Company lists · Data refreshed September 2026
Top 25 Research and development outsourcing providers based in the United States
RevenueBase identified 1,598 research and development outsourcing providers headquartered in the United States as of September 2026 and tracks 271,826 professional contacts across them, including 123,594 with verified work emails and 74,648 with mobile numbers. San Diego is the largest hub.
This list covers research and development outsourcing providers 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 research and development outsourcing providers based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 70,907 | ||||
“About Thermo Fisher Scientific Thermo Fisher Scientific Inc.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 2 | 38,427 | ||||
“Clear and confident health care decisions begin with questions.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 3 | 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. | |||||
| 4 | 18,228 | ||||
“Syneos Health® is a leading fully integrated biopharmaceutical solutions organization built to accelerate customer success.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 5 | 14,166 | ||||
“At Charles River, we are guided by our strong purpose-to create healthier lives-which centers around the patients who rely on the therapeutics we help to develop, the animals in…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 6 | 10,632 | ||||
“Fortrea (Nasdaq: FTRE) is a leading global clinical research organization (CRO) dedicated to providing innovative clinical development solutions to the life sciences industry.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 7 | 5,960 | ||||
“Medpace is a scientifically-driven, global, full-service clinical contract research organization (CRO) providing Phase I-IV clinical development services to the biotechnology…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 8 | Worldwide Clinical TrialsPartial evidence | 3,440 | |||
“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: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 9 | 3,149 | ||||
“EVERSANA® is a leading independent provider of global services to the life sciences industry.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 10 | 2,704 | ||||
“Medidata is powering smarter treatments and healthier people through digital solutions to support clinical trials.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 11 | 2,584 | ||||
“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: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 12 | 2,079 | ||||
“At ProPharma, we help pharmaceutical, biotechnology, and medical device companies bring life-changing therapies to market.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 13 | 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. | |||||
| 14 | 1,645 | ||||
“KBI Biopharma is an award-winning biopharmaceutical contract services organization providing fully-integrated, accelerated drug development and biomanufacturing services to…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 15 | 1,516 | ||||
“ClinChoice is a leading global full & functional service CRO, renowned for its exceptional product development and lifecycle management capabilities across the pharmaceutical…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 16 | 1,194 | ||||
“GenScript Life Science Group is a part of GenScript Biotech Corporation.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 17 | 1,080 | ||||
“Celerion, a leader in early clinical research, delivers Applied Translational Medicine.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 18 | 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. | |||||
| 19 | 1,015 | ||||
“WHERE INSIGHTS LEAD TO ANSWERS Expect More In choosing a partner for discovery, development and research models, expect more: more attention, more insight, and a superlative…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 20 | 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. | |||||
| 21 | 977 | ||||
“Allucent is on a mission to help bring new therapies to light by solving the distinct challenges of small and mid-sized biotech companies.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 22 | EMMESPartial evidence | 961 | |||
“Emmes is a Contract Research Organization delivering complex clinical trials through therapeutic expertise, scientific rigor, and technology-enabled execution.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 23 | 960 | ||||
“Advanced Clinical is a clinical development and strategic resourcing organization committed to providing a better clinical experience across the drug development journey.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 24 | 915 | ||||
“BioAgilytix is a leading global contract research organization focused on supporting pharmaceutical and biotech partners in all phases of drug development.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 25 | 894 | ||||
“Discover how Excelra, a leader in biopharma data and analytics, uniquely blends scientific understanding with technological expertise.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 1,598 research and development outsourcing providers based in the United States
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Research and development outsourcing providers 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 research and development outsourcing providers, 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 “research and development outsourcing providers”. 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 research and development outsourcing providers, 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, 123,594 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.
Research and development outsourcing providers by metro
Frequently asked
How many research and development outsourcing providers are there based in the United States?
RevenueBase identified 1,598 research and development outsourcing providers 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?
Thermo Fisher Scientific, headquartered in Waltham, tops this list with the largest team on record.
Which city has the most research and development outsourcing providers?
San Diego leads with 52 headquartered companies, followed by New York (39) and Boston (34).
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 123,594 verified decision-maker contacts tracked across these 1,598 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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Research and development outsourcing providers by geography
- Research and development outsourcing providers based in the United Kingdom
- Research and development outsourcing providers based in France
- Research and development outsourcing providers based in Canada
- Research and development outsourcing providers based in Germany
- Research and development outsourcing providers based in Spain
- Research and development outsourcing providers based in Brazil
- Research and development outsourcing providers based in Australia
- Research and development outsourcing providers based in Italy
- Research and development outsourcing providers based in the Netherlands
- Research and development outsourcing providers based in Switzerland
- Research and development outsourcing providers based in Poland
- Research and development outsourcing providers based in Belgium
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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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