Company lists · Data verified August 2026

Top 25 Clinical trial recruitment firms based in the United Kingdom

Name: Clinical trial recruitment firms 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 212 companies tracked

There are 212 clinical trial recruitment firms headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 10,379 professional contacts across them, including 4,927 with verified work emails and 1,882 with mobile numbers. London is the largest hub.

This list covers clinical trial recruitment firms 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.

212Companies

10,379Contacts tracked

4,927Verified emails

1,882Mobile numbers

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The 25 largest clinical trial recruitment firms based in the United Kingdom

Ranked by team size

Top 25 of 212 clinical trial recruitment firms 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	Nucleus Network	London	501-1,000	572	319
5	Citeline	London	501-1,000	475	190
6	CALYX	Nottingham	1,001-5,000	457	117
7	Phastar	Glasgow	501-1,000	383	298
8	MAC Clinical Research	n/a	201-500	347	177
9	Tech Observer	Manchester	501-1,000	332	116
10	Simbec-Orion	Tydfil	201-500	308	168
11	Theorem NOW Fortrea	Slough	10001+	286	1
12	HVIVO	London	51-200	213	94
13	Richmond Pharmacology	London	51-200	203	116
14	SCOUT	London	201-500	168	107
15	Link Medical	London	51-200	146	92
16	Panthera Biopartners	Preston	11-50	128	97
17	Medicines Evaluation Unit Ltd, An Iqvia Business	Manchester	51-200	96	65
18	ARC Regulatory	Belfast	11-50	43	9
19	Ellipses Pharma	London	51-200	40	32
20	Esms Global LTD	London	51-200	37	25
21	Atlantic Research Group	Leatherhead	51-200	33	21
22	Research Grid R.Grid	Norwich	51-200	25	11
23	Albion RYE Associates	Redhill	11-50	24	15
24	Antidote Technologies	London	11-50	24	12
25	Research Organisation KC LTD	London	11-50	23	19

Showing 25 of 212 clinical trial recruitment firms based in the United Kingdom

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Clinical trial recruitment firms based in the United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 72 HQs

1,882Contacts with mobile numbers

27Emails re-verified in last 30 days

Companies by employee count

1-10

117

11-50

51-200

201-500

501-1,000

1,001-5,000

10001+

Clinical trial recruitment firms by metro

Metro	Companies
Clinical trial recruitment firms in London	72
Clinical trial recruitment firms in Manchester	12
Clinical trial recruitment firms in Glasgow	8
Clinical trial recruitment firms in Cambridge	5
Clinical trial recruitment firms in Nottingham	5
Clinical trial recruitment firms in Belfast	4
Clinical trial recruitment firms in Slough	4

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 recruitment firms”, 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; 27 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 recruitment firms are there based in the United Kingdom?

There are 212 clinical trial recruitment firms 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 recruitment firms?

London leads with 72 headquartered companies, followed by Manchester (12) 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 4,927 verified decision-maker contacts tracked across these 212 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.