Company lists · Data refreshed August 2026

Top 25 Clinical trial recruitment firms worldwide

Name: Clinical trial recruitment firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Aug 31, 2026 3,071 companies tracked

RevenueBase identified 3,071 clinical trial recruitment firms worldwide as of August 2026 and tracks 145,518 professional contacts across them, including 61,976 with verified work emails and 28,359 with mobile numbers. The United States is the largest market and London the largest hub.

This list covers clinical trial recruitment firms worldwide, 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 August 31, 2026. Country and city lists for clinical trial recruitment firms follow the table.

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 RevenueBase Smart Search rating on every row Refreshed Aug 31, 2026 86% judged on-target in blind review

3,071Companies

145,518Contacts tracked

61,976Verified emails

28,359Mobile numbers

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The 25 largest clinical trial recruitment firms worldwide

Ranked by team size

Top 25 of 3,071 clinical trial recruitment firms worldwide, ranked by team size, largest first. Data refreshed Aug 31, 2026. RevenueBase Smart Search rates how each company's information relates to clinical trial recruitment firms: 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	PPD	Partial evidence	Ubatuba, BR	10001+	20,510 contacts →
	Partial evidence “The PPD™ clinical research business of Thermo Fisher Scientific, the world leader in serving science, enables customers to accelerate innovation and drug development through…” Source: RevenueBase Database · checked Aug 31, 2026
2	Parexel	Partial evidence	Raleigh, NC, US	10001+	19,419 contacts →
	Partial evidence “Parexel is a leading global clinical research organization (CRO) providing insights-driven Clinical and Consulting solutions to the world’s life sciences industry.” Source: RevenueBase Database · checked Aug 31, 2026
3	Fortrea	Partial evidence	Research Triangle Park, NC, US	10001+	10,753 contacts →
	Partial evidence “Fortrea (Nasdaq: FTRE) is a leading global clinical research organization (CRO) dedicated to providing innovative clinical development solutions to the life sciences industry.” Source: RevenueBase Database · checked Aug 31, 2026
4	Worldwide Clinical Trials	Strong evidence	Research Triangle Park, NC, US	1,001-5,000	3,481 contacts →
	Strong evidence “Worldwide Clinical Trials (Worldwide) is a global CRO serving development-driven biopharmaceutical companies, with more than 4,400 professionals operating across more than 70…” Source: RevenueBase Database · checked Aug 31, 2026
5	Premier Research	Partial evidence	Wokingham, GB	1,001-5,000	2,637 contacts →
	Partial evidence “Premier Research International LLC (Premier) is a global leader in clinical research and consulting services with expertise in driving an efficient and effective path to market…” Source: RevenueBase Database · checked Aug 31, 2026
6	PSI CRO	Indirect evidence	Zug, SwitzerlandHQ checked Aug 31, 2026	1,001-5,000	2,494 contacts →
	Indirect evidence “PSI is a leading full-service global Contract Research Organization whose key strength is predictable patient enrollment across multiple therapeutic areas.” Source: RevenueBase Database · checked Aug 31, 2026
7	Precision For Medicine	Partial evidence	Cambridge, MA, US	1,001-5,000	1,763 contacts →
	Partial evidence “Precision for Medicine is an industry-leading global clinical research services organization, purpose-built to improve the clinical research and development process for new…” Source: RevenueBase Database · checked Aug 31, 2026
8	Cliantha Research Limited	Strong evidence	Ahmedabad, IndiaHQ checked Aug 31, 2026	1,001-5,000	1,612 contacts →
	Strong evidence “Cliantha Research, full-service clinical research organization (CRO), provides comprehensive and integrated offerings in Early Phase (BA/BE and Phase I) trials, Late Phase (Phase…” Source: RevenueBase Database · checked Aug 31, 2026
9	CYTEL	Strong evidence	Cambridge, MA, US	1,001-5,000	1,571 contacts →
	Strong evidence “Cytel is the world’s leading data-science CRO, driving advancements in human health through robust analytics and innovative clinical trial software.” Source: RevenueBase Database · checked Aug 31, 2026
10	Veeda Lifesciences	Strong evidence	Ahmedabad, IndiaHQ checked Aug 31, 2026	501-1,000	1,320 contacts →
	Strong evidence “We partner with innovator and generic companies using our high-quality infrastructure and a global network of clinical trial sites, to launch novel therapies and new products for…” Source: RevenueBase Database · checked Aug 31, 2026
11	Lambda Therapeutic Research	Partial evidence	Ahmedabad, IndiaHQ checked Aug 31, 2026	1,001-5,000	1,235 contacts →
	Partial evidence “Lambda Therapeutic Research is a leading full-service Global Clinical Research Organization (CRO) headquartered in Ahmedabad (India), with facilities and operations in Mehsana…” Source: RevenueBase Database · checked Aug 31, 2026
12	Suvoda	Strong evidence	Portland, OR, US	1,001-5,000	1,223 contacts →
	Strong evidence “Suvoda is a global clinical trial technology company, now strengthened by our merger with Greenphire.” Source: RevenueBase Database · checked Aug 31, 2026
13	Perceptive INC	Partial evidence	London, GB	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 Aug 31, 2026
14	CTI Clinical Trial And Consulting Services	Strong evidence	Sydney, AU	1,001-5,000	1,036 contacts →
	Strong evidence “CTI Clinical Trial and Consulting Services is a global, privately held, research service organization, delivering a complete spectrum of clinical trial and consulting services…” Source: RevenueBase Database · checked Aug 31, 2026
15	Navitas Life Sciences	Partial evidence	Gaithersburg, MD, US	1,001-5,000	991 contacts →
	Partial evidence “Navitas Life Sciences is a global Clinical Research partner with over 35 years of expertise in Clinical, Regulatory, Safety, and Data Management solutions.” Source: RevenueBase Database · checked Aug 31, 2026
16	Velocity Clinical Research, INC	Partial evidence	Grants Pass, OR, US	1,001-5,000	961 contacts →
	Partial evidence “Velocity is the world’s leading organization of fully integrated clinical research sites.” Source: RevenueBase Database · checked Aug 31, 2026
17	Sarah Cannon Research Institute	Strong evidence	Nashville, TN, US	501-1,000	882 contacts →
	Strong evidence “Sarah Cannon Research Institute (SCRI) is one of the world’s leading oncology research organizations, conducting community-based clinical trials.” Source: RevenueBase Database · checked Aug 31, 2026
18	Cenexel	Partial evidence	Berlin, NJ, US	1,001-5,000	843 contacts →
	Partial evidence “CenExel is a leading integrated, wholly owned, nationwide clinical research site network comprised of 18 Centers of Excellence in major metropolitan areas across the U.” Source: RevenueBase Database · checked Aug 31, 2026
19	Caidya	Partial evidence	Raleigh, NC, US	1,001-5,000	749 contacts →
	Partial evidence “Caidya is a multi-therapeutic clinical research organization (CRO) serving innovators worldwide.” Source: RevenueBase Database · checked Aug 31, 2026
20	TFS Healthscience	Indirect evidence	Munich, DE	501-1,000	737 contacts →
	Indirect evidence “TFS HealthScience is a full-service, global Contract Research Organization (CRO) that partners with biotechnology and pharmaceutical companies to advance innovative treatments and…” Source: RevenueBase Database · checked Aug 31, 2026
21	RHO	Indirect evidence	Durham, NC, US	501-1,000	723 contacts →
	Indirect evidence “Experience the Cohesion Effect.” Source: RevenueBase Database · checked Aug 31, 2026
22	Excelya	Indirect evidence	Lyon, FR	501-1,000	662 contacts →
	Indirect evidence “Excelya is an independent partner that serves Biotech, Pharma, and Medical Device organizations with a comprehensive range of Full-service CRO, FSP, and Resourcing solutions…” Source: RevenueBase Database · checked Aug 31, 2026
23	Endpoint Clinical	Strong evidence	London, GB	501-1,000	623 contacts →
	Strong evidence “Clinical trials are designed around endpoints, but it’s the beginning that sets them up for success-including selecting the best RTSM partner for continuous and flexible support…” Source: RevenueBase Database · checked Aug 31, 2026
24	Alimentiv	Strong evidence	Amsterdam, NL	501-1,000	616 contacts →
	Strong evidence “Industry-leading specialty GI contract research organization (CRO) transforming clinical trial outcomes and accelerating the development of life-changing therapies.” Source: RevenueBase Database · checked Aug 31, 2026
25	DM Clinical Research	Strong evidence	Philadelphia, PA, US	501-1,000	586 contacts →
	Strong evidence “DM Clinical Research is a network of clinical trial investigator sites with headquarters based out of Houston, Texas.” Source: RevenueBase Database · checked Aug 31, 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 recruitment firms. 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 recruitment firms.
Partial evidence: Its own public description names part of clinical trial recruitment firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name clinical trial recruitment firms. 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 3,071 clinical trial recruitment firms worldwide

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Clinical trial recruitment firms worldwide at a glance

As of Aug 31, 2026

42.6%Verified-email coverage

19.5%Mobile-number coverage

47.4Average contacts per company

11-50Median size (employees)

2.5%Largest-city concentration · London

Aug 31, 2026Page data refreshed

Companies by employee count

1-10

1,334

11-50

1,092

51-200

424

201-500

118

501-1,000

1,001-5,000

5,001-10,000

10001+

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 recruitment firms, 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.
Coverage: 18 countries, largest first: the United States, India, the United Kingdom, Australia, Germany, Canada, Poland, France, Brazil, Türkiye and 8 more. Country and city lists for clinical trial recruitment firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “clinical trial recruitment firms”. 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 recruitment firms), 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 recruitment firms, and records with no verified work email.
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, 61,976 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 between August 31, 2026 and September 14, 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 recruitment firms by location

31 lists · largest first

Every Clinical trial recruitment firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 recruitment firms, 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 recruitment firms are there worldwide?

RevenueBase identified 3,071 clinical trial recruitment firms worldwide as of August 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?

PPD, headquartered in Ubatuba, tops this list with the largest team on record.

Which country has the most clinical trial recruitment firms?

The United States leads with 1,769 companies, followed by India (298) and the United Kingdom (212). Every clinical trial recruitment firms list by country and city is linked on this page.

Which city has the most clinical trial recruitment firms?

London leads with 77 headquartered companies, followed by Miami (66) and New York (47).

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 61,976 verified decision-maker contacts tracked across these 3,071 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled from the company graph between August 31, 2026 and September 14, 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.