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Company lists · Data verified August 2026

Top 25 Clinical trial recruitment firms based in the United States

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 1,769 companies tracked

There are 1,769 clinical trial recruitment firms headquartered in the United States (RevenueBase, August 2026). RevenueBase 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. Data current as of August 28, 2026.

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 verified Aug 28, 2026. Click a count to unlock that company's people.
#CompanyHQEmployeesContactsVerified emails
1ParexelRaleigh, NC10001+19,4199,824
2FortreaResearch Triangle Park, NC10001+10,7535,357
3Worldwide Clinical TrialsResearch Triangle Park, NC1,001-5,0003,4812,118
4Precision For MedicineCambridge, MA1,001-5,0001,7631,200
5CYTELCambridge, MA1,001-5,0001,571932
6Lambda Therapeutic ResearchLas Vegas, NV1,001-5,0001,229399
7SuvodaPortland, OR1,001-5,0001,223963
8Navitas Life SciencesGaithersburg, MD1,001-5,000991275
9Velocity Clinical Research, INCGrants Pass, OR1,001-5,000961683
10Sarah Cannon Research InstituteNashville, TN501-1,000882435
11CenexelBerlin, NJ1,001-5,00084332
12CaidyaRaleigh, NC1,001-5,000749537
13RHODurham, NC501-1,000723565
14DM Clinical ResearchPhiladelphia, PA501-1,00058639
15Accelerated Enrollment SolutionsHorsham, PA1,001-5,000565117
16Titan Medical Group, LLCOmaha, NE201-500526121
17Catalyst Clinical ResearchWilmington, NC1,001-5,000524294
18Raptim Research Pvt. LTDPrinceton, NJ201-5004743
19M3 Global ResearchFort Washington, PA201-500440268
20SiteroCoral Gables, FL501-1,000388201
21WEP ClinicalCary, NC201-500319207
22Flourish ResearchNorthridge, CA501-1,000312202
23Science 37Morrisville, NC201-50029799
24Florence HealthcareAtlanta, GA201-500295158
25PCM TrialsDenver, CO1,001-5,000261172

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 28, 2026
11-50Median size (employees)
MiamiLargest hub · 66 HQs
19,814Contacts with mobile numbers
194Emails re-verified in last 30 days

Companies by employee count

1-10
796
11-50
641
51-200
226
201-500
55
501-1,000
13
1,001-5,000
26
10001+
5

Clinical trial recruitment firms by metro

MetroCompanies
Clinical trial recruitment firms in Miami66
Clinical trial recruitment firms in New York47
Clinical trial recruitment firms in Boston43
Clinical trial recruitment firms in Houston42
Clinical trial recruitment firms in San Diego34
Clinical trial recruitment firms in Atlanta31
Clinical trial recruitment firms in San Francisco28
Clinical trial recruitment firms in Chicago26

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 States.
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; 194 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 States?

There are 1,769 clinical trial recruitment firms headquartered in the United States as of August 2026 (RevenueBase).

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

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Related lists

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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.

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