Company lists · Data refreshed September 2026
Top 25 Patient recruitment companies based in the United States
RevenueBase identified 1,028 patient recruitment companies headquartered in the United States as of September 2026 and tracks 54,259 professional contacts across them, including 23,905 with verified work emails and 15,411 with mobile numbers. Miami is the largest hub.
This list covers patient recruitment companies headquartered in the United States, 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, how directly it supports the match, and when it was last checked. Data refreshed September 5, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 companies based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 20,530 | ||||
“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: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 2 | PRA Health SciencesIndirect evidence | 4,708 | |||
“PRA is now an ICON plc company.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 3 | 1,781 | ||||
“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: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 4 | 1,255 | ||||
“Suvoda is a global clinical trial technology company, now strengthened by our merger with Greenphire.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 5 | 1,043 | ||||
“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: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 6 | 990 | ||||
“Navitas Life Sciences is a global Clinical Research partner with over 35 years of expertise in Clinical, Regulatory, Safety, and Data Management solutions.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 7 | Velocity Clinical Research, INCIndirect evidence | 971 | |||
“Velocity is the world’s leading organization of fully integrated clinical research sites.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 8 | 847 | ||||
“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: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 9 | MMGStrong evidence | 770 | |||
“MMG is a full-service global health communications group that specializes in patient recruitment and retention.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 10 | 758 | ||||
“Caidya is a multi-therapeutic clinical research organization (CRO) serving innovators worldwide.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 11 | 732 | ||||
“Experience the Cohesion Effect.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 12 | 590 | ||||
“DM Clinical Research is a network of clinical trial investigator sites with headquarters based out of Houston, Texas.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 13 | 561 | ||||
“Accelerated Enrollment Solutions (AES) is now Trialmed.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 14 | 532 | ||||
“THIS PAGE IS NOT MONITORED.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 15 | 444 | ||||
“M3 Global Research provides the most comprehensive and highest quality market research recruitment and support services available to the global healthcare industry with…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 16 | 389 | ||||
“Sitero is a next-generation, site-focused clinical research organization (CRO) for life sciences and institutional research organizations that helps get treatments to market safer…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 17 | 329 | ||||
“Global Reach; Local Expertise Headquartered in Paramus, New Jersey, USA with offices in Singapore, Denmark, UK, and India, our exceptional team of 500+ professionals serves…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 18 | 321 | ||||
“Flourish Research is a fully integrated, multi-site clinical trial network serving sponsors and CROs across North America.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 19 | 295 | ||||
“Florence is a purpose-built platform that connects sponsors and sites to accelerate clinical trials, improve operational capacity, and reduce risk.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 20 | 291 | ||||
“Science 37 is a modern clinical research site that delivers trials directly to patients’ homes.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 21 | 260 | ||||
“PCM Trials acquired EmVenio Research and Netherlands-based Clinical Trials Service in 2024.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 22 | 254 | ||||
“Elligo Health Research is an integrated research organization founded to bridge the gap between cutting-edge clinical trials and the patients who need them-an idea that sparked…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 23 | 229 | ||||
“Since 2005, KlinEra has partnered with some of the largest pharmaceutical, biotech and device companies, providing innovative and customized clinical trial and research services.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 24 | 225 | ||||
“Biorasi is a global clinical research organization (CRO) that delivers speed-to-market strategies for small to midsized biotech and biopharma sponsors.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 25 | EmvenioIndirect evidence | 201 | |||
“EmVenio Clinical Research, a Professional Case Management subsidiary, operates from U.S.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 1,028 patient recruitment companies based in the United States
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Patient recruitment companies based in the United States at a glance
As of Sep 5, 2026Companies by employee count
Verified emails by last verification
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 companies, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in the United States whose own description of what they do matches “patient recruitment companies”. Matching reads each company's description, not its industry code or its name.
- What we exclude
- Companies whose own description does not clearly place them among patient recruitment companies, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
- 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 an evidence 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, 23,905 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 5, 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 companies by metro
Frequently asked
How many patient recruitment companies are there based in the United States?
RevenueBase identified 1,028 patient recruitment companies headquartered in the United States 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 city has the most patient recruitment companies?
Miami leads with 46 headquartered companies, followed by Houston (31) and New York (28).
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 23,905 verified decision-maker contacts tracked across these 1,028 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 5, 2026.
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Patient recruitment companies by geography
- Patient recruitment companies based in the United Kingdom
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- Patient recruitment companies based in Houston, United States
- Patient recruitment companies based in Miami, United States
- Patient recruitment companies based in New York, United States
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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 SmartSearch, 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.
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