Company lists · Data refreshed September 2026

Top 25 Immunoassay companies based in the United States

Name: Immunoassay companies 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 1,359 companies tracked

RevenueBase identified 1,359 immunoassay companies headquartered in the United States as of September 2026 and tracks 165,828 professional contacts across them, including 79,188 with verified work emails. San Diego is the largest hub.

This list covers immunoassay companies 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

1,359Companies

165,828Contacts tracked

79,188Verified emails

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The 25 largest immunoassay companies based in the United States

Ranked by team size

Top 25 of 1,359 immunoassay companies 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 immunoassay companies: 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	Thermo Fisher Scientific	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 20, 2026	10001+	70,907 contacts →
	Indirect evidence “About Thermo Fisher Scientific Thermo Fisher Scientific Inc.” Source: RevenueBase Database · checked Sep 20, 2026
2	Beckman Coulter Diagnostics	Indirect evidence	Brea, CA, United StatesHQ checked Sep 20, 2026	10001+	10,069 contacts →
	Indirect evidence “A global leader in advanced diagnostics, Beckman Coulter has challenged convention to elevate the diagnostic laboratory’s role in improving patient health for more than 80 years.” Source: RevenueBase Database · checked Sep 20, 2026
3	Illumina	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 20, 2026	5,001-10,000	8,987 contacts →
	Indirect 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 20, 2026
4	Waters Corporation	Indirect evidence	Milford, MA, United StatesHQ checked Sep 20, 2026	10001+	8,189 contacts →
	Indirect evidence “Waters Corporation (NYSE: WAT) is a global leader in life sciences and diagnostics, dedicated to accelerating the benefits of pioneering science through analytical technologies…” Source: RevenueBase Database · checked Sep 20, 2026
5	Bio-Rad Laboratories	Indirect evidence	Hercules, CA, United StatesHQ checked Sep 20, 2026	5,001-10,000	8,149 contacts →
	Indirect evidence “Bio-Rad provides the healthcare industry with innovative and useful products that help life science researchers accelerate the discovery process and medical diagnostic labs obtain…” Source: RevenueBase Database · checked Sep 20, 2026
6	Cepheid	Indirect evidence	Sunnyvale, CA, United StatesHQ checked Sep 20, 2026	5,001-10,000	4,445 contacts →
	Indirect evidence “Cepheid is dedicated to improving healthcare by pioneering molecular diagnostics that combine speed, accuracy, and flexibility.” Source: RevenueBase Database · checked Sep 20, 2026
7	Revvity	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 20, 2026	10001+	2,938 contacts →
	Indirect evidence “At Revvity, “impossible” is inspiration, and ""can't be done"" is a call to action.” Source: RevenueBase Database · checked Sep 20, 2026
8	Myriad Genetics	Indirect evidence	Salt Lake City, UT, United StatesHQ checked Sep 20, 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 20, 2026
9	Bio-Techne	Indirect evidence	Minneapolis, MN, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,976 contacts →
	Indirect evidence “Bio-Techne is a global life sciences company that empowers scientific discovery and advances human health.” Source: RevenueBase Database · checked Sep 20, 2026
10	Werfen North America	Indirect evidence	Bedford, MA, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,908 contacts →
	Indirect evidence “Werfen is a growing, family-owned, innovative company founded in 1966 in Barcelona, Spain.” Source: RevenueBase Database · checked Sep 20, 2026
11	Promega Corporation	Indirect evidence	Madison, WI, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,727 contacts →
	Indirect evidence “At Promega Corporation, creativity and connection drive discovery and innovation.” Source: RevenueBase Database · checked Sep 20, 2026
12	Caris Life Sciences	Indirect evidence	Irving, TX, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,556 contacts →
	Indirect evidence “Caris Life Sciences® (Caris) is the leading next-generation TechBio company and precision medicine pioneer that is actively developing and delivering innovative solutions to…” Source: RevenueBase Database · checked Sep 20, 2026
13	Sysmex America, INC	Indirect evidence	Lincolnshire, IL, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,313 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026
14	Genscript	Indirect evidence	Piscataway, NJ, United StatesHQ checked Sep 20, 2026	5,001-10,000	1,194 contacts →
	Indirect evidence “GenScript Life Science Group is a part of GenScript Biotech Corporation.” Source: RevenueBase Database · checked Sep 20, 2026
15	Nova Biomedical	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,107 contacts →
	Indirect evidence “Nova Biomedical is entering a new chapter.” Source: RevenueBase Database · checked Sep 20, 2026
16	Meso Scale Diagnostics, LLC	Indirect evidence	Rockville, MD, United StatesHQ checked Sep 20, 2026	1,001-5,000	954 contacts →
	Indirect 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 20, 2026
17	Luminex	Indirect evidence	Austin, TX, United StatesHQ checked Sep 20, 2026	501-1,000	837 contacts →
	Indirect evidence “At Luminex, our mission is to empower labs to obtain reliable, timely, and actionable answers, ultimately advancing health.” Source: RevenueBase Database · checked Sep 20, 2026
18	Meridian Bioscience INC	Indirect evidence	Cincinnati, OH, United StatesHQ checked Sep 20, 2026	501-1,000	688 contacts →
	Indirect evidence “Meridian is a fully integrated life science company that develops, manufactures, markets and distributes a broad range of innovative diagnostic test kits, rare reagents, specialty…” Source: RevenueBase Database · checked Sep 20, 2026
19	Adaptive Biotechnologies Corp	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 20, 2026	501-1,000	678 contacts →
	Indirect 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
20	Cell Signaling Technology CST	Indirect evidence	Danvers, MA, United StatesHQ checked Sep 20, 2026	501-1,000	678 contacts →
	Indirect evidence “Founded by research scientists in Cell Signaling Technology (CST) is a private, family-owned company that prides itself on operating as a research institute developing quality…” Source: RevenueBase Database · checked Sep 20, 2026
21	Biolegend	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 20, 2026	501-1,000	670 contacts →
	Indirect evidence “At BioLegend, we are committed to providing researchers with the most comprehensive and cutting-edge high-quality reagents for life science research.” Source: RevenueBase Database · checked Sep 20, 2026
22	Biofire Diagnostics, LLC	Indirect evidence	Salt Lake City, UT, United StatesHQ checked Sep 20, 2026	1,001-5,000	633 contacts →
	Indirect evidence “With more than 25 years of molecular experience, BioFire Diagnostics, LLC (now bioMérieux) sets the standard for molecular diagnostics through its pioneering advances in syndromic…” Source: RevenueBase Database · checked Sep 20, 2026
23	Sdix LLC	Indirect evidence	Newark, DE, United StatesHQ checked Sep 20, 2026	51-200	559 contacts →
	Indirect evidence “SDIX, a wholly owned subsidiary of OriGene Technologies specializing in high quality, large-scale, GMP antibody production.” Source: RevenueBase Database · checked Sep 20, 2026
24	Hygiena	Indirect evidence	Camarillo, CA, United StatesHQ checked Sep 20, 2026	501-1,000	485 contacts →
	Indirect evidence “Hygiena delivers rapid microbial detection, monitoring, and identification solutions to a wide range of industries, including food and beverage, healthcare, hospitality…” Source: RevenueBase Database · checked Sep 20, 2026
25	Quanterix	Indirect evidence	Billerica, MA, United StatesHQ checked Sep 20, 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 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: immunoassay companies. 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 immunoassay companies.
Partial evidence: Its own public description names part of immunoassay companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name immunoassay companies. 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 1,359 immunoassay companies based in the United States

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Immunoassay companies based in the United States at a glance

As of Sep 20, 2026

47.8%Verified-email coverage

122.0Average contacts per company

11-50Median size (employees)

6.0%Largest-city concentration · San Diego

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

497

11-50

498

51-200

236

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 1,359 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 immunoassay companies, 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 “immunoassay companies”. 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 immunoassay companies), 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 immunoassay companies, 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, 79,188 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.

Immunoassay companies by metro

Immunoassay companies in San Diego81

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 immunoassay companies, 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 immunoassay companies are there based in the United States?

RevenueBase identified 1,359 immunoassay companies 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 immunoassay companies?

San Diego leads with 81 headquartered companies, followed by Irvine (20) and Boston (19).

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 79,188 verified decision-maker contacts tracked across these 1,359 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.