Company lists · Data refreshed September 2026
Top 25 Patient recruitment clinical research companies based in the United Kingdom
RevenueBase identified 174 patient recruitment clinical research companies headquartered in the United Kingdom as of September 2026 and tracks 7,182 professional contacts across them, including 2,624 with verified work emails. London is the largest hub.
This list covers patient recruitment clinical research 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 29, 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.
The 25 largest patient recruitment clinical research companies based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 1,197 contacts → | ||||
Strong 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 29, 2026Thanks. The Data Team will review it. | |||||
| 2 | 452 contacts → | ||||
Indirect evidence “Calyx and Invicro are now Perceptive!” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 3 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 4 | 321 contacts → | ||||
Partial 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 29, 2026Thanks. The Data Team will review it. | |||||
| 5 | 312 contacts → | ||||
Partial evidence “Our passion for improving patients’ lives motivates us to apply our skills, experience, and knowledge to advance medicine.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 6 | 282 contacts → | ||||
Strong evidence “FutureMeds is an independent, fully-owned European Site Network and DCT service provider dedicated to running patient-centric clinical trials and delivering quality data for the…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 7 | 214 contacts → | ||||
Strong 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 29, 2026Thanks. The Data Team will review it. | |||||
| 8 | 208 contacts → | ||||
Strong 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 29, 2026Thanks. The Data Team will review it. | |||||
| 9 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 10 | 139 contacts → | ||||
Strong evidence “We’re on a mission to make life better for patients taking part in clinical trials around the world-and for the caregivers who support them.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 11 | 136 contacts → | ||||
Partial 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 29, 2026Thanks. The Data Team will review it. | |||||
| 12 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 13 | 97 contacts → | ||||
Partial evidence “The Medicines Evaluation Unit (MEU) Ltd, an IQVIA business, is one of the UK’s leading contract research organisations, a facility where commitment to excellence is paramount.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 14 | 95 contacts → | ||||
Strong evidence “Innovative Trials was built around a simple belief, patient recruitment works better when people feel supported.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 15 | 56 contacts → | ||||
Strong evidence “GRC Health specialises in patient-centred research for all stages of product development and marketing.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 16 | 51 contacts → | ||||
Strong evidence “We are the original patient communications agency specialising in clinical trial engagement and healthcare communications for patients and HCPs.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 17 | 46 contacts → | ||||
Partial evidence “Our expertise supports clinical trials in over 150 countries worldwide.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 18 | 43 contacts → | ||||
Strong evidence “Medicys is a leading provider of healthcare fieldwork solutions, specialising in recruiting patients and healthcare professionals (HCPs) for Health Economics and Outcomes Research…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 19 | 42 contacts → | ||||
Strong evidence “ARC's purpose is to expedite access to precision medicine clinical trials for patients globally.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 20 | 39 contacts → | ||||
Indirect evidence “Described as "A centre of excellence" by the MHRA - ESMS Global LTD, formerly part of the Guy’s Poisons Unit, is a niche service provider based in central London.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 21 | 39 contacts → | ||||
Strong evidence “Niche Science & Technology Ltd has provided a comprehensive clinical research service to a growing number of pharmaceutical clients since its inception in 1998.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 22 | 37 contacts → | ||||
Strong evidence “Sylphid Analytics is a specialized Clinical Research Organization (CRO) delivering high-quality, end-to-end support to the Pharmaceutical and Biopharmaceutical industries.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 23 | 36 contacts → | ||||
Partial evidence “Founded in 2019, Apsida Life Science is a specialist recruitment business Headquartered in Surrey, with offices in London UK, Boston USA and Pretoria, SA.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 24 | 35 contacts → | ||||
Partial evidence “End-to-end CRO services Strategic consultation for all aspects of your trial Customizing an optimal trial design Fit-for-purpose data End-to-end patient focused services Quick…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 25 | 33 contacts → | ||||
Partial evidence “GKA is a specialist medical market research fieldwork agency based in the UK.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
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: patient recruitment clinical research 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 patient recruitment clinical research companies.
- Partial evidence
- Its own public description names part of patient recruitment clinical research companies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name patient recruitment clinical research 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 174 patient recruitment clinical research companies based in the United Kingdom
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Patient recruitment clinical research companies based in the United Kingdom at a glance
As of Sep 29, 2026Companies by employee count
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 174 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 patient recruitment clinical research 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 “patient recruitment clinical research 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 patient recruitment clinical research 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 patient recruitment clinical research 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, 2,624 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 29, 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.
Patient recruitment clinical research companies by metro
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 patient recruitment clinical research 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 patient recruitment clinical research companies are there based in the United Kingdom?
RevenueBase identified 174 patient recruitment clinical research 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?
Perceptive INC, headquartered in London, tops this list with the largest team on record.
Which city has the most patient recruitment clinical research companies?
London leads with 41 headquartered companies, followed by Manchester (9) and Glasgow (8).
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 2,624 verified decision-maker contacts tracked across these 174 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 29, 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.
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