Company lists · Data refreshed September 2026

Top 25 Assay development companies based in the United States

Name: Assay development 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 19, 2026 886 companies tracked

RevenueBase identified 886 assay development companies headquartered in the United States as of September 2026 and tracks 69,424 professional contacts across them, including 30,680 with verified work emails. San Diego is the largest hub.

This list covers assay development 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 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

886Companies

69,424Contacts tracked

30,680Verified emails

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The 25 largest assay development companies based in the United States

Ranked by team size

Top 25 of 886 assay development companies 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 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	Beckman Coulter Diagnostics	Indirect evidence	Brea, CA, United StatesHQ checked Sep 19, 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 19, 2026
2	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
3	Bio-Rad Laboratories	Indirect evidence	Hercules, CA, United StatesHQ checked Sep 19, 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 19, 2026
4	Cepheid	Indirect evidence	Sunnyvale, CA, United StatesHQ checked Sep 19, 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 19, 2026
5	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
6	Foundation Medicine	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,747 contacts →
	Indirect evidence “Foundation Medicine is a global, patient-focused precision medicine company delivering high-quality, transformative diagnostic solutions in cancer and other diseases.” Source: RevenueBase Database · checked Sep 19, 2026
7	Promega Corporation	Indirect evidence	Madison, WI, United StatesHQ checked Sep 19, 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 19, 2026
8	Caris Life Sciences	Indirect evidence	Irving, TX, United StatesHQ checked Sep 19, 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 19, 2026
9	Genscript	Indirect evidence	Piscataway, NJ, United StatesHQ checked Sep 19, 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 19, 2026
10	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
11	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
12	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
13	Luminex	Indirect evidence	Austin, TX, United StatesHQ checked Sep 19, 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 19, 2026
14	Billiontoone	Indirect evidence	Menlo Park, CA, United StatesHQ checked Sep 19, 2026	501-1,000	696 contacts →
	Indirect evidence “BillionToOne is a precision diagnostics company with the mission to make molecular diagnostics more accurate, efficient, and accessible.” Source: RevenueBase Database · checked Sep 19, 2026
15	Meridian Bioscience INC	Indirect evidence	Cincinnati, OH, United StatesHQ checked Sep 19, 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 19, 2026
16	Castle Biosciences, INC	Indirect evidence	Friendswood, TX, United StatesHQ checked Sep 19, 2026	501-1,000	682 contacts →
	Indirect evidence “Castle Biosciences (Nasdaq: CSTL) is a leading diagnostics company improving health through innovative tests that guide patient care.” Source: RevenueBase Database · checked Sep 19, 2026
17	Veracyte, INC	Indirect evidence	South San Francisco, CA, United StatesHQ checked Sep 19, 2026	501-1,000	675 contacts →
	Indirect evidence “Veracyte is a global diagnostics company that empowers clinicians with the high-value insights they need to guide and assure patients at pivotal moments in the race to diagnose…” Source: RevenueBase Database · checked Sep 19, 2026
18	Nitto Avecia	Indirect evidence	Milford, MA, United StatesHQ checked Sep 19, 2026	501-1,000	603 contacts →
	Indirect evidence “Oligonucleotides are giving rise to a new generation of therapeutics-and Nitto Avecia is helping lead the way.” Source: RevenueBase Database · checked Sep 19, 2026
19	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
20	Orasure Technologies, INC	Indirect evidence	Bethlehem, PA, United StatesHQ checked Sep 19, 2026	501-1,000	445 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
21	Sekisui Diagnostics	Indirect evidence	Burlington, MA, United StatesHQ checked Sep 19, 2026	201-500	424 contacts →
	Indirect evidence “Headquartered in Burlington, MA, for 40 years SEKISUI Diagnostics has been committed to helping improve the lives of patients by providing innovative medical diagnostics to…” Source: RevenueBase Database · checked Sep 19, 2026
22	Biodesix, INC	Indirect evidence	Louisville, CO, United StatesHQ checked Sep 19, 2026	201-500	361 contacts →
	Indirect evidence “Biodesix is a leading diagnostics solutions company, driven to improve clinical care and outcomes for patients.” Source: RevenueBase Database · checked Sep 19, 2026
23	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
24	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
25	Streck	Indirect evidence	La Vista, NE, United StatesHQ checked Sep 19, 2026	201-500	304 contacts →
	Indirect evidence “Established in 1971, Streck provides solutions that ensure every result counts by empowering clinical and research laboratories to reliably deliver accurate results, advance…” 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 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 assay development companies.
Partial evidence: Its own public description names part of assay development companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name assay development 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 886 assay development companies based in the United States

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Assay development companies based in the United States at a glance

As of Sep 19, 2026

44.2%Verified-email coverage

78.4Average contacts per company

11-50Median size (employees)

6.9%Largest-city concentration · San Diego

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

373

11-50

303

51-200

125

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 886 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 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 “assay development 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 assay development 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 assay development 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, 30,680 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 companies by metro

Assay development companies in San Diego61

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 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 assay development companies are there based in the United States?

RevenueBase identified 886 assay development 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?

Beckman Coulter Diagnostics, headquartered in Brea, tops this list with the largest team on record.

Which city has the most assay development companies?

San Diego leads with 61 headquartered companies, followed by Boston (19) and Irvine (16).

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 30,680 verified decision-maker contacts tracked across these 886 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.