The research institutes in London listed here are predominantly large universities and medical research centers. Notable examples include UCL, a leading multidisciplinary university, King's College London, known for world-class education and research, and Imperial College London, specializing in science, medicine, engineering, and business. The London School of Economics and Political Science (LSE) is a prominent university focused on social sciences. Cancer Research UK (CRUK) is dedicated to cancer research, prevention, diagnosis, and treatment.
A clear pattern among these organizations is their concentration in London and their focus on higher education and research services. The UK Health Security Agency, founded in 2021, and The Francis Crick Institute, established in 2011, represent some of the newer institutions among those founded in the 19th and early 20th centuries.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 | 24,678 | ||||
| 2 |
King's College Londonkcl.ac.uk
Top-ranked university offering world-class education and research, fostering innovation and positive societal impact globally and locally. |
20,705 | |||
| 3 |
Imperial College Londonimperial.ac.uk
Leading university specializing in science, medicine, engineering, and business, fostering interdisciplinary collaboration to advance knowledge and improve health. |
18,233 | |||
| 4 |
The London School of Economics and Political Science (LSE)lse.ac.uk
A leading university specializing in the social sciences, committed to excellence and innovation in research and education |
9,613 | |||
| 5 |
Queen Mary University of Londonqmul.ac.uk
A world-leading research university with over 32,000 students from 170+ nationalities, offering 240+ degree programs and recognized for excellent teaching |
8,803 | |||
| 6 |
Cancer Research UK (CRUK)cancerresearchuk.org
Dedicated to cancer research, prevention, diagnosis, and treatment, funded by public donations to improve survival and quality of life. |
5,433 | |||
| 7 |
City St George鈥檚, University of Londoncity.ac.uk
An innovative university in London, transforming lives through education, research, and global impact, with strong ties to business and sustainability |
5,160 | |||
| 8 |
London Business Schoollondon.edu
Top-ranked business school offering MBA and executive education with global presence, diverse faculty, and extensive alumni network. |
4,266 | |||
| 9 |
UK Health Security Agencywww.gov.uk
The company is an executive agency responsible for planning, preventing, and responding to external health threats at national and global levels |
3,430 | |||
| 10 |
London School of Hygiene and Tropical Medicine, U. of Londonlshtm.ac.uk
Leading public health university with hubs in UK, Uganda, and The Gambia focused on research and postgraduate education for global health. |
2,522 | |||
| 11 |
SOAS University of Londonsoas.ac.uk
Inspires students globally to develop ideas for a fairer, sustainable world, fostering critical thinking, language learning, and engagement with international issues. |
2,322 | |||
| 12 |
Moorfields Eye Hospital, Londonmoorfields.nhs.uk
A leading eye hospital in London providing clinical care, research, and education, treating a wide range of eye conditions and conducting ophthalmic research |
2,054 | |||
| 13 |
Birkbeck, University of Londonbbk.ac.uk
A prominent research and educational institution in London offering high-quality academics and a bustling evening university experience |
1,967 | |||
| 14 |
The Francis Crick Institutecrick.ac.uk
Multidisciplinary scientists conducting innovative biomedical research to understand human health and disease, fostering discovery and future science leaders. |
1,957 | |||
| 15 |
Natural History Museumnhm.ac.uk
The company is a leading science research center and visitor attraction with vast collections, expertise, and a mission to tackle global challenges |
1,731 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 16 |
The Institute of Cancer Researchicr.ac.uk
Leading cancer research organization and postgraduate college focused on cancer discoveries, treatment, and education with a hospital partnership. |
1,608 | |||
| 17 |
Royal Veterinary Collegervc.ac.uk
Largest vet school offering accredited veterinary medicine and nursing programs, leading research, and support through major referral hospitals. |
1,507 | |||
| 18 |
Royal College of Artrca.ac.uk
Specialist postgraduate university offering art, design, architecture, and humanities programs focused on innovation, research, and global challenge solutions. |
1,452 | |||
| 19 |
UCL Institute of Educationucl.ac.uk
A leading institution dedicated to education and social science research globally, shaping policy, fostering partnerships, and reducing inequalities through education |
1,406 | |||
| 20 |
The British Librarybl.uk
National library providing access to over 170 million items including historical documents, contemporary media, and digital content for inspiration and research. |
1,326 | |||
| 21 |
The British Museumbritishmuseum.org
Museum preserving and exhibiting global cultural artifacts, offering educational exhibitions and events to engage millions of visitors annually. |
1,321 | |||
| 22 |
Zoological Society of London (ZSL)zsl.org
Science-driven conservation organisation restoring wildlife, protecting species, restoring ecosystems, collaborating globally, inspiring support, and creating sustainable solutions. |
1,135 | |||
| 23 |
National Centre for Social Researchnatcen.ac.uk
The National Centre for Social Research conducts independent, not-for-profit social research to give the public a voice in shaping impactful services |
798 | |||
| 24 |
Bayes Business Schoolbayes.citystgeorges.ac.uk
A leading global business school offering world-class business education, cutting-edge research, and strong connections with the business world |
785 | |||
| 25 |
RSSBrssb.co.uk
An independent safety, standards, and research body for Britain's rail network, improving safety, efficiency, and sustainability through collaboration, innovation, and best practices |
758 | |||
| 26 |
Cochranecochrane.org
A global network providing high-quality research summaries to empower healthcare decision-making, free from commercial influence for over 30 years |
698 | |||
| 27 |
Institute of Psychiatry, Psychology & Neurosciencekcl.ac.uk
A leading research and education center in Europe for psychiatry, psychology, and neuroscience, focusing on understanding, preventing, and treating mental and neurological conditions |
676 | |||
| 28 |
The Royal Central School of Speech and Dramacssd.ac.uk
Specialist conservatoire within University of London offering theatre and performance degrees, combining practical training, production, and cutting-edge research in the field |
610 | |||
| 29 |
Trinity Labantrinitylaban.ac.uk
In 2005, Trinity College of Music and Laban merged to create the world-leading conservatoire of music and dance in the UK |
568 | |||
| 30 |
Genomics Englandgenomicsengland.co.uk
collaboration with NHS to integrate genomic testing into routine healthcare, supporting research and development of targeted medicines |
566 | |||
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How this list is built
Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 12, 2026.
More company lists in London
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