-standing gap in audiovisual production by automating and enhancing the creation of immersive audio for video, games, films, social media and other media formats.
Mirelo has raised $41 million in a seed round to accelerate the growth and development of its AI-driven audio technology.
Donut Lab (Finland)
Amount raised in 2025: €25M
Donut Lab is a technology company redefining electric mobility with a unified platform of high-performance EV components.
It develops advanced in-wheel electric motors, production-ready solid-state batteries, integrated control hardware, and software that simplify and accelerate electric vehicle design and manufacturing for automotive, powersports, industrial, and other sectors. Donut Lab’s innovations aim to boost efficiency, reduce complexity, and unlock new possibilities in electrification across land, sea and air.
Donut Lab has raised €25 million in seed funding to expand R&D, scale manufacturing and operations, grow its international team, and accelerate commercial partnerships to bring its plug-and-play electric mobility components to market across multiple industries.
Tulum Energy (Italy)
Amount raised in 2025: $27M
Tulum Energy is a climate-tech startup developing a scalable and cost-effective way to produce clean (turquoise) hydrogen using methane pyrolysis.
The process splits methane into hydrogen and solid carbon without CO₂ emissions, helping hard-to-decarbonise industries like steel, chemicals, and refining transition to lower-carbon energy.
Tulum Energy has secured $27 million in seed funding to develop hydrogen production technology based on methane pyrolysis.
Arago (France)
Amount raised in 2025: $26M
Arago is a deeptech company developing a new class of energy-efficient AI processors powered by light to address the growing computational and power challenges of modern artificial intelligence.
Arago’s proprietary photonic processor uses light (photons) instead of traditional electronic transistors to deliver high-performance AI compute with significantly lower energy consumption, while remaining compatible with existing AI software and infrastructure.
Arago raised $26 million to accelerate the commercialisation of its photonic processor, codenamed “JEF”.
Maisa AI (Spain)
Amount raised in 2025: $25M
Maisa AI is an enterprise AI platform that helps large organisations automate complex, knowledge-intensive business processes by creating and deploying AI-powered “Digital Workers.”
Unlike traditional automation or generative models, Maisa’s system focuses on traceable, reliable, and auditable execution of workflows, enabling non-technical teams to build and scale intelligent automation using natural language. Its technology is designed to reduce errors and improve compliance across regulated industries while unlocking measurable operational efficiency.
Maisa AI secured $25 million in seed funding to expand the team and to scale out the self-serve platform, Maisa Studio.
Paid (UK)
Amount raised in 2025: €21M
Paid.ai is a technology company building an all-in-one revenue engine tailored for AI agents, software agents that act autonomously to perform work for businesses.
Its platform helps companies track AI-related costs, manage pricing and subscriptions, automate billing and payments, and report on margins and value delivered by AI agents, replacing legacy SaaS billing systems that aren’t designed for AI-driven products. Paid.ai enables flexible, outcome-focused monetisation and financial operations for organisations deploying autonomous AI workflows.
Paid.ai raised €21 million in seed funding to develop its results-based billing infrastructure using AI agents and expand its reach to more corporate clients. Just a few months before, the company closed a €10 million pre-seed funding round.
Vertical Compute (Belgium)
Amount raised in 2025: €20M
Vertical Compute is a deeptech semiconductor company developing next-generation vertically integrated memory and compute technologies to overcome the performance and energy bottlenecks in AI and data-intensive computing.
Its proprietary chiplet-based approach brings data much closer to processing, unlocking faster, more efficient hardware that can better support large-scale AI and advanced applications.
Vertical Compute raised €20 million in seed funding to tackle AI chips’ memory bottleneck.
DePoly (Switzerland)
Amount raised in 2025: $23M
DePoly is a climatetech company developing a novel chemical recycling process that breaks down PET plastics and polyester waste into high-quality raw materials used to make new plastics, helping reduce landfill, incineration, and dependence on fossil fuels.
Its technology can handle dirty, mixed or difficult-to-recycle streams and aims to support a truly circular plastics economy by converting waste back into materials that meet industry standards.
DePoly secured $23 million in seed to launch a PET recycling plant in Switzerland.
Noah (UK)
Amount raised in 2025: $22M
Noah is a fintech company building API-first payment infrastructure that enables businesses to move money across borders instantly, transparently and at lower cost by combining traditional fiat systems with stablecoin technology.
Its platform supports real-time settlements, multiple currencies, and compliant global payment rails, helping companies simplify international money transfers and access the global financial system more efficiently.
Noah has raised $22 million in seed funding to build foundational infrastructure for fast, compliant, and cost-effective global payments using stablecoins.
THEKER Robotics (Spain)
Amount raised in 2025: $21M
THEKER Robotics is a robotics and artificial intelligence company that builds intelligent automation systems capable of operating in complex, real-world industrial environments.
THEKER combines deep learning, computer vision and adaptive robotics to automate tasks across sectors like waste management, logistics, food and manufacturing, offering customizable “robots as a service” that can recognise diverse objects and work reliably without extensive reprogramming.
THEKER closed a $21 million seed round to expand its technical team, scale its production capacity, and strengthen its international presence.
Endra (Sweden)
Amount raised in 2025: $20M
Endra is an AI-powered platform specifically built to modernise mechanical, electrical, and plumbing (MEP) engineering design.
Using advanced artificial intelligence, generative design, and automation, Endra transforms traditionally manual workflows (such as system layout, 3D modelling, documentation, and code compliance) into fast, automated processes that integrate seamlessly with tools like Autodesk Revit.
The platform helps MEP engineers and design firms generate coordinated 3D/2D models, schedules, diagrams, and other documentation with drastically reduced turnaround times, boosting productivity and reducing repetitive work.
Endra closed a $20 million seed round (following a €3 million pre-seed completed a few months earlier) which will be used to support the company’s next phase of growth.
Jack & Jill (UK)
Amount raised in 2025: $20M
Jack & Jill is a startup building an AI-powered recruitment platform that uses conversational agents to streamline hiring and job search.
Its system pairs two AI agents, Jack, who engages job seekers in dialogue to understand their skills and goals and recommends relevant roles, and Jill, who works with employers to profile open positions and match them with well-suited candidates.
The platform aims to make recruitment more efficient, personal and scalable than traditional job boards or agencies by automating screening, matching and introductions at scale.
Jack & Jill has secured $20 million in seed funding to expand its AI-powered recruitment platform to the United States.
Motor Ai (Germany)
Amount raised in 2025: $20M
MOTOR Ai is a tech company developing Level 4 autonomous driving software that is designed to be safe, explainable and compliant with European safety standards.
Instead of relying on massive training data, its AI uses cognitive-inspired reasoning to perceive and understand complex traffic situations, enabling vehicles to make transparent decisions in environments they haven’t seen before. MOTOR Ai’s technology targets public transport and urban mobility solutions with the goal of certified, scalable autonomous mobility.
MOTOR Ai closed a $20 million seed funding round to bring its certified, neuroscience-driven technology into full deployment, starting with German public roads.
Octonomy (Germany)
Amount raised in 2025: $20M
Octonomy is a company that builds intelligent AI agents to automate complex business support and service processes with human-level accuracy.
Its platform understands technical documents, ERP/CRM systems, and workflows to deliver reliable end-to-end resolutions, reducing manual effort and enabling teams to scale without growing headcount. Designed for enterprise environments, Octonomy’s technology aims to make expert knowledge operational and automate work that traditional AI often fails to handle.
Octonomy completed a $20 million seed round to accelerate the development and deployment of Octonomy’s agentic AI platform for complex service workflows.
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