Top AI companies in London

Companies building AI products, foundation models, and applied ML platforms. Filtered to companies headquartered in London.

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Built from a search like: “Top AI companies in London”

Ranked by current headcount across AI companies headquartered in London. Refreshed daily.

1
UCL· London, England, United Kingdom
UCL (University College London) is London's leading multidisciplinary university, ranked 9th in the QS World University Rankings.Established in 1826 UCL opened up education in England for the first time to students of any race, class or religion and was also the first university to welcome female students on equal terms with men. Today UCL is made up of remarkable people: eminent professors and exceptional students. Academic excellence and conducting research that addresses real-world problems inform our ethos to this day.To see more photos of UCL you can visit our Flickr Gallery:www.flickr.com/photos/uclnews/sets/ To view videos of UCL and our work, you can subscribe to our YouTube Channel:http://www.youtube.com/user/UCLTVLooking for a job at UCL? Find out more about working with us and view the latest vacancies:https://www.ucl.ac.uk/jobs
- Grant
- 24.7k employees
2
King's College London· London, England, United Kingdom
King’s College London is amongst the top 35 universities in the world and 5th best in the UK (QS World University Rankings 2026), and one of England’s oldest and most prestigious universities. With an outstanding reputation for world-class teaching and cutting-edge research, King’s maintained its sixth position for ‘research power’ in the UK (2021 Research Excellence Framework). King's has more than 33,000 students (including more than 12,800 postgraduates) from some 150 countries worldwide, and 8,500 staff. King's has more than 33,000 students (including more than 12,800 postgraduates) from some 150 countries worldwide, and 8,500 staff. For nearly 200 years, King’s students and staff have used their knowledge and insight to make a positive impact on people, society and the planet. Focused on delivering positive change at home in London, across the UK and around the world, King’s is building on its history of addressing the world’s most urgent challenges head on to accelerate progress, make discoveries and pioneer innovation. Visit the website to find out more about Vision 2029, which sets out bold ambitions for the future of King’s as we look towards our 200th anniversary.World-changing ideas. Life-changing impact: kcl.ac.uk/news
- Grant
- 20.7k employees
3
Imperial College London· London, England, United Kingdom
Consistently rated in the top 10 universities in the world, Imperial College London is the only university in the UK to focus exclusively on science, medicine, engineering and business.At Imperial we bring together people, disciplines, industries and sectors to further our understanding of the natural world, solve major engineering problems, lead the data revolution and improve health and well-being.
- Grant
- 18.2k employees
- Founded 1907
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4
Google DeepMind· London, England, United Kingdom
We’re a team of scientists, engineers, machine learning experts and more, working together to advance the state of the art in artificial intelligence. We use our technologies for widespread public benefit and scientific discovery, and collaborate with others on critical challenges, ensuring safety and ethics are the highest priority.Our long term aim is to solve intelligence, developing more general and capable problem-solving systems, known as artificial general intelligence (AGI). Guided by safety and ethics, this invention could help society find answers to some of the world’s most pressing and fundamental scientific challenges. We have a track record of breakthroughs in fundamental AI research, published in journals like Nature, Science, and more.Our programs have learned to diagnose eye diseases as effectively as the world’s top doctors, to save 30% of the energy used to keep data centres cool, and to predict the complex 3D shapes of proteins - which could one day transform how drugs are invented.
- Series A
- 10.3k employees
- Founded 2010
5
The Francis Crick Institute· London, England, United Kingdom
The Crick is a distinctive biomedical research institute. We’re committed to advancing, promoting, and sharing understanding of human health and disease. We do that by attracting talented and ambitious people from all disciplines and backgrounds and giving them the support and freedom they need to succeed.Inside the Crick, you’ll discover scientists working to stretch the very limits of what we know about how life works. Their research holds the key to answering fundamental questions about human health and disease. Our bold and innovative research projects bring together scientists and technicians from all disciplines in the pursuit of discovery without boundaries.With the support of our partners, we’re bridging the gap between discovery and application to help change lives for the better. And through our dynamic structure, we’re able to develop the science leaders of tomorrow.That’s our bold idea, tell us yours.Cover image taken at the Crick by Thomas Angus, Imperial College London.
- Convertible note
- 2k employees
- Founded 2011

6
LGC· London, England, United Kingdom
LGC is a global leader in life sciences, diagnostics and analytical solutions. We work with partners around the world to address some of society’s most important challenges, from diagnosing disease and enabling new treatments to supporting food security and protecting public health.Our science underpins discovery, enables better health outcomes and helps safeguard the integrity of food, water, medicines and the environment. Every day, we provide the components, standards and services that laboratories, manufacturers and regulators rely on to make confident, evidence-based decisions.With operations in 14 countries and more than 180 years of scientific expertise, our work supports public health and sustainability at a global scale. From improving the accuracy of medical testing and verifying the safety of food products, to helping scientists develop the next generation of medicines, our solutions are trusted by customers in more than 170 countries.
- 2k employees
- Founded 1996
7
National Physical Laboratory (NPL)· Teddington, England, United Kingdom
NPL is the UK’s National Metrology Institute, providing the measurement capability that underpins the UK's prosperity and quality of life.From new antibiotics to tackle resistance and more effective cancer treatments, to secure quantum communications and superfast 5G, technological advances must be built on a foundation of reliable measurement to succeed. Building on over a century’s worth of expertise, our science, engineering and technology provides this foundation. We save lives, protect the environment and enable citizens to feel safe and secure, as well as support international trade and commercial innovation.As a national laboratory, our advice is always impartial and independent, meaning consumers, investors, policymakers and entrepreneurs can always rely on the work we do.Measure Up: Stay informed about all things NPL
- 1.8k employees
8
The Institute of Cancer Research· London, England, United Kingdom
The Institute of Cancer Research is making the discoveries that defeat cancer. In addition to being one of the world's most influential cancer research organisation, we are also a postgraduate college (a member of the University of London), and a charity.Our outstanding record of achievement dates back more than 100 year and together with our hospital partner, The Royal Marsden NHS Foundation Trust, we are rated in the top four centres for cancer research and treatment worldwide.
- Grant
- 1.6k employees
- Founded 1909
9
Royal Botanic Gardens, Kew· Richmond Upon Thames, England, United Kingdom
Kew is the world’s leading botanic gardens, at the forefront of plant and fungal science, a UNESCO World Heritage Site and a major visitor attraction.We want a world where plants and fungi are understood, valued and conserved – because our lives depend on them. We use the power of our science and the rich diversity of our gardens and collections to provide knowledge, inspiration and understanding of why plants and fungi matter to everyone. See www.kew.org for more information or https://careers.kew.org to view our current career opportunities.
- 1.4k employees
10
Perceptive Inc.· London, England, United Kingdom
Expanding on their combined 50-year history, Perceptive provides best-in-class specialist support to global pharmaceutical, biotech, and clinical research organizations, spanning the complete R&D lifecycle, from discovery and preclinical through clinical development to post marketing. Perceptive’s offerings include imaging biomarkers and core lab services, as well as innovative technologies in randomization and trial supply management (RTSM), analytics, and software.
- Private equity
- 1.3k employees
- Founded 1996

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Find engineers at AI companies in London

London has long been a hub for AI, and the list above ranks the largest AI companies headquartered there by current headcount, drawn from public LinkedIn and Crunchbase records. With 694 matching companies in Refolk’s index, this is a good map of where the AI talent in London lives - useful whether you’re recruiting, partnering, or sizing a market.

The biggest AI companies in London tend to be the gravitational centres for specialised talent - senior engineers, ML researchers, applied scientists, designers - while the smaller ones compete on speed, equity, and proximity to founders.

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How this list is built

Refolk pulled AI companies headquartered in London from public LinkedIn and Crunchbase records, ranked them by current employee count, and kept those with at least 10 employees. The list refreshes once a day.

Last refreshed: Wed, 05 Aug 2026 17:36:35 GMT

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The list draws on the public company graph - headcount and growth signals, funding history, and recency. The criteria chips at the top show exactly which filters produced it, and the methodology section explains the ranking.

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