Top Biotech companies in London

Companies applying biology, chemistry, and computation to therapeutics and tooling. Filtered to companies headquartered in London.

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

1
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
2
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
3
Autolus Therapeutics· London, England, United Kingdom
Autolus is a CAR T cell therapy company. We are applying our extensive programming capabilities to develop advanced autologous T cell therapies that have the potential to deliver life-changing therapies to patients with cancer and autoimmune diseases.
- Post-IPO equity
- 732 employees
- Founded 2014
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4
Genomics England· London, England, United Kingdom
Genomics England works with the NHS to bring forward the use of genomic healthcare and research in Britain to help people live longer, healthier lives. Genomics is a ground-breaking area of medicine that uses our unique genetic code to help diagnose, treat and prevent illnesses. Thanks to advanced technology, scientists can now compare many people’s genetic code to make new discoveries that continually improve genomic healthcare. In 2013, Genomics England and the NHS launched the 100,000 Genomes Project, demonstrating how genomics insights can help doctors across the NHS, and building a foundation for the future by assembling a unique dataset. Genomics England is now supporting the NHS to deliver genomic testing for patients as part of routine healthcare, and providing the health data and technology that researchers need to make new discoveries and create more effective, targeted medicines. We work with thousands of people – patients, doctors and scientists – to increase our collective knowledge and enable faster and deeper genomic research, to bring genomic healthcare to all who need it.
- 568 employees
- Founded 2013
5
MeiraGTx· London, England, United Kingdom
MeiraGTx (Nasdaq: MGTX) is a vertically integrated, clinical-stage genetic medicine company with a broad pipeline of late-stage clinical programs supported by end-to-end manufacturing capabilities. MeiraGTx has an internally developed manufacturing platform process, internal plasmid production for GMP, two GMP viral vector production facilities as well as an in-house Quality Control hub for stability and release, all fit for IND through commercial supply. MeiraGTx has core capabilities in viral vector design and optimization and a potentially transformative riboswitch gene regulation platform technology that allows for the precise, dose-responsive control of gene expression by oral small molecules. MeiraGTx is focusing the riboswitch platform on delivery of metabolic peptides including GLP-1, GIP, Glucagon and PYY using oral small molecules, as well as cell therapy for oncology and autoimmune diseases. Although initially focusing on the eye, central nervous system, and salivary gland, MeiraGTx has developed the technology to apply genetic medicine to more common diseases, increasing efficacy, addressing novel targets, and expanding access in some of the largest disease areas where the unmet need remains great.
- Post-IPO debt
- 420 employees
- Founded 2015

6
Isomorphic Labs· London, England, United Kingdom
Isomorphic Labs is here to advance human health by building on and beyond the Nobel-winning AlphaFold system. Our interdisciplinary team has developed a unified, state-of-the-art drug design engine that will transform how we design new drugs, and ultimately change the way medicine will help and heal people. Every day, and with each new breakthrough, we’re getting closer to achieving our ambitious mission to one day solve all disease
- Series B
- 402 employees
- Founded 2021
7
Phastar· London, England, United Kingdom
Phastar is an award-winning specialist biometrics and data science CRO, trusted by pharma, biotech, and medical device companies worldwide. With a global team of data specialists, it brings expertise, precision, and pace to every trial – because behind every data point is a patient waiting for treatment.Phastar doesn’t just deliver high-quality clinical trial data. It partners with clients to turn complexity into clarity. Leveraging technology, AI-enhanced analytics, advanced statistical methods, and deep therapeutic expertise, it accelerates regulatory approvals, ensures compliance with global standards and mitigates risk. Phastar has a proven track record in transforming complex data into clear, actionable intelligence, empowering its partners to accelerate drug development. With scalable, tailored solutions, it expedites trials – bringing life-changing therapies to patients faster.
- Private equity
- 371 employees
- Founded 2007
8
Cell and Gene Therapy Catapult· London, England, United Kingdom
The Cell and Gene Therapy Catapult was established as an independent centre of excellence to advance the growth of the UK cell and gene therapy industry, by bridging the gap between scientific research and full-scale commercialisation. With more than 300 employees focusing on cell and gene therapy technologies, it works with partners in academia and industry to ensure these life-changing therapies can be developed for use in health services throughout the world. It offers leading-edge capability, technology and innovation to enable companies to take products into clinical trials and provide clinical, process development, manufacturing, regulatory, health economics and market access expertise. Its aim is to make the UK the most compelling and logical choice for UK and international partners to develop and commercialise these advanced therapies. The Cell and Gene Therapy Catapult works with Innovate UK. For more information please visit ct.catapult.org.uk or visit http://www.gov.uk/innovate-uk.The Cell and Gene Therapy Catapult works with Innovate UK. For more information please visit ct.catapult.org.uk or visit http://www.gov.uk/innovate-uk.
- Grant
- 322 employees
- Founded 2012
9
Orchard Therapeutics - U.S.· London, England, United Kingdom
Orchard Therapeutics, a Kyowa Kirin company, is a global gene therapy leader focused on ending the devastation caused by genetic and other severe diseases by discovering, developing, and commercializing new treatments that tap into the curative potential of hematopoietic stem cell (HSC) gene therapy. In this approach, a patient’s own blood stem cells are genetically modified outside of the body and then reinserted, with the goal of correcting the underlying cause of disease with a single treatment.Founded in 2015, Orchard’s roots go back to some of the first research and clinical developments involving HSC gene therapy. Our team has played a central role in the evolution of this technology from a promising scientific idea to a potentially life-transforming reality. Today, Orchard is advancing a pipeline of HSC gene therapies designed to address serious diseases where the burden is immense for patients, families and society and current treatment options are limited or do not exist.For more information, please visit https://www.orchard-tx.com/.
- Post-IPO equity
- 245 employees
- Founded 2015
10
hVIVO· London, England, United Kingdom
hVIVO plc (Ticker: HVO) is a science‐led early‐phase drug development company purpose‐built to meet the growing complexity of modern clinical research. The Company operates an integrated early‐phase ecosystem that combines specialist clinical sites, advanced virology and immunology laboratories, human challenge expertise, and early drug development consulting. This unified model enables sponsors to generate rigorous, decision‐ready human data earlier in development, reducing uncertainty and accelerating progression through Phase I and II trials.With industry‐leading capabilities in respiratory and infectious disease, alongside expanding expertise in cardiometabolic and other high‐growth therapeutic areas, hVIVO supports a diverse global client base that includes seven of the world’s ten largest biopharmaceutical companies. Its London quarantine facilities are the largest purpose‐built human challenge units in the world, complemented by additional early‐phase clinical capacity in Germany and a specialist consulting team providing strategic, regulatory, and biometry expertise.The Company’s integrated approach delivers a seamless pathway from preclinical planning through early proof‐of‐concept, supported by continuous patient recruitment through FluCamp and a network of outpatient clinical sites for Phase II and III studies. By unifying scientific insight, operational control, and advanced laboratory capabilities, hVIVO provides sponsors with the clarity, speed, and reliability required to advance new medicines with confidence.
- Series B
- 236 employees
- Founded 1989

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Find engineers at Biotech companies in London

London has long been a hub for Biotech, and the list above ranks the largest Biotech companies headquartered there by current headcount, drawn from public LinkedIn and Crunchbase records. With 244 matching companies in Refolk’s index, this is a good map of where the Biotech talent in London lives - useful whether you’re recruiting, partnering, or sizing a market.

The biggest Biotech 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 Biotech 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 18:00:37 GMT

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