Company lists · Data refreshed September 2026

Top 25 Investigative site organizations worldwide

Name: Investigative site organizations worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 4,015 companies tracked

RevenueBase identified 4,015 investigative site organizations worldwide as of September 2026 and tracks 167,272 professional contacts across them, including 67,684 with verified work emails. The United States is the largest market and Miami the largest hub.

This list covers investigative site 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 20, 2026. Country and city lists for investigative site 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 20, 2026 86% judged on-target in blind review

4,015Companies

167,272Contacts tracked

67,684Verified emails

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The 25 largest investigative site organizations worldwide

Ranked by team size

Top 25 of 4,015 investigative site organizations worldwide, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to investigative site 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	Icon PLC	Indirect evidence	Dublin, JapanHQ checked Sep 20, 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 20, 2026
2	PPD	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 20, 2026	10001+	20,530 contacts →
	Indirect 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 20, 2026
3	Fortrea	Indirect evidence	Research Triangle Park, NC, United StatesHQ checked Sep 20, 2026	10001+	10,632 contacts →
	Indirect 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 20, 2026
4	Medpace	Indirect evidence	Cincinnati, OH, United StatesHQ checked Sep 20, 2026	5,001-10,000	5,960 contacts →
	Indirect 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 20, 2026
5	PSI CRO	Indirect evidence	Zug, SwitzerlandHQ checked Sep 20, 2026	1,001-5,000	2,494 contacts →
	Indirect 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 20, 2026
6	Propharma	Indirect evidence	Raleigh, NC, United StatesHQ checked Sep 20, 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 20, 2026
7	Novotech	Indirect evidence	Singapore, AustraliaHQ checked Sep 20, 2026	1,001-5,000	1,778 contacts →
	Indirect 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 20, 2026
8	Advarra	Indirect evidence	Columbia, MD, United StatesHQ checked Sep 20, 2026	501-1,000	1,581 contacts →
	Indirect evidence “Advarra provides the platform, insights, and expertise that make clinical trials more efficient and connected.” Source: RevenueBase Database · checked Sep 20, 2026
9	Veeda Lifesciences	Partial evidence	Ahmedabad, IndiaHQ checked Sep 20, 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 20, 2026
10	Perceptive INC	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	1,001-5,000	1,197 contacts →
	Indirect 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 20, 2026
11	WCG	Partial evidence	Cary, NC, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,103 contacts →
	Partial evidence “WCG is a true partner to research sponsors, CROs, sites and participants in navigating the clinical research journey.” Source: RevenueBase Database · checked Sep 20, 2026
12	Celerion	Indirect evidence	Lincoln, NE, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,080 contacts →
	Indirect evidence “Celerion, a leader in early clinical research, delivers Applied Translational Medicine.” Source: RevenueBase Database · checked Sep 20, 2026
13	CTI Clinical Trial And Consulting Services	Indirect evidence	Covington, KY, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,043 contacts →
	Indirect 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 20, 2026
14	Navitas Life Sciences	Indirect evidence	Gaithersburg, MD, United StatesHQ checked Sep 20, 2026	1,001-5,000	990 contacts →
	Indirect 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 20, 2026
15	Velocity Clinical Research, INC	Partial evidence	Durham, NC, United StatesHQ checked Sep 20, 2026	1,001-5,000	971 contacts →
	Partial evidence “Velocity is the world’s leading organization of fully integrated clinical research sites.” Source: RevenueBase Database · checked Sep 20, 2026
16	Huffpost	Indirect evidence	New York City, CA, United StatesHQ checked Sep 20, 2026	201-500	963 contacts →
	Indirect evidence “HuffPost is for the people, not the powerful.” Source: RevenueBase Database · checked Sep 20, 2026
17	EMMES	Indirect evidence	Rockville, MD, United StatesHQ checked Sep 20, 2026	1,001-5,000	961 contacts →
	Indirect 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 20, 2026
18	Bioagilytix	Indirect evidence	Durham, NC, United StatesHQ checked Sep 20, 2026	1,001-5,000	915 contacts →
	Indirect 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 20, 2026
19	MMS	Indirect evidence	Canton, MI, United StatesHQ checked Sep 20, 2026	501-1,000	876 contacts →
	Indirect 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 20, 2026
20	Cenexel	Partial evidence	Salt Lake City, UT, United StatesHQ checked Sep 20, 2026	1,001-5,000	847 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 Sep 20, 2026
21	Caidya	Indirect evidence	Raleigh, NC, United StatesHQ checked Sep 20, 2026	1,001-5,000	758 contacts →
	Indirect evidence “Caidya is a multi-therapeutic clinical research organization (CRO) serving innovators worldwide.” Source: RevenueBase Database · checked Sep 20, 2026
22	RHO	Indirect evidence	Durham, NC, United StatesHQ checked Sep 20, 2026	501-1,000	732 contacts →
	Indirect evidence “Experience the Cohesion Effect.” Source: RevenueBase Database · checked Sep 20, 2026
23	Excelya	Indirect evidence	Boulogne-billancourt, FranceHQ checked Sep 20, 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 20, 2026
24	DM Clinical Research	Partial evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	501-1,000	590 contacts →
	Partial evidence “DM Clinical Research is a network of clinical trial investigator sites with headquarters based out of Houston, Texas.” Source: RevenueBase Database · checked Sep 20, 2026
25	Veranex	Indirect evidence	Raleigh, NC, United StatesHQ checked Sep 20, 2026	1,001-5,000	542 contacts →
	Indirect evidence “Veranex is the world's first global Innovation Contract Research Organization (iCRO) providing integrated product development and contract research services for medical device and…” Source: RevenueBase Database · checked Sep 20, 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: investigative site 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 investigative site organizations.
Partial evidence: Its own public description names part of investigative site organizations, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name investigative site 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 4,015 investigative site organizations worldwide

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Investigative site organizations worldwide at a glance

As of Sep 20, 2026

40.5%Verified-email coverage

41.7Average contacts per company

11-50Median size (employees)

1.5%Largest-city concentration · Miami

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

1,703

11-50

1,497

51-200

551

201-500

138

501-1,000

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 investigative site 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: Every country. Country and city lists for investigative site organizations are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “investigative site 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 investigative site 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 investigative site 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, 67,684 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 20, 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.

Investigative site organizations by location

23 lists · largest first

Every Investigative site 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 investigative site 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 investigative site organizations are there worldwide?

RevenueBase identified 4,015 investigative site 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?

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

Which country has the most investigative site organizations?

The United States leads with 1,526 companies, followed by India (355) and the United Kingdom (167). Every investigative site organizations list by country and city is linked on this page.

Which city has the most investigative site organizations?

Miami leads with 62 headquartered companies, followed by London (51) and Houston (40).

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 67,684 verified decision-maker contacts tracked across these 4,015 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 20, 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.