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.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 | 92,092 | ||||
| 2 |
Haleonhaleon.com
The company is focused on improving everyday health through a human-centered approach They promote community guidelines for social media interactions #HelloHaleon |
18,581 | |||
| 3 |
Hikma Pharmaceuticalshikma.com
Manufacturing and supplying over 800 generic, specialty, and branded pharmaceutical products to hospitals, physicians, and pharmacists globally. |
10,626 | |||
| 4 |
Convatecconvatecgroup.com
Delivering pioneering and trusted medical solutions focused on improving the lives of patients and healthcare providers worldwide. |
6,954 | |||
| 5 |
LivaNovalivanova.com
Global medical technology company with advanced technologies and breakthrough treatments focused on improving patient lives worldwide in cardiopulmonary and neuromodulation |
3,545 | |||
| 6 |
LGClgcgroup.com
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 |
2,500 | |||
| 7 |
Accord Healthcareaccord-healthcare.com
Development, manufacturing, and distribution of affordable medicines across over 85 countries, focusing on patient access and healthcare improvement. |
2,038 | |||
| 8 |
ViiV Healthcareviivhealthcare.com
A global HIV specialist company focused on researching new medicines and improving access to care for people living with HIV |
1,960 | |||
| 9 |
NextPharmanextpharma.com
NextPharma is a leading European CDMO partner offering fast, flexible, and personalized solutions for pharmaceutical development and manufacturing in various industries |
977 | |||
| 10 |
APCER Life Sciencesapcerls.com
Global provider of drug safety, pharmacovigilance, regulatory services, and risk management programs for pharmaceutical companies worldwide, with expertise in medical writing and quality assurance |
943 | |||
| 11 |
Qinecsa Solutionsqinecsa.com
A global life science partner offering industry-leading pharmacovigilance technology and expert scientific solutions to efficiently manage drug safety data |
936 | |||
| 12 |
Autolus Therapeuticsautolus.com
Clinical-stage biopharmaceutical company developing next-generation T cell therapies for cancer treatment by engineering targeted and active therapies to eliminate cancer cells |
755 | |||
| 13 |
ADVANZ PHARMAadvanzpharma.com
Global pharmaceutical company providing specialty, hospital, and rare disease medicines through partnerships and direct commercial presence worldwide. |
734 | |||
| 14 |
Clinigenclinigengroup.com
specialist pharmaceutical services and products platform providing ethical access to medicines, supporting drug development and patient access worldwide |
633 | |||
| 15 |
Sinclairsinclair.com
global medical aesthetics company providing innovative products and tools to empower clinicians, supporting practice growth and holistic patient care worldwide |
613 | |||
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 |
Veramedveramed.co.uk
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 |
609 | |||
| 17 |
Anthony Nolananthonynolan.org
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 |
564 | |||
| 18 |
Theramextheramex.com
A global women's healthcare company offering innovative solutions for women's health at every stage of life through a diverse product portfolio |
476 | |||
| 19 |
MSD in the UKmsd-uk.com
A leading biopharmaceutical company focused on developing innovative medicines and vaccines to save and improve lives globally through cutting-edge research |
402 | |||
| 20 |
Vision RT Ltdvisionrt.com
Develops AI-driven surface guided radiation therapy technology to enhance accuracy, safety, efficiency, and patient comfort during cancer radiotherapy treatments. |
391 | |||
| 21 |
Isomorphic Labsisomorphiclabs.com
Innovative biotech company using AI to revolutionize drug discovery and understand fundamental mechanisms of life for increased research efficacy and breakthroughs |
381 | |||
| 22 |
Phastarphastar.com
Specialist biometrics CRO offering statistical consulting, clinical trial reporting, data management, and data science services globally with a focus on quality and efficiency |
366 | |||
| 23 |
WEP Clinicalwepclinical.com
A market-leading healthcare services company that creates treatment access solutions for patients worldwide through various programs and services |
356 | |||
| 24 |
CORCYMcorcym.com
A company dedicated to heart surgeons and patients, providing leading solutions to combat structural heart disease |
350 | |||
| 25 |
Novartis UKnovartis.com
Discovery and development of breakthrough treatments using science and technology to treat serious diseases including cancer and multiple sclerosis for UK patients. |
329 | |||
| 26 |
LumiraDxlumiradx.com
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 |
324 | |||
| 27 |
Bristol Myers Squibb UK & Irelandbms.com
A global biopharmaceutical company focused on developing advanced medications for life-threatening illnesses, fostering innovation, and promoting health equity worldwide |
323 | |||
| 28 |
Randox Healthrandoxhealth.com
Providing advanced health testing services including in-clinic and home kits, corporate wellbeing, and extensive diagnostic pathology support. |
218 | |||
| 29 |
Quell Therapeuticsquell-tx.com
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 |
116 | |||
| 30 |
NOVUMGENnovumgen.com
A pharmaceutical company focused on developing innovative, high-quality medicines, expanding globally, overcoming challenges, and committed to research, quality, and patient safety |
112 | |||
Turn this list into pipeline
Tamtam finds the decision-makers at every company on a list like this one, with verified emails, phone numbers and the buying signals that tell you when to reach out.
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
- The largest companies in London 12,882
- Multinational companies in London 3,652
- Financial Services companies in London 1,862
- Financial services firms in London 1,824
- SaaS companies in London 1,615
- Professional services firms in London 1,248
- Software Development companies in London 1,217
- Retail chains in London 942
- IT Services and IT Consulting companies in London 693
- Companies with a mobile app in London 667
- Consulting firms in London 648
- IT services companies in London 607
- Subscription businesses in London 544
- Venture capital and private equity firms in London 539
- Marketing and communications agencies in London 533
- Retail Apparel and Fashion companies in London 498
- Advertising Services companies in London 480
- Companies with in-house R&D in London 477
- AI companies in London 456
- Investment Management companies in London 452
- Hotel and hospitality groups in London 445
- Luxury brands in London 428
- AI-native companies in London 407
- E-commerce companies in London 384