Company lists · Data refreshed September 2026

Top 25 Contract research organizations worldwide

Name: Contract research organizations worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 8,514 companies tracked

RevenueBase identified 8,514 contract research organizations worldwide as of September 2026 and tracks 477,241 professional contacts across them, including 187,896 with verified work emails and 0 with mobile numbers. The United States is the largest market and London the largest hub.

This list covers contract research organizations 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 19, 2026. Country and city lists for contract research organizations 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 19, 2026 86% judged on-target in blind review

8,514Companies

477,241Contacts tracked

187,896Verified emails

0Mobile numbers

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The 25 largest contract research organizations worldwide

Ranked by team size

Top 25 of 8,514 contract research organizations worldwide, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to contract research organizations: 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	IQVIA	Partial evidence	Durham, NC, United StatesHQ checked Sep 19, 2026	10001+	63,824 contacts →
	Partial evidence “IQVIA (NYSE:IQV) is a leading global provider of clinical research services, commercial insights and healthcare intelligence to the life sciences and healthcare industries.” Source: RevenueBase Database · checked Sep 19, 2026
2	Icon PLC	Indirect evidence	Dublin, JapanHQ checked Sep 19, 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 19, 2026
3	PPD	Partial evidence	Waltham, MA, United StatesHQ checked Sep 19, 2026	10001+	20,530 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 Sep 19, 2026
4	Parexel	Partial evidence	Raleigh, NC, United StatesHQ checked Sep 19, 2026	10001+	19,257 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 Sep 19, 2026
5	Syneos Health	Indirect evidence	Morrisville, NC, United StatesHQ checked Sep 19, 2026	10001+	18,228 contacts →
	Indirect evidence “Syneos Health® is a leading fully integrated biopharmaceutical solutions organization built to accelerate customer success.” Source: RevenueBase Database · checked Sep 19, 2026
6	Fortrea	Partial evidence	Research Triangle Park, NC, United StatesHQ checked Sep 19, 2026	10001+	10,632 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 Sep 19, 2026
7	Syngene International Limited	Partial evidence	Bengaluru, IndiaHQ checked Sep 19, 2026	5,001-10,000	8,064 contacts →
	Partial evidence “Syngene International Ltd.(BSE: 539268, NSE: SYNGENE, ISIN: INE398R01022) is an integrated research, development, and manufacturing services company serving the global…” Source: RevenueBase Database · checked Sep 19, 2026
8	Medpace	Strong evidence	Cincinnati, OH, United StatesHQ checked Sep 19, 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 19, 2026
9	Covance	Indirect evidence	Princeton, NJ, United StatesHQ checked Sep 19, 2026	10001+	5,220 contacts →
	Indirect evidence “As the drug development business of Laboratory Corporation of America Holdings (Labcorp) and the world’s most comprehensive drug development #CRO service company, we have helped…” Source: RevenueBase Database · checked Sep 19, 2026
10	PRA Health Sciences	Indirect evidence	Raleigh, NC, United StatesHQ checked Sep 19, 2026	10001+	4,708 contacts →
	Indirect evidence “PRA is now an ICON plc company.” Source: RevenueBase Database · checked Sep 19, 2026
11	Almac Group	Indirect evidence	Craigavon, United KingdomHQ checked Sep 19, 2026	5,001-10,000	4,577 contacts →
	Indirect evidence “Partnering to Advance Human Health A unique culture delivering exceptional solutions: Almac is a financially secure, privately owned organisation with 7,800+ employees globally.” Source: RevenueBase Database · checked Sep 19, 2026
12	Aragen Life Sciences	Indirect evidence	Hyderabad, IndiaHQ checked Sep 19, 2026	1,001-5,000	4,277 contacts →
	Indirect evidence “Aragen is a trusted R&D and manufacturing partner to the global life sciences industry.” Source: RevenueBase Database · checked Sep 19, 2026
13	Worldwide Clinical Trials	Indirect evidence	Research Triangle Park, NC, United StatesHQ checked Sep 19, 2026	1,001-5,000	3,440 contacts →
	Indirect 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 19, 2026
14	Eversana	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 19, 2026	5,001-10,000	3,149 contacts →
	Indirect evidence “EVERSANA® is a leading independent provider of global services to the life sciences industry.” Source: RevenueBase Database · checked Sep 19, 2026
15	Wuxi Apptec	Indirect evidence	Shanghai, ChinaHQ checked Sep 19, 2026	10001+	3,107 contacts →
	Indirect evidence “WuXi AppTec is a trusted partner and contributor to the pharmaceutical and life sciences industries, providing R&D and manufacturing services that help advance healthcare…” Source: RevenueBase Database · checked Sep 19, 2026
16	Evotec	Indirect evidence	Hamburg, GermanyHQ checked Sep 19, 2026	5,001-10,000	3,036 contacts →
	Indirect evidence “Evotec is a biotechnology company that is committed to advancing drug discovery and development.” Source: RevenueBase Database · checked Sep 19, 2026
17	Medidata Solutions	Indirect evidence	New York, NY, United StatesHQ checked Sep 19, 2026	1,001-5,000	2,704 contacts →
	Indirect evidence “Medidata is powering smarter treatments and healthier people through digital solutions to support clinical trials.” Source: RevenueBase Database · checked Sep 19, 2026
18	Premier Research	Partial evidence	Morrisville, NC, United StatesHQ checked Sep 19, 2026	1,001-5,000	2,584 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 Sep 19, 2026
19	PSI CRO	Strong evidence	Zug, SwitzerlandHQ checked Sep 19, 2026	1,001-5,000	2,494 contacts →
	Strong 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 19, 2026
20	Anthem Biosciences Limited	Strong evidence	Bangalore, IndiaHQ checked Sep 19, 2026	1,001-5,000	2,336 contacts →
	Strong evidence “Anthem Biosciences, a Bangalore-India based Contract Research Development Organization (CDMO) Anthem Bio offers a whole gamut of services dedicated to enabling and sustaining…” Source: RevenueBase Database · checked Sep 19, 2026
21	Signant Health	Partial evidence	Blue Bell, PA, United StatesHQ checked Sep 19, 2026	1,001-5,000	2,083 contacts →
	Partial 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 19, 2026
22	Propharma	Indirect evidence	Raleigh, NC, United StatesHQ checked Sep 19, 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 19, 2026
23	Patheon	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 19, 2026	10001+	2,004 contacts →
	Indirect evidence “Thermo Fisher Scientific provides industry-leading pharma services for drug development, clinical trial logistics, and commercial manufacturing through our Patheon™ brand.” Source: RevenueBase Database · checked Sep 19, 2026
24	Jubilant Biosys Limited	Strong evidence	Noida, IndiaHQ checked Sep 19, 2026	1,001-5,000	1,882 contacts →
	Strong evidence “Jubilant Biosys is an integrated Contract Research, Development and Manufacturing Organization (CRDMO) providing drug discovery, development, and GMP manufacturing services to…” Source: RevenueBase Database · checked Sep 19, 2026
25	Precision For Medicine	Partial evidence	Bethesda, MD, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,781 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 Sep 19, 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: contract research organizations. 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 contract research organizations.
Partial evidence: Its own public description names part of contract research organizations, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name contract research organizations. 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 8,514 contract research organizations worldwide

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Contract research organizations worldwide at a glance

As of Sep 19, 2026

39.4%Verified-email coverage

56.1Average contacts per company

11-50Median size (employees)

2.3%Largest-city concentration · London

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

3,916

11-50

2,772

51-200

1,155

201-500

312

501-1,000

149

1,001-5,000

135

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 contract research organizations, 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: 32 countries, largest first: the United States, India, the United Kingdom, France, Germany, Canada, China, Spain, Switzerland, Australia and 22 more. Country and city lists for contract research organizations are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “contract research organizations”. 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 contract research organizations), 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 contract research organizations, 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, 187,896 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 19, 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.

Contract research organizations by location

58 lists · largest first

Every Contract research organizations 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 contract research organizations, 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 contract research organizations are there worldwide?

RevenueBase identified 8,514 contract research organizations 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?

IQVIA, headquartered in Durham, tops this list with the largest team on record.

Which country has the most contract research organizations?

The United States leads with 3,488 companies, followed by India (1,170) and the United Kingdom (636). Every contract research organizations list by country and city is linked on this page.

Which city has the most contract research organizations?

London leads with 199 headquartered companies, followed by Hyderabad (182) and San Diego (101).

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 187,896 verified decision-maker contacts tracked across these 8,514 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 19, 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.