Company lists · Data refreshed September 2026

Top 25 Pharmaceutical research outsourcing based in the United States

Name: Pharmaceutical research outsourcing based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 5, 2026 2,181 companies tracked

RevenueBase identified 2,181 pharmaceutical research outsourcing headquartered in the United States as of September 2026 and tracks 213,551 professional contacts across them, including 88,242 with verified work emails and 59,085 with mobile numbers. San Diego is the largest hub.

This list covers pharmaceutical research outsourcing 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.

How to read this list HQ checked on every row Match evidence on every row Refreshed Sep 5, 2026 86% judged on-target in blind review

2,181Companies

213,551Contacts tracked

88,242Verified emails

59,085Mobile numbers

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The 25 largest pharmaceutical research outsourcing based in the United States

Ranked by team size

Top 25 of 2,181 pharmaceutical research outsourcing based in the United States, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names pharmaceutical research outsourcing: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	LabcorpIndirect evidence	Burlington, NC, United StatesHQ checked Sep 5, 2026	10001+	38,427
	“Clear and confident health care decisions begin with questions.” Source: company website · checked Sep 5, 2026
2	PPDPartial evidence	Waltham, MA, United StatesHQ checked Sep 5, 2026	10001+	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, 2026
3	ParexelPartial evidence	Raleigh, NC, United StatesHQ checked Sep 5, 2026	10001+	19,257
	“Parexel is a leading global clinical research organization (CRO) providing insights-driven Clinical and Consulting solutions to the world’s life sciences industry.” Source: company website · checked Sep 5, 2026
4	FortreaPartial evidence	Research Triangle Park, NC, United StatesHQ checked Sep 5, 2026	10001+	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, 2026
5	MedpacePartial evidence	Cincinnati, OH, United StatesHQ checked Sep 5, 2026	5,001-10,000	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, 2026
6	PRA Health SciencesIndirect evidence	Raleigh, NC, United StatesHQ checked Sep 5, 2026	10001+	4,708
	“PRA is now an ICON plc company.” Source: company website · checked Sep 5, 2026
7	Worldwide Clinical TrialsIndirect evidence	Research Triangle Park, NC, United StatesHQ checked Sep 5, 2026	1,001-5,000	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, 2026
8	EversanaIndirect evidence	Chicago, IL, United StatesHQ checked Sep 5, 2026	5,001-10,000	3,149
	“EVERSANA® is a leading independent provider of global services to the life sciences industry.” Source: company website · checked Sep 5, 2026
9	Premier ResearchPartial evidence	Morrisville, NC, United StatesHQ checked Sep 5, 2026	1,001-5,000	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, 2026
10	Signant HealthPartial evidence	Blue Bell, PA, United StatesHQ checked Sep 5, 2026	1,001-5,000	2,083
	“For 25+ years, Signant Health has been pioneering solutions and methodologies that propel clinical research programs toward regulatory success.” Source: company website · checked Sep 5, 2026
11	PropharmaPartial evidence	Raleigh, NC, United StatesHQ checked Sep 5, 2026	1,001-5,000	2,079
	“At ProPharma, we help pharmaceutical, biotechnology, and medical device companies bring life-changing therapies to market.” Source: company website · checked Sep 5, 2026
12	PatheonIndirect evidence	Waltham, MA, United StatesHQ checked Sep 5, 2026	10001+	2,004
	“Thermo Fisher Scientific provides industry-leading pharma services for drug development, clinical trial logistics, and commercial manufacturing through our Patheon™ brand.” Source: company website · checked Sep 5, 2026
13	Precision For MedicinePartial evidence	Bethesda, MD, United StatesHQ checked Sep 5, 2026	1,001-5,000	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, 2026
14	KBI BiopharmaIndirect evidence	Durham, NC, United StatesHQ checked Sep 5, 2026	1,001-5,000	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, 2026
15	Eurofins Lancaster LaboratoriesPartial evidence	Lancaster, PA, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,638
	“Eurofins Lancaster Laboratories is one of the largest commercial contract laboratories in the world providing comprehensive laboratory services in the pharmaceutical…” Source: company website · checked Sep 5, 2026
16	CYTELIndirect evidence	Cambridge, MA, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,580
	“Cytel is the world’s leading data-science CRO, driving advancements in human health through robust analytics and innovative clinical trial software.” Source: company website · checked Sep 5, 2026
17	ClinchoicePartial evidence	Horsham, PA, United StatesHQ checked Sep 5, 2026	1,001-5,000	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, 2026
18	NAMSAPartial evidence	Toledo, OH, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,275
	“Helping medical device Sponsors improve healthcare since 1967, NAMSA is the world’s leading MedTech Contract Research Organization (CRO) offering global end-to-end development…” Source: company website · checked Sep 5, 2026
19	NorstellaIndirect evidence	One Penn Plaza, NY, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,163
	“Norstella is the AI company for biopharma's highest-stakes decisions.” Source: company website · checked Sep 5, 2026
20	WCGPartial evidence	Cary, NC, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,103
	“WCG is a true partner to research sponsors, CROs, sites and participants in navigating the clinical research journey.” Source: company website · checked Sep 5, 2026
21	CelerionPartial evidence	Lincoln, NE, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,080
	“Celerion, a leader in early clinical research, delivers Applied Translational Medicine.” Source: company website · checked Sep 5, 2026
22	CTI Clinical Trial And Consulting ServicesPartial evidence	Covington, KY, United StatesHQ checked Sep 5, 2026	1,001-5,000	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, 2026
23	InotivPartial evidence	West Lafayette, IN, United StatesHQ checked Sep 5, 2026	1,001-5,000	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, 2026
24	Navitas Life SciencesPartial evidence	Gaithersburg, MD, United StatesHQ checked Sep 5, 2026	1,001-5,000	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, 2026
25	AllucentIndirect evidence	Cary, NC, United StatesHQ checked Sep 5, 2026	1,001-5,000	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, 2026

Showing 25 of 2,181 pharmaceutical research outsourcing based in the United States

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Pharmaceutical research outsourcing based in the United States at a glance

As of Sep 5, 2026

11-50Median size (employees)

San DiegoLargest hub · 64 HQs

59,085Contacts with mobile numbers

Sep 5, 2026Data refreshed

Companies by employee count

1-10

963

11-50

702

51-200

303

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Verified emails by last verification

0–30

81,833

31–60

5,457

61–90

90–180

180+

837

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 pharmaceutical research outsourcing, 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 “pharmaceutical research outsourcing”. 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 pharmaceutical research outsourcing, 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, 88,242 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.

Pharmaceutical research outsourcing by metro

Frequently asked

How many pharmaceutical research outsourcing are there based in the United States?

RevenueBase identified 2,181 pharmaceutical research outsourcing 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?

Labcorp, headquartered in Burlington, tops this list with the largest team on record.

Which city has the most pharmaceutical research outsourcing?

San Diego leads with 64 headquartered companies, followed by Boston (49) and New York (46).

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 88,242 verified decision-maker contacts tracked across these 2,181 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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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.