AI startup ecosystem
Artificial intelligence is one of Europe's fastest-growing startup sectors, with hubs in London, Paris, Berlin, and Helsinki driving advances in generative AI, computer vision, and NLP. European AI startups benefit from strong academic research, increasing VC specialisation, and growing enterprise demand across industries. We track 929 organisations in this sector across 6+ countries.
Showing 621–640 of 929AI
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Ontotext
Ontotext is a Sofia-based semantic-technology company that builds GraphDB, one of the leading commercial RDF-native graph databases, together with a suite of text-analysis and knowledge-graph tools used by media organizations, pharmaceutical companies, intelligence agencies, and financial institutions to turn unstructured content into structured, queryable knowledge. The BBC famously used Ontotext's semantic platform to power its 2010 World Cup and 2012 Olympics sites — one of the earliest high-profile production deployments of a knowledge graph at a major media brand — and the company has since expanded into clinical research, drug discovery, and enterprise retrieval-augmented generation (RAG) pipelines where graph-structured knowledge is paired with LLMs. Founded in 2000 as a spin-off from Sirma Group, Ontotext is a rare example of a deep, patient, deep-tech European knowledge-engineering company that predated the current AI wave and is now a load-bearing piece of several enterprise RAG stacks.
Onum
Onum is a real-time telemetry-pipeline platform that ingests, enriches, filters and routes large volumes of security and observability data before it reaches a SIEM or data lake, cutting storage costs and speeding incident response. Acquired by CrowdStrike in 2025.
Open Circle Capital
Open Circle Capital is a Vilnius-based early-stage fund founded in 2017, backed two-thirds by the Lithuanian public institution INVEGA and one-third by private investors, with a mandate to invest up to €20 million in the commercialisation of Baltic technology. The fund targets ICT, robotics, high-tech, AI, and IoT companies primarily in Lithuania and Northern Europe, writing seed-stage cheques. Its 17-company portfolio has recorded three acquisitions — Frontu, Eddy Travels, and Paysolut — and the partners collectively bring experience spanning more than 80 technology-transfer transactions and seven previous funds. The team has prior exit history with global acquirers including Facebook, Saab, and Eli Lilly.
Open Conf 2026
An annual tech conference at the Dais Events center in Marousi, Athens, supported by the Greek software and IT sector including major companies, open communities, startups, hubs and research centers. The 2026 edition centers on AI-Native Engineering, Tech with Impact and Software Craftmanship, drawing 700+ attendees across talks, panels, mentoring and tech challenges.
Open Mercato
Open-source, AI-native commerce and operations framework co-founded in 2025 by Piotr Karwatka (creator of Vue Storefront / Alokai) and Tomasz Karwatka (founder of Divante). It provides modular infrastructure for building custom commerce, ERP and finance software with AI-assisted engineering, combining SaaS speed with bespoke flexibility.
OpenOcean
OpenOcean is a pan-European seed and Series A venture capital firm operating from Helsinki. It invests in AI-native software, automation and foundational technology, with stated focus areas spanning AI-enabled services, horizontal and vertical AI automation, quantum and scalable AI computation, and agentic infrastructure and developer tooling.
OpenSlava 2026
The 14th edition of OpenSlava, Accenture's free conference on emerging technologies and open source held in Bratislava. The 2026 programme focuses on AI in the era of intelligent agents, with hands-on labs on day one and main-stage sessions on day two. The hybrid English-language event draws business and technology leaders, architects, software developers, students and educators from across Central Europe.
Oplane
Agentic security platform that automates threat modelling for engineering teams using AI coding tools like Cursor and GitHub Copilot. Continuously maps codebase architecture, flags security risks and delivers contextual remediations in developer workflows; in production at Miro and Tandem Health.
Orange Fab Poland
Corporate accelerator by Orange Polska (est. 2015) focused on 5G, IoT, AI, and customer experience. Provides proof-of-concept projects, telecom mentorship, and access to Orange's global Fab network in 18 countries. Scope: National with global reach.
Orbio Earth
Orbio Earth is a German climate-tech company providing satellite-based methane-emissions monitoring for the financial and energy sectors, helping operators detect leaks and prioritize emissions-reduction opportunities ahead of incoming regulation. Its platform delivers real-time measurement data for oil and gas infrastructure to support compliance and portfolio-risk management.
Orbital Materials
Orbital Materials is a London-based AI startup applying foundation models to materials science, with a focus on designing novel carbon-capture sorbents, thermal management materials, and clean-energy components. Founded by former DeepMind researchers, the company developed LINUS, a large-scale generative model for atomic structures that can predict material properties and propose new compositions. Orbital has raised over $22 million from investors including Khosla Ventures and Radical Ventures. The company bridges the gap between AI research and physical-world climate technology, representing a new class of UK deep-tech ventures using machine learning for industrial decarbonization.
Øredev 2026
Øredev is one of Europe's premier developer conferences, held annually in Malmö since 2005 and celebrating its 20th edition in 2026. The three-day program spans the whole software development process, including backend, frontend, AI, architecture, security, and team culture, drawing developers, architects, and tech leads from across the Nordics. A strong hiring and learning venue for engineering-heavy startups in the Öresund region.
Origin Robotics
Origin Robotics is a Latvian defence-tech company founded in 2022 by Agris Kipurs and Ilja Nevdah in response to Russia's invasion of Ukraine. The company develops advanced autonomous UAV systems combining AI computer vision with cost-effective hardware. Its flagship BEAK system is a man-portable, mid-range precision-guided weapon with a 15 km reach already deployed by Latvian and Ukrainian armed forces, while BLAZE is an autonomous counter-UAS interceptor using radar and AI vision. Origin has raised €4 million in pre-seed funding led by Change Ventures and secured an additional €4.5 million European Defence Fund grant.
Outcraft AI
Vilnius-based startup building an autonomous revenue engine—AI sales agents that engage prospects, qualify leads, and schedule meetings in real time across email and chat channels without human involvement for routine interactions. Raised €2M pre-seed from Practica Capital.
OutSystems
OutSystems is a Portuguese-founded low-code and agentic-development platform company that lets enterprises build and orchestrate applications and AI agents. Its platform spans agentic systems engineering, enterprise orchestration, industry-specific solutions, workflow automation and a data fabric layer, and it has grown into a global enterprise software vendor with a dual base in Portugal and the US.
Overmind
Overmind provides a security and control layer for agentic AI deployments in enterprise systems. The platform supervises autonomous agent behavior in live workflows and intervenes when actions appear unsafe, adversarially influenced, or outside policy constraints.
Overstory
Overstory is an Amsterdam-based climate-tech company providing AI-powered vegetation and wildfire intelligence for electric grid operators, helping utilities assess ignition risk and model vegetation-management tradeoffs around power lines. It is used by several of the largest utilities in North America to plan vegetation management and reduce wildfire risk to the grid.
Owkin
Owkin is a Paris-based AI biotech founded in 2016 that applies machine learning and federated learning across hospital and pharmaceutical datasets to discover drug targets, develop diagnostics and de-risk clinical trials. It partners with pharmaceutical companies including Sanofi and Bristol Myers Squibb, reached unicorn status, and has more recently launched agentic AI tools for biopharma research.
Oxylabs
Oxylabs, founded in 2015 and headquartered in Vilnius, provides web data collection infrastructure including a proxy network of over 175 million residential IPs, a Web Scraper API, and AI-powered data extraction tools. The company serves use cases in market research, ad verification, brand protection, and AI training data. In 2025 Oxylabs acquired French web scraping API provider ScrapingBee. It employs between 500 and 1,000 people across multiple locations.
Pactum AI
Pactum AI is a Tallinn-founded company, started in 2019 by Kaspar Korjus and Kristjan Korjus, that builds autonomous AI agents to run supplier negotiations at enterprise scale, handling pricing, payment terms, rebates, and contract complexity that traditional procurement workflows leave unsolved. Its agentic negotiation platform is used by more than 60 Global 2000 companies, including Walmart and Maersk, and the company reports negotiation volumes increased fivefold with millions of dollars in documented savings for customers. Pactum raised a EUR 18.4 million round in 2024 to expand its autonomous procurement platform.
