Company lists · Data refreshed September 2026
Top 25 Patient recruitment clinical research companies worldwide
RevenueBase identified 3,538 patient recruitment clinical research companies worldwide as of September 2026 and tracks 154,876 professional contacts across them, including 64,083 with verified work emails. The United States is the largest market and Miami the largest hub.
This list covers patient recruitment clinical research companies 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 29, 2026. Country and city lists for patient recruitment clinical research companies 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.
The 25 largest patient recruitment clinical research companies worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 2 | 19,257 contacts → | ||||
Strong 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 29, 2026Thanks. The Data Team will review it. | |||||
| 3 | 10,632 contacts → | ||||
Strong 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 29, 2026Thanks. The Data Team will review it. | |||||
| 4 | 4,708 contacts → | ||||
Indirect evidence “PRA is now an ICON plc company.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 5 | 3,440 contacts → | ||||
Partial 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 29, 2026Thanks. The Data Team will review it. | |||||
| 6 | 2,584 contacts → | ||||
Strong 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 29, 2026Thanks. The Data Team will review it. | |||||
| 7 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 8 | 1,781 contacts → | ||||
Strong 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 29, 2026Thanks. The Data Team will review it. | |||||
| 9 | 1,778 contacts → | ||||
Strong 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 29, 2026Thanks. The Data Team will review it. | |||||
| 10 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 11 | 1,580 contacts → | ||||
Partial 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 Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 12 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 13 | 1,255 contacts → | ||||
Partial evidence “Suvoda is a global clinical trial technology company, now strengthened by our merger with Greenphire.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 14 | 1,235 contacts → | ||||
Strong 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 Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 15 | 1,197 contacts → | ||||
Strong 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 29, 2026Thanks. The Data Team will review it. | |||||
| 16 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 17 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 18 | 971 contacts → | ||||
Strong evidence “Velocity is the world’s leading organization of fully integrated clinical research sites.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 19 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 20 | 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 29, 2026Thanks. The Data Team will review it. | |||||
| 21 | 770 contacts → | ||||
Strong evidence “MMG is a full-service global health communications group that specializes in patient recruitment and retention.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 22 | 758 contacts → | ||||
Strong evidence “Caidya is a multi-therapeutic clinical research organization (CRO) serving innovators worldwide.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 23 | 735 contacts → | ||||
Partial evidence “TFS HealthScience is a full-service, global Contract Research Organization (CRO) that partners with biotechnology and pharmaceutical companies to advance innovative treatments and…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 24 | 732 contacts → | ||||
Indirect evidence “Experience the Cohesion Effect.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 25 | 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 29, 2026Thanks. The Data Team will review it. | |||||
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: patient recruitment clinical research companies. 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 patient recruitment clinical research companies.
- Partial evidence
- Its own public description names part of patient recruitment clinical research companies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name patient recruitment clinical research companies. 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 3,538 patient recruitment clinical research companies worldwide
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Patient recruitment clinical research companies worldwide at a glance
As of Sep 29, 2026Companies by employee count
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 patient recruitment clinical research companies, 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 patient recruitment clinical research companies are linked below.
- What qualifies
- Companies worldwide whose own description of what they do matches “patient recruitment clinical research companies”. 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 patient recruitment clinical research companies), 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 patient recruitment clinical research companies, 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, 64,083 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 29, 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.
Patient recruitment clinical research companies by location
26 lists · largest firstEvery Patient recruitment clinical research companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Patient recruitment clinical research companies based in the United States1,447
- Patient recruitment clinical research companies based in India270
- Patient recruitment clinical research companies based in the United Kingdom174
- Patient recruitment clinical research companies based in Germany103
- Patient recruitment clinical research companies based in Canada80
- Patient recruitment clinical research companies based in Australia78
- Patient recruitment clinical research companies based in Poland66
- Patient recruitment clinical research companies based in France57
- Patient recruitment clinical research companies based in Brazil45
- Patient recruitment clinical research companies based in Türkiye40
- Patient recruitment clinical research companies based in the Netherlands39
- Patient recruitment clinical research companies based in Belgium37
- Patient recruitment clinical research companies based in Mexico37
- Patient recruitment clinical research companies based in Spain36
- Patient recruitment clinical research companies based in Switzerland29
- Patient recruitment clinical research companies based in Italy28
- Patient recruitment clinical research companies based in South Africa25
Cities
- Patient recruitment clinical research companies based in Miami, United States67
- Patient recruitment clinical research companies based in Houston, United States43
- Patient recruitment clinical research companies based in London, United Kingdom41
- Patient recruitment clinical research companies based in New York, United States39
- Patient recruitment clinical research companies based in Atlanta, United States27
- Patient recruitment clinical research companies based in Boston, United States27
- Patient recruitment clinical research companies based in San Diego, United States26
- Patient recruitment clinical research companies based in Ahmedabad, India25
- Patient recruitment clinical research companies based in Austin, United States25
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 patient recruitment clinical research companies, 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 patient recruitment clinical research companies are there worldwide?
RevenueBase identified 3,538 patient recruitment clinical research companies 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 patient recruitment clinical research companies?
The United States leads with 1,447 companies, followed by India (270) and the United Kingdom (174). Every patient recruitment clinical research companies list by country and city is linked on this page.
Which city has the most patient recruitment clinical research companies?
Miami leads with 67 headquartered companies, followed by London (44) and Houston (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 64,083 verified decision-maker contacts tracked across these 3,538 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 29, 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.