Company lists · Data refreshed September 2026

Top 25 Clinical research staffing agencies worldwide

Name: Clinical research staffing agencies worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 27, 2026 7,208 companies tracked

RevenueBase identified 7,208 clinical research staffing agencies worldwide as of September 2026 and tracks 270,298 professional contacts across them, including 96,358 with verified work emails. The United States is the largest market and London the largest hub.

This list covers clinical research staffing agencies 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 September 27, 2026. Country and city lists for clinical research staffing agencies 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 HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 27, 2026 86% judged on-target in blind review

7,208Companies

270,298Contacts tracked

96,358Verified emails

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The 25 largest clinical research staffing agencies worldwide

Ranked by team size

Top 25 of 7,208 clinical research staffing agencies worldwide, ranked by team size, largest first. Data refreshed Sep 27, 2026. RevenueBase Smart Search rates how each company's information relates to clinical research staffing agencies: 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	Icon PLC	Indirect evidence	Dublin, JapanHQ checked Sep 27, 2026	10001+	26,555 contacts →
	Indirect evidence “Since our foundation in Dublin, Ireland in 1990, our mission has been to help our clients to accelerate the development of drugs and devices that save lives and improve quality of…” Source: RevenueBase Database · checked Sep 27, 2026
2	PPD	Strong evidence	Waltham, MA, United StatesHQ checked Sep 27, 2026	10001+	20,530 contacts →
	Strong 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 Sep 27, 2026
3	Parexel	Strong evidence	Raleigh, NC, United StatesHQ checked Sep 27, 2026	10001+	19,257 contacts →
	Strong 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 Sep 27, 2026
4	Fortrea	Strong evidence	Research Triangle Park, NC, United StatesHQ checked Sep 27, 2026	10001+	10,632 contacts →
	Strong 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 Sep 27, 2026
5	Medpace	Strong evidence	Cincinnati, OH, United StatesHQ checked Sep 27, 2026	5,001-10,000	5,960 contacts →
	Strong evidence “Medpace is a scientifically-driven, global, full-service clinical contract research organization (CRO) providing Phase I-IV clinical development services to the biotechnology…” Source: RevenueBase Database · checked Sep 27, 2026
6	Worldwide Clinical Trials	Partial evidence	Research Triangle Park, NC, United StatesHQ checked Sep 27, 2026	1,001-5,000	3,440 contacts →
	Partial 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 Sep 27, 2026
7	Premier Research	Strong evidence	Morrisville, NC, United StatesHQ checked Sep 27, 2026	1,001-5,000	2,584 contacts →
	Strong 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 Sep 27, 2026
8	PSI CRO	Partial evidence	Zug, SwitzerlandHQ checked Sep 27, 2026	1,001-5,000	2,494 contacts →
	Partial 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 Sep 27, 2026
9	Signant Health	Strong evidence	Blue Bell, PA, United StatesHQ checked Sep 27, 2026	1,001-5,000	2,083 contacts →
	Strong evidence “For 25+ years, Signant Health has been pioneering solutions and methodologies that propel clinical research programs toward regulatory success.” Source: RevenueBase Database · checked Sep 27, 2026
10	Propharma	Indirect evidence	Raleigh, NC, United StatesHQ checked Sep 27, 2026	1,001-5,000	2,079 contacts →
	Indirect evidence “At ProPharma, we help pharmaceutical, biotechnology, and medical device companies bring life-changing therapies to market.” Source: RevenueBase Database · checked Sep 27, 2026
11	Precision For Medicine	Strong evidence	Bethesda, MD, United StatesHQ checked Sep 27, 2026	1,001-5,000	1,781 contacts →
	Strong 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 Sep 27, 2026
12	Novotech	Strong evidence	Singapore, AustraliaHQ checked Sep 27, 2026	1,001-5,000	1,778 contacts →
	Strong evidence “Novotech is a globally recognized full-service clinical research organization (CRO) and scientific advisory company that provides biotech and small- to mid-sized pharma companies…” Source: RevenueBase Database · checked Sep 27, 2026
13	Cliantha Research Limited	Strong evidence	Ahmedabad, IndiaHQ checked Sep 27, 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 Sep 27, 2026
14	CYTEL	Partial evidence	Cambridge, MA, United StatesHQ checked Sep 27, 2026	1,001-5,000	1,580 contacts →
	Partial 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 Sep 27, 2026
15	Triage Staffing Healthcare Staffing	Indirect evidence	Omaha, NE, United StatesHQ checked Sep 27, 2026	n/a	1,538 contacts →
	Indirect evidence “In recruiting, stating actual facts has become: Foreign \| Uncommon \| Taboo.” Source: RevenueBase Database · checked Sep 27, 2026
16	Adecco Medical	Indirect evidence	Villeurbanne, FranceHQ checked Sep 27, 2026	201-500	1,493 contacts →
	Indirect evidence “Adecco Medical est le leader des solutions emploi des professionnels de la santé : Infirmier, IADE, IBODE, aide-soignant, Kinésithérapeute, Pharmacien, Ergothérapeute, Médecin, ….” Source: RevenueBase Database · checked Sep 27, 2026
17	Veeda Lifesciences	Partial evidence	Ahmedabad, IndiaHQ checked Sep 27, 2026	501-1,000	1,320 contacts →
	Partial 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 Sep 27, 2026
18	Lambda Therapeutic Research	Strong evidence	Ahmedabad, IndiaHQ checked Sep 27, 2026	1,001-5,000	1,235 contacts →
	Strong 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 Sep 27, 2026
19	Perceptive INC	Strong evidence	London, United KingdomHQ checked Sep 27, 2026	1,001-5,000	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 27, 2026
20	locumtenens.com	Partial evidence	Alpharetta, GA, United StatesHQ checked Sep 27, 2026	501-1,000	1,171 contacts →
	Partial evidence “LocumTenens.com specializes in optimizing healthcare staffing operations.” Source: RevenueBase Database · checked Sep 27, 2026
21	Totalmed	Partial evidence	Appleton, WI, United StatesHQ checked Sep 27, 2026	201-500	1,170 contacts →
	Partial evidence “TotalMed provides temporary, contract, and full time staffing services to hospitals, medical groups, health plans, and life sciences companies who require staffing assistance in…” Source: RevenueBase Database · checked Sep 27, 2026
22	Planet Pharma	Partial evidence	Raleigh, NC, United StatesHQ checked Sep 27, 2026	1,001-5,000	1,088 contacts →
	Partial evidence “Founded in 2012, Planet Pharma is a global leader in life sciences recruitment and staffing, specializing in Pharmaceuticals, Biotechnology, Medical Device, Labs & Healthcare…” Source: RevenueBase Database · checked Sep 27, 2026
23	CTI Clinical Trial And Consulting Services	Strong evidence	Covington, KY, United StatesHQ checked Sep 27, 2026	1,001-5,000	1,043 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 Sep 27, 2026
24	Navitas Life Sciences	Strong evidence	Gaithersburg, MD, United StatesHQ checked Sep 27, 2026	1,001-5,000	990 contacts →
	Strong 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 Sep 27, 2026
25	Velocity Clinical Research, INC	Strong evidence	Durham, NC, United StatesHQ checked Sep 27, 2026	1,001-5,000	971 contacts →
	Strong evidence “Velocity is the world’s leading organization of fully integrated clinical research sites.” Source: RevenueBase Database · checked Sep 27, 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 research staffing agencies. 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 research staffing agencies.
Partial evidence: Its own public description names part of clinical research staffing agencies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name clinical research staffing agencies. 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 7,208 clinical research staffing agencies worldwide

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Clinical research staffing agencies worldwide at a glance

As of Sep 27, 2026

35.6%Verified-email coverage

37.5Average contacts per company

11-50Median size (employees)

2.9%Largest-city concentration · London

Sep 27, 2026Page data refreshed

Companies by employee count

1-10

3,206

11-50

2,219

51-200

1,146

201-500

345

501-1,000

137

1,001-5,000

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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 research staffing agencies, 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: Every country. Country and city lists for clinical research staffing agencies are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “clinical research staffing agencies”. 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 research staffing agencies), 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 research staffing agencies, 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, 96,358 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 27, 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 research staffing agencies by location

40 lists · largest first

Every Clinical research staffing agencies 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 research staffing agencies, 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 research staffing agencies are there worldwide?

RevenueBase identified 7,208 clinical research staffing agencies worldwide 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?

Icon PLC, headquartered in Worldwide, tops this list with the largest team on record.

Which country has the most clinical research staffing agencies?

The United States leads with 2,968 companies, followed by the United Kingdom (627) and India (434). Every clinical research staffing agencies list by country and city is linked on this page.

Which city has the most clinical research staffing agencies?

London leads with 206 headquartered companies, followed by New York (98) and Miami (65).

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 96,358 verified decision-maker contacts tracked across these 7,208 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 27, 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.