Company lists · Data refreshed September 2026

Top 25 Contract research organizations based in the United Kingdom

Name: Contract research organizations based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 636 companies tracked

RevenueBase identified 636 contract research organizations headquartered in the United Kingdom as of September 2026 and tracks 22,745 professional contacts across them, including 11,872 with verified work emails. London is the largest hub.

This list covers contract research organizations 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 19, 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 19, 2026 86% judged on-target in blind review

636Companies

22,745Contacts tracked

11,872Verified emails

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The 25 largest contract research organizations based in the United Kingdom

Ranked by team size

Top 25 of 636 contract research organizations based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to contract research organizations: 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	Almac Group	Indirect evidence	Craigavon, United KingdomHQ checked Sep 19, 2026	5,001-10,000	4,577 contacts →
	Indirect evidence “Partnering to Advance Human Health A unique culture delivering exceptional solutions: Almac is a financially secure, privately owned organisation with 7,800+ employees globally.” Source: RevenueBase Database · checked Sep 19, 2026
2	Perceptive INC	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	1,001-5,000	1,197 contacts →
	Partial evidence “Expanding on their combined 50-year history, Perceptive provides best-in-class specialist support to global pharmaceutical, biotech, and clinical research organizations, spanning…” Source: RevenueBase Database · checked Sep 19, 2026
3	Apcer Life Sciences	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	501-1,000	1,079 contacts →
	Indirect evidence “APCER Life Sciences, established in 2007, is a trusted global leader in pharmacovigilance, medical information, medical writing, and regulatory affairs.” Source: RevenueBase Database · checked Sep 19, 2026
4	Envision Pharma Group	Indirect evidence	Wilmslow, United KingdomHQ checked Sep 19, 2026	1,001-5,000	933 contacts →
	Indirect evidence “Founded in 2001, Envision Pharma Group is a leading global technology-enabled strategic solutions partner for the life sciences industry, working with over 200 pharma and biotech…” Source: RevenueBase Database · checked Sep 19, 2026
5	Sygnature Discovery	Indirect evidence	Nottingham, United KingdomHQ checked Sep 19, 2026	501-1,000	582 contacts →
	Indirect evidence “At Sygnature Discovery, a global drug discovery CRO, we create exceptional scientific outcomes.” Source: RevenueBase Database · checked Sep 19, 2026
6	O2h Discovery	Strong evidence	Cambridge, United KingdomHQ checked Sep 19, 2026	501-1,000	521 contacts →
	Strong evidence “Founded in 2005, o2h discovery is a Contract Research Organisation which has an integrated drug discovery platform operating from our state-of-the-art research centre in India and…” Source: RevenueBase Database · checked Sep 19, 2026
7	CALYX	Indirect evidence	Nottingham, United KingdomHQ checked Sep 19, 2026	1,001-5,000	452 contacts →
	Indirect evidence “Calyx and Invicro are now Perceptive!” Source: RevenueBase Database · checked Sep 19, 2026
8	Veramed	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	501-1,000	438 contacts →
	Partial evidence “Veramed is a Clinical Research Organization (CRO) that provides expert data management, biostatistics and programming services to the pharmaceutical and biotech industry.” Source: RevenueBase Database · checked Sep 19, 2026
9	Phastar	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	501-1,000	387 contacts →
	Indirect evidence “Phastar is an award-winning specialist biometrics and data science CRO, trusted by pharma, biotech, and medical device companies worldwide.” Source: RevenueBase Database · checked Sep 19, 2026
10	MAC Clinical Research	Strong evidence	Blackpool, United KingdomHQ checked Sep 19, 2026	201-500	333 contacts →
	Strong evidence “MAC Clinical Research is a leading full-service, global Contract Research Organisation (CRO) with over 30 years of experience in clinical trial management.” Source: RevenueBase Database · checked Sep 19, 2026
11	WEP Clinical	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	201-500	321 contacts →
	Indirect evidence “At WEP Clinical, we operate as a specialist CRO with a proven track record of excellence in designing, managing, and executing Clinical Trials, Expanded Access Programs (EAPs)…” Source: RevenueBase Database · checked Sep 19, 2026
12	Simbec-Orion	Indirect evidence	Merthyr Tydfil, United KingdomHQ checked Sep 19, 2026	201-500	312 contacts →
	Indirect evidence “Our passion for improving patients’ lives motivates us to apply our skills, experience, and knowledge to advance medicine.” Source: RevenueBase Database · checked Sep 19, 2026
13	Hammersmith Medicines Research LTD	Strong evidence	London, United KingdomHQ checked Sep 19, 2026	201-500	230 contacts →
	Strong evidence “HMR is a Contract Research Organisation (CRO).” Source: RevenueBase Database · checked Sep 19, 2026
14	HVIVO	Partial evidence	London, United KingdomHQ checked Sep 19, 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 19, 2026
15	Concept Life Sciences	Strong evidence	High Peak, United KingdomHQ checked Sep 19, 2026	201-500	209 contacts →
	Strong evidence “Concept Life Sciences is a knowledge-based, science-led and customer-focused contract research and manufacturing organisation with world-leading expertise in the pharmaceutical…” Source: RevenueBase Database · checked Sep 19, 2026
16	Illingworth Research Group A Syneos Health Company	Partial evidence	Macclesfield, United KingdomHQ checked Sep 19, 2026	51-200	208 contacts →
	Partial evidence “Illingworth Research Group™, a Syneos Health® company, is a leading provider of clinical research home health services, providing highly trained, qualified and experienced…” Source: RevenueBase Database · checked Sep 19, 2026
17	Richmond Pharmacology	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	198 contacts →
	Indirect evidence “At Richmond, we're on a mission to transform healthcare by delivering faster answers and turning hope into tangible solutions.” Source: RevenueBase Database · checked Sep 19, 2026
18	Quanticate	Partial evidence	Hitchin, United KingdomHQ checked Sep 19, 2026	201-500	192 contacts →
	Partial evidence “Quanticate is a leading global data focused clinical research organisation (CRO) primarily focused on the management, analysis and reporting of data from clinical trials and…” Source: RevenueBase Database · checked Sep 19, 2026
19	Synexa Life Sciences	Indirect evidence	Manchester, United KingdomHQ checked Sep 19, 2026	201-500	166 contacts →
	Indirect evidence “Synexa Life Sciences is a biomarker and bioanalytical lab CRO, specialising in the development, validation, and delivery of a wide range of complex and custom-designed assays.” Source: RevenueBase Database · checked Sep 19, 2026
20	Star People	Indirect evidence	Rugby, United KingdomHQ checked Sep 19, 2026	501-1,000	160 contacts →
	Indirect evidence “Part of Uniphar, we are the strategic recruitment and outsourced partner for pharma, medtech, and biotech companies looking to maximise their commercial success through tailored…” Source: RevenueBase Database · checked Sep 19, 2026
21	CHASE	Indirect evidence	Edinburgh, United KingdomHQ checked Sep 19, 2026	201-500	155 contacts →
	Indirect evidence “We are a leading provider of outsourced commercial, medical and recruitment services to pharmaceutical, biotech and healthcare companies.” Source: RevenueBase Database · checked Sep 19, 2026
22	Vigilare	Indirect evidence	Ruislip, United KingdomHQ checked Sep 19, 2026	51-200	150 contacts →
	Indirect evidence “We are Vigilare BioPharma, a global Regulatory partner for Pharmaceuticals, Generics, Consumer Healthcare Products and Medical Devices.” Source: RevenueBase Database · checked Sep 19, 2026
23	Clintec	Strong evidence	Glasgow, United KingdomHQ checked Sep 19, 2026	501-1,000	136 contacts →
	Strong evidence “Clintec, an IQVIA company, is an innovative, medium-sized, global Contract Research Organization providing global full and functional service support to the pharmaceutical…” Source: RevenueBase Database · checked Sep 19, 2026
24	Panthera Biopartners	Strong evidence	Preston, United KingdomHQ checked Sep 19, 2026	11-50	127 contacts →
	Strong evidence “Panthera is an independent SMO working with pharmaceutical and contract research organizations to find the right patient, for the right trial, at the right time through the…” Source: RevenueBase Database · checked Sep 19, 2026
25	Lifescience Dynamics Limited	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	127 contacts →
	Indirect evidence “Winner of the prestigious King's Award for Enterprise 2023, Queen's Award for Enterprise 2016 and ranking in Vault.com’s 25 Best Consulting Companies to work for - Lifescience…” Source: RevenueBase Database · checked Sep 19, 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: contract research organizations. 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 contract research organizations.
Partial evidence: Its own public description names part of contract research organizations, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name contract research organizations. 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 636 contract research organizations based in the United Kingdom

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Contract research organizations based in the United Kingdom at a glance

As of Sep 19, 2026

52.2%Verified-email coverage

35.8Average contacts per company

1-10Median size (employees)

29.7%Largest-city concentration · London

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

344

11-50

178

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

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 636 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 contract research organizations, 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 “contract research organizations”. 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 contract research organizations), 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 contract research organizations, 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, 11,872 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 19, 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.

Contract research organizations by metro

Contract research organizations in London189
Contract research organizations in Cambridge28

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 contract research organizations, 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 contract research organizations are there based in the United Kingdom?

RevenueBase identified 636 contract research organizations 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?

Almac Group, headquartered in Craigavon, tops this list with the largest team on record.

Which city has the most contract research organizations?

London leads with 189 headquartered companies, followed by Cambridge (28) and Manchester (23).

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 11,872 verified decision-maker contacts tracked across these 636 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 19, 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.