Company lists · Data verified August 2026

Top 25 Clinical trial staffing based in the United Kingdom

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

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 192 companies tracked

There are 192 clinical trial staffing headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 8,324 professional contacts across them, including 3,789 with verified work emails and 1,646 with mobile numbers. London is the largest hub.

This list covers clinical trial staffing headquartered in the United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Data current as of August 28, 2026.

192Companies

8,324Contacts tracked

3,789Verified emails

1,646Mobile numbers

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The 25 largest clinical trial staffing based in the United Kingdom

Ranked by team size

Top 25 of 192 clinical trial staffing based in the United Kingdom, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	Premier Research	Wokingham	1,001-5,000	2,637	1,223
2	Perceptive INC	London	1,001-5,000	1,197	736
3	Endpoint Clinical	London	501-1,000	623	463
4	Pharm-Olam, LLC	Bracknell	501-1,000	560	118
5	CALYX	Nottingham	1,001-5,000	457	117
6	Tech Observer	Manchester	501-1,000	332	116
7	Simbec-Orion	Tydfil	201-500	308	168
8	Theorem NOW Fortrea	Slough	10001+	286	1
9	Richmond Pharmacology	London	51-200	203	116
10	SCOUT	London	201-500	168	107
11	Clinirx	London	51-200	98	37
12	Sequani	Ledbury	51-200	87	48
13	Agenda Life Sciences	None	51-200	77	1
14	Proclinical Group	London	201-500	55	31
15	Hyper Recruitment Solutions	Loughton	11-50	47	28
16	Woodley Trial Solutions	Bolton	51-200	46	36
17	Blackfield Associates	Portsmouth	11-50	46	22
18	Niche Science & Technology LTD	Richmond	11-50	39	24
19	Seven Life Sciences	London	51-200	39	1
20	POP Science	London	11-50	37	1
21	Atlantic Research Group	Leatherhead	51-200	33	21
22	Clinvigilant Research	Dartford	51-200	23	12
23	Wren Healthcare	Sandwich	51-200	22	5
24	Verbatim Pharma	Berkhamsted	11-50	21	12
25	X4 Life Sciences	Torquay	51-200	20	17

Showing 25 of 192 clinical trial staffing based in the United Kingdom

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Clinical trial staffing based in the United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 69 HQs

1,646Contacts with mobile numbers

24Emails re-verified in last 30 days

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

10001+

Clinical trial staffing by metro

Metro	Companies
Clinical trial staffing in London	69
Clinical trial staffing in Manchester	8
Clinical trial staffing in Glasgow	6
Clinical trial staffing in Nottingham	6
Clinical trial staffing in Oxford	4
Clinical trial staffing in Slough	3
Clinical trial staffing in Bracknell	3

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “clinical trial staffing”, with match quality audited by blind human judging, and headquartered in the United Kingdom.
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: Contact records re-verify on a rolling cadence; 24 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many clinical trial staffing are there based in the United Kingdom?

There are 192 clinical trial staffing headquartered in the United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

Premier Research, headquartered in Wokingham, 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 3,789 verified decision-maker contacts tracked across these 192 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.