Company lists · Data refreshed September 2026

Top 25 Assay development service providers based in the United States

Name: Assay development service providers based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 463 companies tracked

RevenueBase identified 463 assay development service providers headquartered in the United States as of September 2026 and tracks 25,915 professional contacts across them, including 11,960 with verified work emails. San Diego is the largest hub.

This list covers assay development service 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 19, 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 19, 2026 86% judged on-target in blind review

463Companies

25,915Contacts tracked

11,960Verified emails

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The 25 largest assay development service providers based in the United States

Ranked by team size

Top 25 of 463 assay development service providers based in the United States, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to assay development service providers: 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	Illumina	Partial evidence	San Diego, CA, United StatesHQ checked Sep 19, 2026	5,001-10,000	8,987 contacts →
	Partial evidence “At Illumina, our goal is to apply innovative technologies and revolutionary assays to the analysis of genetic variation and function, making studies possible that were not even…” Source: RevenueBase Database · checked Sep 19, 2026
2	Myriad Genetics	Indirect evidence	Salt Lake City, UT, United StatesHQ checked Sep 19, 2026	1,001-5,000	2,718 contacts →
	Indirect evidence “Myriad Genetics is a leading molecular diagnostic testing and precision medicine company dedicated to advancing health and well-being for all.” Source: RevenueBase Database · checked Sep 19, 2026
3	Inotiv	Partial evidence	West Lafayette, IN, United StatesHQ checked Sep 19, 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 19, 2026
4	Meso Scale Diagnostics, LLC	Strong evidence	Rockville, MD, United StatesHQ checked Sep 19, 2026	1,001-5,000	954 contacts →
	Strong evidence “Founded in 1995, Meso Scale Discovery (MSD) is a global leader in the development, manufacture, and commercialization of innovative assays and instruments for the measurement of…” Source: RevenueBase Database · checked Sep 19, 2026
5	Bioagilytix	Partial evidence	Durham, NC, United StatesHQ checked Sep 19, 2026	1,001-5,000	915 contacts →
	Partial 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 19, 2026
6	Quanterix	Indirect evidence	Billerica, MA, United StatesHQ checked Sep 19, 2026	201-500	455 contacts →
	Indirect evidence “Quanterix is a company that is digitizing biomarker analysis with the goal of advancing the science of precision health.” Source: RevenueBase Database · checked Sep 19, 2026
7	Kcas BIO	Indirect evidence	Olathe, KS, United StatesHQ checked Sep 19, 2026	201-500	347 contacts →
	Indirect evidence “KCAS Bio is a top-tier contract research organization (CRO) that has 45 years of experience with both large pharma and biotech sponsors, providing comprehensive bioanalytical drug…” Source: RevenueBase Database · checked Sep 19, 2026
8	Personalis, INC	Indirect evidence	Fremont, CA, United StatesHQ checked Sep 19, 2026	201-500	325 contacts →
	Indirect evidence “At Personalis, we are transforming the active management of cancer through breakthrough personalized testing.” Source: RevenueBase Database · checked Sep 19, 2026
9	Cayman Chemical	Partial evidence	Ann Arbor, MI, United StatesHQ checked Sep 19, 2026	201-500	287 contacts →
	Partial evidence “Helping Make Research Possible We are helping make research possible by supplying scientists worldwide with the assay kits, antibodies, proteins, and biochemicals to advance their…” Source: RevenueBase Database · checked Sep 19, 2026
10	Watchmaker Genomics	Indirect evidence	Boulder, CO, United StatesHQ checked Sep 19, 2026	51-200	228 contacts →
	Indirect evidence “Watchmaker Genomics is a biotechnology company that specializes in advanced enzymology to develop precision tools for life sciences.” Source: RevenueBase Database · checked Sep 19, 2026
11	Champions Oncology, INC	Indirect evidence	Hackensack, NJ, United StatesHQ checked Sep 19, 2026	201-500	194 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
12	Biocytogen	Partial evidence	Waltham, MA, United StatesHQ checked Sep 19, 2026	1,001-5,000	188 contacts →
	Partial evidence “Biocytogen provides integrated solutions for next-generation antibody drug development to the global biomedical communities.” Source: RevenueBase Database · checked Sep 19, 2026
13	Invivoscribe	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 19, 2026	201-500	182 contacts →
	Indirect evidence “Invivoscribe® is a global leader dedicated to Improving Lives with Precision Diagnostics®, advancing the quality of healthcare by providing innovative products and clinical…” Source: RevenueBase Database · checked Sep 19, 2026
14	Hematogenix	Indirect evidence	Tinley Park, IL, United StatesHQ checked Sep 19, 2026	201-500	179 contacts →
	Indirect evidence “Hematogenix, a global cancer-focused life science company serving the pharmaceutical & biotechnology industry as well as community physicians.” Source: RevenueBase Database · checked Sep 19, 2026
15	Enzo Life Sciences, INC	Partial evidence	Farmingdale, NY, United StatesHQ checked Sep 19, 2026	51-200	166 contacts →
	Partial evidence “For more than 45 years, Enzo Biochem has been a leader in innovation and product development to support a diverse range of needs in biomedical research and healthcare.” Source: RevenueBase Database · checked Sep 19, 2026
16	Nautilus Biotechnology	Indirect evidence	San Carlos, WA, United StatesHQ checked Sep 19, 2026	51-200	155 contacts →
	Indirect evidence “Born from the founders’ recognition that their diverse but complementary skills and experiences would enable them to successfully address challenges that others had not, Nautilus…” Source: RevenueBase Database · checked Sep 19, 2026
17	Vector Laboratories, INC	Indirect evidence	Newark, CA, United StatesHQ checked Sep 19, 2026	201-500	140 contacts →
	Indirect evidence “Vector Laboratories serves and partners with scientists and industry teams developing the next generation of diagnostics, therapeutics, and biological insights.” Source: RevenueBase Database · checked Sep 19, 2026
18	Aliri Bioanalysis	Partial evidence	Colorado Springs, CO, United StatesHQ checked Sep 19, 2026	51-200	136 contacts →
	Partial evidence “Aliri is committed to solving industry challenges by bringing innovative bioanalysis and spatial solutions to biotech and pharma, as the complexity of the drug development…” Source: RevenueBase Database · checked Sep 19, 2026
19	Rules-Based Medicine, An Iqvia Business	Indirect evidence	Austin, TX, United StatesHQ checked Sep 19, 2026	51-200	131 contacts →
	Indirect evidence “Rules-Based Medicine (RBM), an IQVIA business, provides specialty immunoassay testing.” Source: RevenueBase Database · checked Sep 19, 2026
20	Immunologix Laboratories	Indirect evidence	Tampa, FL, United StatesHQ checked Sep 19, 2026	51-200	128 contacts →
	Indirect evidence “Immunologix Laboratories is a unique scientific partner, offering GLP and GCP compliant laboratory capabilities focused on ligand binding-based bioanalysis coupled with expert…” Source: RevenueBase Database · checked Sep 19, 2026
21	ATUM	Indirect evidence	Newark, CA, United StatesHQ checked Sep 19, 2026	51-200	122 contacts →
	Indirect evidence “ATUM is an industry-leading provider of life science tools and solutions.” Source: RevenueBase Database · checked Sep 19, 2026
22	Origene	Indirect evidence	Rockville, MD, United StatesHQ checked Sep 19, 2026	201-500	119 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
23	Eurofins Discoverx	Partial evidence	Fremont, CA, United StatesHQ checked Sep 19, 2026	51-200	116 contacts →
	Partial evidence “Eurofins DiscoverX, the products company of Eurofins Discovery, is committed to enabling and accelerating multi-modality drug discovery and development from discovery to QC lot…” Source: RevenueBase Database · checked Sep 19, 2026
24	BPS Bioscience INC	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 19, 2026	51-200	115 contacts →
	Indirect evidence “BPS Bioscience advances new scientific discoveries that lead to therapies by creating innovative solutions for research.” Source: RevenueBase Database · checked Sep 19, 2026
25	Fortis Life Sciences	Partial evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	201-500	112 contacts →
	Partial evidence “Fortis Life Sciences® partners with diagnostics and life sciences companies to design, validate, and manufacture solutions to solve their complex development problems.” Source: RevenueBase Database · checked Sep 19, 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: assay development service providers. 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 assay development service providers.
Partial evidence: Its own public description names part of assay development service providers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name assay development service providers. 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 463 assay development service providers based in the United States

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Assay development service providers based in the United States at a glance

As of Sep 19, 2026

46.2%Verified-email coverage

56.0Average contacts per company

11-50Median size (employees)

6.5%Largest-city concentration · San Diego

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

212

11-50

150

51-200

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 463 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 assay development service providers, 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 “assay development service providers”. 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 assay development service providers), 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 assay development service 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 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, 11,960 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 19, 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.

Assay development service providers by metro

Assay development service providers in San Diego30

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 assay development service providers, 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 assay development service providers are there based in the United States?

RevenueBase identified 463 assay development service 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?

Illumina, headquartered in San Diego, tops this list with the largest team on record.

Which city has the most assay development service providers?

San Diego leads with 30 headquartered companies, followed by Houston (9) and Boston (8).

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 11,960 verified decision-maker contacts tracked across these 463 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 19, 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.