# Pharmaceutical companies headquartered in London

Tamtam tracks 41 pharmaceutical companies headquartered in London. This list ranks the 30 largest by number of employees on LinkedIn, led by GSK, Haleon and Hikma Pharmaceuticals. Their median headcount is 613. Half of them were founded in 2008 or later.

The pharmaceutical sector in London features a mix of large, established companies and mid-sized firms. GSK focuses on advancing healthcare through science and technology, while Haleon improves everyday health with a human-centered approach. Hikma Pharmaceuticals manufactures and supplies a wide range of generic and specialty products globally, and Convatec delivers pioneering medical solutions. LivaNova specializes in advanced medical technologies, and LGC provides mission-critical components in life sciences.

A notable characteristic of these companies is their global reach, with many, like Accord Healthcare, distributing medicines across numerous countries. The sector also includes specialized firms such as ViiV Healthcare, dedicated to HIV research and access to care, and Autolus Therapeutics, which develops T cell therapies for cancer treatment. This highlights a diverse ecosystem within London's pharmaceutical landscape.

🇬🇧 London · 30 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [GSK](https://www.tamtam.ai/c/gsk) (gsk.com)<br>Uniting science, technology, and talent to advance healthcare and disease prevention through collaborative innovation and community engagement. | Pharmaceutical Manufacturing | 🇬🇧 London | 92,092 |  |
| 2 | [Haleon](https://www.tamtam.ai/c/haleon) (haleon.com)<br>The company is focused on improving everyday health through a human-centered approach They promote community guidelines for social media interactions #HelloHaleon | Consumer Services | 🇬🇧 London | 18,581 | 2022 |
| 3 | [Hikma Pharmaceuticals](https://www.tamtam.ai/c/hikma-pharmaceuticals) (hikma.com)<br>Manufacturing and supplying over 800 generic, specialty, and branded pharmaceutical products to hospitals, physicians, and pharmacists globally. | Pharmaceutical Manufacturing | 🇬🇧 London | 10,626 | 1978 |
| 4 | [Convatec](https://www.tamtam.ai/c/convatec) (convatecgroup.com)<br>Delivering pioneering and trusted medical solutions focused on improving the lives of patients and healthcare providers worldwide. | Medical Equipment Manufacturing | 🇬🇧 London | 6,954 | 1978 |
| 5 | [LivaNova](https://www.tamtam.ai/c/livanova) (livanova.com)<br>Global medical technology company with advanced technologies and breakthrough treatments focused on improving patient lives worldwide in cardiopulmonary and neuromodulation | Medical Equipment Manufacturing | 🇬🇧 London | 3,545 |  |
| 6 | [LGC](https://www.tamtam.ai/c/lgc) (lgcgroup.com)<br>Global life science tools company providing mission-critical components and solutions in human healthcare and applied markets, with a focus on genomic analysis and quality assurance applications | Biotechnology Research | 🇬🇧 London | 2,500 |  |
| 7 | [Accord Healthcare](https://www.tamtam.ai/c/accord-healthcare) (accord-healthcare.com)<br>Development, manufacturing, and distribution of affordable medicines across over 85 countries, focusing on patient access and healthcare improvement. | Pharmaceutical Manufacturing | 🇬🇧 London | 2,038 |  |
| 8 | [ViiV Healthcare](https://www.tamtam.ai/c/viiv-healthcare) (viivhealthcare.com)<br>A global HIV specialist company focused on researching new medicines and improving access to care for people living with HIV | Pharmaceutical Manufacturing | 🇬🇧 London | 1,960 | 2009 |
| 9 | [NextPharma](https://www.tamtam.ai/c/nextpharma) (nextpharma.com)<br>NextPharma is a leading European CDMO partner offering fast, flexible, and personalized solutions for pharmaceutical development and manufacturing in various industries | Pharmaceutical Manufacturing | 🇬🇧 London | 977 | 1946 |
| 10 | [APCER Life Sciences](https://www.tamtam.ai/c/apcer-life-sciences) (apcerls.com)<br>Global provider of drug safety, pharmacovigilance, regulatory services, and risk management programs for pharmaceutical companies worldwide, with expertise in medical writing and quality assurance | Business Consulting and Services | 🇬🇧 London | 943 | 2007 |
| 11 | [Qinecsa Solutions](https://www.tamtam.ai/c/qinecsa-solutions) (qinecsa.com)<br>A global life science partner offering industry-leading pharmacovigilance technology and expert scientific solutions to efficiently manage drug safety data | Pharmaceutical Manufacturing | 🇬🇧 London | 936 | 2006 |
| 12 | [Autolus Therapeutics](https://www.tamtam.ai/c/autolus-therapeutics) (autolus.com)<br>Clinical-stage biopharmaceutical company developing next-generation T cell therapies for cancer treatment by engineering targeted and active therapies to eliminate cancer cells | Biotechnology Research | 🇬🇧 London | 755 | 2014 |
| 13 | [ADVANZ PHARMA](https://www.tamtam.ai/c/advanz-pharma) (advanzpharma.com)<br>Global pharmaceutical company providing specialty, hospital, and rare disease medicines through partnerships and direct commercial presence worldwide. | Pharmaceutical Manufacturing | 🇬🇧 London | 734 |  |
| 14 | [Clinigen](https://www.tamtam.ai/c/clinigen) (clinigengroup.com)<br>specialist pharmaceutical services and products platform providing ethical access to medicines, supporting drug development and patient access worldwide | Professional Services | 🇬🇧 London | 633 | 2010 |
| 15 | [Sinclair](https://www.tamtam.ai/c/sinclair) (sinclair.com)<br>global medical aesthetics company providing innovative products and tools to empower clinicians, supporting practice growth and holistic patient care worldwide | Pharmaceutical Manufacturing | 🇬🇧 London | 613 | 1971 |
| 16 | [Veramed](https://www.tamtam.ai/c/veramed) (veramed.co.uk)<br>A customer-focused Clinical Research Organisation offering high-quality biostatistics and programming services for the pharmaceutical industry, with a focus on innovation and service excellence | Research Services | 🇬🇧 London | 609 | 2012 |
| 17 | [Anthony Nolan](https://www.tamtam.ai/c/anthony-nolan) (anthonynolan.org)<br>A non-profit organization connecting donors with blood cancer patients in need of lifesaving stem cell transplants Join the register online to help save lives | Non-profit Organizations | 🇬🇧 London | 564 | 1974 |
| 18 | [Theramex](https://www.tamtam.ai/c/theramex) (theramex.com)<br>A global women's healthcare company offering innovative solutions for women's health at every stage of life through a diverse product portfolio | Pharmaceutical Manufacturing | 🇬🇧 London | 476 | 2018 |
| 19 | [MSD in the UK](https://www.tamtam.ai/c/msd-in-the-uk) (msd-uk.com)<br>A leading biopharmaceutical company focused on developing innovative medicines and vaccines to save and improve lives globally through cutting-edge research | Pharmaceutical Manufacturing | 🇬🇧 London | 402 | 1891 |
| 20 | [Vision RT Ltd](https://www.tamtam.ai/c/vision-rt-ltd) (visionrt.com)<br>Develops AI-driven surface guided radiation therapy technology to enhance accuracy, safety, efficiency, and patient comfort during cancer radiotherapy treatments. | Medical Equipment Manufacturing | 🇬🇧 London | 391 | 2001 |
| 21 | [Isomorphic Labs](https://www.tamtam.ai/c/isomorphic-labs) (isomorphiclabs.com)<br>Innovative biotech company using AI to revolutionize drug discovery and understand fundamental mechanisms of life for increased research efficacy and breakthroughs | Biotechnology Research | 🇬🇧 London | 381 | 2021 |
| 22 | [Phastar](https://www.tamtam.ai/c/phastar) (phastar.com)<br>Specialist biometrics CRO offering statistical consulting, clinical trial reporting, data management, and data science services globally with a focus on quality and efficiency | Biotechnology Research | 🇬🇧 London | 366 | 2007 |
| 23 | [WEP Clinical](https://www.tamtam.ai/c/wep-clinical) (wepclinical.com)<br>A market-leading healthcare services company that creates treatment access solutions for patients worldwide through various programs and services | Research Services | 🇬🇧 London | 356 | 2008 |
| 24 | [CORCYM](https://www.tamtam.ai/c/corcym) (corcym.com)<br>A company dedicated to heart surgeons and patients, providing leading solutions to combat structural heart disease | Medical Equipment Manufacturing | 🇬🇧 London | 350 | 2021 |
| 25 | [Novartis UK](https://www.tamtam.ai/c/novartis-uk) (novartis.com)<br>Discovery and development of breakthrough treatments using science and technology to treat serious diseases including cancer and multiple sclerosis for UK patients. | Pharmaceutical Manufacturing | 🇬🇧 London | 329 | 1996 |
| 26 | [LumiraDx](https://www.tamtam.ai/c/lumiradx) (lumiradx.com)<br>A next-generation point of care diagnostics company manufacturing an innovative platform for lab-quality testing at the point of care, including COVID-19 solutions | Hospitals and Health Care | 🇬🇧 London | 324 | 2014 |
| 27 | [Bristol Myers Squibb UK & Ireland](https://www.tamtam.ai/c/bristol-myers-squibb-uk-and-ireland) (bms.com)<br>A global biopharmaceutical company focused on developing advanced medications for life-threatening illnesses, fostering innovation, and promoting health equity worldwide | Pharmaceutical Manufacturing | 🇬🇧 London | 323 |  |
| 28 | [Randox Health](https://www.tamtam.ai/c/randox-health) (randoxhealth.com)<br>Providing advanced health testing services including in-clinic and home kits, corporate wellbeing, and extensive diagnostic pathology support. | Wellness and Fitness Services | 🇬🇧 London | 218 | 2010 |
| 29 | [Quell Therapeutics](https://www.tamtam.ai/c/quell-therapeutics) (quell-tx.com)<br>A dynamic biotech company dedicated to advancing cell therapy for solid organ transplantation and auto-immune conditions, with a focus on patient-centric innovation and collaboration | Biotechnology Research | 🇬🇧 London | 116 | 2019 |
| 30 | [NOVUMGEN](https://www.tamtam.ai/c/novumgen) (novumgen.com)<br>A pharmaceutical company focused on developing innovative, high-quality medicines, expanding globally, overcoming challenges, and committed to research, quality, and patient safety | Pharmaceutical Manufacturing | 🇬🇧 London | 112 |  |

## 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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- [Multinational companies in London](https://www.tamtam.ai/l/multinational-companies-london) (3,652)
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## The same list elsewhere in United Kingdom

- [Pharmaceutical companies in the United Kingdom](https://www.tamtam.ai/l/pharmaceutical-companies-united-kingdom) (235)
- [Pharmaceutical companies in England](https://www.tamtam.ai/l/pharmaceutical-companies-england) (198)

## The same list elsewhere

- [Pharmaceutical companies in the world](https://www.tamtam.ai/l/pharmaceutical-companies-in-the-world) (5,664)
- [Pharmaceutical companies in Europe](https://www.tamtam.ai/l/pharmaceutical-companies-in-europe) (3,019)

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Source: https://www.tamtam.ai/l/pharmaceutical-companies-london