Company lists · Data refreshed September 2026

Top 25 Clinical research sites worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 2,468 companies tracked

RevenueBase identified 2,468 clinical research sites worldwide as of September 2026 and tracks 91,176 professional contacts across them, including 34,825 with verified work emails and 0 with mobile numbers. The United States is the largest market and Miami the largest hub.

This list covers clinical research sites 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 16, 2026. Country and city lists for clinical research sites 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 16, 2026 86% judged on-target in blind review

2,468Companies

91,176Contacts tracked

34,825Verified emails

0Mobile numbers

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The 25 largest clinical research sites worldwide

Ranked by team size

Top 25 of 2,468 clinical research sites worldwide, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to clinical research sites: 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	Strong evidence	Waltham, MA, United StatesHQ checked Sep 16, 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 16, 2026
2	PRA Health Sciences	Indirect evidence	Raleigh, NC, United StatesHQ checked Sep 16, 2026	10001+	4,708 contacts →
	Indirect evidence “PRA is now an ICON plc company.” Source: RevenueBase Database · checked Sep 16, 2026
3	Cliantha Research Limited	Strong evidence	Ahmedabad, IndiaHQ checked Sep 16, 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 16, 2026
4	Veeda Lifesciences	Strong evidence	Ahmedabad, IndiaHQ checked Sep 16, 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 Sep 16, 2026
5	WCG	Strong evidence	Cary, NC, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,103 contacts →
	Strong evidence “WCG is a true partner to research sponsors, CROs, sites and participants in navigating the clinical research journey.” Source: RevenueBase Database · checked Sep 16, 2026
6	Celerion	Strong evidence	Lincoln, NE, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,080 contacts →
	Strong evidence “Celerion, a leader in early clinical research, delivers Applied Translational Medicine.” Source: RevenueBase Database · checked Sep 16, 2026
7	CTI Clinical Trial And Consulting Services	Strong evidence	Covington, KY, United StatesHQ checked Sep 16, 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 16, 2026
8	Navitas Life Sciences	Strong evidence	Gaithersburg, MD, United StatesHQ checked Sep 16, 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 16, 2026
9	Velocity Clinical Research, INC	Strong evidence	Durham, NC, United StatesHQ checked Sep 16, 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 16, 2026
10	EMMES	Strong evidence	Rockville, MD, United StatesHQ checked Sep 16, 2026	1,001-5,000	961 contacts →
	Strong evidence “Emmes is a Contract Research Organization delivering complex clinical trials through therapeutic expertise, scientific rigor, and technology-enabled execution.” Source: RevenueBase Database · checked Sep 16, 2026
11	Bioagilytix	Partial evidence	Durham, NC, United StatesHQ checked Sep 16, 2026	1,001-5,000	915 contacts →
	Partial evidence “BioAgilytix is a leading global contract research organization focused on supporting pharmaceutical and biotech partners in all phases of drug development.” Source: RevenueBase Database · checked Sep 16, 2026
12	MMS	Strong evidence	Canton, MI, United StatesHQ checked Sep 16, 2026	501-1,000	876 contacts →
	Strong evidence “MMS Holdings (MMS) is an award-winning, data-focused clinical research organization (CRO) that supports the pharmaceutical and biotech industries with a proven, scientific…” Source: RevenueBase Database · checked Sep 16, 2026
13	Cenexel	Strong evidence	Salt Lake City, UT, United StatesHQ checked Sep 16, 2026	1,001-5,000	847 contacts →
	Strong 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 Sep 16, 2026
14	Caidya	Strong evidence	Raleigh, NC, United StatesHQ checked Sep 16, 2026	1,001-5,000	758 contacts →
	Strong evidence “Caidya is a multi-therapeutic clinical research organization (CRO) serving innovators worldwide.” Source: RevenueBase Database · checked Sep 16, 2026
15	RHO	Indirect evidence	Durham, NC, United StatesHQ checked Sep 16, 2026	501-1,000	732 contacts →
	Indirect evidence “Experience the Cohesion Effect.” Source: RevenueBase Database · checked Sep 16, 2026
16	Excelya	Indirect evidence	Boulogne-billancourt, FranceHQ checked Sep 16, 2026	501-1,000	652 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 Sep 16, 2026
17	DM Clinical Research	Strong evidence	Houston, TX, United StatesHQ checked Sep 16, 2026	501-1,000	590 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 Sep 16, 2026
18	Nucleus Network	Partial evidence	Melbourne, AustraliaHQ checked Sep 16, 2026	501-1,000	575 contacts →
	Partial evidence “Nucleus Network is the only global provider dedicated to early phase clinical trials, with units in Australia, the USA and the UK.” Source: RevenueBase Database · checked Sep 16, 2026
19	Pharma Medica Research INC	Partial evidence	Mississauga, ON, CanadaHQ checked Sep 16, 2026	201-500	568 contacts →
	Partial evidence “Pharma Medica Research is a full service early phase contract research organization.” Source: RevenueBase Database · checked Sep 16, 2026
20	Accelerated Enrollment Solutions	Indirect evidence	Horsham, PA, United StatesHQ checked Sep 16, 2026	1,001-5,000	561 contacts →
	Indirect evidence “Accelerated Enrollment Solutions (AES) is now Trialmed.” Source: RevenueBase Database · checked Sep 16, 2026
21	Crchuq	Partial evidence	Québec, QC, CanadaHQ checked Sep 16, 2026	1,001-5,000	554 contacts →
	Partial evidence “The CHU de Québec-Université Laval Research Center is one of the largest French-speaking medical research center in North America.” Source: RevenueBase Database · checked Sep 16, 2026
22	Axis Clinicals LTD	Strong evidence	Hyderabad, IndiaHQ checked Sep 16, 2026	201-500	535 contacts →
	Strong evidence “AXIS Clinicals Limited is one of the most experienced and fastest growing Clinical Research Organization.” Source: RevenueBase Database · checked Sep 16, 2026
23	Chiltern	Indirect evidence	Durham, NC, United StatesHQ checked Sep 16, 2026	10001+	532 contacts →
	Indirect evidence “THIS PAGE IS NOT MONITORED.” Source: RevenueBase Database · checked Sep 16, 2026
24	Raptim Research Pvt. LTD	Partial evidence	Mumbai, IndiaHQ checked Sep 16, 2026	201-500	471 contacts →
	Partial evidence “Welcome to Raptim Research Pvt.” Source: RevenueBase Database · checked Sep 16, 2026
25	M3 Global Research	Partial evidence	Fort Washington, PA, United StatesHQ checked Sep 16, 2026	201-500	444 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 Sep 16, 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 sites. 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 sites.
Partial evidence: Its own public description names part of clinical research sites, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name clinical research sites. 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 2,468 clinical research sites worldwide

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Clinical research sites worldwide at a glance

As of Sep 16, 2026

38.2%Verified-email coverage

36.9Average contacts per company

11-50Median size (employees)

3.1%Largest-city concentration · Miami

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

935

11-50

1,002

51-200

374

201-500

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 research sites, 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: 15 countries, largest first: the United States, India, the United Kingdom, Canada, Australia, Germany, Poland, Brazil, France, Mexico and 5 more. Country and city lists for clinical research sites are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “clinical research sites”. 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 sites), 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 sites, 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, 34,825 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 16, 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 sites by location

19 lists · largest first

Every Clinical research sites 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 sites, 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 sites are there worldwide?

RevenueBase identified 2,468 clinical research sites 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?

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

Which country has the most clinical research sites?

The United States leads with 1,414 companies, followed by India (274) and the United Kingdom (127). Every clinical research sites list by country and city is linked on this page.

Which city has the most clinical research sites?

Miami leads with 76 headquartered companies, followed by Houston (41) and New York (37).

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 34,825 verified decision-maker contacts tracked across these 2,468 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 16, 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.