Company lists · Data refreshed September 2026

Top 25 Immuno-oncology contract research organizations based in the Netherlands

RevenueBase identified 53 immuno-oncology contract research organizations headquartered in the Netherlands as of September 2026 and tracks 1,496 professional contacts across them, including 633 with verified work emails. Amsterdam is the largest hub.

This list covers immuno-oncology contract research organizations headquartered in the Netherlands, 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
53Companies
1,496Contacts tracked
633Verified emails
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The 25 largest immuno-oncology contract research organizations based in the Netherlands

Ranked by team size
Top 25 of 53 immuno-oncology contract research organizations based in the Netherlands, 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.
#CompanyRevenueBase Smart SearchHeadquartersEmployeesContacts
1Indirect evidenceLeiden, NetherlandsHQ checked Sep 20, 2026201-500367 contacts →

Indirect evidence

“The CRO for data-intensive, early phase clinical studies.”

Source: RevenueBase Database · checked Sep 20, 2026
2Strong evidenceZeist, NetherlandsHQ checked Sep 20, 2026201-500185 contacts →

Strong evidence

“P95 Julius Clinical is a global, science-led contract research organization (CRO) supporting clinical development from early-phase trials through late-phase and real-world…”

Source: RevenueBase Database · checked Sep 20, 2026
3Indirect evidenceRotterdam, NetherlandsHQ checked Sep 20, 2026201-500102 contacts →

Indirect evidence

“Viroclinics operates at a global level, being the preferred virology testing laboratory for several of the top-10 Biopharmaceutical companies.”

Source: RevenueBase Database · checked Sep 20, 2026
4Indirect evidenceArnhem, NetherlandsHQ checked Sep 20, 202651-20077 contacts →

Indirect evidence

“Qserve is a trusted global partner for MedTech Regulatory, Clinical, and Quality Compliance, as well as a full-service CRO for medical device clinical trials.”

Source: RevenueBase Database · checked Sep 20, 2026
5Indirect evidenceAmsterdam, NetherlandsHQ checked Sep 20, 202651-20059 contacts →

Indirect evidence

“Neogene Therapeutics is a global, clinical-stage biotechnology company pioneering the discovery, development, and manufacturing of next-generation engineered T cell receptor (TCR)…”

Source: RevenueBase Database · checked Sep 20, 2026
6Partial evidenceUtrecht, NetherlandsHQ checked Sep 20, 202611-5036 contacts →

Partial evidence

“Single Cell Discoveries is the leading single-cell sequencing CRO providing high-impact insights to biopharmaceutical companies, health systems, and academic research centers…”

Source: RevenueBase Database · checked Sep 20, 2026
7Indirect evidenceSchiphol-rijk, NetherlandsHQ checked Sep 20, 202651-20034 contacts →

Indirect evidence

Source: RevenueBase Database · checked Sep 20, 2026
8Strong evidenceMaarssen, NetherlandsHQ checked Sep 20, 202651-20022 contacts →

Strong evidence

“CR2O is a full-service Contract Research Organization.”

Source: RevenueBase Database · checked Sep 20, 2026
9Partial evidenceAmsterdam, NetherlandsHQ checked Sep 20, 202611-5019 contacts →

Partial evidence

“CureVac Netherlands BV is dedicated to transforming the treatment of cancer by directing the immune system towards Frame neoantigens.”

Source: RevenueBase Database · checked Sep 20, 2026
10Partial evidenceRotterdam, NetherlandsHQ checked Sep 20, 20261-1019 contacts →

Partial evidence

“Sairopa develops novel treatments for cancer by modulating the patient’s immune system.”

Source: RevenueBase Database · checked Sep 20, 2026
11Strong evidenceNijmegen, NetherlandsHQ checked Sep 20, 2026201-50019 contacts →

Strong evidence

“Symeres is the leading mid-sized European Contract Research Organization for your drug-discovery and development challenges.”

Source: RevenueBase Database · checked Sep 20, 2026
12Strong evidenceOss, NetherlandsHQ checked Sep 20, 202611-5018 contacts →

Strong evidence

“Oncolines B.V.(Oss, The Netherlands) is a precision medicine services company in oncology and cancer immunotherapy, part of Symeres B.V.(Nijmegen, The Netherlands).”

Source: RevenueBase Database · checked Sep 20, 2026
13Indirect evidenceRoosendaal, NetherlandsHQ checked Sep 20, 202611-5012 contacts →

Indirect evidence

“For 25 years, Siron Clinical has been a leading provider of flexible, high-quality CRO services across Europe, Israel, and Turkey.”

Source: RevenueBase Database · checked Sep 20, 2026
14Partial evidenceAmsterdam, NetherlandsHQ checked Sep 20, 20261-1012 contacts →

Partial evidence

“Tzu is an innovative biotechnology company dedicated to personalized oncology.”

Source: RevenueBase Database · checked Sep 20, 2026
15Indirect evidenceGroningen, NetherlandsHQ checked Sep 20, 202611-5011 contacts →

Indirect evidence

“Axon Medchem is a chemistry service platform, spinned-off from Axon Biochemicals BV.”

Source: RevenueBase Database · checked Sep 20, 2026
16Indirect evidenceDelft, NetherlandsHQ checked Sep 20, 202611-5010 contacts →

Indirect evidence

“Artemis Bioservices is a private, CRO specialized in vaccine and antiviral evaluation.”

Source: RevenueBase Database · checked Sep 20, 2026
17Indirect evidenceLeiden, NetherlandsHQ checked Sep 20, 20261-109 contacts →

Indirect evidence

“GBS Leiden is a GCLP- certified bioanalytical CRO specializing in biomarker and cell-based assay platforms to support mechanism-of-action, pharmacology and translational programs…”

Source: RevenueBase Database · checked Sep 20, 2026
18Partial evidenceUtrecht, NetherlandsHQ checked Sep 20, 202611-507 contacts →

Partial evidence

“U-Protein Express BV (an ImmunoPrecise Antibodies company) is your service provider for recombinant antibodies and proteins.”

Source: RevenueBase Database · checked Sep 20, 2026
19Indirect evidenceHoofddorp, NetherlandsHQ checked Sep 20, 202611-506 contacts →

Indirect evidence

“We’ve moved!”

Source: RevenueBase Database · checked Sep 20, 2026
20Indirect evidenceUtrecht, NetherlandsHQ checked Sep 20, 202611-505 contacts →

Indirect evidence

“Gadeta B.V, a Clade Therapeutics Inc.”

Source: RevenueBase Database · checked Sep 20, 2026
21Partial evidenceArnhem, NetherlandsHQ checked Sep 20, 20261-105 contacts →

Partial evidence

“a CRO that is specialized in Medical Devices and is small enough to care, but big enough to matter!” Applied Clinical Services BV is an Clinical Research Organization (CRO)…”

Source: RevenueBase Database · checked Sep 20, 2026
22Indirect evidenceMaastricht, NetherlandsHQ checked Sep 20, 20261-105 contacts →

Indirect evidence

“chiron is a pre-clinical CRO and platform company specializing in advanced, human-relevant in vitro models for translational drug discovery and development.”

Source: RevenueBase Database · checked Sep 20, 2026
23Indirect evidenceAmsterdam, NetherlandsHQ checked Sep 20, 20261-103 contacts →

Indirect evidence

“Medex15 offers medical and clinical expertise to pharmaceutical and biotech companies, and investigators.”

Source: RevenueBase Database · checked Sep 20, 2026
24Indirect evidenceMaastricht, NetherlandsHQ checked Sep 20, 20261-103 contacts →

Indirect evidence

“Our mission is achieving a better cure for cancer.”

Source: RevenueBase Database · checked Sep 20, 2026
25Partial evidenceThe Hague, NetherlandsHQ checked Sep 20, 20261-101 contacts →

Partial evidence

“ONKOS is an oncology-focused consultancy whose mission is to deliver cutting-edge insight and analysis in a competitive and complex environment.”

Source: RevenueBase Database · checked Sep 20, 2026

Showing 25 of 53 immuno-oncology contract research organizations based in the Netherlands

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

As of Sep 20, 2026
42.3%Verified-email coverage
28.2Average contacts per company
11-50Median size (employees)
9.4%Largest-city concentration · Amsterdam
Sep 20, 2026Page data refreshed

Companies by employee count

1-10
18
11-50
16
51-200
12
201-500
6
501-1,000
1

Email recency for this list is measured worldwide rather than for Netherlands, so it is reported there. Company counts and contact totals on this page are exact for Netherlands, over 53 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 Netherlands 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 Netherlands 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, 633 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.

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 Netherlands?

RevenueBase identified 53 immuno-oncology contract research organizations headquartered in the Netherlands 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?

Centre For Human Drug Research, headquartered in Netherlands, tops this list with the largest team on record.

Which city has the most immuno-oncology contract research organizations?

Amsterdam leads with 5 headquartered companies, followed by Rotterdam (4) and Maastricht (3).

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 633 verified decision-maker contacts tracked across these 53 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.