Company lists · Data refreshed September 2026

Top 25 Clinical-stage biopharmaceutical companies based in the United Kingdom

Name: Clinical-stage biopharmaceutical companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 76 companies tracked

RevenueBase identified 76 clinical-stage biopharmaceutical companies headquartered in the United Kingdom as of September 2026 and tracks 3,131 professional contacts across them, including 857 with verified work emails. London is the largest hub.

This list covers clinical-stage biopharmaceutical companies headquartered in the United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 16, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 16, 2026 86% judged on-target in blind review

76Companies

3,131Contacts tracked

857Verified emails

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The 25 largest clinical-stage biopharmaceutical companies based in the United Kingdom

Ranked by team size

Top 25 of 76 clinical-stage biopharmaceutical companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to clinical-stage biopharmaceutical companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Bicycle Therapeutics	Strong evidence	Cambridge, United KingdomHQ checked Sep 16, 2026	201-500	342 contacts →
	Strong evidence “Bicycle Therapeutics (NASDAQ: BCYC) is a clinical-stage biopharmaceutical company that is harnessing the power of bicyclic peptides and leveraging Nobel Prize-winning science to…” Source: RevenueBase Database · checked Sep 16, 2026
2	Bristol Myers Squibb UK & Ireland	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	1,001-5,000	317 contacts →
	Indirect evidence “Bristol Myers Squibb is a differentiated company, led by our revolutionary BioPharma strategy that combines the reach and resources of a major pharmaceutical firm with the…” Source: RevenueBase Database · checked Sep 16, 2026
3	HVIVO	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	214 contacts →
	Partial evidence “hVIVO plc (Ticker: HVO) is a science‑led early‑phase drug development company purpose‑built to meet the growing complexity of modern clinical research.” Source: RevenueBase Database · checked Sep 16, 2026
4	Arcinova	Indirect evidence	Alnwick, United KingdomHQ checked Sep 16, 2026	51-200	102 contacts →
	Indirect evidence “Arcinova, A Quotient Sciences Company, is dedicated to providing innovative contract research, development, and manufacturing services.” Source: RevenueBase Database · checked Sep 16, 2026
5	Barinthus Biotherapeutics	Strong evidence	Harwell, United KingdomHQ checked Sep 16, 2026	51-200	73 contacts →
	Strong evidence “Barinthus Biotherapeutics is a clinical-stage biopharmaceutical company developing novel T cell immunotherapeutic candidates designed to guide the immune system to overcome…” Source: RevenueBase Database · checked Sep 16, 2026
6	TMC Pharma Services LTD	Indirect evidence	Hartley Wintney, United KingdomHQ checked Sep 16, 2026	501-1,000	63 contacts →
	Indirect evidence “TMC is a global pharma services company, partnering with small to mid-sized biotech and pharma companies to accelerate drug development timelines and maximise value across the…” Source: RevenueBase Database · checked Sep 16, 2026
7	Oxford Biotherapeutics	Strong evidence	Oxford, United KingdomHQ checked Sep 16, 2026	11-50	60 contacts →
	Strong evidence “Oxford BioTherapeutics (OBT) is a clinical stage oncology company based in Oxford, UK; San Jose, CA and Morristown, NJ, USA, with a pipeline of first-in-class immuno-oncology (IO)…” Source: RevenueBase Database · checked Sep 16, 2026
8	Protas	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	57 contacts →
	Partial evidence “Protas is transforming clinical trials for the benefit of patients worldwide.” Source: RevenueBase Database · checked Sep 16, 2026
9	Scancell	Strong evidence	Oxford, United KingdomHQ checked Sep 16, 2026	51-200	52 contacts →
	Strong evidence “Scancell is a clinical stage immunotherapy biotech company developing treatments for significant unmet needs in cancer.” Source: RevenueBase Database · checked Sep 16, 2026
10	BDD	Partial evidence	84 Castle Street, United KingdomHQ checked Sep 16, 2026	51-200	46 contacts →
	Partial evidence “BDD combines drug delivery expertise and clinical capabilities to accelerate product development pipelines, enable life cycle management and create new value-added products.” Source: RevenueBase Database · checked Sep 16, 2026
11	Ellipses Pharma	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	40 contacts →
	Partial evidence “Ellipses Pharma is an international drug development company, focused exclusively on the advancement of innovative cancer treatments through the clinic.” Source: RevenueBase Database · checked Sep 16, 2026
12	Curve Therapeutics	Indirect evidence	Southampton, United KingdomHQ checked Sep 16, 2026	11-50	40 contacts →
	Indirect evidence “Our mission is to transform the discovery of first-in-class small molecule therapeutics by broadening the landscape of disease targets that can be drugged.” Source: RevenueBase Database · checked Sep 16, 2026
13	Mereo Biopharma	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	40 contacts →
	Partial evidence “Welcome to Mereo BioPharma, we are an agile biopharmaceutical company, focused on finding and bringing to market therapies that will improve the lives of people living with a rare…” Source: RevenueBase Database · checked Sep 16, 2026
14	Weatherden	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	29 contacts →
	Partial evidence “Weatherden is a global clinical development consultancy helping biotech and pharma realize the full potential of their science and investment.” Source: RevenueBase Database · checked Sep 16, 2026
15	TRN	Indirect evidence	Sandwich, United KingdomHQ checked Sep 16, 2026	11-50	22 contacts →
	Indirect evidence “Drug discovery and development requires in-depth multi-disciplinary expertise which organisations may not always have in-house.” Source: RevenueBase Database · checked Sep 16, 2026
16	Biodexa Pharmaceuticals PLC	Strong evidence	Cardiff, United KingdomHQ checked Sep 16, 2026	11-50	21 contacts →
	Strong evidence “Biodexa Pharmaceuticals PLC (listed on NASDAQ: BDRX) is a clinical stage biopharmaceutical company developing innovative products focused on the treatment or prevention of…” Source: RevenueBase Database · checked Sep 16, 2026
17	Impatient Health	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	20 contacts →
	Indirect evidence “We exist to accelerate the evolution towards new health future(s).” Source: RevenueBase Database · checked Sep 16, 2026
18	Cumulus Oncology	Partial evidence	Edinburgh, United KingdomHQ checked Sep 16, 2026	1-10	16 contacts →
	Partial evidence “Cumulus Oncology is developing anti-cancer therapies for clinical settings in areas of high unmet need, with the aim of developing improved outcomes for cancer patients.” Source: RevenueBase Database · checked Sep 16, 2026
19	Avillion Life Sciences	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	15 contacts →
	Partial evidence “A drug development company with an innovative model for Clinical Development.” Source: RevenueBase Database · checked Sep 16, 2026
20	Poolbeg Pharma PLC	Strong evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	13 contacts →
	Strong evidence “Poolbeg Pharma plc (AIM: POLB) is a clinical-stage biopharmaceutical company with a core focus on transforming the cancer immunotherapy field.” Source: RevenueBase Database · checked Sep 16, 2026
21	Silicon Pharma	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	11 contacts →
	Indirect evidence “Founded in 2010 and headquartered in London, United Kingdom, Silicon Pharma Ltd is a trusted name in the pharmaceutical industry.” Source: RevenueBase Database · checked Sep 16, 2026
22	Treos BIO	Strong evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	11 contacts →
	Strong evidence “Treos Bio is a clinical stage company introducing a disruptive computational technology to change the paradigm of cancer immunotherapy development by resolving the dual challenges…” Source: RevenueBase Database · checked Sep 16, 2026
23	Aptorum Group Limited Nasdaq APM	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	10 contacts →
	Indirect evidence “At Aptorum, we believe that by facilitating the development of medical innovations, particularly in those that able to meet current unmet medical needs and significantly improve…” Source: RevenueBase Database · checked Sep 16, 2026
24	Vasodynamics LTD	Strong evidence	Stevenage, United KingdomHQ checked Sep 16, 2026	1-10	10 contacts →
	Strong evidence “Vaso Dynamics is a clinical stage biotech and pharmaceutical development company based in Stevenage and London, UK, focusing on developing innovative pharmaceutical products for…” Source: RevenueBase Database · checked Sep 16, 2026
25	Acceler8 Clinical Research	Strong evidence	Cheshire, United KingdomHQ checked Sep 16, 2026	11-50	7 contacts →
	Strong evidence “Acceler8 Clinical Research is a global provider of biopharmaceutical services.” Source: RevenueBase Database · checked Sep 16, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: clinical-stage biopharmaceutical companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names clinical-stage biopharmaceutical companies.
Partial evidence: Its own public description names part of clinical-stage biopharmaceutical companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name clinical-stage biopharmaceutical companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 76 clinical-stage biopharmaceutical companies based in the United Kingdom

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Clinical-stage biopharmaceutical companies based in the United Kingdom at a glance

As of Sep 16, 2026

27.4%Verified-email coverage

41.2Average contacts per company

11-50Median size (employees)

40.8%Largest-city concentration · London

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 76 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among clinical-stage biopharmaceutical companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United Kingdom whose own description of what they do matches “clinical-stage biopharmaceutical companies”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names clinical-stage biopharmaceutical companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among clinical-stage biopharmaceutical companies, and records with no verified work email. Companies headquartered outside United Kingdom are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 857 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 16, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Clinical-stage biopharmaceutical companies by metro

Clinical-stage biopharmaceutical companies in London31

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names clinical-stage biopharmaceutical companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many clinical-stage biopharmaceutical companies are there based in the United Kingdom?

RevenueBase identified 76 clinical-stage biopharmaceutical companies headquartered in the United Kingdom as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Bicycle Therapeutics, headquartered in Cambridge, tops this list with the largest team on record.

Which city has the most clinical-stage biopharmaceutical companies?

London leads with 31 headquartered companies, followed by Cambridge (4) and Oxford (4).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 857 verified decision-maker contacts tracked across these 76 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 16, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.