Company lists · Data refreshed August 2026

Top 25 Clinical trial recruitment firms based in the United States

Name: Clinical trial recruitment firms based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Aug 31, 2026 1,769 companies tracked

RevenueBase identified 1,769 clinical trial recruitment firms headquartered in the United States as of August 2026 and tracks 78,869 professional contacts across them, including 34,926 with verified work emails and 19,814 with mobile numbers. Miami is the largest hub.

This list covers clinical trial recruitment firms headquartered in the United States, 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.

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

1,769Companies

78,869Contacts tracked

34,926Verified emails

19,814Mobile numbers

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

Ranked by team size

Top 25 of 1,769 clinical trial recruitment firms based in the United States, 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	Parexel	Partial evidence	Raleigh, NC, United States	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
2	Fortrea	Partial evidence	Research Triangle Park, NC, United States	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
3	Worldwide Clinical Trials	Strong evidence	Research Triangle Park, NC, United States	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
4	Precision For Medicine	Partial evidence	Cambridge, MA, United States	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
5	CYTEL	Strong evidence	Cambridge, MA, United States	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
6	Lambda Therapeutic Research	Partial evidence	Las Vegas, NV, United States	1,001-5,000	1,229 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
7	Suvoda	Strong evidence	Portland, OR, United States	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
8	Navitas Life Sciences	Partial evidence	Gaithersburg, MD, United States	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
9	Velocity Clinical Research, INC	Partial evidence	Grants Pass, OR, United States	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
10	Sarah Cannon Research Institute	Strong evidence	Nashville, TN, United States	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
11	Cenexel	Partial evidence	Berlin, NJ, United States	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
12	Caidya	Partial evidence	Raleigh, NC, United States	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
13	RHO	Indirect evidence	Durham, NC, United States	501-1,000	723 contacts →
	Indirect evidence “Experience the Cohesion Effect.” Source: RevenueBase Database · checked Aug 31, 2026
14	DM Clinical Research	Strong evidence	Philadelphia, PA, United States	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
15	Accelerated Enrollment Solutions	Indirect evidence	Horsham, PA, United States	1,001-5,000	565 contacts →
	Indirect evidence “Accelerated Enrollment Solutions (AES) is now Trialmed.” Source: RevenueBase Database · checked Aug 31, 2026
16	Titan Medical Group, LLC	Indirect evidence	Omaha, NE, United States	201-500	526 contacts →
	Indirect evidence “While the availability of medical technicians and professionals becomes increasingly limited, there seems to be no shortage of staffing firms.” Source: RevenueBase Database · checked Aug 31, 2026
17	Catalyst Clinical Research	Strong evidence	Wilmington, NC, United States	1,001-5,000	524 contacts →
	Strong evidence “Catalyst Clinical Research is now Worldwide Clinical Trials.” Source: RevenueBase Database · checked Aug 31, 2026
18	Raptim Research Pvt. LTD	Indirect evidence	Princeton, NJ, United States	201-500	474 contacts →
	Indirect evidence “Welcome to Raptim Research Pvt.” Source: RevenueBase Database · checked Aug 31, 2026
19	M3 Global Research	Partial evidence	Fort Washington, PA, United States	201-500	440 contacts →
	Partial evidence “M3 Global Research provides the most comprehensive and highest quality market research recruitment and support services available to the global healthcare industry with…” Source: RevenueBase Database · checked Aug 31, 2026
20	Sitero	Partial evidence	Coral Gables, FL, United States	501-1,000	388 contacts →
	Partial evidence “Sitero is a next-generation, site-focused clinical research organization (CRO) for life sciences and institutional research organizations that helps get treatments to market safer…” Source: RevenueBase Database · checked Aug 31, 2026
21	WEP Clinical	Strong evidence	Cary, NC, United States	201-500	319 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 Aug 31, 2026
22	Flourish Research	Strong evidence	Northridge, CA, United States	501-1,000	312 contacts →
	Strong evidence “Flourish Research is a fully integrated, multi-site clinical trial network serving sponsors and CROs across North America.” Source: RevenueBase Database · checked Aug 31, 2026
23	Science 37	Strong evidence	Morrisville, NC, United States	201-500	297 contacts →
	Strong evidence “Science 37 is a modern clinical research site that delivers trials directly to patients’ homes.” Source: RevenueBase Database · checked Aug 31, 2026
24	Florence Healthcare	Strong evidence	Atlanta, GA, United States	201-500	295 contacts →
	Strong evidence “Florence is a purpose-built platform that connects sponsors and sites to accelerate clinical trials, improve operational capacity, and reduce risk.” Source: RevenueBase Database · checked Aug 31, 2026
25	PCM Trials	Strong evidence	Denver, CO, United States	1,001-5,000	261 contacts →
	Strong evidence “PCM Trials acquired EmVenio Research and Netherlands-based Clinical Trials Service in 2024.” 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 1,769 clinical trial recruitment firms based in the United States

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

As of Aug 31, 2026

44.3%Verified-email coverage

25.1%Mobile-number coverage

44.6Average contacts per company

11-50Median size (employees)

3.7%Largest-city concentration · Miami

Aug 31, 2026Page data refreshed

Companies by employee count

1-10

796

11-50

641

51-200

226

201-500

501-1,000

1,001-5,000

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.
What qualifies: Companies headquartered in the United States 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. Companies headquartered outside United States 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, 34,926 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 August 31, 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 metro

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 based in the United States?

RevenueBase identified 1,769 clinical trial recruitment firms headquartered in the United States 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?

Parexel, headquartered in Raleigh, tops this list with the largest team on record.

Which city has the most clinical trial recruitment firms?

Miami leads with 66 headquartered companies, followed by New York (47) and Boston (43).

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 34,926 verified decision-maker contacts tracked across these 1,769 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on August 31, 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.