Company lists · Data refreshed September 2026

Top 25 Immuno-oncology contract research organizations based in the United States

Name: Immuno-oncology contract research organizations based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 1,235 companies tracked

RevenueBase identified 1,235 immuno-oncology contract research organizations headquartered in the United States as of September 2026 and tracks 139,683 professional contacts across them, including 63,639 with verified work emails. San Diego is the largest hub.

This list covers immuno-oncology contract research organizations 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 20, 2026.

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

1,235Companies

139,683Contacts tracked

63,639Verified emails

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The 25 largest immuno-oncology contract research organizations based in the United States

Ranked by team size

Top 25 of 1,235 immuno-oncology contract research organizations based in the United States, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to immuno-oncology contract research 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	PPD	Partial evidence	Waltham, MA, United StatesHQ checked Sep 20, 2026	10001+	20,530 contacts →
	Partial 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
2	Parexel	Partial evidence	Raleigh, NC, United StatesHQ checked Sep 20, 2026	10001+	19,257 contacts →
	Partial 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 20, 2026
3	Fortrea	Partial evidence	Research Triangle Park, NC, United StatesHQ checked Sep 20, 2026	10001+	10,632 contacts →
	Partial 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	Strong evidence	Cincinnati, OH, United StatesHQ checked Sep 20, 2026	5,001-10,000	5,960 contacts →
	Strong 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	Covance	Indirect evidence	Princeton, NJ, United StatesHQ checked Sep 20, 2026	10001+	5,220 contacts →
	Indirect evidence “As the drug development business of Laboratory Corporation of America Holdings (Labcorp) and the world’s most comprehensive drug development #CRO service company, we have helped…” Source: RevenueBase Database · checked Sep 20, 2026
6	PRA Health Sciences	Indirect evidence	Raleigh, NC, United StatesHQ checked Sep 20, 2026	10001+	4,708 contacts →
	Indirect evidence “PRA is now an ICON plc company.” Source: RevenueBase Database · checked Sep 20, 2026
7	Kite Pharma	Indirect evidence	Santa Monica, CA, United StatesHQ checked Sep 20, 2026	1,001-5,000	3,766 contacts →
	Indirect evidence “At Kite, a Gilead Company, our singular focus is achieving cures with cell therapy.” Source: RevenueBase Database · checked Sep 20, 2026
8	Worldwide Clinical Trials	Indirect evidence	Research Triangle Park, NC, United StatesHQ checked Sep 20, 2026	1,001-5,000	3,440 contacts →
	Indirect 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 20, 2026
9	Premier Research	Partial evidence	Morrisville, NC, United StatesHQ checked Sep 20, 2026	1,001-5,000	2,584 contacts →
	Partial 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 20, 2026
10	Precision For Medicine	Partial evidence	Bethesda, MD, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,781 contacts →
	Partial 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 20, 2026
11	Neogenomics Laboratories	Indirect evidence	Fort Myers, FL, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,678 contacts →
	Indirect evidence “Our vision: A world where every cancer treatment decision is as personal as the patient.” Source: RevenueBase Database · checked Sep 20, 2026
12	CYTEL	Indirect evidence	Cambridge, MA, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,580 contacts →
	Indirect 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 20, 2026
13	Clinchoice	Indirect evidence	Horsham, PA, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,516 contacts →
	Indirect evidence “ClinChoice is a leading global full & functional service CRO, renowned for its exceptional product development and lifecycle management capabilities across the pharmaceutical…” Source: RevenueBase Database · checked Sep 20, 2026
14	NAMSA	Strong evidence	Toledo, OH, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,275 contacts →
	Strong evidence “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: RevenueBase Database · checked Sep 20, 2026
15	Celerion	Partial evidence	Lincoln, NE, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,080 contacts →
	Partial evidence “Celerion, a leader in early clinical research, delivers Applied Translational Medicine.” Source: RevenueBase Database · checked Sep 20, 2026
16	CTI Clinical Trial And Consulting Services	Partial evidence	Covington, KY, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,043 contacts →
	Partial 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
17	Inotiv	Partial evidence	West Lafayette, IN, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,015 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 20, 2026
18	EMMES	Strong evidence	Rockville, MD, United StatesHQ checked Sep 20, 2026	1,001-5,000	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 20, 2026
19	Bioagilytix	Strong evidence	Durham, NC, United StatesHQ checked Sep 20, 2026	1,001-5,000	915 contacts →
	Strong 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
20	MMS	Partial evidence	Canton, MI, United StatesHQ checked Sep 20, 2026	501-1,000	876 contacts →
	Partial 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
21	Sarah Cannon Research Institute	Strong evidence	Nashville, TN, United StatesHQ checked Sep 20, 2026	501-1,000	868 contacts →
	Strong evidence “Sarah Cannon Research Institute (SCRI) is one of the world’s leading oncology research organizations, conducting community-based clinical trials.” Source: RevenueBase Database · checked Sep 20, 2026
22	Caidya	Partial evidence	Raleigh, NC, United StatesHQ checked Sep 20, 2026	1,001-5,000	758 contacts →
	Partial evidence “Caidya is a multi-therapeutic clinical research organization (CRO) serving innovators worldwide.” Source: RevenueBase Database · checked Sep 20, 2026
23	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
24	Frontage Laboratories, INC	Strong evidence	Exton, PA, United StatesHQ checked Sep 20, 2026	1,001-5,000	727 contacts →
	Strong evidence “Frontage Laboratories is a US-based Contract Research Organization (CRO) that was initially established in New Jersey in April 2001 and later relocated to Pennsylvania in 2004.” Source: RevenueBase Database · checked Sep 20, 2026
25	Adaptive Biotechnologies Corp	Partial evidence	Seattle, WA, United StatesHQ checked Sep 20, 2026	501-1,000	678 contacts →
	Partial evidence “Adaptive Biotechnologies is a pioneer and leader in immune-driven medicine that aims to improve people’s lives by learning from the wisdom of their adaptive immune systems.” 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: immuno-oncology contract research 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 immuno-oncology contract research organizations.
Partial evidence: Its own public description names part of immuno-oncology contract research organizations, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name immuno-oncology contract research 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 1,235 immuno-oncology contract research organizations based in the United States

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Immuno-oncology contract research organizations based in the United States at a glance

As of Sep 20, 2026

45.6%Verified-email coverage

113.1Average contacts per company

11-50Median size (employees)

5.0%Largest-city concentration · San Diego

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

420

11-50

449

51-200

216

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 1,235 companies.

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 immuno-oncology contract research 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.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “immuno-oncology contract research 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 immuno-oncology contract research 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 immuno-oncology contract research organizations, 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 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, 63,639 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.

Immuno-oncology contract research organizations by metro

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 immuno-oncology contract research 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 immuno-oncology contract research organizations are there based in the United States?

RevenueBase identified 1,235 immuno-oncology contract research organizations 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 immuno-oncology contract research organizations?

San Diego leads with 62 headquartered companies, followed by Cambridge (42) and New York (35).

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 63,639 verified decision-maker contacts tracked across these 1,235 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.