Company lists · Data refreshed September 2026

Top 23 Clinical trial staffing based in London, United Kingdom

Name: Clinical trial staffing based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 8, 2026 64 companies tracked

RevenueBase identified 64 clinical trial staffing headquartered in London, United Kingdom as of September 2026 and tracks 2,344 professional contacts across them, including 1,294 with verified work emails and 430 with mobile numbers. London is the largest hub.

This list covers clinical trial staffing headquartered in London, 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 8, 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 8, 2026 86% judged on-target in blind review

64Companies

2,344Contacts tracked

1,294Verified emails

430Mobile numbers

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The 23 largest clinical trial staffing based in London, United Kingdom

Ranked by team size

Top 23 of 64 clinical trial staffing based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 8, 2026. RevenueBase Smart Search rates how each company's information relates to clinical trial staffing: 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	Perceptive INC	Partial evidence	London, United KingdomHQ checked Sep 8, 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 8, 2026
2	WEP Clinical	Strong evidence	London, United KingdomHQ checked Sep 8, 2026	201-500	321 contacts →
	Strong 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 8, 2026
3	Richmond Pharmacology	Indirect evidence	London, United KingdomHQ checked Sep 8, 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 8, 2026
4	Esms Global LTD	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	51-200	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 8, 2026
5	Research Organisation KC LTD	Strong evidence	London, United KingdomHQ checked Sep 8, 2026	11-50	23 contacts →
	Strong evidence “ROKC is an innovative CRO specialising in the bespoke design, management and delivery of Pan European multi-centre clinical trials to commercial, academic and non governmental…” Source: RevenueBase Database · checked Sep 8, 2026
6	X4 Life Sciences	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	51-200	20 contacts →
	Indirect evidence “X4 Life Sciences partner with businesses across the entire life sciences spectrum, from early-stage R&D to commercial enterprises to provide world-class talent solutions.” Source: RevenueBase Database · checked Sep 8, 2026
7	Paspigioni	Strong evidence	London, United KingdomHQ checked Sep 8, 2026	11-50	12 contacts →
	Strong evidence “Paspigioni is a full-service contract research organisation dedicated to excellence in clinical trials of pharmaceutical, biotech, and medical devices.” Source: RevenueBase Database · checked Sep 8, 2026
8	Gxpeople Global	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	11-50	12 contacts →
	Indirect evidence “In the ever-evolving world of PHARMACEUTICALS, BIOTECHNOLOGY, and MEDICAL DEVICES, securing exceptional QUALITY, TECHNICAL OPERATIONS and REGULATORY AFFAIRS talent is crucial for…” Source: RevenueBase Database · checked Sep 8, 2026
9	Tcr-Solutions	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	11-50	11 contacts →
	Partial evidence “Tailored Clinical Research Solutions (TCRS) is a CRO whose founders have detailed knowledge of the clinical research landscape across Europe and the US.” Source: RevenueBase Database · checked Sep 8, 2026
10	Leaman Life Sciences	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	11-50	8 contacts →
	Indirect evidence “10 Years of Precision.” Source: RevenueBase Database · checked Sep 8, 2026
11	Scienta	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	11-50	6 contacts →
	Indirect evidence “Finding the best talent, the make the greatest change to patients globally.” Source: RevenueBase Database · checked Sep 8, 2026
12	Clements Partners	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	1-10	6 contacts →
	Partial evidence “Clements Partners is a modern-day staffing provider for biopharmaceutical companies.” Source: RevenueBase Database · checked Sep 8, 2026
13	William Parker Group	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	1-10	6 contacts →
	Indirect evidence “William Parker Group specialises in placing across Pharma, Biotech, CRO, CDMO and eClinical organisations.” Source: RevenueBase Database · checked Sep 8, 2026
14	Objective Focus Limited	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	1-10	3 contacts →
	Indirect evidence “Our objective is connecting you with the right healthcare professionals.” Source: RevenueBase Database · checked Sep 8, 2026
15	Oxus Technologies Limited	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	51-200	3 contacts →
	Partial evidence “Oxus Technologies is one of the leading providers of advanced technology solutions and clinical research services to the life sciences industry.” Source: RevenueBase Database · checked Sep 8, 2026
16	Competitive Drug Development International LTD Cddi	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	1-10	3 contacts →
	Indirect evidence “CDDI is a specialist bio-medical consulting company based in London and Barcelona and founded in 2009 by R&D executives from top Pharma companies.” Source: RevenueBase Database · checked Sep 8, 2026
17	Pharmalancers LTD	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	1-10	3 contacts →
	Partial evidence “Pharmalancers is the Global Marketplace to connect independent consultants in Clinical research including clinical project managers, CRAs, quality, regulatory affairs, medical…” Source: RevenueBase Database · checked Sep 8, 2026
18	Chromosome Recruitment LTD	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	11-50	2 contacts →
	Indirect evidence “Chromosome Recruitment is an international agency specialized in healthcare recruitment and placement.” Source: RevenueBase Database · checked Sep 8, 2026
19	Bentley FOX LTD	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	11-50	2 contacts →
	Indirect evidence “With a combined 75+ years’ of Life Sciences Recruitment experience on our Management Team, we have built a strong reputation for long term engagement and effectiveness with…” Source: RevenueBase Database · checked Sep 8, 2026
20	Hvivo PLC	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	201-500	1 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 8, 2026
21	Research Support LTD	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	1-10	1 contacts →
	Partial evidence “Providing services to support clinical development including Project Management, CRO Supervision, Clinical Monitoring and Medical Writing.” Source: RevenueBase Database · checked Sep 8, 2026
22	Inspired Clinical Solutions	Strong evidence	London, United KingdomHQ checked Sep 8, 2026	1-10	1 contacts →
	Strong evidence “Welcome to Inspired Clinical Solutions, where we revolutionize clinical research through innovative decentralized trial services.” Source: RevenueBase Database · checked Sep 8, 2026
23	Kingsley Sharpe	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	1-10	1 contacts →
	Indirect evidence “Kingsley Sharpe Kingsley Sharpe provides a unique, flexible recruitment solution for nursing, pharmacy and management roles.” Source: RevenueBase Database · checked Sep 8, 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 trial staffing. 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 trial staffing.
Partial evidence: Its own public description names part of clinical trial staffing, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name clinical trial staffing. 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 23 of 64 clinical trial staffing based in London, United Kingdom

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Clinical trial staffing based in London, United Kingdom at a glance

As of Sep 8, 2026

55.2%Verified-email coverage

18.3%Mobile-number coverage

36.6Average contacts per company

1-10Median size (employees)

107.8%Largest-city concentration · London

Sep 8, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

1,001-5,000

Freshness & accuracy

How recently the business emails on this list were verified

Email last verified

1,1870–30

10031–60

061–90

290–180

5180+

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 trial staffing, 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 London, United Kingdom whose own description of what they do matches “clinical trial staffing”. 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 trial staffing), 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 trial staffing, and records with no verified work email. Companies headquartered outside London 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, 1,294 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 8, 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 trial staffing by metro in the United Kingdom

Clinical trial staffing in London69

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 trial staffing, 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 trial staffing are there based in London, United Kingdom?

RevenueBase identified 64 clinical trial staffing headquartered in London, 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 clinical trial staffing?

London leads with 69 headquartered companies, followed by Manchester (8) and Glasgow (6).

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 1,294 verified decision-maker contacts tracked across these 64 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 8, 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.